sys/netinet/sctp_input.c

   1 /*-
   2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2011, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2011, by Michael Tuexen. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * a) Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  *
  12  * b) Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the distribution.
  15  *
  16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 /* $KAME: sctp_input.c,v 1.27 2005/03/06 16:04:17 itojun Exp $   */
  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/udp.h>
  53 #include <sys/smp.h>
  54
  55
  56
  57 static void
  58 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb)
  59 {
  60         struct sctp_nets *net;
  61
  62         /*
  63          * This now not only stops all cookie timers it also stops any INIT
  64          * timers as well. This will make sure that the timers are stopped
  65          * in all collision cases.
  66          */
  67         SCTP_TCB_LOCK_ASSERT(stcb);
  68         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
  69                 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) {
  70                         sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE,
  71                             stcb->sctp_ep,
  72                             stcb,
  73                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1);
  74                 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) {
  75                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT,
  76                             stcb->sctp_ep,
  77                             stcb,
  78                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2);
  79                 }
  80         }
  81 }
  82
  83 /* INIT handler */
  84 static void
  85 sctp_handle_init(struct mbuf *m, int iphlen, int offset, struct sctphdr *sh,
  86     struct sctp_init_chunk *cp, struct sctp_inpcb *inp, struct sctp_tcb *stcb,
  87     int *abort_no_unlock, uint32_t vrf_id, uint16_t port)
  88 {
  89         struct sctp_init *init;
  90         struct mbuf *op_err;
  91
  92         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
  93             stcb);
  94         if (stcb == NULL) {
  95                 SCTP_INP_RLOCK(inp);
  96         }
  97         /* validate length */
  98         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) {
  99                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 100                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
 101                     vrf_id, port);
 102                 if (stcb)
 103                         *abort_no_unlock = 1;
 104                 goto outnow;
 105         }
 106         /* validate parameters */
 107         init = &cp->init;
 108         if (init->initiate_tag == 0) {
 109                 /* protocol error... send abort */
 110                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 111                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
 112                     vrf_id, port);
 113                 if (stcb)
 114                         *abort_no_unlock = 1;
 115                 goto outnow;
 116         }
 117         if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) {
 118                 /* invalid parameter... send abort */
 119                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 120                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
 121                     vrf_id, port);
 122                 if (stcb)
 123                         *abort_no_unlock = 1;
 124                 goto outnow;
 125         }
 126         if (init->num_inbound_streams == 0) {
 127                 /* protocol error... send abort */
 128                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 129                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
 130                     vrf_id, port);
 131                 if (stcb)
 132                         *abort_no_unlock = 1;
 133                 goto outnow;
 134         }
 135         if (init->num_outbound_streams == 0) {
 136                 /* protocol error... send abort */
 137                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 138                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
 139                     vrf_id, port);
 140                 if (stcb)
 141                         *abort_no_unlock = 1;
 142                 goto outnow;
 143         }
 144         if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
 145             offset + ntohs(cp->ch.chunk_length))) {
 146                 /* auth parameter(s) error... send abort */
 147                 sctp_abort_association(inp, stcb, m, iphlen, sh, NULL, vrf_id, port);
 148                 if (stcb)
 149                         *abort_no_unlock = 1;
 150                 goto outnow;
 151         }
 152         /*
 153          * We are only accepting if we have a socket with positive
 154          * so_qlimit.
 155          */
 156         if ((stcb == NULL) &&
 157             ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
 158             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
 159             (inp->sctp_socket == NULL) ||
 160             (inp->sctp_socket->so_qlimit == 0))) {
 161                 /*
 162                  * FIX ME ?? What about TCP model and we have a
 163                  * match/restart case? Actually no fix is needed. the lookup
 164                  * will always find the existing assoc so stcb would not be
 165                  * NULL. It may be questionable to do this since we COULD
 166                  * just send back the INIT-ACK and hope that the app did
 167                  * accept()'s by the time the COOKIE was sent. But there is
 168                  * a price to pay for COOKIE generation and I don't want to
 169                  * pay it on the chance that the app will actually do some
 170                  * accepts(). The App just looses and should NOT be in this
 171                  * state :-)
 172                  */
 173                 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) {
 174                         sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port);
 175                 }
 176                 goto outnow;
 177         }
 178         if ((stcb != NULL) &&
 179             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 180                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n");
 181                 sctp_send_shutdown_ack(stcb, NULL);
 182                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
 183         } else {
 184                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
 185                 sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, sh, cp, vrf_id, port,
 186                     ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED));
 187         }
 188 outnow:
 189         if (stcb == NULL) {
 190                 SCTP_INP_RUNLOCK(inp);
 191         }
 192 }
 193
 194 /*
 195  * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
 196  */
 197
 198 int
 199 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked
 200 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 201     SCTP_UNUSED
 202 #endif
 203 )
 204 {
 205         int unsent_data = 0;
 206         unsigned int i;
 207         struct sctp_stream_queue_pending *sp;
 208         struct sctp_association *asoc;
 209
 210         /*
 211          * This function returns the number of streams that have true unsent
 212          * data on them. Note that as it looks through it will clean up any
 213          * places that have old data that has been sent but left at top of
 214          * stream queue.
 215          */
 216         asoc = &stcb->asoc;
 217         SCTP_TCB_SEND_LOCK(stcb);
 218         if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
 219                 /* Check to see if some data queued */
 220                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 221                         /* sa_ignore FREED_MEMORY */
 222                         sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
 223                         if (sp == NULL) {
 224                                 continue;
 225                         }
 226                         if ((sp->msg_is_complete) &&
 227                             (sp->length == 0) &&
 228                             (sp->sender_all_done)) {
 229                                 /*
 230                                  * We are doing differed cleanup. Last time
 231                                  * through when we took all the data the
 232                                  * sender_all_done was not set.
 233                                  */
 234                                 if (sp->put_last_out == 0) {
 235                                         SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
 236                                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
 237                                             sp->sender_all_done,
 238                                             sp->length,
 239                                             sp->msg_is_complete,
 240                                             sp->put_last_out);
 241                                 }
 242                                 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 243                                 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
 244                                 if (sp->net) {
 245                                         sctp_free_remote_addr(sp->net);
 246                                         sp->net = NULL;
 247                                 }
 248                                 if (sp->data) {
 249                                         sctp_m_freem(sp->data);
 250                                         sp->data = NULL;
 251                                 }
 252                                 sctp_free_a_strmoq(stcb, sp, so_locked);
 253                         } else {
 254                                 unsent_data++;
 255                                 break;
 256                         }
 257                 }
 258         }
 259         SCTP_TCB_SEND_UNLOCK(stcb);
 260         return (unsent_data);
 261 }
 262
 263 static int
 264 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb)
 265 {
 266         struct sctp_init *init;
 267         struct sctp_association *asoc;
 268         struct sctp_nets *lnet;
 269         unsigned int i;
 270
 271         init = &cp->init;
 272         asoc = &stcb->asoc;
 273         /* save off parameters */
 274         asoc->peer_vtag = ntohl(init->initiate_tag);
 275         asoc->peers_rwnd = ntohl(init->a_rwnd);
 276         /* init tsn's */
 277         asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
 278
 279         if (!TAILQ_EMPTY(&asoc->nets)) {
 280                 /* update any ssthresh's that may have a default */
 281                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
 282                         lnet->ssthresh = asoc->peers_rwnd;
 283                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
 284                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
 285                         }
 286                 }
 287         }
 288         SCTP_TCB_SEND_LOCK(stcb);
 289         if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
 290                 unsigned int newcnt;
 291                 struct sctp_stream_out *outs;
 292                 struct sctp_stream_queue_pending *sp, *nsp;
 293                 struct sctp_tmit_chunk *chk, *nchk;
 294
 295                 /* abandon the upper streams */
 296                 newcnt = ntohs(init->num_inbound_streams);
 297                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
 298                         if (chk->rec.data.stream_number >= newcnt) {
 299                                 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
 300                                 asoc->send_queue_cnt--;
 301                                 if (chk->data != NULL) {
 302                                         sctp_free_bufspace(stcb, asoc, chk, 1);
 303                                         sctp_ulp_notify(SCTP_NOTIFY_DG_FAIL, stcb,
 304                                             SCTP_NOTIFY_DATAGRAM_UNSENT, chk, SCTP_SO_NOT_LOCKED);
 305                                         if (chk->data) {
 306                                                 sctp_m_freem(chk->data);
 307                                                 chk->data = NULL;
 308                                         }
 309                                 }
 310                                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 311                                 /* sa_ignore FREED_MEMORY */
 312                         }
 313                 }
 314                 if (asoc->strmout) {
 315                         for (i = newcnt; i < asoc->pre_open_streams; i++) {
 316                                 outs = &asoc->strmout[i];
 317                                 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
 318                                         TAILQ_REMOVE(&outs->outqueue, sp, next);
 319                                         asoc->stream_queue_cnt--;
 320                                         sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
 321                                             stcb, SCTP_NOTIFY_DATAGRAM_UNSENT,
 322                                             sp, SCTP_SO_NOT_LOCKED);
 323                                         if (sp->data) {
 324                                                 sctp_m_freem(sp->data);
 325                                                 sp->data = NULL;
 326                                         }
 327                                         if (sp->net) {
 328                                                 sctp_free_remote_addr(sp->net);
 329                                                 sp->net = NULL;
 330                                         }
 331                                         /* Free the chunk */
 332                                         sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
 333                                         /* sa_ignore FREED_MEMORY */
 334                                 }
 335                         }
 336                 }
 337                 /* cut back the count */
 338                 asoc->pre_open_streams = newcnt;
 339         }
 340         SCTP_TCB_SEND_UNLOCK(stcb);
 341         asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams;
 342
 343         /* EY - nr_sack: initialize highest tsn in nr_mapping_array */
 344         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
 345         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
 346                 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 347         }
 348         /* This is the next one we expect */
 349         asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
 350
 351         asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
 352         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
 353
 354         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
 355         /* open the requested streams */
 356
 357         if (asoc->strmin != NULL) {
 358                 /* Free the old ones */
 359                 struct sctp_queued_to_read *ctl, *nctl;
 360
 361                 for (i = 0; i < asoc->streamincnt; i++) {
 362                         TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) {
 363                                 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next);
 364                                 sctp_free_remote_addr(ctl->whoFrom);
 365                                 ctl->whoFrom = NULL;
 366                                 sctp_m_freem(ctl->data);
 367                                 ctl->data = NULL;
 368                                 sctp_free_a_readq(stcb, ctl);
 369                         }
 370                 }
 371                 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
 372         }
 373         asoc->streamincnt = ntohs(init->num_outbound_streams);
 374         if (asoc->streamincnt > MAX_SCTP_STREAMS) {
 375                 asoc->streamincnt = MAX_SCTP_STREAMS;
 376         }
 377         SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
 378             sizeof(struct sctp_stream_in), SCTP_M_STRMI);
 379         if (asoc->strmin == NULL) {
 380                 /* we didn't get memory for the streams! */
 381                 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
 382                 return (-1);
 383         }
 384         for (i = 0; i < asoc->streamincnt; i++) {
 385                 asoc->strmin[i].stream_no = i;
 386                 asoc->strmin[i].last_sequence_delivered = 0xffff;
 387                 /*
 388                  * U-stream ranges will be set when the cookie is unpacked.
 389                  * Or for the INIT sender they are un set (if pr-sctp not
 390                  * supported) when the INIT-ACK arrives.
 391                  */
 392                 TAILQ_INIT(&asoc->strmin[i].inqueue);
 393                 asoc->strmin[i].delivery_started = 0;
 394         }
 395         /*
 396          * load_address_from_init will put the addresses into the
 397          * association when the COOKIE is processed or the INIT-ACK is
 398          * processed. Both types of COOKIE's existing and new call this
 399          * routine. It will remove addresses that are no longer in the
 400          * association (for the restarting case where addresses are
 401          * removed). Up front when the INIT arrives we will discard it if it
 402          * is a restart and new addresses have been added.
 403          */
 404         /* sa_ignore MEMLEAK */
 405         return (0);
 406 }
 407
 408 /*
 409  * INIT-ACK message processing/consumption returns value < 0 on error
 410  */
 411 static int
 412 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
 413     struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
 414     struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id)
 415 {
 416         struct sctp_association *asoc;
 417         struct mbuf *op_err;
 418         int retval, abort_flag;
 419         uint32_t initack_limit;
 420         int nat_friendly = 0;
 421
 422         /* First verify that we have no illegal param's */
 423         abort_flag = 0;
 424         op_err = NULL;
 425
 426         op_err = sctp_arethere_unrecognized_parameters(m,
 427             (offset + sizeof(struct sctp_init_chunk)),
 428             &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly);
 429         if (abort_flag) {
 430                 /* Send an abort and notify peer */
 431                 sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_CAUSE_PROTOCOL_VIOLATION, op_err, SCTP_SO_NOT_LOCKED);
 432                 *abort_no_unlock = 1;
 433                 return (-1);
 434         }
 435         asoc = &stcb->asoc;
 436         asoc->peer_supports_nat = (uint8_t) nat_friendly;
 437         /* process the peer's parameters in the INIT-ACK */
 438         retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb);
 439         if (retval < 0) {
 440                 return (retval);
 441         }
 442         initack_limit = offset + ntohs(cp->ch.chunk_length);
 443         /* load all addresses */
 444         if ((retval = sctp_load_addresses_from_init(stcb, m,
 445             (offset + sizeof(struct sctp_init_chunk)), initack_limit, sh,
 446             NULL))) {
 447                 /* Huh, we should abort */
 448                 SCTPDBG(SCTP_DEBUG_INPUT1,
 449                     "Load addresses from INIT causes an abort %d\n",
 450                     retval);
 451                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
 452                     NULL, 0, net->port);
 453                 *abort_no_unlock = 1;
 454                 return (-1);
 455         }
 456         /* if the peer doesn't support asconf, flush the asconf queue */
 457         if (asoc->peer_supports_asconf == 0) {
 458                 struct sctp_asconf_addr *param, *nparam;
 459
 460                 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
 461                         TAILQ_REMOVE(&asoc->asconf_queue, param, next);
 462                         SCTP_FREE(param, SCTP_M_ASC_ADDR);
 463                 }
 464         }
 465         stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
 466             stcb->asoc.local_hmacs);
 467         if (op_err) {
 468                 sctp_queue_op_err(stcb, op_err);
 469                 /* queuing will steal away the mbuf chain to the out queue */
 470                 op_err = NULL;
 471         }
 472         /* extract the cookie and queue it to "echo" it back... */
 473         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 474                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 475                     stcb->asoc.overall_error_count,
 476                     0,
 477                     SCTP_FROM_SCTP_INPUT,
 478                     __LINE__);
 479         }
 480         stcb->asoc.overall_error_count = 0;
 481         net->error_count = 0;
 482
 483         /*
 484          * Cancel the INIT timer, We do this first before queueing the
 485          * cookie. We always cancel at the primary to assue that we are
 486          * canceling the timer started by the INIT which always goes to the
 487          * primary.
 488          */
 489         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
 490             asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
 491
 492         /* calculate the RTO */
 493         net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy,
 494             SCTP_RTT_FROM_NON_DATA);
 495
 496         retval = sctp_send_cookie_echo(m, offset, stcb, net);
 497         if (retval < 0) {
 498                 /*
 499                  * No cookie, we probably should send a op error. But in any
 500                  * case if there is no cookie in the INIT-ACK, we can
 501                  * abandon the peer, its broke.
 502                  */
 503                 if (retval == -3) {
 504                         /* We abort with an error of missing mandatory param */
 505                         op_err =
 506                             sctp_generate_invmanparam(SCTP_CAUSE_MISSING_PARAM);
 507                         if (op_err) {
 508                                 /*
 509                                  * Expand beyond to include the mandatory
 510                                  * param cookie
 511                                  */
 512                                 struct sctp_inv_mandatory_param *mp;
 513
 514                                 SCTP_BUF_LEN(op_err) =
 515                                     sizeof(struct sctp_inv_mandatory_param);
 516                                 mp = mtod(op_err,
 517                                     struct sctp_inv_mandatory_param *);
 518                                 /* Subtract the reserved param */
 519                                 mp->length =
 520                                     htons(sizeof(struct sctp_inv_mandatory_param) - 2);
 521                                 mp->num_param = htonl(1);
 522                                 mp->param = htons(SCTP_STATE_COOKIE);
 523                                 mp->resv = 0;
 524                         }
 525                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 526                             sh, op_err, vrf_id, net->port);
 527                         *abort_no_unlock = 1;
 528                 }
 529                 return (retval);
 530         }
 531         return (0);
 532 }
 533
 534 static void
 535 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
 536     struct sctp_tcb *stcb, struct sctp_nets *net)
 537 {
 538         struct sockaddr_storage store;
 539         struct sctp_nets *r_net, *f_net;
 540         struct timeval tv;
 541         int req_prim = 0;
 542         uint16_t old_error_counter;
 543
 544 #ifdef INET
 545         struct sockaddr_in *sin;
 546
 547 #endif
 548 #ifdef INET6
 549         struct sockaddr_in6 *sin6;
 550
 551 #endif
 552
 553         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
 554                 /* Invalid length */
 555                 return;
 556         }
 557         memset(&store, 0, sizeof(store));
 558         switch (cp->heartbeat.hb_info.addr_family) {
 559 #ifdef INET
 560         case AF_INET:
 561                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
 562                         sin = (struct sockaddr_in *)&store;
 563                         sin->sin_family = cp->heartbeat.hb_info.addr_family;
 564                         sin->sin_len = cp->heartbeat.hb_info.addr_len;
 565                         sin->sin_port = stcb->rport;
 566                         memcpy(&sin->sin_addr, cp->heartbeat.hb_info.address,
 567                             sizeof(sin->sin_addr));
 568                 } else {
 569                         return;
 570                 }
 571                 break;
 572 #endif
 573 #ifdef INET6
 574         case AF_INET6:
 575                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
 576                         sin6 = (struct sockaddr_in6 *)&store;
 577                         sin6->sin6_family = cp->heartbeat.hb_info.addr_family;
 578                         sin6->sin6_len = cp->heartbeat.hb_info.addr_len;
 579                         sin6->sin6_port = stcb->rport;
 580                         memcpy(&sin6->sin6_addr, cp->heartbeat.hb_info.address,
 581                             sizeof(sin6->sin6_addr));
 582                 } else {
 583                         return;
 584                 }
 585                 break;
 586 #endif
 587         default:
 588                 return;
 589         }
 590         r_net = sctp_findnet(stcb, (struct sockaddr *)&store);
 591         if (r_net == NULL) {
 592                 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
 593                 return;
 594         }
 595         if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 596             (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
 597             (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
 598                 /*
 599                  * If the its a HB and it's random value is correct when can
 600                  * confirm the destination.
 601                  */
 602                 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 603                 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
 604                         stcb->asoc.primary_destination = r_net;
 605                         r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
 606                         f_net = TAILQ_FIRST(&stcb->asoc.nets);
 607                         if (f_net != r_net) {
 608                                 /*
 609                                  * first one on the list is NOT the primary
 610                                  * sctp_cmpaddr() is much more efficent if
 611                                  * the primary is the first on the list,
 612                                  * make it so.
 613                                  */
 614                                 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
 615                                 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
 616                         }
 617                         req_prim = 1;
 618                 }
 619                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 620                     stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 621                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 622                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 623         }
 624         old_error_counter = r_net->error_count;
 625         r_net->error_count = 0;
 626         r_net->hb_responded = 1;
 627         tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
 628         tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
 629         /* Now lets do a RTO with this */
 630         r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy,
 631             SCTP_RTT_FROM_NON_DATA);
 632         if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
 633                 r_net->dest_state |= SCTP_ADDR_REACHABLE;
 634                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
 635                     SCTP_HEARTBEAT_SUCCESS, (void *)r_net, SCTP_SO_NOT_LOCKED);
 636         }
 637         if (r_net->dest_state & SCTP_ADDR_PF) {
 638                 r_net->dest_state &= ~SCTP_ADDR_PF;
 639                 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
 640         }
 641         if (old_error_counter > 0) {
 642                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 643                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 644         }
 645         if (r_net == stcb->asoc.primary_destination) {
 646                 if (stcb->asoc.alternate) {
 647                         /* release the alternate, primary is good */
 648                         sctp_free_remote_addr(stcb->asoc.alternate);
 649                         stcb->asoc.alternate = NULL;
 650                 }
 651         }
 652         /* Mobility adaptation */
 653         if (req_prim) {
 654                 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
 655                     SCTP_MOBILITY_BASE) ||
 656                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 657                     SCTP_MOBILITY_FASTHANDOFF)) &&
 658                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 659                     SCTP_MOBILITY_PRIM_DELETED)) {
 660
 661                         sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7);
 662                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 663                             SCTP_MOBILITY_FASTHANDOFF)) {
 664                                 sctp_assoc_immediate_retrans(stcb,
 665                                     stcb->asoc.primary_destination);
 666                         }
 667                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 668                             SCTP_MOBILITY_BASE)) {
 669                                 sctp_move_chunks_from_net(stcb,
 670                                     stcb->asoc.deleted_primary);
 671                         }
 672                         sctp_delete_prim_timer(stcb->sctp_ep, stcb,
 673                             stcb->asoc.deleted_primary);
 674                 }
 675         }
 676 }
 677
 678 static int
 679 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
 680 {
 681         /*
 682          * return 0 means we want you to proceed with the abort non-zero
 683          * means no abort processing
 684          */
 685         struct sctpasochead *head;
 686
 687         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) {
 688                 /* generate a new vtag and send init */
 689                 LIST_REMOVE(stcb, sctp_asocs);
 690                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 691                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 692                 /*
 693                  * put it in the bucket in the vtag hash of assoc's for the
 694                  * system
 695                  */
 696                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 697                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 698                 return (1);
 699         }
 700         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
 701                 /*
 702                  * treat like a case where the cookie expired i.e.: - dump
 703                  * current cookie. - generate a new vtag. - resend init.
 704                  */
 705                 /* generate a new vtag and send init */
 706                 LIST_REMOVE(stcb, sctp_asocs);
 707                 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED;
 708                 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT;
 709                 sctp_stop_all_cookie_timers(stcb);
 710                 sctp_toss_old_cookies(stcb, &stcb->asoc);
 711                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 712                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 713                 /*
 714                  * put it in the bucket in the vtag hash of assoc's for the
 715                  * system
 716                  */
 717                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 718                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 719                 return (1);
 720         }
 721         return (0);
 722 }
 723
 724 static int
 725 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
 726     struct sctp_nets *net)
 727 {
 728         /*
 729          * return 0 means we want you to proceed with the abort non-zero
 730          * means no abort processing
 731          */
 732         if (stcb->asoc.peer_supports_auth == 0) {
 733                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
 734                 return (0);
 735         }
 736         sctp_asconf_send_nat_state_update(stcb, net);
 737         return (1);
 738 }
 739
 740
 741 static void
 742 sctp_handle_abort(struct sctp_abort_chunk *cp,
 743     struct sctp_tcb *stcb, struct sctp_nets *net)
 744 {
 745 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 746         struct socket *so;
 747
 748 #endif
 749         uint16_t len;
 750
 751         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
 752         if (stcb == NULL)
 753                 return;
 754
 755         len = ntohs(cp->ch.chunk_length);
 756         if (len > sizeof(struct sctp_chunkhdr)) {
 757                 /*
 758                  * Need to check the cause codes for our two magic nat
 759                  * aborts which don't kill the assoc necessarily.
