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 58static void 59sctp_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 */ 85static void 86sctp_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 parameters */ 102 init = &cp->init; 103 if ((ntohl(init->initiate_tag) == 0) || 104 (ntohl(init->a_rwnd) < SCTP_MIN_RWND) || 105 (ntohs(init->num_inbound_streams) == 0) || 106 (ntohs(init->num_outbound_streams) == 0)) { 107 /* protocol error... send abort */ 108 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 109 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 110 mflowtype, mflowid, 111 vrf_id, port); 112 if (stcb) 113 *abort_no_unlock = 1; 114 goto outnow; 115 } 116 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 117 offset + ntohs(cp->ch.chunk_length))) { 118 /* auth parameter(s) error... send abort */ 119 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 120 "Problem with AUTH parameters"); 121 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 122 mflowtype, mflowid, 123 vrf_id, port); 124 if (stcb) 125 *abort_no_unlock = 1; 126 goto outnow; 127 } 128 /* We are only accepting if we have a listening socket. */ 129 if ((stcb == NULL) && 130 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 131 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 132 (!SCTP_IS_LISTENING(inp)))) { 133 /* 134 * FIX ME ?? What about TCP model and we have a 135 * match/restart case? Actually no fix is needed. the lookup 136 * will always find the existing assoc so stcb would not be 137 * NULL. It may be questionable to do this since we COULD 138 * just send back the INIT-ACK and hope that the app did 139 * accept()'s by the time the COOKIE was sent. But there is 140 * a price to pay for COOKIE generation and I don't want to 141 * pay it on the chance that the app will actually do some 142 * accepts(). The App just looses and should NOT be in this 143 * state :-) 144 */ 145 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) { 146 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 147 "No listener"); 148 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 149 mflowtype, mflowid, inp->fibnum, 150 vrf_id, port); 151 } 152 goto outnow; 153 } 154 if ((stcb != NULL) && 155 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT)) { 156 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n"); 157 sctp_send_shutdown_ack(stcb, NULL); 158 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 159 } else { 160 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 161 sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset, 162 src, dst, sh, cp, 163 mflowtype, mflowid, 164 vrf_id, port); 165 } 166outnow: 167 if (stcb == NULL) { 168 SCTP_INP_RUNLOCK(inp); 169 } 170} 171 172/* 173 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 174 */ 175 176int 177sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked) 178{ 179 int unsent_data; 180 unsigned int i; 181 struct sctp_stream_queue_pending *sp; 182 struct sctp_association *asoc; 183 184 /* 185 * This function returns if any stream has true unsent data on it. 186 * Note that as it looks through it will clean up any places that 187 * have old data that has been sent but left at top of stream queue. 188 */ 189 asoc = &stcb->asoc; 190 unsent_data = 0; 191 SCTP_TCB_SEND_LOCK(stcb); 192 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 193 /* Check to see if some data queued */ 194 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 195 /* sa_ignore FREED_MEMORY */ 196 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); 197 if (sp == NULL) { 198 continue; 199 } 200 if ((sp->msg_is_complete) && 201 (sp->length == 0) && 202 (sp->sender_all_done)) { 203 /* 204 * We are doing differed cleanup. Last time 205 * through when we took all the data the 206 * sender_all_done was not set. 207 */ 208 if (sp->put_last_out == 0) { 209 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 210 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 211 sp->sender_all_done, 212 sp->length, 213 sp->msg_is_complete, 214 sp->put_last_out); 215 } 216 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 217 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); 218 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp, 1); 219 if (sp->net) { 220 sctp_free_remote_addr(sp->net); 221 sp->net = NULL; 222 } 223 if (sp->data) { 224 sctp_m_freem(sp->data); 225 sp->data = NULL; 226 } 227 sctp_free_a_strmoq(stcb, sp, so_locked); 228 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) { 229 unsent_data++; 230 } 231 } else { 232 unsent_data++; 233 } 234 if (unsent_data > 0) { 235 break; 236 } 237 } 238 } 239 SCTP_TCB_SEND_UNLOCK(stcb); 240 return (unsent_data); 241} 242 243static int 244sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb) 245{ 246 struct sctp_init *init; 247 struct sctp_association *asoc; 248 struct sctp_nets *lnet; 249 unsigned int i; 250 251 init = &cp->init; 252 asoc = &stcb->asoc; 253 /* save off parameters */ 254 asoc->peer_vtag = ntohl(init->initiate_tag); 255 asoc->peers_rwnd = ntohl(init->a_rwnd); 256 /* init tsn's */ 257 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 258 259 if (!TAILQ_EMPTY(&asoc->nets)) { 260 /* update any ssthresh's that may have a default */ 261 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 262 lnet->ssthresh = asoc->peers_rwnd; 263 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 264 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 265 } 266 } 267 } 268 SCTP_TCB_SEND_LOCK(stcb); 269 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 270 unsigned int newcnt; 271 struct sctp_stream_out *outs; 272 struct sctp_stream_queue_pending *sp, *nsp; 273 struct sctp_tmit_chunk *chk, *nchk; 274 275 /* abandon the upper streams */ 276 newcnt = ntohs(init->num_inbound_streams); 277 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 278 if (chk->rec.data.sid >= newcnt) { 279 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 280 asoc->send_queue_cnt--; 281 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) { 282 asoc->strmout[chk->rec.data.sid].chunks_on_queues--; 283#ifdef INVARIANTS 284 } else { 285 panic("No chunks on the queues for sid %u.", chk->rec.data.sid); 286#endif 287 } 288 if (chk->data != NULL) { 289 sctp_free_bufspace(stcb, asoc, chk, 1); 290 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb, 291 0, chk, SCTP_SO_NOT_LOCKED); 292 if (chk->data) { 293 sctp_m_freem(chk->data); 294 chk->data = NULL; 295 } 296 } 297 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 298 /* sa_ignore FREED_MEMORY */ 299 } 300 } 301 if (asoc->strmout) { 302 for (i = newcnt; i < asoc->pre_open_streams; i++) { 303 outs = &asoc->strmout[i]; 304 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 305 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 306 TAILQ_REMOVE(&outs->outqueue, sp, next); 307 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp, 1); 308 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 309 stcb, 0, sp, SCTP_SO_NOT_LOCKED); 310 if (sp->data) { 311 sctp_m_freem(sp->data); 312 sp->data = NULL; 313 } 314 if (sp->net) { 315 sctp_free_remote_addr(sp->net); 316 sp->net = NULL; 317 } 318 /* Free the chunk */ 319 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 320 /* sa_ignore FREED_MEMORY */ 321 } 322 outs->state = SCTP_STREAM_CLOSED; 323 } 324 } 325 /* cut back the count */ 326 asoc->pre_open_streams = newcnt; 327 } 328 SCTP_TCB_SEND_UNLOCK(stcb); 329 asoc->streamoutcnt = asoc->pre_open_streams; 330 if (asoc->strmout) { 331 for (i = 0; i < asoc->streamoutcnt; i++) { 332 asoc->strmout[i].state = SCTP_STREAM_OPEN; 333 } 334 } 335 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 336 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 337 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 338 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 339 } 340 /* This is the next one we expect */ 341 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 342 343 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 344 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 345 346 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 347 /* open the requested streams */ 348 349 if (asoc->strmin != NULL) { 350 /* Free the old ones */ 351 for (i = 0; i < asoc->streamincnt; i++) { 352 sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue); 353 sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue); 354 } 355 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 356 } 357 if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) { 358 asoc->streamincnt = ntohs(init->num_outbound_streams); 359 } else { 360 asoc->streamincnt = asoc->max_inbound_streams; 361 } 362 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 363 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 364 if (asoc->strmin == NULL) { 365 /* we didn't get memory for the streams! */ 366 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 367 return (-1); 368 } 369 for (i = 0; i < asoc->streamincnt; i++) { 370 asoc->strmin[i].sid = i; 371 asoc->strmin[i].last_mid_delivered = 0xffffffff; 372 TAILQ_INIT(&asoc->strmin[i].inqueue); 373 TAILQ_INIT(&asoc->strmin[i].uno_inqueue); 374 asoc->strmin[i].pd_api_started = 0; 375 asoc->strmin[i].delivery_started = 0; 376 } 377 /* 378 * load_address_from_init will put the addresses into the 379 * association when the COOKIE is processed or the INIT-ACK is 380 * processed. Both types of COOKIE's existing and new call this 381 * routine. It will remove addresses that are no longer in the 382 * association (for the restarting case where addresses are 383 * removed). Up front when the INIT arrives we will discard it if it 384 * is a restart and new addresses have been added. 385 */ 386 /* sa_ignore MEMLEAK */ 387 return (0); 388} 389 390/* 391 * INIT-ACK message processing/consumption returns value < 0 on error 392 */ 393static int 394sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 395 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 396 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 397 struct sctp_nets *net, int *abort_no_unlock, 398 uint8_t mflowtype, uint32_t mflowid, 399 uint32_t vrf_id) 400{ 401 struct sctp_association *asoc; 402 struct mbuf *op_err; 403 int retval, abort_flag, cookie_found; 404 int initack_limit; 405 int nat_friendly = 0; 406 407 /* First verify that we have no illegal param's */ 408 abort_flag = 0; 409 cookie_found = 0; 410 411 op_err = sctp_arethere_unrecognized_parameters(m, 412 (offset + sizeof(struct sctp_init_chunk)), 413 &abort_flag, (struct sctp_chunkhdr *)cp, 414 &nat_friendly, &cookie_found); 415 if (abort_flag) { 416 /* Send an abort and notify peer */ 417 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 418 *abort_no_unlock = 1; 419 return (-1); 420 } 421 if (!cookie_found) { 422 uint16_t len; 423 424 /* Only report the missing cookie parameter */ 425 if (op_err != NULL) { 426 sctp_m_freem(op_err); 427 } 428 len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t)); 429 /* We abort with an error of missing mandatory param */ 430 op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA); 431 if (op_err != NULL) { 432 struct sctp_error_missing_param *cause; 433 434 SCTP_BUF_LEN(op_err) = len; 435 cause = mtod(op_err, struct sctp_error_missing_param *); 436 /* Subtract the reserved param */ 437 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM); 438 cause->cause.length = htons(len); 439 cause->num_missing_params = htonl(1); 440 cause->type[0] = htons(SCTP_STATE_COOKIE); 441 } 442 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 443 src, dst, sh, op_err, 444 mflowtype, mflowid, 445 vrf_id, net->port); 446 *abort_no_unlock = 1; 447 return (-3); 448 } 449 asoc = &stcb->asoc; 450 asoc->peer_supports_nat = (uint8_t)nat_friendly; 451 /* process the peer's parameters in the INIT-ACK */ 452 if (sctp_process_init((struct sctp_init_chunk *)cp, stcb) < 0) { 453 if (op_err != NULL) { 454 sctp_m_freem(op_err); 455 } 456 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 457 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n"); 458 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 459 src, dst, sh, op_err, 460 mflowtype, mflowid, 461 vrf_id, net->port); 462 *abort_no_unlock = 1; 463 return (-1); 464 } 465 initack_limit = offset + ntohs(cp->ch.chunk_length); 466 /* load all addresses */ 467 if ((retval = sctp_load_addresses_from_init(stcb, m, 468 offset + sizeof(struct sctp_init_chunk), 469 initack_limit, src, dst, NULL, stcb->asoc.port)) < 0) { 470 if (op_err != NULL) { 471 sctp_m_freem(op_err); 472 } 473 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 474 "Problem with address parameters"); 475 SCTPDBG(SCTP_DEBUG_INPUT1, 476 "Load addresses from INIT causes an abort %d\n", 477 retval); 478 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 479 src, dst, sh, op_err, 480 mflowtype, mflowid, 481 vrf_id, net->port); 482 *abort_no_unlock = 1; 483 return (-1); 484 } 485 /* if the peer doesn't support asconf, flush the asconf queue */ 486 if (asoc->asconf_supported == 0) { 487 struct sctp_asconf_addr *param, *nparam; 488 489 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 490 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 491 SCTP_FREE(param, SCTP_M_ASC_ADDR); 492 } 493 } 494 495 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 496 stcb->asoc.local_hmacs); 497 if (op_err) { 498 sctp_queue_op_err(stcb, op_err); 499 /* queuing will steal away the mbuf chain to the out queue */ 500 op_err = NULL; 501 } 502 /* extract the cookie and queue it to "echo" it back... */ 503 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 504 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 505 stcb->asoc.overall_error_count, 506 0, 507 SCTP_FROM_SCTP_INPUT, 508 __LINE__); 509 } 510 stcb->asoc.overall_error_count = 0; 511 net->error_count = 0; 512 513 /* 514 * Cancel the INIT timer, We do this first before queueing the 515 * cookie. We always cancel at the primary to assue that we are 516 * canceling the timer started by the INIT which always goes to the 517 * primary. 518 */ 519 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 520 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 521 522 /* calculate the RTO */ 523 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 524 SCTP_RTT_FROM_NON_DATA); 525 retval = sctp_send_cookie_echo(m, offset, initack_limit, stcb, net); 526 return (retval); 527} 528 529static void 530sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 531 struct sctp_tcb *stcb, struct sctp_nets *net) 532{ 533 union sctp_sockstore store; 534 struct sctp_nets *r_net, *f_net; 535 struct timeval tv; 536 int req_prim = 0; 537 uint16_t old_error_counter; 538 539 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 540 /* Invalid length */ 541 return; 542 } 543 544 memset(&store, 0, sizeof(store)); 545 switch (cp->heartbeat.hb_info.addr_family) { 546#ifdef INET 547 case AF_INET: 548 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 549 store.sin.sin_family = cp->heartbeat.hb_info.addr_family; 550 store.sin.sin_len = cp->heartbeat.hb_info.addr_len; 551 store.sin.sin_port = stcb->rport; 552 memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address, 553 sizeof(store.sin.sin_addr)); 554 } else { 555 return; 556 } 557 break; 558#endif 559#ifdef INET6 560 case AF_INET6: 561 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 562 store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family; 563 store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len; 564 store.sin6.sin6_port = stcb->rport; 565 memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr)); 566 } else { 567 return; 568 } 569 break; 570#endif 571 default: 572 return; 573 } 574 r_net = sctp_findnet(stcb, &store.sa); 575 if (r_net == NULL) { 576 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 577 return; 578 } 579 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 580 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 581 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 582 /* 583 * If the its a HB and it's random value is correct when can 584 * confirm the destination. 585 */ 586 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 587 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 588 stcb->asoc.primary_destination = r_net; 589 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 590 f_net = TAILQ_FIRST(&stcb->asoc.nets); 591 if (f_net != r_net) { 592 /* 593 * first one on the list is NOT the primary 594 * sctp_cmpaddr() is much more efficient if 595 * the primary is the first on the list, 596 * make it so. 597 */ 598 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 599 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 600 } 601 req_prim = 1; 602 } 603 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 604 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 605 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, 606 r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 607 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 608 } 609 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 610 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 611 stcb->asoc.overall_error_count, 612 0, 613 SCTP_FROM_SCTP_INPUT, 614 __LINE__); 615 } 616 stcb->asoc.overall_error_count = 0; 617 old_error_counter = r_net->error_count; 618 r_net->error_count = 0; 619 r_net->hb_responded = 1; 620 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 621 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 622 /* Now lets do a RTO with this */ 623 sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, 624 SCTP_RTT_FROM_NON_DATA); 625 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 626 r_net->dest_state |= SCTP_ADDR_REACHABLE; 627 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 628 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 629 } 630 if (r_net->dest_state & SCTP_ADDR_PF) { 631 r_net->dest_state &= ~SCTP_ADDR_PF; 632 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 633 } 634 if (old_error_counter > 0) { 635 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 636 stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 637 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 638 } 639 if (r_net == stcb->asoc.primary_destination) { 640 if (stcb->asoc.alternate) { 641 /* release the alternate, primary is good */ 642 sctp_free_remote_addr(stcb->asoc.alternate); 643 stcb->asoc.alternate = NULL; 644 } 645 } 646 /* Mobility adaptation */ 647 if (req_prim) { 648 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 649 SCTP_MOBILITY_BASE) || 650 sctp_is_mobility_feature_on(stcb->sctp_ep, 651 SCTP_MOBILITY_FASTHANDOFF)) && 652 sctp_is_mobility_feature_on(stcb->sctp_ep, 653 SCTP_MOBILITY_PRIM_DELETED)) { 654 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, 655 stcb->sctp_ep, stcb, NULL, 656 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 657 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 658 SCTP_MOBILITY_FASTHANDOFF)) { 659 sctp_assoc_immediate_retrans(stcb, 660 stcb->asoc.primary_destination); 661 } 662 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 663 SCTP_MOBILITY_BASE)) { 664 sctp_move_chunks_from_net(stcb, 665 stcb->asoc.deleted_primary); 666 } 667 sctp_delete_prim_timer(stcb->sctp_ep, stcb); 668 } 669 } 670} 671 672static int 673sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 674{ 675 /* 676 * Return 0 means we want you to proceed with the abort non-zero 677 * means no abort processing. 678 */ 679 uint32_t new_vtag; 680 struct sctpasochead *head; 681 682 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 683 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 684 new_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 685 atomic_add_int(&stcb->asoc.refcnt, 1); 686 SCTP_TCB_UNLOCK(stcb); 687 SCTP_INP_INFO_WLOCK(); 688 SCTP_TCB_LOCK(stcb); 689 atomic_subtract_int(&stcb->asoc.refcnt, 1); 690 } else { 691 return (0); 692 } 693 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) { 694 /* generate a new vtag and send init */ 695 LIST_REMOVE(stcb, sctp_asocs); 696 stcb->asoc.my_vtag = new_vtag; 697 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 698 /* 699 * put it in the bucket in the vtag hash of assoc's for the 700 * system 701 */ 702 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 703 SCTP_INP_INFO_WUNLOCK(); 704 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 705 return (1); 706 } else { 707 /* 708 * treat like a case where the cookie expired i.e.: - dump 709 * current cookie. - generate a new vtag. - resend init. 710 */ 711 /* generate a new vtag and send init */ 712 LIST_REMOVE(stcb, sctp_asocs); 713 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 714 sctp_stop_all_cookie_timers(stcb); 715 sctp_toss_old_cookies(stcb, &stcb->asoc); 716 stcb->asoc.my_vtag = new_vtag; 717 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 718 /* 719 * put it in the bucket in the vtag hash of assoc's for the 720 * system 721 */ 722 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 723 SCTP_INP_INFO_WUNLOCK(); 724 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 725 return (1); 726 } 727 return (0); 728} 729 730static int 731sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 732 struct sctp_nets *net) 733{ 734 /* 735 * return 0 means we want you to proceed with the abort non-zero 736 * means no abort processing 737 */ 738 if (stcb->asoc.auth_supported == 0) { 739 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 740 return (0); 741 } 742 sctp_asconf_send_nat_state_update(stcb, net); 743 return (1); 744} 745 746/* Returns 1 if the stcb was aborted, 0 otherwise */ 747static int 748sctp_handle_abort(struct sctp_abort_chunk *abort, 749 struct sctp_tcb *stcb, struct sctp_nets *net) 750{ 751 uint16_t len; 752 uint16_t error; 753 754 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 755 if (stcb == NULL) 756 return (0); 757 758 len = ntohs(abort->ch.chunk_length); 759 if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) { 760 /* 761 * Need to check the cause codes for our two magic nat 762 * aborts which don't kill the assoc necessarily. 