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     struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id, uint16_t port)
  88 {
  89         struct sctp_init *init;
  90         struct mbuf *op_err;
  91         uint32_t init_limit;
  92
  93         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
  94             stcb);
  95         if (stcb == NULL) {
  96                 SCTP_INP_RLOCK(inp);
  97                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
  98                         goto outnow;
  99                 }
 100         }
 101         op_err = NULL;
 102         init = &cp->init;
 103         /* First are we accepting? */
 104         if ((inp->sctp_socket->so_qlimit == 0) && (stcb == NULL)) {
 105                 SCTPDBG(SCTP_DEBUG_INPUT2,
 106                     "sctp_handle_init: Abort, so_qlimit:%d\n",
 107                     inp->sctp_socket->so_qlimit);
 108                 /*
 109                  * FIX ME ?? What about TCP model and we have a
 110                  * match/restart case? Actually no fix is needed. the lookup
 111                  * will always find the existing assoc so stcb would not be
 112                  * NULL. It may be questionable to do this since we COULD
 113                  * just send back the INIT-ACK and hope that the app did
 114                  * accept()'s by the time the COOKIE was sent. But there is
 115                  * a price to pay for COOKIE generation and I don't want to
 116                  * pay it on the chance that the app will actually do some
 117                  * accepts(). The App just looses and should NOT be in this
 118                  * state :-)
 119                  */
 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 (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) {
 127                 /* Invalid length */
 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         /* validate parameters */
 136         if (init->initiate_tag == 0) {
 137                 /* protocol error... send abort */
 138                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 139                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
 140                     vrf_id, port);
 141                 if (stcb)
 142                         *abort_no_unlock = 1;
 143                 goto outnow;
 144         }
 145         if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) {
 146                 /* invalid parameter... send abort */
 147                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 148                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
 149                     vrf_id, port);
 150                 if (stcb)
 151                         *abort_no_unlock = 1;
 152                 goto outnow;
 153         }
 154         if (init->num_inbound_streams == 0) {
 155                 /* protocol error... send abort */
 156                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 157                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
 158                     vrf_id, port);
 159                 if (stcb)
 160                         *abort_no_unlock = 1;
 161                 goto outnow;
 162         }
 163         if (init->num_outbound_streams == 0) {
 164                 /* protocol error... send abort */
 165                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 166                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
 167                     vrf_id, port);
 168                 if (stcb)
 169                         *abort_no_unlock = 1;
 170                 goto outnow;
 171         }
 172         init_limit = offset + ntohs(cp->ch.chunk_length);
 173         if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
 174             init_limit)) {
 175                 /* auth parameter(s) error... send abort */
 176                 sctp_abort_association(inp, stcb, m, iphlen, sh, NULL, vrf_id, port);
 177                 if (stcb)
 178                         *abort_no_unlock = 1;
 179                 goto outnow;
 180         }
 181         /* send an INIT-ACK w/cookie */
 182         SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
 183         sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, sh, cp, vrf_id, port,
 184             ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED));
 185 outnow:
 186         if (stcb == NULL) {
 187                 SCTP_INP_RUNLOCK(inp);
 188         }
 189 }
 190
 191 /*
 192  * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
 193  */
 194
 195 int
 196 sctp_is_there_unsent_data(struct sctp_tcb *stcb)
 197 {
 198         int unsent_data = 0;
 199         unsigned int i;
 200         struct sctp_stream_queue_pending *sp;
 201         struct sctp_association *asoc;
 202
 203         /*
 204          * This function returns the number of streams that have true unsent
 205          * data on them. Note that as it looks through it will clean up any
 206          * places that have old data that has been sent but left at top of
 207          * stream queue.
 208          */
 209         asoc = &stcb->asoc;
 210         SCTP_TCB_SEND_LOCK(stcb);
 211         if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
 212                 /* Check to see if some data queued */
 213                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 214                         /* sa_ignore FREED_MEMORY */
 215                         sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
 216                         if (sp == NULL) {
 217                                 continue;
 218                         }
 219                         if ((sp->msg_is_complete) &&
 220                             (sp->length == 0) &&
 221                             (sp->sender_all_done)) {
 222                                 /*
 223                                  * We are doing differed cleanup. Last time
 224                                  * through when we took all the data the
 225                                  * sender_all_done was not set.
 226                                  */
 227                                 if (sp->put_last_out == 0) {
 228                                         SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
 229                                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
 230                                             sp->sender_all_done,
 231                                             sp->length,
 232                                             sp->msg_is_complete,
 233                                             sp->put_last_out);
 234                                 }
 235                                 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 236                                 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
 237                                 if (sp->net) {
 238                                         sctp_free_remote_addr(sp->net);
 239                                         sp->net = NULL;
 240                                 }
 241                                 if (sp->data) {
 242                                         sctp_m_freem(sp->data);
 243                                         sp->data = NULL;
 244                                 }
 245                                 sctp_free_a_strmoq(stcb, sp);
 246                         } else {
 247                                 unsent_data++;
 248                                 break;
 249                         }
 250                 }
 251         }
 252         SCTP_TCB_SEND_UNLOCK(stcb);
 253         return (unsent_data);
 254 }
 255
 256 static int
 257 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb,
 258     struct sctp_nets *net)
 259 {
 260         struct sctp_init *init;
 261         struct sctp_association *asoc;
 262         struct sctp_nets *lnet;
 263         unsigned int i;
 264
 265         init = &cp->init;
 266         asoc = &stcb->asoc;
 267         /* save off parameters */
 268         asoc->peer_vtag = ntohl(init->initiate_tag);
 269         asoc->peers_rwnd = ntohl(init->a_rwnd);
 270         /* init tsn's */
 271         asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
 272
 273         if (!TAILQ_EMPTY(&asoc->nets)) {
 274                 /* update any ssthresh's that may have a default */
 275                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
 276                         lnet->ssthresh = asoc->peers_rwnd;
 277                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
 278                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
 279                         }
 280                 }
 281         }
 282         SCTP_TCB_SEND_LOCK(stcb);
 283         if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
 284                 unsigned int newcnt;
 285                 struct sctp_stream_out *outs;
 286                 struct sctp_stream_queue_pending *sp, *nsp;
 287                 struct sctp_tmit_chunk *chk, *nchk;
 288
 289                 /* abandon the upper streams */
 290                 newcnt = ntohs(init->num_inbound_streams);
 291                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
 292                         if (chk->rec.data.stream_number >= newcnt) {
 293                                 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
 294                                 asoc->send_queue_cnt--;
 295                                 if (chk->data != NULL) {
 296                                         sctp_free_bufspace(stcb, asoc, chk, 1);
 297                                         sctp_ulp_notify(SCTP_NOTIFY_DG_FAIL, stcb,
 298                                             SCTP_NOTIFY_DATAGRAM_UNSENT, chk, SCTP_SO_NOT_LOCKED);
 299                                         if (chk->data) {
 300                                                 sctp_m_freem(chk->data);
 301                                                 chk->data = NULL;
 302                                         }
 303                                 }
 304                                 sctp_free_a_chunk(stcb, chk);
 305                                 /* sa_ignore FREED_MEMORY */
 306                         }
 307                 }
 308                 if (asoc->strmout) {
 309                         for (i = newcnt; i < asoc->pre_open_streams; i++) {
 310                                 outs = &asoc->strmout[i];
 311                                 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
 312                                         TAILQ_REMOVE(&outs->outqueue, sp, next);
 313                                         asoc->stream_queue_cnt--;
 314                                         sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
 315                                             stcb, SCTP_NOTIFY_DATAGRAM_UNSENT,
 316                                             sp, SCTP_SO_NOT_LOCKED);
 317                                         if (sp->data) {
 318                                                 sctp_m_freem(sp->data);
 319                                                 sp->data = NULL;
 320                                         }
 321                                         if (sp->net) {
 322                                                 sctp_free_remote_addr(sp->net);
 323                                                 sp->net = NULL;
 324                                         }
 325                                         /* Free the chunk */
 326                                         sctp_free_a_strmoq(stcb, sp);
 327                                         /* sa_ignore FREED_MEMORY */
 328                                 }
 329                         }
 330                 }
 331                 /* cut back the count */
 332                 asoc->pre_open_streams = newcnt;
 333         }
 334         SCTP_TCB_SEND_UNLOCK(stcb);
 335         asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams;
 336
 337         /* EY - nr_sack: initialize highest tsn in nr_mapping_array */
 338         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
 339         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
 340                 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 341         }
 342         /* This is the next one we expect */
 343         asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
 344
 345         asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
 346         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
 347
 348         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
 349         /* open the requested streams */
 350
 351         if (asoc->strmin != NULL) {
 352                 /* Free the old ones */
 353                 struct sctp_queued_to_read *ctl, *nctl;
 354
 355                 for (i = 0; i < asoc->streamincnt; i++) {
 356                         TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) {
 357                                 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next);
 358                                 sctp_free_remote_addr(ctl->whoFrom);
 359                                 ctl->whoFrom = NULL;
 360                                 sctp_m_freem(ctl->data);
 361                                 ctl->data = NULL;
 362                                 sctp_free_a_readq(stcb, ctl);
 363                         }
 364                 }
 365                 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
 366         }
 367         asoc->streamincnt = ntohs(init->num_outbound_streams);
 368         if (asoc->streamincnt > MAX_SCTP_STREAMS) {
 369                 asoc->streamincnt = MAX_SCTP_STREAMS;
 370         }
 371         SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
 372             sizeof(struct sctp_stream_in), SCTP_M_STRMI);
 373         if (asoc->strmin == NULL) {
 374                 /* we didn't get memory for the streams! */
 375                 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
 376                 return (-1);
 377         }
 378         for (i = 0; i < asoc->streamincnt; i++) {
 379                 asoc->strmin[i].stream_no = i;
 380                 asoc->strmin[i].last_sequence_delivered = 0xffff;
 381                 /*
 382                  * U-stream ranges will be set when the cookie is unpacked.
 383                  * Or for the INIT sender they are un set (if pr-sctp not
 384                  * supported) when the INIT-ACK arrives.
 385                  */
 386                 TAILQ_INIT(&asoc->strmin[i].inqueue);
 387                 asoc->strmin[i].delivery_started = 0;
 388         }
 389         /*
 390          * load_address_from_init will put the addresses into the
 391          * association when the COOKIE is processed or the INIT-ACK is
 392          * processed. Both types of COOKIE's existing and new call this
 393          * routine. It will remove addresses that are no longer in the
 394          * association (for the restarting case where addresses are
 395          * removed). Up front when the INIT arrives we will discard it if it
 396          * is a restart and new addresses have been added.
 397          */
 398         /* sa_ignore MEMLEAK */
 399         return (0);
 400 }
 401
 402 /*
 403  * INIT-ACK message processing/consumption returns value < 0 on error
 404  */
 405 static int
 406 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
 407     struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
 408     struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id)
 409 {
 410         struct sctp_association *asoc;
 411         struct mbuf *op_err;
 412         int retval, abort_flag;
 413         uint32_t initack_limit;
 414         int nat_friendly = 0;
 415
 416         /* First verify that we have no illegal param's */
 417         abort_flag = 0;
 418         op_err = NULL;
 419
 420         op_err = sctp_arethere_unrecognized_parameters(m,
 421             (offset + sizeof(struct sctp_init_chunk)),
 422             &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly);
 423         if (abort_flag) {
 424                 /* Send an abort and notify peer */
 425                 sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_CAUSE_PROTOCOL_VIOLATION, op_err, SCTP_SO_NOT_LOCKED);
 426                 *abort_no_unlock = 1;
 427                 return (-1);
 428         }
 429         asoc = &stcb->asoc;
 430         asoc->peer_supports_nat = (uint8_t) nat_friendly;
 431         /* process the peer's parameters in the INIT-ACK */
 432         retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb, net);
 433         if (retval < 0) {
 434                 return (retval);
 435         }
 436         initack_limit = offset + ntohs(cp->ch.chunk_length);
 437         /* load all addresses */
 438         if ((retval = sctp_load_addresses_from_init(stcb, m, iphlen,
 439             (offset + sizeof(struct sctp_init_chunk)), initack_limit, sh,
 440             NULL))) {
 441                 /* Huh, we should abort */
 442                 SCTPDBG(SCTP_DEBUG_INPUT1,
 443                     "Load addresses from INIT causes an abort %d\n",
 444                     retval);
 445                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
 446                     NULL, 0, net->port);
 447                 *abort_no_unlock = 1;
 448                 return (-1);
 449         }
 450         /* if the peer doesn't support asconf, flush the asconf queue */
 451         if (asoc->peer_supports_asconf == 0) {
 452                 struct sctp_asconf_addr *param, *nparam;
 453
 454                 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
 455                         TAILQ_REMOVE(&asoc->asconf_queue, param, next);
 456                         SCTP_FREE(param, SCTP_M_ASC_ADDR);
 457                 }
 458         }
 459         stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
 460             stcb->asoc.local_hmacs);
 461         if (op_err) {
 462                 sctp_queue_op_err(stcb, op_err);
 463                 /* queuing will steal away the mbuf chain to the out queue */
 464                 op_err = NULL;
 465         }
 466         /* extract the cookie and queue it to "echo" it back... */
 467         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 468                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 469                     stcb->asoc.overall_error_count,
 470                     0,
 471                     SCTP_FROM_SCTP_INPUT,
 472                     __LINE__);
 473         }
 474         stcb->asoc.overall_error_count = 0;
 475         net->error_count = 0;
 476
 477         /*
 478          * Cancel the INIT timer, We do this first before queueing the
 479          * cookie. We always cancel at the primary to assue that we are
 480          * canceling the timer started by the INIT which always goes to the
 481          * primary.
 482          */
 483         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
 484             asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
 485
 486         /* calculate the RTO */
 487         net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy,
 488             SCTP_DETERMINE_LL_NOTOK);
 489
 490         retval = sctp_send_cookie_echo(m, offset, stcb, net);
 491         if (retval < 0) {
 492                 /*
 493                  * No cookie, we probably should send a op error. But in any
 494                  * case if there is no cookie in the INIT-ACK, we can
 495                  * abandon the peer, its broke.
 496                  */
 497                 if (retval == -3) {
 498                         /* We abort with an error of missing mandatory param */
 499                         op_err =
 500                             sctp_generate_invmanparam(SCTP_CAUSE_MISSING_PARAM);
 501                         if (op_err) {
 502                                 /*
 503                                  * Expand beyond to include the mandatory
 504                                  * param cookie
 505                                  */
 506                                 struct sctp_inv_mandatory_param *mp;
 507
 508                                 SCTP_BUF_LEN(op_err) =
 509                                     sizeof(struct sctp_inv_mandatory_param);
 510                                 mp = mtod(op_err,
 511                                     struct sctp_inv_mandatory_param *);
 512                                 /* Subtract the reserved param */
 513                                 mp->length =
 514                                     htons(sizeof(struct sctp_inv_mandatory_param) - 2);
 515                                 mp->num_param = htonl(1);
 516                                 mp->param = htons(SCTP_STATE_COOKIE);
 517                                 mp->resv = 0;
 518                         }
 519                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 520                             sh, op_err, 0, net->port);
 521                         *abort_no_unlock = 1;
 522                 }
 523                 return (retval);
 524         }
 525         return (0);
 526 }
 527
 528 static void
 529 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
 530     struct sctp_tcb *stcb, struct sctp_nets *net)
 531 {
 532         struct sockaddr_storage store;
 533         struct sockaddr_in *sin;
 534         struct sockaddr_in6 *sin6;
 535         struct sctp_nets *r_net, *f_net;
 536         struct timeval tv;
 537         int req_prim = 0;
 538
 539         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
 540                 /* Invalid length */
 541                 return;
 542         }
 543         sin = (struct sockaddr_in *)&store;
 544         sin6 = (struct sockaddr_in6 *)&store;
 545
 546         memset(&store, 0, sizeof(store));
 547         if (cp->heartbeat.hb_info.addr_family == AF_INET &&
 548             cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
 549                 sin->sin_family = cp->heartbeat.hb_info.addr_family;
 550                 sin->sin_len = cp->heartbeat.hb_info.addr_len;
 551                 sin->sin_port = stcb->rport;
 552                 memcpy(&sin->sin_addr, cp->heartbeat.hb_info.address,
 553                     sizeof(sin->sin_addr));
 554         } else if (cp->heartbeat.hb_info.addr_family == AF_INET6 &&
 555             cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
 556                 sin6->sin6_family = cp->heartbeat.hb_info.addr_family;
 557                 sin6->sin6_len = cp->heartbeat.hb_info.addr_len;
 558                 sin6->sin6_port = stcb->rport;
 559                 memcpy(&sin6->sin6_addr, cp->heartbeat.hb_info.address,
 560                     sizeof(sin6->sin6_addr));
 561         } else {
 562                 return;
 563         }
 564         r_net = sctp_findnet(stcb, (struct sockaddr *)sin);
 565         if (r_net == NULL) {
 566                 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
 567                 return;
 568         }
 569         if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 570             (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
 571             (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
 572                 /*
 573                  * If the its a HB and it's random value is correct when can
 574                  * confirm the destination.
 575                  */
 576                 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 577                 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
 578                         stcb->asoc.primary_destination = r_net;
 579                         r_net->dest_state &= ~SCTP_ADDR_WAS_PRIMARY;
 580                         r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
 581                         f_net = TAILQ_FIRST(&stcb->asoc.nets);
 582                         if (f_net != r_net) {
 583                                 /*
 584                                  * first one on the list is NOT the primary
 585                                  * sctp_cmpaddr() is much more efficent if
 586                                  * the primary is the first on the list,
 587                                  * make it so.
 588                                  */
 589                                 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
 590                                 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
 591                         }
 592                         req_prim = 1;
 593                 }
 594                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 595                     stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 596         }
 597         r_net->error_count = 0;
 598         r_net->hb_responded = 1;
 599         tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
 600         tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
 601         if (r_net->dest_state & SCTP_ADDR_NOT_REACHABLE) {
 602                 r_net->dest_state &= ~SCTP_ADDR_NOT_REACHABLE;
 603                 r_net->dest_state |= SCTP_ADDR_REACHABLE;
 604                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
 605                     SCTP_HEARTBEAT_SUCCESS, (void *)r_net, SCTP_SO_NOT_LOCKED);
 606                 /* now was it the primary? if so restore */
 607                 if (r_net->dest_state & SCTP_ADDR_WAS_PRIMARY) {
 608                         (void)sctp_set_primary_addr(stcb, (struct sockaddr *)NULL, r_net);
 609                 }
 610         }
 611         /*
 612          * JRS 5/14/07 - If CMT PF is on and the destination is in PF state,
 613          * set the destination to active state and set the cwnd to one or
 614          * two MTU's based on whether PF1 or PF2 is being used. If a T3
 615          * timer is running, for the destination, stop the timer because a
 616          * PF-heartbeat was received.
 617          */
 618         if ((stcb->asoc.sctp_cmt_on_off > 0) &&
 619             (stcb->asoc.sctp_cmt_pf > 0) &&
 620             ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF)) {
 621                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
 622                         sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
 623                             stcb, net,
 624                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_5);
 625                 }
 626                 net->dest_state &= ~SCTP_ADDR_PF;
 627                 net->cwnd = net->mtu * stcb->asoc.sctp_cmt_pf;
 628                 SCTPDBG(SCTP_DEBUG_INPUT1, "Destination %p moved from PF to reachable with cwnd %d.\n",
 629                     net, net->cwnd);
 630         }
 631         /* Now lets do a RTO with this */
 632         r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy,
 633             SCTP_DETERMINE_LL_OK);
 634         /* Mobility adaptation */
 635         if (req_prim) {
 636                 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
 637                     SCTP_MOBILITY_BASE) ||
 638                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 639                     SCTP_MOBILITY_FASTHANDOFF)) &&
 640                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 641                     SCTP_MOBILITY_PRIM_DELETED)) {
 642
 643                         sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7);
 644                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 645                             SCTP_MOBILITY_FASTHANDOFF)) {
 646                                 sctp_assoc_immediate_retrans(stcb,
 647                                     stcb->asoc.primary_destination);
 648                         }
 649                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 650                             SCTP_MOBILITY_BASE)) {
 651                                 sctp_move_chunks_from_net(stcb,
 652                                     stcb->asoc.deleted_primary);
 653                         }
 654                         sctp_delete_prim_timer(stcb->sctp_ep, stcb,
 655                             stcb->asoc.deleted_primary);
 656                 }
 657         }
 658 }
 659
 660 static int
 661 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
 662 {
 663         /*
 664          * return 0 means we want you to proceed with the abort non-zero
 665          * means no abort processing
 666          */
 667         struct sctpasochead *head;
 668
 669         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) {
 670                 /* generate a new vtag and send init */
 671                 LIST_REMOVE(stcb, sctp_asocs);
 672                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 673                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 674                 /*
 675                  * put it in the bucket in the vtag hash of assoc's for the
 676                  * system
 677                  */
 678                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 679                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 680                 return (1);
 681         }
 682         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
 683                 /*
 684                  * treat like a case where the cookie expired i.e.: - dump
 685                  * current cookie. - generate a new vtag. - resend init.
 686                  */
 687                 /* generate a new vtag and send init */
 688                 LIST_REMOVE(stcb, sctp_asocs);
 689                 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED;
 690                 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT;
 691                 sctp_stop_all_cookie_timers(stcb);
 692                 sctp_toss_old_cookies(stcb, &stcb->asoc);
 693                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 694                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 695                 /*
 696                  * put it in the bucket in the vtag hash of assoc's for the
 697                  * system
 698                  */
 699                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 700                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 701                 return (1);
 702         }
 703         return (0);
 704 }
 705
 706 static int
 707 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
 708     struct sctp_nets *net)
 709 {
 710         /*
 711          * return 0 means we want you to proceed with the abort non-zero
 712          * means no abort processing
 713          */
 714         if (stcb->asoc.peer_supports_auth == 0) {
 715                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
 716                 return (0);
 717         }
 718         sctp_asconf_send_nat_state_update(stcb, net);
 719         return (1);
 720 }
 721
 722
 723 static void
 724 sctp_handle_abort(struct sctp_abort_chunk *cp,
 725     struct sctp_tcb *stcb, struct sctp_nets *net)
 726 {
 727 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 728         struct socket *so;
 729
 730 #endif
 731         uint16_t len;
 732
 733         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
 734         if (stcb == NULL)
 735                 return;
 736
 737         len = ntohs(cp->ch.chunk_length);
 738         if (len > sizeof(struct sctp_chunkhdr)) {
 739                 /*
 740                  * Need to check the cause codes for our two magic nat
 741                  * aborts which don't kill the assoc necessarily.
 742                  */
 743                 struct sctp_abort_chunk *cpnext;
 744                 struct sctp_missing_nat_state *natc;
 745                 uint16_t cause;
 746
 747                 cpnext = cp;
 748                 cpnext++;
 749                 natc = (struct sctp_missing_nat_state *)cpnext;
 750                 cause = ntohs(natc->cause);
 751                 if (cause == SCTP_CAUSE_NAT_COLLIDING_STATE) {
 752                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
 753                             cp->ch.chunk_flags);
 754                         if (sctp_handle_nat_colliding_state(stcb)) {
 755                                 return;
 756                         }
 757                 } else if (cause == SCTP_CAUSE_NAT_MISSING_STATE) {
 758                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
 759                             cp->ch.chunk_flags);
 760                         if (sctp_handle_nat_missing_state(stcb, net)) {
 761                                 return;
 762                         }
 763                 }
 764         }
 765         /* stop any receive timers */
 766         sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 767         /* notify user of the abort and clean up... */
 768         sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED);
 769         /* free the tcb */
 770 #if defined(SCTP_PANIC_ON_ABORT)
 771         printf("stcb:%p state:%d rport:%d net:%p\n",
 772             stcb, stcb->asoc.state, stcb->rport, net);
 773         if (!(stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET)) {
 774                 panic("Received an ABORT");
 775         } else {
 776                 printf("No panic its in state %x closed\n", stcb->asoc.state);
 777         }
 778 #endif
 779         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
 780         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) ||
 781             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 782                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 783         }
 784 #ifdef SCTP_ASOCLOG_OF_TSNS
 785         sctp_print_out_track_log(stcb);
 786 #endif
 787 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 788         so = SCTP_INP_SO(stcb->sctp_ep);
 789         atomic_add_int(&stcb->asoc.refcnt, 1);
 790         SCTP_TCB_UNLOCK(stcb);
 791         SCTP_SOCKET_LOCK(so, 1);
 792         SCTP_TCB_LOCK(stcb);
 793         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 794 #endif
 795         stcb->asoc.state |= SCTP_STATE_WAS_ABORTED;
 796         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 797             SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 798 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 799         SCTP_SOCKET_UNLOCK(so, 1);
 800 #endif
 801         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
 802 }
 803
 804 static void
 805 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
 806     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
 807 {
 808         struct sctp_association *asoc;
 809         int some_on_streamwheel;
 810
 811 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 812         struct socket *so;
 813
 814 #endif
 815
 816         SCTPDBG(SCTP_DEBUG_INPUT2,
 817             "sctp_handle_shutdown: handling SHUTDOWN\n");
 818         if (stcb == NULL)
 819                 return;
 820         asoc = &stcb->asoc;
 821         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 822             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 823                 return;
 824         }
 825         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
 826                 /* Shutdown NOT the expected size */
 827                 return;
 828         } else {
 829                 sctp_update_acked(stcb, cp, net, abort_flag);
 830                 if (*abort_flag) {
 831                         return;
 832                 }
 833         }
 834         if (asoc->control_pdapi) {
 835                 /*
 836                  * With a normal shutdown we assume the end of last record.
