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                         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2871                                 SCTP_SOCKET_UNLOCK(so, 1);
2872                                 return;
2873                         }
2874 #endif
2875                         soisconnected(stcb->sctp_socket);
2876 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2877                         SCTP_SOCKET_UNLOCK(so, 1);
2878 #endif
2879                 }
2880                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2881                     stcb, net);
2882                 /*
2883                  * since we did not send a HB make sure we don't double
2884                  * things
2885                  */
2886                 net->hb_responded = 1;
2887
2888                 if (stcb->asoc.sctp_autoclose_ticks &&
2889                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2890                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2891                             stcb->sctp_ep, stcb, NULL);
2892                 }
2893                 /*
2894                  * send ASCONF if parameters are pending and ASCONFs are
2895                  * allowed (eg. addresses changed when init/cookie echo were
2896                  * in flight)
2897                  */
2898                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2899                     (stcb->asoc.peer_supports_asconf) &&
2900                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2901 #ifdef SCTP_TIMER_BASED_ASCONF
2902                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2903                             stcb->sctp_ep, stcb,
2904                             stcb->asoc.primary_destination);
2905 #else
2906                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2907                             SCTP_ADDR_NOT_LOCKED);
2908 #endif
2909                 }
2910         }
2911         /* Toss the cookie if I can */
2912         sctp_toss_old_cookies(stcb, asoc);
2913         if (!TAILQ_EMPTY(&asoc->sent_queue)) {
2914                 /* Restart the timer if we have pending data */
2915                 struct sctp_tmit_chunk *chk;
2916
2917                 chk = TAILQ_FIRST(&asoc->sent_queue);
2918                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
2919         }
2920 }
2921
2922 static void
2923 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
2924     struct sctp_tcb *stcb)
2925 {
2926         struct sctp_nets *net;
2927         struct sctp_tmit_chunk *lchk;
2928         struct sctp_ecne_chunk bkup;
2929         uint8_t override_bit = 0;
2930         uint32_t tsn, window_data_tsn;
2931         int len;
2932         unsigned int pkt_cnt;
2933
2934         len = ntohs(cp->ch.chunk_length);
2935         if ((len != sizeof(struct sctp_ecne_chunk)) &&
2936             (len != sizeof(struct old_sctp_ecne_chunk))) {
2937                 return;
2938         }
2939         if (len == sizeof(struct old_sctp_ecne_chunk)) {
2940                 /* Its the old format */
2941                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
2942                 bkup.num_pkts_since_cwr = htonl(1);
2943                 cp = &bkup;
2944         }
2945         SCTP_STAT_INCR(sctps_recvecne);
2946         tsn = ntohl(cp->tsn);
2947         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
2948         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
2949         if (lchk == NULL) {
2950                 window_data_tsn = stcb->asoc.sending_seq - 1;
2951         } else {
2952                 window_data_tsn = lchk->rec.data.TSN_seq;
2953         }
2954
2955         /* Find where it was sent to if possible. */
2956         net = NULL;
2957         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
2958                 if (lchk->rec.data.TSN_seq == tsn) {
2959                         net = lchk->whoTo;
2960                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
2961                         break;
2962                 }
2963                 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) {
2964                         break;
2965                 }
2966         }
2967         if (net == NULL) {
2968                 /*
2969                  * What to do. A previous send of a CWR was possibly lost.
2970                  * See how old it is, we may have it marked on the actual
2971                  * net.
2972                  */
2973                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
2974                         if (tsn == net->last_cwr_tsn) {
2975                                 /* Found him, send it off */
2976                                 goto out;
2977                         }
2978                 }
2979                 /*
2980                  * If we reach here, we need to send a special CWR that says
2981                  * hey, we did this a long time ago and you lost the
2982                  * response.
2983                  */
2984                 net = TAILQ_FIRST(&stcb->asoc.nets);
2985                 override_bit = SCTP_CWR_REDUCE_OVERRIDE;
2986         }
2987 out:
2988         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
2989             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
2990                 /*
2991                  * JRS - Use the congestion control given in the pluggable
2992                  * CC module
2993                  */
2994                 int ocwnd;
2995
2996                 ocwnd = net->cwnd;
2997                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
2998                 /*
2999                  * We reduce once every RTT. So we will only lower cwnd at
3000                  * the next sending seq i.e. the window_data_tsn
3001                  */
3002                 net->cwr_window_tsn = window_data_tsn;
3003                 net->ecn_ce_pkt_cnt += pkt_cnt;
3004                 net->lost_cnt = pkt_cnt;
3005                 net->last_cwr_tsn = tsn;
3006         } else {
3007                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
3008                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
3009                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3010                         /*
3011                          * Another loss in the same window update how many
3012                          * marks/packets lost we have had.