763 */ 764 struct sctp_error_cause *cause; 765 766 cause = (struct sctp_error_cause *)(abort + 1); 767 error = ntohs(cause->code); 768 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 769 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ABORT flags:%x\n", 770 abort->ch.chunk_flags); 771 if (sctp_handle_nat_colliding_state(stcb)) { 772 return (0); 773 } 774 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 775 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ABORT flags:%x\n", 776 abort->ch.chunk_flags); 777 if (sctp_handle_nat_missing_state(stcb, net)) { 778 return (0); 779 } 780 } 781 } else { 782 error = 0; 783 } 784 /* stop any receive timers */ 785 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL, 786 SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); 787 /* notify user of the abort and clean up... */ 788 sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED); 789 /* free the tcb */ 790 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 791 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || 792 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 793 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 794 } 795#ifdef SCTP_ASOCLOG_OF_TSNS 796 sctp_print_out_track_log(stcb); 797#endif 798 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 799 SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 800 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 801 return (1); 802} 803 804static void 805sctp_start_net_timers(struct sctp_tcb *stcb) 806{ 807 uint32_t cnt_hb_sent; 808 struct sctp_nets *net; 809 810 cnt_hb_sent = 0; 811 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 812 /* 813 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 814 * If the dest in unconfirmed send a hb as well if under 815 * max_hb_burst have been sent. 816 */ 817 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 818 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 819 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 820 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 821 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 822 cnt_hb_sent++; 823 } 824 } 825 if (cnt_hb_sent) { 826 sctp_chunk_output(stcb->sctp_ep, stcb, 827 SCTP_OUTPUT_FROM_COOKIE_ACK, 828 SCTP_SO_NOT_LOCKED); 829 } 830} 831 832static void 833sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 834 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 835{ 836 struct sctp_association *asoc; 837 int some_on_streamwheel; 838 int old_state; 839 840 SCTPDBG(SCTP_DEBUG_INPUT2, 841 "sctp_handle_shutdown: handling SHUTDOWN\n"); 842 if (stcb == NULL) 843 return; 844 asoc = &stcb->asoc; 845 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 846 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 847 return; 848 } 849 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 850 /* Shutdown NOT the expected size */ 851 return; 852 } 853 old_state = SCTP_GET_STATE(stcb); 854 sctp_update_acked(stcb, cp, abort_flag); 855 if (*abort_flag) { 856 return; 857 } 858 if (asoc->control_pdapi) { 859 /* 860 * With a normal shutdown we assume the end of last record. 861 */ 862 SCTP_INP_READ_LOCK(stcb->sctp_ep); 863 if (asoc->control_pdapi->on_strm_q) { 864 struct sctp_stream_in *strm; 865 866 strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream]; 867 if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) { 868 /* Unordered */ 869 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm); 870 asoc->control_pdapi->on_strm_q = 0; 871 } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) { 872 /* Ordered */ 873 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm); 874 asoc->control_pdapi->on_strm_q = 0; 875#ifdef INVARIANTS 876 } else { 877 panic("Unknown state on ctrl:%p on_strm_q:%d", 878 asoc->control_pdapi, 879 asoc->control_pdapi->on_strm_q); 880#endif 881 } 882 } 883 asoc->control_pdapi->end_added = 1; 884 asoc->control_pdapi->pdapi_aborted = 1; 885 asoc->control_pdapi = NULL; 886 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 887 if (stcb->sctp_socket) { 888 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 889 } 890 } 891 /* goto SHUTDOWN_RECEIVED state to block new requests */ 892 if (stcb->sctp_socket) { 893 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 894 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 895 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 896 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_RECEIVED); 897 /* 898 * notify upper layer that peer has initiated a 899 * shutdown 900 */ 901 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 902 903 /* reset time */ 904 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 905 } 906 } 907 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) { 908 /* 909 * stop the shutdown timer, since we WILL move to 910 * SHUTDOWN-ACK-SENT. 911 */ 912 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, 913 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 914 } 915 /* Now is there unsent data on a stream somewhere? */ 916 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 917 918 if (!TAILQ_EMPTY(&asoc->send_queue) || 919 !TAILQ_EMPTY(&asoc->sent_queue) || 920 some_on_streamwheel) { 921 /* By returning we will push more data out */ 922 return; 923 } else { 924 /* no outstanding data to send, so move on... */ 925 /* send SHUTDOWN-ACK */ 926 /* move to SHUTDOWN-ACK-SENT state */ 927 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || 928 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 929 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 930 } 931 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 932 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_ACK_SENT); 933 sctp_stop_timers_for_shutdown(stcb); 934 sctp_send_shutdown_ack(stcb, net); 935 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 936 stcb->sctp_ep, stcb, net); 937 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) { 938 sctp_send_shutdown_ack(stcb, net); 939 } 940 } 941} 942 943static void 944sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 945 struct sctp_tcb *stcb, 946 struct sctp_nets *net) 947{ 948 struct sctp_association *asoc; 949 950 SCTPDBG(SCTP_DEBUG_INPUT2, 951 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 952 if (stcb == NULL) 953 return; 954 955 asoc = &stcb->asoc; 956 /* process according to association state */ 957 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 958 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 959 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 960 sctp_send_shutdown_complete(stcb, net, 1); 961 SCTP_TCB_UNLOCK(stcb); 962 return; 963 } 964 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) && 965 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 966 /* unexpected SHUTDOWN-ACK... so ignore... */ 967 SCTP_TCB_UNLOCK(stcb); 968 return; 969 } 970 if (asoc->control_pdapi) { 971 /* 972 * With a normal shutdown we assume the end of last record. 973 */ 974 SCTP_INP_READ_LOCK(stcb->sctp_ep); 975 asoc->control_pdapi->end_added = 1; 976 asoc->control_pdapi->pdapi_aborted = 1; 977 asoc->control_pdapi = NULL; 978 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 979 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 980 } 981#ifdef INVARIANTS 982 if (!TAILQ_EMPTY(&asoc->send_queue) || 983 !TAILQ_EMPTY(&asoc->sent_queue) || 984 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 985 panic("Queues are not empty when handling SHUTDOWN-ACK"); 986 } 987#endif 988 /* stop the timer */ 989 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, 990 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 991 /* send SHUTDOWN-COMPLETE */ 992 sctp_send_shutdown_complete(stcb, net, 0); 993 /* notify upper layer protocol */ 994 if (stcb->sctp_socket) { 995 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 996 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 997 stcb->sctp_socket->so_snd.sb_cc = 0; 998 } 999 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1000 } 1001 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1002 /* free the TCB but first save off the ep */ 1003 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1004 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1005} 1006 1007static void 1008sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type) 1009{ 1010 switch (chunk_type) { 1011 case SCTP_ASCONF_ACK: 1012 case SCTP_ASCONF: 1013 sctp_asconf_cleanup(stcb); 1014 break; 1015 case SCTP_IFORWARD_CUM_TSN: 1016 case SCTP_FORWARD_CUM_TSN: 1017 stcb->asoc.prsctp_supported = 0; 1018 break; 1019 default: 1020 SCTPDBG(SCTP_DEBUG_INPUT2, 1021 "Peer does not support chunk type %d (0x%x).\n", 1022 chunk_type, chunk_type); 1023 break; 1024 } 1025} 1026 1027/* 1028 * Skip past the param header and then we will find the param that caused the 1029 * problem. There are a number of param's in a ASCONF OR the prsctp param 1030 * these will turn of specific features. 1031 * XXX: Is this the right thing to do? 1032 */ 1033static void 1034sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type) 1035{ 1036 switch (parameter_type) { 1037 /* pr-sctp draft */ 1038 case SCTP_PRSCTP_SUPPORTED: 1039 stcb->asoc.prsctp_supported = 0; 1040 break; 1041 case SCTP_SUPPORTED_CHUNK_EXT: 1042 break; 1043 /* draft-ietf-tsvwg-addip-sctp */ 1044 case SCTP_HAS_NAT_SUPPORT: 1045 stcb->asoc.peer_supports_nat = 0; 1046 break; 1047 case SCTP_ADD_IP_ADDRESS: 1048 case SCTP_DEL_IP_ADDRESS: 1049 case SCTP_SET_PRIM_ADDR: 1050 stcb->asoc.asconf_supported = 0; 1051 break; 1052 case SCTP_SUCCESS_REPORT: 1053 case SCTP_ERROR_CAUSE_IND: 1054 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1055 SCTPDBG(SCTP_DEBUG_INPUT2, 1056 "Turning off ASCONF to this strange peer\n"); 1057 stcb->asoc.asconf_supported = 0; 1058 break; 1059 default: 1060 SCTPDBG(SCTP_DEBUG_INPUT2, 1061 "Peer does not support param type %d (0x%x)??\n", 1062 parameter_type, parameter_type); 1063 break; 1064 } 1065} 1066 1067static int 1068sctp_handle_error(struct sctp_chunkhdr *ch, 1069 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 1070{ 1071 struct sctp_error_cause *cause; 1072 struct sctp_association *asoc; 1073 uint32_t remaining_length, adjust; 1074 uint16_t code, cause_code, cause_length; 1075 1076 /* parse through all of the errors and process */ 1077 asoc = &stcb->asoc; 1078 cause = (struct sctp_error_cause *)((caddr_t)ch + 1079 sizeof(struct sctp_chunkhdr)); 1080 remaining_length = ntohs(ch->chunk_length); 1081 if (remaining_length > limit) { 1082 remaining_length = limit; 1083 } 1084 if (remaining_length >= sizeof(struct sctp_chunkhdr)) { 1085 remaining_length -= sizeof(struct sctp_chunkhdr); 1086 } else { 1087 remaining_length = 0; 1088 } 1089 code = 0; 1090 while (remaining_length >= sizeof(struct sctp_error_cause)) { 1091 /* Process an Error Cause */ 1092 cause_code = ntohs(cause->code); 1093 cause_length = ntohs(cause->length); 1094 if ((cause_length > remaining_length) || (cause_length == 0)) { 1095 /* Invalid cause length, possibly due to truncation. */ 1096 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n", 1097 remaining_length, cause_length); 1098 return (0); 1099 } 1100 if (code == 0) { 1101 /* report the first error cause */ 1102 code = cause_code; 1103 } 1104 switch (cause_code) { 1105 case SCTP_CAUSE_INVALID_STREAM: 1106 case SCTP_CAUSE_MISSING_PARAM: 1107 case SCTP_CAUSE_INVALID_PARAM: 1108 case SCTP_CAUSE_NO_USER_DATA: 1109 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n", 1110 cause_code); 1111 break; 1112 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1113 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ERROR flags: %x\n", 1114 ch->chunk_flags); 1115 if (sctp_handle_nat_colliding_state(stcb)) { 1116 return (0); 1117 } 1118 break; 1119 case SCTP_CAUSE_NAT_MISSING_STATE: 1120 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ERROR flags: %x\n", 1121 ch->chunk_flags); 1122 if (sctp_handle_nat_missing_state(stcb, net)) { 1123 return (0); 1124 } 1125 break; 1126 case SCTP_CAUSE_STALE_COOKIE: 1127 /* 1128 * We only act if we have echoed a cookie and are 1129 * waiting. 1130 */ 1131 if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) && 1132 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1133 struct sctp_error_stale_cookie *stale_cookie; 1134 1135 stale_cookie = (struct sctp_error_stale_cookie *)cause; 1136 /* stable_time is in usec, convert to msec. */ 1137 asoc->cookie_preserve_req = ntohl(stale_cookie->stale_time) / 1000; 1138 /* Double it to be more robust on RTX. */ 1139 asoc->cookie_preserve_req *= 2; 1140 asoc->stale_cookie_count++; 1141 if (asoc->stale_cookie_count > 1142 asoc->max_init_times) { 1143 sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED); 1144 /* now free the asoc */ 1145 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1146 SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1147 return (-1); 1148 } 1149 /* blast back to INIT state */ 1150 sctp_toss_old_cookies(stcb, &stcb->asoc); 1151 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 1152 sctp_stop_all_cookie_timers(stcb); 1153 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1154 } 1155 break; 1156 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1157 /* 1158 * Nothing we can do here, we don't do hostname 1159 * addresses so if the peer does not like my IPv6 1160 * (or IPv4 for that matter) it does not matter. If 1161 * they don't support that type of address, they can 1162 * NOT possibly get that packet type... i.e. with no 1163 * IPv6 you can't receive a IPv6 packet. so we can 1164 * safely ignore this one. If we ever added support 1165 * for HOSTNAME Addresses, then we would need to do 1166 * something here. 1167 */ 1168 break; 1169 case SCTP_CAUSE_UNRECOG_CHUNK: 1170 if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) { 1171 struct sctp_error_unrecognized_chunk *unrec_chunk; 1172 1173 unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause; 1174 sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type); 1175 } 1176 break; 1177 case SCTP_CAUSE_UNRECOG_PARAM: 1178 /* XXX: We only consider the first parameter */ 1179 if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) { 1180 struct sctp_paramhdr *unrec_parameter; 1181 1182 unrec_parameter = (struct sctp_paramhdr *)(cause + 1); 1183 sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type)); 1184 } 1185 break; 1186 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1187 /* 1188 * We ignore this since the timer will drive out a 1189 * new cookie anyway and there timer will drive us 1190 * to send a SHUTDOWN_COMPLETE. We can't send one 1191 * here since we don't have their tag. 1192 */ 1193 break; 1194 case SCTP_CAUSE_DELETING_LAST_ADDR: 1195 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1196 case SCTP_CAUSE_DELETING_SRC_ADDR: 1197 /* 1198 * We should NOT get these here, but in a 1199 * ASCONF-ACK. 1200 */ 1201 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n", 1202 cause_code); 1203 break; 1204 case SCTP_CAUSE_OUT_OF_RESC: 1205 /* 1206 * And what, pray tell do we do with the fact that 1207 * the peer is out of resources? Not really sure we 1208 * could do anything but abort. I suspect this 1209 * should have came WITH an abort instead of in a 1210 * OP-ERROR. 1211 */ 1212 break; 1213 default: 1214 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n", 1215 cause_code); 1216 break; 1217 } 1218 adjust = SCTP_SIZE32(cause_length); 1219 if (remaining_length >= adjust) { 1220 remaining_length -= adjust; 1221 } else { 1222 remaining_length = 0; 1223 } 1224 cause = (struct sctp_error_cause *)((caddr_t)cause + adjust); 1225 } 1226 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED); 1227 return (0); 1228} 1229 1230static int 1231sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1232 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1233 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1234 struct sctp_nets *net, int *abort_no_unlock, 1235 uint8_t mflowtype, uint32_t mflowid, 1236 uint32_t vrf_id) 1237{ 1238 struct sctp_init_ack *init_ack; 1239 struct mbuf *op_err; 1240 1241 SCTPDBG(SCTP_DEBUG_INPUT2, 1242 "sctp_handle_init_ack: handling INIT-ACK\n"); 1243 1244 if (stcb == NULL) { 1245 SCTPDBG(SCTP_DEBUG_INPUT2, 1246 "sctp_handle_init_ack: TCB is null\n"); 1247 return (-1); 1248 } 1249 init_ack = &cp->init; 1250 /* Validate parameters. */ 1251 if ((ntohl(init_ack->initiate_tag) == 0) || 1252 (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) || 1253 (ntohs(init_ack->num_inbound_streams) == 0) || 1254 (ntohs(init_ack->num_outbound_streams) == 0)) { 1255 /* protocol error... send an abort */ 1256 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1257 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1258 src, dst, sh, op_err, 1259 mflowtype, mflowid, 1260 vrf_id, net->port); 1261 *abort_no_unlock = 1; 1262 return (-1); 1263 } 1264 /* process according to association state... */ 1265 switch (SCTP_GET_STATE(stcb)) { 1266 case SCTP_STATE_COOKIE_WAIT: 1267 /* this is the expected state for this chunk */ 1268 /* process the INIT-ACK parameters */ 1269 if (stcb->asoc.primary_destination->dest_state & 1270 SCTP_ADDR_UNCONFIRMED) { 1271 /* 1272 * The primary is where we sent the INIT, we can 1273 * always consider it confirmed when the INIT-ACK is 1274 * returned. Do this before we load addresses 1275 * though. 1276 */ 1277 stcb->asoc.primary_destination->dest_state &= 1278 ~SCTP_ADDR_UNCONFIRMED; 1279 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1280 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1281 } 1282 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1283 net, abort_no_unlock, 1284 mflowtype, mflowid, 1285 vrf_id) < 0) { 1286 /* error in parsing parameters */ 1287 return (-1); 1288 } 1289 /* update our state */ 1290 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1291 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_ECHOED); 1292 1293 /* reset the RTO calc */ 1294 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1295 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1296 stcb->asoc.overall_error_count, 1297 0, 1298 SCTP_FROM_SCTP_INPUT, 1299 __LINE__); 1300 } 1301 stcb->asoc.overall_error_count = 0; 1302 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1303 /* 1304 * collapse the init timer back in case of a exponential 1305 * backoff 1306 */ 1307 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1308 stcb, net); 1309 /* 1310 * the send at the end of the inbound data processing will 1311 * cause the cookie to be sent 1312 */ 1313 break; 1314 case SCTP_STATE_SHUTDOWN_SENT: 1315 /* incorrect state... discard */ 1316 break; 1317 case SCTP_STATE_COOKIE_ECHOED: 1318 /* incorrect state... discard */ 1319 break; 1320 case SCTP_STATE_OPEN: 1321 /* incorrect state... discard */ 1322 break; 1323 case SCTP_STATE_EMPTY: 1324 case SCTP_STATE_INUSE: 1325 default: 1326 /* incorrect state... discard */ 1327 return (-1); 1328 break; 1329 } 1330 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1331 return (0); 1332} 1333 1334static struct sctp_tcb * 1335sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1336 struct sockaddr *src, struct sockaddr *dst, 1337 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1338 struct sctp_inpcb *inp, struct sctp_nets **netp, 1339 struct sockaddr *init_src, int *notification, 1340 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1341 uint8_t mflowtype, uint32_t mflowid, 1342 uint32_t vrf_id, uint16_t port); 1343 1344/* 1345 * handle a state cookie for an existing association m: input packet mbuf 1346 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1347 * "split" mbuf and the cookie signature does not exist offset: offset into 1348 * mbuf to the cookie-echo chunk 1349 */ 1350static struct sctp_tcb * 1351sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1352 struct sockaddr *src, struct sockaddr *dst, 1353 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1354 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1355 struct sockaddr *init_src, int *notification, 1356 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1357 uint8_t mflowtype, uint32_t mflowid, 1358 uint32_t vrf_id, uint16_t port) 1359{ 1360 struct sctp_association *asoc; 1361 struct sctp_init_chunk *init_cp, init_buf; 1362 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1363 struct sctp_asconf_addr *aparam, *naparam; 1364 struct sctp_asconf_ack *aack, *naack; 1365 struct sctp_tmit_chunk *chk, *nchk; 1366 struct sctp_stream_reset_list *strrst, *nstrrst; 1367 struct sctp_queued_to_read *sq, *nsq; 1368 struct sctp_nets *net; 1369 struct mbuf *op_err; 1370 struct timeval old; 1371 int init_offset, initack_offset, i; 1372 int retval; 1373 int spec_flag = 0; 1374 uint32_t how_indx; 1375#if defined(SCTP_DETAILED_STR_STATS) 1376 int j; 1377#endif 1378 1379 net = *netp; 1380 /* I know that the TCB is non-NULL from the caller */ 1381 asoc = &stcb->asoc; 1382 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1383 if (asoc->cookie_how[how_indx] == 0) 1384 break; 1385 } 1386 if (how_indx < sizeof(asoc->cookie_how)) { 1387 asoc->cookie_how[how_indx] = 1; 1388 } 1389 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1390 /* SHUTDOWN came in after sending INIT-ACK */ 1391 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1392 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, ""); 1393 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1394 mflowtype, mflowid, inp->fibnum, 1395 vrf_id, net->port); 1396 if (how_indx < sizeof(asoc->cookie_how)) 1397 asoc->cookie_how[how_indx] = 2; 1398 SCTP_TCB_UNLOCK(stcb); 1399 return (NULL); 1400 } 1401 /* 1402 * find and validate the INIT chunk in the cookie (peer's info) the 1403 * INIT should start after the cookie-echo header struct (chunk 1404 * header, state cookie header struct) 1405 */ 1406 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1407 1408 init_cp = (struct sctp_init_chunk *) 1409 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1410 (uint8_t *)&init_buf); 1411 if (init_cp == NULL) { 1412 /* could not pull a INIT chunk in cookie */ 1413 SCTP_TCB_UNLOCK(stcb); 1414 return (NULL); 1415 } 1416 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1417 SCTP_TCB_UNLOCK(stcb); 1418 return (NULL); 1419 } 1420 /* 1421 * find and validate the INIT-ACK chunk in the cookie (my info) the 1422 * INIT-ACK follows the INIT chunk 1423 */ 1424 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1425 initack_cp = (struct sctp_init_ack_chunk *) 1426 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1427 (uint8_t *)&initack_buf); 1428 if (initack_cp == NULL) { 1429 /* could not pull INIT-ACK chunk in cookie */ 1430 SCTP_TCB_UNLOCK(stcb); 1431 return (NULL); 1432 } 1433 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1434 SCTP_TCB_UNLOCK(stcb); 1435 return (NULL); 1436 } 1437 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1438 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1439 /* 1440 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1441 * to get into the OPEN state 1442 */ 1443 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1444 /*- 1445 * Opps, this means that we somehow generated two vtag's 1446 * the same. I.e. we did: 1447 * Us Peer 1448 * <---INIT(tag=a)------ 1449 * ----INIT-ACK(tag=t)--> 1450 * ----INIT(tag=t)------> *1 1451 * <---INIT-ACK(tag=a)--- 1452 * <----CE(tag=t)------------- *2 1453 * 1454 * At point *1 we should be generating a different 1455 * tag t'. Which means we would throw away the CE and send 1456 * ours instead. Basically this is case C (throw away side). 