 837                  */
 838                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 839                 asoc->control_pdapi->end_added = 1;
 840                 asoc->control_pdapi->pdapi_aborted = 1;
 841                 asoc->control_pdapi = NULL;
 842                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 843 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 844                 so = SCTP_INP_SO(stcb->sctp_ep);
 845                 atomic_add_int(&stcb->asoc.refcnt, 1);
 846                 SCTP_TCB_UNLOCK(stcb);
 847                 SCTP_SOCKET_LOCK(so, 1);
 848                 SCTP_TCB_LOCK(stcb);
 849                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 850                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 851                         /* assoc was freed while we were unlocked */
 852                         SCTP_SOCKET_UNLOCK(so, 1);
 853                         return;
 854                 }
 855 #endif
 856                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 857 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 858                 SCTP_SOCKET_UNLOCK(so, 1);
 859 #endif
 860         }
 861         /* goto SHUTDOWN_RECEIVED state to block new requests */
 862         if (stcb->sctp_socket) {
 863                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 864                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
 865                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
 866                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED);
 867                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 868                         /*
 869                          * notify upper layer that peer has initiated a
 870                          * shutdown
 871                          */
 872                         sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 873
 874                         /* reset time */
 875                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
 876                 }
 877         }
 878         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
 879                 /*
 880                  * stop the shutdown timer, since we WILL move to
 881                  * SHUTDOWN-ACK-SENT.
 882                  */
 883                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
 884         }
 885         /* Now is there unsent data on a stream somewhere? */
 886         some_on_streamwheel = sctp_is_there_unsent_data(stcb);
 887
 888         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 889             !TAILQ_EMPTY(&asoc->sent_queue) ||
 890             some_on_streamwheel) {
 891                 /* By returning we will push more data out */
 892                 return;
 893         } else {
 894                 /* no outstanding data to send, so move on... */
 895                 /* send SHUTDOWN-ACK */
 896                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
 897                 /* move to SHUTDOWN-ACK-SENT state */
 898                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
 899                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 900                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 901                 }
 902                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
 903                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 904                 sctp_stop_timers_for_shutdown(stcb);
 905                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep,
 906                     stcb, net);
 907         }
 908 }
 909
 910 static void
 911 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp,
 912     struct sctp_tcb *stcb,
 913     struct sctp_nets *net)
 914 {
 915         struct sctp_association *asoc;
 916
 917 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 918         struct socket *so;
 919
 920         so = SCTP_INP_SO(stcb->sctp_ep);
 921 #endif
 922         SCTPDBG(SCTP_DEBUG_INPUT2,
 923             "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
 924         if (stcb == NULL)
 925                 return;
 926
 927         asoc = &stcb->asoc;
 928         /* process according to association state */
 929         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 930             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 931                 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
 932                 sctp_send_shutdown_complete(stcb, net, 1);
 933                 SCTP_TCB_UNLOCK(stcb);
 934                 return;
 935         }
 936         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
 937             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 938                 /* unexpected SHUTDOWN-ACK... so ignore... */
 939                 SCTP_TCB_UNLOCK(stcb);
 940                 return;
 941         }
 942         if (asoc->control_pdapi) {
 943                 /*
 944                  * With a normal shutdown we assume the end of last record.
 945                  */
 946                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 947                 asoc->control_pdapi->end_added = 1;
 948                 asoc->control_pdapi->pdapi_aborted = 1;
 949                 asoc->control_pdapi = NULL;
 950                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 951 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 952                 atomic_add_int(&stcb->asoc.refcnt, 1);
 953                 SCTP_TCB_UNLOCK(stcb);
 954                 SCTP_SOCKET_LOCK(so, 1);
 955                 SCTP_TCB_LOCK(stcb);
 956                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 957                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 958                         /* assoc was freed while we were unlocked */
 959                         SCTP_SOCKET_UNLOCK(so, 1);
 960                         return;
 961                 }
 962 #endif
 963                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 964 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 965                 SCTP_SOCKET_UNLOCK(so, 1);
 966 #endif
 967         }
 968         /* are the queues empty? */
 969         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 970             !TAILQ_EMPTY(&asoc->sent_queue) ||
 971             !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
 972                 sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED);
 973         }
 974         /* stop the timer */
 975         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
 976         /* send SHUTDOWN-COMPLETE */
 977         sctp_send_shutdown_complete(stcb, net, 0);
 978         /* notify upper layer protocol */
 979         if (stcb->sctp_socket) {
 980                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 981                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
 982                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
 983                         /* Set the connected flag to disconnected */
 984                         stcb->sctp_ep->sctp_socket->so_snd.sb_cc = 0;
 985                 }
 986         }
 987         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
 988         /* free the TCB but first save off the 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 #endif
 996         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 997             SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
 998 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 999         SCTP_SOCKET_UNLOCK(so, 1);
1000 #endif
1001 }
1002
1003 /*
1004  * Skip past the param header and then we will find the chunk that caused the
1005  * problem. There are two possiblities ASCONF or FWD-TSN other than that and
1006  * our peer must be broken.
1007  */
1008 static void
1009 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr,
1010     struct sctp_nets *net)
1011 {
1012         struct sctp_chunkhdr *chk;
1013
1014         chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr));
1015         switch (chk->chunk_type) {
1016         case SCTP_ASCONF_ACK:
1017         case SCTP_ASCONF:
1018                 sctp_asconf_cleanup(stcb, net);
1019                 break;
1020         case SCTP_FORWARD_CUM_TSN:
1021                 stcb->asoc.peer_supports_prsctp = 0;
1022                 break;
1023         default:
1024                 SCTPDBG(SCTP_DEBUG_INPUT2,
1025                     "Peer does not support chunk type %d(%x)??\n",
1026                     chk->chunk_type, (uint32_t) chk->chunk_type);
1027                 break;
1028         }
1029 }
1030
1031 /*
1032  * Skip past the param header and then we will find the param that caused the
1033  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1034  * these will turn of specific features.
1035  */
1036 static void
1037 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr)
1038 {
1039         struct sctp_paramhdr *pbad;
1040
1041         pbad = phdr + 1;
1042         switch (ntohs(pbad->param_type)) {
1043                 /* pr-sctp draft */
1044         case SCTP_PRSCTP_SUPPORTED:
1045                 stcb->asoc.peer_supports_prsctp = 0;
1046                 break;
1047         case SCTP_SUPPORTED_CHUNK_EXT:
1048                 break;
1049                 /* draft-ietf-tsvwg-addip-sctp */
1050         case SCTP_HAS_NAT_SUPPORT:
1051                 stcb->asoc.peer_supports_nat = 0;
1052                 break;
1053         case SCTP_ADD_IP_ADDRESS:
1054         case SCTP_DEL_IP_ADDRESS:
1055         case SCTP_SET_PRIM_ADDR:
1056                 stcb->asoc.peer_supports_asconf = 0;
1057                 break;
1058         case SCTP_SUCCESS_REPORT:
1059         case SCTP_ERROR_CAUSE_IND:
1060                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1061                 SCTPDBG(SCTP_DEBUG_INPUT2,
1062                     "Turning off ASCONF to this strange peer\n");
1063                 stcb->asoc.peer_supports_asconf = 0;
1064                 break;
1065         default:
1066                 SCTPDBG(SCTP_DEBUG_INPUT2,
1067                     "Peer does not support param type %d(%x)??\n",
1068                     pbad->param_type, (uint32_t) pbad->param_type);
1069                 break;
1070         }
1071 }
1072
1073 static int
1074 sctp_handle_error(struct sctp_chunkhdr *ch,
1075     struct sctp_tcb *stcb, struct sctp_nets *net)
1076 {
1077         int chklen;
1078         struct sctp_paramhdr *phdr;
1079         uint16_t error_type;
1080         uint16_t error_len;
1081         struct sctp_association *asoc;
1082         int adjust;
1083
1084 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1085         struct socket *so;
1086
1087 #endif
1088
1089         /* parse through all of the errors and process */
1090         asoc = &stcb->asoc;
1091         phdr = (struct sctp_paramhdr *)((caddr_t)ch +
1092             sizeof(struct sctp_chunkhdr));
1093         chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr);
1094         while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) {
1095                 /* Process an Error Cause */
1096                 error_type = ntohs(phdr->param_type);
1097                 error_len = ntohs(phdr->param_length);
1098                 if ((error_len > chklen) || (error_len == 0)) {
1099                         /* invalid param length for this param */
1100                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n",
1101                             chklen, error_len);
1102                         return (0);
1103                 }
1104                 switch (error_type) {
1105                 case SCTP_CAUSE_INVALID_STREAM:
1106                 case SCTP_CAUSE_MISSING_PARAM:
1107                 case SCTP_CAUSE_INVALID_PARAM:
1108                 case SCTP_CAUSE_NO_USER_DATA:
1109                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n",
1110                             error_type);
1111                         break;
1112                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1113                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
1114                             ch->chunk_flags);
1115                         if (sctp_handle_nat_colliding_state(stcb)) {
1116                                 return (0);
1117                         }
1118                         break;
1119                 case SCTP_CAUSE_NAT_MISSING_STATE:
1120                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
1121                             ch->chunk_flags);
1122                         if (sctp_handle_nat_missing_state(stcb, net)) {
1123                                 return (0);
1124                         }
1125                         break;
1126                 case SCTP_CAUSE_STALE_COOKIE:
1127                         /*
1128                          * We only act if we have echoed a cookie and are
1129                          * waiting.
1130                          */
1131                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
1132                                 int *p;
1133
1134                                 p = (int *)((caddr_t)phdr + sizeof(*phdr));
1135                                 /* Save the time doubled */
1136                                 asoc->cookie_preserve_req = ntohl(*p) << 1;
1137                                 asoc->stale_cookie_count++;
1138                                 if (asoc->stale_cookie_count >
1139                                     asoc->max_init_times) {
1140                                         sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED);
1141                                         /* now free the asoc */
1142 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1143                                         so = SCTP_INP_SO(stcb->sctp_ep);
1144                                         atomic_add_int(&stcb->asoc.refcnt, 1);
1145                                         SCTP_TCB_UNLOCK(stcb);
1146                                         SCTP_SOCKET_LOCK(so, 1);
1147                                         SCTP_TCB_LOCK(stcb);
1148                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1149 #endif
1150                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1151                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1152 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1153                                         SCTP_SOCKET_UNLOCK(so, 1);
1154 #endif
1155                                         return (-1);
1156                                 }
1157                                 /* blast back to INIT state */
1158                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
1159                                 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED;
1160                                 asoc->state |= SCTP_STATE_COOKIE_WAIT;
1161                                 sctp_stop_all_cookie_timers(stcb);
1162                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1163                         }
1164                         break;
1165                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1166                         /*
1167                          * Nothing we can do here, we don't do hostname
1168                          * addresses so if the peer does not like my IPv6
1169                          * (or IPv4 for that matter) it does not matter. If
1170                          * they don't support that type of address, they can
1171                          * NOT possibly get that packet type... i.e. with no
1172                          * IPv6 you can't recieve a IPv6 packet. so we can
1173                          * safely ignore this one. If we ever added support
1174                          * for HOSTNAME Addresses, then we would need to do
1175                          * something here.
1176                          */
1177                         break;
1178                 case SCTP_CAUSE_UNRECOG_CHUNK:
1179                         sctp_process_unrecog_chunk(stcb, phdr, net);
1180                         break;
1181                 case SCTP_CAUSE_UNRECOG_PARAM:
1182                         sctp_process_unrecog_param(stcb, phdr);
1183                         break;
1184                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1185                         /*
1186                          * We ignore this since the timer will drive out a
1187                          * new cookie anyway and there timer will drive us
1188                          * to send a SHUTDOWN_COMPLETE. We can't send one
1189                          * here since we don't have their tag.
1190                          */
1191                         break;
1192                 case SCTP_CAUSE_DELETING_LAST_ADDR:
1193                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1194                 case SCTP_CAUSE_DELETING_SRC_ADDR:
1195                         /*
1196                          * We should NOT get these here, but in a
1197                          * ASCONF-ACK.
1198                          */
1199                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n",
1200                             error_type);
1201                         break;
1202                 case SCTP_CAUSE_OUT_OF_RESC:
1203                         /*
1204                          * And what, pray tell do we do with the fact that
1205                          * the peer is out of resources? Not really sure we
1206                          * could do anything but abort. I suspect this
1207                          * should have came WITH an abort instead of in a
1208                          * OP-ERROR.
1209                          */
1210                         break;
1211                 default:
1212                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n",
1213                             error_type);
1214                         break;
1215                 }
1216                 adjust = SCTP_SIZE32(error_len);
1217                 chklen -= adjust;
1218                 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust);
1219         }
1220         return (0);
1221 }
1222
1223 static int
1224 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1225     struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1226     struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id)
1227 {
1228         struct sctp_init_ack *init_ack;
1229         struct mbuf *op_err;
1230
1231         SCTPDBG(SCTP_DEBUG_INPUT2,
1232             "sctp_handle_init_ack: handling INIT-ACK\n");
1233
1234         if (stcb == NULL) {
1235                 SCTPDBG(SCTP_DEBUG_INPUT2,
1236                     "sctp_handle_init_ack: TCB is null\n");
1237                 return (-1);
1238         }
1239         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1240                 /* Invalid length */
1241                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1242                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1243                     op_err, 0, net->port);
1244                 *abort_no_unlock = 1;
1245                 return (-1);
1246         }
1247         init_ack = &cp->init;
1248         /* validate parameters */
1249         if (init_ack->initiate_tag == 0) {
1250                 /* protocol error... send an abort */
1251                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1252                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1253                     op_err, 0, net->port);
1254                 *abort_no_unlock = 1;
1255                 return (-1);
1256         }
1257         if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1258                 /* protocol error... send an abort */
1259                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1260                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1261                     op_err, 0, net->port);
1262                 *abort_no_unlock = 1;
1263                 return (-1);
1264         }
1265         if (init_ack->num_inbound_streams == 0) {
1266                 /* protocol error... send an abort */
1267                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1268                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1269                     op_err, 0, net->port);
1270                 *abort_no_unlock = 1;
1271                 return (-1);
1272         }
1273         if (init_ack->num_outbound_streams == 0) {
1274                 /* protocol error... send an abort */
1275                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1276                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1277                     op_err, 0, net->port);
1278                 *abort_no_unlock = 1;
1279                 return (-1);
1280         }
1281         /* process according to association state... */
1282         switch (stcb->asoc.state & SCTP_STATE_MASK) {
1283         case SCTP_STATE_COOKIE_WAIT:
1284                 /* this is the expected state for this chunk */
1285                 /* process the INIT-ACK parameters */
1286                 if (stcb->asoc.primary_destination->dest_state &
1287                     SCTP_ADDR_UNCONFIRMED) {
1288                         /*
1289                          * The primary is where we sent the INIT, we can
1290                          * always consider it confirmed when the INIT-ACK is
1291                          * returned. Do this before we load addresses
1292                          * though.
1293                          */
1294                         stcb->asoc.primary_destination->dest_state &=
1295                             ~SCTP_ADDR_UNCONFIRMED;
1296                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1297                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1298                 }
1299                 if (sctp_process_init_ack(m, iphlen, offset, sh, cp, stcb,
1300                     net, abort_no_unlock, vrf_id) < 0) {
1301                         /* error in parsing parameters */
1302                         return (-1);
1303                 }
1304                 /* update our state */
1305                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1306                 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED);
1307
1308                 /* reset the RTO calc */
1309                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1310                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1311                             stcb->asoc.overall_error_count,
1312                             0,
1313                             SCTP_FROM_SCTP_INPUT,
1314                             __LINE__);
1315                 }
1316                 stcb->asoc.overall_error_count = 0;
1317                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1318                 /*
1319                  * collapse the init timer back in case of a exponential
1320                  * backoff
1321                  */
1322                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1323                     stcb, net);
1324                 /*
1325                  * the send at the end of the inbound data processing will
1326                  * cause the cookie to be sent
1327                  */
1328                 break;
1329         case SCTP_STATE_SHUTDOWN_SENT:
1330                 /* incorrect state... discard */
1331                 break;
1332         case SCTP_STATE_COOKIE_ECHOED:
1333                 /* incorrect state... discard */
1334                 break;
1335         case SCTP_STATE_OPEN:
1336                 /* incorrect state... discard */
1337                 break;
1338         case SCTP_STATE_EMPTY:
1339         case SCTP_STATE_INUSE:
1340         default:
1341                 /* incorrect state... discard */
1342                 return (-1);
1343                 break;
1344         }
1345         SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1346         return (0);
1347 }
1348
1349 static struct sctp_tcb *
1350 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1351     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1352     struct sctp_inpcb *inp, struct sctp_nets **netp,
1353     struct sockaddr *init_src, int *notification,
1354     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1355     uint32_t vrf_id, uint16_t port);
1356
1357
1358 /*
1359  * handle a state cookie for an existing association m: input packet mbuf
1360  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1361  * "split" mbuf and the cookie signature does not exist offset: offset into
1362  * mbuf to the cookie-echo chunk
1363  */
1364 static struct sctp_tcb *
1365 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1366     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1367     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1368     struct sockaddr *init_src, int *notification, sctp_assoc_t * sac_assoc_id,
1369     uint32_t vrf_id, int auth_skipped, uint32_t auth_offset, uint32_t auth_len, uint16_t port)
1370 {
1371         struct sctp_association *asoc;
1372         struct sctp_init_chunk *init_cp, init_buf;
1373         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1374         struct sctp_nets *net;
1375         struct mbuf *op_err;
1376         struct sctp_paramhdr *ph;
1377         int chk_length;
1378         int init_offset, initack_offset, i;
1379         int retval;
1380         int spec_flag = 0;
1381         uint32_t how_indx;
1382
1383         net = *netp;
1384         /* I know that the TCB is non-NULL from the caller */
1385         asoc = &stcb->asoc;
1386         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1387                 if (asoc->cookie_how[how_indx] == 0)
1388                         break;
1389         }
1390         if (how_indx < sizeof(asoc->cookie_how)) {
1391                 asoc->cookie_how[how_indx] = 1;
1392         }
1393         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1394                 /* SHUTDOWN came in after sending INIT-ACK */
1395                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1396                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
1397                     0, M_DONTWAIT, 1, MT_DATA);
1398                 if (op_err == NULL) {
1399                         /* FOOBAR */
1400                         return (NULL);
1401                 }
1402                 /* Set the len */
1403                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr);
1404                 ph = mtod(op_err, struct sctp_paramhdr *);
1405                 ph->param_type = htons(SCTP_CAUSE_COOKIE_IN_SHUTDOWN);
1406                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
1407                 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag,
1408                     vrf_id, net->port);
1409                 if (how_indx < sizeof(asoc->cookie_how))
1410                         asoc->cookie_how[how_indx] = 2;
1411                 return (NULL);
1412         }
1413         /*
1414          * find and validate the INIT chunk in the cookie (peer's info) the
1415          * INIT should start after the cookie-echo header struct (chunk
1416          * header, state cookie header struct)
1417          */
1418         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1419
1420         init_cp = (struct sctp_init_chunk *)
1421             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1422             (uint8_t *) & init_buf);
1423         if (init_cp == NULL) {
1424                 /* could not pull a INIT chunk in cookie */
1425                 return (NULL);
1426         }
1427         chk_length = ntohs(init_cp->ch.chunk_length);
1428         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1429                 return (NULL);
1430         }
1431         /*
1432          * find and validate the INIT-ACK chunk in the cookie (my info) the
1433          * INIT-ACK follows the INIT chunk
1434          */
1435         initack_offset = init_offset + SCTP_SIZE32(chk_length);
1436         initack_cp = (struct sctp_init_ack_chunk *)
1437             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1438             (uint8_t *) & initack_buf);
1439         if (initack_cp == NULL) {
1440                 /* could not pull INIT-ACK chunk in cookie */
1441                 return (NULL);
1442         }
1443         chk_length = ntohs(initack_cp->ch.chunk_length);
1444         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1445                 return (NULL);
1446         }
1447         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1448             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1449                 /*
1450                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
1451                  * to get into the OPEN state
1452                  */
1453                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1454                         /*-
1455                          * Opps, this means that we somehow generated two vtag's
1456                          * the same. I.e. we did:
1457                          *  Us               Peer
1458                          *   <---INIT(tag=a)------
1459                          *   ----INIT-ACK(tag=t)-->
1460                          *   ----INIT(tag=t)------> *1
1461                          *   <---INIT-ACK(tag=a)---
1462                          *   <----CE(tag=t)------------- *2
1463                          *
1464                          * At point *1 we should be generating a different
1465                          * tag t'. Which means we would throw away the CE and send
1466                          * ours instead. Basically this is case C (throw away side).
1467                          */
1468                         if (how_indx < sizeof(asoc->cookie_how))
1469                                 asoc->cookie_how[how_indx] = 17;
1470                         return (NULL);
1471
1472                 }
1473                 switch SCTP_GET_STATE
1474                         (asoc) {
1475                 case SCTP_STATE_COOKIE_WAIT:
1476                 case SCTP_STATE_COOKIE_ECHOED:
1477                         /*
1478                          * INIT was sent but got a COOKIE_ECHO with the
1479                          * correct tags... just accept it...but we must
1480                          * process the init so that we can make sure we have
1481                          * the right seq no's.
1482                          */
1483                         /* First we must process the INIT !! */
1484                         retval = sctp_process_init(init_cp, stcb, net);
1485                         if (retval < 0) {
1486                                 if (how_indx < sizeof(asoc->cookie_how))
1487                                         asoc->cookie_how[how_indx] = 3;
1488                                 return (NULL);
1489                         }
1490                         /* we have already processed the INIT so no problem */
1491                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb,
1492                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1493                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1494                         /* update current state */
1495                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1496                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1497                         else
1498                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1499
1500                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1501                         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1502                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1503                                     stcb->sctp_ep, stcb, asoc->primary_destination);
1504                         }
1505                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1506                         sctp_stop_all_cookie_timers(stcb);
1507                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1508                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1509                             (inp->sctp_socket->so_qlimit == 0)
1510                             ) {
1511 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1512                                 struct socket *so;
1513
1514 #endif
1515                                 /*
1516                                  * Here is where collision would go if we
1517                                  * did a connect() and instead got a
1518                                  * init/init-ack/cookie done before the
1519                                  * init-ack came back..
1520                                  */
1521                                 stcb->sctp_ep->sctp_flags |=
1522                                     SCTP_PCB_FLAGS_CONNECTED;
1523 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1524                                 so = SCTP_INP_SO(stcb->sctp_ep);
1525                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1526                                 SCTP_TCB_UNLOCK(stcb);
1527                                 SCTP_SOCKET_LOCK(so, 1);
1528                                 SCTP_TCB_LOCK(stcb);
1529                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1530                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1531                                         SCTP_SOCKET_UNLOCK(so, 1);
1532                                         return (NULL);
1533                                 }
1534 #endif
1535                                 soisconnected(stcb->sctp_socket);
1536 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1537                                 SCTP_SOCKET_UNLOCK(so, 1);
1538 #endif
1539                         }
1540                         /* notify upper layer */
1541                         *notification = SCTP_NOTIFY_ASSOC_UP;
1542                         /*
1543                          * since we did not send a HB make sure we don't
1544                          * double things
1545                          */
1546                         net->hb_responded = 1;
1547                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
1548                             &cookie->time_entered,
1549                             sctp_align_unsafe_makecopy,
1550                             SCTP_DETERMINE_LL_NOTOK);
1551
1552                         if (stcb->asoc.sctp_autoclose_ticks &&
1553                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1554                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1555                                     inp, stcb, NULL);
1556                         }
1557                         break;
1558                 default:
1559                         /*
1560                          * we're in the OPEN state (or beyond), so peer must
1561                          * have simply lost the COOKIE-ACK
1562                          */
1563                         break;
1564                         }       /* end switch */
1565                 sctp_stop_all_cookie_timers(stcb);
1566                 /*
1567                  * We ignore the return code here.. not sure if we should
1568                  * somehow abort.. but we do have an existing asoc. This
1569                  * really should not fail.