 760                  */
 761                 struct sctp_abort_chunk *cpnext;
 762                 struct sctp_missing_nat_state *natc;
 763                 uint16_t cause;
 764
 765                 cpnext = cp;
 766                 cpnext++;
 767                 natc = (struct sctp_missing_nat_state *)cpnext;
 768                 cause = ntohs(natc->cause);
 769                 if (cause == SCTP_CAUSE_NAT_COLLIDING_STATE) {
 770                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
 771                             cp->ch.chunk_flags);
 772                         if (sctp_handle_nat_colliding_state(stcb)) {
 773                                 return;
 774                         }
 775                 } else if (cause == SCTP_CAUSE_NAT_MISSING_STATE) {
 776                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
 777                             cp->ch.chunk_flags);
 778                         if (sctp_handle_nat_missing_state(stcb, net)) {
 779                                 return;
 780                         }
 781                 }
 782         }
 783         /* stop any receive timers */
 784         sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 785         /* notify user of the abort and clean up... */
 786         sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED);
 787         /* free the tcb */
 788         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
 789         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) ||
 790             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 791                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 792         }
 793 #ifdef SCTP_ASOCLOG_OF_TSNS
 794         sctp_print_out_track_log(stcb);
 795 #endif
 796 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 797         so = SCTP_INP_SO(stcb->sctp_ep);
 798         atomic_add_int(&stcb->asoc.refcnt, 1);
 799         SCTP_TCB_UNLOCK(stcb);
 800         SCTP_SOCKET_LOCK(so, 1);
 801         SCTP_TCB_LOCK(stcb);
 802         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 803 #endif
 804         stcb->asoc.state |= SCTP_STATE_WAS_ABORTED;
 805         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 806             SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 807 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 808         SCTP_SOCKET_UNLOCK(so, 1);
 809 #endif
 810         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
 811 }
 812
 813 static void
 814 sctp_start_net_timers(struct sctp_tcb *stcb)
 815 {
 816         uint32_t cnt_hb_sent;
 817         struct sctp_nets *net;
 818
 819         cnt_hb_sent = 0;
 820         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 821                 /*
 822                  * For each network start: 1) A pmtu timer. 2) A HB timer 3)
 823                  * If the dest in unconfirmed send a hb as well if under
 824                  * max_hb_burst have been sent.
 825                  */
 826                 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
 827                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
 828                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
 829                     (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
 830                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 831                         cnt_hb_sent++;
 832                 }
 833         }
 834         if (cnt_hb_sent) {
 835                 sctp_chunk_output(stcb->sctp_ep, stcb,
 836                     SCTP_OUTPUT_FROM_COOKIE_ACK,
 837                     SCTP_SO_NOT_LOCKED);
 838         }
 839 }
 840
 841
 842 static void
 843 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
 844     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
 845 {
 846         struct sctp_association *asoc;
 847         int some_on_streamwheel;
 848
 849 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 850         struct socket *so;
 851
 852 #endif
 853
 854         SCTPDBG(SCTP_DEBUG_INPUT2,
 855             "sctp_handle_shutdown: handling SHUTDOWN\n");
 856         if (stcb == NULL)
 857                 return;
 858         asoc = &stcb->asoc;
 859         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 860             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 861                 return;
 862         }
 863         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
 864                 /* Shutdown NOT the expected size */
 865                 return;
 866         } else {
 867                 sctp_update_acked(stcb, cp, abort_flag);
 868                 if (*abort_flag) {
 869                         return;
 870                 }
 871         }
 872         if (asoc->control_pdapi) {
 873                 /*
 874                  * With a normal shutdown we assume the end of last record.
 875                  */
 876                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 877                 asoc->control_pdapi->end_added = 1;
 878                 asoc->control_pdapi->pdapi_aborted = 1;
 879                 asoc->control_pdapi = NULL;
 880                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 881 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 882                 so = SCTP_INP_SO(stcb->sctp_ep);
 883                 atomic_add_int(&stcb->asoc.refcnt, 1);
 884                 SCTP_TCB_UNLOCK(stcb);
 885                 SCTP_SOCKET_LOCK(so, 1);
 886                 SCTP_TCB_LOCK(stcb);
 887                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 888                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 889                         /* assoc was freed while we were unlocked */
 890                         SCTP_SOCKET_UNLOCK(so, 1);
 891                         return;
 892                 }
 893 #endif
 894                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 895 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 896                 SCTP_SOCKET_UNLOCK(so, 1);
 897 #endif
 898         }
 899         /* goto SHUTDOWN_RECEIVED state to block new requests */
 900         if (stcb->sctp_socket) {
 901                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 902                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
 903                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
 904                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED);
 905                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 906                         /*
 907                          * notify upper layer that peer has initiated a
 908                          * shutdown
 909                          */
 910                         sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 911
 912                         /* reset time */
 913                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
 914                 }
 915         }
 916         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
 917                 /*
 918                  * stop the shutdown timer, since we WILL move to
 919                  * SHUTDOWN-ACK-SENT.
 920                  */
 921                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
 922         }
 923         /* Now is there unsent data on a stream somewhere? */
 924         some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
 925
 926         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 927             !TAILQ_EMPTY(&asoc->sent_queue) ||
 928             some_on_streamwheel) {
 929                 /* By returning we will push more data out */
 930                 return;
 931         } else {
 932                 /* no outstanding data to send, so move on... */
 933                 /* send SHUTDOWN-ACK */
 934                 sctp_send_shutdown_ack(stcb, net);
 935                 /* move to SHUTDOWN-ACK-SENT state */
 936                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
 937                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 938                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 939                 }
 940                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
 941                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 942                 sctp_stop_timers_for_shutdown(stcb);
 943                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep,
 944                     stcb, net);
 945         }
 946 }
 947
 948 static void
 949 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
 950     struct sctp_tcb *stcb,
 951     struct sctp_nets *net)
 952 {
 953         struct sctp_association *asoc;
 954
 955 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 956         struct socket *so;
 957
 958         so = SCTP_INP_SO(stcb->sctp_ep);
 959 #endif
 960         SCTPDBG(SCTP_DEBUG_INPUT2,
 961             "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
 962         if (stcb == NULL)
 963                 return;
 964
 965         asoc = &stcb->asoc;
 966         /* process according to association state */
 967         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 968             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 969                 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
 970                 sctp_send_shutdown_complete(stcb, net, 1);
 971                 SCTP_TCB_UNLOCK(stcb);
 972                 return;
 973         }
 974         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
 975             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 976                 /* unexpected SHUTDOWN-ACK... so ignore... */
 977                 SCTP_TCB_UNLOCK(stcb);
 978                 return;
 979         }
 980         if (asoc->control_pdapi) {
 981                 /*
 982                  * With a normal shutdown we assume the end of last record.
 983                  */
 984                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 985                 asoc->control_pdapi->end_added = 1;
 986                 asoc->control_pdapi->pdapi_aborted = 1;
 987                 asoc->control_pdapi = NULL;
 988                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 989 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 990                 atomic_add_int(&stcb->asoc.refcnt, 1);
 991                 SCTP_TCB_UNLOCK(stcb);
 992                 SCTP_SOCKET_LOCK(so, 1);
 993                 SCTP_TCB_LOCK(stcb);
 994                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 995                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 996                         /* assoc was freed while we were unlocked */
 997                         SCTP_SOCKET_UNLOCK(so, 1);
 998                         return;
 999                 }
1000 #endif
1001                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
1002 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1003                 SCTP_SOCKET_UNLOCK(so, 1);
1004 #endif
1005         }
1006         /* are the queues empty? */
1007         if (!TAILQ_EMPTY(&asoc->send_queue) ||
1008             !TAILQ_EMPTY(&asoc->sent_queue) ||
1009             !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
1010                 sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED);
1011         }
1012         /* stop the timer */
1013         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
1014         /* send SHUTDOWN-COMPLETE */
1015         sctp_send_shutdown_complete(stcb, net, 0);
1016         /* notify upper layer protocol */
1017         if (stcb->sctp_socket) {
1018                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1019                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
1020                         stcb->sctp_socket->so_snd.sb_cc = 0;
1021                 }
1022                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
1023         }
1024         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1025         /* free the TCB but first save off the ep */
1026 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1027         atomic_add_int(&stcb->asoc.refcnt, 1);
1028         SCTP_TCB_UNLOCK(stcb);
1029         SCTP_SOCKET_LOCK(so, 1);
1030         SCTP_TCB_LOCK(stcb);
1031         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1032 #endif
1033         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1034             SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
1035 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1036         SCTP_SOCKET_UNLOCK(so, 1);
1037 #endif
1038 }
1039
1040 /*
1041  * Skip past the param header and then we will find the chunk that caused the
1042  * problem. There are two possiblities ASCONF or FWD-TSN other than that and
1043  * our peer must be broken.
1044  */
1045 static void
1046 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr,
1047     struct sctp_nets *net)
1048 {
1049         struct sctp_chunkhdr *chk;
1050
1051         chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr));
1052         switch (chk->chunk_type) {
1053         case SCTP_ASCONF_ACK:
1054         case SCTP_ASCONF:
1055                 sctp_asconf_cleanup(stcb, net);
1056                 break;
1057         case SCTP_FORWARD_CUM_TSN:
1058                 stcb->asoc.peer_supports_prsctp = 0;
1059                 break;
1060         default:
1061                 SCTPDBG(SCTP_DEBUG_INPUT2,
1062                     "Peer does not support chunk type %d(%x)??\n",
1063                     chk->chunk_type, (uint32_t) chk->chunk_type);
1064                 break;
1065         }
1066 }
1067
1068 /*
1069  * Skip past the param header and then we will find the param that caused the
1070  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1071  * these will turn of specific features.
1072  */
1073 static void
1074 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr)
1075 {
1076         struct sctp_paramhdr *pbad;
1077
1078         pbad = phdr + 1;
1079         switch (ntohs(pbad->param_type)) {
1080                 /* pr-sctp draft */
1081         case SCTP_PRSCTP_SUPPORTED:
1082                 stcb->asoc.peer_supports_prsctp = 0;
1083                 break;
1084         case SCTP_SUPPORTED_CHUNK_EXT:
1085                 break;
1086                 /* draft-ietf-tsvwg-addip-sctp */
1087         case SCTP_HAS_NAT_SUPPORT:
1088                 stcb->asoc.peer_supports_nat = 0;
1089                 break;
1090         case SCTP_ADD_IP_ADDRESS:
1091         case SCTP_DEL_IP_ADDRESS:
1092         case SCTP_SET_PRIM_ADDR:
1093                 stcb->asoc.peer_supports_asconf = 0;
1094                 break;
1095         case SCTP_SUCCESS_REPORT:
1096         case SCTP_ERROR_CAUSE_IND:
1097                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1098                 SCTPDBG(SCTP_DEBUG_INPUT2,
1099                     "Turning off ASCONF to this strange peer\n");
1100                 stcb->asoc.peer_supports_asconf = 0;
1101                 break;
1102         default:
1103                 SCTPDBG(SCTP_DEBUG_INPUT2,
1104                     "Peer does not support param type %d(%x)??\n",
1105                     pbad->param_type, (uint32_t) pbad->param_type);
1106                 break;
1107         }
1108 }
1109
1110 static int
1111 sctp_handle_error(struct sctp_chunkhdr *ch,
1112     struct sctp_tcb *stcb, struct sctp_nets *net)
1113 {
1114         int chklen;
1115         struct sctp_paramhdr *phdr;
1116         uint16_t error_type;
1117         uint16_t error_len;
1118         struct sctp_association *asoc;
1119         int adjust;
1120
1121 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1122         struct socket *so;
1123
1124 #endif
1125
1126         /* parse through all of the errors and process */
1127         asoc = &stcb->asoc;
1128         phdr = (struct sctp_paramhdr *)((caddr_t)ch +
1129             sizeof(struct sctp_chunkhdr));
1130         chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr);
1131         while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) {
1132                 /* Process an Error Cause */
1133                 error_type = ntohs(phdr->param_type);
1134                 error_len = ntohs(phdr->param_length);
1135                 if ((error_len > chklen) || (error_len == 0)) {
1136                         /* invalid param length for this param */
1137                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n",
1138                             chklen, error_len);
1139                         return (0);
1140                 }
1141                 switch (error_type) {
1142                 case SCTP_CAUSE_INVALID_STREAM:
1143                 case SCTP_CAUSE_MISSING_PARAM:
1144                 case SCTP_CAUSE_INVALID_PARAM:
1145                 case SCTP_CAUSE_NO_USER_DATA:
1146                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n",
1147                             error_type);
1148                         break;
1149                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1150                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
1151                             ch->chunk_flags);
1152                         if (sctp_handle_nat_colliding_state(stcb)) {
1153                                 return (0);
1154                         }
1155                         break;
1156                 case SCTP_CAUSE_NAT_MISSING_STATE:
1157                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
1158                             ch->chunk_flags);
1159                         if (sctp_handle_nat_missing_state(stcb, net)) {
1160                                 return (0);
1161                         }
1162                         break;
1163                 case SCTP_CAUSE_STALE_COOKIE:
1164                         /*
1165                          * We only act if we have echoed a cookie and are
1166                          * waiting.
1167                          */
1168                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
1169                                 int *p;
1170
1171                                 p = (int *)((caddr_t)phdr + sizeof(*phdr));
1172                                 /* Save the time doubled */
1173                                 asoc->cookie_preserve_req = ntohl(*p) << 1;
1174                                 asoc->stale_cookie_count++;
1175                                 if (asoc->stale_cookie_count >
1176                                     asoc->max_init_times) {
1177                                         sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED);
1178                                         /* now free the asoc */
1179 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1180                                         so = SCTP_INP_SO(stcb->sctp_ep);
1181                                         atomic_add_int(&stcb->asoc.refcnt, 1);
1182                                         SCTP_TCB_UNLOCK(stcb);
1183                                         SCTP_SOCKET_LOCK(so, 1);
1184                                         SCTP_TCB_LOCK(stcb);
1185                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1186 #endif
1187                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1188                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1189 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1190                                         SCTP_SOCKET_UNLOCK(so, 1);
1191 #endif
1192                                         return (-1);
1193                                 }
1194                                 /* blast back to INIT state */
1195                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
1196                                 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED;
1197                                 asoc->state |= SCTP_STATE_COOKIE_WAIT;
1198                                 sctp_stop_all_cookie_timers(stcb);
1199                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1200                         }
1201                         break;
1202                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1203                         /*
1204                          * Nothing we can do here, we don't do hostname
1205                          * addresses so if the peer does not like my IPv6
1206                          * (or IPv4 for that matter) it does not matter. If
1207                          * they don't support that type of address, they can
1208                          * NOT possibly get that packet type... i.e. with no
1209                          * IPv6 you can't recieve a IPv6 packet. so we can
1210                          * safely ignore this one. If we ever added support
1211                          * for HOSTNAME Addresses, then we would need to do
1212                          * something here.
1213                          */
1214                         break;
1215                 case SCTP_CAUSE_UNRECOG_CHUNK:
1216                         sctp_process_unrecog_chunk(stcb, phdr, net);
1217                         break;
1218                 case SCTP_CAUSE_UNRECOG_PARAM:
1219                         sctp_process_unrecog_param(stcb, phdr);
1220                         break;
1221                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1222                         /*
1223                          * We ignore this since the timer will drive out a
1224                          * new cookie anyway and there timer will drive us
1225                          * to send a SHUTDOWN_COMPLETE. We can't send one
1226                          * here since we don't have their tag.
1227                          */
1228                         break;
1229                 case SCTP_CAUSE_DELETING_LAST_ADDR:
1230                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1231                 case SCTP_CAUSE_DELETING_SRC_ADDR:
1232                         /*
1233                          * We should NOT get these here, but in a
1234                          * ASCONF-ACK.
1235                          */
1236                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n",
1237                             error_type);
1238                         break;
1239                 case SCTP_CAUSE_OUT_OF_RESC:
1240                         /*
1241                          * And what, pray tell do we do with the fact that
1242                          * the peer is out of resources? Not really sure we
1243                          * could do anything but abort. I suspect this
1244                          * should have came WITH an abort instead of in a
1245                          * OP-ERROR.
1246                          */
1247                         break;
1248                 default:
1249                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n",
1250                             error_type);
1251                         break;
1252                 }
1253                 adjust = SCTP_SIZE32(error_len);
1254                 chklen -= adjust;
1255                 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust);
1256         }
1257         return (0);
1258 }
1259
1260 static int
1261 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1262     struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1263     struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id)
1264 {
1265         struct sctp_init_ack *init_ack;
1266         struct mbuf *op_err;
1267
1268         SCTPDBG(SCTP_DEBUG_INPUT2,
1269             "sctp_handle_init_ack: handling INIT-ACK\n");
1270
1271         if (stcb == NULL) {
1272                 SCTPDBG(SCTP_DEBUG_INPUT2,
1273                     "sctp_handle_init_ack: TCB is null\n");
1274                 return (-1);
1275         }
1276         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1277                 /* Invalid length */
1278                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1279                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1280                     op_err, 0, net->port);
1281                 *abort_no_unlock = 1;
1282                 return (-1);
1283         }
1284         init_ack = &cp->init;
1285         /* validate parameters */
1286         if (init_ack->initiate_tag == 0) {
1287                 /* protocol error... send an abort */
1288                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1289                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1290                     op_err, 0, net->port);
1291                 *abort_no_unlock = 1;
1292                 return (-1);
1293         }
1294         if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1295                 /* protocol error... send an abort */
1296                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1297                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1298                     op_err, 0, net->port);
1299                 *abort_no_unlock = 1;
1300                 return (-1);
1301         }
1302         if (init_ack->num_inbound_streams == 0) {
1303                 /* protocol error... send an abort */
1304                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1305                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1306                     op_err, 0, net->port);
1307                 *abort_no_unlock = 1;
1308                 return (-1);
1309         }
1310         if (init_ack->num_outbound_streams == 0) {
1311                 /* protocol error... send an abort */
1312                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1313                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1314                     op_err, 0, net->port);
1315                 *abort_no_unlock = 1;
1316                 return (-1);
1317         }
1318         /* process according to association state... */
1319         switch (stcb->asoc.state & SCTP_STATE_MASK) {
1320         case SCTP_STATE_COOKIE_WAIT:
1321                 /* this is the expected state for this chunk */
1322                 /* process the INIT-ACK parameters */
1323                 if (stcb->asoc.primary_destination->dest_state &
1324                     SCTP_ADDR_UNCONFIRMED) {
1325                         /*
1326                          * The primary is where we sent the INIT, we can
1327                          * always consider it confirmed when the INIT-ACK is
1328                          * returned. Do this before we load addresses
1329                          * though.
1330                          */
1331                         stcb->asoc.primary_destination->dest_state &=
1332                             ~SCTP_ADDR_UNCONFIRMED;
1333                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1334                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1335                 }
1336                 if (sctp_process_init_ack(m, iphlen, offset, sh, cp, stcb,
1337                     net, abort_no_unlock, vrf_id) < 0) {
1338                         /* error in parsing parameters */
1339                         return (-1);
1340                 }
1341                 /* update our state */
1342                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1343                 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED);
1344
1345                 /* reset the RTO calc */
1346                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1347                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1348                             stcb->asoc.overall_error_count,
1349                             0,
1350                             SCTP_FROM_SCTP_INPUT,
1351                             __LINE__);
1352                 }
1353                 stcb->asoc.overall_error_count = 0;
1354                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1355                 /*
1356                  * collapse the init timer back in case of a exponential
1357                  * backoff
1358                  */
1359                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1360                     stcb, net);
1361                 /*
1362                  * the send at the end of the inbound data processing will
1363                  * cause the cookie to be sent
1364                  */
1365                 break;
1366         case SCTP_STATE_SHUTDOWN_SENT:
1367                 /* incorrect state... discard */
1368                 break;
1369         case SCTP_STATE_COOKIE_ECHOED:
1370                 /* incorrect state... discard */
1371                 break;
1372         case SCTP_STATE_OPEN:
1373                 /* incorrect state... discard */
1374                 break;
1375         case SCTP_STATE_EMPTY:
1376         case SCTP_STATE_INUSE:
1377         default:
1378                 /* incorrect state... discard */
1379                 return (-1);
1380                 break;
1381         }
1382         SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1383         return (0);
1384 }
1385
1386 static struct sctp_tcb *
1387 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1388     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1389     struct sctp_inpcb *inp, struct sctp_nets **netp,
1390     struct sockaddr *init_src, int *notification,
1391     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1392     uint32_t vrf_id, uint16_t port);
1393
1394
1395 /*
1396  * handle a state cookie for an existing association m: input packet mbuf
1397  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1398  * "split" mbuf and the cookie signature does not exist offset: offset into
1399  * mbuf to the cookie-echo chunk
1400  */
1401 static struct sctp_tcb *
1402 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1403     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1404     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1405     struct sockaddr *init_src, int *notification,
1406     uint32_t vrf_id, int auth_skipped, uint32_t auth_offset, uint32_t auth_len, uint16_t port)
1407 {
1408         struct sctp_association *asoc;
1409         struct sctp_init_chunk *init_cp, init_buf;
1410         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1411         struct sctp_nets *net;
1412         struct mbuf *op_err;
1413         struct sctp_paramhdr *ph;
1414         int init_offset, initack_offset, i;
1415         int retval;
1416         int spec_flag = 0;
1417         uint32_t how_indx;
1418
1419         net = *netp;
1420         /* I know that the TCB is non-NULL from the caller */
1421         asoc = &stcb->asoc;
1422         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1423                 if (asoc->cookie_how[how_indx] == 0)
1424                         break;
1425         }
1426         if (how_indx < sizeof(asoc->cookie_how)) {
1427                 asoc->cookie_how[how_indx] = 1;
1428         }
1429         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1430                 /* SHUTDOWN came in after sending INIT-ACK */
1431                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1432                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
1433                     0, M_DONTWAIT, 1, MT_DATA);
1434                 if (op_err == NULL) {
1435                         /* FOOBAR */
1436                         return (NULL);
1437                 }
1438                 /* Set the len */
1439                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr);
1440                 ph = mtod(op_err, struct sctp_paramhdr *);
1441                 ph->param_type = htons(SCTP_CAUSE_COOKIE_IN_SHUTDOWN);
1442                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
1443                 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag,
1444                     vrf_id, net->port);
1445                 if (how_indx < sizeof(asoc->cookie_how))
1446                         asoc->cookie_how[how_indx] = 2;
1447                 return (NULL);
1448         }
1449         /*
1450          * find and validate the INIT chunk in the cookie (peer's info) the
1451          * INIT should start after the cookie-echo header struct (chunk
1452          * header, state cookie header struct)
1453          */
1454         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1455
1456         init_cp = (struct sctp_init_chunk *)
1457             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1458             (uint8_t *) & init_buf);
1459         if (init_cp == NULL) {
1460                 /* could not pull a INIT chunk in cookie */
1461                 return (NULL);
1462         }
1463         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1464                 return (NULL);
1465         }
1466         /*
1467          * find and validate the INIT-ACK chunk in the cookie (my info) the
1468          * INIT-ACK follows the INIT chunk
1469          */
1470         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1471         initack_cp = (struct sctp_init_ack_chunk *)
1472             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1473             (uint8_t *) & initack_buf);
1474         if (initack_cp == NULL) {
1475                 /* could not pull INIT-ACK chunk in cookie */
1476                 return (NULL);
1477         }
1478         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1479                 return (NULL);
1480         }
1481         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1482             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1483                 /*
1484                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
1485                  * to get into the OPEN state
1486                  */
1487                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1488                         /*-
1489                          * Opps, this means that we somehow generated two vtag's
1490                          * the same. I.e. we did:
1491                          *  Us               Peer
1492                          *   <---INIT(tag=a)------
1493                          *   ----INIT-ACK(tag=t)-->
1494                          *   ----INIT(tag=t)------> *1
1495                          *   <---INIT-ACK(tag=a)---
1496                          *   <----CE(tag=t)------------- *2
1497                          *
1498                          * At point *1 we should be generating a different
1499                          * tag t'. Which means we would throw away the CE and send
1500                          * ours instead. Basically this is case C (throw away side).
1501                          */
1502                         if (how_indx < sizeof(asoc->cookie_how))
1503                                 asoc->cookie_how[how_indx] = 17;
1504                         return (NULL);
1505
1506                 }
1507                 switch SCTP_GET_STATE
1508                         (asoc) {
1509                 case SCTP_STATE_COOKIE_WAIT:
1510                 case SCTP_STATE_COOKIE_ECHOED:
1511                         /*
1512                          * INIT was sent but got a COOKIE_ECHO with the
1513                          * correct tags... just accept it...but we must
1514                          * process the init so that we can make sure we have
1515                          * the right seq no's.
1516                          */
1517                         /* First we must process the INIT !! */
1518                         retval = sctp_process_init(init_cp, stcb);
1519                         if (retval < 0) {
1520                                 if (how_indx < sizeof(asoc->cookie_how))
1521                                         asoc->cookie_how[how_indx] = 3;
1522                                 return (NULL);
1523                         }
1524                         /* we have already processed the INIT so no problem */
1525                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb,
1526                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1527                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1528                         /* update current state */
1529                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1530                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1531                         else
1532                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1533
1534                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1535                         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1536                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1537                                     stcb->sctp_ep, stcb, asoc->primary_destination);
1538                         }
1539                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1540                         sctp_stop_all_cookie_timers(stcb);
1541                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1542                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1543                             (inp->sctp_socket->so_qlimit == 0)
1544                             ) {
1545 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1546                                 struct socket *so;
1547
1548 #endif
1549                                 /*
1550                                  * Here is where collision would go if we
1551                                  * did a connect() and instead got a
1552                                  * init/init-ack/cookie done before the
1553                                  * init-ack came back..