1457 */ 1458 if (how_indx < sizeof(asoc->cookie_how)) 1459 asoc->cookie_how[how_indx] = 17; 1460 SCTP_TCB_UNLOCK(stcb); 1461 return (NULL); 1462 } 1463 switch (SCTP_GET_STATE(stcb)) { 1464 case SCTP_STATE_COOKIE_WAIT: 1465 case SCTP_STATE_COOKIE_ECHOED: 1466 /* 1467 * INIT was sent but got a COOKIE_ECHO with the 1468 * correct tags... just accept it...but we must 1469 * process the init so that we can make sure we have 1470 * the right seq no's. 1471 */ 1472 /* First we must process the INIT !! */ 1473 if (sctp_process_init(init_cp, stcb) < 0) { 1474 if (how_indx < sizeof(asoc->cookie_how)) 1475 asoc->cookie_how[how_indx] = 3; 1476 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 1477 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n"); 1478 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1479 src, dst, sh, op_err, 1480 mflowtype, mflowid, 1481 vrf_id, net->port); 1482 return (NULL); 1483 } 1484 /* we have already processed the INIT so no problem */ 1485 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, 1486 stcb, net, 1487 SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1488 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, 1489 stcb, net, 1490 SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1491 /* update current state */ 1492 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1493 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1494 else 1495 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1496 1497 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1498 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1499 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1500 stcb->sctp_ep, stcb, NULL); 1501 } 1502 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1503 sctp_stop_all_cookie_timers(stcb); 1504 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1505 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1506 (!SCTP_IS_LISTENING(inp))) { 1507 /* 1508 * Here is where collision would go if we 1509 * did a connect() and instead got a 1510 * init/init-ack/cookie done before the 1511 * init-ack came back.. 1512 */ 1513 stcb->sctp_ep->sctp_flags |= 1514 SCTP_PCB_FLAGS_CONNECTED; 1515 soisconnected(stcb->sctp_socket); 1516 } 1517 /* notify upper layer */ 1518 *notification = SCTP_NOTIFY_ASSOC_UP; 1519 /* 1520 * since we did not send a HB make sure we don't 1521 * double things 1522 */ 1523 old.tv_sec = cookie->time_entered.tv_sec; 1524 old.tv_usec = cookie->time_entered.tv_usec; 1525 net->hb_responded = 1; 1526 sctp_calculate_rto(stcb, asoc, net, &old, 1527 SCTP_RTT_FROM_NON_DATA); 1528 1529 if (stcb->asoc.sctp_autoclose_ticks && 1530 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1531 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1532 inp, stcb, NULL); 1533 } 1534 break; 1535 default: 1536 /* 1537 * we're in the OPEN state (or beyond), so peer must 1538 * have simply lost the COOKIE-ACK 1539 */ 1540 break; 1541 } /* end switch */ 1542 sctp_stop_all_cookie_timers(stcb); 1543 if ((retval = sctp_load_addresses_from_init(stcb, m, 1544 init_offset + sizeof(struct sctp_init_chunk), 1545 initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) { 1546 if (how_indx < sizeof(asoc->cookie_how)) 1547 asoc->cookie_how[how_indx] = 4; 1548 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 1549 "Problem with address parameters"); 1550 SCTPDBG(SCTP_DEBUG_INPUT1, 1551 "Load addresses from INIT causes an abort %d\n", 1552 retval); 1553 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1554 src, dst, sh, op_err, 1555 mflowtype, mflowid, 1556 vrf_id, net->port); 1557 return (NULL); 1558 } 1559 /* respond with a COOKIE-ACK */ 1560 sctp_toss_old_cookies(stcb, asoc); 1561 sctp_send_cookie_ack(stcb); 1562 if (how_indx < sizeof(asoc->cookie_how)) 1563 asoc->cookie_how[how_indx] = 5; 1564 return (stcb); 1565 } 1566 1567 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1568 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1569 cookie->tie_tag_my_vtag == 0 && 1570 cookie->tie_tag_peer_vtag == 0) { 1571 /* 1572 * case C in Section 5.2.4 Table 2: XMOO silently discard 1573 */ 1574 if (how_indx < sizeof(asoc->cookie_how)) 1575 asoc->cookie_how[how_indx] = 6; 1576 SCTP_TCB_UNLOCK(stcb); 1577 return (NULL); 1578 } 1579 /* 1580 * If nat support, and the below and stcb is established, send back 1581 * a ABORT(colliding state) if we are established. 1582 */ 1583 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) && 1584 (asoc->peer_supports_nat) && 1585 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1586 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1587 (asoc->peer_vtag == 0)))) { 1588 /* 1589 * Special case - Peer's support nat. We may have two init's 1590 * that we gave out the same tag on since one was not 1591 * established.. i.e. we get INIT from host-1 behind the nat 1592 * and we respond tag-a, we get a INIT from host-2 behind 1593 * the nat and we get tag-a again. Then we bring up host-1 1594 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1595 * Now we have colliding state. We must send an abort here 1596 * with colliding state indication. 1597 */ 1598 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, ""); 1599 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1600 mflowtype, mflowid, inp->fibnum, 1601 vrf_id, port); 1602 SCTP_TCB_UNLOCK(stcb); 1603 return (NULL); 1604 } 1605 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1606 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1607 (asoc->peer_vtag == 0))) { 1608 /* 1609 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1610 * should be ok, re-accept peer info 1611 */ 1612 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1613 /* 1614 * Extension of case C. If we hit this, then the 1615 * random number generator returned the same vtag 1616 * when we first sent our INIT-ACK and when we later 1617 * sent our INIT. The side with the seq numbers that 1618 * are different will be the one that normnally 1619 * would have hit case C. This in effect "extends" 1620 * our vtags in this collision case to be 64 bits. 1621 * The same collision could occur aka you get both 1622 * vtag and seq number the same twice in a row.. but 1623 * is much less likely. If it did happen then we 1624 * would proceed through and bring up the assoc.. we 1625 * may end up with the wrong stream setup however.. 1626 * which would be bad.. but there is no way to 1627 * tell.. until we send on a stream that does not 1628 * exist :-) 1629 */ 1630 if (how_indx < sizeof(asoc->cookie_how)) 1631 asoc->cookie_how[how_indx] = 7; 1632 1633 SCTP_TCB_UNLOCK(stcb); 1634 return (NULL); 1635 } 1636 if (how_indx < sizeof(asoc->cookie_how)) 1637 asoc->cookie_how[how_indx] = 8; 1638 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1639 SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1640 sctp_stop_all_cookie_timers(stcb); 1641 /* 1642 * since we did not send a HB make sure we don't double 1643 * things 1644 */ 1645 net->hb_responded = 1; 1646 if (stcb->asoc.sctp_autoclose_ticks && 1647 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1648 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1649 NULL); 1650 } 1651 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1652 if (asoc->pre_open_streams < asoc->streamoutcnt) { 1653 asoc->pre_open_streams = asoc->streamoutcnt; 1654 } 1655 1656 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1657 /* 1658 * Ok the peer probably discarded our data (if we 1659 * echoed a cookie+data). So anything on the 1660 * sent_queue should be marked for retransmit, we 1661 * may not get something to kick us so it COULD 1662 * still take a timeout to move these.. but it can't 1663 * hurt to mark them. 1664 */ 1665 1666 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1667 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1668 chk->sent = SCTP_DATAGRAM_RESEND; 1669 sctp_flight_size_decrease(chk); 1670 sctp_total_flight_decrease(stcb, chk); 1671 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1672 spec_flag++; 1673 } 1674 } 1675 } 1676 /* process the INIT info (peer's info) */ 1677 if (sctp_process_init(init_cp, stcb) < 0) { 1678 if (how_indx < sizeof(asoc->cookie_how)) 1679 asoc->cookie_how[how_indx] = 9; 1680 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 1681 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n"); 1682 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1683 src, dst, sh, op_err, 1684 mflowtype, mflowid, 1685 vrf_id, net->port); 1686 return (NULL); 1687 } 1688 if ((retval = sctp_load_addresses_from_init(stcb, m, 1689 init_offset + sizeof(struct sctp_init_chunk), 1690 initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) { 1691 if (how_indx < sizeof(asoc->cookie_how)) 1692 asoc->cookie_how[how_indx] = 10; 1693 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 1694 "Problem with address parameters"); 1695 SCTPDBG(SCTP_DEBUG_INPUT1, 1696 "Load addresses from INIT causes an abort %d\n", 1697 retval); 1698 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1699 src, dst, sh, op_err, 1700 mflowtype, mflowid, 1701 vrf_id, net->port); 1702 return (NULL); 1703 } 1704 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 1705 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1706 *notification = SCTP_NOTIFY_ASSOC_UP; 1707 1708 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1709 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1710 (!SCTP_IS_LISTENING(inp))) { 1711 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 1712 soisconnected(stcb->sctp_socket); 1713 } 1714 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1715 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1716 else 1717 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1718 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1719 } else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1720 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1721 } else { 1722 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1723 } 1724 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1725 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1726 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1727 stcb->sctp_ep, stcb, NULL); 1728 } 1729 sctp_stop_all_cookie_timers(stcb); 1730 sctp_toss_old_cookies(stcb, asoc); 1731 sctp_send_cookie_ack(stcb); 1732 if (spec_flag) { 1733 /* 1734 * only if we have retrans set do we do this. What 1735 * this call does is get only the COOKIE-ACK out and 1736 * then when we return the normal call to 1737 * sctp_chunk_output will get the retrans out behind 1738 * this. 1739 */ 1740 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1741 } 1742 if (how_indx < sizeof(asoc->cookie_how)) 1743 asoc->cookie_how[how_indx] = 11; 1744 1745 return (stcb); 1746 } 1747 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1748 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1749 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1750 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1751 cookie->tie_tag_peer_vtag != 0) { 1752 struct sctpasochead *head; 1753 1754 if (asoc->peer_supports_nat) { 1755 struct sctp_tcb *local_stcb; 1756 1757 /* 1758 * This is a gross gross hack. Just call the 1759 * cookie_new code since we are allowing a duplicate 1760 * association. I hope this works... 1761 */ 1762 local_stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, 1763 sh, cookie, cookie_len, 1764 inp, netp, init_src, notification, 1765 auth_skipped, auth_offset, auth_len, 1766 mflowtype, mflowid, 1767 vrf_id, port); 1768 if (local_stcb == NULL) { 1769 SCTP_TCB_UNLOCK(stcb); 1770 } 1771 return (local_stcb); 1772 } 1773 /* 1774 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1775 */ 1776 /* temp code */ 1777 if (how_indx < sizeof(asoc->cookie_how)) 1778 asoc->cookie_how[how_indx] = 12; 1779 sctp_stop_association_timers(stcb, false); 1780 /* notify upper layer */ 1781 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1782 atomic_add_int(&stcb->asoc.refcnt, 1); 1783 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) && 1784 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1785 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 1786 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1787 } 1788 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1789 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1790 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1791 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1792 } 1793 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1794 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1795 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1796 stcb->sctp_ep, stcb, NULL); 1797 1798 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1799 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1800 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1801 } 1802 if (asoc->pre_open_streams < asoc->streamoutcnt) { 1803 asoc->pre_open_streams = asoc->streamoutcnt; 1804 } 1805 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1806 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1807 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1808 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1809 asoc->str_reset_seq_in = asoc->init_seq_number; 1810 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1811 asoc->send_sack = 1; 1812 asoc->data_pkts_seen = 0; 1813 asoc->last_data_chunk_from = NULL; 1814 asoc->last_control_chunk_from = NULL; 1815 asoc->last_net_cmt_send_started = NULL; 1816 if (asoc->mapping_array) { 1817 memset(asoc->mapping_array, 0, 1818 asoc->mapping_array_size); 1819 } 1820 if (asoc->nr_mapping_array) { 1821 memset(asoc->nr_mapping_array, 0, 1822 asoc->mapping_array_size); 1823 } 1824 SCTP_TCB_UNLOCK(stcb); 1825 SCTP_INP_INFO_WLOCK(); 1826 SCTP_INP_WLOCK(stcb->sctp_ep); 1827 SCTP_TCB_LOCK(stcb); 1828 atomic_add_int(&stcb->asoc.refcnt, -1); 1829 /* send up all the data */ 1830 SCTP_TCB_SEND_LOCK(stcb); 1831 1832 sctp_report_all_outbound(stcb, 0, SCTP_SO_LOCKED); 1833 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1834 stcb->asoc.strmout[i].chunks_on_queues = 0; 1835#if defined(SCTP_DETAILED_STR_STATS) 1836 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) { 1837 asoc->strmout[i].abandoned_sent[j] = 0; 1838 asoc->strmout[i].abandoned_unsent[j] = 0; 1839 } 1840#else 1841 asoc->strmout[i].abandoned_sent[0] = 0; 1842 asoc->strmout[i].abandoned_unsent[0] = 0; 1843#endif 1844 stcb->asoc.strmout[i].next_mid_ordered = 0; 1845 stcb->asoc.strmout[i].next_mid_unordered = 0; 1846 stcb->asoc.strmout[i].sid = i; 1847 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1848 } 1849 TAILQ_FOREACH_SAFE(strrst, &asoc->resetHead, next_resp, nstrrst) { 1850 TAILQ_REMOVE(&asoc->resetHead, strrst, next_resp); 1851 SCTP_FREE(strrst, SCTP_M_STRESET); 1852 } 1853 TAILQ_FOREACH_SAFE(sq, &asoc->pending_reply_queue, next, nsq) { 1854 TAILQ_REMOVE(&asoc->pending_reply_queue, sq, next); 1855 if (sq->data) { 1856 sctp_m_freem(sq->data); 1857 sq->data = NULL; 1858 } 1859 sctp_free_remote_addr(sq->whoFrom); 1860 sq->whoFrom = NULL; 1861 sq->stcb = NULL; 1862 sctp_free_a_readq(stcb, sq); 1863 } 1864 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) { 1865 TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next); 1866 if (chk->data) { 1867 sctp_m_freem(chk->data); 1868 chk->data = NULL; 1869 } 1870 if (chk->holds_key_ref) 1871 sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED); 1872 sctp_free_remote_addr(chk->whoTo); 1873 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk); 1874 SCTP_DECR_CHK_COUNT(); 1875 } 1876 asoc->ctrl_queue_cnt = 0; 1877 asoc->str_reset = NULL; 1878 asoc->stream_reset_outstanding = 0; 1879 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) { 1880 TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next); 1881 if (chk->data) { 1882 sctp_m_freem(chk->data); 1883 chk->data = NULL; 1884 } 1885 if (chk->holds_key_ref) 1886 sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED); 1887 sctp_free_remote_addr(chk->whoTo); 1888 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk); 1889 SCTP_DECR_CHK_COUNT(); 1890 } 1891 TAILQ_FOREACH_SAFE(aparam, &asoc->asconf_queue, next, naparam) { 1892 TAILQ_REMOVE(&asoc->asconf_queue, aparam, next); 1893 SCTP_FREE(aparam, SCTP_M_ASC_ADDR); 1894 } 1895 TAILQ_FOREACH_SAFE(aack, &asoc->asconf_ack_sent, next, naack) { 1896 TAILQ_REMOVE(&asoc->asconf_ack_sent, aack, next); 1897 if (aack->data != NULL) { 1898 sctp_m_freem(aack->data); 1899 } 1900 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_asconf_ack), aack); 1901 } 1902 1903 /* process the INIT-ACK info (my info) */ 1904 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1905 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1906 1907 /* pull from vtag hash */ 1908 LIST_REMOVE(stcb, sctp_asocs); 1909 /* re-insert to new vtag position */ 1910 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1911 SCTP_BASE_INFO(hashasocmark))]; 1912 /* 1913 * put it in the bucket in the vtag hash of assoc's for the 1914 * system 1915 */ 1916 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1917 1918 SCTP_TCB_SEND_UNLOCK(stcb); 1919 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1920 SCTP_INP_INFO_WUNLOCK(); 1921 asoc->total_flight = 0; 1922 asoc->total_flight_count = 0; 1923 /* process the INIT info (peer's info) */ 1924 if (sctp_process_init(init_cp, stcb) < 0) { 1925 if (how_indx < sizeof(asoc->cookie_how)) 1926 asoc->cookie_how[how_indx] = 13; 1927 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 1928 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n"); 1929 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1930 src, dst, sh, op_err, 1931 mflowtype, mflowid, 1932 vrf_id, net->port); 1933 return (NULL); 1934 } 1935 /* 1936 * since we did not send a HB make sure we don't double 1937 * things 1938 */ 1939 net->hb_responded = 1; 1940 1941 if ((retval = sctp_load_addresses_from_init(stcb, m, 1942 init_offset + sizeof(struct sctp_init_chunk), 1943 initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) { 1944 if (how_indx < sizeof(asoc->cookie_how)) 1945 asoc->cookie_how[how_indx] = 14; 1946 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 1947 "Problem with address parameters"); 1948 SCTPDBG(SCTP_DEBUG_INPUT1, 1949 "Load addresses from INIT causes an abort %d\n", 1950 retval); 1951 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1952 src, dst, sh, op_err, 1953 mflowtype, mflowid, 1954 vrf_id, net->port); 1955 return (NULL); 1956 } 1957 /* respond with a COOKIE-ACK */ 1958 sctp_send_cookie_ack(stcb); 1959 if (how_indx < sizeof(asoc->cookie_how)) 1960 asoc->cookie_how[how_indx] = 15; 1961 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE) && 1962 (asoc->sctp_autoclose_ticks > 0)) { 1963 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 1964 } 1965 return (stcb); 1966 } 1967 if (how_indx < sizeof(asoc->cookie_how)) 1968 asoc->cookie_how[how_indx] = 16; 1969 /* all other cases... */ 1970 SCTP_TCB_UNLOCK(stcb); 1971 return (NULL); 1972} 1973 1974/* 1975 * handle a state cookie for a new association m: input packet mbuf chain-- 1976 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 1977 * and the cookie signature does not exist offset: offset into mbuf to the 1978 * cookie-echo chunk length: length of the cookie chunk to: where the init 1979 * was from returns a new TCB 1980 */ 1981static struct sctp_tcb * 1982sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1983 struct sockaddr *src, struct sockaddr *dst, 1984 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1985 struct sctp_inpcb *inp, struct sctp_nets **netp, 1986 struct sockaddr *init_src, int *notification, 1987 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1988 uint8_t mflowtype, uint32_t mflowid, 1989 uint32_t vrf_id, uint16_t port) 1990{ 1991 struct sctp_tcb *stcb; 1992 struct sctp_init_chunk *init_cp, init_buf; 1993 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1994 union sctp_sockstore store; 1995 struct sctp_association *asoc; 1996 int init_offset, initack_offset, initack_limit; 1997 int retval; 1998 int error = 0; 1999 uint8_t auth_chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 2000 2001 /* 2002 * find and validate the INIT chunk in the cookie (peer's info) the 2003 * INIT should start after the cookie-echo header struct (chunk 2004 * header, state cookie header struct) 2005 */ 2006 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 2007 init_cp = (struct sctp_init_chunk *) 2008 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 2009 (uint8_t *)&init_buf); 2010 if (init_cp == NULL) { 2011 /* could not pull a INIT chunk in cookie */ 2012 SCTPDBG(SCTP_DEBUG_INPUT1, 2013 "process_cookie_new: could not pull INIT chunk hdr\n"); 2014 return (NULL); 2015 } 2016 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 2017 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 2018 return (NULL); 2019 } 2020 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 2021 /* 2022 * find and validate the INIT-ACK chunk in the cookie (my info) the 2023 * INIT-ACK follows the INIT chunk 2024 */ 2025 initack_cp = (struct sctp_init_ack_chunk *) 2026 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2027 (uint8_t *)&initack_buf); 2028 if (initack_cp == NULL) { 2029 /* could not pull INIT-ACK chunk in cookie */ 2030 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2031 return (NULL); 2032 } 2033 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2034 return (NULL); 2035 } 2036 /* 2037 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2038 * "initack_limit" value. This is because the chk_length field 2039 * includes the length of the cookie, but the cookie is omitted when 2040 * the INIT and INIT_ACK are tacked onto the cookie... 2041 */ 2042 initack_limit = offset + cookie_len; 2043 2044 /* 2045 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2046 * and popluate 2047 */ 2048 2049 /* 2050 * Here we do a trick, we set in NULL for the proc/thread argument. 2051 * We do this since in effect we only use the p argument when the 2052 * socket is unbound and we must do an implicit bind. Since we are 2053 * getting a cookie, we cannot be unbound. 2054 */ 2055 stcb = sctp_aloc_assoc(inp, init_src, &error, 2056 ntohl(initack_cp->init.initiate_tag), vrf_id, 2057 ntohs(initack_cp->init.num_outbound_streams), 2058 port, 2059 (struct thread *)NULL, 2060 SCTP_DONT_INITIALIZE_AUTH_PARAMS); 2061 if (stcb == NULL) { 2062 struct mbuf *op_err; 2063 2064 /* memory problem? */ 2065 SCTPDBG(SCTP_DEBUG_INPUT1, 2066 "process_cookie_new: no room for another TCB!\n"); 2067 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2068 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2069 src, dst, sh, op_err, 2070 mflowtype, mflowid, 2071 vrf_id, port); 2072 return (NULL); 2073 } 2074 asoc = &stcb->asoc; 2075 /* get scope variables out of cookie */ 2076 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2077 asoc->scope.site_scope = cookie->site_scope; 2078 asoc->scope.local_scope = cookie->local_scope; 2079 asoc->scope.loopback_scope = cookie->loopback_scope; 2080 2081 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2082 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2083 struct mbuf *op_err; 2084 2085 /* 2086 * Houston we have a problem. The EP changed while the 2087 * cookie was in flight. Only recourse is to abort the 2088 * association. 