1570                  */
1571                 if (sctp_load_addresses_from_init(stcb, m, iphlen,
1572                     init_offset + sizeof(struct sctp_init_chunk),
1573                     initack_offset, sh, init_src)) {
1574                         if (how_indx < sizeof(asoc->cookie_how))
1575                                 asoc->cookie_how[how_indx] = 4;
1576                         return (NULL);
1577                 }
1578                 /* respond with a COOKIE-ACK */
1579                 sctp_toss_old_cookies(stcb, asoc);
1580                 sctp_send_cookie_ack(stcb);
1581                 if (how_indx < sizeof(asoc->cookie_how))
1582                         asoc->cookie_how[how_indx] = 5;
1583                 return (stcb);
1584         }
1585         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1586             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1587             cookie->tie_tag_my_vtag == 0 &&
1588             cookie->tie_tag_peer_vtag == 0) {
1589                 /*
1590                  * case C in Section 5.2.4 Table 2: XMOO silently discard
1591                  */
1592                 if (how_indx < sizeof(asoc->cookie_how))
1593                         asoc->cookie_how[how_indx] = 6;
1594                 return (NULL);
1595         }
1596         /*
1597          * If nat support, and the below and stcb is established, send back
1598          * a ABORT(colliding state) if we are established.
1599          */
1600         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) &&
1601             (asoc->peer_supports_nat) &&
1602             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1603             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1604             (asoc->peer_vtag == 0)))) {
1605                 /*
1606                  * Special case - Peer's support nat. We may have two init's
1607                  * that we gave out the same tag on since one was not
1608                  * established.. i.e. we get INIT from host-1 behind the nat
1609                  * and we respond tag-a, we get a INIT from host-2 behind
1610                  * the nat and we get tag-a again. Then we bring up host-1
1611                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1612                  * Now we have colliding state. We must send an abort here
1613                  * with colliding state indication.
1614                  */
1615                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
1616                     0, M_DONTWAIT, 1, MT_DATA);
1617                 if (op_err == NULL) {
1618                         /* FOOBAR */
1619                         return (NULL);
1620                 }
1621                 /* pre-reserve some space */
1622 #ifdef INET6
1623                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
1624 #else
1625                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
1626 #endif
1627                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
1628                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
1629                 /* Set the len */
1630                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr);
1631                 ph = mtod(op_err, struct sctp_paramhdr *);
1632                 ph->param_type = htons(SCTP_CAUSE_NAT_COLLIDING_STATE);
1633                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
1634                 sctp_send_abort(m, iphlen, sh, 0, op_err, vrf_id, port);
1635                 return (NULL);
1636         }
1637         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1638             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1639             (asoc->peer_vtag == 0))) {
1640                 /*
1641                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1642                  * should be ok, re-accept peer info
1643                  */
1644                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1645                         /*
1646                          * Extension of case C. If we hit this, then the
1647                          * random number generator returned the same vtag
1648                          * when we first sent our INIT-ACK and when we later
1649                          * sent our INIT. The side with the seq numbers that
1650                          * are different will be the one that normnally
1651                          * would have hit case C. This in effect "extends"
1652                          * our vtags in this collision case to be 64 bits.
1653                          * The same collision could occur aka you get both
1654                          * vtag and seq number the same twice in a row.. but
1655                          * is much less likely. If it did happen then we
1656                          * would proceed through and bring up the assoc.. we
1657                          * may end up with the wrong stream setup however..
1658                          * which would be bad.. but there is no way to
1659                          * tell.. until we send on a stream that does not
1660                          * exist :-)
1661                          */
1662                         if (how_indx < sizeof(asoc->cookie_how))
1663                                 asoc->cookie_how[how_indx] = 7;
1664
1665                         return (NULL);
1666                 }
1667                 if (how_indx < sizeof(asoc->cookie_how))
1668                         asoc->cookie_how[how_indx] = 8;
1669                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1670                 sctp_stop_all_cookie_timers(stcb);
1671                 /*
1672                  * since we did not send a HB make sure we don't double
1673                  * things
1674                  */
1675                 net->hb_responded = 1;
1676                 if (stcb->asoc.sctp_autoclose_ticks &&
1677                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1678                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1679                             NULL);
1680                 }
1681                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1682                 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1683
1684                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1685                         /*
1686                          * Ok the peer probably discarded our data (if we
1687                          * echoed a cookie+data). So anything on the
1688                          * sent_queue should be marked for retransmit, we
1689                          * may not get something to kick us so it COULD
1690                          * still take a timeout to move these.. but it can't
1691                          * hurt to mark them.
1692                          */
1693                         struct sctp_tmit_chunk *chk;
1694
1695                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1696                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1697                                         chk->sent = SCTP_DATAGRAM_RESEND;
1698                                         sctp_flight_size_decrease(chk);
1699                                         sctp_total_flight_decrease(stcb, chk);
1700                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1701                                         spec_flag++;
1702                                 }
1703                         }
1704
1705                 }
1706                 /* process the INIT info (peer's info) */
1707                 retval = sctp_process_init(init_cp, stcb, net);
1708                 if (retval < 0) {
1709                         if (how_indx < sizeof(asoc->cookie_how))
1710                                 asoc->cookie_how[how_indx] = 9;
1711                         return (NULL);
1712                 }
1713                 if (sctp_load_addresses_from_init(stcb, m, iphlen,
1714                     init_offset + sizeof(struct sctp_init_chunk),
1715                     initack_offset, sh, init_src)) {
1716                         if (how_indx < sizeof(asoc->cookie_how))
1717                                 asoc->cookie_how[how_indx] = 10;
1718                         return (NULL);
1719                 }
1720                 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) ||
1721                     (asoc->state & SCTP_STATE_COOKIE_ECHOED)) {
1722                         *notification = SCTP_NOTIFY_ASSOC_UP;
1723
1724                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1725                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1726                             (inp->sctp_socket->so_qlimit == 0)) {
1727 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1728                                 struct socket *so;
1729
1730 #endif
1731                                 stcb->sctp_ep->sctp_flags |=
1732                                     SCTP_PCB_FLAGS_CONNECTED;
1733 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1734                                 so = SCTP_INP_SO(stcb->sctp_ep);
1735                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1736                                 SCTP_TCB_UNLOCK(stcb);
1737                                 SCTP_SOCKET_LOCK(so, 1);
1738                                 SCTP_TCB_LOCK(stcb);
1739                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1740                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1741                                         SCTP_SOCKET_UNLOCK(so, 1);
1742                                         return (NULL);
1743                                 }
1744 #endif
1745                                 soisconnected(stcb->sctp_socket);
1746 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1747                                 SCTP_SOCKET_UNLOCK(so, 1);
1748 #endif
1749                         }
1750                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1751                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1752                         else
1753                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1754                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1755                 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1756                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1757                 } else {
1758                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1759                 }
1760                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1761                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1762                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1763                             stcb->sctp_ep, stcb, asoc->primary_destination);
1764                 }
1765                 sctp_stop_all_cookie_timers(stcb);
1766                 sctp_toss_old_cookies(stcb, asoc);
1767                 sctp_send_cookie_ack(stcb);
1768                 if (spec_flag) {
1769                         /*
1770                          * only if we have retrans set do we do this. What
1771                          * this call does is get only the COOKIE-ACK out and
1772                          * then when we return the normal call to
1773                          * sctp_chunk_output will get the retrans out behind
1774                          * this.
1775                          */
1776                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1777                 }
1778                 if (how_indx < sizeof(asoc->cookie_how))
1779                         asoc->cookie_how[how_indx] = 11;
1780
1781                 return (stcb);
1782         }
1783         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1784             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1785             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1786             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1787             cookie->tie_tag_peer_vtag != 0) {
1788                 struct sctpasochead *head;
1789
1790                 if (asoc->peer_supports_nat) {
1791                         /*
1792                          * This is a gross gross hack. just call the
1793                          * cookie_new code since we are allowing a duplicate
1794                          * association. I hope this works...
1795                          */
1796                         return (sctp_process_cookie_new(m, iphlen, offset, sh, cookie, cookie_len,
1797                             inp, netp, init_src, notification,
1798                             auth_skipped, auth_offset, auth_len,
1799                             vrf_id, port));
1800                 }
1801                 /*
1802                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1803                  */
1804                 /* temp code */
1805                 if (how_indx < sizeof(asoc->cookie_how))
1806                         asoc->cookie_how[how_indx] = 12;
1807                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1808                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1809
1810                 *sac_assoc_id = sctp_get_associd(stcb);
1811                 /* notify upper layer */
1812                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1813                 atomic_add_int(&stcb->asoc.refcnt, 1);
1814                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) &&
1815                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1816                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
1817                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1818                 }
1819                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1820                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1821                 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1822                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1823                 }
1824                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1825                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1826                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1827                             stcb->sctp_ep, stcb, asoc->primary_destination);
1828
1829                 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) {
1830                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1831                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1832                 }
1833                 asoc->pre_open_streams =
1834                     ntohs(initack_cp->init.num_outbound_streams);
1835                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1836                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1837                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1838
1839                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1840
1841                 asoc->str_reset_seq_in = asoc->init_seq_number;
1842
1843                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1844                 if (asoc->mapping_array) {
1845                         memset(asoc->mapping_array, 0,
1846                             asoc->mapping_array_size);
1847                 }
1848                 if (asoc->nr_mapping_array) {
1849                         memset(asoc->nr_mapping_array, 0,
1850                             asoc->mapping_array_size);
1851                 }
1852                 SCTP_TCB_UNLOCK(stcb);
1853                 SCTP_INP_INFO_WLOCK();
1854                 SCTP_INP_WLOCK(stcb->sctp_ep);
1855                 SCTP_TCB_LOCK(stcb);
1856                 atomic_add_int(&stcb->asoc.refcnt, -1);
1857                 /* send up all the data */
1858                 SCTP_TCB_SEND_LOCK(stcb);
1859
1860                 sctp_report_all_outbound(stcb, 1, SCTP_SO_NOT_LOCKED);
1861                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1862                         stcb->asoc.strmout[i].stream_no = i;
1863                         stcb->asoc.strmout[i].next_sequence_sent = 0;
1864                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
1865                 }
1866                 /* process the INIT-ACK info (my info) */
1867                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1868                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1869
1870                 /* pull from vtag hash */
1871                 LIST_REMOVE(stcb, sctp_asocs);
1872                 /* re-insert to new vtag position */
1873                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1874                     SCTP_BASE_INFO(hashasocmark))];
1875                 /*
1876                  * put it in the bucket in the vtag hash of assoc's for the
1877                  * system
1878                  */
1879                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
1880
1881                 /* process the INIT info (peer's info) */
1882                 SCTP_TCB_SEND_UNLOCK(stcb);
1883                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
1884                 SCTP_INP_INFO_WUNLOCK();
1885
1886                 retval = sctp_process_init(init_cp, stcb, net);
1887                 if (retval < 0) {
1888                         if (how_indx < sizeof(asoc->cookie_how))
1889                                 asoc->cookie_how[how_indx] = 13;
1890
1891                         return (NULL);
1892                 }
1893                 /*
1894                  * since we did not send a HB make sure we don't double
1895                  * things
1896                  */
1897                 net->hb_responded = 1;
1898
1899                 if (sctp_load_addresses_from_init(stcb, m, iphlen,
1900                     init_offset + sizeof(struct sctp_init_chunk),
1901                     initack_offset, sh, init_src)) {
1902                         if (how_indx < sizeof(asoc->cookie_how))
1903                                 asoc->cookie_how[how_indx] = 14;
1904
1905                         return (NULL);
1906                 }
1907                 /* respond with a COOKIE-ACK */
1908                 sctp_stop_all_cookie_timers(stcb);
1909                 sctp_toss_old_cookies(stcb, asoc);
1910                 sctp_send_cookie_ack(stcb);
1911                 if (how_indx < sizeof(asoc->cookie_how))
1912                         asoc->cookie_how[how_indx] = 15;
1913
1914                 return (stcb);
1915         }
1916         if (how_indx < sizeof(asoc->cookie_how))
1917                 asoc->cookie_how[how_indx] = 16;
1918         /* all other cases... */
1919         return (NULL);
1920 }
1921
1922
1923 /*
1924  * handle a state cookie for a new association m: input packet mbuf chain--
1925  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
1926  * and the cookie signature does not exist offset: offset into mbuf to the
1927  * cookie-echo chunk length: length of the cookie chunk to: where the init
1928  * was from returns a new TCB
1929  */
1930 struct sctp_tcb *
1931 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1932     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1933     struct sctp_inpcb *inp, struct sctp_nets **netp,
1934     struct sockaddr *init_src, int *notification,
1935     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1936     uint32_t vrf_id, uint16_t port)
1937 {
1938         struct sctp_tcb *stcb;
1939         struct sctp_init_chunk *init_cp, init_buf;
1940         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1941         struct sockaddr_storage sa_store;
1942         struct sockaddr *initack_src = (struct sockaddr *)&sa_store;
1943         struct sockaddr_in *sin;
1944         struct sockaddr_in6 *sin6;
1945         struct sctp_association *asoc;
1946         int chk_length;
1947         int init_offset, initack_offset, initack_limit;
1948         int retval;
1949         int error = 0;
1950         uint32_t old_tag;
1951         uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
1952
1953 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1954         struct socket *so;
1955
1956         so = SCTP_INP_SO(inp);
1957 #endif
1958
1959         /*
1960          * find and validate the INIT chunk in the cookie (peer's info) the
1961          * INIT should start after the cookie-echo header struct (chunk
1962          * header, state cookie header struct)
1963          */
1964         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
1965         init_cp = (struct sctp_init_chunk *)
1966             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1967             (uint8_t *) & init_buf);
1968         if (init_cp == NULL) {
1969                 /* could not pull a INIT chunk in cookie */
1970                 SCTPDBG(SCTP_DEBUG_INPUT1,
1971                     "process_cookie_new: could not pull INIT chunk hdr\n");
1972                 return (NULL);
1973         }
1974         chk_length = ntohs(init_cp->ch.chunk_length);
1975         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1976                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
1977                 return (NULL);
1978         }
1979         initack_offset = init_offset + SCTP_SIZE32(chk_length);
1980         /*
1981          * find and validate the INIT-ACK chunk in the cookie (my info) the
1982          * INIT-ACK follows the INIT chunk
1983          */
1984         initack_cp = (struct sctp_init_ack_chunk *)
1985             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1986             (uint8_t *) & initack_buf);
1987         if (initack_cp == NULL) {
1988                 /* could not pull INIT-ACK chunk in cookie */
1989                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
1990                 return (NULL);
1991         }
1992         chk_length = ntohs(initack_cp->ch.chunk_length);
1993         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1994                 return (NULL);
1995         }
1996         /*
1997          * NOTE: We can't use the INIT_ACK's chk_length to determine the
1998          * "initack_limit" value.  This is because the chk_length field
1999          * includes the length of the cookie, but the cookie is omitted when
2000          * the INIT and INIT_ACK are tacked onto the cookie...
2001          */
2002         initack_limit = offset + cookie_len;
2003
2004         /*
2005          * now that we know the INIT/INIT-ACK are in place, create a new TCB
2006          * and popluate
2007          */
2008
2009         /*
2010          * Here we do a trick, we set in NULL for the proc/thread argument.
2011          * We do this since in effect we only use the p argument when the
2012          * socket is unbound and we must do an implicit bind. Since we are
2013          * getting a cookie, we cannot be unbound.
2014          */
2015         stcb = sctp_aloc_assoc(inp, init_src, &error,
2016             ntohl(initack_cp->init.initiate_tag), vrf_id,
2017             (struct thread *)NULL
2018             );
2019         if (stcb == NULL) {
2020                 struct mbuf *op_err;
2021
2022                 /* memory problem? */
2023                 SCTPDBG(SCTP_DEBUG_INPUT1,
2024                     "process_cookie_new: no room for another TCB!\n");
2025                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2026
2027                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2028                     sh, op_err, vrf_id, port);
2029                 return (NULL);
2030         }
2031         /* get the correct sctp_nets */
2032         if (netp)
2033                 *netp = sctp_findnet(stcb, init_src);
2034
2035         asoc = &stcb->asoc;
2036         /* get scope variables out of cookie */
2037         asoc->ipv4_local_scope = cookie->ipv4_scope;
2038         asoc->site_scope = cookie->site_scope;
2039         asoc->local_scope = cookie->local_scope;
2040         asoc->loopback_scope = cookie->loopback_scope;
2041
2042         if ((asoc->ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2043             (asoc->ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2044                 struct mbuf *op_err;
2045
2046                 /*
2047                  * Houston we have a problem. The EP changed while the
2048                  * cookie was in flight. Only recourse is to abort the
2049                  * association.
2050                  */
2051                 atomic_add_int(&stcb->asoc.refcnt, 1);
2052                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2053                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2054                     sh, op_err, vrf_id, port);
2055 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2056                 SCTP_TCB_UNLOCK(stcb);
2057                 SCTP_SOCKET_LOCK(so, 1);
2058                 SCTP_TCB_LOCK(stcb);
2059 #endif
2060                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2061                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
2062 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2063                 SCTP_SOCKET_UNLOCK(so, 1);
2064 #endif
2065                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2066                 return (NULL);
2067         }
2068         /* process the INIT-ACK info (my info) */
2069         old_tag = asoc->my_vtag;
2070         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2071         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2072         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2073         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2074         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2075         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2076         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2077         asoc->str_reset_seq_in = asoc->init_seq_number;
2078
2079         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2080
2081         /* process the INIT info (peer's info) */
2082         if (netp)
2083                 retval = sctp_process_init(init_cp, stcb, *netp);
2084         else
2085                 retval = 0;
2086         if (retval < 0) {
2087                 atomic_add_int(&stcb->asoc.refcnt, 1);
2088 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2089                 SCTP_TCB_UNLOCK(stcb);
2090                 SCTP_SOCKET_LOCK(so, 1);
2091                 SCTP_TCB_LOCK(stcb);
2092 #endif
2093                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
2094 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2095                 SCTP_SOCKET_UNLOCK(so, 1);
2096 #endif
2097                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2098                 return (NULL);
2099         }
2100         /* load all addresses */
2101         if (sctp_load_addresses_from_init(stcb, m, iphlen,
2102             init_offset + sizeof(struct sctp_init_chunk), initack_offset, sh,
2103             init_src)) {
2104                 atomic_add_int(&stcb->asoc.refcnt, 1);
2105 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2106                 SCTP_TCB_UNLOCK(stcb);
2107                 SCTP_SOCKET_LOCK(so, 1);
2108                 SCTP_TCB_LOCK(stcb);
2109 #endif
2110                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
2111 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2112                 SCTP_SOCKET_UNLOCK(so, 1);
2113 #endif
2114                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2115                 return (NULL);
2116         }
2117         /*
2118          * verify any preceding AUTH chunk that was skipped
2119          */
2120         /* pull the local authentication parameters from the cookie/init-ack */
2121         sctp_auth_get_cookie_params(stcb, m,
2122             initack_offset + sizeof(struct sctp_init_ack_chunk),
2123             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2124         if (auth_skipped) {
2125                 struct sctp_auth_chunk *auth;
2126
2127                 auth = (struct sctp_auth_chunk *)
2128                     sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2129                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2130                         /* auth HMAC failed, dump the assoc and packet */
2131                         SCTPDBG(SCTP_DEBUG_AUTH1,
2132                             "COOKIE-ECHO: AUTH failed\n");
2133                         atomic_add_int(&stcb->asoc.refcnt, 1);
2134 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2135                         SCTP_TCB_UNLOCK(stcb);
2136                         SCTP_SOCKET_LOCK(so, 1);
2137                         SCTP_TCB_LOCK(stcb);
2138 #endif
2139                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2140 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2141                         SCTP_SOCKET_UNLOCK(so, 1);
2142 #endif
2143                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2144                         return (NULL);
2145                 } else {
2146                         /* remaining chunks checked... good to go */
2147                         stcb->asoc.authenticated = 1;
2148                 }
2149         }
2150         /* update current state */
2151         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2152         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2153         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2154                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2155                     stcb->sctp_ep, stcb, asoc->primary_destination);
2156         }
2157         sctp_stop_all_cookie_timers(stcb);
2158         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2159         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2160
2161         /*
2162          * if we're doing ASCONFs, check to see if we have any new local
2163          * addresses that need to get added to the peer (eg. addresses
2164          * changed while cookie echo in flight).  This needs to be done
2165          * after we go to the OPEN state to do the correct asconf
2166          * processing. else, make sure we have the correct addresses in our
2167          * lists
2168          */
2169
2170         /* warning, we re-use sin, sin6, sa_store here! */
2171         /* pull in local_address (our "from" address) */
2172         if (cookie->laddr_type == SCTP_IPV4_ADDRESS) {
2173                 /* source addr is IPv4 */
2174                 sin = (struct sockaddr_in *)initack_src;
2175                 memset(sin, 0, sizeof(*sin));
2176                 sin->sin_family = AF_INET;
2177                 sin->sin_len = sizeof(struct sockaddr_in);
2178                 sin->sin_addr.s_addr = cookie->laddress[0];
2179         } else if (cookie->laddr_type == SCTP_IPV6_ADDRESS) {
2180                 /* source addr is IPv6 */
2181                 sin6 = (struct sockaddr_in6 *)initack_src;
2182                 memset(sin6, 0, sizeof(*sin6));
2183                 sin6->sin6_family = AF_INET6;
2184                 sin6->sin6_len = sizeof(struct sockaddr_in6);
2185                 sin6->sin6_scope_id = cookie->scope_id;
2186                 memcpy(&sin6->sin6_addr, cookie->laddress,
2187                     sizeof(sin6->sin6_addr));
2188         } else {
2189                 atomic_add_int(&stcb->asoc.refcnt, 1);
2190 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2191                 SCTP_TCB_UNLOCK(stcb);
2192                 SCTP_SOCKET_LOCK(so, 1);
2193                 SCTP_TCB_LOCK(stcb);
2194 #endif
2195                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2196 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2197                 SCTP_SOCKET_UNLOCK(so, 1);
2198 #endif
2199                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2200                 return (NULL);
2201         }
2202
2203         /* set up to notify upper layer */
2204         *notification = SCTP_NOTIFY_ASSOC_UP;
2205         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2206             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2207             (inp->sctp_socket->so_qlimit == 0)) {
2208                 /*
2209                  * This is an endpoint that called connect() how it got a
2210                  * cookie that is NEW is a bit of a mystery. It must be that
2211                  * the INIT was sent, but before it got there.. a complete
2212                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2213                  * should have went to the other code.. not here.. oh well..
2214                  * a bit of protection is worth having..
2215                  */
2216                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2217 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2218                 atomic_add_int(&stcb->asoc.refcnt, 1);
2219                 SCTP_TCB_UNLOCK(stcb);
2220                 SCTP_SOCKET_LOCK(so, 1);
2221                 SCTP_TCB_LOCK(stcb);
2222                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2223                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2224                         SCTP_SOCKET_UNLOCK(so, 1);
2225                         return (NULL);
2226                 }
2227 #endif
2228                 soisconnected(stcb->sctp_socket);
2229 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2230                 SCTP_SOCKET_UNLOCK(so, 1);
2231 #endif
2232         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2233             (inp->sctp_socket->so_qlimit)) {
2234                 /*
2235                  * We don't want to do anything with this one. Since it is
2236                  * the listening guy. The timer will get started for
2237                  * accepted connections in the caller.