1554                                  */
1555                                 stcb->sctp_ep->sctp_flags |=
1556                                     SCTP_PCB_FLAGS_CONNECTED;
1557 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1558                                 so = SCTP_INP_SO(stcb->sctp_ep);
1559                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1560                                 SCTP_TCB_UNLOCK(stcb);
1561                                 SCTP_SOCKET_LOCK(so, 1);
1562                                 SCTP_TCB_LOCK(stcb);
1563                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1564                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1565                                         SCTP_SOCKET_UNLOCK(so, 1);
1566                                         return (NULL);
1567                                 }
1568 #endif
1569                                 soisconnected(stcb->sctp_socket);
1570 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1571                                 SCTP_SOCKET_UNLOCK(so, 1);
1572 #endif
1573                         }
1574                         /* notify upper layer */
1575                         *notification = SCTP_NOTIFY_ASSOC_UP;
1576                         /*
1577                          * since we did not send a HB make sure we don't
1578                          * double things
1579                          */
1580                         net->hb_responded = 1;
1581                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
1582                             &cookie->time_entered,
1583                             sctp_align_unsafe_makecopy,
1584                             SCTP_RTT_FROM_NON_DATA);
1585
1586                         if (stcb->asoc.sctp_autoclose_ticks &&
1587                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1588                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1589                                     inp, stcb, NULL);
1590                         }
1591                         break;
1592                 default:
1593                         /*
1594                          * we're in the OPEN state (or beyond), so peer must
1595                          * have simply lost the COOKIE-ACK
1596                          */
1597                         break;
1598                         }       /* end switch */
1599                 sctp_stop_all_cookie_timers(stcb);
1600                 /*
1601                  * We ignore the return code here.. not sure if we should
1602                  * somehow abort.. but we do have an existing asoc. This
1603                  * really should not fail.
1604                  */
1605                 if (sctp_load_addresses_from_init(stcb, m,
1606                     init_offset + sizeof(struct sctp_init_chunk),
1607                     initack_offset, sh, init_src)) {
1608                         if (how_indx < sizeof(asoc->cookie_how))
1609                                 asoc->cookie_how[how_indx] = 4;
1610                         return (NULL);
1611                 }
1612                 /* respond with a COOKIE-ACK */
1613                 sctp_toss_old_cookies(stcb, asoc);
1614                 sctp_send_cookie_ack(stcb);
1615                 if (how_indx < sizeof(asoc->cookie_how))
1616                         asoc->cookie_how[how_indx] = 5;
1617                 return (stcb);
1618         }
1619         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1620             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1621             cookie->tie_tag_my_vtag == 0 &&
1622             cookie->tie_tag_peer_vtag == 0) {
1623                 /*
1624                  * case C in Section 5.2.4 Table 2: XMOO silently discard
1625                  */
1626                 if (how_indx < sizeof(asoc->cookie_how))
1627                         asoc->cookie_how[how_indx] = 6;
1628                 return (NULL);
1629         }
1630         /*
1631          * If nat support, and the below and stcb is established, send back
1632          * a ABORT(colliding state) if we are established.
1633          */
1634         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) &&
1635             (asoc->peer_supports_nat) &&
1636             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1637             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1638             (asoc->peer_vtag == 0)))) {
1639                 /*
1640                  * Special case - Peer's support nat. We may have two init's
1641                  * that we gave out the same tag on since one was not
1642                  * established.. i.e. we get INIT from host-1 behind the nat
1643                  * and we respond tag-a, we get a INIT from host-2 behind
1644                  * the nat and we get tag-a again. Then we bring up host-1
1645                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1646                  * Now we have colliding state. We must send an abort here
1647                  * with colliding state indication.
1648                  */
1649                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
1650                     0, M_DONTWAIT, 1, MT_DATA);
1651                 if (op_err == NULL) {
1652                         /* FOOBAR */
1653                         return (NULL);
1654                 }
1655                 /* pre-reserve some space */
1656 #ifdef INET6
1657                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
1658 #else
1659                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
1660 #endif
1661                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
1662                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
1663                 /* Set the len */
1664                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr);
1665                 ph = mtod(op_err, struct sctp_paramhdr *);
1666                 ph->param_type = htons(SCTP_CAUSE_NAT_COLLIDING_STATE);
1667                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
1668                 sctp_send_abort(m, iphlen, sh, 0, op_err, vrf_id, port);
1669                 return (NULL);
1670         }
1671         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1672             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1673             (asoc->peer_vtag == 0))) {
1674                 /*
1675                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1676                  * should be ok, re-accept peer info
1677                  */
1678                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1679                         /*
1680                          * Extension of case C. If we hit this, then the
1681                          * random number generator returned the same vtag
1682                          * when we first sent our INIT-ACK and when we later
1683                          * sent our INIT. The side with the seq numbers that
1684                          * are different will be the one that normnally
1685                          * would have hit case C. This in effect "extends"
1686                          * our vtags in this collision case to be 64 bits.
1687                          * The same collision could occur aka you get both
1688                          * vtag and seq number the same twice in a row.. but
1689                          * is much less likely. If it did happen then we
1690                          * would proceed through and bring up the assoc.. we
1691                          * may end up with the wrong stream setup however..
1692                          * which would be bad.. but there is no way to
1693                          * tell.. until we send on a stream that does not
1694                          * exist :-)
1695                          */
1696                         if (how_indx < sizeof(asoc->cookie_how))
1697                                 asoc->cookie_how[how_indx] = 7;
1698
1699                         return (NULL);
1700                 }
1701                 if (how_indx < sizeof(asoc->cookie_how))
1702                         asoc->cookie_how[how_indx] = 8;
1703                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1704                 sctp_stop_all_cookie_timers(stcb);
1705                 /*
1706                  * since we did not send a HB make sure we don't double
1707                  * things
1708                  */
1709                 net->hb_responded = 1;
1710                 if (stcb->asoc.sctp_autoclose_ticks &&
1711                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1712                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1713                             NULL);
1714                 }
1715                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1716                 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1717
1718                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1719                         /*
1720                          * Ok the peer probably discarded our data (if we
1721                          * echoed a cookie+data). So anything on the
1722                          * sent_queue should be marked for retransmit, we
1723                          * may not get something to kick us so it COULD
1724                          * still take a timeout to move these.. but it can't
1725                          * hurt to mark them.
1726                          */
1727                         struct sctp_tmit_chunk *chk;
1728
1729                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1730                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1731                                         chk->sent = SCTP_DATAGRAM_RESEND;
1732                                         sctp_flight_size_decrease(chk);
1733                                         sctp_total_flight_decrease(stcb, chk);
1734                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1735                                         spec_flag++;
1736                                 }
1737                         }
1738
1739                 }
1740                 /* process the INIT info (peer's info) */
1741                 retval = sctp_process_init(init_cp, stcb);
1742                 if (retval < 0) {
1743                         if (how_indx < sizeof(asoc->cookie_how))
1744                                 asoc->cookie_how[how_indx] = 9;
1745                         return (NULL);
1746                 }
1747                 if (sctp_load_addresses_from_init(stcb, m,
1748                     init_offset + sizeof(struct sctp_init_chunk),
1749                     initack_offset, sh, init_src)) {
1750                         if (how_indx < sizeof(asoc->cookie_how))
1751                                 asoc->cookie_how[how_indx] = 10;
1752                         return (NULL);
1753                 }
1754                 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) ||
1755                     (asoc->state & SCTP_STATE_COOKIE_ECHOED)) {
1756                         *notification = SCTP_NOTIFY_ASSOC_UP;
1757
1758                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1759                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1760                             (inp->sctp_socket->so_qlimit == 0)) {
1761 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1762                                 struct socket *so;
1763
1764 #endif
1765                                 stcb->sctp_ep->sctp_flags |=
1766                                     SCTP_PCB_FLAGS_CONNECTED;
1767 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1768                                 so = SCTP_INP_SO(stcb->sctp_ep);
1769                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1770                                 SCTP_TCB_UNLOCK(stcb);
1771                                 SCTP_SOCKET_LOCK(so, 1);
1772                                 SCTP_TCB_LOCK(stcb);
1773                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1774                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1775                                         SCTP_SOCKET_UNLOCK(so, 1);
1776                                         return (NULL);
1777                                 }
1778 #endif
1779                                 soisconnected(stcb->sctp_socket);
1780 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1781                                 SCTP_SOCKET_UNLOCK(so, 1);
1782 #endif
1783                         }
1784                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1785                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1786                         else
1787                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1788                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1789                 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1790                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1791                 } else {
1792                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1793                 }
1794                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1795                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1796                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1797                             stcb->sctp_ep, stcb, asoc->primary_destination);
1798                 }
1799                 sctp_stop_all_cookie_timers(stcb);
1800                 sctp_toss_old_cookies(stcb, asoc);
1801                 sctp_send_cookie_ack(stcb);
1802                 if (spec_flag) {
1803                         /*
1804                          * only if we have retrans set do we do this. What
1805                          * this call does is get only the COOKIE-ACK out and
1806                          * then when we return the normal call to
1807                          * sctp_chunk_output will get the retrans out behind
1808                          * this.
1809                          */
1810                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1811                 }
1812                 if (how_indx < sizeof(asoc->cookie_how))
1813                         asoc->cookie_how[how_indx] = 11;
1814
1815                 return (stcb);
1816         }
1817         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1818             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1819             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1820             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1821             cookie->tie_tag_peer_vtag != 0) {
1822                 struct sctpasochead *head;
1823
1824                 if (asoc->peer_supports_nat) {
1825                         /*
1826                          * This is a gross gross hack. just call the
1827                          * cookie_new code since we are allowing a duplicate
1828                          * association. I hope this works...
1829                          */
1830                         return (sctp_process_cookie_new(m, iphlen, offset, sh, cookie, cookie_len,
1831                             inp, netp, init_src, notification,
1832                             auth_skipped, auth_offset, auth_len,
1833                             vrf_id, port));
1834                 }
1835                 /*
1836                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1837                  */
1838                 /* temp code */
1839                 if (how_indx < sizeof(asoc->cookie_how))
1840                         asoc->cookie_how[how_indx] = 12;
1841                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1842                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1843
1844                 /* notify upper layer */
1845                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1846                 atomic_add_int(&stcb->asoc.refcnt, 1);
1847                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) &&
1848                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1849                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
1850                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1851                 }
1852                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1853                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1854                 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1855                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1856                 }
1857                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1858                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1859                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1860                             stcb->sctp_ep, stcb, asoc->primary_destination);
1861
1862                 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) {
1863                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1864                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1865                 }
1866                 asoc->pre_open_streams =
1867                     ntohs(initack_cp->init.num_outbound_streams);
1868                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1869                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1870                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1871
1872                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1873
1874                 asoc->str_reset_seq_in = asoc->init_seq_number;
1875
1876                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1877                 if (asoc->mapping_array) {
1878                         memset(asoc->mapping_array, 0,
1879                             asoc->mapping_array_size);
1880                 }
1881                 if (asoc->nr_mapping_array) {
1882                         memset(asoc->nr_mapping_array, 0,
1883                             asoc->mapping_array_size);
1884                 }
1885                 SCTP_TCB_UNLOCK(stcb);
1886                 SCTP_INP_INFO_WLOCK();
1887                 SCTP_INP_WLOCK(stcb->sctp_ep);
1888                 SCTP_TCB_LOCK(stcb);
1889                 atomic_add_int(&stcb->asoc.refcnt, -1);
1890                 /* send up all the data */
1891                 SCTP_TCB_SEND_LOCK(stcb);
1892
1893                 sctp_report_all_outbound(stcb, 1, SCTP_SO_NOT_LOCKED);
1894                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1895                         stcb->asoc.strmout[i].stream_no = i;
1896                         stcb->asoc.strmout[i].next_sequence_sent = 0;
1897                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
1898                 }
1899                 /* process the INIT-ACK info (my info) */
1900                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1901                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1902
1903                 /* pull from vtag hash */
1904                 LIST_REMOVE(stcb, sctp_asocs);
1905                 /* re-insert to new vtag position */
1906                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1907                     SCTP_BASE_INFO(hashasocmark))];
1908                 /*
1909                  * put it in the bucket in the vtag hash of assoc's for the
1910                  * system
1911                  */
1912                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
1913
1914                 /* process the INIT info (peer's info) */
1915                 SCTP_TCB_SEND_UNLOCK(stcb);
1916                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
1917                 SCTP_INP_INFO_WUNLOCK();
1918
1919                 retval = sctp_process_init(init_cp, stcb);
1920                 if (retval < 0) {
1921                         if (how_indx < sizeof(asoc->cookie_how))
1922                                 asoc->cookie_how[how_indx] = 13;
1923
1924                         return (NULL);
1925                 }
1926                 /*
1927                  * since we did not send a HB make sure we don't double
1928                  * things
1929                  */
1930                 net->hb_responded = 1;
1931
1932                 if (sctp_load_addresses_from_init(stcb, m,
1933                     init_offset + sizeof(struct sctp_init_chunk),
1934                     initack_offset, sh, init_src)) {
1935                         if (how_indx < sizeof(asoc->cookie_how))
1936                                 asoc->cookie_how[how_indx] = 14;
1937
1938                         return (NULL);
1939                 }
1940                 /* respond with a COOKIE-ACK */
1941                 sctp_stop_all_cookie_timers(stcb);
1942                 sctp_toss_old_cookies(stcb, asoc);
1943                 sctp_send_cookie_ack(stcb);
1944                 if (how_indx < sizeof(asoc->cookie_how))
1945                         asoc->cookie_how[how_indx] = 15;
1946
1947                 return (stcb);
1948         }
1949         if (how_indx < sizeof(asoc->cookie_how))
1950                 asoc->cookie_how[how_indx] = 16;
1951         /* all other cases... */
1952         return (NULL);
1953 }
1954
1955
1956 /*
1957  * handle a state cookie for a new association m: input packet mbuf chain--
1958  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
1959  * and the cookie signature does not exist offset: offset into mbuf to the
1960  * cookie-echo chunk length: length of the cookie chunk to: where the init
1961  * was from returns a new TCB
1962  */
1963 struct sctp_tcb *
1964 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1965     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1966     struct sctp_inpcb *inp, struct sctp_nets **netp,
1967     struct sockaddr *init_src, int *notification,
1968     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1969     uint32_t vrf_id, uint16_t port)
1970 {
1971         struct sctp_tcb *stcb;
1972         struct sctp_init_chunk *init_cp, init_buf;
1973         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1974         struct sockaddr_storage sa_store;
1975         struct sockaddr *initack_src = (struct sockaddr *)&sa_store;
1976         struct sctp_association *asoc;
1977         int init_offset, initack_offset, initack_limit;
1978         int retval;
1979         int error = 0;
1980         uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
1981
1982 #ifdef INET
1983         struct sockaddr_in *sin;
1984
1985 #endif
1986 #ifdef INET6
1987         struct sockaddr_in6 *sin6;
1988
1989 #endif
1990 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1991         struct socket *so;
1992
1993         so = SCTP_INP_SO(inp);
1994 #endif
1995
1996         /*
1997          * find and validate the INIT chunk in the cookie (peer's info) the
1998          * INIT should start after the cookie-echo header struct (chunk
1999          * header, state cookie header struct)
2000          */
2001         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
2002         init_cp = (struct sctp_init_chunk *)
2003             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
2004             (uint8_t *) & init_buf);
2005         if (init_cp == NULL) {
2006                 /* could not pull a INIT chunk in cookie */
2007                 SCTPDBG(SCTP_DEBUG_INPUT1,
2008                     "process_cookie_new: could not pull INIT chunk hdr\n");
2009                 return (NULL);
2010         }
2011         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
2012                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
2013                 return (NULL);
2014         }
2015         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
2016         /*
2017          * find and validate the INIT-ACK chunk in the cookie (my info) the
2018          * INIT-ACK follows the INIT chunk
2019          */
2020         initack_cp = (struct sctp_init_ack_chunk *)
2021             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
2022             (uint8_t *) & initack_buf);
2023         if (initack_cp == NULL) {
2024                 /* could not pull INIT-ACK chunk in cookie */
2025                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2026                 return (NULL);
2027         }
2028         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2029                 return (NULL);
2030         }
2031         /*
2032          * NOTE: We can't use the INIT_ACK's chk_length to determine the
2033          * "initack_limit" value.  This is because the chk_length field
2034          * includes the length of the cookie, but the cookie is omitted when
2035          * the INIT and INIT_ACK are tacked onto the cookie...
2036          */
2037         initack_limit = offset + cookie_len;
2038
2039         /*
2040          * now that we know the INIT/INIT-ACK are in place, create a new TCB
2041          * and popluate
2042          */
2043
2044         /*
2045          * Here we do a trick, we set in NULL for the proc/thread argument.
2046          * We do this since in effect we only use the p argument when the
2047          * socket is unbound and we must do an implicit bind. Since we are
2048          * getting a cookie, we cannot be unbound.
2049          */
2050         stcb = sctp_aloc_assoc(inp, init_src, &error,
2051             ntohl(initack_cp->init.initiate_tag), vrf_id,
2052             (struct thread *)NULL
2053             );
2054         if (stcb == NULL) {
2055                 struct mbuf *op_err;
2056
2057                 /* memory problem? */
2058                 SCTPDBG(SCTP_DEBUG_INPUT1,
2059                     "process_cookie_new: no room for another TCB!\n");
2060                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2061
2062                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2063                     sh, op_err, vrf_id, port);
2064                 return (NULL);
2065         }
2066         /* get the correct sctp_nets */
2067         if (netp)
2068                 *netp = sctp_findnet(stcb, init_src);
2069
2070         asoc = &stcb->asoc;
2071         /* get scope variables out of cookie */
2072         asoc->ipv4_local_scope = cookie->ipv4_scope;
2073         asoc->site_scope = cookie->site_scope;
2074         asoc->local_scope = cookie->local_scope;
2075         asoc->loopback_scope = cookie->loopback_scope;
2076
2077         if ((asoc->ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2078             (asoc->ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2079                 struct mbuf *op_err;
2080
2081                 /*
2082                  * Houston we have a problem. The EP changed while the
2083                  * cookie was in flight. Only recourse is to abort the
2084                  * association.
2085                  */
2086                 atomic_add_int(&stcb->asoc.refcnt, 1);
2087                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2088                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2089                     sh, op_err, vrf_id, port);
2090 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2091                 SCTP_TCB_UNLOCK(stcb);
2092                 SCTP_SOCKET_LOCK(so, 1);
2093                 SCTP_TCB_LOCK(stcb);
2094 #endif
2095                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2096                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
2097 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2098                 SCTP_SOCKET_UNLOCK(so, 1);
2099 #endif
2100                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2101                 return (NULL);
2102         }
2103         /* process the INIT-ACK info (my info) */
2104         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2105         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2106         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2107         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2108         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2109         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2110         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2111         asoc->str_reset_seq_in = asoc->init_seq_number;
2112
2113         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2114
2115         /* process the INIT info (peer's info) */
2116         if (netp)
2117                 retval = sctp_process_init(init_cp, stcb);
2118         else
2119                 retval = 0;
2120         if (retval < 0) {
2121                 atomic_add_int(&stcb->asoc.refcnt, 1);
2122 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2123                 SCTP_TCB_UNLOCK(stcb);
2124                 SCTP_SOCKET_LOCK(so, 1);
2125                 SCTP_TCB_LOCK(stcb);
2126 #endif
2127                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
2128 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2129                 SCTP_SOCKET_UNLOCK(so, 1);
2130 #endif
2131                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2132                 return (NULL);
2133         }
2134         /* load all addresses */
2135         if (sctp_load_addresses_from_init(stcb, m,
2136             init_offset + sizeof(struct sctp_init_chunk), initack_offset, sh,
2137             init_src)) {
2138                 atomic_add_int(&stcb->asoc.refcnt, 1);
2139 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2140                 SCTP_TCB_UNLOCK(stcb);
2141                 SCTP_SOCKET_LOCK(so, 1);
2142                 SCTP_TCB_LOCK(stcb);
2143 #endif
2144                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
2145 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2146                 SCTP_SOCKET_UNLOCK(so, 1);
2147 #endif
2148                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2149                 return (NULL);
2150         }
2151         /*
2152          * verify any preceding AUTH chunk that was skipped
2153          */
2154         /* pull the local authentication parameters from the cookie/init-ack */
2155         sctp_auth_get_cookie_params(stcb, m,
2156             initack_offset + sizeof(struct sctp_init_ack_chunk),
2157             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2158         if (auth_skipped) {
2159                 struct sctp_auth_chunk *auth;
2160
2161                 auth = (struct sctp_auth_chunk *)
2162                     sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2163                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2164                         /* auth HMAC failed, dump the assoc and packet */
2165                         SCTPDBG(SCTP_DEBUG_AUTH1,
2166                             "COOKIE-ECHO: AUTH failed\n");
2167                         atomic_add_int(&stcb->asoc.refcnt, 1);
2168 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2169                         SCTP_TCB_UNLOCK(stcb);
2170                         SCTP_SOCKET_LOCK(so, 1);
2171                         SCTP_TCB_LOCK(stcb);
2172 #endif
2173                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2174 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2175                         SCTP_SOCKET_UNLOCK(so, 1);
2176 #endif
2177                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2178                         return (NULL);
2179                 } else {
2180                         /* remaining chunks checked... good to go */
2181                         stcb->asoc.authenticated = 1;
2182                 }
2183         }
2184         /* update current state */
2185         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2186         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2187         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2188                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2189                     stcb->sctp_ep, stcb, asoc->primary_destination);
2190         }
2191         sctp_stop_all_cookie_timers(stcb);
2192         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2193         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2194
2195         /*
2196          * if we're doing ASCONFs, check to see if we have any new local
2197          * addresses that need to get added to the peer (eg. addresses
2198          * changed while cookie echo in flight).  This needs to be done
2199          * after we go to the OPEN state to do the correct asconf
2200          * processing. else, make sure we have the correct addresses in our
2201          * lists
2202          */
2203
2204         /* warning, we re-use sin, sin6, sa_store here! */
2205         /* pull in local_address (our "from" address) */
2206         switch (cookie->laddr_type) {
2207 #ifdef INET
2208         case SCTP_IPV4_ADDRESS:
2209                 /* source addr is IPv4 */
2210                 sin = (struct sockaddr_in *)initack_src;
2211                 memset(sin, 0, sizeof(*sin));
2212                 sin->sin_family = AF_INET;
2213                 sin->sin_len = sizeof(struct sockaddr_in);
2214                 sin->sin_addr.s_addr = cookie->laddress[0];
2215                 break;
2216 #endif
2217 #ifdef INET6
2218         case SCTP_IPV6_ADDRESS:
2219                 /* source addr is IPv6 */
2220                 sin6 = (struct sockaddr_in6 *)initack_src;
2221                 memset(sin6, 0, sizeof(*sin6));
2222                 sin6->sin6_family = AF_INET6;
2223                 sin6->sin6_len = sizeof(struct sockaddr_in6);
2224                 sin6->sin6_scope_id = cookie->scope_id;
2225                 memcpy(&sin6->sin6_addr, cookie->laddress,
2226                     sizeof(sin6->sin6_addr));
2227                 break;
2228 #endif
2229         default:
2230                 atomic_add_int(&stcb->asoc.refcnt, 1);
2231 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2232                 SCTP_TCB_UNLOCK(stcb);
2233                 SCTP_SOCKET_LOCK(so, 1);
2234                 SCTP_TCB_LOCK(stcb);
2235 #endif
2236                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2237 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2238                 SCTP_SOCKET_UNLOCK(so, 1);
2239 #endif
2240                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2241                 return (NULL);
2242         }
2243
2244         /* set up to notify upper layer */
2245         *notification = SCTP_NOTIFY_ASSOC_UP;
2246         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2247             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2248             (inp->sctp_socket->so_qlimit == 0)) {
2249                 /*
2250                  * This is an endpoint that called connect() how it got a
2251                  * cookie that is NEW is a bit of a mystery. It must be that
2252                  * the INIT was sent, but before it got there.. a complete
2253                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2254                  * should have went to the other code.. not here.. oh well..
2255                  * a bit of protection is worth having..