2089 */ 2090 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2091 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2092 src, dst, sh, op_err, 2093 mflowtype, mflowid, 2094 vrf_id, port); 2095 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2096 SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2097 return (NULL); 2098 } 2099 /* process the INIT-ACK info (my info) */ 2100 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2101 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2102 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2103 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2104 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2105 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2106 asoc->str_reset_seq_in = asoc->init_seq_number; 2107 2108 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2109 2110 /* process the INIT info (peer's info) */ 2111 if (sctp_process_init(init_cp, stcb) < 0) { 2112 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2113 SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2114 return (NULL); 2115 } 2116 /* load all addresses */ 2117 if ((retval = sctp_load_addresses_from_init(stcb, m, 2118 init_offset + sizeof(struct sctp_init_chunk), 2119 initack_offset, src, dst, init_src, port)) < 0) { 2120 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2121 SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2122 return (NULL); 2123 } 2124 /* 2125 * verify any preceding AUTH chunk that was skipped 2126 */ 2127 /* pull the local authentication parameters from the cookie/init-ack */ 2128 sctp_auth_get_cookie_params(stcb, m, 2129 initack_offset + sizeof(struct sctp_init_ack_chunk), 2130 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2131 if (auth_skipped) { 2132 struct sctp_auth_chunk *auth; 2133 2134 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) { 2135 auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2136 } else { 2137 auth = NULL; 2138 } 2139 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2140 /* auth HMAC failed, dump the assoc and packet */ 2141 SCTPDBG(SCTP_DEBUG_AUTH1, 2142 "COOKIE-ECHO: AUTH failed\n"); 2143 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2144 SCTP_FROM_SCTP_INPUT + SCTP_LOC_21); 2145 return (NULL); 2146 } else { 2147 /* remaining chunks checked... good to go */ 2148 stcb->asoc.authenticated = 1; 2149 } 2150 } 2151 2152 /* 2153 * if we're doing ASCONFs, check to see if we have any new local 2154 * addresses that need to get added to the peer (eg. addresses 2155 * changed while cookie echo in flight). This needs to be done 2156 * after we go to the OPEN state to do the correct asconf 2157 * processing. else, make sure we have the correct addresses in our 2158 * lists 2159 */ 2160 2161 /* warning, we re-use sin, sin6, sa_store here! */ 2162 /* pull in local_address (our "from" address) */ 2163 switch (cookie->laddr_type) { 2164#ifdef INET 2165 case SCTP_IPV4_ADDRESS: 2166 /* source addr is IPv4 */ 2167 memset(&store.sin, 0, sizeof(struct sockaddr_in)); 2168 store.sin.sin_family = AF_INET; 2169 store.sin.sin_len = sizeof(struct sockaddr_in); 2170 store.sin.sin_addr.s_addr = cookie->laddress[0]; 2171 break; 2172#endif 2173#ifdef INET6 2174 case SCTP_IPV6_ADDRESS: 2175 /* source addr is IPv6 */ 2176 memset(&store.sin6, 0, sizeof(struct sockaddr_in6)); 2177 store.sin6.sin6_family = AF_INET6; 2178 store.sin6.sin6_len = sizeof(struct sockaddr_in6); 2179 store.sin6.sin6_scope_id = cookie->scope_id; 2180 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr)); 2181 break; 2182#endif 2183 default: 2184 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2185 SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 2186 return (NULL); 2187 } 2188 2189 /* update current state */ 2190 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2191 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2192 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2193 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2194 stcb->sctp_ep, stcb, NULL); 2195 } 2196 sctp_stop_all_cookie_timers(stcb); 2197 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2198 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2199 2200 /* set up to notify upper layer */ 2201 *notification = SCTP_NOTIFY_ASSOC_UP; 2202 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2203 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2204 (!SCTP_IS_LISTENING(inp))) { 2205 /* 2206 * This is an endpoint that called connect() how it got a 2207 * cookie that is NEW is a bit of a mystery. It must be that 2208 * the INIT was sent, but before it got there.. a complete 2209 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2210 * should have went to the other code.. not here.. oh well.. 2211 * a bit of protection is worth having.. 2212 */ 2213 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2214 soisconnected(stcb->sctp_socket); 2215 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2216 (SCTP_IS_LISTENING(inp))) { 2217 /* 2218 * We don't want to do anything with this one. Since it is 2219 * the listening guy. The timer will get started for 2220 * accepted connections in the caller. 2221 */ 2222 ; 2223 } 2224 if (stcb->asoc.sctp_autoclose_ticks && 2225 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2226 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2227 } 2228 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2229 *netp = sctp_findnet(stcb, init_src); 2230 if (*netp != NULL) { 2231 struct timeval old; 2232 2233 /* 2234 * Since we did not send a HB, make sure we don't double 2235 * things. 2236 */ 2237 (*netp)->hb_responded = 1; 2238 /* Calculate the RTT. */ 2239 old.tv_sec = cookie->time_entered.tv_sec; 2240 old.tv_usec = cookie->time_entered.tv_usec; 2241 sctp_calculate_rto(stcb, asoc, *netp, &old, SCTP_RTT_FROM_NON_DATA); 2242 } 2243 /* respond with a COOKIE-ACK */ 2244 sctp_send_cookie_ack(stcb); 2245 2246 /* 2247 * check the address lists for any ASCONFs that need to be sent 2248 * AFTER the cookie-ack is sent 2249 */ 2250 sctp_check_address_list(stcb, m, 2251 initack_offset + sizeof(struct sctp_init_ack_chunk), 2252 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2253 &store.sa, cookie->local_scope, cookie->site_scope, 2254 cookie->ipv4_scope, cookie->loopback_scope); 2255 2256 return (stcb); 2257} 2258 2259/* 2260 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2261 * we NEED to make sure we are not already using the vtag. If so we 2262 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2263 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2264 SCTP_BASE_INFO(hashasocmark))]; 2265 LIST_FOREACH(stcb, head, sctp_asocs) { 2266 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2267 -- SEND ABORT - TRY AGAIN -- 2268 } 2269 } 2270*/ 2271 2272/* 2273 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2274 * existing (non-NULL) TCB 2275 */ 2276static struct mbuf * 2277sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2278 struct sockaddr *src, struct sockaddr *dst, 2279 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2280 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2281 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2282 struct sctp_tcb **locked_tcb, 2283 uint8_t mflowtype, uint32_t mflowid, 2284 uint32_t vrf_id, uint16_t port) 2285{ 2286 struct sctp_state_cookie *cookie; 2287 struct sctp_tcb *l_stcb = *stcb; 2288 struct sctp_inpcb *l_inp; 2289 struct sockaddr *to; 2290 struct sctp_pcb *ep; 2291 struct mbuf *m_sig; 2292 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2293 uint8_t *sig; 2294 uint8_t cookie_ok = 0; 2295 unsigned int sig_offset, cookie_offset; 2296 unsigned int cookie_len; 2297 struct timeval now; 2298 struct timeval time_entered, time_expires; 2299 int notification = 0; 2300 struct sctp_nets *netl; 2301 int had_a_existing_tcb = 0; 2302 int send_int_conf = 0; 2303#ifdef INET 2304 struct sockaddr_in sin; 2305#endif 2306#ifdef INET6 2307 struct sockaddr_in6 sin6; 2308#endif 2309 2310 SCTPDBG(SCTP_DEBUG_INPUT2, 2311 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2312 2313 if (inp_p == NULL) { 2314 return (NULL); 2315 } 2316 cookie = &cp->cookie; 2317 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2318 cookie_len = ntohs(cp->ch.chunk_length); 2319 2320 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2321 sizeof(struct sctp_init_chunk) + 2322 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2323 /* cookie too small */ 2324 return (NULL); 2325 } 2326 if ((cookie->peerport != sh->src_port) || 2327 (cookie->myport != sh->dest_port) || 2328 (cookie->my_vtag != sh->v_tag)) { 2329 /* 2330 * invalid ports or bad tag. Note that we always leave the 2331 * v_tag in the header in network order and when we stored 2332 * it in the my_vtag slot we also left it in network order. 2333 * This maintains the match even though it may be in the 2334 * opposite byte order of the machine :-> 2335 */ 2336 return (NULL); 2337 } 2338 /* 2339 * split off the signature into its own mbuf (since it should not be 2340 * calculated in the sctp_hmac_m() call). 2341 */ 2342 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2343 m_sig = m_split(m, sig_offset, M_NOWAIT); 2344 if (m_sig == NULL) { 2345 /* out of memory or ?? */ 2346 return (NULL); 2347 } 2348#ifdef SCTP_MBUF_LOGGING 2349 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2350 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT); 2351 } 2352#endif 2353 2354 /* 2355 * compute the signature/digest for the cookie 2356 */ 2357 ep = &(*inp_p)->sctp_ep; 2358 l_inp = *inp_p; 2359 if (l_stcb) { 2360 SCTP_TCB_UNLOCK(l_stcb); 2361 } 2362 SCTP_INP_RLOCK(l_inp); 2363 if (l_stcb) { 2364 SCTP_TCB_LOCK(l_stcb); 2365 } 2366 /* which cookie is it? */ 2367 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2368 (ep->current_secret_number != ep->last_secret_number)) { 2369 /* it's the old cookie */ 2370 (void)sctp_hmac_m(SCTP_HMAC, 2371 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2372 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2373 } else { 2374 /* it's the current cookie */ 2375 (void)sctp_hmac_m(SCTP_HMAC, 2376 (uint8_t *)ep->secret_key[(int)ep->current_secret_number], 2377 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2378 } 2379 /* get the signature */ 2380 SCTP_INP_RUNLOCK(l_inp); 2381 sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig); 2382 if (sig == NULL) { 2383 /* couldn't find signature */ 2384 sctp_m_freem(m_sig); 2385 return (NULL); 2386 } 2387 /* compare the received digest with the computed digest */ 2388 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2389 /* try the old cookie? */ 2390 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2391 (ep->current_secret_number != ep->last_secret_number)) { 2392 /* compute digest with old */ 2393 (void)sctp_hmac_m(SCTP_HMAC, 2394 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2395 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2396 /* compare */ 2397 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2398 cookie_ok = 1; 2399 } 2400 } else { 2401 cookie_ok = 1; 2402 } 2403 2404 /* 2405 * Now before we continue we must reconstruct our mbuf so that 2406 * normal processing of any other chunks will work. 2407 */ 2408 { 2409 struct mbuf *m_at; 2410 2411 m_at = m; 2412 while (SCTP_BUF_NEXT(m_at) != NULL) { 2413 m_at = SCTP_BUF_NEXT(m_at); 2414 } 2415 SCTP_BUF_NEXT(m_at) = m_sig; 2416 } 2417 2418 if (cookie_ok == 0) { 2419 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2420 SCTPDBG(SCTP_DEBUG_INPUT2, 2421 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2422 (uint32_t)offset, cookie_offset, sig_offset); 2423 return (NULL); 2424 } 2425 2426 if (sctp_ticks_to_msecs(cookie->cookie_life) > SCTP_MAX_COOKIE_LIFE) { 2427 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: Invalid cookie lifetime\n"); 2428 return (NULL); 2429 } 2430 time_entered.tv_sec = cookie->time_entered.tv_sec; 2431 time_entered.tv_usec = cookie->time_entered.tv_usec; 2432 if ((time_entered.tv_sec < 0) || 2433 (time_entered.tv_usec < 0) || 2434 (time_entered.tv_usec >= 1000000)) { 2435 /* Invalid time stamp. Cookie must have been modified. */ 2436 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: Invalid time stamp\n"); 2437 return (NULL); 2438 } 2439 (void)SCTP_GETTIME_TIMEVAL(&now); 2440 if (timevalcmp(&now, &time_entered, <)) { 2441 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie generated in the future!\n"); 2442 return (NULL); 2443 } 2444 /* 2445 * Check the cookie timestamps to be sure it's not stale. 2446 * cookie_life is in ticks, so we convert to seconds. 2447 */ 2448 time_expires.tv_sec = time_entered.tv_sec + sctp_ticks_to_secs(cookie->cookie_life); 2449 time_expires.tv_usec = time_entered.tv_usec; 2450 if (timevalcmp(&now, &time_expires, >)) { 2451 /* cookie is stale! */ 2452 struct mbuf *op_err; 2453 struct sctp_error_stale_cookie *cause; 2454 struct timeval diff; 2455 uint32_t staleness; 2456 2457 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie), 2458 0, M_NOWAIT, 1, MT_DATA); 2459 if (op_err == NULL) { 2460 /* FOOBAR */ 2461 return (NULL); 2462 } 2463 /* Set the len */ 2464 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie); 2465 cause = mtod(op_err, struct sctp_error_stale_cookie *); 2466 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE); 2467 cause->cause.length = htons(sizeof(struct sctp_error_stale_cookie)); 2468 diff = now; 2469 timevalsub(&diff, &time_expires); 2470 if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) { 2471 staleness = UINT32_MAX; 2472 } else { 2473 staleness = diff.tv_sec * 1000000; 2474 } 2475 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) { 2476 staleness += diff.tv_usec; 2477 } else { 2478 staleness = UINT32_MAX; 2479 } 2480 cause->stale_time = htonl(staleness); 2481 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2482 mflowtype, mflowid, l_inp->fibnum, 2483 vrf_id, port); 2484 return (NULL); 2485 } 2486 /* 2487 * Now we must see with the lookup address if we have an existing 2488 * asoc. This will only happen if we were in the COOKIE-WAIT state 2489 * and a INIT collided with us and somewhere the peer sent the 2490 * cookie on another address besides the single address our assoc 2491 * had for him. In this case we will have one of the tie-tags set at 2492 * least AND the address field in the cookie can be used to look it 2493 * up. 2494 */ 2495 to = NULL; 2496 switch (cookie->addr_type) { 2497#ifdef INET6 2498 case SCTP_IPV6_ADDRESS: 2499 memset(&sin6, 0, sizeof(sin6)); 2500 sin6.sin6_family = AF_INET6; 2501 sin6.sin6_len = sizeof(sin6); 2502 sin6.sin6_port = sh->src_port; 2503 sin6.sin6_scope_id = cookie->scope_id; 2504 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2505 sizeof(sin6.sin6_addr.s6_addr)); 2506 to = (struct sockaddr *)&sin6; 2507 break; 2508#endif 2509#ifdef INET 2510 case SCTP_IPV4_ADDRESS: 2511 memset(&sin, 0, sizeof(sin)); 2512 sin.sin_family = AF_INET; 2513 sin.sin_len = sizeof(sin); 2514 sin.sin_port = sh->src_port; 2515 sin.sin_addr.s_addr = cookie->address[0]; 2516 to = (struct sockaddr *)&sin; 2517 break; 2518#endif 2519 default: 2520 /* This should not happen */ 2521 return (NULL); 2522 } 2523 if (*stcb == NULL) { 2524 /* Yep, lets check */ 2525 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2526 if (*stcb == NULL) { 2527 /* 2528 * We should have only got back the same inp. If we 2529 * got back a different ep we have a problem. The 2530 * original findep got back l_inp and now 2531 */ 2532 if (l_inp != *inp_p) { 2533 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2534 } 2535 } else { 2536 if (*locked_tcb == NULL) { 2537 /* 2538 * In this case we found the assoc only 2539 * after we locked the create lock. This 2540 * means we are in a colliding case and we 2541 * must make sure that we unlock the tcb if 2542 * its one of the cases where we throw away 2543 * the incoming packets. 2544 */ 2545 *locked_tcb = *stcb; 2546 2547 /* 2548 * We must also increment the inp ref count 2549 * since the ref_count flags was set when we 2550 * did not find the TCB, now we found it 2551 * which reduces the refcount.. we must 2552 * raise it back out to balance it all :-) 2553 */ 2554 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2555 if ((*stcb)->sctp_ep != l_inp) { 2556 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2557 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2558 } 2559 } 2560 } 2561 } 2562 2563 cookie_len -= SCTP_SIGNATURE_SIZE; 2564 if (*stcb == NULL) { 2565 /* this is the "normal" case... get a new TCB */ 2566 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2567 cookie, cookie_len, *inp_p, 2568 netp, to, ¬ification, 2569 auth_skipped, auth_offset, auth_len, 2570 mflowtype, mflowid, 2571 vrf_id, port); 2572 } else { 2573 /* this is abnormal... cookie-echo on existing TCB */ 2574 had_a_existing_tcb = 1; 2575 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2576 src, dst, sh, 2577 cookie, cookie_len, *inp_p, *stcb, netp, to, 2578 ¬ification, auth_skipped, auth_offset, auth_len, 2579 mflowtype, mflowid, 2580 vrf_id, port); 2581 if (*stcb == NULL) { 2582 *locked_tcb = NULL; 2583 } 2584 } 2585 2586 if (*stcb == NULL) { 2587 /* still no TCB... must be bad cookie-echo */ 2588 return (NULL); 2589 } 2590 if (*netp != NULL) { 2591 (*netp)->flowtype = mflowtype; 2592 (*netp)->flowid = mflowid; 2593 } 2594 /* 2595 * Ok, we built an association so confirm the address we sent the 2596 * INIT-ACK to. 2597 */ 2598 netl = sctp_findnet(*stcb, to); 2599 /* 2600 * This code should in theory NOT run but 2601 */ 2602 if (netl == NULL) { 2603 /* TSNH! Huh, why do I need to add this address here? */ 2604 if (sctp_add_remote_addr(*stcb, to, NULL, port, 2605 SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2606 return (NULL); 2607 } 2608 netl = sctp_findnet(*stcb, to); 2609 } 2610 if (netl) { 2611 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2612 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2613 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2614 netl); 2615 send_int_conf = 1; 2616 } 2617 } 2618 sctp_start_net_timers(*stcb); 2619 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2620 if (!had_a_existing_tcb || 2621 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2622 /* 2623 * If we have a NEW cookie or the connect never 2624 * reached the connected state during collision we 2625 * must do the TCP accept thing. 2626 */ 2627 struct socket *so, *oso; 2628 struct sctp_inpcb *inp; 2629 2630 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2631 /* 2632 * For a restart we will keep the same 2633 * socket, no need to do anything. I THINK!! 2634 */ 2635 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2636 if (send_int_conf) { 2637 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2638 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2639 } 2640 return (m); 2641 } 2642 oso = (*inp_p)->sctp_socket; 2643 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2644 SCTP_TCB_UNLOCK((*stcb)); 2645 CURVNET_SET(oso->so_vnet); 2646 so = sonewconn(oso, 0 2647 ); 2648 CURVNET_RESTORE(); 2649 SCTP_TCB_LOCK((*stcb)); 2650 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2651 2652 if (so == NULL) { 2653 struct mbuf *op_err; 2654 2655 /* Too many sockets */ 2656 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2657 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2658 sctp_abort_association(*inp_p, NULL, m, iphlen, 2659 src, dst, sh, op_err, 2660 mflowtype, mflowid, 2661 vrf_id, port); 2662 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, 2663 SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 2664 return (NULL); 2665 } 2666 inp = (struct sctp_inpcb *)so->so_pcb; 2667 SCTP_INP_INCR_REF(inp); 2668 /* 2669 * We add the unbound flag here so that if we get an 2670 * soabort() before we get the move_pcb done, we 2671 * will properly cleanup. 2672 */ 2673 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2674 SCTP_PCB_FLAGS_CONNECTED | 2675 SCTP_PCB_FLAGS_IN_TCPPOOL | 2676 SCTP_PCB_FLAGS_UNBOUND | 2677 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2678 SCTP_PCB_FLAGS_DONT_WAKE); 2679 inp->sctp_features = (*inp_p)->sctp_features; 2680 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2681 inp->sctp_socket = so; 2682 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2683 inp->max_cwnd = (*inp_p)->max_cwnd; 2684 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2685 inp->ecn_supported = (*inp_p)->ecn_supported; 2686 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2687 inp->auth_supported = (*inp_p)->auth_supported; 2688 inp->asconf_supported = (*inp_p)->asconf_supported; 2689 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2690 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2691 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2692 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2693 inp->sctp_context = (*inp_p)->sctp_context; 2694 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2695 inp->fibnum = (*inp_p)->fibnum; 2696 inp->inp_starting_point_for_iterator = NULL; 2697 /* 2698 * copy in the authentication parameters from the 2699 * original endpoint 2700 */ 2701 if (inp->sctp_ep.local_hmacs) 2702 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2703 inp->sctp_ep.local_hmacs = 2704 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2705 if (inp->sctp_ep.local_auth_chunks) 2706 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2707 inp->sctp_ep.local_auth_chunks = 2708 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2709 2710 /* 2711 * Now we must move it from one hash table to 2712 * another and get the tcb in the right place. 2713 */ 2714 2715 /* 2716 * This is where the one-2-one socket is put into 2717 * the accept state waiting for the accept! 2718 */ 2719 if (*stcb) { 2720 SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE); 2721 } 2722 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2723 2724 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2725 SCTP_TCB_UNLOCK((*stcb)); 2726 2727 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2728 0); 2729 SCTP_TCB_LOCK((*stcb)); 2730 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2731 2732 /* 2733 * now we must check to see if we were aborted while 2734 * the move was going on and the lock/unlock 2735 * happened. 2736 */ 2737 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2738 /* 2739 * yep it was, we leave the assoc attached 2740 * to the socket since the sctp_inpcb_free() 2741 * call will send an abort for us. 2742 */ 2743 SCTP_INP_DECR_REF(inp); 2744 return (NULL); 2745 } 2746 SCTP_INP_DECR_REF(inp); 2747 /* Switch over to the new guy */ 2748 *inp_p = inp; 2749 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2750 if (send_int_conf) { 2751 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2752 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2753 } 2754 2755 /* 2756 * Pull it from the incomplete queue and wake the 2757 * guy 2758 */ 2759 soisconnected(so); 2760 return (m); 2761 } 2762 } 2763 if (notification) { 2764 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2765 } 2766 if (send_int_conf) { 2767 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2768 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2769 } 2770 return (m); 2771} 2772 2773static void 2774sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2775 struct sctp_tcb *stcb, struct sctp_nets *net) 2776{ 2777 /* cp must not be used, others call this without a c-ack :-) */ 2778 struct sctp_association *asoc; 2779 struct sctp_tmit_chunk *chk; 2780 2781 SCTPDBG(SCTP_DEBUG_INPUT2, 2782 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2783 if ((stcb == NULL) || (net == NULL)) { 2784 return; 2785 } 2786 2787 asoc = &stcb->asoc; 2788 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 2789 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 2790 asoc->overall_error_count, 2791 0, 2792 SCTP_FROM_SCTP_INPUT, 2793 __LINE__); 2794 } 2795 asoc->overall_error_count = 0; 2796 sctp_stop_all_cookie_timers(stcb); 2797 /* process according to association state */ 2798 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) { 2799 /* state change only needed when I am in right state */ 2800 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2801 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2802 sctp_start_net_timers(stcb); 2803 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2804 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2805 stcb->sctp_ep, stcb, NULL); 2806 } 2807 /* update RTO */ 2808 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2809 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2810 if (asoc->overall_error_count == 0) { 2811 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 2812 SCTP_RTT_FROM_NON_DATA); 2813 } 2814 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2815 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2816 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2817 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2818 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2819 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2820 soisconnected(stcb->sctp_socket); 2821 } 2822 } 2823 /* 2824 * since we did not send a HB make sure we don't double 2825 * things 2826 */ 2827 net->hb_responded = 1; 2828 2829 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2830 /* 2831 * We don't need to do the asconf thing, nor hb or 2832 * autoclose if the socket is closed. 