2238                  */
2239                 ;
2240         }
2241         /* since we did not send a HB make sure we don't double things */
2242         if ((netp) && (*netp))
2243                 (*netp)->hb_responded = 1;
2244
2245         if (stcb->asoc.sctp_autoclose_ticks &&
2246             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2247                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2248         }
2249         /* calculate the RTT */
2250         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2251         if ((netp) && (*netp)) {
2252                 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
2253                     &cookie->time_entered, sctp_align_unsafe_makecopy,
2254                     SCTP_DETERMINE_LL_NOTOK);
2255         }
2256         /* respond with a COOKIE-ACK */
2257         sctp_send_cookie_ack(stcb);
2258
2259         /*
2260          * check the address lists for any ASCONFs that need to be sent
2261          * AFTER the cookie-ack is sent
2262          */
2263         sctp_check_address_list(stcb, m,
2264             initack_offset + sizeof(struct sctp_init_ack_chunk),
2265             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2266             initack_src, cookie->local_scope, cookie->site_scope,
2267             cookie->ipv4_scope, cookie->loopback_scope);
2268
2269
2270         return (stcb);
2271 }
2272
2273 /*
2274  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2275  * we NEED to make sure we are not already using the vtag. If so we
2276  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2277         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2278                                                             SCTP_BASE_INFO(hashasocmark))];
2279         LIST_FOREACH(stcb, head, sctp_asocs) {
2280                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2281                        -- SEND ABORT - TRY AGAIN --
2282                 }
2283         }
2284 */
2285
2286 /*
2287  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2288  * existing (non-NULL) TCB
2289  */
2290 static struct mbuf *
2291 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2292     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2293     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2294     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2295     struct sctp_tcb **locked_tcb, uint32_t vrf_id, uint16_t port)
2296 {
2297         struct sctp_state_cookie *cookie;
2298         struct sockaddr_in6 sin6;
2299         struct sockaddr_in sin;
2300         struct sctp_tcb *l_stcb = *stcb;
2301         struct sctp_inpcb *l_inp;
2302         struct sockaddr *to;
2303         sctp_assoc_t sac_restart_id;
2304         struct sctp_pcb *ep;
2305         struct mbuf *m_sig;
2306         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2307         uint8_t *sig;
2308         uint8_t cookie_ok = 0;
2309         unsigned int size_of_pkt, sig_offset, cookie_offset;
2310         unsigned int cookie_len;
2311         struct timeval now;
2312         struct timeval time_expires;
2313         struct sockaddr_storage dest_store;
2314         struct sockaddr *localep_sa = (struct sockaddr *)&dest_store;
2315         struct ip *iph;
2316         int notification = 0;
2317         struct sctp_nets *netl;
2318         int had_a_existing_tcb = 0;
2319         int send_int_conf = 0;
2320
2321         SCTPDBG(SCTP_DEBUG_INPUT2,
2322             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2323
2324         if (inp_p == NULL) {
2325                 return (NULL);
2326         }
2327         /* First get the destination address setup too. */
2328         iph = mtod(m, struct ip *);
2329         switch (iph->ip_v) {
2330         case IPVERSION:
2331                 {
2332                         /* its IPv4 */
2333                         struct sockaddr_in *lsin;
2334
2335                         lsin = (struct sockaddr_in *)(localep_sa);
2336                         memset(lsin, 0, sizeof(*lsin));
2337                         lsin->sin_family = AF_INET;
2338                         lsin->sin_len = sizeof(*lsin);
2339                         lsin->sin_port = sh->dest_port;
2340                         lsin->sin_addr.s_addr = iph->ip_dst.s_addr;
2341                         size_of_pkt = SCTP_GET_IPV4_LENGTH(iph);
2342                         break;
2343                 }
2344 #ifdef INET6
2345         case IPV6_VERSION >> 4:
2346                 {
2347                         /* its IPv6 */
2348                         struct ip6_hdr *ip6;
2349                         struct sockaddr_in6 *lsin6;
2350
2351                         lsin6 = (struct sockaddr_in6 *)(localep_sa);
2352                         memset(lsin6, 0, sizeof(*lsin6));
2353                         lsin6->sin6_family = AF_INET6;
2354                         lsin6->sin6_len = sizeof(struct sockaddr_in6);
2355                         ip6 = mtod(m, struct ip6_hdr *);
2356                         lsin6->sin6_port = sh->dest_port;
2357                         lsin6->sin6_addr = ip6->ip6_dst;
2358                         size_of_pkt = SCTP_GET_IPV6_LENGTH(ip6) + iphlen;
2359                         break;
2360                 }
2361 #endif
2362         default:
2363                 return (NULL);
2364         }
2365
2366         cookie = &cp->cookie;
2367         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2368         cookie_len = ntohs(cp->ch.chunk_length);
2369
2370         if ((cookie->peerport != sh->src_port) &&
2371             (cookie->myport != sh->dest_port) &&
2372             (cookie->my_vtag != sh->v_tag)) {
2373                 /*
2374                  * invalid ports or bad tag.  Note that we always leave the
2375                  * v_tag in the header in network order and when we stored
2376                  * it in the my_vtag slot we also left it in network order.
2377                  * This maintains the match even though it may be in the
2378                  * opposite byte order of the machine :->
2379                  */
2380                 return (NULL);
2381         }
2382         if (cookie_len > size_of_pkt ||
2383             cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2384             sizeof(struct sctp_init_chunk) +
2385             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2386                 /* cookie too long!  or too small */
2387                 return (NULL);
2388         }
2389         /*
2390          * split off the signature into its own mbuf (since it should not be
2391          * calculated in the sctp_hmac_m() call).
2392          */
2393         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2394         if (sig_offset > size_of_pkt) {
2395                 /* packet not correct size! */
2396                 /* XXX this may already be accounted for earlier... */
2397                 return (NULL);
2398         }
2399         m_sig = m_split(m, sig_offset, M_DONTWAIT);
2400         if (m_sig == NULL) {
2401                 /* out of memory or ?? */
2402                 return (NULL);
2403         }
2404 #ifdef SCTP_MBUF_LOGGING
2405         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2406                 struct mbuf *mat;
2407
2408                 mat = m_sig;
2409                 while (mat) {
2410                         if (SCTP_BUF_IS_EXTENDED(mat)) {
2411                                 sctp_log_mb(mat, SCTP_MBUF_SPLIT);
2412                         }
2413                         mat = SCTP_BUF_NEXT(mat);
2414                 }
2415         }
2416 #endif
2417
2418         /*
2419          * compute the signature/digest for the cookie
2420          */
2421         ep = &(*inp_p)->sctp_ep;
2422         l_inp = *inp_p;
2423         if (l_stcb) {
2424                 SCTP_TCB_UNLOCK(l_stcb);
2425         }
2426         SCTP_INP_RLOCK(l_inp);
2427         if (l_stcb) {
2428                 SCTP_TCB_LOCK(l_stcb);
2429         }
2430         /* which cookie is it? */
2431         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2432             (ep->current_secret_number != ep->last_secret_number)) {
2433                 /* it's the old cookie */
2434                 (void)sctp_hmac_m(SCTP_HMAC,
2435                     (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2436                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2437         } else {
2438                 /* it's the current cookie */
2439                 (void)sctp_hmac_m(SCTP_HMAC,
2440                     (uint8_t *) ep->secret_key[(int)ep->current_secret_number],
2441                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2442         }
2443         /* get the signature */
2444         SCTP_INP_RUNLOCK(l_inp);
2445         sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig);
2446         if (sig == NULL) {
2447                 /* couldn't find signature */
2448                 sctp_m_freem(m_sig);
2449                 return (NULL);
2450         }
2451         /* compare the received digest with the computed digest */
2452         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2453                 /* try the old cookie? */
2454                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2455                     (ep->current_secret_number != ep->last_secret_number)) {
2456                         /* compute digest with old */
2457                         (void)sctp_hmac_m(SCTP_HMAC,
2458                             (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2459                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2460                         /* compare */
2461                         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2462                                 cookie_ok = 1;
2463                 }
2464         } else {
2465                 cookie_ok = 1;
2466         }
2467
2468         /*
2469          * Now before we continue we must reconstruct our mbuf so that
2470          * normal processing of any other chunks will work.
2471          */
2472         {
2473                 struct mbuf *m_at;
2474
2475                 m_at = m;
2476                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2477                         m_at = SCTP_BUF_NEXT(m_at);
2478                 }
2479                 SCTP_BUF_NEXT(m_at) = m_sig;
2480         }
2481
2482         if (cookie_ok == 0) {
2483                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2484                 SCTPDBG(SCTP_DEBUG_INPUT2,
2485                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2486                     (uint32_t) offset, cookie_offset, sig_offset);
2487                 return (NULL);
2488         }
2489         /*
2490          * check the cookie timestamps to be sure it's not stale
2491          */
2492         (void)SCTP_GETTIME_TIMEVAL(&now);
2493         /* Expire time is in Ticks, so we convert to seconds */
2494         time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
2495         time_expires.tv_usec = cookie->time_entered.tv_usec;
2496         /*
2497          * TODO sctp_constants.h needs alternative time macros when _KERNEL
2498          * is undefined.
2499          */
2500         if (timevalcmp(&now, &time_expires, >)) {
2501                 /* cookie is stale! */
2502                 struct mbuf *op_err;
2503                 struct sctp_stale_cookie_msg *scm;
2504                 uint32_t tim;
2505
2506                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg),
2507                     0, M_DONTWAIT, 1, MT_DATA);
2508                 if (op_err == NULL) {
2509                         /* FOOBAR */
2510                         return (NULL);
2511                 }
2512                 /* Set the len */
2513                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg);
2514                 scm = mtod(op_err, struct sctp_stale_cookie_msg *);
2515                 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE);
2516                 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) +
2517                     (sizeof(uint32_t))));
2518                 /* seconds to usec */
2519                 tim = (now.tv_sec - time_expires.tv_sec) * 1000000;
2520                 /* add in usec */
2521                 if (tim == 0)
2522                         tim = now.tv_usec - cookie->time_entered.tv_usec;
2523                 scm->time_usec = htonl(tim);
2524                 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag,
2525                     vrf_id, port);
2526                 return (NULL);
2527         }
2528         /*
2529          * Now we must see with the lookup address if we have an existing
2530          * asoc. This will only happen if we were in the COOKIE-WAIT state
2531          * and a INIT collided with us and somewhere the peer sent the
2532          * cookie on another address besides the single address our assoc
2533          * had for him. In this case we will have one of the tie-tags set at
2534          * least AND the address field in the cookie can be used to look it
2535          * up.
2536          */
2537         to = NULL;
2538         if (cookie->addr_type == SCTP_IPV6_ADDRESS) {
2539                 memset(&sin6, 0, sizeof(sin6));
2540                 sin6.sin6_family = AF_INET6;
2541                 sin6.sin6_len = sizeof(sin6);
2542                 sin6.sin6_port = sh->src_port;
2543                 sin6.sin6_scope_id = cookie->scope_id;
2544                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2545                     sizeof(sin6.sin6_addr.s6_addr));
2546                 to = (struct sockaddr *)&sin6;
2547         } else if (cookie->addr_type == SCTP_IPV4_ADDRESS) {
2548                 memset(&sin, 0, sizeof(sin));
2549                 sin.sin_family = AF_INET;
2550                 sin.sin_len = sizeof(sin);
2551                 sin.sin_port = sh->src_port;
2552                 sin.sin_addr.s_addr = cookie->address[0];
2553                 to = (struct sockaddr *)&sin;
2554         } else {
2555                 /* This should not happen */
2556                 return (NULL);
2557         }
2558         if ((*stcb == NULL) && to) {
2559                 /* Yep, lets check */
2560                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, localep_sa, NULL);
2561                 if (*stcb == NULL) {
2562                         /*
2563                          * We should have only got back the same inp. If we
2564                          * got back a different ep we have a problem. The
2565                          * original findep got back l_inp and now
2566                          */
2567                         if (l_inp != *inp_p) {
2568                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2569                         }
2570                 } else {
2571                         if (*locked_tcb == NULL) {
2572                                 /*
2573                                  * In this case we found the assoc only
2574                                  * after we locked the create lock. This
2575                                  * means we are in a colliding case and we
2576                                  * must make sure that we unlock the tcb if
2577                                  * its one of the cases where we throw away
2578                                  * the incoming packets.
2579                                  */
2580                                 *locked_tcb = *stcb;
2581
2582                                 /*
2583                                  * We must also increment the inp ref count
2584                                  * since the ref_count flags was set when we
2585                                  * did not find the TCB, now we found it
2586                                  * which reduces the refcount.. we must
2587                                  * raise it back out to balance it all :-)
2588                                  */
2589                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2590                                 if ((*stcb)->sctp_ep != l_inp) {
2591                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2592                                             (*stcb)->sctp_ep, l_inp);
2593                                 }
2594                         }
2595                 }
2596         }
2597         if (to == NULL) {
2598                 return (NULL);
2599         }
2600         cookie_len -= SCTP_SIGNATURE_SIZE;
2601         if (*stcb == NULL) {
2602                 /* this is the "normal" case... get a new TCB */
2603                 *stcb = sctp_process_cookie_new(m, iphlen, offset, sh, cookie,
2604                     cookie_len, *inp_p, netp, to, &notification,
2605                     auth_skipped, auth_offset, auth_len, vrf_id, port);
2606         } else {
2607                 /* this is abnormal... cookie-echo on existing TCB */
2608                 had_a_existing_tcb = 1;
2609                 *stcb = sctp_process_cookie_existing(m, iphlen, offset, sh,
2610                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2611                     &notification, &sac_restart_id, vrf_id, auth_skipped, auth_offset, auth_len, port);
2612         }
2613
2614         if (*stcb == NULL) {
2615                 /* still no TCB... must be bad cookie-echo */
2616                 return (NULL);
2617         }
2618         if ((*netp != NULL) && (m->m_flags & M_FLOWID)) {
2619                 (*netp)->flowid = m->m_pkthdr.flowid;
2620 #ifdef INVARIANTS
2621                 (*netp)->flowidset = 1;
2622 #endif
2623         }
2624         /*
2625          * Ok, we built an association so confirm the address we sent the
2626          * INIT-ACK to.
2627          */
2628         netl = sctp_findnet(*stcb, to);
2629         /*
2630          * This code should in theory NOT run but
2631          */
2632         if (netl == NULL) {
2633                 /* TSNH! Huh, why do I need to add this address here? */
2634                 int ret;
2635
2636                 ret = sctp_add_remote_addr(*stcb, to, SCTP_DONOT_SETSCOPE,
2637                     SCTP_IN_COOKIE_PROC);
2638                 netl = sctp_findnet(*stcb, to);
2639         }
2640         if (netl) {
2641                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2642                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2643                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2644                             netl);
2645                         send_int_conf = 1;
2646                 }
2647         }
2648         if (*stcb) {
2649                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, *inp_p,
2650                     *stcb, NULL);
2651         }
2652         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2653                 if (!had_a_existing_tcb ||
2654                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2655                         /*
2656                          * If we have a NEW cookie or the connect never
2657                          * reached the connected state during collision we
2658                          * must do the TCP accept thing.
2659                          */
2660                         struct socket *so, *oso;
2661                         struct sctp_inpcb *inp;
2662
2663                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2664                                 /*
2665                                  * For a restart we will keep the same
2666                                  * socket, no need to do anything. I THINK!!
2667                                  */
2668                                 sctp_ulp_notify(notification, *stcb, 0, (void *)&sac_restart_id, SCTP_SO_NOT_LOCKED);
2669                                 if (send_int_conf) {
2670                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2671                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2672                                 }
2673                                 return (m);
2674                         }
2675                         oso = (*inp_p)->sctp_socket;
2676                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2677                         SCTP_TCB_UNLOCK((*stcb));
2678                         CURVNET_SET(oso->so_vnet);
2679                         so = sonewconn(oso, 0
2680                             );
2681                         CURVNET_RESTORE();
2682                         SCTP_TCB_LOCK((*stcb));
2683                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2684
2685                         if (so == NULL) {
2686                                 struct mbuf *op_err;
2687
2688 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2689                                 struct socket *pcb_so;
2690
2691 #endif
2692                                 /* Too many sockets */
2693                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2694                                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2695                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2696                                     sh, op_err, vrf_id, port);
2697 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2698                                 pcb_so = SCTP_INP_SO(*inp_p);
2699                                 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2700                                 SCTP_TCB_UNLOCK((*stcb));
2701                                 SCTP_SOCKET_LOCK(pcb_so, 1);
2702                                 SCTP_TCB_LOCK((*stcb));
2703                                 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2704 #endif
2705                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2706 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2707                                 SCTP_SOCKET_UNLOCK(pcb_so, 1);
2708 #endif
2709                                 return (NULL);
2710                         }
2711                         inp = (struct sctp_inpcb *)so->so_pcb;
2712                         SCTP_INP_INCR_REF(inp);
2713                         /*
2714                          * We add the unbound flag here so that if we get an
2715                          * soabort() before we get the move_pcb done, we
2716                          * will properly cleanup.
2717                          */
2718                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2719                             SCTP_PCB_FLAGS_CONNECTED |
2720                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2721                             SCTP_PCB_FLAGS_UNBOUND |
2722                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2723                             SCTP_PCB_FLAGS_DONT_WAKE);
2724                         inp->sctp_features = (*inp_p)->sctp_features;
2725                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2726                         inp->sctp_socket = so;
2727                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2728                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2729                         inp->sctp_ecn_enable = (*inp_p)->sctp_ecn_enable;
2730                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2731                         inp->sctp_context = (*inp_p)->sctp_context;
2732                         inp->inp_starting_point_for_iterator = NULL;
2733                         /*
2734                          * copy in the authentication parameters from the
2735                          * original endpoint
2736                          */
2737                         if (inp->sctp_ep.local_hmacs)
2738                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2739                         inp->sctp_ep.local_hmacs =
2740                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2741                         if (inp->sctp_ep.local_auth_chunks)
2742                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2743                         inp->sctp_ep.local_auth_chunks =
2744                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2745
2746                         /*
2747                          * Now we must move it from one hash table to
2748                          * another and get the tcb in the right place.
2749                          */
2750
2751                         /*
2752                          * This is where the one-2-one socket is put into
2753                          * the accept state waiting for the accept!
2754                          */
2755                         if (*stcb) {
2756                                 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE;
2757                         }
2758                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2759
2760                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2761                         SCTP_TCB_UNLOCK((*stcb));
2762
2763                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2764                             0);
2765                         SCTP_TCB_LOCK((*stcb));
2766                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2767
2768
2769                         /*
2770                          * now we must check to see if we were aborted while
2771                          * the move was going on and the lock/unlock
2772                          * happened.
2773                          */
2774                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2775                                 /*
2776                                  * yep it was, we leave the assoc attached
2777                                  * to the socket since the sctp_inpcb_free()
2778                                  * call will send an abort for us.
2779                                  */
2780                                 SCTP_INP_DECR_REF(inp);
2781                                 return (NULL);
2782                         }
2783                         SCTP_INP_DECR_REF(inp);
2784                         /* Switch over to the new guy */
2785                         *inp_p = inp;
2786                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2787                         if (send_int_conf) {
2788                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2789                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2790                         }
2791                         /*
2792                          * Pull it from the incomplete queue and wake the
2793                          * guy
2794                          */
2795 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2796                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2797                         SCTP_TCB_UNLOCK((*stcb));
2798                         SCTP_SOCKET_LOCK(so, 1);
2799 #endif
2800                         soisconnected(so);
2801 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2802                         SCTP_TCB_LOCK((*stcb));
2803                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2804                         SCTP_SOCKET_UNLOCK(so, 1);
2805 #endif
2806                         return (m);
2807                 }
2808         }
2809         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) {
2810                 if (notification) {
2811                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2812                 }
2813                 if (send_int_conf) {
2814                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2815                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2816                 }
2817         }
2818         return (m);
2819 }
2820
2821 static void
2822 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp,
2823     struct sctp_tcb *stcb, struct sctp_nets *net)
2824 {
2825         /* cp must not be used, others call this without a c-ack :-) */
2826         struct sctp_association *asoc;
2827
2828         SCTPDBG(SCTP_DEBUG_INPUT2,
2829             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2830         if (stcb == NULL)
2831                 return;
2832
2833         asoc = &stcb->asoc;
2834
2835         sctp_stop_all_cookie_timers(stcb);
2836         /* process according to association state */
2837         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
2838                 /* state change only needed when I am in right state */
2839                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2840                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2841                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2842                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2843                             stcb->sctp_ep, stcb, asoc->primary_destination);
2844
2845                 }
2846                 /* update RTO */
2847                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2848                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2849                 if (asoc->overall_error_count == 0) {
2850                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
2851                             &asoc->time_entered, sctp_align_safe_nocopy,
2852                             SCTP_DETERMINE_LL_NOTOK);
2853                 }
2854                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2855                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2856                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2857                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2858 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2859                         struct socket *so;
2860
2861 #endif
2862                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2863 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2864                         so = SCTP_INP_SO(stcb->sctp_ep);
2865                         atomic_add_int(&stcb->asoc.refcnt, 1);
2866                         SCTP_TCB_UNLOCK(stcb);
2867                         SCTP_SOCKET_LOCK(so, 1);
2868                         SCTP_TCB_LOCK(stcb);
2869                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2870 #endif
2871                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
2872                                 soisconnected(stcb->sctp_socket);
2873                         }
2874 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2875                         SCTP_SOCKET_UNLOCK(so, 1);
2876 #endif
2877                 }
2878                 /*
2879                  * since we did not send a HB make sure we don't double
2880                  * things
2881                  */
2882                 net->hb_responded = 1;
2883
2884                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2885                         /*
2886                          * We don't need to do the asconf thing, nor hb or
2887                          * autoclose if the socket is closed.
2888                          */
2889                         goto closed_socket;
2890                 }
2891                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2892                     stcb, net);
2893
2894
2895                 if (stcb->asoc.sctp_autoclose_ticks &&
2896                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2897                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2898                             stcb->sctp_ep, stcb, NULL);
2899                 }
2900                 /*
2901                  * send ASCONF if parameters are pending and ASCONFs are
2902                  * allowed (eg. addresses changed when init/cookie echo were
2903                  * in flight)
2904                  */
2905                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2906                     (stcb->asoc.peer_supports_asconf) &&
2907                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2908 #ifdef SCTP_TIMER_BASED_ASCONF
2909                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2910                             stcb->sctp_ep, stcb,
2911                             stcb->asoc.primary_destination);
2912 #else
2913                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2914                             SCTP_ADDR_NOT_LOCKED);
2915 #endif
2916                 }
2917         }
2918 closed_socket:
2919         /* Toss the cookie if I can */
2920         sctp_toss_old_cookies(stcb, asoc);
2921         if (!TAILQ_EMPTY(&asoc->sent_queue)) {
2922                 /* Restart the timer if we have pending data */
2923                 struct sctp_tmit_chunk *chk;
2924
2925                 chk = TAILQ_FIRST(&asoc->sent_queue);
2926                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
2927         }
2928 }
2929
2930 static void
2931 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
2932     struct sctp_tcb *stcb)
2933 {
2934         struct sctp_nets *net;
2935         struct sctp_tmit_chunk *lchk;
2936         struct sctp_ecne_chunk bkup;
2937         uint8_t override_bit = 0;
2938         uint32_t tsn, window_data_tsn;
2939         int len;
2940         unsigned int pkt_cnt;
2941
2942         len = ntohs(cp->ch.chunk_length);
2943         if ((len != sizeof(struct sctp_ecne_chunk)) &&
2944             (len != sizeof(struct old_sctp_ecne_chunk))) {
2945                 return;
2946         }
2947         if (len == sizeof(struct old_sctp_ecne_chunk)) {
2948                 /* Its the old format */
2949                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
2950                 bkup.num_pkts_since_cwr = htonl(1);
2951                 cp = &bkup;
2952         }
2953         SCTP_STAT_INCR(sctps_recvecne);
2954         tsn = ntohl(cp->tsn);
2955         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
2956         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
2957         if (lchk == NULL) {
2958                 window_data_tsn = stcb->asoc.sending_seq - 1;
2959         } else {
2960                 window_data_tsn = lchk->rec.data.TSN_seq;
2961         }
2962
2963         /* Find where it was sent to if possible. */
2964         net = NULL;
2965         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
2966                 if (lchk->rec.data.TSN_seq == tsn) {
2967                         net = lchk->whoTo;
2968                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
2969                         break;
2970                 }
2971                 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) {
2972                         break;
2973                 }
2974         }
2975         if (net == NULL) {
2976                 /*
2977                  * What to do. A previous send of a CWR was possibly lost.
2978                  * See how old it is, we may have it marked on the actual
2979                  * net.
2980                  */
2981                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
2982                         if (tsn == net->last_cwr_tsn) {
2983                                 /* Found him, send it off */
2984                                 goto out;
2985                         }
2986                 }
2987                 /*
2988                  * If we reach here, we need to send a special CWR that says
2989                  * hey, we did this a long time ago and you lost the
2990                  * response.