2256                  */
2257                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2258 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2259                 atomic_add_int(&stcb->asoc.refcnt, 1);
2260                 SCTP_TCB_UNLOCK(stcb);
2261                 SCTP_SOCKET_LOCK(so, 1);
2262                 SCTP_TCB_LOCK(stcb);
2263                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2264                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2265                         SCTP_SOCKET_UNLOCK(so, 1);
2266                         return (NULL);
2267                 }
2268 #endif
2269                 soisconnected(stcb->sctp_socket);
2270 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2271                 SCTP_SOCKET_UNLOCK(so, 1);
2272 #endif
2273         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2274             (inp->sctp_socket->so_qlimit)) {
2275                 /*
2276                  * We don't want to do anything with this one. Since it is
2277                  * the listening guy. The timer will get started for
2278                  * accepted connections in the caller.
2279                  */
2280                 ;
2281         }
2282         /* since we did not send a HB make sure we don't double things */
2283         if ((netp) && (*netp))
2284                 (*netp)->hb_responded = 1;
2285
2286         if (stcb->asoc.sctp_autoclose_ticks &&
2287             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2288                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2289         }
2290         /* calculate the RTT */
2291         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2292         if ((netp) && (*netp)) {
2293                 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
2294                     &cookie->time_entered, sctp_align_unsafe_makecopy,
2295                     SCTP_RTT_FROM_NON_DATA);
2296         }
2297         /* respond with a COOKIE-ACK */
2298         sctp_send_cookie_ack(stcb);
2299
2300         /*
2301          * check the address lists for any ASCONFs that need to be sent
2302          * AFTER the cookie-ack is sent
2303          */
2304         sctp_check_address_list(stcb, m,
2305             initack_offset + sizeof(struct sctp_init_ack_chunk),
2306             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2307             initack_src, cookie->local_scope, cookie->site_scope,
2308             cookie->ipv4_scope, cookie->loopback_scope);
2309
2310
2311         return (stcb);
2312 }
2313
2314 /*
2315  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2316  * we NEED to make sure we are not already using the vtag. If so we
2317  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2318         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2319                                                             SCTP_BASE_INFO(hashasocmark))];
2320         LIST_FOREACH(stcb, head, sctp_asocs) {
2321                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2322                        -- SEND ABORT - TRY AGAIN --
2323                 }
2324         }
2325 */
2326
2327 /*
2328  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2329  * existing (non-NULL) TCB
2330  */
2331 static struct mbuf *
2332 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2333     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2334     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2335     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2336     struct sctp_tcb **locked_tcb, uint32_t vrf_id, uint16_t port)
2337 {
2338         struct sctp_state_cookie *cookie;
2339         struct sctp_tcb *l_stcb = *stcb;
2340         struct sctp_inpcb *l_inp;
2341         struct sockaddr *to;
2342         struct sctp_pcb *ep;
2343         struct mbuf *m_sig;
2344         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2345         uint8_t *sig;
2346         uint8_t cookie_ok = 0;
2347         unsigned int size_of_pkt, sig_offset, cookie_offset;
2348         unsigned int cookie_len;
2349         struct timeval now;
2350         struct timeval time_expires;
2351         struct sockaddr_storage dest_store;
2352         struct sockaddr *localep_sa = (struct sockaddr *)&dest_store;
2353         struct ip *iph;
2354         int notification = 0;
2355         struct sctp_nets *netl;
2356         int had_a_existing_tcb = 0;
2357         int send_int_conf = 0;
2358
2359 #ifdef INET
2360         struct sockaddr_in sin;
2361
2362 #endif
2363 #ifdef INET6
2364         struct sockaddr_in6 sin6;
2365
2366 #endif
2367
2368         SCTPDBG(SCTP_DEBUG_INPUT2,
2369             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2370
2371         if (inp_p == NULL) {
2372                 return (NULL);
2373         }
2374         /* First get the destination address setup too. */
2375         iph = mtod(m, struct ip *);
2376         switch (iph->ip_v) {
2377 #ifdef INET
2378         case IPVERSION:
2379                 {
2380                         /* its IPv4 */
2381                         struct sockaddr_in *lsin;
2382
2383                         lsin = (struct sockaddr_in *)(localep_sa);
2384                         memset(lsin, 0, sizeof(*lsin));
2385                         lsin->sin_family = AF_INET;
2386                         lsin->sin_len = sizeof(*lsin);
2387                         lsin->sin_port = sh->dest_port;
2388                         lsin->sin_addr.s_addr = iph->ip_dst.s_addr;
2389                         size_of_pkt = SCTP_GET_IPV4_LENGTH(iph);
2390                         break;
2391                 }
2392 #endif
2393 #ifdef INET6
2394         case IPV6_VERSION >> 4:
2395                 {
2396                         /* its IPv6 */
2397                         struct ip6_hdr *ip6;
2398                         struct sockaddr_in6 *lsin6;
2399
2400                         lsin6 = (struct sockaddr_in6 *)(localep_sa);
2401                         memset(lsin6, 0, sizeof(*lsin6));
2402                         lsin6->sin6_family = AF_INET6;
2403                         lsin6->sin6_len = sizeof(struct sockaddr_in6);
2404                         ip6 = mtod(m, struct ip6_hdr *);
2405                         lsin6->sin6_port = sh->dest_port;
2406                         lsin6->sin6_addr = ip6->ip6_dst;
2407                         size_of_pkt = SCTP_GET_IPV6_LENGTH(ip6) + iphlen;
2408                         break;
2409                 }
2410 #endif
2411         default:
2412                 return (NULL);
2413         }
2414
2415         cookie = &cp->cookie;
2416         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2417         cookie_len = ntohs(cp->ch.chunk_length);
2418
2419         if ((cookie->peerport != sh->src_port) &&
2420             (cookie->myport != sh->dest_port) &&
2421             (cookie->my_vtag != sh->v_tag)) {
2422                 /*
2423                  * invalid ports or bad tag.  Note that we always leave the
2424                  * v_tag in the header in network order and when we stored
2425                  * it in the my_vtag slot we also left it in network order.
2426                  * This maintains the match even though it may be in the
2427                  * opposite byte order of the machine :->
2428                  */
2429                 return (NULL);
2430         }
2431         if (cookie_len > size_of_pkt ||
2432             cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2433             sizeof(struct sctp_init_chunk) +
2434             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2435                 /* cookie too long!  or too small */
2436                 return (NULL);
2437         }
2438         /*
2439          * split off the signature into its own mbuf (since it should not be
2440          * calculated in the sctp_hmac_m() call).
2441          */
2442         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2443         if (sig_offset > size_of_pkt) {
2444                 /* packet not correct size! */
2445                 /* XXX this may already be accounted for earlier... */
2446                 return (NULL);
2447         }
2448         m_sig = m_split(m, sig_offset, M_DONTWAIT);
2449         if (m_sig == NULL) {
2450                 /* out of memory or ?? */
2451                 return (NULL);
2452         }
2453 #ifdef SCTP_MBUF_LOGGING
2454         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2455                 struct mbuf *mat;
2456
2457                 for (mat = m_sig; mat; mat = SCTP_BUF_NEXT(mat)) {
2458                         if (SCTP_BUF_IS_EXTENDED(mat)) {
2459                                 sctp_log_mb(mat, SCTP_MBUF_SPLIT);
2460                         }
2461                 }
2462         }
2463 #endif
2464
2465         /*
2466          * compute the signature/digest for the cookie
2467          */
2468         ep = &(*inp_p)->sctp_ep;
2469         l_inp = *inp_p;
2470         if (l_stcb) {
2471                 SCTP_TCB_UNLOCK(l_stcb);
2472         }
2473         SCTP_INP_RLOCK(l_inp);
2474         if (l_stcb) {
2475                 SCTP_TCB_LOCK(l_stcb);
2476         }
2477         /* which cookie is it? */
2478         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2479             (ep->current_secret_number != ep->last_secret_number)) {
2480                 /* it's the old cookie */
2481                 (void)sctp_hmac_m(SCTP_HMAC,
2482                     (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2483                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2484         } else {
2485                 /* it's the current cookie */
2486                 (void)sctp_hmac_m(SCTP_HMAC,
2487                     (uint8_t *) ep->secret_key[(int)ep->current_secret_number],
2488                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2489         }
2490         /* get the signature */
2491         SCTP_INP_RUNLOCK(l_inp);
2492         sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig);
2493         if (sig == NULL) {
2494                 /* couldn't find signature */
2495                 sctp_m_freem(m_sig);
2496                 return (NULL);
2497         }
2498         /* compare the received digest with the computed digest */
2499         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2500                 /* try the old cookie? */
2501                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2502                     (ep->current_secret_number != ep->last_secret_number)) {
2503                         /* compute digest with old */
2504                         (void)sctp_hmac_m(SCTP_HMAC,
2505                             (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2506                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2507                         /* compare */
2508                         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2509                                 cookie_ok = 1;
2510                 }
2511         } else {
2512                 cookie_ok = 1;
2513         }
2514
2515         /*
2516          * Now before we continue we must reconstruct our mbuf so that
2517          * normal processing of any other chunks will work.
2518          */
2519         {
2520                 struct mbuf *m_at;
2521
2522                 m_at = m;
2523                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2524                         m_at = SCTP_BUF_NEXT(m_at);
2525                 }
2526                 SCTP_BUF_NEXT(m_at) = m_sig;
2527         }
2528
2529         if (cookie_ok == 0) {
2530                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2531                 SCTPDBG(SCTP_DEBUG_INPUT2,
2532                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2533                     (uint32_t) offset, cookie_offset, sig_offset);
2534                 return (NULL);
2535         }
2536         /*
2537          * check the cookie timestamps to be sure it's not stale
2538          */
2539         (void)SCTP_GETTIME_TIMEVAL(&now);
2540         /* Expire time is in Ticks, so we convert to seconds */
2541         time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
2542         time_expires.tv_usec = cookie->time_entered.tv_usec;
2543         /*
2544          * TODO sctp_constants.h needs alternative time macros when _KERNEL
2545          * is undefined.
2546          */
2547         if (timevalcmp(&now, &time_expires, >)) {
2548                 /* cookie is stale! */
2549                 struct mbuf *op_err;
2550                 struct sctp_stale_cookie_msg *scm;
2551                 uint32_t tim;
2552
2553                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg),
2554                     0, M_DONTWAIT, 1, MT_DATA);
2555                 if (op_err == NULL) {
2556                         /* FOOBAR */
2557                         return (NULL);
2558                 }
2559                 /* Set the len */
2560                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg);
2561                 scm = mtod(op_err, struct sctp_stale_cookie_msg *);
2562                 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE);
2563                 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) +
2564                     (sizeof(uint32_t))));
2565                 /* seconds to usec */
2566                 tim = (now.tv_sec - time_expires.tv_sec) * 1000000;
2567                 /* add in usec */
2568                 if (tim == 0)
2569                         tim = now.tv_usec - cookie->time_entered.tv_usec;
2570                 scm->time_usec = htonl(tim);
2571                 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag,
2572                     vrf_id, port);
2573                 return (NULL);
2574         }
2575         /*
2576          * Now we must see with the lookup address if we have an existing
2577          * asoc. This will only happen if we were in the COOKIE-WAIT state
2578          * and a INIT collided with us and somewhere the peer sent the
2579          * cookie on another address besides the single address our assoc
2580          * had for him. In this case we will have one of the tie-tags set at
2581          * least AND the address field in the cookie can be used to look it
2582          * up.
2583          */
2584         to = NULL;
2585         switch (cookie->addr_type) {
2586 #ifdef INET6
2587         case SCTP_IPV6_ADDRESS:
2588                 memset(&sin6, 0, sizeof(sin6));
2589                 sin6.sin6_family = AF_INET6;
2590                 sin6.sin6_len = sizeof(sin6);
2591                 sin6.sin6_port = sh->src_port;
2592                 sin6.sin6_scope_id = cookie->scope_id;
2593                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2594                     sizeof(sin6.sin6_addr.s6_addr));
2595                 to = (struct sockaddr *)&sin6;
2596                 break;
2597 #endif
2598 #ifdef INET
2599         case SCTP_IPV4_ADDRESS:
2600                 memset(&sin, 0, sizeof(sin));
2601                 sin.sin_family = AF_INET;
2602                 sin.sin_len = sizeof(sin);
2603                 sin.sin_port = sh->src_port;
2604                 sin.sin_addr.s_addr = cookie->address[0];
2605                 to = (struct sockaddr *)&sin;
2606                 break;
2607 #endif
2608         default:
2609                 /* This should not happen */
2610                 return (NULL);
2611         }
2612         if ((*stcb == NULL) && to) {
2613                 /* Yep, lets check */
2614                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, localep_sa, NULL);
2615                 if (*stcb == NULL) {
2616                         /*
2617                          * We should have only got back the same inp. If we
2618                          * got back a different ep we have a problem. The
2619                          * original findep got back l_inp and now
2620                          */
2621                         if (l_inp != *inp_p) {
2622                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2623                         }
2624                 } else {
2625                         if (*locked_tcb == NULL) {
2626                                 /*
2627                                  * In this case we found the assoc only
2628                                  * after we locked the create lock. This
2629                                  * means we are in a colliding case and we
2630                                  * must make sure that we unlock the tcb if
2631                                  * its one of the cases where we throw away
2632                                  * the incoming packets.
2633                                  */
2634                                 *locked_tcb = *stcb;
2635
2636                                 /*
2637                                  * We must also increment the inp ref count
2638                                  * since the ref_count flags was set when we
2639                                  * did not find the TCB, now we found it
2640                                  * which reduces the refcount.. we must
2641                                  * raise it back out to balance it all :-)
2642                                  */
2643                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2644                                 if ((*stcb)->sctp_ep != l_inp) {
2645                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2646                                             (*stcb)->sctp_ep, l_inp);
2647                                 }
2648                         }
2649                 }
2650         }
2651         if (to == NULL) {
2652                 return (NULL);
2653         }
2654         cookie_len -= SCTP_SIGNATURE_SIZE;
2655         if (*stcb == NULL) {
2656                 /* this is the "normal" case... get a new TCB */
2657                 *stcb = sctp_process_cookie_new(m, iphlen, offset, sh, cookie,
2658                     cookie_len, *inp_p, netp, to, &notification,
2659                     auth_skipped, auth_offset, auth_len, vrf_id, port);
2660         } else {
2661                 /* this is abnormal... cookie-echo on existing TCB */
2662                 had_a_existing_tcb = 1;
2663                 *stcb = sctp_process_cookie_existing(m, iphlen, offset, sh,
2664                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2665                     &notification, vrf_id, auth_skipped, auth_offset, auth_len, port);
2666         }
2667
2668         if (*stcb == NULL) {
2669                 /* still no TCB... must be bad cookie-echo */
2670                 return (NULL);
2671         }
2672         if ((*netp != NULL) && (m->m_flags & M_FLOWID)) {
2673                 (*netp)->flowid = m->m_pkthdr.flowid;
2674 #ifdef INVARIANTS
2675                 (*netp)->flowidset = 1;
2676 #endif
2677         }
2678         /*
2679          * Ok, we built an association so confirm the address we sent the
2680          * INIT-ACK to.
2681          */
2682         netl = sctp_findnet(*stcb, to);
2683         /*
2684          * This code should in theory NOT run but
2685          */
2686         if (netl == NULL) {
2687                 /* TSNH! Huh, why do I need to add this address here? */
2688                 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2689                         return (NULL);
2690                 }
2691                 netl = sctp_findnet(*stcb, to);
2692         }
2693         if (netl) {
2694                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2695                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2696                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2697                             netl);
2698                         send_int_conf = 1;
2699                 }
2700         }
2701         sctp_start_net_timers(*stcb);
2702         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2703                 if (!had_a_existing_tcb ||
2704                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2705                         /*
2706                          * If we have a NEW cookie or the connect never
2707                          * reached the connected state during collision we
2708                          * must do the TCP accept thing.
2709                          */
2710                         struct socket *so, *oso;
2711                         struct sctp_inpcb *inp;
2712
2713                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2714                                 /*
2715                                  * For a restart we will keep the same
2716                                  * socket, no need to do anything. I THINK!!
2717                                  */
2718                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2719                                 if (send_int_conf) {
2720                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2721                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2722                                 }
2723                                 return (m);
2724                         }
2725                         oso = (*inp_p)->sctp_socket;
2726                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2727                         SCTP_TCB_UNLOCK((*stcb));
2728                         CURVNET_SET(oso->so_vnet);
2729                         so = sonewconn(oso, 0
2730                             );
2731                         CURVNET_RESTORE();
2732                         SCTP_TCB_LOCK((*stcb));
2733                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2734
2735                         if (so == NULL) {
2736                                 struct mbuf *op_err;
2737
2738 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2739                                 struct socket *pcb_so;
2740
2741 #endif
2742                                 /* Too many sockets */
2743                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2744                                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2745                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2746                                     sh, op_err, vrf_id, port);
2747 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2748                                 pcb_so = SCTP_INP_SO(*inp_p);
2749                                 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2750                                 SCTP_TCB_UNLOCK((*stcb));
2751                                 SCTP_SOCKET_LOCK(pcb_so, 1);
2752                                 SCTP_TCB_LOCK((*stcb));
2753                                 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2754 #endif
2755                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2756 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2757                                 SCTP_SOCKET_UNLOCK(pcb_so, 1);
2758 #endif
2759                                 return (NULL);
2760                         }
2761                         inp = (struct sctp_inpcb *)so->so_pcb;
2762                         SCTP_INP_INCR_REF(inp);
2763                         /*
2764                          * We add the unbound flag here so that if we get an
2765                          * soabort() before we get the move_pcb done, we
2766                          * will properly cleanup.
2767                          */
2768                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2769                             SCTP_PCB_FLAGS_CONNECTED |
2770                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2771                             SCTP_PCB_FLAGS_UNBOUND |
2772                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2773                             SCTP_PCB_FLAGS_DONT_WAKE);
2774                         inp->sctp_features = (*inp_p)->sctp_features;
2775                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2776                         inp->sctp_socket = so;
2777                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2778                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2779                         inp->sctp_ecn_enable = (*inp_p)->sctp_ecn_enable;
2780                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2781                         inp->sctp_context = (*inp_p)->sctp_context;
2782                         inp->local_strreset_support = (*inp_p)->local_strreset_support;
2783                         inp->inp_starting_point_for_iterator = NULL;
2784                         /*
2785                          * copy in the authentication parameters from the
2786                          * original endpoint
2787                          */
2788                         if (inp->sctp_ep.local_hmacs)
2789                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2790                         inp->sctp_ep.local_hmacs =
2791                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2792                         if (inp->sctp_ep.local_auth_chunks)
2793                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2794                         inp->sctp_ep.local_auth_chunks =
2795                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2796
2797                         /*
2798                          * Now we must move it from one hash table to
2799                          * another and get the tcb in the right place.
2800                          */
2801
2802                         /*
2803                          * This is where the one-2-one socket is put into
2804                          * the accept state waiting for the accept!
2805                          */
2806                         if (*stcb) {
2807                                 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE;
2808                         }
2809                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2810
2811                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2812                         SCTP_TCB_UNLOCK((*stcb));
2813
2814                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2815                             0);
2816                         SCTP_TCB_LOCK((*stcb));
2817                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2818
2819
2820                         /*
2821                          * now we must check to see if we were aborted while
2822                          * the move was going on and the lock/unlock
2823                          * happened.
2824                          */
2825                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2826                                 /*
2827                                  * yep it was, we leave the assoc attached
2828                                  * to the socket since the sctp_inpcb_free()
2829                                  * call will send an abort for us.
2830                                  */
2831                                 SCTP_INP_DECR_REF(inp);
2832                                 return (NULL);
2833                         }
2834                         SCTP_INP_DECR_REF(inp);
2835                         /* Switch over to the new guy */
2836                         *inp_p = inp;
2837                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2838                         if (send_int_conf) {
2839                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2840                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2841                         }
2842                         /*
2843                          * Pull it from the incomplete queue and wake the
2844                          * guy
2845                          */
2846 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2847                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2848                         SCTP_TCB_UNLOCK((*stcb));
2849                         SCTP_SOCKET_LOCK(so, 1);
2850 #endif
2851                         soisconnected(so);
2852 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2853                         SCTP_TCB_LOCK((*stcb));
2854                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2855                         SCTP_SOCKET_UNLOCK(so, 1);
2856 #endif
2857                         return (m);
2858                 }
2859         }
2860         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) {
2861                 if (notification) {
2862                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2863                 }
2864                 if (send_int_conf) {
2865                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2866                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2867                 }
2868         }
2869         return (m);
2870 }
2871
2872 static void
2873 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2874     struct sctp_tcb *stcb, struct sctp_nets *net)
2875 {
2876         /* cp must not be used, others call this without a c-ack :-) */
2877         struct sctp_association *asoc;
2878
2879         SCTPDBG(SCTP_DEBUG_INPUT2,
2880             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2881         if (stcb == NULL)
2882                 return;
2883
2884         asoc = &stcb->asoc;
2885
2886         sctp_stop_all_cookie_timers(stcb);
2887         /* process according to association state */
2888         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
2889                 /* state change only needed when I am in right state */
2890                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2891                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2892                 sctp_start_net_timers(stcb);
2893                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2894                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2895                             stcb->sctp_ep, stcb, asoc->primary_destination);
2896
2897                 }
2898                 /* update RTO */
2899                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2900                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2901                 if (asoc->overall_error_count == 0) {
2902                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
2903                             &asoc->time_entered, sctp_align_safe_nocopy,
2904                             SCTP_RTT_FROM_NON_DATA);
2905                 }
2906                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2907                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2908                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2909                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2910 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2911                         struct socket *so;
2912
2913 #endif
2914                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2915 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2916                         so = SCTP_INP_SO(stcb->sctp_ep);
2917                         atomic_add_int(&stcb->asoc.refcnt, 1);
2918                         SCTP_TCB_UNLOCK(stcb);
2919                         SCTP_SOCKET_LOCK(so, 1);
2920                         SCTP_TCB_LOCK(stcb);
2921                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2922 #endif
2923                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
2924                                 soisconnected(stcb->sctp_socket);
2925                         }
2926 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2927                         SCTP_SOCKET_UNLOCK(so, 1);
2928 #endif
2929                 }
2930                 /*
2931                  * since we did not send a HB make sure we don't double
2932                  * things
2933                  */
2934                 net->hb_responded = 1;
2935
2936                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2937                         /*
2938                          * We don't need to do the asconf thing, nor hb or
2939                          * autoclose if the socket is closed.
2940                          */
2941                         goto closed_socket;
2942                 }
2943                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2944                     stcb, net);
2945
2946
2947                 if (stcb->asoc.sctp_autoclose_ticks &&
2948                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2949                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2950                             stcb->sctp_ep, stcb, NULL);
2951                 }
2952                 /*
2953                  * send ASCONF if parameters are pending and ASCONFs are
2954                  * allowed (eg. addresses changed when init/cookie echo were
2955                  * in flight)
2956                  */
2957                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2958                     (stcb->asoc.peer_supports_asconf) &&
2959                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2960 #ifdef SCTP_TIMER_BASED_ASCONF
2961                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2962                             stcb->sctp_ep, stcb,
2963                             stcb->asoc.primary_destination);
2964 #else
2965                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2966                             SCTP_ADDR_NOT_LOCKED);
2967 #endif
2968                 }
2969         }
2970 closed_socket:
2971         /* Toss the cookie if I can */
2972         sctp_toss_old_cookies(stcb, asoc);
2973         if (!TAILQ_EMPTY(&asoc->sent_queue)) {
2974                 /* Restart the timer if we have pending data */
2975                 struct sctp_tmit_chunk *chk;
2976
2977                 chk = TAILQ_FIRST(&asoc->sent_queue);
2978                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
2979         }
2980 }
2981
2982 static void
2983 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
2984     struct sctp_tcb *stcb)
2985 {
2986         struct sctp_nets *net;
2987         struct sctp_tmit_chunk *lchk;
2988         struct sctp_ecne_chunk bkup;
2989         uint8_t override_bit;
2990         uint32_t tsn, window_data_tsn;
2991         int len;
2992         unsigned int pkt_cnt;
2993
2994         len = ntohs(cp->ch.chunk_length);
2995         if ((len != sizeof(struct sctp_ecne_chunk)) &&
2996             (len != sizeof(struct old_sctp_ecne_chunk))) {
2997                 return;
2998         }
2999         if (len == sizeof(struct old_sctp_ecne_chunk)) {
3000                 /* Its the old format */
3001                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
3002                 bkup.num_pkts_since_cwr = htonl(1);
3003                 cp = &bkup;
3004         }
3005         SCTP_STAT_INCR(sctps_recvecne);
3006         tsn = ntohl(cp->tsn);
3007         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
3008         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
3009         if (lchk == NULL) {
3010                 window_data_tsn = stcb->asoc.sending_seq - 1;
3011         } else {
3012                 window_data_tsn = lchk->rec.data.TSN_seq;
3013         }
3014
3015         /* Find where it was sent to if possible. */
3016         net = NULL;
3017         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
3018                 if (lchk->rec.data.TSN_seq == tsn) {
3019                         net = lchk->whoTo;
3020                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
3021                         break;
3022                 }
3023                 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) {
3024                         break;
3025                 }
3026         }
3027         if (net == NULL) {
3028                 /*
3029                  * What to do. A previous send of a CWR was possibly lost.