2833 */ 2834 goto closed_socket; 2835 } 2836 2837 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2838 stcb, net); 2839 2840 if (stcb->asoc.sctp_autoclose_ticks && 2841 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2842 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2843 stcb->sctp_ep, stcb, NULL); 2844 } 2845 /* 2846 * send ASCONF if parameters are pending and ASCONFs are 2847 * allowed (eg. addresses changed when init/cookie echo were 2848 * in flight) 2849 */ 2850 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2851 (stcb->asoc.asconf_supported == 1) && 2852 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2853#ifdef SCTP_TIMER_BASED_ASCONF 2854 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2855 stcb->sctp_ep, stcb, 2856 stcb->asoc.primary_destination); 2857#else 2858 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2859 SCTP_ADDR_NOT_LOCKED); 2860#endif 2861 } 2862 } 2863closed_socket: 2864 /* Toss the cookie if I can */ 2865 sctp_toss_old_cookies(stcb, asoc); 2866 /* Restart the timer if we have pending data */ 2867 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) { 2868 if (chk->whoTo != NULL) { 2869 break; 2870 } 2871 } 2872 if (chk != NULL) { 2873 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 2874 } 2875} 2876 2877static void 2878sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2879 struct sctp_tcb *stcb) 2880{ 2881 struct sctp_nets *net; 2882 struct sctp_tmit_chunk *lchk; 2883 struct sctp_ecne_chunk bkup; 2884 uint8_t override_bit; 2885 uint32_t tsn, window_data_tsn; 2886 int len; 2887 unsigned int pkt_cnt; 2888 2889 len = ntohs(cp->ch.chunk_length); 2890 if ((len != sizeof(struct sctp_ecne_chunk)) && 2891 (len != sizeof(struct old_sctp_ecne_chunk))) { 2892 return; 2893 } 2894 if (len == sizeof(struct old_sctp_ecne_chunk)) { 2895 /* Its the old format */ 2896 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 2897 bkup.num_pkts_since_cwr = htonl(1); 2898 cp = &bkup; 2899 } 2900 SCTP_STAT_INCR(sctps_recvecne); 2901 tsn = ntohl(cp->tsn); 2902 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 2903 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 2904 if (lchk == NULL) { 2905 window_data_tsn = stcb->asoc.sending_seq - 1; 2906 } else { 2907 window_data_tsn = lchk->rec.data.tsn; 2908 } 2909 2910 /* Find where it was sent to if possible. */ 2911 net = NULL; 2912 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 2913 if (lchk->rec.data.tsn == tsn) { 2914 net = lchk->whoTo; 2915 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 2916 break; 2917 } 2918 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) { 2919 break; 2920 } 2921 } 2922 if (net == NULL) { 2923 /* 2924 * What to do. A previous send of a CWR was possibly lost. 2925 * See how old it is, we may have it marked on the actual 2926 * net. 2927 */ 2928 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 2929 if (tsn == net->last_cwr_tsn) { 2930 /* Found him, send it off */ 2931 break; 2932 } 2933 } 2934 if (net == NULL) { 2935 /* 2936 * If we reach here, we need to send a special CWR 2937 * that says hey, we did this a long time ago and 2938 * you lost the response. 2939 */ 2940 net = TAILQ_FIRST(&stcb->asoc.nets); 2941 if (net == NULL) { 2942 /* TSNH */ 2943 return; 2944 } 2945 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 2946 } else { 2947 override_bit = 0; 2948 } 2949 } else { 2950 override_bit = 0; 2951 } 2952 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 2953 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 2954 /* 2955 * JRS - Use the congestion control given in the pluggable 2956 * CC module 2957 */ 2958 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 2959 /* 2960 * We reduce once every RTT. So we will only lower cwnd at 2961 * the next sending seq i.e. the window_data_tsn 2962 */ 2963 net->cwr_window_tsn = window_data_tsn; 2964 net->ecn_ce_pkt_cnt += pkt_cnt; 2965 net->lost_cnt = pkt_cnt; 2966 net->last_cwr_tsn = tsn; 2967 } else { 2968 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 2969 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 2970 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 2971 /* 2972 * Another loss in the same window update how many 2973 * marks/packets lost we have had. 2974 */ 2975 int cnt = 1; 2976 2977 if (pkt_cnt > net->lost_cnt) { 2978 /* Should be the case */ 2979 cnt = (pkt_cnt - net->lost_cnt); 2980 net->ecn_ce_pkt_cnt += cnt; 2981 } 2982 net->lost_cnt = pkt_cnt; 2983 net->last_cwr_tsn = tsn; 2984 /* 2985 * Most CC functions will ignore this call, since we 2986 * are in-window yet of the initial CE the peer saw. 2987 */ 2988 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 2989 } 2990 } 2991 /* 2992 * We always send a CWR this way if our previous one was lost our 2993 * peer will get an update, or if it is not time again to reduce we 2994 * still get the cwr to the peer. Note we set the override when we 2995 * could not find the TSN on the chunk or the destination network. 2996 */ 2997 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 2998} 2999 3000static void 3001sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 3002{ 3003 /* 3004 * Here we get a CWR from the peer. We must look in the outqueue and 3005 * make sure that we have a covered ECNE in the control chunk part. 3006 * If so remove it. 3007 */ 3008 struct sctp_tmit_chunk *chk, *nchk; 3009 struct sctp_ecne_chunk *ecne; 3010 int override; 3011 uint32_t cwr_tsn; 3012 3013 cwr_tsn = ntohl(cp->tsn); 3014 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3015 TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) { 3016 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3017 continue; 3018 } 3019 if ((override == 0) && (chk->whoTo != net)) { 3020 /* Must be from the right src unless override is set */ 3021 continue; 3022 } 3023 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3024 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3025 /* this covers this ECNE, we can remove it */ 3026 stcb->asoc.ecn_echo_cnt_onq--; 3027 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3028 sctp_next); 3029 stcb->asoc.ctrl_queue_cnt--; 3030 sctp_m_freem(chk->data); 3031 chk->data = NULL; 3032 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3033 if (override == 0) { 3034 break; 3035 } 3036 } 3037 } 3038} 3039 3040static void 3041sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3042 struct sctp_tcb *stcb, struct sctp_nets *net) 3043{ 3044 3045 SCTPDBG(SCTP_DEBUG_INPUT2, 3046 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3047 if (stcb == NULL) 3048 return; 3049 3050 /* process according to association state */ 3051 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3052 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3053 SCTPDBG(SCTP_DEBUG_INPUT2, 3054 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3055 SCTP_TCB_UNLOCK(stcb); 3056 return; 3057 } 3058 /* notify upper layer protocol */ 3059 if (stcb->sctp_socket) { 3060 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3061 } 3062#ifdef INVARIANTS 3063 if (!TAILQ_EMPTY(&stcb->asoc.send_queue) || 3064 !TAILQ_EMPTY(&stcb->asoc.sent_queue) || 3065 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 3066 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3067 } 3068#endif 3069 /* stop the timer */ 3070 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, 3071 SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3072 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3073 /* free the TCB */ 3074 SCTPDBG(SCTP_DEBUG_INPUT2, 3075 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3076 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 3077 SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3078 return; 3079} 3080 3081static int 3082process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3083 struct sctp_nets *net, uint8_t flg) 3084{ 3085 switch (desc->chunk_type) { 3086 case SCTP_DATA: 3087 case SCTP_IDATA: 3088 /* find the tsn to resend (possibly) */ 3089 { 3090 uint32_t tsn; 3091 struct sctp_tmit_chunk *tp1; 3092 3093 tsn = ntohl(desc->tsn_ifany); 3094 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3095 if (tp1->rec.data.tsn == tsn) { 3096 /* found it */ 3097 break; 3098 } 3099 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) { 3100 /* not found */ 3101 tp1 = NULL; 3102 break; 3103 } 3104 } 3105 if (tp1 == NULL) { 3106 /* 3107 * Do it the other way , aka without paying 3108 * attention to queue seq order. 3109 */ 3110 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3111 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3112 if (tp1->rec.data.tsn == tsn) { 3113 /* found it */ 3114 break; 3115 } 3116 } 3117 } 3118 if (tp1 == NULL) { 3119 SCTP_STAT_INCR(sctps_pdrptsnnf); 3120 } 3121 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3122 if (((flg & SCTP_BADCRC) == 0) && 3123 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3124 return (0); 3125 } 3126 if ((stcb->asoc.peers_rwnd == 0) && 3127 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3128 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3129 return (0); 3130 } 3131 if (stcb->asoc.peers_rwnd == 0 && 3132 (flg & SCTP_FROM_MIDDLE_BOX)) { 3133 SCTP_STAT_INCR(sctps_pdrpdizrw); 3134 return (0); 3135 } 3136 if ((uint32_t)SCTP_BUF_LEN(tp1->data) < 3137 SCTP_DATA_CHUNK_OVERHEAD(stcb) + SCTP_NUM_DB_TO_VERIFY) { 3138 /* Payload not matching. */ 3139 SCTP_STAT_INCR(sctps_pdrpbadd); 3140 return (-1); 3141 } 3142 if (memcmp(mtod(tp1->data, caddr_t)+SCTP_DATA_CHUNK_OVERHEAD(stcb), 3143 desc->data_bytes, SCTP_NUM_DB_TO_VERIFY) != 0) { 3144 /* Payload not matching. */ 3145 SCTP_STAT_INCR(sctps_pdrpbadd); 3146 return (-1); 3147 } 3148 if (tp1->do_rtt) { 3149 /* 3150 * this guy had a RTO calculation 3151 * pending on it, cancel it 3152 */ 3153 if (tp1->whoTo->rto_needed == 0) { 3154 tp1->whoTo->rto_needed = 1; 3155 } 3156 tp1->do_rtt = 0; 3157 } 3158 SCTP_STAT_INCR(sctps_pdrpmark); 3159 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3160 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3161 /* 3162 * mark it as if we were doing a FR, since 3163 * we will be getting gap ack reports behind 3164 * the info from the router. 3165 */ 3166 tp1->rec.data.doing_fast_retransmit = 1; 3167 /* 3168 * mark the tsn with what sequences can 3169 * cause a new FR. 3170 */ 3171 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3172 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3173 } else { 3174 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn; 3175 } 3176 3177 /* restart the timer */ 3178 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3179 stcb, tp1->whoTo, 3180 SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3181 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3182 stcb, tp1->whoTo); 3183 3184 /* fix counts and things */ 3185 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3186 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3187 tp1->whoTo->flight_size, 3188 tp1->book_size, 3189 (uint32_t)(uintptr_t)stcb, 3190 tp1->rec.data.tsn); 3191 } 3192 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3193 sctp_flight_size_decrease(tp1); 3194 sctp_total_flight_decrease(stcb, tp1); 3195 } 3196 tp1->sent = SCTP_DATAGRAM_RESEND; 3197 } { 3198 /* audit code */ 3199 unsigned int audit; 3200 3201 audit = 0; 3202 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3203 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3204 audit++; 3205 } 3206 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3207 sctp_next) { 3208 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3209 audit++; 3210 } 3211 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3212 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3213 audit, stcb->asoc.sent_queue_retran_cnt); 3214#ifndef SCTP_AUDITING_ENABLED 3215 stcb->asoc.sent_queue_retran_cnt = audit; 3216#endif 3217 } 3218 } 3219 } 3220 break; 3221 case SCTP_ASCONF: 3222 { 3223 struct sctp_tmit_chunk *asconf; 3224 3225 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3226 sctp_next) { 3227 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3228 break; 3229 } 3230 } 3231 if (asconf) { 3232 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3233 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3234 asconf->sent = SCTP_DATAGRAM_RESEND; 3235 asconf->snd_count--; 3236 } 3237 } 3238 break; 3239 case SCTP_INITIATION: 3240 /* resend the INIT */ 3241 stcb->asoc.dropped_special_cnt++; 3242 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3243 /* 3244 * If we can get it in, in a few attempts we do 3245 * this, otherwise we let the timer fire. 3246 */ 3247 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3248 stcb, net, 3249 SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 3250 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3251 } 3252 break; 3253 case SCTP_SELECTIVE_ACK: 3254 case SCTP_NR_SELECTIVE_ACK: 3255 /* resend the sack */ 3256 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3257 break; 3258 case SCTP_HEARTBEAT_REQUEST: 3259 /* resend a demand HB */ 3260 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3261 /* 3262 * Only retransmit if we KNOW we wont destroy the 3263 * tcb 3264 */ 3265 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3266 } 3267 break; 3268 case SCTP_SHUTDOWN: 3269 sctp_send_shutdown(stcb, net); 3270 break; 3271 case SCTP_SHUTDOWN_ACK: 3272 sctp_send_shutdown_ack(stcb, net); 3273 break; 3274 case SCTP_COOKIE_ECHO: 3275 { 3276 struct sctp_tmit_chunk *cookie; 3277 3278 cookie = NULL; 3279 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3280 sctp_next) { 3281 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3282 break; 3283 } 3284 } 3285 if (cookie) { 3286 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3287 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3288 cookie->sent = SCTP_DATAGRAM_RESEND; 3289 sctp_stop_all_cookie_timers(stcb); 3290 } 3291 } 3292 break; 3293 case SCTP_COOKIE_ACK: 3294 sctp_send_cookie_ack(stcb); 3295 break; 3296 case SCTP_ASCONF_ACK: 3297 /* resend last asconf ack */ 3298 sctp_send_asconf_ack(stcb); 3299 break; 3300 case SCTP_IFORWARD_CUM_TSN: 3301 case SCTP_FORWARD_CUM_TSN: 3302 send_forward_tsn(stcb, &stcb->asoc); 3303 break; 3304 /* can't do anything with these */ 3305 case SCTP_PACKET_DROPPED: 3306 case SCTP_INITIATION_ACK: /* this should not happen */ 3307 case SCTP_HEARTBEAT_ACK: 3308 case SCTP_ABORT_ASSOCIATION: 3309 case SCTP_OPERATION_ERROR: 3310 case SCTP_SHUTDOWN_COMPLETE: 3311 case SCTP_ECN_ECHO: 3312 case SCTP_ECN_CWR: 3313 default: 3314 break; 3315 } 3316 return (0); 3317} 3318 3319void 3320sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3321{ 3322 uint32_t i; 3323 uint16_t temp; 3324 3325 /* 3326 * We set things to 0xffffffff since this is the last delivered 3327 * sequence and we will be sending in 0 after the reset. 3328 */ 3329 3330 if (number_entries) { 3331 for (i = 0; i < number_entries; i++) { 3332 temp = ntohs(list[i]); 3333 if (temp >= stcb->asoc.streamincnt) { 3334 continue; 3335 } 3336 stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff; 3337 } 3338 } else { 3339 list = NULL; 3340 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3341 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3342 } 3343 } 3344 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3345} 3346 3347static void 3348sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3349{ 3350 uint32_t i; 3351 uint16_t temp; 3352 3353 if (number_entries > 0) { 3354 for (i = 0; i < number_entries; i++) { 3355 temp = ntohs(list[i]); 3356 if (temp >= stcb->asoc.streamoutcnt) { 3357 /* no such stream */ 3358 continue; 3359 } 3360 stcb->asoc.strmout[temp].next_mid_ordered = 0; 3361 stcb->asoc.strmout[temp].next_mid_unordered = 0; 3362 } 3363 } else { 3364 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3365 stcb->asoc.strmout[i].next_mid_ordered = 0; 3366 stcb->asoc.strmout[i].next_mid_unordered = 0; 3367 } 3368 } 3369 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3370} 3371 3372static void 3373sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3374{ 3375 uint32_t i; 3376 uint16_t temp; 3377 3378 if (number_entries > 0) { 3379 for (i = 0; i < number_entries; i++) { 3380 temp = ntohs(list[i]); 3381 if (temp >= stcb->asoc.streamoutcnt) { 3382 /* no such stream */ 3383 continue; 3384 } 3385 stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN; 3386 } 3387 } else { 3388 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3389 stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN; 3390 } 3391 } 3392} 3393 3394struct sctp_stream_reset_request * 3395sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3396{ 3397 struct sctp_association *asoc; 3398 struct sctp_chunkhdr *ch; 3399 struct sctp_stream_reset_request *r; 3400 struct sctp_tmit_chunk *chk; 3401 int len, clen; 3402 3403 asoc = &stcb->asoc; 3404 chk = asoc->str_reset; 3405 if (TAILQ_EMPTY(&asoc->control_send_queue) || 3406 (chk == NULL)) { 3407 asoc->stream_reset_outstanding = 0; 3408 return (NULL); 3409 } 3410 if (chk->data == NULL) { 3411 return (NULL); 3412 } 3413 if (bchk != NULL) { 3414 /* he wants a copy of the chk pointer */ 3415 *bchk = chk; 3416 } 3417 clen = chk->send_size; 3418 ch = mtod(chk->data, struct sctp_chunkhdr *); 3419 r = (struct sctp_stream_reset_request *)(ch + 1); 3420 if (ntohl(r->request_seq) == seq) { 3421 /* found it */ 3422 return (r); 3423 } 3424 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3425 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3426 /* move to the next one, there can only be a max of two */ 3427 r = (struct sctp_stream_reset_request *)((caddr_t)r + len); 3428 if (ntohl(r->request_seq) == seq) { 3429 return (r); 3430 } 3431 } 3432 /* that seq is not here */ 3433 return (NULL); 3434} 3435 3436static void 3437sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3438{ 3439 struct sctp_association *asoc; 3440 struct sctp_tmit_chunk *chk; 3441 3442 asoc = &stcb->asoc; 3443 chk = asoc->str_reset; 3444 if (chk == NULL) { 3445 return; 3446 } 3447 asoc->str_reset = NULL; 3448 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, 3449 NULL, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28); 3450 TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next); 3451 asoc->ctrl_queue_cnt--; 3452 if (chk->data) { 3453 sctp_m_freem(chk->data); 3454 chk->data = NULL; 3455 } 3456 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3457} 3458 3459static int 3460sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3461 uint32_t seq, uint32_t action, 3462 struct sctp_stream_reset_response *respin) 3463{ 3464 uint16_t type; 3465 int lparam_len; 3466 struct sctp_association *asoc = &stcb->asoc; 3467 struct sctp_tmit_chunk *chk; 3468 struct sctp_stream_reset_request *req_param; 3469 struct sctp_stream_reset_out_request *req_out_param; 3470 struct sctp_stream_reset_in_request *req_in_param; 3471 uint32_t number_entries; 3472 3473 if (asoc->stream_reset_outstanding == 0) { 3474 /* duplicate */ 3475 return (0); 3476 } 3477 if (seq == stcb->asoc.str_reset_seq_out) { 3478 req_param = sctp_find_stream_reset(stcb, seq, &chk); 3479 if (req_param != NULL) { 3480 stcb->asoc.str_reset_seq_out++; 3481 type = ntohs(req_param->ph.param_type); 3482 lparam_len = ntohs(req_param->ph.param_length); 3483 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3484 int no_clear = 0; 3485 3486 req_out_param = (struct sctp_stream_reset_out_request *)req_param; 3487 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3488 asoc->stream_reset_out_is_outstanding = 0; 3489 if (asoc->stream_reset_outstanding) 3490 asoc->stream_reset_outstanding--; 3491 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3492 /* do it */ 3493 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); 3494 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3495 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3496 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) { 3497 /* 3498 * Set it up so we don't stop 3499 * retransmitting 3500 */ 3501 asoc->stream_reset_outstanding++; 3502 stcb->asoc.str_reset_seq_out--; 3503 asoc->stream_reset_out_is_outstanding = 1; 3504 no_clear = 1; 3505 } else { 3506 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3507 } 3508 if (no_clear == 0) { 3509 sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams); 3510 } 3511 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3512 req_in_param = (struct sctp_stream_reset_in_request *)req_param; 3513 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3514 if (asoc->stream_reset_outstanding) 3515 asoc->stream_reset_outstanding--; 3516 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3517 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3518 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3519 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3520 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3521 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3522 } 3523 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3524 /* Ok we now may have more streams */ 3525 int num_stream; 3526 3527 num_stream = stcb->asoc.strm_pending_add_size; 3528 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3529 /* TSNH */ 3530 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3531 } 3532 stcb->asoc.strm_pending_add_size = 0; 3533 if (asoc->stream_reset_outstanding) 3534 asoc->stream_reset_outstanding--; 3535 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3536 /* Put the new streams into effect */ 3537 int i; 3538 3539 for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) { 3540 asoc->strmout[i].state = SCTP_STREAM_OPEN; 3541 } 3542 asoc->streamoutcnt += num_stream; 3543 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3544 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3545 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3546 SCTP_STREAM_CHANGE_DENIED); 3547 } else { 3548 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3549 SCTP_STREAM_CHANGE_FAILED); 3550 } 3551 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3552 if (asoc->stream_reset_outstanding) 3553 asoc->stream_reset_outstanding--; 3554 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3555 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3556 SCTP_STREAM_CHANGE_DENIED); 3557 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3558 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3559 SCTP_STREAM_CHANGE_FAILED); 3560 } 3561 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3562 /** 3563 * a) Adopt the new in tsn. 3564 * b) reset the map 3565 * c) Adopt the new out-tsn 3566 */ 3567 struct sctp_stream_reset_response_tsn *resp; 3568 struct sctp_forward_tsn_chunk fwdtsn; 3569 int abort_flag = 0; 3570 3571 if (respin == NULL) { 3572 /* huh ? */ 3573 return (0); 3574 } 3575 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { 3576 return (0); 3577 } 3578 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3579 resp = (struct sctp_stream_reset_response_tsn *)respin; 3580 asoc->stream_reset_outstanding--; 3581 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3582 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3583 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3584 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3585 if (abort_flag) { 3586 return (1); 3587 } 3588 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3589 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3590 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3591 } 3592 3593 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3594 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3595 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3596 3597 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3598 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3599 3600 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3601 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3602 3603 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3604 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3605 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3606 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3607 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3608 SCTP_ASSOC_RESET_DENIED); 3609 } else { 3610 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3611 SCTP_ASSOC_RESET_FAILED); 3612 } 3613 } 3614 /* get rid of the request and get the request flags */ 3615 if (asoc->stream_reset_outstanding == 0) { 3616 sctp_clean_up_stream_reset(stcb); 3617 } 3618 } 3619 } 3620 if (asoc->stream_reset_outstanding == 0) { 3621 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3622 } 3623 return (0); 3624} 3625 3626static void 3627sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3628 struct sctp_tmit_chunk *chk, 3629 struct sctp_stream_reset_in_request *req, int trunc) 3630{ 3631 uint32_t seq; 3632 int len, i; 3633 int number_entries; 3634 uint16_t temp; 3635 3636 /* 3637 * peer wants me to send a str-reset to him for my outgoing seq's if 3638 * seq_in is right. 