2991                  */
2992                 net = TAILQ_FIRST(&stcb->asoc.nets);
2993                 override_bit = SCTP_CWR_REDUCE_OVERRIDE;
2994         }
2995 out:
2996         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
2997             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
2998                 /*
2999                  * JRS - Use the congestion control given in the pluggable
3000                  * CC module
3001                  */
3002                 int ocwnd;
3003
3004                 ocwnd = net->cwnd;
3005                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
3006                 /*
3007                  * We reduce once every RTT. So we will only lower cwnd at
3008                  * the next sending seq i.e. the window_data_tsn
3009                  */
3010                 net->cwr_window_tsn = window_data_tsn;
3011                 net->ecn_ce_pkt_cnt += pkt_cnt;
3012                 net->lost_cnt = pkt_cnt;
3013                 net->last_cwr_tsn = tsn;
3014         } else {
3015                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
3016                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
3017                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3018                         /*
3019                          * Another loss in the same window update how many
3020                          * marks/packets lost we have had.
3021                          */
3022                         int cnt = 1;
3023
3024                         if (pkt_cnt > net->lost_cnt) {
3025                                 /* Should be the case */
3026                                 cnt = (pkt_cnt - net->lost_cnt);
3027                                 net->ecn_ce_pkt_cnt += cnt;
3028                         }
3029                         net->lost_cnt = pkt_cnt;
3030                         net->last_cwr_tsn = tsn;
3031                         /*
3032                          * Most CC functions will ignore this call, since we
3033                          * are in-window yet of the initial CE the peer saw.
3034                          */
3035                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
3036                 }
3037         }
3038         /*
3039          * We always send a CWR this way if our previous one was lost our
3040          * peer will get an update, or if it is not time again to reduce we
3041          * still get the cwr to the peer. Note we set the override when we
3042          * could not find the TSN on the chunk or the destination network.
3043          */
3044         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
3045 }
3046
3047 static void
3048 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3049 {
3050         /*
3051          * Here we get a CWR from the peer. We must look in the outqueue and
3052          * make sure that we have a covered ECNE in teh control chunk part.
3053          * If so remove it.
3054          */
3055         struct sctp_tmit_chunk *chk;
3056         struct sctp_ecne_chunk *ecne;
3057         int override;
3058         uint32_t cwr_tsn;
3059
3060         cwr_tsn = ntohl(cp->tsn);
3061
3062         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3063         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
3064                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3065                         continue;
3066                 }
3067                 if ((override == 0) && (chk->whoTo != net)) {
3068                         /* Must be from the right src unless override is set */
3069                         continue;
3070                 }
3071                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3072                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3073                         /* this covers this ECNE, we can remove it */
3074                         stcb->asoc.ecn_echo_cnt_onq--;
3075                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3076                             sctp_next);
3077                         if (chk->data) {
3078                                 sctp_m_freem(chk->data);
3079                                 chk->data = NULL;
3080                         }
3081                         stcb->asoc.ctrl_queue_cnt--;
3082                         sctp_free_a_chunk(stcb, chk);
3083                         if (override == 0) {
3084                                 break;
3085                         }
3086                 }
3087         }
3088 }
3089
3090 static void
3091 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp,
3092     struct sctp_tcb *stcb, struct sctp_nets *net)
3093 {
3094         struct sctp_association *asoc;
3095
3096 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3097         struct socket *so;
3098
3099 #endif
3100
3101         SCTPDBG(SCTP_DEBUG_INPUT2,
3102             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3103         if (stcb == NULL)
3104                 return;
3105
3106         asoc = &stcb->asoc;
3107         /* process according to association state */
3108         if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3109                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3110                 SCTPDBG(SCTP_DEBUG_INPUT2,
3111                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3112                 SCTP_TCB_UNLOCK(stcb);
3113                 return;
3114         }
3115         /* notify upper layer protocol */
3116         if (stcb->sctp_socket) {
3117                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3118                 /* are the queues empty? they should be */
3119                 if (!TAILQ_EMPTY(&asoc->send_queue) ||
3120                     !TAILQ_EMPTY(&asoc->sent_queue) ||
3121                     !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
3122                         sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED);
3123                 }
3124         }
3125         /* stop the timer */
3126         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
3127         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3128         /* free the TCB */
3129         SCTPDBG(SCTP_DEBUG_INPUT2,
3130             "sctp_handle_shutdown_complete: calls free-asoc\n");
3131 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3132         so = SCTP_INP_SO(stcb->sctp_ep);
3133         atomic_add_int(&stcb->asoc.refcnt, 1);
3134         SCTP_TCB_UNLOCK(stcb);
3135         SCTP_SOCKET_LOCK(so, 1);
3136         SCTP_TCB_LOCK(stcb);
3137         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3138 #endif
3139         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
3140 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3141         SCTP_SOCKET_UNLOCK(so, 1);
3142 #endif
3143         return;
3144 }
3145
3146 static int
3147 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3148     struct sctp_nets *net, uint8_t flg)
3149 {
3150         switch (desc->chunk_type) {
3151         case SCTP_DATA:
3152                 /* find the tsn to resend (possibly */
3153                 {
3154                         uint32_t tsn;
3155                         struct sctp_tmit_chunk *tp1;
3156
3157                         tsn = ntohl(desc->tsn_ifany);
3158                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3159                                 if (tp1->rec.data.TSN_seq == tsn) {
3160                                         /* found it */
3161                                         break;
3162                                 }
3163                                 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) {
3164                                         /* not found */
3165                                         tp1 = NULL;
3166                                         break;
3167                                 }
3168                         }
3169                         if (tp1 == NULL) {
3170                                 /*
3171                                  * Do it the other way , aka without paying
3172                                  * attention to queue seq order.
3173                                  */
3174                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3175                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3176                                         if (tp1->rec.data.TSN_seq == tsn) {
3177                                                 /* found it */
3178                                                 break;
3179                                         }
3180                                 }
3181                         }
3182                         if (tp1 == NULL) {
3183                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3184                         }
3185                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3186                                 uint8_t *ddp;
3187
3188                                 if (((flg & SCTP_BADCRC) == 0) &&
3189                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3190                                         return (0);
3191                                 }
3192                                 if ((stcb->asoc.peers_rwnd == 0) &&
3193                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3194                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3195                                         return (0);
3196                                 }
3197                                 if (stcb->asoc.peers_rwnd == 0 &&
3198                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3199                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3200                                         return (0);
3201                                 }
3202                                 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+
3203                                     sizeof(struct sctp_data_chunk));
3204                                 {
3205                                         unsigned int iii;
3206
3207                                         for (iii = 0; iii < sizeof(desc->data_bytes);
3208                                             iii++) {
3209                                                 if (ddp[iii] != desc->data_bytes[iii]) {
3210                                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3211                                                         return (-1);
3212                                                 }
3213                                         }
3214                                 }
3215
3216                                 if (tp1->do_rtt) {
3217                                         /*
3218                                          * this guy had a RTO calculation
3219                                          * pending on it, cancel it
3220                                          */
3221                                         tp1->do_rtt = 0;
3222                                 }
3223                                 SCTP_STAT_INCR(sctps_pdrpmark);
3224                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3225                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3226                                 /*
3227                                  * mark it as if we were doing a FR, since
3228                                  * we will be getting gap ack reports behind
3229                                  * the info from the router.
3230                                  */
3231                                 tp1->rec.data.doing_fast_retransmit = 1;
3232                                 /*
3233                                  * mark the tsn with what sequences can
3234                                  * cause a new FR.
3235                                  */
3236                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3237                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3238                                 } else {
3239                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
3240                                 }
3241
3242                                 /* restart the timer */
3243                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3244                                     stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3245                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3246                                     stcb, tp1->whoTo);
3247
3248                                 /* fix counts and things */
3249                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3250                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3251                                             tp1->whoTo->flight_size,
3252                                             tp1->book_size,
3253                                             (uintptr_t) stcb,
3254                                             tp1->rec.data.TSN_seq);
3255                                 }
3256                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3257                                         sctp_flight_size_decrease(tp1);
3258                                         sctp_total_flight_decrease(stcb, tp1);
3259                                 }
3260                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3261                         } {
3262                                 /* audit code */
3263                                 unsigned int audit;
3264
3265                                 audit = 0;
3266                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3267                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3268                                                 audit++;
3269                                 }
3270                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3271                                     sctp_next) {
3272                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3273                                                 audit++;
3274                                 }
3275                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3276                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3277                                             audit, stcb->asoc.sent_queue_retran_cnt);
3278 #ifndef SCTP_AUDITING_ENABLED
3279                                         stcb->asoc.sent_queue_retran_cnt = audit;
3280 #endif
3281                                 }
3282                         }
3283                 }
3284                 break;
3285         case SCTP_ASCONF:
3286                 {
3287                         struct sctp_tmit_chunk *asconf;
3288
3289                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3290                             sctp_next) {
3291                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3292                                         break;
3293                                 }
3294                         }
3295                         if (asconf) {
3296                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3297                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3298                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3299                                 asconf->snd_count--;
3300                         }
3301                 }
3302                 break;
3303         case SCTP_INITIATION:
3304                 /* resend the INIT */
3305                 stcb->asoc.dropped_special_cnt++;
3306                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3307                         /*
3308                          * If we can get it in, in a few attempts we do
3309                          * this, otherwise we let the timer fire.
3310                          */
3311                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3312                             stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3313                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3314                 }
3315                 break;
3316         case SCTP_SELECTIVE_ACK:
3317         case SCTP_NR_SELECTIVE_ACK:
3318                 /* resend the sack */
3319                 sctp_send_sack(stcb);
3320                 break;
3321         case SCTP_HEARTBEAT_REQUEST:
3322                 /* resend a demand HB */
3323                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3324                         /*
3325                          * Only retransmit if we KNOW we wont destroy the
3326                          * tcb
3327                          */
3328                         (void)sctp_send_hb(stcb, 1, net);
3329                 }
3330                 break;
3331         case SCTP_SHUTDOWN:
3332                 sctp_send_shutdown(stcb, net);
3333                 break;
3334         case SCTP_SHUTDOWN_ACK:
3335                 sctp_send_shutdown_ack(stcb, net);
3336                 break;
3337         case SCTP_COOKIE_ECHO:
3338                 {
3339                         struct sctp_tmit_chunk *cookie;
3340
3341                         cookie = NULL;
3342                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3343                             sctp_next) {
3344                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3345                                         break;
3346                                 }
3347                         }
3348                         if (cookie) {
3349                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3350                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3351                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3352                                 sctp_stop_all_cookie_timers(stcb);
3353                         }
3354                 }
3355                 break;
3356         case SCTP_COOKIE_ACK:
3357                 sctp_send_cookie_ack(stcb);
3358                 break;
3359         case SCTP_ASCONF_ACK:
3360                 /* resend last asconf ack */
3361                 sctp_send_asconf_ack(stcb);
3362                 break;
3363         case SCTP_FORWARD_CUM_TSN:
3364                 send_forward_tsn(stcb, &stcb->asoc);
3365                 break;
3366                 /* can't do anything with these */
3367         case SCTP_PACKET_DROPPED:
3368         case SCTP_INITIATION_ACK:       /* this should not happen */
3369         case SCTP_HEARTBEAT_ACK:
3370         case SCTP_ABORT_ASSOCIATION:
3371         case SCTP_OPERATION_ERROR:
3372         case SCTP_SHUTDOWN_COMPLETE:
3373         case SCTP_ECN_ECHO:
3374         case SCTP_ECN_CWR:
3375         default:
3376                 break;
3377         }
3378         return (0);
3379 }
3380
3381 void
3382 sctp_reset_in_stream(struct sctp_tcb *stcb, int number_entries, uint16_t * list)
3383 {
3384         int i;
3385         uint16_t temp;
3386
3387         /*
3388          * We set things to 0xffff since this is the last delivered sequence
3389          * and we will be sending in 0 after the reset.
3390          */
3391
3392         if (number_entries) {
3393                 for (i = 0; i < number_entries; i++) {
3394                         temp = ntohs(list[i]);
3395                         if (temp >= stcb->asoc.streamincnt) {
3396                                 continue;
3397                         }
3398                         stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff;
3399                 }
3400         } else {
3401                 list = NULL;
3402                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3403                         stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3404                 }
3405         }
3406         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3407 }
3408
3409 static void
3410 sctp_reset_out_streams(struct sctp_tcb *stcb, int number_entries, uint16_t * list)
3411 {
3412         int i;
3413
3414         if (number_entries == 0) {
3415                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3416                         stcb->asoc.strmout[i].next_sequence_sent = 0;
3417                 }
3418         } else if (number_entries) {
3419                 for (i = 0; i < number_entries; i++) {
3420                         uint16_t temp;
3421
3422                         temp = ntohs(list[i]);
3423                         if (temp >= stcb->asoc.streamoutcnt) {
3424                                 /* no such stream */
3425                                 continue;
3426                         }
3427                         stcb->asoc.strmout[temp].next_sequence_sent = 0;
3428                 }
3429         }
3430         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3431 }
3432
3433
3434 struct sctp_stream_reset_out_request *
3435 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3436 {
3437         struct sctp_association *asoc;
3438         struct sctp_stream_reset_out_req *req;
3439         struct sctp_stream_reset_out_request *r;
3440         struct sctp_tmit_chunk *chk;
3441         int len, clen;
3442
3443         asoc = &stcb->asoc;
3444         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3445                 asoc->stream_reset_outstanding = 0;
3446                 return (NULL);
3447         }
3448         if (stcb->asoc.str_reset == NULL) {
3449                 asoc->stream_reset_outstanding = 0;
3450                 return (NULL);
3451         }
3452         chk = stcb->asoc.str_reset;
3453         if (chk->data == NULL) {
3454                 return (NULL);
3455         }
3456         if (bchk) {
3457                 /* he wants a copy of the chk pointer */
3458                 *bchk = chk;
3459         }
3460         clen = chk->send_size;
3461         req = mtod(chk->data, struct sctp_stream_reset_out_req *);
3462         r = &req->sr_req;
3463         if (ntohl(r->request_seq) == seq) {
3464                 /* found it */
3465                 return (r);
3466         }
3467         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3468         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3469                 /* move to the next one, there can only be a max of two */
3470                 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len);
3471                 if (ntohl(r->request_seq) == seq) {
3472                         return (r);
3473                 }
3474         }
3475         /* that seq is not here */
3476         return (NULL);
3477 }
3478
3479 static void
3480 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3481 {
3482         struct sctp_association *asoc;
3483         struct sctp_tmit_chunk *chk = stcb->asoc.str_reset;
3484
3485         if (stcb->asoc.str_reset == NULL) {
3486                 return;
3487         }
3488         asoc = &stcb->asoc;
3489
3490         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3491         TAILQ_REMOVE(&asoc->control_send_queue,
3492             chk,
3493             sctp_next);
3494         if (chk->data) {
3495                 sctp_m_freem(chk->data);
3496                 chk->data = NULL;
3497         }
3498         asoc->ctrl_queue_cnt--;
3499         sctp_free_a_chunk(stcb, chk);
3500         /* sa_ignore NO_NULL_CHK */
3501         stcb->asoc.str_reset = NULL;
3502 }
3503
3504
3505 static int
3506 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3507     uint32_t seq, uint32_t action,
3508     struct sctp_stream_reset_response *respin)
3509 {
3510         uint16_t type;
3511         int lparm_len;
3512         struct sctp_association *asoc = &stcb->asoc;
3513         struct sctp_tmit_chunk *chk;
3514         struct sctp_stream_reset_out_request *srparam;
3515         int number_entries;
3516
3517         if (asoc->stream_reset_outstanding == 0) {
3518                 /* duplicate */
3519                 return (0);
3520         }
3521         if (seq == stcb->asoc.str_reset_seq_out) {
3522                 srparam = sctp_find_stream_reset(stcb, seq, &chk);
3523                 if (srparam) {
3524                         stcb->asoc.str_reset_seq_out++;
3525                         type = ntohs(srparam->ph.param_type);
3526                         lparm_len = ntohs(srparam->ph.param_length);
3527                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3528                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3529                                 asoc->stream_reset_out_is_outstanding = 0;
3530                                 if (asoc->stream_reset_outstanding)
3531                                         asoc->stream_reset_outstanding--;
3532                                 if (action == SCTP_STREAM_RESET_PERFORMED) {
3533                                         /* do it */
3534                                         sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams);
3535                                 } else {
3536                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3537                                 }
3538                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3539                                 /* Answered my request */
3540                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3541                                 if (asoc->stream_reset_outstanding)
3542                                         asoc->stream_reset_outstanding--;
3543                                 if (action != SCTP_STREAM_RESET_PERFORMED) {
3544                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3545                                 }
3546                         } else if (type == SCTP_STR_RESET_ADD_STREAMS) {
3547                                 /* Ok we now may have more streams */
3548                                 if (asoc->stream_reset_outstanding)
3549                                         asoc->stream_reset_outstanding--;
3550                                 if (action == SCTP_STREAM_RESET_PERFORMED) {
3551                                         /* Put the new streams into effect */
3552                                         stcb->asoc.streamoutcnt = stcb->asoc.strm_realoutsize;
3553                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD_OK, stcb,
3554                                             (uint32_t) stcb->asoc.streamoutcnt, NULL, SCTP_SO_NOT_LOCKED);
3555                                 } else {
3556                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD_FAIL, stcb,
3557                                             (uint32_t) stcb->asoc.streamoutcnt, NULL, SCTP_SO_NOT_LOCKED);
3558                                 }
3559                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3560                                 /**
3561                                  * a) Adopt the new in tsn.
3562                                  * b) reset the map
3563                                  * c) Adopt the new out-tsn
3564                                  */
3565                                 struct sctp_stream_reset_response_tsn *resp;
3566                                 struct sctp_forward_tsn_chunk fwdtsn;
3567                                 int abort_flag = 0;
3568
3569                                 if (respin == NULL) {
3570                                         /* huh ? */
3571                                         return (0);
3572                                 }
3573                                 if (action == SCTP_STREAM_RESET_PERFORMED) {
3574                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3575                                         asoc->stream_reset_outstanding--;
3576                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3577                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3578                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3579                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3580                                         if (abort_flag) {
3581                                                 return (1);
3582                                         }
3583                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3584                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3585                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3586                                         }
3587                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3588                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3589                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3590
3591                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3592                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3593
3594                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3595                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3596
3597                                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3598                                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3599
3600                                 }
3601                         }
3602                         /* get rid of the request and get the request flags */
3603                         if (asoc->stream_reset_outstanding == 0) {
3604                                 sctp_clean_up_stream_reset(stcb);
3605                         }
3606                 }
3607         }
3608         return (0);
3609 }
3610
3611 static void
3612 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3613     struct sctp_tmit_chunk *chk,
3614     struct sctp_stream_reset_in_request *req, int trunc)
3615 {
3616         uint32_t seq;
3617         int len, i;
3618         int number_entries;
3619         uint16_t temp;
3620
3621         /*
3622          * peer wants me to send a str-reset to him for my outgoing seq's if
3623          * seq_in is right.
3624          */
3625         struct sctp_association *asoc = &stcb->asoc;
3626
3627         seq = ntohl(req->request_seq);
3628         if (asoc->str_reset_seq_in == seq) {
3629                 if (trunc) {
3630                         /* Can't do it, since they exceeded our buffer size  */
3631                         asoc->last_reset_action[1] = asoc->last_reset_action[0];
3632                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
3633                         sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3634                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3635                         len = ntohs(req->ph.param_length);
3636                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3637                         for (i = 0; i < number_entries; i++) {
3638                                 temp = ntohs(req->list_of_streams[i]);
3639                                 req->list_of_streams[i] = temp;
3640                         }
3641                         /* move the reset action back one */
3642                         asoc->last_reset_action[1] = asoc->last_reset_action[0];
3643                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3644                         sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams,
3645                             asoc->str_reset_seq_out,
3646                             seq, (asoc->sending_seq - 1));
3647                         asoc->stream_reset_out_is_outstanding = 1;
3648                         asoc->str_reset = chk;
3649                         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
3650                         stcb->asoc.stream_reset_outstanding++;
3651                 } else {
3652                         /* Can't do it, since we have sent one out */
3653                         asoc->last_reset_action[1] = asoc->last_reset_action[0];
3654                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_TRY_LATER;
3655                         sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3656                 }
3657                 asoc->str_reset_seq_in++;
3658         } else if (asoc->str_reset_seq_in - 1 == seq) {
3659                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3660         } else if (asoc->str_reset_seq_in - 2 == seq) {
3661                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3662         } else {
3663                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
3664         }
3665 }
3666
3667 static int
3668 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3669     struct sctp_tmit_chunk *chk,
3670     struct sctp_stream_reset_tsn_request *req)
3671 {
3672         /* reset all in and out and update the tsn */
3673         /*
3674          * A) reset my str-seq's on in and out. B) Select a receive next,
3675          * and set cum-ack to it. Also process this selected number as a
3676          * fwd-tsn as well. C) set in the response my next sending seq.
3677          */
3678         struct sctp_forward_tsn_chunk fwdtsn;
3679         struct sctp_association *asoc = &stcb->asoc;
3680         int abort_flag = 0;
3681         uint32_t seq;
3682
3683         seq = ntohl(req->request_seq);
3684         if (asoc->str_reset_seq_in == seq) {
3685                 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3686                 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3687                 fwdtsn.ch.chunk_flags = 0;
3688                 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3689                 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3690                 if (abort_flag) {
3691                         return (1);
3692                 }
3693                 stcb->asoc.highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3694                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3695                         sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3696                 }
3697                 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3698                 stcb->asoc.mapping_array_base_tsn = stcb->asoc.highest_tsn_inside_map + 1;
3699                 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3700                 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3701                 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3702                 atomic_add_int(&stcb->asoc.sending_seq, 1);
3703                 /* save off historical data for retrans */
3704                 stcb->asoc.last_sending_seq[1] = stcb->asoc.last_sending_seq[0];
3705                 stcb->asoc.last_sending_seq[0] = stcb->asoc.sending_seq;
3706                 stcb->asoc.last_base_tsnsent[1] = stcb->asoc.last_base_tsnsent[0];
3707                 stcb->asoc.last_base_tsnsent[0] = stcb->asoc.mapping_array_base_tsn;
3708
3709                 sctp_add_stream_reset_result_tsn(chk,
3710                     ntohl(req->request_seq),
3711                     SCTP_STREAM_RESET_PERFORMED,
3712                     stcb->asoc.sending_seq,
3713                     stcb->asoc.mapping_array_base_tsn);
3714                 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3715                 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3716                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3717                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3718
3719                 asoc->str_reset_seq_in++;
3720         } else if (asoc->str_reset_seq_in - 1 == seq) {
3721                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3722                     stcb->asoc.last_sending_seq[0],
3723                     stcb->asoc.last_base_tsnsent[0]
3724                     );
3725         } else if (asoc->str_reset_seq_in - 2 == seq) {
3726                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3727                     stcb->asoc.last_sending_seq[1],
3728                     stcb->asoc.last_base_tsnsent[1]
3729                     );
3730         } else {
3731                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
3732         }
3733         return (0);
3734 }
3735
3736 static void
3737 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3738     struct sctp_tmit_chunk *chk,
3739     struct sctp_stream_reset_out_request *req, int trunc)
3740 {
3741         uint32_t seq, tsn;
3742         int number_entries, len;
3743         struct sctp_association *asoc = &stcb->asoc;
3744
3745         seq = ntohl(req->request_seq);
3746
3747         /* now if its not a duplicate we process it */
3748         if (asoc->str_reset_seq_in == seq) {
3749                 len = ntohs(req->ph.param_length);
3750                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3751                 /*
3752                  * the sender is resetting, handle the list issue.. we must
3753                  * a) verify if we can do the reset, if so no problem b) If
3754                  * we can't do the reset we must copy the request. c) queue
3755                  * it, and setup the data in processor to trigger it off
3756                  * when needed and dequeue all the queued data.