3030                  * See how old it is, we may have it marked on the actual
3031                  * net.
3032                  */
3033                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
3034                         if (tsn == net->last_cwr_tsn) {
3035                                 /* Found him, send it off */
3036                                 break;
3037                         }
3038                 }
3039                 if (net == NULL) {
3040                         /*
3041                          * If we reach here, we need to send a special CWR
3042                          * that says hey, we did this a long time ago and
3043                          * you lost the response.
3044                          */
3045                         net = TAILQ_FIRST(&stcb->asoc.nets);
3046                         if (net == NULL) {
3047                                 /* TSNH */
3048                                 return;
3049                         }
3050                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
3051                 } else {
3052                         override_bit = 0;
3053                 }
3054         } else {
3055                 override_bit = 0;
3056         }
3057         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
3058             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3059                 /*
3060                  * JRS - Use the congestion control given in the pluggable
3061                  * CC module
3062                  */
3063                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
3064                 /*
3065                  * We reduce once every RTT. So we will only lower cwnd at
3066                  * the next sending seq i.e. the window_data_tsn
3067                  */
3068                 net->cwr_window_tsn = window_data_tsn;
3069                 net->ecn_ce_pkt_cnt += pkt_cnt;
3070                 net->lost_cnt = pkt_cnt;
3071                 net->last_cwr_tsn = tsn;
3072         } else {
3073                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
3074                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
3075                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3076                         /*
3077                          * Another loss in the same window update how many
3078                          * marks/packets lost we have had.
3079                          */
3080                         int cnt = 1;
3081
3082                         if (pkt_cnt > net->lost_cnt) {
3083                                 /* Should be the case */
3084                                 cnt = (pkt_cnt - net->lost_cnt);
3085                                 net->ecn_ce_pkt_cnt += cnt;
3086                         }
3087                         net->lost_cnt = pkt_cnt;
3088                         net->last_cwr_tsn = tsn;
3089                         /*
3090                          * Most CC functions will ignore this call, since we
3091                          * are in-window yet of the initial CE the peer saw.
3092                          */
3093                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
3094                 }
3095         }
3096         /*
3097          * We always send a CWR this way if our previous one was lost our
3098          * peer will get an update, or if it is not time again to reduce we
3099          * still get the cwr to the peer. Note we set the override when we
3100          * could not find the TSN on the chunk or the destination network.
3101          */
3102         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
3103 }
3104
3105 static void
3106 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3107 {
3108         /*
3109          * Here we get a CWR from the peer. We must look in the outqueue and
3110          * make sure that we have a covered ECNE in teh control chunk part.
3111          * If so remove it.
3112          */
3113         struct sctp_tmit_chunk *chk;
3114         struct sctp_ecne_chunk *ecne;
3115         int override;
3116         uint32_t cwr_tsn;
3117
3118         cwr_tsn = ntohl(cp->tsn);
3119
3120         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3121         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
3122                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3123                         continue;
3124                 }
3125                 if ((override == 0) && (chk->whoTo != net)) {
3126                         /* Must be from the right src unless override is set */
3127                         continue;
3128                 }
3129                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3130                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3131                         /* this covers this ECNE, we can remove it */
3132                         stcb->asoc.ecn_echo_cnt_onq--;
3133                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3134                             sctp_next);
3135                         if (chk->data) {
3136                                 sctp_m_freem(chk->data);
3137                                 chk->data = NULL;
3138                         }
3139                         stcb->asoc.ctrl_queue_cnt--;
3140                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3141                         if (override == 0) {
3142                                 break;
3143                         }
3144                 }
3145         }
3146 }
3147
3148 static void
3149 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3150     struct sctp_tcb *stcb, struct sctp_nets *net)
3151 {
3152         struct sctp_association *asoc;
3153
3154 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3155         struct socket *so;
3156
3157 #endif
3158
3159         SCTPDBG(SCTP_DEBUG_INPUT2,
3160             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3161         if (stcb == NULL)
3162                 return;
3163
3164         asoc = &stcb->asoc;
3165         /* process according to association state */
3166         if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3167                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3168                 SCTPDBG(SCTP_DEBUG_INPUT2,
3169                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3170                 SCTP_TCB_UNLOCK(stcb);
3171                 return;
3172         }
3173         /* notify upper layer protocol */
3174         if (stcb->sctp_socket) {
3175                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3176                 /* are the queues empty? they should be */
3177                 if (!TAILQ_EMPTY(&asoc->send_queue) ||
3178                     !TAILQ_EMPTY(&asoc->sent_queue) ||
3179                     !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
3180                         sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED);
3181                 }
3182         }
3183         /* stop the timer */
3184         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
3185         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3186         /* free the TCB */
3187         SCTPDBG(SCTP_DEBUG_INPUT2,
3188             "sctp_handle_shutdown_complete: calls free-asoc\n");
3189 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3190         so = SCTP_INP_SO(stcb->sctp_ep);
3191         atomic_add_int(&stcb->asoc.refcnt, 1);
3192         SCTP_TCB_UNLOCK(stcb);
3193         SCTP_SOCKET_LOCK(so, 1);
3194         SCTP_TCB_LOCK(stcb);
3195         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3196 #endif
3197         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
3198 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3199         SCTP_SOCKET_UNLOCK(so, 1);
3200 #endif
3201         return;
3202 }
3203
3204 static int
3205 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3206     struct sctp_nets *net, uint8_t flg)
3207 {
3208         switch (desc->chunk_type) {
3209         case SCTP_DATA:
3210                 /* find the tsn to resend (possibly */
3211                 {
3212                         uint32_t tsn;
3213                         struct sctp_tmit_chunk *tp1;
3214
3215                         tsn = ntohl(desc->tsn_ifany);
3216                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3217                                 if (tp1->rec.data.TSN_seq == tsn) {
3218                                         /* found it */
3219                                         break;
3220                                 }
3221                                 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) {
3222                                         /* not found */
3223                                         tp1 = NULL;
3224                                         break;
3225                                 }
3226                         }
3227                         if (tp1 == NULL) {
3228                                 /*
3229                                  * Do it the other way , aka without paying
3230                                  * attention to queue seq order.
3231                                  */
3232                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3233                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3234                                         if (tp1->rec.data.TSN_seq == tsn) {
3235                                                 /* found it */
3236                                                 break;
3237                                         }
3238                                 }
3239                         }
3240                         if (tp1 == NULL) {
3241                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3242                         }
3243                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3244                                 uint8_t *ddp;
3245
3246                                 if (((flg & SCTP_BADCRC) == 0) &&
3247                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3248                                         return (0);
3249                                 }
3250                                 if ((stcb->asoc.peers_rwnd == 0) &&
3251                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3252                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3253                                         return (0);
3254                                 }
3255                                 if (stcb->asoc.peers_rwnd == 0 &&
3256                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3257                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3258                                         return (0);
3259                                 }
3260                                 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+
3261                                     sizeof(struct sctp_data_chunk));
3262                                 {
3263                                         unsigned int iii;
3264
3265                                         for (iii = 0; iii < sizeof(desc->data_bytes);
3266                                             iii++) {
3267                                                 if (ddp[iii] != desc->data_bytes[iii]) {
3268                                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3269                                                         return (-1);
3270                                                 }
3271                                         }
3272                                 }
3273
3274                                 if (tp1->do_rtt) {
3275                                         /*
3276                                          * this guy had a RTO calculation
3277                                          * pending on it, cancel it
3278                                          */
3279                                         if (tp1->whoTo->rto_needed == 0) {
3280                                                 tp1->whoTo->rto_needed = 1;
3281                                         }
3282                                         tp1->do_rtt = 0;
3283                                 }
3284                                 SCTP_STAT_INCR(sctps_pdrpmark);
3285                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3286                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3287                                 /*
3288                                  * mark it as if we were doing a FR, since
3289                                  * we will be getting gap ack reports behind
3290                                  * the info from the router.
3291                                  */
3292                                 tp1->rec.data.doing_fast_retransmit = 1;
3293                                 /*
3294                                  * mark the tsn with what sequences can
3295                                  * cause a new FR.
3296                                  */
3297                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3298                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3299                                 } else {
3300                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
3301                                 }
3302
3303                                 /* restart the timer */
3304                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3305                                     stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3306                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3307                                     stcb, tp1->whoTo);
3308
3309                                 /* fix counts and things */
3310                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3311                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3312                                             tp1->whoTo->flight_size,
3313                                             tp1->book_size,
3314                                             (uintptr_t) stcb,
3315                                             tp1->rec.data.TSN_seq);
3316                                 }
3317                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3318                                         sctp_flight_size_decrease(tp1);
3319                                         sctp_total_flight_decrease(stcb, tp1);
3320                                 }
3321                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3322                         } {
3323                                 /* audit code */
3324                                 unsigned int audit;
3325
3326                                 audit = 0;
3327                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3328                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3329                                                 audit++;
3330                                 }
3331                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3332                                     sctp_next) {
3333                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3334                                                 audit++;
3335                                 }
3336                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3337                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3338                                             audit, stcb->asoc.sent_queue_retran_cnt);
3339 #ifndef SCTP_AUDITING_ENABLED
3340                                         stcb->asoc.sent_queue_retran_cnt = audit;
3341 #endif
3342                                 }
3343                         }
3344                 }
3345                 break;
3346         case SCTP_ASCONF:
3347                 {
3348                         struct sctp_tmit_chunk *asconf;
3349
3350                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3351                             sctp_next) {
3352                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3353                                         break;
3354                                 }
3355                         }
3356                         if (asconf) {
3357                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3358                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3359                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3360                                 asconf->snd_count--;
3361                         }
3362                 }
3363                 break;
3364         case SCTP_INITIATION:
3365                 /* resend the INIT */
3366                 stcb->asoc.dropped_special_cnt++;
3367                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3368                         /*
3369                          * If we can get it in, in a few attempts we do
3370                          * this, otherwise we let the timer fire.
3371                          */
3372                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3373                             stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3374                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3375                 }
3376                 break;
3377         case SCTP_SELECTIVE_ACK:
3378         case SCTP_NR_SELECTIVE_ACK:
3379                 /* resend the sack */
3380                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3381                 break;
3382         case SCTP_HEARTBEAT_REQUEST:
3383                 /* resend a demand HB */
3384                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3385                         /*
3386                          * Only retransmit if we KNOW we wont destroy the
3387                          * tcb
3388                          */
3389                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3390                 }
3391                 break;
3392         case SCTP_SHUTDOWN:
3393                 sctp_send_shutdown(stcb, net);
3394                 break;
3395         case SCTP_SHUTDOWN_ACK:
3396                 sctp_send_shutdown_ack(stcb, net);
3397                 break;
3398         case SCTP_COOKIE_ECHO:
3399                 {
3400                         struct sctp_tmit_chunk *cookie;
3401
3402                         cookie = NULL;
3403                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3404                             sctp_next) {
3405                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3406                                         break;
3407                                 }
3408                         }
3409                         if (cookie) {
3410                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3411                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3412                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3413                                 sctp_stop_all_cookie_timers(stcb);
3414                         }
3415                 }
3416                 break;
3417         case SCTP_COOKIE_ACK:
3418                 sctp_send_cookie_ack(stcb);
3419                 break;
3420         case SCTP_ASCONF_ACK:
3421                 /* resend last asconf ack */
3422                 sctp_send_asconf_ack(stcb);
3423                 break;
3424         case SCTP_FORWARD_CUM_TSN:
3425                 send_forward_tsn(stcb, &stcb->asoc);
3426                 break;
3427                 /* can't do anything with these */
3428         case SCTP_PACKET_DROPPED:
3429         case SCTP_INITIATION_ACK:       /* this should not happen */
3430         case SCTP_HEARTBEAT_ACK:
3431         case SCTP_ABORT_ASSOCIATION:
3432         case SCTP_OPERATION_ERROR:
3433         case SCTP_SHUTDOWN_COMPLETE:
3434         case SCTP_ECN_ECHO:
3435         case SCTP_ECN_CWR:
3436         default:
3437                 break;
3438         }
3439         return (0);
3440 }
3441
3442 void
3443 sctp_reset_in_stream(struct sctp_tcb *stcb, int number_entries, uint16_t * list)
3444 {
3445         int i;
3446         uint16_t temp;
3447
3448         /*
3449          * We set things to 0xffff since this is the last delivered sequence
3450          * and we will be sending in 0 after the reset.
3451          */
3452
3453         if (number_entries) {
3454                 for (i = 0; i < number_entries; i++) {
3455                         temp = ntohs(list[i]);
3456                         if (temp >= stcb->asoc.streamincnt) {
3457                                 continue;
3458                         }
3459                         stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff;
3460                 }
3461         } else {
3462                 list = NULL;
3463                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3464                         stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3465                 }
3466         }
3467         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3468 }
3469
3470 static void
3471 sctp_reset_out_streams(struct sctp_tcb *stcb, int number_entries, uint16_t * list)
3472 {
3473         int i;
3474
3475         if (number_entries == 0) {
3476                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3477                         stcb->asoc.strmout[i].next_sequence_sent = 0;
3478                 }
3479         } else if (number_entries) {
3480                 for (i = 0; i < number_entries; i++) {
3481                         uint16_t temp;
3482
3483                         temp = ntohs(list[i]);
3484                         if (temp >= stcb->asoc.streamoutcnt) {
3485                                 /* no such stream */
3486                                 continue;
3487                         }
3488                         stcb->asoc.strmout[temp].next_sequence_sent = 0;
3489                 }
3490         }
3491         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3492 }
3493
3494
3495 struct sctp_stream_reset_out_request *
3496 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3497 {
3498         struct sctp_association *asoc;
3499         struct sctp_stream_reset_out_req *req;
3500         struct sctp_stream_reset_out_request *r;
3501         struct sctp_tmit_chunk *chk;
3502         int len, clen;
3503
3504         asoc = &stcb->asoc;
3505         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3506                 asoc->stream_reset_outstanding = 0;
3507                 return (NULL);
3508         }
3509         if (stcb->asoc.str_reset == NULL) {
3510                 asoc->stream_reset_outstanding = 0;
3511                 return (NULL);
3512         }
3513         chk = stcb->asoc.str_reset;
3514         if (chk->data == NULL) {
3515                 return (NULL);
3516         }
3517         if (bchk) {
3518                 /* he wants a copy of the chk pointer */
3519                 *bchk = chk;
3520         }
3521         clen = chk->send_size;
3522         req = mtod(chk->data, struct sctp_stream_reset_out_req *);
3523         r = &req->sr_req;
3524         if (ntohl(r->request_seq) == seq) {
3525                 /* found it */
3526                 return (r);
3527         }
3528         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3529         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3530                 /* move to the next one, there can only be a max of two */
3531                 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len);
3532                 if (ntohl(r->request_seq) == seq) {
3533                         return (r);
3534                 }
3535         }
3536         /* that seq is not here */
3537         return (NULL);
3538 }
3539
3540 static void
3541 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3542 {
3543         struct sctp_association *asoc;
3544         struct sctp_tmit_chunk *chk = stcb->asoc.str_reset;
3545
3546         if (stcb->asoc.str_reset == NULL) {
3547                 return;
3548         }
3549         asoc = &stcb->asoc;
3550
3551         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3552         TAILQ_REMOVE(&asoc->control_send_queue,
3553             chk,
3554             sctp_next);
3555         if (chk->data) {
3556                 sctp_m_freem(chk->data);
3557                 chk->data = NULL;
3558         }
3559         asoc->ctrl_queue_cnt--;
3560         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3561         /* sa_ignore NO_NULL_CHK */
3562         stcb->asoc.str_reset = NULL;
3563 }
3564
3565
3566 static int
3567 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3568     uint32_t seq, uint32_t action,
3569     struct sctp_stream_reset_response *respin)
3570 {
3571         uint16_t type;
3572         int lparm_len;
3573         struct sctp_association *asoc = &stcb->asoc;
3574         struct sctp_tmit_chunk *chk;
3575         struct sctp_stream_reset_out_request *srparam;
3576         int number_entries;
3577
3578         if (asoc->stream_reset_outstanding == 0) {
3579                 /* duplicate */
3580                 return (0);
3581         }
3582         if (seq == stcb->asoc.str_reset_seq_out) {
3583                 srparam = sctp_find_stream_reset(stcb, seq, &chk);
3584                 if (srparam) {
3585                         stcb->asoc.str_reset_seq_out++;
3586                         type = ntohs(srparam->ph.param_type);
3587                         lparm_len = ntohs(srparam->ph.param_length);
3588                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3589                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3590                                 asoc->stream_reset_out_is_outstanding = 0;
3591                                 if (asoc->stream_reset_outstanding)
3592                                         asoc->stream_reset_outstanding--;
3593                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3594                                         /* do it */
3595                                         sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams);
3596                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3597                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3598                                 } else {
3599                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3600                                 }
3601                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3602                                 /* Answered my request */
3603                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3604                                 if (asoc->stream_reset_outstanding)
3605                                         asoc->stream_reset_outstanding--;
3606                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3607                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3608                                             number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3609                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3610                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3611                                             number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3612                                 }
3613                         } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3614                                 /* Ok we now may have more streams */
3615                                 int num_stream;
3616
3617                                 num_stream = stcb->asoc.strm_pending_add_size;
3618                                 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3619                                         /* TSNH */
3620                                         num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3621                                 }
3622                                 stcb->asoc.strm_pending_add_size = 0;
3623                                 if (asoc->stream_reset_outstanding)
3624                                         asoc->stream_reset_outstanding--;
3625                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3626                                         /* Put the new streams into effect */
3627                                         stcb->asoc.streamoutcnt += num_stream;
3628                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3629                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3630                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3631                                             SCTP_STREAM_CHANGE_DENIED);
3632                                 } else {
3633                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3634                                             SCTP_STREAM_CHANGE_FAILED);
3635                                 }
3636                         } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3637                                 if (asoc->stream_reset_outstanding)
3638                                         asoc->stream_reset_outstanding--;
3639                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3640                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3641                                             SCTP_STREAM_CHANGE_DENIED);
3642                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3643                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3644                                             SCTP_STREAM_CHANGE_FAILED);
3645                                 }
3646                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3647                                 /**
3648                                  * a) Adopt the new in tsn.
3649                                  * b) reset the map
3650                                  * c) Adopt the new out-tsn
3651                                  */
3652                                 struct sctp_stream_reset_response_tsn *resp;
3653                                 struct sctp_forward_tsn_chunk fwdtsn;
3654                                 int abort_flag = 0;
3655
3656                                 if (respin == NULL) {
3657                                         /* huh ? */
3658                                         return (0);
3659                                 }
3660                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3661                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3662                                         asoc->stream_reset_outstanding--;
3663                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3664                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3665                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3666                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3667                                         if (abort_flag) {
3668                                                 return (1);
3669                                         }
3670                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3671                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3672                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3673                                         }
3674                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3675                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3676                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3677
3678                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3679                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3680
3681                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3682                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3683
3684                                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3685                                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3686                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3687                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3688                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3689                                             SCTP_ASSOC_RESET_DENIED);
3690                                 } else {
3691                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3692                                             SCTP_ASSOC_RESET_FAILED);
3693                                 }
3694                         }
3695                         /* get rid of the request and get the request flags */
3696                         if (asoc->stream_reset_outstanding == 0) {
3697                                 sctp_clean_up_stream_reset(stcb);
3698                         }
3699                 }
3700         }
3701         return (0);
3702 }
3703
3704 static void
3705 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3706     struct sctp_tmit_chunk *chk,
3707     struct sctp_stream_reset_in_request *req, int trunc)
3708 {
3709         uint32_t seq;
3710         int len, i;
3711         int number_entries;
3712         uint16_t temp;
3713
3714         /*
3715          * peer wants me to send a str-reset to him for my outgoing seq's if
3716          * seq_in is right.
3717          */
3718         struct sctp_association *asoc = &stcb->asoc;
3719
3720         seq = ntohl(req->request_seq);
3721         if (asoc->str_reset_seq_in == seq) {
3722                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3723                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3724                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3725                 } else if (trunc) {
3726                         /* Can't do it, since they exceeded our buffer size  */
3727                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3728                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3729                         len = ntohs(req->ph.param_length);
3730                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3731                         for (i = 0; i < number_entries; i++) {
3732                                 temp = ntohs(req->list_of_streams[i]);
3733                                 req->list_of_streams[i] = temp;
3734                         }
3735                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3736                         sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams,
3737                             asoc->str_reset_seq_out,
3738                             seq, (asoc->sending_seq - 1));
3739                         asoc->stream_reset_out_is_outstanding = 1;
3740                         asoc->str_reset = chk;
3741                         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
3742                         stcb->asoc.stream_reset_outstanding++;
3743                 } else {
3744                         /* Can't do it, since we have sent one out */
3745                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3746                 }
3747                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3748                 asoc->str_reset_seq_in++;
3749         } else if (asoc->str_reset_seq_in - 1 == seq) {
3750                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3751         } else if (asoc->str_reset_seq_in - 2 == seq) {
3752                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3753         } else {
3754                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3755         }
3756 }
3757
3758 static int
3759 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3760     struct sctp_tmit_chunk *chk,
3761     struct sctp_stream_reset_tsn_request *req)
3762 {
3763         /* reset all in and out and update the tsn */
3764         /*
3765          * A) reset my str-seq's on in and out. B) Select a receive next,
3766          * and set cum-ack to it. Also process this selected number as a
3767          * fwd-tsn as well. C) set in the response my next sending seq.
3768          */
3769         struct sctp_forward_tsn_chunk fwdtsn;
3770         struct sctp_association *asoc = &stcb->asoc;
3771         int abort_flag = 0;
3772         uint32_t seq;
3773
3774         seq = ntohl(req->request_seq);
3775         if (asoc->str_reset_seq_in == seq) {
3776                 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3777                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3778                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3779                 } else {
3780                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3781                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3782                         fwdtsn.ch.chunk_flags = 0;
3783                         fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3784                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3785                         if (abort_flag) {
3786                                 return (1);
3787                         }
3788                         asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3789                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3790                                 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3791                         }
3792                         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3793                         asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3794                         memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3795                         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3796                         memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3797                         atomic_add_int(&asoc->sending_seq, 1);
3798                         /* save off historical data for retrans */
3799                         asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3800                         asoc->last_sending_seq[0] = asoc->sending_seq;
3801                         asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3802                         asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3803                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3804                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3805                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3806                         sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3807                 }
3808                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3809                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3810                 asoc->str_reset_seq_in++;
3811         } else if (asoc->str_reset_seq_in - 1 == seq) {
3812                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3813                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3814         } else if (asoc->str_reset_seq_in - 2 == seq) {
3815                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3816                     asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3817         } else {
3818                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3819         }
3820         return (0);
3821 }
3822
3823 static void
3824 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3825     struct sctp_tmit_chunk *chk,
3826     struct sctp_stream_reset_out_request *req, int trunc)
3827 {
3828         uint32_t seq, tsn;
3829         int number_entries, len;
3830         struct sctp_association *asoc = &stcb->asoc;
3831
3832         seq = ntohl(req->request_seq);
3833
3834         /* now if its not a duplicate we process it */
3835         if (asoc->str_reset_seq_in == seq) {
3836                 len = ntohs(req->ph.param_length);
3837                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3838                 /*
3839                  * the sender is resetting, handle the list issue.. we must
3840                  * a) verify if we can do the reset, if so no problem b) If
3841                  * we can't do the reset we must copy the request. c) queue
3842                  * it, and setup the data in processor to trigger it off
3843                  * when needed and dequeue all the queued data.