3639 */ 3640 struct sctp_association *asoc = &stcb->asoc; 3641 3642 seq = ntohl(req->request_seq); 3643 if (asoc->str_reset_seq_in == seq) { 3644 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3645 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3646 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3647 } else if (trunc) { 3648 /* Can't do it, since they exceeded our buffer size */ 3649 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3650 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3651 len = ntohs(req->ph.param_length); 3652 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3653 if (number_entries) { 3654 for (i = 0; i < number_entries; i++) { 3655 temp = ntohs(req->list_of_streams[i]); 3656 if (temp >= stcb->asoc.streamoutcnt) { 3657 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3658 goto bad_boy; 3659 } 3660 req->list_of_streams[i] = temp; 3661 } 3662 for (i = 0; i < number_entries; i++) { 3663 if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) { 3664 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING; 3665 } 3666 } 3667 } else { 3668 /* Its all */ 3669 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3670 if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN) 3671 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING; 3672 } 3673 } 3674 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3675 } else { 3676 /* Can't do it, since we have sent one out */ 3677 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3678 } 3679bad_boy: 3680 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3681 asoc->str_reset_seq_in++; 3682 } else if (asoc->str_reset_seq_in - 1 == seq) { 3683 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3684 } else if (asoc->str_reset_seq_in - 2 == seq) { 3685 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3686 } else { 3687 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3688 } 3689 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3690} 3691 3692static int 3693sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3694 struct sctp_tmit_chunk *chk, 3695 struct sctp_stream_reset_tsn_request *req) 3696{ 3697 /* reset all in and out and update the tsn */ 3698 /* 3699 * A) reset my str-seq's on in and out. B) Select a receive next, 3700 * and set cum-ack to it. Also process this selected number as a 3701 * fwd-tsn as well. C) set in the response my next sending seq. 3702 */ 3703 struct sctp_forward_tsn_chunk fwdtsn; 3704 struct sctp_association *asoc = &stcb->asoc; 3705 int abort_flag = 0; 3706 uint32_t seq; 3707 3708 seq = ntohl(req->request_seq); 3709 if (asoc->str_reset_seq_in == seq) { 3710 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3711 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3712 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3713 } else { 3714 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3715 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3716 fwdtsn.ch.chunk_flags = 0; 3717 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3718 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3719 if (abort_flag) { 3720 return (1); 3721 } 3722 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3723 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3724 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3725 } 3726 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3727 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3728 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3729 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3730 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3731 atomic_add_int(&asoc->sending_seq, 1); 3732 /* save off historical data for retrans */ 3733 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3734 asoc->last_sending_seq[0] = asoc->sending_seq; 3735 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3736 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3737 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3738 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3739 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3740 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3741 } 3742 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3743 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3744 asoc->str_reset_seq_in++; 3745 } else if (asoc->str_reset_seq_in - 1 == seq) { 3746 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3747 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3748 } else if (asoc->str_reset_seq_in - 2 == seq) { 3749 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3750 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3751 } else { 3752 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3753 } 3754 return (0); 3755} 3756 3757static void 3758sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3759 struct sctp_tmit_chunk *chk, 3760 struct sctp_stream_reset_out_request *req, int trunc) 3761{ 3762 uint32_t seq, tsn; 3763 int number_entries, len; 3764 struct sctp_association *asoc = &stcb->asoc; 3765 3766 seq = ntohl(req->request_seq); 3767 3768 /* now if its not a duplicate we process it */ 3769 if (asoc->str_reset_seq_in == seq) { 3770 len = ntohs(req->ph.param_length); 3771 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3772 /* 3773 * the sender is resetting, handle the list issue.. we must 3774 * a) verify if we can do the reset, if so no problem b) If 3775 * we can't do the reset we must copy the request. c) queue 3776 * it, and setup the data in processor to trigger it off 3777 * when needed and dequeue all the queued data. 3778 */ 3779 tsn = ntohl(req->send_reset_at_tsn); 3780 3781 /* move the reset action back one */ 3782 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3783 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3784 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3785 } else if (trunc) { 3786 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3787 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3788 /* we can do it now */ 3789 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3790 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3791 } else { 3792 /* 3793 * we must queue it up and thus wait for the TSN's 3794 * to arrive that are at or before tsn 3795 */ 3796 struct sctp_stream_reset_list *liste; 3797 int siz; 3798 3799 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3800 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3801 siz, SCTP_M_STRESET); 3802 if (liste == NULL) { 3803 /* gak out of memory */ 3804 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3805 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3806 return; 3807 } 3808 liste->seq = seq; 3809 liste->tsn = tsn; 3810 liste->number_entries = number_entries; 3811 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 3812 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3813 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS; 3814 } 3815 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3816 asoc->str_reset_seq_in++; 3817 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3818 /* 3819 * one seq back, just echo back last action since my 3820 * response was lost. 3821 */ 3822 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3823 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3824 /* 3825 * two seq back, just echo back last action since my 3826 * response was lost. 3827 */ 3828 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3829 } else { 3830 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3831 } 3832} 3833 3834static void 3835sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3836 struct sctp_stream_reset_add_strm *str_add) 3837{ 3838 /* 3839 * Peer is requesting to add more streams. If its within our 3840 * max-streams we will allow it. 3841 */ 3842 uint32_t num_stream, i; 3843 uint32_t seq; 3844 struct sctp_association *asoc = &stcb->asoc; 3845 struct sctp_queued_to_read *ctl, *nctl; 3846 3847 /* Get the number. */ 3848 seq = ntohl(str_add->request_seq); 3849 num_stream = ntohs(str_add->number_of_streams); 3850 /* Now what would be the new total? */ 3851 if (asoc->str_reset_seq_in == seq) { 3852 num_stream += stcb->asoc.streamincnt; 3853 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3854 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3855 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3856 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 3857 (num_stream > 0xffff)) { 3858 /* We must reject it they ask for to many */ 3859 denied: 3860 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3861 } else { 3862 /* Ok, we can do that :-) */ 3863 struct sctp_stream_in *oldstrm; 3864 3865 /* save off the old */ 3866 oldstrm = stcb->asoc.strmin; 3867 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3868 (num_stream * sizeof(struct sctp_stream_in)), 3869 SCTP_M_STRMI); 3870 if (stcb->asoc.strmin == NULL) { 3871 stcb->asoc.strmin = oldstrm; 3872 goto denied; 3873 } 3874 /* copy off the old data */ 3875 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3876 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3877 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 3878 stcb->asoc.strmin[i].sid = i; 3879 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered; 3880 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 3881 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started; 3882 /* now anything on those queues? */ 3883 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) { 3884 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm); 3885 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm); 3886 } 3887 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) { 3888 TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm); 3889 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm); 3890 } 3891 } 3892 /* Init the new streams */ 3893 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3894 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3895 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 3896 stcb->asoc.strmin[i].sid = i; 3897 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3898 stcb->asoc.strmin[i].pd_api_started = 0; 3899 stcb->asoc.strmin[i].delivery_started = 0; 3900 } 3901 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3902 /* update the size */ 3903 stcb->asoc.streamincnt = num_stream; 3904 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3905 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3906 } 3907 sctp_add_stream_reset_result(chk, seq, 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 3926static void 3927sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3928 struct sctp_stream_reset_add_strm *str_add) 3929{ 3930 /* 3931 * Peer is requesting to add more streams. If its within our 3932 * max-streams we will allow it. 3933 */ 3934 uint16_t num_stream; 3935 uint32_t seq; 3936 struct sctp_association *asoc = &stcb->asoc; 3937 3938 /* Get the number. */ 3939 seq = ntohl(str_add->request_seq); 3940 num_stream = ntohs(str_add->number_of_streams); 3941 /* Now what would be the new total? */ 3942 if (asoc->str_reset_seq_in == seq) { 3943 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3944 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3945 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3946 } else if (stcb->asoc.stream_reset_outstanding) { 3947 /* We must reject it we have something pending */ 3948 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3949 } else { 3950 /* Ok, we can do that :-) */ 3951 int mychk; 3952 3953 mychk = stcb->asoc.streamoutcnt; 3954 mychk += num_stream; 3955 if (mychk < 0x10000) { 3956 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3957 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) { 3958 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3959 } 3960 } else { 3961 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3962 } 3963 } 3964 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 3965 asoc->str_reset_seq_in++; 3966 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3967 /* 3968 * one seq back, just echo back last action since my 3969 * response was lost. 3970 */ 3971 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3972 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3973 /* 3974 * two seq back, just echo back last action since my 3975 * response was lost. 3976 */ 3977 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3978 } else { 3979 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3980 } 3981} 3982 3983#ifdef __GNUC__ 3984__attribute__((noinline)) 3985#endif 3986static int 3987sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 3988 struct sctp_chunkhdr *ch_req) 3989{ 3990 uint16_t remaining_length, param_len, ptype; 3991 struct sctp_paramhdr pstore; 3992 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 3993 uint32_t seq = 0; 3994 int num_req = 0; 3995 int trunc = 0; 3996 struct sctp_tmit_chunk *chk; 3997 struct sctp_chunkhdr *ch; 3998 struct sctp_paramhdr *ph; 3999 int ret_code = 0; 4000 int num_param = 0; 4001 4002 /* now it may be a reset or a reset-response */ 4003 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr); 4004 4005 /* setup for adding the response */ 4006 sctp_alloc_a_chunk(stcb, chk); 4007 if (chk == NULL) { 4008 return (ret_code); 4009 } 4010 chk->copy_by_ref = 0; 4011 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 4012 chk->rec.chunk_id.can_take_data = 0; 4013 chk->flags = 0; 4014 chk->asoc = &stcb->asoc; 4015 chk->no_fr_allowed = 0; 4016 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 4017 chk->book_size_scale = 0; 4018 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 4019 if (chk->data == NULL) { 4020strres_nochunk: 4021 if (chk->data) { 4022 sctp_m_freem(chk->data); 4023 chk->data = NULL; 4024 } 4025 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4026 return (ret_code); 4027 } 4028 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4029 4030 /* setup chunk parameters */ 4031 chk->sent = SCTP_DATAGRAM_UNSENT; 4032 chk->snd_count = 0; 4033 chk->whoTo = NULL; 4034 4035 ch = mtod(chk->data, struct sctp_chunkhdr *); 4036 ch->chunk_type = SCTP_STREAM_RESET; 4037 ch->chunk_flags = 0; 4038 ch->chunk_length = htons(chk->send_size); 4039 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4040 offset += sizeof(struct sctp_chunkhdr); 4041 while (remaining_length >= sizeof(struct sctp_paramhdr)) { 4042 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore); 4043 if (ph == NULL) { 4044 /* TSNH */ 4045 break; 4046 } 4047 param_len = ntohs(ph->param_length); 4048 if ((param_len > remaining_length) || 4049 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) { 4050 /* bad parameter length */ 4051 break; 4052 } 4053 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)), 4054 (uint8_t *)&cstore); 4055 if (ph == NULL) { 4056 /* TSNH */ 4057 break; 4058 } 4059 ptype = ntohs(ph->param_type); 4060 num_param++; 4061 if (param_len > sizeof(cstore)) { 4062 trunc = 1; 4063 } else { 4064 trunc = 0; 4065 } 4066 if (num_param > SCTP_MAX_RESET_PARAMS) { 4067 /* hit the max of parameters already sorry.. */ 4068 break; 4069 } 4070 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4071 struct sctp_stream_reset_out_request *req_out; 4072 4073 if (param_len < sizeof(struct sctp_stream_reset_out_request)) { 4074 break; 4075 } 4076 req_out = (struct sctp_stream_reset_out_request *)ph; 4077 num_req++; 4078 if (stcb->asoc.stream_reset_outstanding) { 4079 seq = ntohl(req_out->response_seq); 4080 if (seq == stcb->asoc.str_reset_seq_out) { 4081 /* implicit ack */ 4082 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4083 } 4084 } 4085 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4086 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4087 struct sctp_stream_reset_add_strm *str_add; 4088 4089 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4090 break; 4091 } 4092 str_add = (struct sctp_stream_reset_add_strm *)ph; 4093 num_req++; 4094 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4095 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4096 struct sctp_stream_reset_add_strm *str_add; 4097 4098 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4099 break; 4100 } 4101 str_add = (struct sctp_stream_reset_add_strm *)ph; 4102 num_req++; 4103 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4104 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4105 struct sctp_stream_reset_in_request *req_in; 4106 4107 num_req++; 4108 req_in = (struct sctp_stream_reset_in_request *)ph; 4109 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4110 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4111 struct sctp_stream_reset_tsn_request *req_tsn; 4112 4113 num_req++; 4114 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4115 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4116 ret_code = 1; 4117 goto strres_nochunk; 4118 } 4119 /* no more */ 4120 break; 4121 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4122 struct sctp_stream_reset_response *resp; 4123 uint32_t result; 4124 4125 if (param_len < sizeof(struct sctp_stream_reset_response)) { 4126 break; 4127 } 4128 resp = (struct sctp_stream_reset_response *)ph; 4129 seq = ntohl(resp->response_seq); 4130 result = ntohl(resp->result); 4131 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4132 ret_code = 1; 4133 goto strres_nochunk; 4134 } 4135 } else { 4136 break; 4137 } 4138 offset += SCTP_SIZE32(param_len); 4139 if (remaining_length >= SCTP_SIZE32(param_len)) { 4140 remaining_length -= SCTP_SIZE32(param_len); 4141 } else { 4142 remaining_length = 0; 4143 } 4144 } 4145 if (num_req == 0) { 4146 /* we have no response free the stuff */ 4147 goto strres_nochunk; 4148 } 4149 /* ok we have a chunk to link in */ 4150 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4151 chk, 4152 sctp_next); 4153 stcb->asoc.ctrl_queue_cnt++; 4154 return (ret_code); 4155} 4156 4157/* 4158 * Handle a router or endpoints report of a packet loss, there are two ways 4159 * to handle this, either we get the whole packet and must disect it 4160 * ourselves (possibly with truncation and or corruption) or it is a summary 4161 * from a middle box that did the disectting for us. 4162 */ 4163static void 4164sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4165 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4166{ 4167 struct sctp_chunk_desc desc; 4168 struct sctp_chunkhdr *chk_hdr; 4169 struct sctp_data_chunk *data_chunk; 4170 struct sctp_idata_chunk *idata_chunk; 4171 uint32_t bottle_bw, on_queue; 4172 uint32_t offset, chk_len; 4173 uint16_t pktdrp_len; 4174 uint8_t pktdrp_flags; 4175 4176 KASSERT(sizeof(struct sctp_pktdrop_chunk) <= limit, 4177 ("PKTDROP chunk too small")); 4178 pktdrp_flags = cp->ch.chunk_flags; 4179 pktdrp_len = ntohs(cp->ch.chunk_length); 4180 KASSERT(limit <= pktdrp_len, ("Inconsistent limit")); 4181 if (pktdrp_flags & SCTP_PACKET_TRUNCATED) { 4182 if (ntohs(cp->trunc_len) <= pktdrp_len - sizeof(struct sctp_pktdrop_chunk)) { 4183 /* The peer plays games with us. */ 4184 return; 4185 } 4186 } 4187 limit -= sizeof(struct sctp_pktdrop_chunk); 4188 offset = 0; 4189 if (offset == limit) { 4190 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4191 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4192 } 4193 } else if (offset + sizeof(struct sctphdr) > limit) { 4194 /* Only a partial SCTP common header. */ 4195 SCTP_STAT_INCR(sctps_pdrpcrupt); 4196 offset = limit; 4197 } else { 4198 /* XXX: Check embedded SCTP common header. */ 4199 offset += sizeof(struct sctphdr); 4200 } 4201 /* Now parse through the chunks themselves. */ 4202 while (offset < limit) { 4203 if (offset + sizeof(struct sctp_chunkhdr) > limit) { 4204 SCTP_STAT_INCR(sctps_pdrpcrupt); 4205 break; 4206 } 4207 chk_hdr = (struct sctp_chunkhdr *)(cp->data + offset); 4208 desc.chunk_type = chk_hdr->chunk_type; 4209 /* get amount we need to move */ 4210 chk_len = (uint32_t)ntohs(chk_hdr->chunk_length); 4211 if (chk_len < sizeof(struct sctp_chunkhdr)) { 4212 /* Someone is lying... */ 4213 break; 4214 } 4215 if (desc.chunk_type == SCTP_DATA) { 4216 if (stcb->asoc.idata_supported) { 4217 /* Some is playing games with us. */ 4218 break; 4219 } 4220 if (chk_len <= sizeof(struct sctp_data_chunk)) { 4221 /* Some is playing games with us. */ 4222 break; 4223 } 4224 if (chk_len < sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY) { 4225 /* 4226 * Not enough data bytes available in the 4227 * chunk. 4228 */ 4229 SCTP_STAT_INCR(sctps_pdrpnedat); 4230 goto next_chunk; 4231 } 4232 if (offset + sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) { 4233 /* Not enough data in buffer. */ 4234 break; 4235 } 4236 data_chunk = (struct sctp_data_chunk *)(cp->data + offset); 4237 memcpy(desc.data_bytes, data_chunk + 1, SCTP_NUM_DB_TO_VERIFY); 4238 desc.tsn_ifany = data_chunk->dp.tsn; 4239 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4240 SCTP_STAT_INCR(sctps_pdrpmbda); 4241 } 4242 } else if (desc.chunk_type == SCTP_IDATA) { 4243 if (!stcb->asoc.idata_supported) { 4244 /* Some is playing games with us. */ 4245 break; 4246 } 4247 if (chk_len <= sizeof(struct sctp_idata_chunk)) { 4248 /* Some is playing games with us. */ 4249 break; 4250 } 4251 if (chk_len < sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY) { 4252 /* 4253 * Not enough data bytes available in the 4254 * chunk. 