3757                  */
3758                 tsn = ntohl(req->send_reset_at_tsn);
3759
3760                 /* move the reset action back one */
3761                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3762                 if (trunc) {
3763                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED);
3764                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
3765                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3766                         /* we can do it now */
3767                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3768                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED);
3769                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3770                 } else {
3771                         /*
3772                          * we must queue it up and thus wait for the TSN's
3773                          * to arrive that are at or before tsn
3774                          */
3775                         struct sctp_stream_reset_list *liste;
3776                         int siz;
3777
3778                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3779                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3780                             siz, SCTP_M_STRESET);
3781                         if (liste == NULL) {
3782                                 /* gak out of memory */
3783                                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED);
3784                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
3785                                 return;
3786                         }
3787                         liste->tsn = tsn;
3788                         liste->number_entries = number_entries;
3789                         memcpy(&liste->req, req,
3790                             (sizeof(struct sctp_stream_reset_out_request) + (number_entries * sizeof(uint16_t))));
3791                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3792                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED);
3793                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3794                 }
3795                 asoc->str_reset_seq_in++;
3796         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3797                 /*
3798                  * one seq back, just echo back last action since my
3799                  * response was lost.
3800                  */
3801                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3802         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3803                 /*
3804                  * two seq back, just echo back last action since my
3805                  * response was lost.
3806                  */
3807                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3808         } else {
3809                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
3810         }
3811 }
3812
3813 static void
3814 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3815     struct sctp_stream_reset_add_strm *str_add)
3816 {
3817         /*
3818          * Peer is requesting to add more streams. If its within our
3819          * max-streams we will allow it.
3820          */
3821         uint16_t num_stream, i;
3822         uint32_t seq;
3823         struct sctp_association *asoc = &stcb->asoc;
3824         struct sctp_queued_to_read *ctl, *nctl;
3825
3826         /* Get the number. */
3827         seq = ntohl(str_add->request_seq);
3828         num_stream = ntohs(str_add->number_of_streams);
3829         /* Now what would be the new total? */
3830         if (asoc->str_reset_seq_in == seq) {
3831                 num_stream += stcb->asoc.streamincnt;
3832                 if (num_stream > stcb->asoc.max_inbound_streams) {
3833                         /* We must reject it they ask for to many */
3834         denied:
3835                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED);
3836                         stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3837                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
3838                 } else {
3839                         /* Ok, we can do that :-) */
3840                         struct sctp_stream_in *oldstrm;
3841
3842                         /* save off the old */
3843                         oldstrm = stcb->asoc.strmin;
3844                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
3845                             (num_stream * sizeof(struct sctp_stream_in)),
3846                             SCTP_M_STRMI);
3847                         if (stcb->asoc.strmin == NULL) {
3848                                 stcb->asoc.strmin = oldstrm;
3849                                 goto denied;
3850                         }
3851                         /* copy off the old data */
3852                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
3853                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3854                                 stcb->asoc.strmin[i].stream_no = i;
3855                                 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered;
3856                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
3857                                 /* now anything on those queues? */
3858                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) {
3859                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next);
3860                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next);
3861                                 }
3862                         }
3863                         /* Init the new streams */
3864                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
3865                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3866                                 stcb->asoc.strmin[i].stream_no = i;
3867                                 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3868                                 stcb->asoc.strmin[i].delivery_started = 0;
3869                         }
3870                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
3871                         /* update the size */
3872                         stcb->asoc.streamincnt = num_stream;
3873                         /* Send the ack */
3874                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED);
3875                         stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3876                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3877                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_INSTREAM_ADD_OK, stcb,
3878                             (uint32_t) stcb->asoc.streamincnt, NULL, SCTP_SO_NOT_LOCKED);
3879                 }
3880         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3881                 /*
3882                  * one seq back, just echo back last action since my
3883                  * response was lost.
3884                  */
3885                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3886         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3887                 /*
3888                  * two seq back, just echo back last action since my
3889                  * response was lost.
3890                  */
3891                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3892         } else {
3893                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
3894
3895         }
3896 }
3897
3898 #ifdef __GNUC__
3899 __attribute__((noinline))
3900 #endif
3901         static int
3902             sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
3903         struct sctp_stream_reset_out_req *sr_req)
3904 {
3905         int chk_length, param_len, ptype;
3906         struct sctp_paramhdr pstore;
3907         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
3908
3909         uint32_t seq;
3910         int num_req = 0;
3911         int trunc = 0;
3912         struct sctp_tmit_chunk *chk;
3913         struct sctp_chunkhdr *ch;
3914         struct sctp_paramhdr *ph;
3915         int ret_code = 0;
3916         int num_param = 0;
3917
3918         /* now it may be a reset or a reset-response */
3919         chk_length = ntohs(sr_req->ch.chunk_length);
3920
3921         /* setup for adding the response */
3922         sctp_alloc_a_chunk(stcb, chk);
3923         if (chk == NULL) {
3924                 return (ret_code);
3925         }
3926         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
3927         chk->rec.chunk_id.can_take_data = 0;
3928         chk->asoc = &stcb->asoc;
3929         chk->no_fr_allowed = 0;
3930         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
3931         chk->book_size_scale = 0;
3932         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
3933         if (chk->data == NULL) {
3934 strres_nochunk:
3935                 if (chk->data) {
3936                         sctp_m_freem(chk->data);
3937                         chk->data = NULL;
3938                 }
3939                 sctp_free_a_chunk(stcb, chk);
3940                 return (ret_code);
3941         }
3942         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
3943
3944         /* setup chunk parameters */
3945         chk->sent = SCTP_DATAGRAM_UNSENT;
3946         chk->snd_count = 0;
3947         chk->whoTo = stcb->asoc.primary_destination;
3948         atomic_add_int(&chk->whoTo->ref_count, 1);
3949
3950         ch = mtod(chk->data, struct sctp_chunkhdr *);
3951         ch->chunk_type = SCTP_STREAM_RESET;
3952         ch->chunk_flags = 0;
3953         ch->chunk_length = htons(chk->send_size);
3954         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
3955         offset += sizeof(struct sctp_chunkhdr);
3956         while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) {
3957                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore);
3958                 if (ph == NULL)
3959                         break;
3960                 param_len = ntohs(ph->param_length);
3961                 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) {
3962                         /* bad param */
3963                         break;
3964                 }
3965                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)),
3966                     (uint8_t *) & cstore);
3967                 ptype = ntohs(ph->param_type);
3968                 num_param++;
3969                 if (param_len > (int)sizeof(cstore)) {
3970                         trunc = 1;
3971                 } else {
3972                         trunc = 0;
3973                 }
3974
3975                 if (num_param > SCTP_MAX_RESET_PARAMS) {
3976                         /* hit the max of parameters already sorry.. */
3977                         break;
3978                 }
3979                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
3980                         struct sctp_stream_reset_out_request *req_out;
3981
3982                         req_out = (struct sctp_stream_reset_out_request *)ph;
3983                         num_req++;
3984                         if (stcb->asoc.stream_reset_outstanding) {
3985                                 seq = ntohl(req_out->response_seq);
3986                                 if (seq == stcb->asoc.str_reset_seq_out) {
3987                                         /* implicit ack */
3988                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_PERFORMED, NULL);
3989                                 }
3990                         }
3991                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
3992                 } else if (ptype == SCTP_STR_RESET_ADD_STREAMS) {
3993                         struct sctp_stream_reset_add_strm *str_add;
3994
3995                         str_add = (struct sctp_stream_reset_add_strm *)ph;
3996                         num_req++;
3997                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
3998                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
3999                         struct sctp_stream_reset_in_request *req_in;
4000
4001                         num_req++;
4002
4003                         req_in = (struct sctp_stream_reset_in_request *)ph;
4004
4005                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4006                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4007                         struct sctp_stream_reset_tsn_request *req_tsn;
4008
4009                         num_req++;
4010                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4011
4012                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4013                                 ret_code = 1;
4014                                 goto strres_nochunk;
4015                         }
4016                         /* no more */
4017                         break;
4018                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4019                         struct sctp_stream_reset_response *resp;
4020                         uint32_t result;
4021
4022                         resp = (struct sctp_stream_reset_response *)ph;
4023                         seq = ntohl(resp->response_seq);
4024                         result = ntohl(resp->result);
4025                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4026                                 ret_code = 1;
4027                                 goto strres_nochunk;
4028                         }
4029                 } else {
4030                         break;
4031                 }
4032                 offset += SCTP_SIZE32(param_len);
4033                 chk_length -= SCTP_SIZE32(param_len);
4034         }
4035         if (num_req == 0) {
4036                 /* we have no response free the stuff */
4037                 goto strres_nochunk;
4038         }
4039         /* ok we have a chunk to link in */
4040         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4041             chk,
4042             sctp_next);
4043         stcb->asoc.ctrl_queue_cnt++;
4044         return (ret_code);
4045 }
4046
4047 /*
4048  * Handle a router or endpoints report of a packet loss, there are two ways
4049  * to handle this, either we get the whole packet and must disect it
4050  * ourselves (possibly with truncation and or corruption) or it is a summary
4051  * from a middle box that did the disectting for us.
4052  */
4053 static void
4054 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4055     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4056 {
4057         uint32_t bottle_bw, on_queue;
4058         uint16_t trunc_len;
4059         unsigned int chlen;
4060         unsigned int at;
4061         struct sctp_chunk_desc desc;
4062         struct sctp_chunkhdr *ch;
4063
4064         chlen = ntohs(cp->ch.chunk_length);
4065         chlen -= sizeof(struct sctp_pktdrop_chunk);
4066         /* XXX possible chlen underflow */
4067         if (chlen == 0) {
4068                 ch = NULL;
4069                 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
4070                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4071         } else {
4072                 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
4073                 chlen -= sizeof(struct sctphdr);
4074                 /* XXX possible chlen underflow */
4075                 memset(&desc, 0, sizeof(desc));
4076         }
4077         trunc_len = (uint16_t) ntohs(cp->trunc_len);
4078         if (trunc_len > limit) {
4079                 trunc_len = limit;
4080         }
4081         /* now the chunks themselves */
4082         while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
4083                 desc.chunk_type = ch->chunk_type;
4084                 /* get amount we need to move */
4085                 at = ntohs(ch->chunk_length);
4086                 if (at < sizeof(struct sctp_chunkhdr)) {
4087                         /* corrupt chunk, maybe at the end? */
4088                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4089                         break;
4090                 }
4091                 if (trunc_len == 0) {
4092                         /* we are supposed to have all of it */
4093                         if (at > chlen) {
4094                                 /* corrupt skip it */
4095                                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4096                                 break;
4097                         }
4098                 } else {
4099                         /* is there enough of it left ? */
4100                         if (desc.chunk_type == SCTP_DATA) {
4101                                 if (chlen < (sizeof(struct sctp_data_chunk) +
4102                                     sizeof(desc.data_bytes))) {
4103                                         break;
4104                                 }
4105                         } else {
4106                                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4107                                         break;
4108                                 }
4109                         }
4110                 }
4111                 if (desc.chunk_type == SCTP_DATA) {
4112                         /* can we get out the tsn? */
4113                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4114                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4115
4116                         if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
4117                                 /* yep */
4118                                 struct sctp_data_chunk *dcp;
4119                                 uint8_t *ddp;
4120                                 unsigned int iii;
4121
4122                                 dcp = (struct sctp_data_chunk *)ch;
4123                                 ddp = (uint8_t *) (dcp + 1);
4124                                 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
4125                                         desc.data_bytes[iii] = ddp[iii];
4126                                 }
4127                                 desc.tsn_ifany = dcp->dp.tsn;
4128                         } else {
4129                                 /* nope we are done. */
4130                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4131                                 break;
4132                         }
4133                 } else {
4134                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4135                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4136                 }
4137
4138                 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
4139                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4140                         break;
4141                 }
4142                 if (SCTP_SIZE32(at) > chlen) {
4143                         break;
4144                 }
4145                 chlen -= SCTP_SIZE32(at);
4146                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4147                         /* done, none left */
4148                         break;
4149                 }
4150                 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
4151         }
4152         /* Now update any rwnd --- possibly */
4153         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4154                 /* From a peer, we get a rwnd report */
4155                 uint32_t a_rwnd;
4156
4157                 SCTP_STAT_INCR(sctps_pdrpfehos);
4158
4159                 bottle_bw = ntohl(cp->bottle_bw);
4160                 on_queue = ntohl(cp->current_onq);
4161                 if (bottle_bw && on_queue) {
4162                         /* a rwnd report is in here */
4163                         if (bottle_bw > on_queue)
4164                                 a_rwnd = bottle_bw - on_queue;
4165                         else
4166                                 a_rwnd = 0;
4167
4168                         if (a_rwnd == 0)
4169                                 stcb->asoc.peers_rwnd = 0;
4170                         else {
4171                                 if (a_rwnd > stcb->asoc.total_flight) {
4172                                         stcb->asoc.peers_rwnd =
4173                                             a_rwnd - stcb->asoc.total_flight;
4174                                 } else {
4175                                         stcb->asoc.peers_rwnd = 0;
4176                                 }
4177                                 if (stcb->asoc.peers_rwnd <
4178                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4179                                         /* SWS sender side engages */
4180                                         stcb->asoc.peers_rwnd = 0;
4181                                 }
4182                         }
4183                 }
4184         } else {
4185                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4186         }
4187
4188         /* now middle boxes in sat networks get a cwnd bump */
4189         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
4190             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4191             (stcb->asoc.sat_network)) {
4192                 /*
4193                  * This is debateable but for sat networks it makes sense
4194                  * Note if a T3 timer has went off, we will prohibit any
4195                  * changes to cwnd until we exit the t3 loss recovery.
4196                  */
4197                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4198                     net, cp, &bottle_bw, &on_queue);
4199         }
4200 }
4201
4202 /*
4203  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4204  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4205  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4206  * length of the complete packet outputs: - length: modified to remaining
4207  * length after control processing - netp: modified to new sctp_nets after
4208  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4209  * bad packet,...) otherwise return the tcb for this packet
4210  */
4211 #ifdef __GNUC__
4212 __attribute__((noinline))
4213 #endif
4214         static struct sctp_tcb *
4215                  sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4216              struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4217              struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4218              uint32_t vrf_id, uint16_t port)
4219 {
4220         struct sctp_association *asoc;
4221         uint32_t vtag_in;
4222         int num_chunks = 0;     /* number of control chunks processed */
4223         uint32_t chk_length;
4224         int ret;
4225         int abort_no_unlock = 0;
4226         int ecne_seen = 0;
4227
4228         /*
4229          * How big should this be, and should it be alloc'd? Lets try the
4230          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4231          * until we get into jumbo grams and such..
4232          */
4233         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4234         struct sctp_tcb *locked_tcb = stcb;
4235         int got_auth = 0;
4236         uint32_t auth_offset = 0, auth_len = 0;
4237         int auth_skipped = 0;
4238         int asconf_cnt = 0;
4239
4240 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4241         struct socket *so;
4242
4243 #endif
4244
4245         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4246             iphlen, *offset, length, stcb);
4247
4248         /* validate chunk header length... */
4249         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4250                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4251                     ntohs(ch->chunk_length));
4252                 if (locked_tcb) {
4253                         SCTP_TCB_UNLOCK(locked_tcb);
4254                 }
4255                 return (NULL);
4256         }
4257         /*
4258          * validate the verification tag
4259          */
4260         vtag_in = ntohl(sh->v_tag);
4261
4262         if (locked_tcb) {
4263                 SCTP_TCB_LOCK_ASSERT(locked_tcb);
4264         }
4265         if (ch->chunk_type == SCTP_INITIATION) {
4266                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4267                     ntohs(ch->chunk_length), vtag_in);
4268                 if (vtag_in != 0) {
4269                         /* protocol error- silently discard... */
4270                         SCTP_STAT_INCR(sctps_badvtag);
4271                         if (locked_tcb) {
4272                                 SCTP_TCB_UNLOCK(locked_tcb);
4273                         }
4274                         return (NULL);
4275                 }
4276         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4277                 /*
4278                  * If there is no stcb, skip the AUTH chunk and process
4279                  * later after a stcb is found (to validate the lookup was
4280                  * valid.
4281                  */
4282                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4283                     (stcb == NULL) &&
4284                     !SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4285                         /* save this chunk for later processing */
4286                         auth_skipped = 1;
4287                         auth_offset = *offset;
4288                         auth_len = ntohs(ch->chunk_length);
4289
4290                         /* (temporarily) move past this chunk */
4291                         *offset += SCTP_SIZE32(auth_len);
4292                         if (*offset >= length) {
4293                                 /* no more data left in the mbuf chain */
4294                                 *offset = length;
4295                                 if (locked_tcb) {
4296                                         SCTP_TCB_UNLOCK(locked_tcb);
4297                                 }
4298                                 return (NULL);
4299                         }
4300                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4301                             sizeof(struct sctp_chunkhdr), chunk_buf);
4302                 }
4303                 if (ch == NULL) {
4304                         /* Help */
4305                         *offset = length;
4306                         if (locked_tcb) {
4307                                 SCTP_TCB_UNLOCK(locked_tcb);
4308                         }
4309                         return (NULL);
4310                 }
4311                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4312                         goto process_control_chunks;
4313                 }
4314                 /*
4315                  * first check if it's an ASCONF with an unknown src addr we
4316                  * need to look inside to find the association
4317                  */
4318                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4319                         struct sctp_chunkhdr *asconf_ch = ch;
4320                         uint32_t asconf_offset = 0, asconf_len = 0;
4321
4322                         /* inp's refcount may be reduced */
4323                         SCTP_INP_INCR_REF(inp);
4324
4325                         asconf_offset = *offset;
4326                         do {
4327                                 asconf_len = ntohs(asconf_ch->chunk_length);
4328                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4329                                         break;
4330                                 stcb = sctp_findassociation_ep_asconf(m, iphlen,
4331                                     *offset, sh, &inp, netp, vrf_id);
4332                                 if (stcb != NULL)
4333                                         break;
4334                                 asconf_offset += SCTP_SIZE32(asconf_len);
4335                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4336                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4337                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4338                         if (stcb == NULL) {
4339                                 /*
4340                                  * reduce inp's refcount if not reduced in
4341                                  * sctp_findassociation_ep_asconf().
4342                                  */
4343                                 SCTP_INP_DECR_REF(inp);
4344                         } else {
4345                                 locked_tcb = stcb;
4346                         }
4347
4348                         /* now go back and verify any auth chunk to be sure */
4349                         if (auth_skipped && (stcb != NULL)) {
4350                                 struct sctp_auth_chunk *auth;
4351
4352                                 auth = (struct sctp_auth_chunk *)
4353                                     sctp_m_getptr(m, auth_offset,
4354                                     auth_len, chunk_buf);
4355                                 got_auth = 1;
4356                                 auth_skipped = 0;
4357                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4358                                     auth_offset)) {
4359                                         /* auth HMAC failed so dump it */
4360                                         *offset = length;
4361                                         if (locked_tcb) {
4362                                                 SCTP_TCB_UNLOCK(locked_tcb);
4363                                         }
4364                                         return (NULL);
4365                                 } else {
4366                                         /* remaining chunks are HMAC checked */
4367                                         stcb->asoc.authenticated = 1;
4368                                 }
4369                         }
4370                 }
4371                 if (stcb == NULL) {
4372                         /* no association, so it's out of the blue... */
4373                         sctp_handle_ootb(m, iphlen, *offset, sh, inp, NULL,
4374                             vrf_id, port);
4375                         *offset = length;
4376                         if (locked_tcb) {
4377                                 SCTP_TCB_UNLOCK(locked_tcb);
4378                         }
4379                         return (NULL);
4380                 }
4381                 asoc = &stcb->asoc;
4382                 /* ABORT and SHUTDOWN can use either v_tag... */
4383                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4384                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4385                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4386                         if ((vtag_in == asoc->my_vtag) ||
4387                             ((ch->chunk_flags & SCTP_HAD_NO_TCB) &&
4388                             (vtag_in == asoc->peer_vtag))) {
4389                                 /* this is valid */
4390                         } else {
4391                                 /* drop this packet... */
4392                                 SCTP_STAT_INCR(sctps_badvtag);
4393                                 if (locked_tcb) {
4394                                         SCTP_TCB_UNLOCK(locked_tcb);
4395                                 }
4396                                 return (NULL);
4397                         }
4398                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4399                         if (vtag_in != asoc->my_vtag) {
4400                                 /*
4401                                  * this could be a stale SHUTDOWN-ACK or the
4402                                  * peer never got the SHUTDOWN-COMPLETE and
4403                                  * is still hung; we have started a new asoc
4404                                  * but it won't complete until the shutdown
4405                                  * is completed
4406                                  */
4407                                 if (locked_tcb) {
4408                                         SCTP_TCB_UNLOCK(locked_tcb);
4409                                 }
4410                                 sctp_handle_ootb(m, iphlen, *offset, sh, inp,
4411                                     NULL, vrf_id, port);
4412                                 return (NULL);
4413                         }
4414                 } else {
4415                         /* for all other chunks, vtag must match */
4416                         if (vtag_in != asoc->my_vtag) {
4417                                 /* invalid vtag... */
4418                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4419                                     "invalid vtag: %xh, expect %xh\n",
4420                                     vtag_in, asoc->my_vtag);
4421                                 SCTP_STAT_INCR(sctps_badvtag);
4422                                 if (locked_tcb) {
4423                                         SCTP_TCB_UNLOCK(locked_tcb);
4424                                 }
4425                                 *offset = length;
4426                                 return (NULL);
4427                         }
4428                 }
4429         }                       /* end if !SCTP_COOKIE_ECHO */
4430         /*
4431          * process all control chunks...
4432          */
4433         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4434         /* EY */
4435             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4436             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4437             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
4438                 /* implied cookie-ack.. we must have lost the ack */
4439                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4440                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4441                             stcb->asoc.overall_error_count,
4442                             0,
4443                             SCTP_FROM_SCTP_INPUT,
4444                             __LINE__);
4445                 }
4446                 stcb->asoc.overall_error_count = 0;
4447                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4448                     *netp);
4449         }
4450 process_control_chunks:
4451         while (IS_SCTP_CONTROL(ch)) {
4452                 /* validate chunk length */
4453                 chk_length = ntohs(ch->chunk_length);
4454                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4455                     ch->chunk_type, chk_length);
4456                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4457                 if (chk_length < sizeof(*ch) ||
4458                     (*offset + (int)chk_length) > length) {
4459                         *offset = length;
4460                         if (locked_tcb) {
4461                                 SCTP_TCB_UNLOCK(locked_tcb);
4462                         }
4463                         return (NULL);
4464                 }
4465                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4466                 /*
4467                  * INIT-ACK only gets the init ack "header" portion only
4468                  * because we don't have to process the peer's COOKIE. All
4469                  * others get a complete chunk.
4470                  */
4471                 if ((ch->chunk_type == SCTP_INITIATION_ACK) ||
4472                     (ch->chunk_type == SCTP_INITIATION)) {
4473                         /* get an init-ack chunk */
4474                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4475                             sizeof(struct sctp_init_ack_chunk), chunk_buf);
4476                         if (ch == NULL) {
4477                                 *offset = length;
4478                                 if (locked_tcb) {
4479                                         SCTP_TCB_UNLOCK(locked_tcb);
4480                                 }
4481                                 return (NULL);
4482                         }
4483                 } else {
4484                         /* For cookies and all other chunks. */
4485                         if (chk_length > sizeof(chunk_buf)) {
4486                                 /*
4487                                  * use just the size of the chunk buffer so
4488                                  * the front part of our chunks fit in
4489                                  * contiguous space up to the chunk buffer
4490                                  * size (508 bytes). For chunks that need to
4491                                  * get more than that they must use the
4492                                  * sctp_m_getptr() function or other means
4493                                  * (e.g. know how to parse mbuf chains).
4494                                  * Cookies do this already.