3844                  */
3845                 tsn = ntohl(req->send_reset_at_tsn);
3846
3847                 /* move the reset action back one */
3848                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3849                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3850                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3851                 } else if (trunc) {
3852                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3853                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3854                         /* we can do it now */
3855                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3856                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3857                 } else {
3858                         /*
3859                          * we must queue it up and thus wait for the TSN's
3860                          * to arrive that are at or before tsn
3861                          */
3862                         struct sctp_stream_reset_list *liste;
3863                         int siz;
3864
3865                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3866                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3867                             siz, SCTP_M_STRESET);
3868                         if (liste == NULL) {
3869                                 /* gak out of memory */
3870                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3871                                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3872                                 return;
3873                         }
3874                         liste->tsn = tsn;
3875                         liste->number_entries = number_entries;
3876                         memcpy(&liste->req, req,
3877                             (sizeof(struct sctp_stream_reset_out_request) + (number_entries * sizeof(uint16_t))));
3878                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3879                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3880                 }
3881                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3882                 asoc->str_reset_seq_in++;
3883         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3884                 /*
3885                  * one seq back, just echo back last action since my
3886                  * response was lost.
3887                  */
3888                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3889         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3890                 /*
3891                  * two seq back, just echo back last action since my
3892                  * response was lost.
3893                  */
3894                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3895         } else {
3896                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3897         }
3898 }
3899
3900 static void
3901 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3902     struct sctp_stream_reset_add_strm *str_add)
3903 {
3904         /*
3905          * Peer is requesting to add more streams. If its within our
3906          * max-streams we will allow it.
3907          */
3908         uint32_t num_stream, i;
3909         uint32_t seq;
3910         struct sctp_association *asoc = &stcb->asoc;
3911         struct sctp_queued_to_read *ctl, *nctl;
3912
3913         /* Get the number. */
3914         seq = ntohl(str_add->request_seq);
3915         num_stream = ntohs(str_add->number_of_streams);
3916         /* Now what would be the new total? */
3917         if (asoc->str_reset_seq_in == seq) {
3918                 num_stream += stcb->asoc.streamincnt;
3919                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3920                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3921                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3922                 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
3923                     (num_stream > 0xffff)) {
3924                         /* We must reject it they ask for to many */
3925         denied:
3926                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3927                 } else {
3928                         /* Ok, we can do that :-) */
3929                         struct sctp_stream_in *oldstrm;
3930
3931                         /* save off the old */
3932                         oldstrm = stcb->asoc.strmin;
3933                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
3934                             (num_stream * sizeof(struct sctp_stream_in)),
3935                             SCTP_M_STRMI);
3936                         if (stcb->asoc.strmin == NULL) {
3937                                 stcb->asoc.strmin = oldstrm;
3938                                 goto denied;
3939                         }
3940                         /* copy off the old data */
3941                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
3942                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3943                                 stcb->asoc.strmin[i].stream_no = i;
3944                                 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered;
3945                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
3946                                 /* now anything on those queues? */
3947                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) {
3948                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next);
3949                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next);
3950                                 }
3951                         }
3952                         /* Init the new streams */
3953                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
3954                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3955                                 stcb->asoc.strmin[i].stream_no = i;
3956                                 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3957                                 stcb->asoc.strmin[i].delivery_started = 0;
3958                         }
3959                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
3960                         /* update the size */
3961                         stcb->asoc.streamincnt = num_stream;
3962                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3963                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3964                 }
3965                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3966                 asoc->str_reset_seq_in++;
3967         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3968                 /*
3969                  * one seq back, just echo back last action since my
3970                  * response was lost.
3971                  */
3972                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3973         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3974                 /*
3975                  * two seq back, just echo back last action since my
3976                  * response was lost.
3977                  */
3978                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3979         } else {
3980                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3981
3982         }
3983 }
3984
3985 static void
3986 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3987     struct sctp_stream_reset_add_strm *str_add)
3988 {
3989         /*
3990          * Peer is requesting to add more streams. If its within our
3991          * max-streams we will allow it.
3992          */
3993         uint16_t num_stream;
3994         uint32_t seq;
3995         struct sctp_association *asoc = &stcb->asoc;
3996
3997         /* Get the number. */
3998         seq = ntohl(str_add->request_seq);
3999         num_stream = ntohs(str_add->number_of_streams);
4000         /* Now what would be the new total? */
4001         if (asoc->str_reset_seq_in == seq) {
4002                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4003                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4004                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4005                 } else if (stcb->asoc.stream_reset_outstanding) {
4006                         /* We must reject it we have something pending */
4007                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
4008                 } else {
4009                         /* Ok, we can do that :-) */
4010                         int mychk;
4011
4012                         mychk = stcb->asoc.streamoutcnt;
4013                         mychk += num_stream;
4014                         if (mychk < 0x10000) {
4015                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4016                                 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 0, 1, num_stream, 0, 1)) {
4017                                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4018                                 }
4019                         } else {
4020                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4021                         }
4022                 }
4023                 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
4024                 asoc->str_reset_seq_in++;
4025         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4026                 /*
4027                  * one seq back, just echo back last action since my
4028                  * response was lost.
4029                  */
4030                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4031         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4032                 /*
4033                  * two seq back, just echo back last action since my
4034                  * response was lost.
4035                  */
4036                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4037         } else {
4038                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4039         }
4040 }
4041
4042 #ifdef __GNUC__
4043 __attribute__((noinline))
4044 #endif
4045         static int
4046             sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
4047         struct sctp_stream_reset_out_req *sr_req)
4048 {
4049         int chk_length, param_len, ptype;
4050         struct sctp_paramhdr pstore;
4051         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
4052         uint32_t seq = 0;
4053         int num_req = 0;
4054         int trunc = 0;
4055         struct sctp_tmit_chunk *chk;
4056         struct sctp_chunkhdr *ch;
4057         struct sctp_paramhdr *ph;
4058         int ret_code = 0;
4059         int num_param = 0;
4060
4061         /* now it may be a reset or a reset-response */
4062         chk_length = ntohs(sr_req->ch.chunk_length);
4063
4064         /* setup for adding the response */
4065         sctp_alloc_a_chunk(stcb, chk);
4066         if (chk == NULL) {
4067                 return (ret_code);
4068         }
4069         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
4070         chk->rec.chunk_id.can_take_data = 0;
4071         chk->asoc = &stcb->asoc;
4072         chk->no_fr_allowed = 0;
4073         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
4074         chk->book_size_scale = 0;
4075         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
4076         if (chk->data == NULL) {
4077 strres_nochunk:
4078                 if (chk->data) {
4079                         sctp_m_freem(chk->data);
4080                         chk->data = NULL;
4081                 }
4082                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
4083                 return (ret_code);
4084         }
4085         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
4086
4087         /* setup chunk parameters */
4088         chk->sent = SCTP_DATAGRAM_UNSENT;
4089         chk->snd_count = 0;
4090         chk->whoTo = NULL;
4091
4092         ch = mtod(chk->data, struct sctp_chunkhdr *);
4093         ch->chunk_type = SCTP_STREAM_RESET;
4094         ch->chunk_flags = 0;
4095         ch->chunk_length = htons(chk->send_size);
4096         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4097         offset += sizeof(struct sctp_chunkhdr);
4098         while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) {
4099                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore);
4100                 if (ph == NULL)
4101                         break;
4102                 param_len = ntohs(ph->param_length);
4103                 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) {
4104                         /* bad param */
4105                         break;
4106                 }
4107                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)),
4108                     (uint8_t *) & cstore);
4109                 ptype = ntohs(ph->param_type);
4110                 num_param++;
4111                 if (param_len > (int)sizeof(cstore)) {
4112                         trunc = 1;
4113                 } else {
4114                         trunc = 0;
4115                 }
4116                 if (num_param > SCTP_MAX_RESET_PARAMS) {
4117                         /* hit the max of parameters already sorry.. */
4118                         break;
4119                 }
4120                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4121                         struct sctp_stream_reset_out_request *req_out;
4122
4123                         req_out = (struct sctp_stream_reset_out_request *)ph;
4124                         num_req++;
4125                         if (stcb->asoc.stream_reset_outstanding) {
4126                                 seq = ntohl(req_out->response_seq);
4127                                 if (seq == stcb->asoc.str_reset_seq_out) {
4128                                         /* implicit ack */
4129                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4130                                 }
4131                         }
4132                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4133                 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4134                         struct sctp_stream_reset_add_strm *str_add;
4135
4136                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4137                         num_req++;
4138                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4139                 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4140                         struct sctp_stream_reset_add_strm *str_add;
4141
4142                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4143                         num_req++;
4144                         sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4145                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4146                         struct sctp_stream_reset_in_request *req_in;
4147
4148                         num_req++;
4149                         req_in = (struct sctp_stream_reset_in_request *)ph;
4150                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4151                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4152                         struct sctp_stream_reset_tsn_request *req_tsn;
4153
4154                         num_req++;
4155                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4156                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4157                                 ret_code = 1;
4158                                 goto strres_nochunk;
4159                         }
4160                         /* no more */
4161                         break;
4162                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4163                         struct sctp_stream_reset_response *resp;
4164                         uint32_t result;
4165
4166                         resp = (struct sctp_stream_reset_response *)ph;
4167                         seq = ntohl(resp->response_seq);
4168                         result = ntohl(resp->result);
4169                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4170                                 ret_code = 1;
4171                                 goto strres_nochunk;
4172                         }
4173                 } else {
4174                         break;
4175                 }
4176                 offset += SCTP_SIZE32(param_len);
4177                 chk_length -= SCTP_SIZE32(param_len);
4178         }
4179         if (num_req == 0) {
4180                 /* we have no response free the stuff */
4181                 goto strres_nochunk;
4182         }
4183         /* ok we have a chunk to link in */
4184         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4185             chk,
4186             sctp_next);
4187         stcb->asoc.ctrl_queue_cnt++;
4188         return (ret_code);
4189 }
4190
4191 /*
4192  * Handle a router or endpoints report of a packet loss, there are two ways
4193  * to handle this, either we get the whole packet and must disect it
4194  * ourselves (possibly with truncation and or corruption) or it is a summary
4195  * from a middle box that did the disectting for us.
4196  */
4197 static void
4198 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4199     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4200 {
4201         uint32_t bottle_bw, on_queue;
4202         uint16_t trunc_len;
4203         unsigned int chlen;
4204         unsigned int at;
4205         struct sctp_chunk_desc desc;
4206         struct sctp_chunkhdr *ch;
4207
4208         chlen = ntohs(cp->ch.chunk_length);
4209         chlen -= sizeof(struct sctp_pktdrop_chunk);
4210         /* XXX possible chlen underflow */
4211         if (chlen == 0) {
4212                 ch = NULL;
4213                 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
4214                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4215         } else {
4216                 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
4217                 chlen -= sizeof(struct sctphdr);
4218                 /* XXX possible chlen underflow */
4219                 memset(&desc, 0, sizeof(desc));
4220         }
4221         trunc_len = (uint16_t) ntohs(cp->trunc_len);
4222         if (trunc_len > limit) {
4223                 trunc_len = limit;
4224         }
4225         /* now the chunks themselves */
4226         while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
4227                 desc.chunk_type = ch->chunk_type;
4228                 /* get amount we need to move */
4229                 at = ntohs(ch->chunk_length);
4230                 if (at < sizeof(struct sctp_chunkhdr)) {
4231                         /* corrupt chunk, maybe at the end? */
4232                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4233                         break;
4234                 }
4235                 if (trunc_len == 0) {
4236                         /* we are supposed to have all of it */
4237                         if (at > chlen) {
4238                                 /* corrupt skip it */
4239                                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4240                                 break;
4241                         }
4242                 } else {
4243                         /* is there enough of it left ? */
4244                         if (desc.chunk_type == SCTP_DATA) {
4245                                 if (chlen < (sizeof(struct sctp_data_chunk) +
4246                                     sizeof(desc.data_bytes))) {
4247                                         break;
4248                                 }
4249                         } else {
4250                                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4251                                         break;
4252                                 }
4253                         }
4254                 }
4255                 if (desc.chunk_type == SCTP_DATA) {
4256                         /* can we get out the tsn? */
4257                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4258                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4259
4260                         if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
4261                                 /* yep */
4262                                 struct sctp_data_chunk *dcp;
4263                                 uint8_t *ddp;
4264                                 unsigned int iii;
4265
4266                                 dcp = (struct sctp_data_chunk *)ch;
4267                                 ddp = (uint8_t *) (dcp + 1);
4268                                 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
4269                                         desc.data_bytes[iii] = ddp[iii];
4270                                 }
4271                                 desc.tsn_ifany = dcp->dp.tsn;
4272                         } else {
4273                                 /* nope we are done. */
4274                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4275                                 break;
4276                         }
4277                 } else {
4278                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4279                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4280                 }
4281
4282                 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
4283                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4284                         break;
4285                 }
4286                 if (SCTP_SIZE32(at) > chlen) {
4287                         break;
4288                 }
4289                 chlen -= SCTP_SIZE32(at);
4290                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4291                         /* done, none left */
4292                         break;
4293                 }
4294                 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
4295         }
4296         /* Now update any rwnd --- possibly */
4297         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4298                 /* From a peer, we get a rwnd report */
4299                 uint32_t a_rwnd;
4300
4301                 SCTP_STAT_INCR(sctps_pdrpfehos);
4302
4303                 bottle_bw = ntohl(cp->bottle_bw);
4304                 on_queue = ntohl(cp->current_onq);
4305                 if (bottle_bw && on_queue) {
4306                         /* a rwnd report is in here */
4307                         if (bottle_bw > on_queue)
4308                                 a_rwnd = bottle_bw - on_queue;
4309                         else
4310                                 a_rwnd = 0;
4311
4312                         if (a_rwnd == 0)
4313                                 stcb->asoc.peers_rwnd = 0;
4314                         else {
4315                                 if (a_rwnd > stcb->asoc.total_flight) {
4316                                         stcb->asoc.peers_rwnd =
4317                                             a_rwnd - stcb->asoc.total_flight;
4318                                 } else {
4319                                         stcb->asoc.peers_rwnd = 0;
4320                                 }
4321                                 if (stcb->asoc.peers_rwnd <
4322                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4323                                         /* SWS sender side engages */
4324                                         stcb->asoc.peers_rwnd = 0;
4325                                 }
4326                         }
4327                 }
4328         } else {
4329                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4330         }
4331
4332         /* now middle boxes in sat networks get a cwnd bump */
4333         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
4334             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4335             (stcb->asoc.sat_network)) {
4336                 /*
4337                  * This is debateable but for sat networks it makes sense
4338                  * Note if a T3 timer has went off, we will prohibit any
4339                  * changes to cwnd until we exit the t3 loss recovery.
4340                  */
4341                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4342                     net, cp, &bottle_bw, &on_queue);
4343         }
4344 }
4345
4346 /*
4347  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4348  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4349  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4350  * length of the complete packet outputs: - length: modified to remaining
4351  * length after control processing - netp: modified to new sctp_nets after
4352  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4353  * bad packet,...) otherwise return the tcb for this packet
4354  */
4355 #ifdef __GNUC__
4356 __attribute__((noinline))
4357 #endif
4358         static struct sctp_tcb *
4359                  sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4360              struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4361              struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4362              uint32_t vrf_id, uint16_t port)
4363 {
4364         struct sctp_association *asoc;
4365         uint32_t vtag_in;
4366         int num_chunks = 0;     /* number of control chunks processed */
4367         uint32_t chk_length;
4368         int ret;
4369         int abort_no_unlock = 0;
4370         int ecne_seen = 0;
4371
4372         /*
4373          * How big should this be, and should it be alloc'd? Lets try the
4374          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4375          * until we get into jumbo grams and such..
4376          */
4377         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4378         struct sctp_tcb *locked_tcb = stcb;
4379         int got_auth = 0;
4380         uint32_t auth_offset = 0, auth_len = 0;
4381         int auth_skipped = 0;
4382         int asconf_cnt = 0;
4383
4384 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4385         struct socket *so;
4386
4387 #endif
4388
4389         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4390             iphlen, *offset, length, stcb);
4391
4392         /* validate chunk header length... */
4393         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4394                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4395                     ntohs(ch->chunk_length));
4396                 if (locked_tcb) {
4397                         SCTP_TCB_UNLOCK(locked_tcb);
4398                 }
4399                 return (NULL);
4400         }
4401         /*
4402          * validate the verification tag
4403          */
4404         vtag_in = ntohl(sh->v_tag);
4405
4406         if (locked_tcb) {
4407                 SCTP_TCB_LOCK_ASSERT(locked_tcb);
4408         }
4409         if (ch->chunk_type == SCTP_INITIATION) {
4410                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4411                     ntohs(ch->chunk_length), vtag_in);
4412                 if (vtag_in != 0) {
4413                         /* protocol error- silently discard... */
4414                         SCTP_STAT_INCR(sctps_badvtag);
4415                         if (locked_tcb) {
4416                                 SCTP_TCB_UNLOCK(locked_tcb);
4417                         }
4418                         return (NULL);
4419                 }
4420         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4421                 /*
4422                  * If there is no stcb, skip the AUTH chunk and process
4423                  * later after a stcb is found (to validate the lookup was
4424                  * valid.
4425                  */
4426                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4427                     (stcb == NULL) &&
4428                     !SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4429                         /* save this chunk for later processing */
4430                         auth_skipped = 1;
4431                         auth_offset = *offset;
4432                         auth_len = ntohs(ch->chunk_length);
4433
4434                         /* (temporarily) move past this chunk */
4435                         *offset += SCTP_SIZE32(auth_len);
4436                         if (*offset >= length) {
4437                                 /* no more data left in the mbuf chain */
4438                                 *offset = length;
4439                                 if (locked_tcb) {
4440                                         SCTP_TCB_UNLOCK(locked_tcb);
4441                                 }
4442                                 return (NULL);
4443                         }
4444                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4445                             sizeof(struct sctp_chunkhdr), chunk_buf);
4446                 }
4447                 if (ch == NULL) {
4448                         /* Help */
4449                         *offset = length;
4450                         if (locked_tcb) {
4451                                 SCTP_TCB_UNLOCK(locked_tcb);
4452                         }
4453                         return (NULL);
4454                 }
4455                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4456                         goto process_control_chunks;
4457                 }
4458                 /*
4459                  * first check if it's an ASCONF with an unknown src addr we
4460                  * need to look inside to find the association
4461                  */
4462                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4463                         struct sctp_chunkhdr *asconf_ch = ch;
4464                         uint32_t asconf_offset = 0, asconf_len = 0;
4465
4466                         /* inp's refcount may be reduced */
4467                         SCTP_INP_INCR_REF(inp);
4468
4469                         asconf_offset = *offset;
4470                         do {
4471                                 asconf_len = ntohs(asconf_ch->chunk_length);
4472                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4473                                         break;
4474                                 stcb = sctp_findassociation_ep_asconf(m,
4475                                     *offset, sh, &inp, netp, vrf_id);
4476                                 if (stcb != NULL)
4477                                         break;
4478                                 asconf_offset += SCTP_SIZE32(asconf_len);
4479                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4480                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4481                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4482                         if (stcb == NULL) {
4483                                 /*
4484                                  * reduce inp's refcount if not reduced in
4485                                  * sctp_findassociation_ep_asconf().
4486                                  */
4487                                 SCTP_INP_DECR_REF(inp);
4488                         } else {
4489                                 locked_tcb = stcb;
4490                         }
4491
4492                         /* now go back and verify any auth chunk to be sure */
4493                         if (auth_skipped && (stcb != NULL)) {
4494                                 struct sctp_auth_chunk *auth;
4495
4496                                 auth = (struct sctp_auth_chunk *)
4497                                     sctp_m_getptr(m, auth_offset,
4498                                     auth_len, chunk_buf);
4499                                 got_auth = 1;
4500                                 auth_skipped = 0;
4501                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4502                                     auth_offset)) {
4503                                         /* auth HMAC failed so dump it */
4504                                         *offset = length;
4505                                         if (locked_tcb) {
4506                                                 SCTP_TCB_UNLOCK(locked_tcb);
4507                                         }
4508                                         return (NULL);
4509                                 } else {
4510                                         /* remaining chunks are HMAC checked */
4511                                         stcb->asoc.authenticated = 1;
4512                                 }
4513                         }
4514                 }
4515                 if (stcb == NULL) {
4516                         /* no association, so it's out of the blue... */
4517                         sctp_handle_ootb(m, iphlen, *offset, sh, inp, NULL,
4518                             vrf_id, port);
4519                         *offset = length;
4520                         if (locked_tcb) {
4521                                 SCTP_TCB_UNLOCK(locked_tcb);
4522                         }
4523                         return (NULL);
4524                 }
4525                 asoc = &stcb->asoc;
4526                 /* ABORT and SHUTDOWN can use either v_tag... */
4527                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4528                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4529                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4530                         if ((vtag_in == asoc->my_vtag) ||
4531                             ((ch->chunk_flags & SCTP_HAD_NO_TCB) &&
4532                             (vtag_in == asoc->peer_vtag))) {
4533                                 /* this is valid */
4534                         } else {
4535                                 /* drop this packet... */
4536                                 SCTP_STAT_INCR(sctps_badvtag);
4537                                 if (locked_tcb) {
4538                                         SCTP_TCB_UNLOCK(locked_tcb);
4539                                 }
4540                                 return (NULL);
4541                         }
4542                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4543                         if (vtag_in != asoc->my_vtag) {
4544                                 /*
4545                                  * this could be a stale SHUTDOWN-ACK or the
4546                                  * peer never got the SHUTDOWN-COMPLETE and
4547                                  * is still hung; we have started a new asoc
4548                                  * but it won't complete until the shutdown
4549                                  * is completed
4550                                  */
4551                                 if (locked_tcb) {
4552                                         SCTP_TCB_UNLOCK(locked_tcb);
4553                                 }
4554                                 sctp_handle_ootb(m, iphlen, *offset, sh, inp,
4555                                     NULL, vrf_id, port);
4556                                 return (NULL);
4557                         }
4558                 } else {
4559                         /* for all other chunks, vtag must match */
4560                         if (vtag_in != asoc->my_vtag) {
4561                                 /* invalid vtag... */
4562                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4563                                     "invalid vtag: %xh, expect %xh\n",
4564                                     vtag_in, asoc->my_vtag);
4565                                 SCTP_STAT_INCR(sctps_badvtag);
4566                                 if (locked_tcb) {
4567                                         SCTP_TCB_UNLOCK(locked_tcb);
4568                                 }
4569                                 *offset = length;
4570                                 return (NULL);
4571                         }
4572                 }
4573         }                       /* end if !SCTP_COOKIE_ECHO */
4574         /*
4575          * process all control chunks...
4576          */
4577         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4578             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4579             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4580             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
4581                 /* implied cookie-ack.. we must have lost the ack */
4582                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4583                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4584                             stcb->asoc.overall_error_count,
4585                             0,
4586                             SCTP_FROM_SCTP_INPUT,
4587                             __LINE__);
4588                 }
4589                 stcb->asoc.overall_error_count = 0;
4590                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4591                     *netp);
4592         }
4593 process_control_chunks:
4594         while (IS_SCTP_CONTROL(ch)) {
4595                 /* validate chunk length */
4596                 chk_length = ntohs(ch->chunk_length);
4597                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4598                     ch->chunk_type, chk_length);
4599                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4600                 if (chk_length < sizeof(*ch) ||
4601                     (*offset + (int)chk_length) > length) {
4602                         *offset = length;
4603                         if (locked_tcb) {
4604                                 SCTP_TCB_UNLOCK(locked_tcb);
4605                         }
4606                         return (NULL);
4607                 }
4608                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4609                 /*
4610                  * INIT-ACK only gets the init ack "header" portion only
4611                  * because we don't have to process the peer's COOKIE. All
4612                  * others get a complete chunk.
4613                  */
4614                 if ((ch->chunk_type == SCTP_INITIATION_ACK) ||
4615                     (ch->chunk_type == SCTP_INITIATION)) {
4616                         /* get an init-ack chunk */
4617                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4618                             sizeof(struct sctp_init_ack_chunk), chunk_buf);
4619                         if (ch == NULL) {
4620                                 *offset = length;
4621                                 if (locked_tcb) {
4622                                         SCTP_TCB_UNLOCK(locked_tcb);
4623                                 }
4624                                 return (NULL);
4625                         }
4626                 } else {
4627                         /* For cookies and all other chunks. */
4628                         if (chk_length > sizeof(chunk_buf)) {
4629                                 /*
4630                                  * use just the size of the chunk buffer so
4631                                  * the front part of our chunks fit in
4632                                  * contiguous space up to the chunk buffer
4633                                  * size (508 bytes). For chunks that need to
4634                                  * get more than that they must use the
4635                                  * sctp_m_getptr() function or other means
4636                                  * (e.g. know how to parse mbuf chains).