4255 */ 4256 SCTP_STAT_INCR(sctps_pdrpnedat); 4257 goto next_chunk; 4258 } 4259 if (offset + sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) { 4260 /* Not enough data in buffer. */ 4261 break; 4262 } 4263 idata_chunk = (struct sctp_idata_chunk *)(cp->data + offset); 4264 memcpy(desc.data_bytes, idata_chunk + 1, SCTP_NUM_DB_TO_VERIFY); 4265 desc.tsn_ifany = idata_chunk->dp.tsn; 4266 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4267 SCTP_STAT_INCR(sctps_pdrpmbda); 4268 } 4269 } else { 4270 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4271 SCTP_STAT_INCR(sctps_pdrpmbct); 4272 } 4273 } 4274 if (process_chunk_drop(stcb, &desc, net, pktdrp_flags)) { 4275 SCTP_STAT_INCR(sctps_pdrppdbrk); 4276 break; 4277 } 4278next_chunk: 4279 offset += SCTP_SIZE32(chk_len); 4280 } 4281 /* Now update any rwnd --- possibly */ 4282 if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4283 /* From a peer, we get a rwnd report */ 4284 uint32_t a_rwnd; 4285 4286 SCTP_STAT_INCR(sctps_pdrpfehos); 4287 4288 bottle_bw = ntohl(cp->bottle_bw); 4289 on_queue = ntohl(cp->current_onq); 4290 if (bottle_bw && on_queue) { 4291 /* a rwnd report is in here */ 4292 if (bottle_bw > on_queue) 4293 a_rwnd = bottle_bw - on_queue; 4294 else 4295 a_rwnd = 0; 4296 4297 if (a_rwnd == 0) 4298 stcb->asoc.peers_rwnd = 0; 4299 else { 4300 if (a_rwnd > stcb->asoc.total_flight) { 4301 stcb->asoc.peers_rwnd = 4302 a_rwnd - stcb->asoc.total_flight; 4303 } else { 4304 stcb->asoc.peers_rwnd = 0; 4305 } 4306 if (stcb->asoc.peers_rwnd < 4307 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4308 /* SWS sender side engages */ 4309 stcb->asoc.peers_rwnd = 0; 4310 } 4311 } 4312 } 4313 } else { 4314 SCTP_STAT_INCR(sctps_pdrpfmbox); 4315 } 4316 4317 /* now middle boxes in sat networks get a cwnd bump */ 4318 if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) && 4319 (stcb->asoc.sat_t3_loss_recovery == 0) && 4320 (stcb->asoc.sat_network)) { 4321 /* 4322 * This is debatable but for sat networks it makes sense 4323 * Note if a T3 timer has went off, we will prohibit any 4324 * changes to cwnd until we exit the t3 loss recovery. 4325 */ 4326 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4327 net, cp, &bottle_bw, &on_queue); 4328 } 4329} 4330 4331/* 4332 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4333 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4334 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4335 * length of the complete packet outputs: - length: modified to remaining 4336 * length after control processing - netp: modified to new sctp_nets after 4337 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4338 * bad packet,...) otherwise return the tcb for this packet 4339 */ 4340#ifdef __GNUC__ 4341__attribute__((noinline)) 4342#endif 4343static struct sctp_tcb * 4344sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4345 struct sockaddr *src, struct sockaddr *dst, 4346 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4347 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4348 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 4349 uint32_t vrf_id, uint16_t port) 4350{ 4351 struct sctp_association *asoc; 4352 struct mbuf *op_err; 4353 char msg[SCTP_DIAG_INFO_LEN]; 4354 uint32_t vtag_in; 4355 int num_chunks = 0; /* number of control chunks processed */ 4356 uint32_t chk_length, contiguous; 4357 int ret; 4358 int abort_no_unlock = 0; 4359 int ecne_seen = 0; 4360 int abort_flag; 4361 4362 /* 4363 * How big should this be, and should it be alloc'd? Lets try the 4364 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4365 * until we get into jumbo grams and such.. 4366 */ 4367 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4368 int got_auth = 0; 4369 uint32_t auth_offset = 0, auth_len = 0; 4370 int auth_skipped = 0; 4371 int asconf_cnt = 0; 4372 4373 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4374 iphlen, *offset, length, (void *)stcb); 4375 4376 if (stcb) { 4377 SCTP_TCB_LOCK_ASSERT(stcb); 4378 } 4379 /* validate chunk header length... */ 4380 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4381 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4382 ntohs(ch->chunk_length)); 4383 *offset = length; 4384 return (stcb); 4385 } 4386 /* 4387 * validate the verification tag 4388 */ 4389 vtag_in = ntohl(sh->v_tag); 4390 4391 if (ch->chunk_type == SCTP_INITIATION) { 4392 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4393 ntohs(ch->chunk_length), vtag_in); 4394 if (vtag_in != 0) { 4395 /* protocol error- silently discard... */ 4396 SCTP_STAT_INCR(sctps_badvtag); 4397 if (stcb != NULL) { 4398 SCTP_TCB_UNLOCK(stcb); 4399 } 4400 return (NULL); 4401 } 4402 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4403 /* 4404 * If there is no stcb, skip the AUTH chunk and process 4405 * later after a stcb is found (to validate the lookup was 4406 * valid. 4407 */ 4408 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4409 (stcb == NULL) && 4410 (inp->auth_supported == 1)) { 4411 /* save this chunk for later processing */ 4412 auth_skipped = 1; 4413 auth_offset = *offset; 4414 auth_len = ntohs(ch->chunk_length); 4415 4416 /* (temporarily) move past this chunk */ 4417 *offset += SCTP_SIZE32(auth_len); 4418 if (*offset >= length) { 4419 /* no more data left in the mbuf chain */ 4420 *offset = length; 4421 return (NULL); 4422 } 4423 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4424 sizeof(struct sctp_chunkhdr), chunk_buf); 4425 } 4426 if (ch == NULL) { 4427 /* Help */ 4428 *offset = length; 4429 return (stcb); 4430 } 4431 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4432 goto process_control_chunks; 4433 } 4434 /* 4435 * first check if it's an ASCONF with an unknown src addr we 4436 * need to look inside to find the association 4437 */ 4438 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4439 struct sctp_chunkhdr *asconf_ch = ch; 4440 uint32_t asconf_offset = 0, asconf_len = 0; 4441 4442 /* inp's refcount may be reduced */ 4443 SCTP_INP_INCR_REF(inp); 4444 4445 asconf_offset = *offset; 4446 do { 4447 asconf_len = ntohs(asconf_ch->chunk_length); 4448 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4449 break; 4450 stcb = sctp_findassociation_ep_asconf(m, 4451 *offset, 4452 dst, 4453 sh, &inp, netp, vrf_id); 4454 if (stcb != NULL) 4455 break; 4456 asconf_offset += SCTP_SIZE32(asconf_len); 4457 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4458 sizeof(struct sctp_chunkhdr), chunk_buf); 4459 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4460 if (stcb == NULL) { 4461 /* 4462 * reduce inp's refcount if not reduced in 4463 * sctp_findassociation_ep_asconf(). 4464 */ 4465 SCTP_INP_DECR_REF(inp); 4466 } 4467 4468 /* now go back and verify any auth chunk to be sure */ 4469 if (auth_skipped && (stcb != NULL)) { 4470 struct sctp_auth_chunk *auth; 4471 4472 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) { 4473 auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, chunk_buf); 4474 got_auth = 1; 4475 auth_skipped = 0; 4476 } else { 4477 auth = NULL; 4478 } 4479 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4480 auth_offset)) { 4481 /* auth HMAC failed so dump it */ 4482 *offset = length; 4483 return (stcb); 4484 } else { 4485 /* remaining chunks are HMAC checked */ 4486 stcb->asoc.authenticated = 1; 4487 } 4488 } 4489 } 4490 if (stcb == NULL) { 4491 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4492 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4493 msg); 4494 /* no association, so it's out of the blue... */ 4495 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4496 mflowtype, mflowid, inp->fibnum, 4497 vrf_id, port); 4498 *offset = length; 4499 return (NULL); 4500 } 4501 asoc = &stcb->asoc; 4502 /* ABORT and SHUTDOWN can use either v_tag... */ 4503 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4504 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4505 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4506 /* Take the T-bit always into account. */ 4507 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4508 (vtag_in == asoc->my_vtag)) || 4509 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4510 (asoc->peer_vtag != htonl(0)) && 4511 (vtag_in == asoc->peer_vtag))) { 4512 /* this is valid */ 4513 } else { 4514 /* drop this packet... */ 4515 SCTP_STAT_INCR(sctps_badvtag); 4516 if (stcb != NULL) { 4517 SCTP_TCB_UNLOCK(stcb); 4518 } 4519 return (NULL); 4520 } 4521 } else { 4522 /* for all other chunks, vtag must match */ 4523 if (vtag_in != asoc->my_vtag) { 4524 /* invalid vtag... */ 4525 SCTPDBG(SCTP_DEBUG_INPUT3, 4526 "invalid vtag: %xh, expect %xh\n", 4527 vtag_in, asoc->my_vtag); 4528 SCTP_STAT_INCR(sctps_badvtag); 4529 if (stcb != NULL) { 4530 SCTP_TCB_UNLOCK(stcb); 4531 } 4532 *offset = length; 4533 return (NULL); 4534 } 4535 } 4536 } /* end if !SCTP_COOKIE_ECHO */ 4537 /* 4538 * process all control chunks... 4539 */ 4540 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4541 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4542 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4543 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 4544 /* implied cookie-ack.. we must have lost the ack */ 4545 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4546 *netp); 4547 } 4548 4549process_control_chunks: 4550 while (IS_SCTP_CONTROL(ch)) { 4551 /* validate chunk length */ 4552 chk_length = ntohs(ch->chunk_length); 4553 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4554 ch->chunk_type, chk_length); 4555 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4556 if (chk_length < sizeof(*ch) || 4557 (*offset + (int)chk_length) > length) { 4558 *offset = length; 4559 return (stcb); 4560 } 4561 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4562 /* 4563 * INIT and INIT-ACK only gets the init ack "header" portion 4564 * only because we don't have to process the peer's COOKIE. 4565 * All others get a complete chunk. 4566 */ 4567 switch (ch->chunk_type) { 4568 case SCTP_INITIATION: 4569 contiguous = sizeof(struct sctp_init_chunk); 4570 break; 4571 case SCTP_INITIATION_ACK: 4572 contiguous = sizeof(struct sctp_init_ack_chunk); 4573 break; 4574 default: 4575 contiguous = min(chk_length, sizeof(chunk_buf)); 4576 break; 4577 } 4578 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4579 contiguous, 4580 chunk_buf); 4581 if (ch == NULL) { 4582 *offset = length; 4583 return (stcb); 4584 } 4585 4586 num_chunks++; 4587 /* Save off the last place we got a control from */ 4588 if (stcb != NULL) { 4589 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4590 /* 4591 * allow last_control to be NULL if 4592 * ASCONF... ASCONF processing will find the 4593 * right net later 4594 */ 4595 if ((netp != NULL) && (*netp != NULL)) 4596 stcb->asoc.last_control_chunk_from = *netp; 4597 } 4598 } 4599#ifdef SCTP_AUDITING_ENABLED 4600 sctp_audit_log(0xB0, ch->chunk_type); 4601#endif 4602 4603 /* check to see if this chunk required auth, but isn't */ 4604 if ((stcb != NULL) && 4605 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4606 !stcb->asoc.authenticated) { 4607 /* "silently" ignore */ 4608 SCTP_STAT_INCR(sctps_recvauthmissing); 4609 goto next_chunk; 4610 } 4611 switch (ch->chunk_type) { 4612 case SCTP_INITIATION: 4613 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4614 /* The INIT chunk must be the only chunk. */ 4615 if ((num_chunks > 1) || 4616 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4617 /* 4618 * RFC 4960bis requires stopping the 4619 * processing of the packet. 4620 */ 4621 *offset = length; 4622 return (stcb); 4623 } 4624 /* Honor our resource limit. */ 4625 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4626 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4627 sctp_abort_association(inp, stcb, m, iphlen, 4628 src, dst, sh, op_err, 4629 mflowtype, mflowid, 4630 vrf_id, port); 4631 *offset = length; 4632 return (NULL); 4633 } 4634 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4635 (struct sctp_init_chunk *)ch, inp, 4636 stcb, *netp, &abort_no_unlock, 4637 mflowtype, mflowid, 4638 vrf_id, port); 4639 *offset = length; 4640 if ((!abort_no_unlock) && (stcb != NULL)) { 4641 SCTP_TCB_UNLOCK(stcb); 4642 } 4643 return (NULL); 4644 break; 4645 case SCTP_PAD_CHUNK: 4646 break; 4647 case SCTP_INITIATION_ACK: 4648 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n"); 4649 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4650 /* We are not interested anymore */ 4651 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) { 4652 ; 4653 } else { 4654 *offset = length; 4655 if (stcb != NULL) { 4656 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4657 SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 4658 } 4659 return (NULL); 4660 } 4661 } 4662 /* The INIT-ACK chunk must be the only chunk. */ 4663 if ((num_chunks > 1) || 4664 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4665 *offset = length; 4666 return (stcb); 4667 } 4668 if ((netp != NULL) && (*netp != NULL)) { 4669 ret = sctp_handle_init_ack(m, iphlen, *offset, 4670 src, dst, sh, 4671 (struct sctp_init_ack_chunk *)ch, 4672 stcb, *netp, 4673 &abort_no_unlock, 4674 mflowtype, mflowid, 4675 vrf_id); 4676 } else { 4677 ret = -1; 4678 } 4679 *offset = length; 4680 if (abort_no_unlock) { 4681 return (NULL); 4682 } 4683 /* 4684 * Special case, I must call the output routine to 4685 * get the cookie echoed 4686 */ 4687 if ((stcb != NULL) && (ret == 0)) { 4688 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4689 } 4690 return (stcb); 4691 break; 4692 case SCTP_SELECTIVE_ACK: 4693 case SCTP_NR_SELECTIVE_ACK: 4694 { 4695 int abort_now = 0; 4696 uint32_t a_rwnd, cum_ack; 4697 uint16_t num_seg, num_nr_seg, num_dup; 4698 uint8_t flags; 4699 int offset_seg, offset_dup; 4700 4701 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n", 4702 ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK"); 4703 SCTP_STAT_INCR(sctps_recvsacks); 4704 if (stcb == NULL) { 4705 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n", 4706 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK"); 4707 break; 4708 } 4709 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4710 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4711 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4712 break; 4713 } 4714 } else { 4715 if (stcb->asoc.nrsack_supported == 0) { 4716 goto unknown_chunk; 4717 } 4718 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4719 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n"); 4720 break; 4721 } 4722 } 4723 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4724 /*- 4725 * If we have sent a shutdown-ack, we will pay no 4726 * attention to a sack sent in to us since 4727 * we don't care anymore. 4728 */ 4729 break; 4730 } 4731 flags = ch->chunk_flags; 4732 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4733 struct sctp_sack_chunk *sack; 4734 4735 sack = (struct sctp_sack_chunk *)ch; 4736 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4737 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4738 num_nr_seg = 0; 4739 num_dup = ntohs(sack->sack.num_dup_tsns); 4740 a_rwnd = ntohl(sack->sack.a_rwnd); 4741 if (sizeof(struct sctp_sack_chunk) + 4742 num_seg * sizeof(struct sctp_gap_ack_block) + 4743 num_dup * sizeof(uint32_t) != chk_length) { 4744 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4745 break; 4746 } 4747 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4748 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4749 } else { 4750 struct sctp_nr_sack_chunk *nr_sack; 4751 4752 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4753 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4754 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4755 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4756 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4757 a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd); 4758 if (sizeof(struct sctp_nr_sack_chunk) + 4759 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4760 num_dup * sizeof(uint32_t) != chk_length) { 4761 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4762 break; 4763 } 4764 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4765 offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block); 4766 } 4767 SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4768 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK", 4769 cum_ack, num_seg, a_rwnd); 4770 stcb->asoc.seen_a_sack_this_pkt = 1; 4771 if ((stcb->asoc.pr_sctp_cnt == 0) && 4772 (num_seg == 0) && (num_nr_seg == 0) && 4773 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4774 (stcb->asoc.saw_sack_with_frags == 0) && 4775 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4776 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 4777 /* 4778 * We have a SIMPLE sack having no 4779 * prior segments and data on sent 4780 * queue to be acked. Use the faster 4781 * path sack processing. We also 4782 * allow window update sacks with no 4783 * missing segments to go this way 4784 * too. 4785 */ 4786 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 4787 &abort_now, ecne_seen); 4788 } else { 4789 if ((netp != NULL) && (*netp != NULL)) { 4790 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4791 num_seg, num_nr_seg, num_dup, &abort_now, flags, 4792 cum_ack, a_rwnd, ecne_seen); 4793 } 4794 } 4795 if (abort_now) { 4796 /* ABORT signal from sack processing */ 4797 *offset = length; 4798 return (NULL); 4799 } 4800 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4801 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4802 (stcb->asoc.stream_queue_cnt == 0)) { 4803 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4804 } 4805 break; 4806 } 4807 case SCTP_HEARTBEAT_REQUEST: 4808 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 4809 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 4810 SCTP_STAT_INCR(sctps_recvheartbeat); 4811 sctp_send_heartbeat_ack(stcb, m, *offset, 4812 chk_length, *netp); 4813 } 4814 break; 4815 case SCTP_HEARTBEAT_ACK: 4816 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n"); 4817 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 4818 /* Its not ours */ 4819 break; 4820 } 4821 SCTP_STAT_INCR(sctps_recvheartbeatack); 4822 if ((netp != NULL) && (*netp != NULL)) { 4823 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 4824 stcb, *netp); 4825 } 4826 break; 4827 case SCTP_ABORT_ASSOCIATION: 4828 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 4829 (void *)stcb); 4830 *offset = length; 4831 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 4832 if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) { 4833 return (NULL); 4834 } else { 4835 return (stcb); 4836 } 4837 } else { 4838 return (NULL); 4839 } 4840 break; 4841 case SCTP_SHUTDOWN: 4842 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 4843 (void *)stcb); 4844 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 4845 break; 4846 } 4847 if ((netp != NULL) && (*netp != NULL)) { 4848 abort_flag = 0; 4849 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 4850 stcb, *netp, &abort_flag); 4851 if (abort_flag) { 4852 *offset = length; 4853 return (NULL); 4854 } 4855 } 4856 break; 4857 case SCTP_SHUTDOWN_ACK: 4858 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb); 4859 if ((chk_length == sizeof(struct sctp_shutdown_ack_chunk)) && 4860 (stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 4861 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 4862 *offset = length; 4863 return (NULL); 4864 } 4865 break; 4866 case SCTP_OPERATION_ERROR: 4867 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n"); 4868 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) && 4869 sctp_handle_error(ch, stcb, *netp, contiguous) < 0) { 4870 *offset = length; 4871 return (NULL); 4872 } 4873 break; 4874 case SCTP_COOKIE_ECHO: 4875 SCTPDBG(SCTP_DEBUG_INPUT3, 4876 "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb); 4877 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) { 4878 ; 4879 } else { 4880 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4881 /* We are not interested anymore */ 4882 abend: 4883 if (stcb != NULL) { 4884 SCTP_TCB_UNLOCK(stcb); 4885 } 4886 *offset = length; 4887 return (NULL); 4888 } 4889 } 4890 /*- 4891 * First are we accepting? We do this again here 4892 * since it is possible that a previous endpoint WAS 4893 * listening responded to a INIT-ACK and then 4894 * closed. We opened and bound.. and are now no 4895 * longer listening. 4896 * 4897 * XXXGL: notes on checking listen queue length. 4898 * 1) SCTP_IS_LISTENING() doesn't necessarily mean 4899 * SOLISTENING(), because a listening "UDP type" 4900 * socket isn't listening in terms of the socket 4901 * layer. It is a normal data flow socket, that 4902 * can fork off new connections. Thus, we should 4903 * look into sol_qlen only in case we are !UDP. 4904 * 2) Checking sol_qlen in general requires locking 4905 * the socket, and this code lacks that. 4906 */ 4907 if ((stcb == NULL) && 4908 (!SCTP_IS_LISTENING(inp) || 4909 (!(inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) && 4910 inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) { 4911 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 4912 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 4913 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4914 sctp_abort_association(inp, stcb, m, iphlen, 4915 src, dst, sh, op_err, 4916 mflowtype, mflowid, 4917 vrf_id, port); 4918 } 4919 *offset = length; 4920 return (NULL); 4921 } else { 4922 struct mbuf *ret_buf; 4923 struct sctp_inpcb *linp; 4924 struct sctp_tmit_chunk *chk; 4925 4926 if (stcb) { 4927 linp = NULL; 4928 } else { 4929 linp = inp; 4930 } 4931 4932 if (linp != NULL) { 4933 SCTP_ASOC_CREATE_LOCK(linp); 4934 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 4935 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 4936 SCTP_ASOC_CREATE_UNLOCK(linp); 4937 goto abend; 4938 } 4939 } 4940 4941 if (netp != NULL) { 4942 struct sctp_tcb *locked_stcb; 4943 4944 locked_stcb = stcb; 4945 ret_buf = 4946 sctp_handle_cookie_echo(m, iphlen, 4947 *offset, 4948 src, dst, 4949 sh, 4950 (struct sctp_cookie_echo_chunk *)ch, 4951 &inp, &stcb, netp, 4952 auth_skipped, 4953 auth_offset, 4954 auth_len, 4955 &locked_stcb, 4956 mflowtype, 4957 mflowid, 4958 vrf_id, 4959 port); 4960 if ((locked_stcb != NULL) && (locked_stcb != stcb)) { 4961 SCTP_TCB_UNLOCK(locked_stcb); 4962 } 4963 if (stcb != NULL) { 4964 SCTP_TCB_LOCK_ASSERT(stcb); 4965 } 4966 } else { 4967 ret_buf = NULL; 4968 } 4969 if (linp != NULL) { 4970 SCTP_ASOC_CREATE_UNLOCK(linp); 4971 } 4972 if (ret_buf == NULL) { 4973 if (stcb != NULL) { 4974 SCTP_TCB_UNLOCK(stcb); 4975 } 4976 SCTPDBG(SCTP_DEBUG_INPUT3, 4977 "GAK, null buffer\n"); 4978 *offset = length; 4979 return (NULL); 4980 } 4981 /* if AUTH skipped, see if it verified... */ 4982 if (auth_skipped) { 4983 got_auth = 1; 4984 auth_skipped = 0; 4985 } 4986 /* Restart the timer if we have pending data */ 4987 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 4988 if (chk->whoTo != NULL) { 4989 break; 4990 } 4991 } 4992 if (chk != NULL) { 4993 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 4994 } 4995 } 4996 break; 4997 case SCTP_COOKIE_ACK: 4998 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb); 4999 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 5000 break; 5001 } 5002 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5003 /* We are not interested anymore */ 5004 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5005 ; 5006 } else if (stcb) { 5007 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5008 SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 5009 *offset = length; 5010 return (NULL); 5011 } 5012 } 5013 if ((netp != NULL) && (*netp != NULL)) { 5014 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5015 } 5016 break; 5017 case SCTP_ECN_ECHO: 5018 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n"); 5019 if (stcb == NULL) { 5020 break; 5021 } 5022 if (stcb->asoc.ecn_supported == 0) { 5023 goto unknown_chunk; 5024 } 5025 if (chk_length != sizeof(struct sctp_ecne_chunk)) { 5026 break; 5027 } 5028 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb); 5029 ecne_seen = 1; 5030 break; 5031 case SCTP_ECN_CWR: 5032 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n"); 5033 if (stcb == NULL) { 5034 break; 5035 } 5036 if (stcb->asoc.ecn_supported == 0) { 5037 goto unknown_chunk; 5038 } 5039 if (chk_length != sizeof(struct sctp_cwr_chunk)) { 5040 break; 5041 } 5042 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5043 break; 5044 case SCTP_SHUTDOWN_COMPLETE: 5045 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb); 5046 /* must be first and only chunk */ 5047 if ((num_chunks > 1) || 5048 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5049 *offset = length; 5050 return (stcb); 5051 } 5052 if ((chk_length == sizeof(struct sctp_shutdown_complete_chunk)) && 5053 (stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5054 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5055 stcb, *netp); 5056 *offset = length; 5057 return (NULL); 5058 } 5059 break; 5060 case SCTP_ASCONF: 5061 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5062 if (stcb != NULL) { 5063 if (stcb->asoc.asconf_supported == 0) { 5064 goto unknown_chunk; 5065 } 5066 sctp_handle_asconf(m, *offset, src, 5067 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5068 asconf_cnt++; 5069 } 5070 break; 5071 case SCTP_ASCONF_ACK: 5072 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n"); 5073 if (stcb == NULL) { 5074 break; 5075 } 5076 if (stcb->asoc.asconf_supported == 0) { 5077 goto unknown_chunk; 5078 } 5079 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5080 break; 5081 } 5082 if ((netp != NULL) && (*netp != NULL)) { 5083 /* He's alive so give him credit */ 5084 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5085 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5086 stcb->asoc.overall_error_count, 5087 0, 5088 SCTP_FROM_SCTP_INPUT, 5089 __LINE__); 5090 } 5091 stcb->asoc.overall_error_count = 0; 5092 sctp_handle_asconf_ack(m, *offset, 5093 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5094 if (abort_no_unlock) 5095 return (NULL); 5096 } 5097 break; 5098 case SCTP_FORWARD_CUM_TSN: 5099 case SCTP_IFORWARD_CUM_TSN: 5100 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n", 5101 ch->chunk_type == SCTP_FORWARD_CUM_TSN ? "FORWARD_TSN" : "I_FORWARD_TSN"); 5102 if (stcb == NULL) { 5103 break; 5104 } 5105 if (stcb->asoc.prsctp_supported == 0) { 5106 goto unknown_chunk; 5107 } 5108 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5109 break; 5110 } 5111 if (((stcb->asoc.idata_supported == 1) && (ch->chunk_type == SCTP_FORWARD_CUM_TSN)) || 5112 ((stcb->asoc.idata_supported == 0) && (ch->chunk_type == SCTP_IFORWARD_CUM_TSN))) { 5113 if (ch->chunk_type == SCTP_FORWARD_CUM_TSN) { 5114 SCTP_SNPRINTF(msg, sizeof(msg), "%s", "FORWARD-TSN chunk received when I-FORWARD-TSN was negotiated"); 5115 } else { 5116 SCTP_SNPRINTF(msg, sizeof(msg), "%s", "I-FORWARD-TSN chunk received when FORWARD-TSN was negotiated"); 5117 } 5118 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 5119 sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED); 5120 *offset = length; 5121 return (NULL); 5122 } 5123 *fwd_tsn_seen = 1; 5124 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5125 /* We are not interested anymore */ 5126 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5127 SCTP_FROM_SCTP_INPUT + SCTP_LOC_31); 5128 *offset = length; 5129 return (NULL); 5130 } 5131 /* 5132 * For sending a SACK this looks like DATA chunks. 