4495                                  */
4496                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4497                                     (sizeof(chunk_buf) - 4),
4498                                     chunk_buf);
4499                                 if (ch == NULL) {
4500                                         *offset = length;
4501                                         if (locked_tcb) {
4502                                                 SCTP_TCB_UNLOCK(locked_tcb);
4503                                         }
4504                                         return (NULL);
4505                                 }
4506                         } else {
4507                                 /* We can fit it all */
4508                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4509                                     chk_length, chunk_buf);
4510                                 if (ch == NULL) {
4511                                         SCTP_PRINTF("sctp_process_control: Can't get the all data....\n");
4512                                         *offset = length;
4513                                         if (locked_tcb) {
4514                                                 SCTP_TCB_UNLOCK(locked_tcb);
4515                                         }
4516                                         return (NULL);
4517                                 }
4518                         }
4519                 }
4520                 num_chunks++;
4521                 /* Save off the last place we got a control from */
4522                 if (stcb != NULL) {
4523                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4524                                 /*
4525                                  * allow last_control to be NULL if
4526                                  * ASCONF... ASCONF processing will find the
4527                                  * right net later
4528                                  */
4529                                 if ((netp != NULL) && (*netp != NULL))
4530                                         stcb->asoc.last_control_chunk_from = *netp;
4531                         }
4532                 }
4533 #ifdef SCTP_AUDITING_ENABLED
4534                 sctp_audit_log(0xB0, ch->chunk_type);
4535 #endif
4536
4537                 /* check to see if this chunk required auth, but isn't */
4538                 if ((stcb != NULL) &&
4539                     !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
4540                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4541                     !stcb->asoc.authenticated) {
4542                         /* "silently" ignore */
4543                         SCTP_STAT_INCR(sctps_recvauthmissing);
4544                         goto next_chunk;
4545                 }
4546                 switch (ch->chunk_type) {
4547                 case SCTP_INITIATION:
4548                         /* must be first and only chunk */
4549                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4550                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4551                                 /* We are not interested anymore? */
4552                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4553                                         /*
4554                                          * collision case where we are
4555                                          * sending to them too
4556                                          */
4557                                         ;
4558                                 } else {
4559                                         if (locked_tcb) {
4560                                                 SCTP_TCB_UNLOCK(locked_tcb);
4561                                         }
4562                                         *offset = length;
4563                                         return (NULL);
4564                                 }
4565                         }
4566                         if ((chk_length > SCTP_LARGEST_INIT_ACCEPTED) ||
4567                             (num_chunks > 1) ||
4568                             (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) {
4569                                 *offset = length;
4570                                 if (locked_tcb) {
4571                                         SCTP_TCB_UNLOCK(locked_tcb);
4572                                 }
4573                                 return (NULL);
4574                         }
4575                         if ((stcb != NULL) &&
4576                             (SCTP_GET_STATE(&stcb->asoc) ==
4577                             SCTP_STATE_SHUTDOWN_ACK_SENT)) {
4578                                 sctp_send_shutdown_ack(stcb,
4579                                     stcb->asoc.primary_destination);
4580                                 *offset = length;
4581                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4582                                 if (locked_tcb) {
4583                                         SCTP_TCB_UNLOCK(locked_tcb);
4584                                 }
4585                                 return (NULL);
4586                         }
4587                         if (netp) {
4588                                 sctp_handle_init(m, iphlen, *offset, sh,
4589                                     (struct sctp_init_chunk *)ch, inp,
4590                                     stcb, *netp, &abort_no_unlock, vrf_id, port);
4591                         }
4592                         if (abort_no_unlock)
4593                                 return (NULL);
4594
4595                         *offset = length;
4596                         if (locked_tcb) {
4597                                 SCTP_TCB_UNLOCK(locked_tcb);
4598                         }
4599                         return (NULL);
4600                         break;
4601                 case SCTP_PAD_CHUNK:
4602                         break;
4603                 case SCTP_INITIATION_ACK:
4604                         /* must be first and only chunk */
4605                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n");
4606                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4607                                 /* We are not interested anymore */
4608                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4609                                         ;
4610                                 } else {
4611                                         if (locked_tcb != stcb) {
4612                                                 /* Very unlikely */
4613                                                 SCTP_TCB_UNLOCK(locked_tcb);
4614                                         }
4615                                         *offset = length;
4616                                         if (stcb) {
4617 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4618                                                 so = SCTP_INP_SO(inp);
4619                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4620                                                 SCTP_TCB_UNLOCK(stcb);
4621                                                 SCTP_SOCKET_LOCK(so, 1);
4622                                                 SCTP_TCB_LOCK(stcb);
4623                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4624 #endif
4625                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
4626 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4627                                                 SCTP_SOCKET_UNLOCK(so, 1);
4628 #endif
4629                                         }
4630                                         return (NULL);
4631                                 }
4632                         }
4633                         if ((num_chunks > 1) ||
4634                             (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) {
4635                                 *offset = length;
4636                                 if (locked_tcb) {
4637                                         SCTP_TCB_UNLOCK(locked_tcb);
4638                                 }
4639                                 return (NULL);
4640                         }
4641                         if ((netp) && (*netp)) {
4642                                 ret = sctp_handle_init_ack(m, iphlen, *offset, sh,
4643                                     (struct sctp_init_ack_chunk *)ch, stcb, *netp, &abort_no_unlock, vrf_id);
4644                         } else {
4645                                 ret = -1;
4646                         }
4647                         /*
4648                          * Special case, I must call the output routine to
4649                          * get the cookie echoed
4650                          */
4651                         if (abort_no_unlock)
4652                                 return (NULL);
4653
4654                         if ((stcb) && ret == 0)
4655                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4656                         *offset = length;
4657                         if (locked_tcb) {
4658                                 SCTP_TCB_UNLOCK(locked_tcb);
4659                         }
4660                         return (NULL);
4661                         break;
4662                 case SCTP_SELECTIVE_ACK:
4663                         {
4664                                 struct sctp_sack_chunk *sack;
4665                                 int abort_now = 0;
4666                                 uint32_t a_rwnd, cum_ack;
4667                                 uint16_t num_seg, num_dup;
4668                                 uint8_t flags;
4669                                 int offset_seg, offset_dup;
4670
4671                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n");
4672                                 SCTP_STAT_INCR(sctps_recvsacks);
4673                                 if (stcb == NULL) {
4674                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n");
4675                                         break;
4676                                 }
4677                                 if (chk_length < sizeof(struct sctp_sack_chunk)) {
4678                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4679                                         break;
4680                                 }
4681                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4682                                         /*-
4683                                          * If we have sent a shutdown-ack, we will pay no
4684                                          * attention to a sack sent in to us since
4685                                          * we don't care anymore.
4686                                          */
4687                                         break;
4688                                 }
4689                                 sack = (struct sctp_sack_chunk *)ch;
4690                                 flags = ch->chunk_flags;
4691                                 cum_ack = ntohl(sack->sack.cum_tsn_ack);
4692                                 num_seg = ntohs(sack->sack.num_gap_ack_blks);
4693                                 num_dup = ntohs(sack->sack.num_dup_tsns);
4694                                 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd);
4695                                 if (sizeof(struct sctp_sack_chunk) +
4696                                     num_seg * sizeof(struct sctp_gap_ack_block) +
4697                                     num_dup * sizeof(uint32_t) != chk_length) {
4698                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4699                                         break;
4700                                 }
4701                                 offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4702                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4703                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4704                                     cum_ack, num_seg, a_rwnd);
4705                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4706                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4707                                     (num_seg == 0) &&
4708                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4709                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4710                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4711                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))
4712                                     ) {
4713                                         /*
4714                                          * We have a SIMPLE sack having no
4715                                          * prior segments and data on sent
4716                                          * queue to be acked.. Use the
4717                                          * faster path sack processing. We
4718                                          * also allow window update sacks
4719                                          * with no missing segments to go
4720                                          * this way too.
4721                                          */
4722                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen);
4723                                 } else {
4724                                         if (netp && *netp)
4725                                                 sctp_handle_sack(m, offset_seg, offset_dup,
4726                                                     stcb, *netp,
4727                                                     num_seg, 0, num_dup, &abort_now, flags,
4728                                                     cum_ack, a_rwnd, ecne_seen);
4729                                 }
4730                                 if (abort_now) {
4731                                         /* ABORT signal from sack processing */
4732                                         *offset = length;
4733                                         return (NULL);
4734                                 }
4735                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4736                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4737                                     (stcb->asoc.stream_queue_cnt == 0)) {
4738                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4739                                 }
4740                         }
4741                         break;
4742                         /*
4743                          * EY - nr_sack:  If the received chunk is an
4744                          * nr_sack chunk
4745                          */
4746                 case SCTP_NR_SELECTIVE_ACK:
4747                         {
4748                                 struct sctp_nr_sack_chunk *nr_sack;
4749                                 int abort_now = 0;
4750                                 uint32_t a_rwnd, cum_ack;
4751                                 uint16_t num_seg, num_nr_seg, num_dup;
4752                                 uint8_t flags;
4753                                 int offset_seg, offset_dup;
4754
4755                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n");
4756                                 SCTP_STAT_INCR(sctps_recvsacks);
4757                                 if (stcb == NULL) {
4758                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n");
4759                                         break;
4760                                 }
4761                                 if ((stcb->asoc.sctp_nr_sack_on_off == 0) ||
4762                                     (stcb->asoc.peer_supports_nr_sack == 0)) {
4763                                         goto unknown_chunk;
4764                                 }
4765                                 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
4766                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n");
4767                                         break;
4768                                 }
4769                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4770                                         /*-
4771                                          * If we have sent a shutdown-ack, we will pay no
4772                                          * attention to a sack sent in to us since
4773                                          * we don't care anymore.
4774                                          */
4775                                         break;
4776                                 }
4777                                 nr_sack = (struct sctp_nr_sack_chunk *)ch;
4778                                 flags = ch->chunk_flags;
4779                                 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
4780                                 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
4781                                 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
4782                                 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
4783                                 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd);
4784                                 if (sizeof(struct sctp_nr_sack_chunk) +
4785                                     (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
4786                                     num_dup * sizeof(uint32_t) != chk_length) {
4787                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
4788                                         break;
4789                                 }
4790                                 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
4791                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4792                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4793                                     cum_ack, num_seg, a_rwnd);
4794                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4795                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4796                                     (num_seg == 0) && (num_nr_seg == 0) &&
4797                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4798                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4799                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4800                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
4801                                         /*
4802                                          * We have a SIMPLE sack having no
4803                                          * prior segments and data on sent
4804                                          * queue to be acked. Use the faster
4805                                          * path sack processing. We also
4806                                          * allow window update sacks with no
4807                                          * missing segments to go this way
4808                                          * too.
4809                                          */
4810                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
4811                                             &abort_now, ecne_seen);
4812                                 } else {
4813                                         if (netp && *netp)
4814                                                 sctp_handle_sack(m, offset_seg, offset_dup,
4815                                                     stcb, *netp,
4816                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
4817                                                     cum_ack, a_rwnd, ecne_seen);
4818                                 }
4819                                 if (abort_now) {
4820                                         /* ABORT signal from sack processing */
4821                                         *offset = length;
4822                                         return (NULL);
4823                                 }
4824                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4825                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4826                                     (stcb->asoc.stream_queue_cnt == 0)) {
4827                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4828                                 }
4829                         }
4830                         break;
4831
4832                 case SCTP_HEARTBEAT_REQUEST:
4833                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
4834                         if ((stcb) && netp && *netp) {
4835                                 SCTP_STAT_INCR(sctps_recvheartbeat);
4836                                 sctp_send_heartbeat_ack(stcb, m, *offset,
4837                                     chk_length, *netp);
4838
4839                                 /* He's alive so give him credit */
4840                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4841                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4842                                             stcb->asoc.overall_error_count,
4843                                             0,
4844                                             SCTP_FROM_SCTP_INPUT,
4845                                             __LINE__);
4846                                 }
4847                                 stcb->asoc.overall_error_count = 0;
4848                         }
4849                         break;
4850                 case SCTP_HEARTBEAT_ACK:
4851                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n");
4852                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
4853                                 /* Its not ours */
4854                                 *offset = length;
4855                                 if (locked_tcb) {
4856                                         SCTP_TCB_UNLOCK(locked_tcb);
4857                                 }
4858                                 return (NULL);
4859                         }
4860                         /* He's alive so give him credit */
4861                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4862                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4863                                     stcb->asoc.overall_error_count,
4864                                     0,
4865                                     SCTP_FROM_SCTP_INPUT,
4866                                     __LINE__);
4867                         }
4868                         stcb->asoc.overall_error_count = 0;
4869                         SCTP_STAT_INCR(sctps_recvheartbeatack);
4870                         if (netp && *netp)
4871                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
4872                                     stcb, *netp);
4873                         break;
4874                 case SCTP_ABORT_ASSOCIATION:
4875                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
4876                             stcb);
4877                         if ((stcb) && netp && *netp)
4878                                 sctp_handle_abort((struct sctp_abort_chunk *)ch,
4879                                     stcb, *netp);
4880                         *offset = length;
4881                         return (NULL);
4882                         break;
4883                 case SCTP_SHUTDOWN:
4884                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
4885                             stcb);
4886                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
4887                                 *offset = length;
4888                                 if (locked_tcb) {
4889                                         SCTP_TCB_UNLOCK(locked_tcb);
4890                                 }
4891                                 return (NULL);
4892                         }
4893                         if (netp && *netp) {
4894                                 int abort_flag = 0;
4895
4896                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
4897                                     stcb, *netp, &abort_flag);
4898                                 if (abort_flag) {
4899                                         *offset = length;
4900                                         return (NULL);
4901                                 }
4902                         }
4903                         break;
4904                 case SCTP_SHUTDOWN_ACK:
4905                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", stcb);
4906                         if ((stcb) && (netp) && (*netp))
4907                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
4908                         *offset = length;
4909                         return (NULL);
4910                         break;
4911
4912                 case SCTP_OPERATION_ERROR:
4913                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n");
4914                         if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) {
4915
4916                                 *offset = length;
4917                                 return (NULL);
4918                         }
4919                         break;
4920                 case SCTP_COOKIE_ECHO:
4921                         SCTPDBG(SCTP_DEBUG_INPUT3,
4922                             "SCTP_COOKIE-ECHO, stcb %p\n", stcb);
4923                         if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4924                                 ;
4925                         } else {
4926                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4927                                         /* We are not interested anymore */
4928                         abend:
4929                                         if (stcb) {
4930                                                 SCTP_TCB_UNLOCK(stcb);
4931                                         }
4932                                         *offset = length;
4933                                         return (NULL);
4934                                 }
4935                         }
4936                         /*
4937                          * First are we accepting? We do this again here
4938                          * since it is possible that a previous endpoint WAS
4939                          * listening responded to a INIT-ACK and then
4940                          * closed. We opened and bound.. and are now no
4941                          * longer listening.
4942                          */
4943
4944                         if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) {
4945                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
4946                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
4947                                         struct mbuf *oper;
4948                                         struct sctp_paramhdr *phdr;
4949
4950                                         oper = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
4951                                             0, M_DONTWAIT, 1, MT_DATA);
4952                                         if (oper) {
4953                                                 SCTP_BUF_LEN(oper) =
4954                                                     sizeof(struct sctp_paramhdr);
4955                                                 phdr = mtod(oper,
4956                                                     struct sctp_paramhdr *);
4957                                                 phdr->param_type =
4958                                                     htons(SCTP_CAUSE_OUT_OF_RESC);
4959                                                 phdr->param_length =
4960                                                     htons(sizeof(struct sctp_paramhdr));
4961                                         }
4962                                         sctp_abort_association(inp, stcb, m,
4963                                             iphlen, sh, oper, vrf_id, port);
4964                                 }
4965                                 *offset = length;
4966                                 return (NULL);
4967                         } else {
4968                                 struct mbuf *ret_buf;
4969                                 struct sctp_inpcb *linp;
4970
4971                                 if (stcb) {
4972                                         linp = NULL;
4973                                 } else {
4974                                         linp = inp;
4975                                 }
4976
4977                                 if (linp) {
4978                                         SCTP_ASOC_CREATE_LOCK(linp);
4979                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
4980                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
4981                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
4982                                                 goto abend;
4983                                         }
4984                                 }
4985                                 if (netp) {
4986                                         ret_buf =
4987                                             sctp_handle_cookie_echo(m, iphlen,
4988                                             *offset, sh,
4989                                             (struct sctp_cookie_echo_chunk *)ch,
4990                                             &inp, &stcb, netp,
4991                                             auth_skipped,
4992                                             auth_offset,
4993                                             auth_len,
4994                                             &locked_tcb,
4995                                             vrf_id,
4996                                             port);
4997                                 } else {
4998                                         ret_buf = NULL;
4999                                 }
5000                                 if (linp) {
5001                                         SCTP_ASOC_CREATE_UNLOCK(linp);
5002                                 }
5003                                 if (ret_buf == NULL) {
5004                                         if (locked_tcb) {
5005                                                 SCTP_TCB_UNLOCK(locked_tcb);
5006                                         }
5007                                         SCTPDBG(SCTP_DEBUG_INPUT3,
5008                                             "GAK, null buffer\n");
5009                                         auth_skipped = 0;
5010                                         *offset = length;
5011                                         return (NULL);
5012                                 }
5013                                 /* if AUTH skipped, see if it verified... */
5014                                 if (auth_skipped) {
5015                                         got_auth = 1;
5016                                         auth_skipped = 0;
5017                                 }
5018                                 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
5019                                         /*
5020                                          * Restart the timer if we have
5021                                          * pending data
5022                                          */
5023                                         struct sctp_tmit_chunk *chk;
5024
5025                                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
5026                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
5027                                 }
5028                         }
5029                         break;
5030                 case SCTP_COOKIE_ACK:
5031                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", stcb);
5032                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5033                                 if (locked_tcb) {
5034                                         SCTP_TCB_UNLOCK(locked_tcb);
5035                                 }
5036                                 return (NULL);
5037                         }
5038                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5039                                 /* We are not interested anymore */
5040                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5041                                         ;
5042                                 } else if (stcb) {
5043 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5044                                         so = SCTP_INP_SO(inp);
5045                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5046                                         SCTP_TCB_UNLOCK(stcb);
5047                                         SCTP_SOCKET_LOCK(so, 1);
5048                                         SCTP_TCB_LOCK(stcb);
5049                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5050 #endif
5051                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
5052 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5053                                         SCTP_SOCKET_UNLOCK(so, 1);
5054 #endif
5055                                         *offset = length;
5056                                         return (NULL);
5057                                 }
5058                         }
5059                         /* He's alive so give him credit */
5060                         if ((stcb) && netp && *netp) {
5061                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5062                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5063                                             stcb->asoc.overall_error_count,
5064                                             0,
5065                                             SCTP_FROM_SCTP_INPUT,
5066                                             __LINE__);
5067                                 }
5068                                 stcb->asoc.overall_error_count = 0;
5069                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
5070                         }
5071                         break;
5072                 case SCTP_ECN_ECHO:
5073                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n");
5074                         /* He's alive so give him credit */
5075                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5076                                 /* Its not ours */
5077                                 if (locked_tcb) {
5078                                         SCTP_TCB_UNLOCK(locked_tcb);
5079                                 }
5080                                 *offset = length;
5081                                 return (NULL);
5082                         }
5083                         if (stcb) {
5084                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5085                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5086                                             stcb->asoc.overall_error_count,
5087                                             0,
5088                                             SCTP_FROM_SCTP_INPUT,
5089                                             __LINE__);
5090                                 }
5091                                 stcb->asoc.overall_error_count = 0;
5092                                 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch,
5093                                     stcb);
5094                                 ecne_seen = 1;
5095                         }
5096                         break;
5097                 case SCTP_ECN_CWR:
5098                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n");
5099                         /* He's alive so give him credit */
5100                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5101                                 /* Its not ours */
5102                                 if (locked_tcb) {
5103                                         SCTP_TCB_UNLOCK(locked_tcb);
5104                                 }
5105                                 *offset = length;
5106                                 return (NULL);
5107                         }
5108                         if (stcb) {
5109                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5110                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5111                                             stcb->asoc.overall_error_count,
5112                                             0,
5113                                             SCTP_FROM_SCTP_INPUT,
5114                                             __LINE__);
5115                                 }
5116                                 stcb->asoc.overall_error_count = 0;
5117                                 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5118                         }
5119                         break;
5120                 case SCTP_SHUTDOWN_COMPLETE:
5121                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", stcb);
5122                         /* must be first and only chunk */
5123                         if ((num_chunks > 1) ||
5124                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5125                                 *offset = length;
5126                                 if (locked_tcb) {
5127                                         SCTP_TCB_UNLOCK(locked_tcb);
5128                                 }
5129                                 return (NULL);
5130                         }
5131                         if ((stcb) && netp && *netp) {
5132                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5133                                     stcb, *netp);
5134                         }
5135                         *offset = length;
5136                         return (NULL);
5137                         break;
5138                 case SCTP_ASCONF:
5139                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5140                         /* He's alive so give him credit */
5141                         if (stcb) {
5142                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5143                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5144                                             stcb->asoc.overall_error_count,
5145                                             0,
5146                                             SCTP_FROM_SCTP_INPUT,
5147                                             __LINE__);
5148                                 }
5149                                 stcb->asoc.overall_error_count = 0;
5150                                 sctp_handle_asconf(m, *offset,
5151                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5152                                 asconf_cnt++;
5153                         }
5154                         break;
5155                 case SCTP_ASCONF_ACK:
5156                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n");
5157                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5158                                 /* Its not ours */
5159                                 if (locked_tcb) {
5160                                         SCTP_TCB_UNLOCK(locked_tcb);
5161                                 }
5162                                 *offset = length;
5163                                 return (NULL);
5164                         }
5165                         if ((stcb) && netp && *netp) {
5166                                 /* He's alive so give him credit */
5167                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5168                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5169                                             stcb->asoc.overall_error_count,
5170                                             0,
5171                                             SCTP_FROM_SCTP_INPUT,
5172                                             __LINE__);
5173                                 }
5174                                 stcb->asoc.overall_error_count = 0;
5175                                 sctp_handle_asconf_ack(m, *offset,
5176                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5177                                 if (abort_no_unlock)
5178                                         return (NULL);
5179                         }
5180                         break;
5181                 case SCTP_FORWARD_CUM_TSN:
5182                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n");
5183                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5184                                 /* Its not ours */
5185                                 if (locked_tcb) {
5186                                         SCTP_TCB_UNLOCK(locked_tcb);
5187                                 }
5188                                 *offset = length;
5189                                 return (NULL);
5190                         }
5191                         /* He's alive so give him credit */
5192                         if (stcb) {
5193                                 int abort_flag = 0;
5194
5195                                 stcb->asoc.overall_error_count = 0;
5196                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5197                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5198                                             stcb->asoc.overall_error_count,
5199                                             0,
5200                                             SCTP_FROM_SCTP_INPUT,
5201                                             __LINE__);
5202                                 }
5203                                 *fwd_tsn_seen = 1;
5204                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5205                                         /* We are not interested anymore */
5206 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5207                                         so = SCTP_INP_SO(inp);
5208                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5209                                         SCTP_TCB_UNLOCK(stcb);
5210                                         SCTP_SOCKET_LOCK(so, 1);
5211                                         SCTP_TCB_LOCK(stcb);
5212                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5213 #endif
5214                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
5215 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5216                                         SCTP_SOCKET_UNLOCK(so, 1);
5217 #endif
5218                                         *offset = length;
5219                                         return (NULL);
5220                                 }
5221                                 sctp_handle_forward_tsn(stcb,
5222                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5223                                 if (abort_flag) {
5224                                         *offset = length;
5225                                         return (NULL);
5226                                 } else {
5227                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5228                                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5229                                                     stcb->asoc.overall_error_count,
5230                                                     0,
5231                                                     SCTP_FROM_SCTP_INPUT,
5232                                                     __LINE__);
5233                                         }
5234                                         stcb->asoc.overall_error_count = 0;
5235                                 }
5236
5237                         }
5238                         break;
5239                 case SCTP_STREAM_RESET:
5240                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5241                         if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
5242                                 /* Its not ours */
5243                                 if (locked_tcb) {
5244                                         SCTP_TCB_UNLOCK(locked_tcb);
5245                                 }
5246                                 *offset = length;
5247                                 return (NULL);
5248                         }
5249                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5250                                 /* We are not interested anymore */
5251 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5252                                 so = SCTP_INP_SO(inp);
5253                                 atomic_add_int(&stcb->asoc.refcnt, 1);
5254                                 SCTP_TCB_UNLOCK(stcb);
5255                                 SCTP_SOCKET_LOCK(so, 1);
5256                                 SCTP_TCB_LOCK(stcb);
5257                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
5258 #endif
5259                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
5260 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5261                                 SCTP_SOCKET_UNLOCK(so, 1);
5262 #endif
5263                                 *offset = length;
5264                                 return (NULL);
5265                         }
5266                         if (stcb->asoc.peer_supports_strreset == 0) {
5267                                 /*
5268                                  * hmm, peer should have announced this, but
5269                                  * we will turn it on since he is sending us
5270                                  * a stream reset.