4637                                  * Cookies do this already.
4638                                  */
4639                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4640                                     (sizeof(chunk_buf) - 4),
4641                                     chunk_buf);
4642                                 if (ch == NULL) {
4643                                         *offset = length;
4644                                         if (locked_tcb) {
4645                                                 SCTP_TCB_UNLOCK(locked_tcb);
4646                                         }
4647                                         return (NULL);
4648                                 }
4649                         } else {
4650                                 /* We can fit it all */
4651                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4652                                     chk_length, chunk_buf);
4653                                 if (ch == NULL) {
4654                                         SCTP_PRINTF("sctp_process_control: Can't get the all data....\n");
4655                                         *offset = length;
4656                                         if (locked_tcb) {
4657                                                 SCTP_TCB_UNLOCK(locked_tcb);
4658                                         }
4659                                         return (NULL);
4660                                 }
4661                         }
4662                 }
4663                 num_chunks++;
4664                 /* Save off the last place we got a control from */
4665                 if (stcb != NULL) {
4666                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4667                                 /*
4668                                  * allow last_control to be NULL if
4669                                  * ASCONF... ASCONF processing will find the
4670                                  * right net later
4671                                  */
4672                                 if ((netp != NULL) && (*netp != NULL))
4673                                         stcb->asoc.last_control_chunk_from = *netp;
4674                         }
4675                 }
4676 #ifdef SCTP_AUDITING_ENABLED
4677                 sctp_audit_log(0xB0, ch->chunk_type);
4678 #endif
4679
4680                 /* check to see if this chunk required auth, but isn't */
4681                 if ((stcb != NULL) &&
4682                     !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
4683                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4684                     !stcb->asoc.authenticated) {
4685                         /* "silently" ignore */
4686                         SCTP_STAT_INCR(sctps_recvauthmissing);
4687                         goto next_chunk;
4688                 }
4689                 switch (ch->chunk_type) {
4690                 case SCTP_INITIATION:
4691                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4692                         /* The INIT chunk must be the only chunk. */
4693                         if ((num_chunks > 1) ||
4694                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4695                                 sctp_abort_association(inp, stcb, m,
4696                                     iphlen, sh, NULL, vrf_id, port);
4697                                 *offset = length;
4698                                 return (NULL);
4699                         }
4700                         /* Honor our resource limit. */
4701                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4702                                 struct mbuf *op_err;
4703
4704                                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
4705                                 sctp_abort_association(inp, stcb, m,
4706                                     iphlen, sh, op_err, vrf_id, port);
4707                                 *offset = length;
4708                                 return (NULL);
4709                         }
4710                         sctp_handle_init(m, iphlen, *offset, sh,
4711                             (struct sctp_init_chunk *)ch, inp,
4712                             stcb, &abort_no_unlock, vrf_id, port);
4713                         *offset = length;
4714                         if ((!abort_no_unlock) && (locked_tcb)) {
4715                                 SCTP_TCB_UNLOCK(locked_tcb);
4716                         }
4717                         return (NULL);
4718                         break;
4719                 case SCTP_PAD_CHUNK:
4720                         break;
4721                 case SCTP_INITIATION_ACK:
4722                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n");
4723                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4724                                 /* We are not interested anymore */
4725                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4726                                         ;
4727                                 } else {
4728                                         if (locked_tcb != stcb) {
4729                                                 /* Very unlikely */
4730                                                 SCTP_TCB_UNLOCK(locked_tcb);
4731                                         }
4732                                         *offset = length;
4733                                         if (stcb) {
4734 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4735                                                 so = SCTP_INP_SO(inp);
4736                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4737                                                 SCTP_TCB_UNLOCK(stcb);
4738                                                 SCTP_SOCKET_LOCK(so, 1);
4739                                                 SCTP_TCB_LOCK(stcb);
4740                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4741 #endif
4742                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
4743 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4744                                                 SCTP_SOCKET_UNLOCK(so, 1);
4745 #endif
4746                                         }
4747                                         return (NULL);
4748                                 }
4749                         }
4750                         /* The INIT-ACK chunk must be the only chunk. */
4751                         if ((num_chunks > 1) ||
4752                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4753                                 *offset = length;
4754                                 if (locked_tcb) {
4755                                         SCTP_TCB_UNLOCK(locked_tcb);
4756                                 }
4757                                 return (NULL);
4758                         }
4759                         if ((netp) && (*netp)) {
4760                                 ret = sctp_handle_init_ack(m, iphlen, *offset, sh,
4761                                     (struct sctp_init_ack_chunk *)ch, stcb, *netp, &abort_no_unlock, vrf_id);
4762                         } else {
4763                                 ret = -1;
4764                         }
4765                         *offset = length;
4766                         if (abort_no_unlock) {
4767                                 return (NULL);
4768                         }
4769                         /*
4770                          * Special case, I must call the output routine to
4771                          * get the cookie echoed
4772                          */
4773                         if ((stcb != NULL) && (ret == 0)) {
4774                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4775                         }
4776                         if (locked_tcb) {
4777                                 SCTP_TCB_UNLOCK(locked_tcb);
4778                         }
4779                         return (NULL);
4780                         break;
4781                 case SCTP_SELECTIVE_ACK:
4782                         {
4783                                 struct sctp_sack_chunk *sack;
4784                                 int abort_now = 0;
4785                                 uint32_t a_rwnd, cum_ack;
4786                                 uint16_t num_seg, num_dup;
4787                                 uint8_t flags;
4788                                 int offset_seg, offset_dup;
4789
4790                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n");
4791                                 SCTP_STAT_INCR(sctps_recvsacks);
4792                                 if (stcb == NULL) {
4793                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n");
4794                                         break;
4795                                 }
4796                                 if (chk_length < sizeof(struct sctp_sack_chunk)) {
4797                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4798                                         break;
4799                                 }
4800                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4801                                         /*-
4802                                          * If we have sent a shutdown-ack, we will pay no
4803                                          * attention to a sack sent in to us since
4804                                          * we don't care anymore.
4805                                          */
4806                                         break;
4807                                 }
4808                                 sack = (struct sctp_sack_chunk *)ch;
4809                                 flags = ch->chunk_flags;
4810                                 cum_ack = ntohl(sack->sack.cum_tsn_ack);
4811                                 num_seg = ntohs(sack->sack.num_gap_ack_blks);
4812                                 num_dup = ntohs(sack->sack.num_dup_tsns);
4813                                 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd);
4814                                 if (sizeof(struct sctp_sack_chunk) +
4815                                     num_seg * sizeof(struct sctp_gap_ack_block) +
4816                                     num_dup * sizeof(uint32_t) != chk_length) {
4817                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4818                                         break;
4819                                 }
4820                                 offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4821                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4822                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4823                                     cum_ack, num_seg, a_rwnd);
4824                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4825                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4826                                     (num_seg == 0) &&
4827                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4828                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4829                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4830                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))
4831                                     ) {
4832                                         /*
4833                                          * We have a SIMPLE sack having no
4834                                          * prior segments and data on sent
4835                                          * queue to be acked.. Use the
4836                                          * faster path sack processing. We
4837                                          * also allow window update sacks
4838                                          * with no missing segments to go
4839                                          * this way too.
4840                                          */
4841                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen);
4842                                 } else {
4843                                         if (netp && *netp)
4844                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4845                                                     num_seg, 0, num_dup, &abort_now, flags,
4846                                                     cum_ack, a_rwnd, ecne_seen);
4847                                 }
4848                                 if (abort_now) {
4849                                         /* ABORT signal from sack processing */
4850                                         *offset = length;
4851                                         return (NULL);
4852                                 }
4853                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4854                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4855                                     (stcb->asoc.stream_queue_cnt == 0)) {
4856                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4857                                 }
4858                         }
4859                         break;
4860                         /*
4861                          * EY - nr_sack:  If the received chunk is an
4862                          * nr_sack chunk
4863                          */
4864                 case SCTP_NR_SELECTIVE_ACK:
4865                         {
4866                                 struct sctp_nr_sack_chunk *nr_sack;
4867                                 int abort_now = 0;
4868                                 uint32_t a_rwnd, cum_ack;
4869                                 uint16_t num_seg, num_nr_seg, num_dup;
4870                                 uint8_t flags;
4871                                 int offset_seg, offset_dup;
4872
4873                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n");
4874                                 SCTP_STAT_INCR(sctps_recvsacks);
4875                                 if (stcb == NULL) {
4876                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n");
4877                                         break;
4878                                 }
4879                                 if ((stcb->asoc.sctp_nr_sack_on_off == 0) ||
4880                                     (stcb->asoc.peer_supports_nr_sack == 0)) {
4881                                         goto unknown_chunk;
4882                                 }
4883                                 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
4884                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n");
4885                                         break;
4886                                 }
4887                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4888                                         /*-
4889                                          * If we have sent a shutdown-ack, we will pay no
4890                                          * attention to a sack sent in to us since
4891                                          * we don't care anymore.
4892                                          */
4893                                         break;
4894                                 }
4895                                 nr_sack = (struct sctp_nr_sack_chunk *)ch;
4896                                 flags = ch->chunk_flags;
4897                                 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
4898                                 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
4899                                 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
4900                                 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
4901                                 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd);
4902                                 if (sizeof(struct sctp_nr_sack_chunk) +
4903                                     (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
4904                                     num_dup * sizeof(uint32_t) != chk_length) {
4905                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
4906                                         break;
4907                                 }
4908                                 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
4909                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4910                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4911                                     cum_ack, num_seg, a_rwnd);
4912                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4913                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4914                                     (num_seg == 0) && (num_nr_seg == 0) &&
4915                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4916                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4917                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4918                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
4919                                         /*
4920                                          * We have a SIMPLE sack having no
4921                                          * prior segments and data on sent
4922                                          * queue to be acked. Use the faster
4923                                          * path sack processing. We also
4924                                          * allow window update sacks with no
4925                                          * missing segments to go this way
4926                                          * too.
4927                                          */
4928                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
4929                                             &abort_now, ecne_seen);
4930                                 } else {
4931                                         if (netp && *netp)
4932                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4933                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
4934                                                     cum_ack, a_rwnd, ecne_seen);
4935                                 }
4936                                 if (abort_now) {
4937                                         /* ABORT signal from sack processing */
4938                                         *offset = length;
4939                                         return (NULL);
4940                                 }
4941                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4942                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4943                                     (stcb->asoc.stream_queue_cnt == 0)) {
4944                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4945                                 }
4946                         }
4947                         break;
4948
4949                 case SCTP_HEARTBEAT_REQUEST:
4950                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
4951                         if ((stcb) && netp && *netp) {
4952                                 SCTP_STAT_INCR(sctps_recvheartbeat);
4953                                 sctp_send_heartbeat_ack(stcb, m, *offset,
4954                                     chk_length, *netp);
4955
4956                                 /* He's alive so give him credit */
4957                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4958                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4959                                             stcb->asoc.overall_error_count,
4960                                             0,
4961                                             SCTP_FROM_SCTP_INPUT,
4962                                             __LINE__);
4963                                 }
4964                                 stcb->asoc.overall_error_count = 0;
4965                         }
4966                         break;
4967                 case SCTP_HEARTBEAT_ACK:
4968                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n");
4969                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
4970                                 /* Its not ours */
4971                                 *offset = length;
4972                                 if (locked_tcb) {
4973                                         SCTP_TCB_UNLOCK(locked_tcb);
4974                                 }
4975                                 return (NULL);
4976                         }
4977                         /* He's alive so give him credit */
4978                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4979                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4980                                     stcb->asoc.overall_error_count,
4981                                     0,
4982                                     SCTP_FROM_SCTP_INPUT,
4983                                     __LINE__);
4984                         }
4985                         stcb->asoc.overall_error_count = 0;
4986                         SCTP_STAT_INCR(sctps_recvheartbeatack);
4987                         if (netp && *netp)
4988                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
4989                                     stcb, *netp);
4990                         break;
4991                 case SCTP_ABORT_ASSOCIATION:
4992                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
4993                             stcb);
4994                         if ((stcb) && netp && *netp)
4995                                 sctp_handle_abort((struct sctp_abort_chunk *)ch,
4996                                     stcb, *netp);
4997                         *offset = length;
4998                         return (NULL);
4999                         break;
5000                 case SCTP_SHUTDOWN:
5001                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
5002                             stcb);
5003                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
5004                                 *offset = length;
5005                                 if (locked_tcb) {
5006                                         SCTP_TCB_UNLOCK(locked_tcb);
5007                                 }
5008                                 return (NULL);
5009                         }
5010                         if (netp && *netp) {
5011                                 int abort_flag = 0;
5012
5013                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
5014                                     stcb, *netp, &abort_flag);
5015                                 if (abort_flag) {
5016                                         *offset = length;
5017                                         return (NULL);
5018                                 }
5019                         }
5020                         break;
5021                 case SCTP_SHUTDOWN_ACK:
5022                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", stcb);
5023                         if ((stcb) && (netp) && (*netp))
5024                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
5025                         *offset = length;
5026                         return (NULL);
5027                         break;
5028
5029                 case SCTP_OPERATION_ERROR:
5030                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n");
5031                         if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) {
5032                                 *offset = length;
5033                                 return (NULL);
5034                         }
5035                         break;
5036                 case SCTP_COOKIE_ECHO:
5037                         SCTPDBG(SCTP_DEBUG_INPUT3,
5038                             "SCTP_COOKIE-ECHO, stcb %p\n", stcb);
5039                         if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5040                                 ;
5041                         } else {
5042                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5043                                         /* We are not interested anymore */
5044                         abend:
5045                                         if (stcb) {
5046                                                 SCTP_TCB_UNLOCK(stcb);
5047                                         }
5048                                         *offset = length;
5049                                         return (NULL);
5050                                 }
5051                         }
5052                         /*
5053                          * First are we accepting? We do this again here
5054                          * since it is possible that a previous endpoint WAS
5055                          * listening responded to a INIT-ACK and then
5056                          * closed. We opened and bound.. and are now no
5057                          * longer listening.
5058                          */
5059
5060                         if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) {
5061                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
5062                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
5063                                         struct mbuf *op_err;
5064
5065                                         op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
5066                                         sctp_abort_association(inp, stcb, m,
5067                                             iphlen, sh, op_err, vrf_id, port);
5068                                 }
5069                                 *offset = length;
5070                                 return (NULL);
5071                         } else {
5072                                 struct mbuf *ret_buf;
5073                                 struct sctp_inpcb *linp;
5074
5075                                 if (stcb) {
5076                                         linp = NULL;
5077                                 } else {
5078                                         linp = inp;
5079                                 }
5080
5081                                 if (linp) {
5082                                         SCTP_ASOC_CREATE_LOCK(linp);
5083                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
5084                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
5085                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
5086                                                 goto abend;
5087                                         }
5088                                 }
5089                                 if (netp) {
5090                                         ret_buf =
5091                                             sctp_handle_cookie_echo(m, iphlen,
5092                                             *offset, sh,
5093                                             (struct sctp_cookie_echo_chunk *)ch,
5094                                             &inp, &stcb, netp,
5095                                             auth_skipped,
5096                                             auth_offset,
5097                                             auth_len,
5098                                             &locked_tcb,
5099                                             vrf_id,
5100                                             port);
5101                                 } else {
5102                                         ret_buf = NULL;
5103                                 }
5104                                 if (linp) {
5105                                         SCTP_ASOC_CREATE_UNLOCK(linp);
5106                                 }
5107                                 if (ret_buf == NULL) {
5108                                         if (locked_tcb) {
5109                                                 SCTP_TCB_UNLOCK(locked_tcb);
5110                                         }
5111                                         SCTPDBG(SCTP_DEBUG_INPUT3,
5112                                             "GAK, null buffer\n");
5113                                         *offset = length;
5114                                         return (NULL);
5115                                 }
5116                                 /* if AUTH skipped, see if it verified... */
5117                                 if (auth_skipped) {
5118                                         got_auth = 1;
5119                                         auth_skipped = 0;
5120                                 }
5121                                 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
5122                                         /*
5123                                          * Restart the timer if we have
5124                                          * pending data
5125                                          */
5126                                         struct sctp_tmit_chunk *chk;
5127
5128                                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
5129                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
5130                                 }
5131                         }
5132                         break;
5133                 case SCTP_COOKIE_ACK:
5134                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", stcb);
5135                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5136                                 if (locked_tcb) {
5137                                         SCTP_TCB_UNLOCK(locked_tcb);
5138                                 }
5139                                 return (NULL);
5140                         }
5141                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5142                                 /* We are not interested anymore */
5143                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5144                                         ;
5145                                 } else if (stcb) {
5146 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5147                                         so = SCTP_INP_SO(inp);
5148                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5149                                         SCTP_TCB_UNLOCK(stcb);
5150                                         SCTP_SOCKET_LOCK(so, 1);
5151                                         SCTP_TCB_LOCK(stcb);
5152                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5153 #endif
5154                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
5155 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5156                                         SCTP_SOCKET_UNLOCK(so, 1);
5157 #endif
5158                                         *offset = length;
5159                                         return (NULL);
5160                                 }
5161                         }
5162                         /* He's alive so give him credit */
5163                         if ((stcb) && netp && *netp) {
5164                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5165                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5166                                             stcb->asoc.overall_error_count,
5167                                             0,
5168                                             SCTP_FROM_SCTP_INPUT,
5169                                             __LINE__);
5170                                 }
5171                                 stcb->asoc.overall_error_count = 0;
5172                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
5173                         }
5174                         break;
5175                 case SCTP_ECN_ECHO:
5176                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n");
5177                         /* He's alive so give him credit */
5178                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5179                                 /* Its not ours */
5180                                 if (locked_tcb) {
5181                                         SCTP_TCB_UNLOCK(locked_tcb);
5182                                 }
5183                                 *offset = length;
5184                                 return (NULL);
5185                         }
5186                         if (stcb) {
5187                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5188                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5189                                             stcb->asoc.overall_error_count,
5190                                             0,
5191                                             SCTP_FROM_SCTP_INPUT,
5192                                             __LINE__);
5193                                 }
5194                                 stcb->asoc.overall_error_count = 0;
5195                                 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch,
5196                                     stcb);
5197                                 ecne_seen = 1;
5198                         }
5199                         break;
5200                 case SCTP_ECN_CWR:
5201                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n");
5202                         /* He's alive so give him credit */
5203                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5204                                 /* Its not ours */
5205                                 if (locked_tcb) {
5206                                         SCTP_TCB_UNLOCK(locked_tcb);
5207                                 }
5208                                 *offset = length;
5209                                 return (NULL);
5210                         }
5211                         if (stcb) {
5212                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5213                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5214                                             stcb->asoc.overall_error_count,
5215                                             0,
5216                                             SCTP_FROM_SCTP_INPUT,
5217                                             __LINE__);
5218                                 }
5219                                 stcb->asoc.overall_error_count = 0;
5220                                 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5221                         }
5222                         break;
5223                 case SCTP_SHUTDOWN_COMPLETE:
5224                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", stcb);
5225                         /* must be first and only chunk */
5226                         if ((num_chunks > 1) ||
5227                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5228                                 *offset = length;
5229                                 if (locked_tcb) {
5230                                         SCTP_TCB_UNLOCK(locked_tcb);
5231                                 }
5232                                 return (NULL);
5233                         }
5234                         if ((stcb) && netp && *netp) {
5235                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5236                                     stcb, *netp);
5237                         }
5238                         *offset = length;
5239                         return (NULL);
5240                         break;
5241                 case SCTP_ASCONF:
5242                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5243                         /* He's alive so give him credit */
5244                         if (stcb) {
5245                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5246                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5247                                             stcb->asoc.overall_error_count,
5248                                             0,
5249                                             SCTP_FROM_SCTP_INPUT,
5250                                             __LINE__);
5251                                 }
5252                                 stcb->asoc.overall_error_count = 0;
5253                                 sctp_handle_asconf(m, *offset,
5254                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5255                                 asconf_cnt++;
5256                         }
5257                         break;
5258                 case SCTP_ASCONF_ACK:
5259                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n");
5260                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5261                                 /* Its not ours */
5262                                 if (locked_tcb) {
5263                                         SCTP_TCB_UNLOCK(locked_tcb);
5264                                 }
5265                                 *offset = length;
5266                                 return (NULL);
5267                         }
5268                         if ((stcb) && netp && *netp) {
5269                                 /* He's alive so give him credit */
5270                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5271                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5272                                             stcb->asoc.overall_error_count,
5273                                             0,
5274                                             SCTP_FROM_SCTP_INPUT,
5275                                             __LINE__);
5276                                 }
5277                                 stcb->asoc.overall_error_count = 0;
5278                                 sctp_handle_asconf_ack(m, *offset,
5279                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5280                                 if (abort_no_unlock)
5281                                         return (NULL);
5282                         }
5283                         break;
5284                 case SCTP_FORWARD_CUM_TSN:
5285                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n");
5286                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5287                                 /* Its not ours */
5288                                 if (locked_tcb) {
5289                                         SCTP_TCB_UNLOCK(locked_tcb);
5290                                 }
5291                                 *offset = length;
5292                                 return (NULL);
5293                         }
5294                         /* He's alive so give him credit */
5295                         if (stcb) {
5296                                 int abort_flag = 0;
5297
5298                                 stcb->asoc.overall_error_count = 0;
5299                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5300                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5301                                             stcb->asoc.overall_error_count,
5302                                             0,
5303                                             SCTP_FROM_SCTP_INPUT,
5304                                             __LINE__);
5305                                 }
5306                                 *fwd_tsn_seen = 1;
5307                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5308                                         /* We are not interested anymore */
5309 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5310                                         so = SCTP_INP_SO(inp);
5311                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5312                                         SCTP_TCB_UNLOCK(stcb);
5313                                         SCTP_SOCKET_LOCK(so, 1);
5314                                         SCTP_TCB_LOCK(stcb);
5315                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5316 #endif
5317                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
5318 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5319                                         SCTP_SOCKET_UNLOCK(so, 1);
5320 #endif
5321                                         *offset = length;
5322                                         return (NULL);
5323                                 }
5324                                 sctp_handle_forward_tsn(stcb,
5325                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5326                                 if (abort_flag) {
5327                                         *offset = length;
5328                                         return (NULL);
5329                                 } else {
5330                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5331                                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5332                                                     stcb->asoc.overall_error_count,
5333                                                     0,
5334                                                     SCTP_FROM_SCTP_INPUT,
5335                                                     __LINE__);
5336                                         }
5337                                         stcb->asoc.overall_error_count = 0;
5338                                 }
5339
5340                         }
5341                         break;
5342                 case SCTP_STREAM_RESET:
5343                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5344                         if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
5345                                 /* Its not ours */
5346                                 if (locked_tcb) {
5347                                         SCTP_TCB_UNLOCK(locked_tcb);
5348                                 }
5349                                 *offset = length;
5350                                 return (NULL);
5351                         }
5352                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5353                                 /* We are not interested anymore */
5354 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5355                                 so = SCTP_INP_SO(inp);
5356                                 atomic_add_int(&stcb->asoc.refcnt, 1);
5357                                 SCTP_TCB_UNLOCK(stcb);
5358                                 SCTP_SOCKET_LOCK(so, 1);
5359                                 SCTP_TCB_LOCK(stcb);
5360                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
5361 #endif
5362                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
5363 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5364                                 SCTP_SOCKET_UNLOCK(so, 1);
5365 #endif
5366                                 *offset = length;
5367                                 return (NULL);
5368                         }
5369                         if (stcb->asoc.peer_supports_strreset == 0) {
5370                                 /*
5371                                  * hmm, peer should have announced this, but
5372                                  * we will turn it on since he is sending us
5373                                  * a stream reset.