5133 */ 5134 stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from; 5135 abort_flag = 0; 5136 sctp_handle_forward_tsn(stcb, 5137 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5138 if (abort_flag) { 5139 *offset = length; 5140 return (NULL); 5141 } 5142 break; 5143 case SCTP_STREAM_RESET: 5144 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5145 if (stcb == NULL) { 5146 break; 5147 } 5148 if (stcb->asoc.reconfig_supported == 0) { 5149 goto unknown_chunk; 5150 } 5151 if (chk_length < sizeof(struct sctp_stream_reset_tsn_req)) { 5152 break; 5153 } 5154 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5155 /* stop processing */ 5156 *offset = length; 5157 return (NULL); 5158 } 5159 break; 5160 case SCTP_PACKET_DROPPED: 5161 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5162 if (stcb == NULL) { 5163 break; 5164 } 5165 if (stcb->asoc.pktdrop_supported == 0) { 5166 goto unknown_chunk; 5167 } 5168 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5169 break; 5170 } 5171 if ((netp != NULL) && (*netp != NULL)) { 5172 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5173 stcb, *netp, 5174 min(chk_length, contiguous)); 5175 } 5176 break; 5177 case SCTP_AUTHENTICATION: 5178 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5179 if (stcb == NULL) { 5180 /* save the first AUTH for later processing */ 5181 if (auth_skipped == 0) { 5182 auth_offset = *offset; 5183 auth_len = chk_length; 5184 auth_skipped = 1; 5185 } 5186 /* skip this chunk (temporarily) */ 5187 break; 5188 } 5189 if (stcb->asoc.auth_supported == 0) { 5190 goto unknown_chunk; 5191 } 5192 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5193 (chk_length > (sizeof(struct sctp_auth_chunk) + 5194 SCTP_AUTH_DIGEST_LEN_MAX))) { 5195 /* Its not ours */ 5196 *offset = length; 5197 return (stcb); 5198 } 5199 if (got_auth == 1) { 5200 /* skip this chunk... it's already auth'd */ 5201 break; 5202 } 5203 got_auth = 1; 5204 if (sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, m, *offset)) { 5205 /* auth HMAC failed so dump the packet */ 5206 *offset = length; 5207 return (stcb); 5208 } else { 5209 /* remaining chunks are HMAC checked */ 5210 stcb->asoc.authenticated = 1; 5211 } 5212 break; 5213 5214 default: 5215 unknown_chunk: 5216 /* it's an unknown chunk! */ 5217 if ((ch->chunk_type & 0x40) && 5218 (stcb != NULL) && 5219 (SCTP_GET_STATE(stcb) != SCTP_STATE_EMPTY) && 5220 (SCTP_GET_STATE(stcb) != SCTP_STATE_INUSE) && 5221 (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) { 5222 struct sctp_gen_error_cause *cause; 5223 int len; 5224 5225 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause), 5226 0, M_NOWAIT, 1, MT_DATA); 5227 if (op_err != NULL) { 5228 len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset)); 5229 cause = mtod(op_err, struct sctp_gen_error_cause *); 5230 cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5231 cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause))); 5232 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause); 5233 SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT); 5234 if (SCTP_BUF_NEXT(op_err) != NULL) { 5235#ifdef SCTP_MBUF_LOGGING 5236 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5237 sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY); 5238 } 5239#endif 5240 sctp_queue_op_err(stcb, op_err); 5241 } else { 5242 sctp_m_freem(op_err); 5243 } 5244 } 5245 } 5246 if ((ch->chunk_type & 0x80) == 0) { 5247 /* discard this packet */ 5248 *offset = length; 5249 return (stcb); 5250 } /* else skip this bad chunk and continue... */ 5251 break; 5252 } /* switch (ch->chunk_type) */ 5253 5254next_chunk: 5255 /* get the next chunk */ 5256 *offset += SCTP_SIZE32(chk_length); 5257 if (*offset >= length) { 5258 /* no more data left in the mbuf chain */ 5259 break; 5260 } 5261 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5262 sizeof(struct sctp_chunkhdr), chunk_buf); 5263 if (ch == NULL) { 5264 *offset = length; 5265 return (stcb); 5266 } 5267 } /* while */ 5268 5269 if ((asconf_cnt > 0) && (stcb != NULL)) { 5270 sctp_send_asconf_ack(stcb); 5271 } 5272 return (stcb); 5273} 5274 5275/* 5276 * common input chunk processing (v4 and v6) 5277 */ 5278void 5279sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5280 struct sockaddr *src, struct sockaddr *dst, 5281 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5282 uint8_t compute_crc, 5283 uint8_t ecn_bits, 5284 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 5285 uint32_t vrf_id, uint16_t port) 5286{ 5287 uint32_t high_tsn; 5288 int fwd_tsn_seen = 0, data_processed = 0; 5289 struct mbuf *m = *mm, *op_err; 5290 char msg[SCTP_DIAG_INFO_LEN]; 5291 int un_sent; 5292 int cnt_ctrl_ready = 0; 5293 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5294 struct sctp_tcb *stcb = NULL; 5295 struct sctp_nets *net = NULL; 5296 5297 SCTP_STAT_INCR(sctps_recvdatagrams); 5298#ifdef SCTP_AUDITING_ENABLED 5299 sctp_audit_log(0xE0, 1); 5300 sctp_auditing(0, inp, stcb, net); 5301#endif 5302 if (compute_crc != 0) { 5303 uint32_t check, calc_check; 5304 5305 check = sh->checksum; 5306 sh->checksum = 0; 5307 calc_check = sctp_calculate_cksum(m, iphlen); 5308 sh->checksum = check; 5309 if (calc_check != check) { 5310 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5311 calc_check, check, (void *)m, length, iphlen); 5312 stcb = sctp_findassociation_addr(m, offset, src, dst, 5313 sh, ch, &inp, &net, vrf_id); 5314#if defined(INET) || defined(INET6) 5315 if ((ch->chunk_type != SCTP_INITIATION) && 5316 (net != NULL) && (net->port != port)) { 5317 if (net->port == 0) { 5318 /* UDP encapsulation turned on. */ 5319 net->mtu -= sizeof(struct udphdr); 5320 if (stcb->asoc.smallest_mtu > net->mtu) { 5321 sctp_pathmtu_adjustment(stcb, net->mtu); 5322 } 5323 } else if (port == 0) { 5324 /* UDP encapsulation turned off. */ 5325 net->mtu += sizeof(struct udphdr); 5326 /* XXX Update smallest_mtu */ 5327 } 5328 net->port = port; 5329 } 5330#endif 5331 if (net != NULL) { 5332 net->flowtype = mflowtype; 5333 net->flowid = mflowid; 5334 } 5335 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5336 if ((inp != NULL) && (stcb != NULL)) { 5337 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5338 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5339 } else if ((inp != NULL) && (stcb == NULL)) { 5340 inp_decr = inp; 5341 } 5342 SCTP_STAT_INCR(sctps_badsum); 5343 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5344 goto out; 5345 } 5346 } 5347 /* Destination port of 0 is illegal, based on RFC4960. */ 5348 if (sh->dest_port == 0) { 5349 SCTP_STAT_INCR(sctps_hdrops); 5350 goto out; 5351 } 5352 stcb = sctp_findassociation_addr(m, offset, src, dst, 5353 sh, ch, &inp, &net, vrf_id); 5354#if defined(INET) || defined(INET6) 5355 if ((ch->chunk_type != SCTP_INITIATION) && 5356 (net != NULL) && (net->port != port)) { 5357 if (net->port == 0) { 5358 /* UDP encapsulation turned on. */ 5359 net->mtu -= sizeof(struct udphdr); 5360 if (stcb->asoc.smallest_mtu > net->mtu) { 5361 sctp_pathmtu_adjustment(stcb, net->mtu); 5362 } 5363 } else if (port == 0) { 5364 /* UDP encapsulation turned off. */ 5365 net->mtu += sizeof(struct udphdr); 5366 /* XXX Update smallest_mtu */ 5367 } 5368 net->port = port; 5369 } 5370#endif 5371 if (net != NULL) { 5372 net->flowtype = mflowtype; 5373 net->flowid = mflowid; 5374 } 5375 if (inp == NULL) { 5376 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5377 SCTP_STAT_INCR(sctps_noport); 5378 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5379 goto out; 5380 } 5381 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5382 sctp_send_shutdown_complete2(src, dst, sh, 5383 mflowtype, mflowid, fibnum, 5384 vrf_id, port); 5385 goto out; 5386 } 5387 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5388 goto out; 5389 } 5390 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5391 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5392 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5393 (ch->chunk_type != SCTP_INIT))) { 5394 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5395 "Out of the blue"); 5396 sctp_send_abort(m, iphlen, src, dst, 5397 sh, 0, op_err, 5398 mflowtype, mflowid, fibnum, 5399 vrf_id, port); 5400 } 5401 } 5402 goto out; 5403 } else if (stcb == NULL) { 5404 inp_decr = inp; 5405 } 5406 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5407 (void *)m, iphlen, offset, length, (void *)stcb); 5408 if (stcb) { 5409 /* always clear this before beginning a packet */ 5410 stcb->asoc.authenticated = 0; 5411 stcb->asoc.seen_a_sack_this_pkt = 0; 5412 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5413 (void *)stcb, stcb->asoc.state); 5414 5415 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5416 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5417 /*- 5418 * If we hit here, we had a ref count 5419 * up when the assoc was aborted and the 5420 * timer is clearing out the assoc, we should 5421 * NOT respond to any packet.. its OOTB. 5422 */ 5423 SCTP_TCB_UNLOCK(stcb); 5424 stcb = NULL; 5425 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5426 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5427 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5428 msg); 5429 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5430 mflowtype, mflowid, inp->fibnum, 5431 vrf_id, port); 5432 goto out; 5433 } 5434 } 5435 if (IS_SCTP_CONTROL(ch)) { 5436 /* process the control portion of the SCTP packet */ 5437 /* sa_ignore NO_NULL_CHK */ 5438 stcb = sctp_process_control(m, iphlen, &offset, length, 5439 src, dst, sh, ch, 5440 inp, stcb, &net, &fwd_tsn_seen, 5441 mflowtype, mflowid, fibnum, 5442 vrf_id, port); 5443 if (stcb) { 5444 /* 5445 * This covers us if the cookie-echo was there and 5446 * it changes our INP. 5447 */ 5448 inp = stcb->sctp_ep; 5449#if defined(INET) || defined(INET6) 5450 if ((ch->chunk_type != SCTP_INITIATION) && 5451 (net != NULL) && (net->port != port)) { 5452 if (net->port == 0) { 5453 /* UDP encapsulation turned on. */ 5454 net->mtu -= sizeof(struct udphdr); 5455 if (stcb->asoc.smallest_mtu > net->mtu) { 5456 sctp_pathmtu_adjustment(stcb, net->mtu); 5457 } 5458 } else if (port == 0) { 5459 /* UDP encapsulation turned off. */ 5460 net->mtu += sizeof(struct udphdr); 5461 /* XXX Update smallest_mtu */ 5462 } 5463 net->port = port; 5464 } 5465#endif 5466 } 5467 } else { 5468 /* 5469 * no control chunks, so pre-process DATA chunks (these 5470 * checks are taken care of by control processing) 5471 */ 5472 5473 /* 5474 * if DATA only packet, and auth is required, then punt... 5475 * can't have authenticated without any AUTH (control) 5476 * chunks 5477 */ 5478 if ((stcb != NULL) && 5479 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5480 /* "silently" ignore */ 5481 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5482 SCTP_STAT_INCR(sctps_recvauthmissing); 5483 goto out; 5484 } 5485 if (stcb == NULL) { 5486 /* out of the blue DATA chunk */ 5487 SCTP_PROBE5(receive, NULL, NULL, m, NULL, sh); 5488 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5489 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5490 msg); 5491 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5492 mflowtype, mflowid, fibnum, 5493 vrf_id, port); 5494 goto out; 5495 } 5496 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5497 /* v_tag mismatch! */ 5498 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5499 SCTP_STAT_INCR(sctps_badvtag); 5500 goto out; 5501 } 5502 } 5503 5504 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5505 if (stcb == NULL) { 5506 /* 5507 * no valid TCB for this packet, or we found it's a bad 5508 * packet while processing control, or we're done with this 5509 * packet (done or skip rest of data), so we drop it... 5510 */ 5511 goto out; 5512 } 5513 5514 /* 5515 * DATA chunk processing 5516 */ 5517 /* plow through the data chunks while length > offset */ 5518 5519 /* 5520 * Rest should be DATA only. Check authentication state if AUTH for 5521 * DATA is required. 5522 */ 5523 if ((length > offset) && 5524 (stcb != NULL) && 5525 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5526 !stcb->asoc.authenticated) { 5527 /* "silently" ignore */ 5528 SCTP_STAT_INCR(sctps_recvauthmissing); 5529 SCTPDBG(SCTP_DEBUG_AUTH1, 5530 "Data chunk requires AUTH, skipped\n"); 5531 goto trigger_send; 5532 } 5533 if (length > offset) { 5534 int retval; 5535 5536 /* 5537 * First check to make sure our state is correct. We would 5538 * not get here unless we really did have a tag, so we don't 5539 * abort if this happens, just dump the chunk silently. 5540 */ 5541 switch (SCTP_GET_STATE(stcb)) { 5542 case SCTP_STATE_COOKIE_ECHOED: 5543 /* 5544 * we consider data with valid tags in this state 5545 * shows us the cookie-ack was lost. Imply it was 5546 * there. 5547 */ 5548 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5549 break; 5550 case SCTP_STATE_COOKIE_WAIT: 5551 /* 5552 * We consider OOTB any data sent during asoc setup. 5553 */ 5554 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5555 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5556 msg); 5557 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5558 mflowtype, mflowid, inp->fibnum, 5559 vrf_id, port); 5560 goto out; 5561 /* sa_ignore NOTREACHED */ 5562 break; 5563 case SCTP_STATE_EMPTY: /* should not happen */ 5564 case SCTP_STATE_INUSE: /* should not happen */ 5565 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5566 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5567 default: 5568 goto out; 5569 /* sa_ignore NOTREACHED */ 5570 break; 5571 case SCTP_STATE_OPEN: 5572 case SCTP_STATE_SHUTDOWN_SENT: 5573 break; 5574 } 5575 /* plow through the data chunks while length > offset */ 5576 retval = sctp_process_data(mm, iphlen, &offset, length, 5577 inp, stcb, net, &high_tsn); 5578 if (retval == 2) { 5579 /* 5580 * The association aborted, NO UNLOCK needed since 5581 * the association is destroyed. 5582 */ 5583 stcb = NULL; 5584 goto out; 5585 } 5586 if (retval == 0) { 5587 data_processed = 1; 5588 } 5589 /* 5590 * Anything important needs to have been m_copy'ed in 5591 * process_data 5592 */ 5593 } 5594 5595 /* take care of ecn */ 5596 if ((data_processed == 1) && 5597 (stcb->asoc.ecn_supported == 1) && 5598 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5599 /* Yep, we need to add a ECNE */ 5600 sctp_send_ecn_echo(stcb, net, high_tsn); 5601 } 5602 5603 if ((data_processed == 0) && (fwd_tsn_seen)) { 5604 int was_a_gap; 5605 uint32_t highest_tsn; 5606 5607 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5608 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5609 } else { 5610 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5611 } 5612 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5613 stcb->asoc.send_sack = 1; 5614 sctp_sack_check(stcb, was_a_gap); 5615 } else if (fwd_tsn_seen) { 5616 stcb->asoc.send_sack = 1; 5617 } 5618 /* trigger send of any chunks in queue... */ 5619trigger_send: 5620#ifdef SCTP_AUDITING_ENABLED 5621 sctp_audit_log(0xE0, 2); 5622 sctp_auditing(1, inp, stcb, net); 5623#endif 5624 SCTPDBG(SCTP_DEBUG_INPUT1, 5625 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5626 stcb->asoc.peers_rwnd, 5627 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5628 stcb->asoc.total_flight); 5629 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5630 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5631 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5632 } 5633 if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) || 5634 cnt_ctrl_ready || 5635 stcb->asoc.trigger_reset || 5636 ((un_sent > 0) && 5637 (stcb->asoc.peers_rwnd > 0 || stcb->asoc.total_flight == 0))) { 5638 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5639 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5640 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5641 } 5642#ifdef SCTP_AUDITING_ENABLED 5643 sctp_audit_log(0xE0, 3); 5644 sctp_auditing(2, inp, stcb, net); 5645#endif 5646out: 5647 if (stcb != NULL) { 5648 SCTP_TCB_UNLOCK(stcb); 5649 } 5650 if (inp_decr != NULL) { 5651 /* reduce ref-count */ 5652 SCTP_INP_WLOCK(inp_decr); 5653 SCTP_INP_DECR_REF(inp_decr); 5654 SCTP_INP_WUNLOCK(inp_decr); 5655 } 5656 return; 5657} 5658 5659#ifdef INET 5660void 5661sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5662{ 5663 struct mbuf *m; 5664 int iphlen; 5665 uint32_t vrf_id = 0; 5666 uint8_t ecn_bits; 5667 struct sockaddr_in src, dst; 5668 struct ip *ip; 5669 struct sctphdr *sh; 5670 struct sctp_chunkhdr *ch; 5671 int length, offset; 5672 uint8_t compute_crc; 5673 uint32_t mflowid; 5674 uint8_t mflowtype; 5675 uint16_t fibnum; 5676 5677 iphlen = off; 5678 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5679 SCTP_RELEASE_PKT(i_pak); 5680 return; 5681 } 5682 m = SCTP_HEADER_TO_CHAIN(i_pak); 5683#ifdef SCTP_MBUF_LOGGING 5684 /* Log in any input mbufs */ 5685 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5686 sctp_log_mbc(m, SCTP_MBUF_INPUT); 5687 } 5688#endif 5689#ifdef SCTP_PACKET_LOGGING 5690 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 5691 sctp_packet_log(m); 5692 } 5693#endif 5694 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5695 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 5696 m->m_pkthdr.len, 5697 if_name(m->m_pkthdr.rcvif), 5698 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 5699 mflowid = m->m_pkthdr.flowid; 5700 mflowtype = M_HASHTYPE_GET(m); 5701 fibnum = M_GETFIB(m); 5702 SCTP_STAT_INCR(sctps_recvpackets); 5703 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5704 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 5705 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 5706 if (SCTP_BUF_LEN(m) < offset) { 5707 if ((m = m_pullup(m, offset)) == NULL) { 5708 SCTP_STAT_INCR(sctps_hdrops); 5709 return; 5710 } 5711 } 5712 ip = mtod(m, struct ip *); 5713 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5714 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 5715 offset -= sizeof(struct sctp_chunkhdr); 5716 memset(&src, 0, sizeof(struct sockaddr_in)); 5717 src.sin_family = AF_INET; 5718 src.sin_len = sizeof(struct sockaddr_in); 5719 src.sin_port = sh->src_port; 5720 src.sin_addr = ip->ip_src; 5721 memset(&dst, 0, sizeof(struct sockaddr_in)); 5722 dst.sin_family = AF_INET; 5723 dst.sin_len = sizeof(struct sockaddr_in); 5724 dst.sin_port = sh->dest_port; 5725 dst.sin_addr = ip->ip_dst; 5726 length = ntohs(ip->ip_len); 5727 /* Validate mbuf chain length with IP payload length. */ 5728 if (SCTP_HEADER_LEN(m) != length) { 5729 SCTPDBG(SCTP_DEBUG_INPUT1, 5730 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 5731 SCTP_STAT_INCR(sctps_hdrops); 5732 goto out; 5733 } 5734 /* SCTP does not allow broadcasts or multicasts */ 5735 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 5736 goto out; 5737 } 5738 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 5739 goto out; 5740 } 5741 ecn_bits = ip->ip_tos; 5742 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5743 SCTP_STAT_INCR(sctps_recvhwcrc); 5744 compute_crc = 0; 5745 } else { 5746 SCTP_STAT_INCR(sctps_recvswcrc); 5747 compute_crc = 1; 5748 } 5749 sctp_common_input_processing(&m, iphlen, offset, length, 5750 (struct sockaddr *)&src, 5751 (struct sockaddr *)&dst, 5752 sh, ch, 5753 compute_crc, 5754 ecn_bits, 5755 mflowtype, mflowid, fibnum, 5756 vrf_id, port); 5757out: 5758 if (m) { 5759 sctp_m_freem(m); 5760 } 5761 return; 5762} 5763 5764#if defined(SCTP_MCORE_INPUT) && defined(SMP) 5765extern int *sctp_cpuarry; 5766#endif 5767 5768int 5769sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED) 5770{ 5771 struct mbuf *m; 5772 int off; 5773 5774 m = *mp; 5775 off = *offp; 5776#if defined(SCTP_MCORE_INPUT) && defined(SMP) 5777 if (mp_ncpus > 1) { 5778 struct ip *ip; 5779 struct sctphdr *sh; 5780 int offset; 5781 int cpu_to_use; 5782 uint32_t flowid, tag; 5783 5784 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 5785 flowid = m->m_pkthdr.flowid; 5786 } else { 5787 /* 5788 * No flow id built by lower layers fix it so we 5789 * create one. 5790 */ 5791 offset = off + sizeof(struct sctphdr); 5792 if (SCTP_BUF_LEN(m) < offset) { 5793 if ((m = m_pullup(m, offset)) == NULL) { 5794 SCTP_STAT_INCR(sctps_hdrops); 5795 return (IPPROTO_DONE); 5796 } 5797 } 5798 ip = mtod(m, struct ip *); 5799 sh = (struct sctphdr *)((caddr_t)ip + off); 5800 tag = htonl(sh->v_tag); 5801 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 5802 m->m_pkthdr.flowid = flowid; 5803 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH); 5804 } 5805 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 5806 sctp_queue_to_mcore(m, off, cpu_to_use); 5807 return (IPPROTO_DONE); 5808 } 5809#endif 5810 sctp_input_with_port(m, off, 0); 5811 return (IPPROTO_DONE); 5812} 5813#endif 5814