5271                                  */
5272                                 stcb->asoc.peer_supports_strreset = 1;
5273                         }
5274                         if (sctp_handle_stream_reset(stcb, m, *offset, (struct sctp_stream_reset_out_req *)ch)) {
5275                                 /* stop processing */
5276                                 *offset = length;
5277                                 return (NULL);
5278                         }
5279                         break;
5280                 case SCTP_PACKET_DROPPED:
5281                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5282                         /* re-get it all please */
5283                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5284                                 /* Its not ours */
5285                                 if (locked_tcb) {
5286                                         SCTP_TCB_UNLOCK(locked_tcb);
5287                                 }
5288                                 *offset = length;
5289                                 return (NULL);
5290                         }
5291                         if (ch && (stcb) && netp && (*netp)) {
5292                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5293                                     stcb, *netp,
5294                                     min(chk_length, (sizeof(chunk_buf) - 4)));
5295
5296                         }
5297                         break;
5298
5299                 case SCTP_AUTHENTICATION:
5300                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5301                         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
5302                                 goto unknown_chunk;
5303
5304                         if (stcb == NULL) {
5305                                 /* save the first AUTH for later processing */
5306                                 if (auth_skipped == 0) {
5307                                         auth_offset = *offset;
5308                                         auth_len = chk_length;
5309                                         auth_skipped = 1;
5310                                 }
5311                                 /* skip this chunk (temporarily) */
5312                                 goto next_chunk;
5313                         }
5314                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5315                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5316                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5317                                 /* Its not ours */
5318                                 if (locked_tcb) {
5319                                         SCTP_TCB_UNLOCK(locked_tcb);
5320                                 }
5321                                 *offset = length;
5322                                 return (NULL);
5323                         }
5324                         if (got_auth == 1) {
5325                                 /* skip this chunk... it's already auth'd */
5326                                 goto next_chunk;
5327                         }
5328                         got_auth = 1;
5329                         if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
5330                             m, *offset)) {
5331                                 /* auth HMAC failed so dump the packet */
5332                                 *offset = length;
5333                                 return (stcb);
5334                         } else {
5335                                 /* remaining chunks are HMAC checked */
5336                                 stcb->asoc.authenticated = 1;
5337                         }
5338                         break;
5339
5340                 default:
5341         unknown_chunk:
5342                         /* it's an unknown chunk! */
5343                         if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
5344                                 struct mbuf *mm;
5345                                 struct sctp_paramhdr *phd;
5346
5347                                 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
5348                                     0, M_DONTWAIT, 1, MT_DATA);
5349                                 if (mm) {
5350                                         phd = mtod(mm, struct sctp_paramhdr *);
5351                                         /*
5352                                          * We cheat and use param type since
5353                                          * we did not bother to define a
5354                                          * error cause struct. They are the
5355                                          * same basic format with different
5356                                          * names.
5357                                          */
5358                                         phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5359                                         phd->param_length = htons(chk_length + sizeof(*phd));
5360                                         SCTP_BUF_LEN(mm) = sizeof(*phd);
5361                                         SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, SCTP_SIZE32(chk_length),
5362                                             M_DONTWAIT);
5363                                         if (SCTP_BUF_NEXT(mm)) {
5364 #ifdef SCTP_MBUF_LOGGING
5365                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5366                                                         struct mbuf *mat;
5367
5368                                                         mat = SCTP_BUF_NEXT(mm);
5369                                                         while (mat) {
5370                                                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
5371                                                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
5372                                                                 }
5373                                                                 mat = SCTP_BUF_NEXT(mat);
5374                                                         }
5375                                                 }
5376 #endif
5377                                                 sctp_queue_op_err(stcb, mm);
5378                                         } else {
5379                                                 sctp_m_freem(mm);
5380                                         }
5381                                 }
5382                         }
5383                         if ((ch->chunk_type & 0x80) == 0) {
5384                                 /* discard this packet */
5385                                 *offset = length;
5386                                 return (stcb);
5387                         }       /* else skip this bad chunk and continue... */
5388                         break;
5389                 }               /* switch (ch->chunk_type) */
5390
5391
5392 next_chunk:
5393                 /* get the next chunk */
5394                 *offset += SCTP_SIZE32(chk_length);
5395                 if (*offset >= length) {
5396                         /* no more data left in the mbuf chain */
5397                         break;
5398                 }
5399                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5400                     sizeof(struct sctp_chunkhdr), chunk_buf);
5401                 if (ch == NULL) {
5402                         if (locked_tcb) {
5403                                 SCTP_TCB_UNLOCK(locked_tcb);
5404                         }
5405                         *offset = length;
5406                         return (NULL);
5407                 }
5408         }                       /* while */
5409
5410         if (asconf_cnt > 0 && stcb != NULL) {
5411                 sctp_send_asconf_ack(stcb);
5412         }
5413         return (stcb);
5414 }
5415
5416
5417 #ifdef INVARIANTS
5418 #ifdef __GNUC__
5419 __attribute__((noinline))
5420 #endif
5421         void
5422              sctp_validate_no_locks(struct sctp_inpcb *inp)
5423 {
5424         struct sctp_tcb *lstcb;
5425
5426         LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) {
5427                 if (mtx_owned(&lstcb->tcb_mtx)) {
5428                         panic("Own lock on stcb at return from input");
5429                 }
5430         }
5431         if (mtx_owned(&inp->inp_create_mtx)) {
5432                 panic("Own create lock on inp");
5433         }
5434         if (mtx_owned(&inp->inp_mtx)) {
5435                 panic("Own inp lock on inp");
5436         }
5437 }
5438
5439 #endif
5440
5441 /*
5442  * common input chunk processing (v4 and v6)
5443  */
5444 void
5445 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset,
5446     int length, struct sctphdr *sh, struct sctp_chunkhdr *ch,
5447     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net,
5448     uint8_t ecn_bits, uint32_t vrf_id, uint16_t port)
5449 {
5450         /*
5451          * Control chunk processing
5452          */
5453         uint32_t high_tsn;
5454         int fwd_tsn_seen = 0, data_processed = 0;
5455         struct mbuf *m = *mm;
5456         int abort_flag = 0;
5457         int un_sent;
5458         int cnt_ctrl_ready = 0;
5459
5460         SCTP_STAT_INCR(sctps_recvdatagrams);
5461 #ifdef SCTP_AUDITING_ENABLED
5462         sctp_audit_log(0xE0, 1);
5463         sctp_auditing(0, inp, stcb, net);
5464 #endif
5465
5466         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5467             m, iphlen, offset, length, stcb);
5468         if (stcb) {
5469                 /* always clear this before beginning a packet */
5470                 stcb->asoc.authenticated = 0;
5471                 stcb->asoc.seen_a_sack_this_pkt = 0;
5472                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5473                     stcb, stcb->asoc.state);
5474
5475                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5476                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5477                         /*-
5478                          * If we hit here, we had a ref count
5479                          * up when the assoc was aborted and the
5480                          * timer is clearing out the assoc, we should
5481                          * NOT respond to any packet.. its OOTB.
5482                          */
5483                         SCTP_TCB_UNLOCK(stcb);
5484                         sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL,
5485                             vrf_id, port);
5486                         goto out_now;
5487                 }
5488         }
5489         if (IS_SCTP_CONTROL(ch)) {
5490                 /* process the control portion of the SCTP packet */
5491                 /* sa_ignore NO_NULL_CHK */
5492                 stcb = sctp_process_control(m, iphlen, &offset, length, sh, ch,
5493                     inp, stcb, &net, &fwd_tsn_seen, vrf_id, port);
5494                 if (stcb) {
5495                         /*
5496                          * This covers us if the cookie-echo was there and
5497                          * it changes our INP.
5498                          */
5499                         inp = stcb->sctp_ep;
5500                         if ((net) && (port)) {
5501                                 if (net->port == 0) {
5502                                         sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr));
5503                                 }
5504                                 net->port = port;
5505                         }
5506                 }
5507         } else {
5508                 /*
5509                  * no control chunks, so pre-process DATA chunks (these
5510                  * checks are taken care of by control processing)
5511                  */
5512
5513                 /*
5514                  * if DATA only packet, and auth is required, then punt...
5515                  * can't have authenticated without any AUTH (control)
5516                  * chunks
5517                  */
5518                 if ((stcb != NULL) &&
5519                     !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
5520                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5521                         /* "silently" ignore */
5522                         SCTP_STAT_INCR(sctps_recvauthmissing);
5523                         SCTP_TCB_UNLOCK(stcb);
5524                         goto out_now;
5525                 }
5526                 if (stcb == NULL) {
5527                         /* out of the blue DATA chunk */
5528                         sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL,
5529                             vrf_id, port);
5530                         goto out_now;
5531                 }
5532                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5533                         /* v_tag mismatch! */
5534                         SCTP_STAT_INCR(sctps_badvtag);
5535                         SCTP_TCB_UNLOCK(stcb);
5536                         goto out_now;
5537                 }
5538         }
5539
5540         if (stcb == NULL) {
5541                 /*
5542                  * no valid TCB for this packet, or we found it's a bad
5543                  * packet while processing control, or we're done with this
5544                  * packet (done or skip rest of data), so we drop it...
5545                  */
5546                 goto out_now;
5547         }
5548         /*
5549          * DATA chunk processing
5550          */
5551         /* plow through the data chunks while length > offset */
5552
5553         /*
5554          * Rest should be DATA only.  Check authentication state if AUTH for
5555          * DATA is required.
5556          */
5557         if ((length > offset) &&
5558             (stcb != NULL) &&
5559             !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
5560             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5561             !stcb->asoc.authenticated) {
5562                 /* "silently" ignore */
5563                 SCTP_STAT_INCR(sctps_recvauthmissing);
5564                 SCTPDBG(SCTP_DEBUG_AUTH1,
5565                     "Data chunk requires AUTH, skipped\n");
5566                 goto trigger_send;
5567         }
5568         if (length > offset) {
5569                 int retval;
5570
5571                 /*
5572                  * First check to make sure our state is correct. We would
5573                  * not get here unless we really did have a tag, so we don't
5574                  * abort if this happens, just dump the chunk silently.
5575                  */
5576                 switch (SCTP_GET_STATE(&stcb->asoc)) {
5577                 case SCTP_STATE_COOKIE_ECHOED:
5578                         /*
5579                          * we consider data with valid tags in this state
5580                          * shows us the cookie-ack was lost. Imply it was
5581                          * there.
5582                          */
5583                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5584                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5585                                     stcb->asoc.overall_error_count,
5586                                     0,
5587                                     SCTP_FROM_SCTP_INPUT,
5588                                     __LINE__);
5589                         }
5590                         stcb->asoc.overall_error_count = 0;
5591                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5592                         break;
5593                 case SCTP_STATE_COOKIE_WAIT:
5594                         /*
5595                          * We consider OOTB any data sent during asoc setup.
5596                          */
5597                         sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL,
5598                             vrf_id, port);
5599                         SCTP_TCB_UNLOCK(stcb);
5600                         goto out_now;
5601                         /* sa_ignore NOTREACHED */
5602                         break;
5603                 case SCTP_STATE_EMPTY:  /* should not happen */
5604                 case SCTP_STATE_INUSE:  /* should not happen */
5605                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5606                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5607                 default:
5608                         SCTP_TCB_UNLOCK(stcb);
5609                         goto out_now;
5610                         /* sa_ignore NOTREACHED */
5611                         break;
5612                 case SCTP_STATE_OPEN:
5613                 case SCTP_STATE_SHUTDOWN_SENT:
5614                         break;
5615                 }
5616                 /* plow through the data chunks while length > offset */
5617                 retval = sctp_process_data(mm, iphlen, &offset, length, sh,
5618                     inp, stcb, net, &high_tsn);
5619                 if (retval == 2) {
5620                         /*
5621                          * The association aborted, NO UNLOCK needed since
5622                          * the association is destroyed.
5623                          */
5624                         goto out_now;
5625                 }
5626                 data_processed = 1;
5627                 /*
5628                  * Anything important needs to have been m_copy'ed in
5629                  * process_data
5630                  */
5631         }
5632         /* take care of ecn */
5633         if ((stcb->asoc.ecn_allowed == 1) &&
5634             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5635                 /* Yep, we need to add a ECNE */
5636                 sctp_send_ecn_echo(stcb, net, high_tsn);
5637         }
5638         if ((data_processed == 0) && (fwd_tsn_seen)) {
5639                 int was_a_gap;
5640                 uint32_t highest_tsn;
5641
5642                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
5643                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
5644                 } else {
5645                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
5646                 }
5647                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
5648                 stcb->asoc.send_sack = 1;
5649                 sctp_sack_check(stcb, was_a_gap, &abort_flag);
5650                 if (abort_flag) {
5651                         /* Again, we aborted so NO UNLOCK needed */
5652                         goto out_now;
5653                 }
5654         } else if (fwd_tsn_seen) {
5655                 stcb->asoc.send_sack = 1;
5656         }
5657         /* trigger send of any chunks in queue... */
5658 trigger_send:
5659 #ifdef SCTP_AUDITING_ENABLED
5660         sctp_audit_log(0xE0, 2);
5661         sctp_auditing(1, inp, stcb, net);
5662 #endif
5663         SCTPDBG(SCTP_DEBUG_INPUT1,
5664             "Check for chunk output prw:%d tqe:%d tf=%d\n",
5665             stcb->asoc.peers_rwnd,
5666             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
5667             stcb->asoc.total_flight);
5668         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
5669         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
5670                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
5671         }
5672         if (cnt_ctrl_ready ||
5673             ((un_sent) &&
5674             (stcb->asoc.peers_rwnd > 0 ||
5675             (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
5676                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
5677                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5678                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
5679         }
5680 #ifdef SCTP_AUDITING_ENABLED
5681         sctp_audit_log(0xE0, 3);
5682         sctp_auditing(2, inp, stcb, net);
5683 #endif
5684         SCTP_TCB_UNLOCK(stcb);
5685 out_now:
5686 #ifdef INVARIANTS
5687         sctp_validate_no_locks(inp);
5688 #endif
5689         return;
5690 }
5691
5692 #if 0
5693 static void
5694 sctp_print_mbuf_chain(struct mbuf *m)
5695 {
5696         for (; m; m = SCTP_BUF_NEXT(m)) {
5697                 printf("%p: m_len = %ld\n", m, SCTP_BUF_LEN(m));
5698                 if (SCTP_BUF_IS_EXTENDED(m))
5699                         printf("%p: extend_size = %d\n", m, SCTP_BUF_EXTEND_SIZE(m));
5700         }
5701 }
5702
5703 #endif
5704
5705 void
5706 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
5707 {
5708 #ifdef SCTP_MBUF_LOGGING
5709         struct mbuf *mat;
5710
5711 #endif
5712         struct mbuf *m;
5713         int iphlen;
5714         uint32_t vrf_id = 0;
5715         uint8_t ecn_bits;
5716         struct ip *ip;
5717         struct sctphdr *sh;
5718         struct sctp_inpcb *inp = NULL;
5719         struct sctp_nets *net;
5720         struct sctp_tcb *stcb = NULL;
5721         struct sctp_chunkhdr *ch;
5722         int refcount_up = 0;
5723         int length, mlen, offset;
5724
5725 #if !defined(SCTP_WITH_NO_CSUM)
5726         uint32_t check, calc_check;
5727
5728 #endif
5729
5730         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
5731                 SCTP_RELEASE_PKT(i_pak);
5732                 return;
5733         }
5734         mlen = SCTP_HEADER_LEN(i_pak);
5735         iphlen = off;
5736         m = SCTP_HEADER_TO_CHAIN(i_pak);
5737
5738         net = NULL;
5739         SCTP_STAT_INCR(sctps_recvpackets);
5740         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
5741
5742
5743 #ifdef SCTP_MBUF_LOGGING
5744         /* Log in any input mbufs */
5745         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5746                 mat = m;
5747                 while (mat) {
5748                         if (SCTP_BUF_IS_EXTENDED(mat)) {
5749                                 sctp_log_mb(mat, SCTP_MBUF_INPUT);
5750                         }
5751                         mat = SCTP_BUF_NEXT(mat);
5752                 }
5753         }
5754 #endif
5755 #ifdef  SCTP_PACKET_LOGGING
5756         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
5757                 sctp_packet_log(m, mlen);
5758 #endif
5759         /*
5760          * Must take out the iphlen, since mlen expects this (only effect lb
5761          * case)
5762          */
5763         mlen -= iphlen;
5764
5765         /*
5766          * Get IP, SCTP, and first chunk header together in first mbuf.
5767          */
5768         ip = mtod(m, struct ip *);
5769         offset = iphlen + sizeof(*sh) + sizeof(*ch);
5770         if (SCTP_BUF_LEN(m) < offset) {
5771                 if ((m = m_pullup(m, offset)) == 0) {
5772                         SCTP_STAT_INCR(sctps_hdrops);
5773                         return;
5774                 }
5775                 ip = mtod(m, struct ip *);
5776         }
5777         /* validate mbuf chain length with IP payload length */
5778         if (mlen < (SCTP_GET_IPV4_LENGTH(ip) - iphlen)) {
5779                 SCTP_STAT_INCR(sctps_hdrops);
5780                 goto bad;
5781         }
5782         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
5783         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(*sh));
5784         SCTPDBG(SCTP_DEBUG_INPUT1,
5785             "sctp_input() length:%d iphlen:%d\n", mlen, iphlen);
5786
5787         /* SCTP does not allow broadcasts or multicasts */
5788         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
5789                 goto bad;
5790         }
5791         if (SCTP_IS_IT_BROADCAST(ip->ip_dst, m)) {
5792                 /*
5793                  * We only look at broadcast if its a front state, All
5794                  * others we will not have a tcb for anyway.
5795                  */
5796                 goto bad;
5797         }
5798         /* validate SCTP checksum */
5799         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
5800             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n",
5801             m->m_pkthdr.len,
5802             if_name(m->m_pkthdr.rcvif),
5803             m->m_pkthdr.csum_flags);
5804 #if defined(SCTP_WITH_NO_CSUM)
5805         SCTP_STAT_INCR(sctps_recvnocrc);
5806 #else
5807         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
5808                 SCTP_STAT_INCR(sctps_recvhwcrc);
5809                 goto sctp_skip_csum_4;
5810         }
5811         check = sh->checksum;   /* save incoming checksum */
5812         sh->checksum = 0;       /* prepare for calc */
5813         calc_check = sctp_calculate_cksum(m, iphlen);
5814         sh->checksum = check;
5815         SCTP_STAT_INCR(sctps_recvswcrc);
5816         if (calc_check != check) {
5817                 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5818                     calc_check, check, m, mlen, iphlen);
5819
5820                 stcb = sctp_findassociation_addr(m, iphlen,
5821                     offset - sizeof(*ch),
5822                     sh, ch, &inp, &net,
5823                     vrf_id);
5824                 if ((net) && (port)) {
5825                         if (net->port == 0) {
5826                                 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr));
5827                         }
5828                         net->port = port;
5829                 }
5830                 if ((net != NULL) && (m->m_flags & M_FLOWID)) {
5831                         net->flowid = m->m_pkthdr.flowid;
5832 #ifdef INVARIANTS
5833                         net->flowidset = 1;
5834 #endif
5835                 }
5836                 if ((inp) && (stcb)) {
5837                         sctp_send_packet_dropped(stcb, net, m, iphlen, 1);
5838                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5839                 } else if ((inp != NULL) && (stcb == NULL)) {
5840                         refcount_up = 1;
5841                 }
5842                 SCTP_STAT_INCR(sctps_badsum);
5843                 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5844                 goto bad;
5845         }
5846 sctp_skip_csum_4:
5847 #endif
5848         /* destination port of 0 is illegal, based on RFC2960. */
5849         if (sh->dest_port == 0) {
5850                 SCTP_STAT_INCR(sctps_hdrops);
5851                 goto bad;
5852         }
5853         /*
5854          * Locate pcb and tcb for datagram sctp_findassociation_addr() wants
5855          * IP/SCTP/first chunk header...
5856          */
5857         stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch),
5858             sh, ch, &inp, &net, vrf_id);
5859         if ((net) && (port)) {
5860                 if (net->port == 0) {
5861                         sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr));
5862                 }
5863                 net->port = port;
5864         }
5865         if ((net != NULL) && (m->m_flags & M_FLOWID)) {
5866                 net->flowid = m->m_pkthdr.flowid;
5867 #ifdef INVARIANTS
5868                 net->flowidset = 1;
5869 #endif
5870         }
5871         /* inp's ref-count increased && stcb locked */
5872         if (inp == NULL) {
5873                 struct sctp_init_chunk *init_chk, chunk_buf;
5874
5875                 SCTP_STAT_INCR(sctps_noport);
5876 #ifdef ICMP_BANDLIM
5877                 /*
5878                  * we use the bandwidth limiting to protect against sending
5879                  * too many ABORTS all at once. In this case these count the
5880                  * same as an ICMP message.
5881                  */
5882                 if (badport_bandlim(0) < 0)
5883                         goto bad;
5884 #endif                          /* ICMP_BANDLIM */
5885                 SCTPDBG(SCTP_DEBUG_INPUT1,
5886                     "Sending a ABORT from packet entry!\n");
5887                 if (ch->chunk_type == SCTP_INITIATION) {
5888                         /*
5889                          * we do a trick here to get the INIT tag, dig in
5890                          * and get the tag from the INIT and put it in the
5891                          * common header.
5892                          */
5893                         init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m,
5894                             iphlen + sizeof(*sh), sizeof(*init_chk),
5895                             (uint8_t *) & chunk_buf);
5896                         if (init_chk != NULL)
5897                                 sh->v_tag = init_chk->init.initiate_tag;
5898                 }
5899                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5900                         sctp_send_shutdown_complete2(m, iphlen, sh, vrf_id, port);
5901                         goto bad;
5902                 }
5903                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5904                         goto bad;
5905                 }
5906                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION)
5907                         sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port);
5908                 goto bad;
5909         } else if (stcb == NULL) {
5910                 refcount_up = 1;
5911         }
5912 #ifdef IPSEC
5913         /*
5914          * I very much doubt any of the IPSEC stuff will work but I have no
5915          * idea, so I will leave it in place.
5916          */
5917         if (inp && ipsec4_in_reject(m, &inp->ip_inp.inp)) {
5918                 MODULE_GLOBAL(ipsec4stat).in_polvio++;
5919                 SCTP_STAT_INCR(sctps_hdrops);
5920                 goto bad;
5921         }
5922 #endif                          /* IPSEC */
5923
5924         /*
5925          * common chunk processing
5926          */
5927         length = ip->ip_len + iphlen;
5928         offset -= sizeof(struct sctp_chunkhdr);
5929
5930         ecn_bits = ip->ip_tos;
5931
5932         /* sa_ignore NO_NULL_CHK */
5933         sctp_common_input_processing(&m, iphlen, offset, length, sh, ch,
5934             inp, stcb, net, ecn_bits, vrf_id, port);
5935         /* inp's ref-count reduced && stcb unlocked */
5936         if (m) {
5937                 sctp_m_freem(m);
5938         }
5939         if ((inp) && (refcount_up)) {
5940                 /* reduce ref-count */
5941                 SCTP_INP_DECR_REF(inp);
5942         }
5943         return;
5944 bad:
5945         if (stcb) {
5946                 SCTP_TCB_UNLOCK(stcb);
5947         }
5948         if ((inp) && (refcount_up)) {
5949                 /* reduce ref-count */
5950                 SCTP_INP_DECR_REF(inp);
5951         }
5952         if (m) {
5953                 sctp_m_freem(m);
5954         }
5955         return;
5956 }
5957
5958 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
5959 extern int *sctp_cpuarry;
5960
5961 #endif
5962
5963 void
5964 sctp_input(struct mbuf *m, int off)
5965 {
5966 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
5967         struct ip *ip;
5968         struct sctphdr *sh;
5969         int offset;
5970         int cpu_to_use;
5971         uint32_t flowid, tag;
5972
5973         if (mp_ncpus > 1) {
5974                 if (m->m_flags & M_FLOWID) {
5975                         flowid = m->m_pkthdr.flowid;
5976                 } else {
5977                         /*
5978                          * No flow id built by lower layers fix it so we
5979                          * create one.
5980                          */
5981                         ip = mtod(m, struct ip *);
5982                         offset = off + sizeof(*sh);
5983                         if (SCTP_BUF_LEN(m) < offset) {
5984                                 if ((m = m_pullup(m, offset)) == 0) {
5985                                         SCTP_STAT_INCR(sctps_hdrops);
5986                                         return;
5987                                 }
5988                                 ip = mtod(m, struct ip *);
5989                         }
5990                         sh = (struct sctphdr *)((caddr_t)ip + off);
5991                         tag = htonl(sh->v_tag);
5992                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
5993                         m->m_pkthdr.flowid = flowid;
5994                         m->m_flags |= M_FLOWID;
5995                 }
5996                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
5997                 sctp_queue_to_mcore(m, off, cpu_to_use);
5998                 return;
5999         }
6000 #endif
6001         sctp_input_with_port(m, off, 0);
6002 }