5374                                  */
5375                                 stcb->asoc.peer_supports_strreset = 1;
5376                         }
5377                         if (sctp_handle_stream_reset(stcb, m, *offset, (struct sctp_stream_reset_out_req *)ch)) {
5378                                 /* stop processing */
5379                                 *offset = length;
5380                                 return (NULL);
5381                         }
5382                         break;
5383                 case SCTP_PACKET_DROPPED:
5384                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5385                         /* re-get it all please */
5386                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5387                                 /* Its not ours */
5388                                 if (locked_tcb) {
5389                                         SCTP_TCB_UNLOCK(locked_tcb);
5390                                 }
5391                                 *offset = length;
5392                                 return (NULL);
5393                         }
5394                         if (ch && (stcb) && netp && (*netp)) {
5395                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5396                                     stcb, *netp,
5397                                     min(chk_length, (sizeof(chunk_buf) - 4)));
5398
5399                         }
5400                         break;
5401
5402                 case SCTP_AUTHENTICATION:
5403                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5404                         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
5405                                 goto unknown_chunk;
5406
5407                         if (stcb == NULL) {
5408                                 /* save the first AUTH for later processing */
5409                                 if (auth_skipped == 0) {
5410                                         auth_offset = *offset;
5411                                         auth_len = chk_length;
5412                                         auth_skipped = 1;
5413                                 }
5414                                 /* skip this chunk (temporarily) */
5415                                 goto next_chunk;
5416                         }
5417                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5418                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5419                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5420                                 /* Its not ours */
5421                                 if (locked_tcb) {
5422                                         SCTP_TCB_UNLOCK(locked_tcb);
5423                                 }
5424                                 *offset = length;
5425                                 return (NULL);
5426                         }
5427                         if (got_auth == 1) {
5428                                 /* skip this chunk... it's already auth'd */
5429                                 goto next_chunk;
5430                         }
5431                         got_auth = 1;
5432                         if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
5433                             m, *offset)) {
5434                                 /* auth HMAC failed so dump the packet */
5435                                 *offset = length;
5436                                 return (stcb);
5437                         } else {
5438                                 /* remaining chunks are HMAC checked */
5439                                 stcb->asoc.authenticated = 1;
5440                         }
5441                         break;
5442
5443                 default:
5444         unknown_chunk:
5445                         /* it's an unknown chunk! */
5446                         if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
5447                                 struct mbuf *mm;
5448                                 struct sctp_paramhdr *phd;
5449
5450                                 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
5451                                     0, M_DONTWAIT, 1, MT_DATA);
5452                                 if (mm) {
5453                                         phd = mtod(mm, struct sctp_paramhdr *);
5454                                         /*
5455                                          * We cheat and use param type since
5456                                          * we did not bother to define a
5457                                          * error cause struct. They are the
5458                                          * same basic format with different
5459                                          * names.
5460                                          */
5461                                         phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5462                                         phd->param_length = htons(chk_length + sizeof(*phd));
5463                                         SCTP_BUF_LEN(mm) = sizeof(*phd);
5464                                         SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, chk_length, M_DONTWAIT);
5465                                         if (SCTP_BUF_NEXT(mm)) {
5466                                                 if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(mm), SCTP_SIZE32(chk_length) - chk_length, NULL)) {
5467                                                         sctp_m_freem(mm);
5468                                                 } else {
5469 #ifdef SCTP_MBUF_LOGGING
5470                                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5471                                                                 struct mbuf *mat;
5472
5473                                                                 for (mat = SCTP_BUF_NEXT(mm); mat; mat = SCTP_BUF_NEXT(mat)) {
5474                                                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
5475                                                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
5476                                                                         }
5477                                                                 }
5478                                                         }
5479 #endif
5480                                                         sctp_queue_op_err(stcb, mm);
5481                                                 }
5482                                         } else {
5483                                                 sctp_m_freem(mm);
5484                                         }
5485                                 }
5486                         }
5487                         if ((ch->chunk_type & 0x80) == 0) {
5488                                 /* discard this packet */
5489                                 *offset = length;
5490                                 return (stcb);
5491                         }       /* else skip this bad chunk and continue... */
5492                         break;
5493                 }               /* switch (ch->chunk_type) */
5494
5495
5496 next_chunk:
5497                 /* get the next chunk */
5498                 *offset += SCTP_SIZE32(chk_length);
5499                 if (*offset >= length) {
5500                         /* no more data left in the mbuf chain */
5501                         break;
5502                 }
5503                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5504                     sizeof(struct sctp_chunkhdr), chunk_buf);
5505                 if (ch == NULL) {
5506                         if (locked_tcb) {
5507                                 SCTP_TCB_UNLOCK(locked_tcb);
5508                         }
5509                         *offset = length;
5510                         return (NULL);
5511                 }
5512         }                       /* while */
5513
5514         if (asconf_cnt > 0 && stcb != NULL) {
5515                 sctp_send_asconf_ack(stcb);
5516         }
5517         return (stcb);
5518 }
5519
5520
5521 #ifdef INVARIANTS
5522 #ifdef __GNUC__
5523 __attribute__((noinline))
5524 #endif
5525         void
5526              sctp_validate_no_locks(struct sctp_inpcb *inp)
5527 {
5528         struct sctp_tcb *lstcb;
5529
5530         LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) {
5531                 if (mtx_owned(&lstcb->tcb_mtx)) {
5532                         panic("Own lock on stcb at return from input");
5533                 }
5534         }
5535         if (mtx_owned(&inp->inp_create_mtx)) {
5536                 panic("Own create lock on inp");
5537         }
5538         if (mtx_owned(&inp->inp_mtx)) {
5539                 panic("Own inp lock on inp");
5540         }
5541 }
5542
5543 #endif
5544
5545 /*
5546  * common input chunk processing (v4 and v6)
5547  */
5548 void
5549 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset,
5550     int length, struct sctphdr *sh, struct sctp_chunkhdr *ch,
5551     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net,
5552     uint8_t ecn_bits, uint32_t vrf_id, uint16_t port)
5553 {
5554         /*
5555          * Control chunk processing
5556          */
5557         uint32_t high_tsn;
5558         int fwd_tsn_seen = 0, data_processed = 0;
5559         struct mbuf *m = *mm;
5560         int un_sent;
5561         int cnt_ctrl_ready = 0;
5562
5563         SCTP_STAT_INCR(sctps_recvdatagrams);
5564 #ifdef SCTP_AUDITING_ENABLED
5565         sctp_audit_log(0xE0, 1);
5566         sctp_auditing(0, inp, stcb, net);
5567 #endif
5568
5569         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5570             m, iphlen, offset, length, stcb);
5571         if (stcb) {
5572                 /* always clear this before beginning a packet */
5573                 stcb->asoc.authenticated = 0;
5574                 stcb->asoc.seen_a_sack_this_pkt = 0;
5575                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5576                     stcb, stcb->asoc.state);
5577
5578                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5579                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5580                         /*-
5581                          * If we hit here, we had a ref count
5582                          * up when the assoc was aborted and the
5583                          * timer is clearing out the assoc, we should
5584                          * NOT respond to any packet.. its OOTB.
5585                          */
5586                         SCTP_TCB_UNLOCK(stcb);
5587                         sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL,
5588                             vrf_id, port);
5589                         goto out_now;
5590                 }
5591         }
5592         if (IS_SCTP_CONTROL(ch)) {
5593                 /* process the control portion of the SCTP packet */
5594                 /* sa_ignore NO_NULL_CHK */
5595                 stcb = sctp_process_control(m, iphlen, &offset, length, sh, ch,
5596                     inp, stcb, &net, &fwd_tsn_seen, vrf_id, port);
5597                 if (stcb) {
5598                         /*
5599                          * This covers us if the cookie-echo was there and
5600                          * it changes our INP.
5601                          */
5602                         inp = stcb->sctp_ep;
5603                         if ((net) && (port)) {
5604                                 if (net->port == 0) {
5605                                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5606                                 }
5607                                 net->port = port;
5608                         }
5609                 }
5610         } else {
5611                 /*
5612                  * no control chunks, so pre-process DATA chunks (these
5613                  * checks are taken care of by control processing)
5614                  */
5615
5616                 /*
5617                  * if DATA only packet, and auth is required, then punt...
5618                  * can't have authenticated without any AUTH (control)
5619                  * chunks
5620                  */
5621                 if ((stcb != NULL) &&
5622                     !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
5623                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5624                         /* "silently" ignore */
5625                         SCTP_STAT_INCR(sctps_recvauthmissing);
5626                         SCTP_TCB_UNLOCK(stcb);
5627                         goto out_now;
5628                 }
5629                 if (stcb == NULL) {
5630                         /* out of the blue DATA chunk */
5631                         sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL,
5632                             vrf_id, port);
5633                         goto out_now;
5634                 }
5635                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5636                         /* v_tag mismatch! */
5637                         SCTP_STAT_INCR(sctps_badvtag);
5638                         SCTP_TCB_UNLOCK(stcb);
5639                         goto out_now;
5640                 }
5641         }
5642
5643         if (stcb == NULL) {
5644                 /*
5645                  * no valid TCB for this packet, or we found it's a bad
5646                  * packet while processing control, or we're done with this
5647                  * packet (done or skip rest of data), so we drop it...
5648                  */
5649                 goto out_now;
5650         }
5651         /*
5652          * DATA chunk processing
5653          */
5654         /* plow through the data chunks while length > offset */
5655
5656         /*
5657          * Rest should be DATA only.  Check authentication state if AUTH for
5658          * DATA is required.
5659          */
5660         if ((length > offset) &&
5661             (stcb != NULL) &&
5662             !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
5663             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5664             !stcb->asoc.authenticated) {
5665                 /* "silently" ignore */
5666                 SCTP_STAT_INCR(sctps_recvauthmissing);
5667                 SCTPDBG(SCTP_DEBUG_AUTH1,
5668                     "Data chunk requires AUTH, skipped\n");
5669                 goto trigger_send;
5670         }
5671         if (length > offset) {
5672                 int retval;
5673
5674                 /*
5675                  * First check to make sure our state is correct. We would
5676                  * not get here unless we really did have a tag, so we don't
5677                  * abort if this happens, just dump the chunk silently.
5678                  */
5679                 switch (SCTP_GET_STATE(&stcb->asoc)) {
5680                 case SCTP_STATE_COOKIE_ECHOED:
5681                         /*
5682                          * we consider data with valid tags in this state
5683                          * shows us the cookie-ack was lost. Imply it was
5684                          * there.
5685                          */
5686                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5687                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5688                                     stcb->asoc.overall_error_count,
5689                                     0,
5690                                     SCTP_FROM_SCTP_INPUT,
5691                                     __LINE__);
5692                         }
5693                         stcb->asoc.overall_error_count = 0;
5694                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5695                         break;
5696                 case SCTP_STATE_COOKIE_WAIT:
5697                         /*
5698                          * We consider OOTB any data sent during asoc setup.
5699                          */
5700                         sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL,
5701                             vrf_id, port);
5702                         SCTP_TCB_UNLOCK(stcb);
5703                         goto out_now;
5704                         /* sa_ignore NOTREACHED */
5705                         break;
5706                 case SCTP_STATE_EMPTY:  /* should not happen */
5707                 case SCTP_STATE_INUSE:  /* should not happen */
5708                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5709                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5710                 default:
5711                         SCTP_TCB_UNLOCK(stcb);
5712                         goto out_now;
5713                         /* sa_ignore NOTREACHED */
5714                         break;
5715                 case SCTP_STATE_OPEN:
5716                 case SCTP_STATE_SHUTDOWN_SENT:
5717                         break;
5718                 }
5719                 /* plow through the data chunks while length > offset */
5720                 retval = sctp_process_data(mm, iphlen, &offset, length, sh,
5721                     inp, stcb, net, &high_tsn);
5722                 if (retval == 2) {
5723                         /*
5724                          * The association aborted, NO UNLOCK needed since
5725                          * the association is destroyed.
5726                          */
5727                         goto out_now;
5728                 }
5729                 data_processed = 1;
5730                 /*
5731                  * Anything important needs to have been m_copy'ed in
5732                  * process_data
5733                  */
5734         }
5735         /* take care of ecn */
5736         if ((data_processed == 1) &&
5737             (stcb->asoc.ecn_allowed == 1) &&
5738             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5739                 /* Yep, we need to add a ECNE */
5740                 sctp_send_ecn_echo(stcb, net, high_tsn);
5741         }
5742         if ((data_processed == 0) && (fwd_tsn_seen)) {
5743                 int was_a_gap;
5744                 uint32_t highest_tsn;
5745
5746                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
5747                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
5748                 } else {
5749                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
5750                 }
5751                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
5752                 stcb->asoc.send_sack = 1;
5753                 sctp_sack_check(stcb, was_a_gap);
5754         } else if (fwd_tsn_seen) {
5755                 stcb->asoc.send_sack = 1;
5756         }
5757         /* trigger send of any chunks in queue... */
5758 trigger_send:
5759 #ifdef SCTP_AUDITING_ENABLED
5760         sctp_audit_log(0xE0, 2);
5761         sctp_auditing(1, inp, stcb, net);
5762 #endif
5763         SCTPDBG(SCTP_DEBUG_INPUT1,
5764             "Check for chunk output prw:%d tqe:%d tf=%d\n",
5765             stcb->asoc.peers_rwnd,
5766             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
5767             stcb->asoc.total_flight);
5768         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
5769         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
5770                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
5771         }
5772         if (cnt_ctrl_ready ||
5773             ((un_sent) &&
5774             (stcb->asoc.peers_rwnd > 0 ||
5775             (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
5776                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
5777                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5778                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
5779         }
5780 #ifdef SCTP_AUDITING_ENABLED
5781         sctp_audit_log(0xE0, 3);
5782         sctp_auditing(2, inp, stcb, net);
5783 #endif
5784         SCTP_TCB_UNLOCK(stcb);
5785 out_now:
5786 #ifdef INVARIANTS
5787         sctp_validate_no_locks(inp);
5788 #endif
5789         return;
5790 }
5791
5792 #if 0
5793 static void
5794 sctp_print_mbuf_chain(struct mbuf *m)
5795 {
5796         for (; m; m = SCTP_BUF_NEXT(m)) {
5797                 SCTP_PRINTF("%p: m_len = %ld\n", m, SCTP_BUF_LEN(m));
5798                 if (SCTP_BUF_IS_EXTENDED(m))
5799                         SCTP_PRINTF("%p: extend_size = %d\n", m, SCTP_BUF_EXTEND_SIZE(m));
5800         }
5801 }
5802
5803 #endif
5804
5805 #ifdef INET
5806 void
5807 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
5808 {
5809         struct mbuf *m;
5810         int iphlen;
5811         uint32_t vrf_id = 0;
5812         uint8_t ecn_bits;
5813         struct ip *ip;
5814         struct sctphdr *sh;
5815         struct sctp_inpcb *inp = NULL;
5816         struct sctp_nets *net;
5817         struct sctp_tcb *stcb = NULL;
5818         struct sctp_chunkhdr *ch;
5819         int refcount_up = 0;
5820         int length, mlen, offset;
5821
5822 #if !defined(SCTP_WITH_NO_CSUM)
5823         uint32_t check, calc_check;
5824
5825 #endif
5826
5827         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
5828                 SCTP_RELEASE_PKT(i_pak);
5829                 return;
5830         }
5831         mlen = SCTP_HEADER_LEN(i_pak);
5832         iphlen = off;
5833         m = SCTP_HEADER_TO_CHAIN(i_pak);
5834
5835         net = NULL;
5836         SCTP_STAT_INCR(sctps_recvpackets);
5837         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
5838
5839
5840 #ifdef SCTP_MBUF_LOGGING
5841         /* Log in any input mbufs */
5842         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5843                 struct mbuf *mat;
5844
5845                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
5846                         if (SCTP_BUF_IS_EXTENDED(mat)) {
5847                                 sctp_log_mb(mat, SCTP_MBUF_INPUT);
5848                         }
5849                 }
5850         }
5851 #endif
5852 #ifdef  SCTP_PACKET_LOGGING
5853         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
5854                 sctp_packet_log(m, mlen);
5855 #endif
5856         /*
5857          * Must take out the iphlen, since mlen expects this (only effect lb
5858          * case)
5859          */
5860         mlen -= iphlen;
5861
5862         /*
5863          * Get IP, SCTP, and first chunk header together in first mbuf.
5864          */
5865         ip = mtod(m, struct ip *);
5866         offset = iphlen + sizeof(*sh) + sizeof(*ch);
5867         if (SCTP_BUF_LEN(m) < offset) {
5868                 if ((m = m_pullup(m, offset)) == 0) {
5869                         SCTP_STAT_INCR(sctps_hdrops);
5870                         return;
5871                 }
5872                 ip = mtod(m, struct ip *);
5873         }
5874         /* validate mbuf chain length with IP payload length */
5875         if (mlen < (SCTP_GET_IPV4_LENGTH(ip) - iphlen)) {
5876                 SCTP_STAT_INCR(sctps_hdrops);
5877                 goto bad;
5878         }
5879         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
5880         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(*sh));
5881         SCTPDBG(SCTP_DEBUG_INPUT1,
5882             "sctp_input() length:%d iphlen:%d\n", mlen, iphlen);
5883
5884         /* SCTP does not allow broadcasts or multicasts */
5885         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
5886                 goto bad;
5887         }
5888         if (SCTP_IS_IT_BROADCAST(ip->ip_dst, m)) {
5889                 /*
5890                  * We only look at broadcast if its a front state, All
5891                  * others we will not have a tcb for anyway.
5892                  */
5893                 goto bad;
5894         }
5895         /* validate SCTP checksum */
5896         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
5897             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n",
5898             m->m_pkthdr.len,
5899             if_name(m->m_pkthdr.rcvif),
5900             m->m_pkthdr.csum_flags);
5901 #if defined(SCTP_WITH_NO_CSUM)
5902         SCTP_STAT_INCR(sctps_recvnocrc);
5903 #else
5904         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
5905                 SCTP_STAT_INCR(sctps_recvhwcrc);
5906                 goto sctp_skip_csum_4;
5907         }
5908         check = sh->checksum;   /* save incoming checksum */
5909         sh->checksum = 0;       /* prepare for calc */
5910         calc_check = sctp_calculate_cksum(m, iphlen);
5911         sh->checksum = check;
5912         SCTP_STAT_INCR(sctps_recvswcrc);
5913         if (calc_check != check) {
5914                 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5915                     calc_check, check, m, mlen, iphlen);
5916
5917                 stcb = sctp_findassociation_addr(m,
5918                     offset - sizeof(*ch),
5919                     sh, ch, &inp, &net,
5920                     vrf_id);
5921                 if ((net) && (port)) {
5922                         if (net->port == 0) {
5923                                 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5924                         }
5925                         net->port = port;
5926                 }
5927                 if ((net != NULL) && (m->m_flags & M_FLOWID)) {
5928                         net->flowid = m->m_pkthdr.flowid;
5929 #ifdef INVARIANTS
5930                         net->flowidset = 1;
5931 #endif
5932                 }
5933                 if ((inp) && (stcb)) {
5934                         sctp_send_packet_dropped(stcb, net, m, iphlen, 1);
5935                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5936                 } else if ((inp != NULL) && (stcb == NULL)) {
5937                         refcount_up = 1;
5938                 }
5939                 SCTP_STAT_INCR(sctps_badsum);
5940                 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5941                 goto bad;
5942         }
5943 sctp_skip_csum_4:
5944 #endif
5945         /* destination port of 0 is illegal, based on RFC2960. */
5946         if (sh->dest_port == 0) {
5947                 SCTP_STAT_INCR(sctps_hdrops);
5948                 goto bad;
5949         }
5950         /*
5951          * Locate pcb and tcb for datagram sctp_findassociation_addr() wants
5952          * IP/SCTP/first chunk header...
5953          */
5954         stcb = sctp_findassociation_addr(m, offset - sizeof(*ch),
5955             sh, ch, &inp, &net, vrf_id);
5956         if ((net) && (port)) {
5957                 if (net->port == 0) {
5958                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5959                 }
5960                 net->port = port;
5961         }
5962         if ((net != NULL) && (m->m_flags & M_FLOWID)) {
5963                 net->flowid = m->m_pkthdr.flowid;
5964 #ifdef INVARIANTS
5965                 net->flowidset = 1;
5966 #endif
5967         }
5968         /* inp's ref-count increased && stcb locked */
5969         if (inp == NULL) {
5970                 struct sctp_init_chunk *init_chk, chunk_buf;
5971
5972                 SCTP_STAT_INCR(sctps_noport);
5973 #ifdef ICMP_BANDLIM
5974                 /*
5975                  * we use the bandwidth limiting to protect against sending
5976                  * too many ABORTS all at once. In this case these count the
5977                  * same as an ICMP message.
5978                  */
5979                 if (badport_bandlim(0) < 0)
5980                         goto bad;
5981 #endif                          /* ICMP_BANDLIM */
5982                 SCTPDBG(SCTP_DEBUG_INPUT1,
5983                     "Sending a ABORT from packet entry!\n");
5984                 if (ch->chunk_type == SCTP_INITIATION) {
5985                         /*
5986                          * we do a trick here to get the INIT tag, dig in
5987                          * and get the tag from the INIT and put it in the
5988                          * common header.
5989                          */
5990                         init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m,
5991                             iphlen + sizeof(*sh), sizeof(*init_chk),
5992                             (uint8_t *) & chunk_buf);
5993                         if (init_chk != NULL)
5994                                 sh->v_tag = init_chk->init.initiate_tag;
5995                 }
5996                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5997                         sctp_send_shutdown_complete2(m, sh, vrf_id, port);
5998                         goto bad;
5999                 }
6000                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
6001                         goto bad;
6002                 }
6003                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
6004                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
6005                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
6006                             (ch->chunk_type != SCTP_INIT))) {
6007                                 sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port);
6008                         }
6009                 }
6010                 goto bad;
6011         } else if (stcb == NULL) {
6012                 refcount_up = 1;
6013         }
6014 #ifdef IPSEC
6015         /*
6016          * I very much doubt any of the IPSEC stuff will work but I have no
6017          * idea, so I will leave it in place.
6018          */
6019         if (inp && ipsec4_in_reject(m, &inp->ip_inp.inp)) {
6020                 MODULE_GLOBAL(ipsec4stat).in_polvio++;
6021                 SCTP_STAT_INCR(sctps_hdrops);
6022                 goto bad;
6023         }
6024 #endif                          /* IPSEC */
6025
6026         /*
6027          * common chunk processing
6028          */
6029         length = ip->ip_len + iphlen;
6030         offset -= sizeof(struct sctp_chunkhdr);
6031
6032         ecn_bits = ip->ip_tos;
6033
6034         /* sa_ignore NO_NULL_CHK */
6035         sctp_common_input_processing(&m, iphlen, offset, length, sh, ch,
6036             inp, stcb, net, ecn_bits, vrf_id, port);
6037         /* inp's ref-count reduced && stcb unlocked */
6038         if (m) {
6039                 sctp_m_freem(m);
6040         }
6041         if ((inp) && (refcount_up)) {
6042                 /* reduce ref-count */
6043                 SCTP_INP_DECR_REF(inp);
6044         }
6045         return;
6046 bad:
6047         if (stcb) {
6048                 SCTP_TCB_UNLOCK(stcb);
6049         }
6050         if ((inp) && (refcount_up)) {
6051                 /* reduce ref-count */
6052                 SCTP_INP_DECR_REF(inp);
6053         }
6054         if (m) {
6055                 sctp_m_freem(m);
6056         }
6057         return;
6058 }
6059
6060 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6061 extern int *sctp_cpuarry;
6062
6063 #endif
6064
6065 void
6066 sctp_input(struct mbuf *m, int off)
6067 {
6068 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6069         struct ip *ip;
6070         struct sctphdr *sh;
6071         int offset;
6072         int cpu_to_use;
6073         uint32_t flowid, tag;
6074
6075         if (mp_ncpus > 1) {
6076                 if (m->m_flags & M_FLOWID) {
6077                         flowid = m->m_pkthdr.flowid;
6078                 } else {
6079                         /*
6080                          * No flow id built by lower layers fix it so we
6081                          * create one.
6082                          */
6083                         ip = mtod(m, struct ip *);
6084                         offset = off + sizeof(*sh);
6085                         if (SCTP_BUF_LEN(m) < offset) {
6086                                 if ((m = m_pullup(m, offset)) == 0) {
6087                                         SCTP_STAT_INCR(sctps_hdrops);
6088                                         return;
6089                                 }
6090                                 ip = mtod(m, struct ip *);
6091                         }
6092                         sh = (struct sctphdr *)((caddr_t)ip + off);
6093                         tag = htonl(sh->v_tag);
6094                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
6095                         m->m_pkthdr.flowid = flowid;
6096                         m->m_flags |= M_FLOWID;
6097                 }
6098                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
6099                 sctp_queue_to_mcore(m, off, cpu_to_use);
6100                 return;
6101         }
6102 #endif
6103         sctp_input_with_port(m, off, 0);
6104 }
6105
6106 #endif