3013                          */
3014                         int cnt = 1;
3015
3016                         if (pkt_cnt > net->lost_cnt) {
3017                                 /* Should be the case */
3018                                 cnt = (pkt_cnt - net->lost_cnt);
3019                                 net->ecn_ce_pkt_cnt += cnt;
3020                         }
3021                         net->lost_cnt = pkt_cnt;
3022                         net->last_cwr_tsn = tsn;
3023                         /*
3024                          * Most CC functions will ignore this call, since we
3025                          * are in-window yet of the initial CE the peer saw.
3026                          */
3027                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
3028                 }
3029         }
3030         /*
3031          * We always send a CWR this way if our previous one was lost our
3032          * peer will get an update, or if it is not time again to reduce we
3033          * still get the cwr to the peer. Note we set the override when we
3034          * could not find the TSN on the chunk or the destination network.
3035          */
3036         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
3037 }
3038
3039 static void
3040 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3041 {
3042         /*
3043          * Here we get a CWR from the peer. We must look in the outqueue and
3044          * make sure that we have a covered ECNE in teh control chunk part.
3045          * If so remove it.
3046          */
3047         struct sctp_tmit_chunk *chk;
3048         struct sctp_ecne_chunk *ecne;
3049         int override;
3050         uint32_t cwr_tsn;
3051
3052         cwr_tsn = ntohl(cp->tsn);
3053
3054         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3055         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
3056                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3057                         continue;
3058                 }
3059                 if ((override == 0) && (chk->whoTo != net)) {
3060                         /* Must be from the right src unless override is set */
3061                         continue;
3062                 }
3063                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3064                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3065                         /* this covers this ECNE, we can remove it */
3066                         stcb->asoc.ecn_echo_cnt_onq--;
3067                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3068                             sctp_next);
3069                         if (chk->data) {
3070                                 sctp_m_freem(chk->data);
3071                                 chk->data = NULL;
3072                         }
3073                         stcb->asoc.ctrl_queue_cnt--;
3074                         sctp_free_a_chunk(stcb, chk);
3075                         if (override == 0) {
3076                                 break;
3077                         }
3078                 }
3079         }
3080 }
3081
3082 static void
3083 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp,
3084     struct sctp_tcb *stcb, struct sctp_nets *net)
3085 {
3086         struct sctp_association *asoc;
3087
3088 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3089         struct socket *so;
3090
3091 #endif
3092
3093         SCTPDBG(SCTP_DEBUG_INPUT2,
3094             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3095         if (stcb == NULL)
3096                 return;
3097
3098         asoc = &stcb->asoc;
3099         /* process according to association state */
3100         if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3101                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3102                 SCTPDBG(SCTP_DEBUG_INPUT2,
3103                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3104                 SCTP_TCB_UNLOCK(stcb);
3105                 return;
3106         }
3107         /* notify upper layer protocol */
3108         if (stcb->sctp_socket) {
3109                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3110                 /* are the queues empty? they should be */
3111                 if (!TAILQ_EMPTY(&asoc->send_queue) ||
3112                     !TAILQ_EMPTY(&asoc->sent_queue) ||
3113                     !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
3114                         sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED);
3115                 }
3116         }
3117         /* stop the timer */
3118         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
3119         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3120         /* free the TCB */
3121         SCTPDBG(SCTP_DEBUG_INPUT2,
3122             "sctp_handle_shutdown_complete: calls free-asoc\n");
3123 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3124         so = SCTP_INP_SO(stcb->sctp_ep);
3125         atomic_add_int(&stcb->asoc.refcnt, 1);
3126         SCTP_TCB_UNLOCK(stcb);
3127         SCTP_SOCKET_LOCK(so, 1);
3128         SCTP_TCB_LOCK(stcb);
3129         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3130 #endif
3131         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
3132 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3133         SCTP_SOCKET_UNLOCK(so, 1);
3134 #endif
3135         return;
3136 }
3137
3138 static int
3139 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3140     struct sctp_nets *net, uint8_t flg)
3141 {
3142         switch (desc->chunk_type) {
3143         case SCTP_DATA:
3144                 /* find the tsn to resend (possibly */
3145                 {
3146                         uint32_t tsn;
3147                         struct sctp_tmit_chunk *tp1;
3148
3149                         tsn = ntohl(desc->tsn_ifany);
3150                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3151                                 if (tp1->rec.data.TSN_seq == tsn) {
3152                                         /* found it */
3153                                         break;
3154                                 }
3155                                 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) {
3156                                         /* not found */
3157                                         tp1 = NULL;
3158                                         break;
3159                                 }
3160                         }
3161                         if (tp1 == NULL) {
3162                                 /*
3163                                  * Do it the other way , aka without paying
3164                                  * attention to queue seq order.
3165                                  */
3166                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3167                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3168                                         if (tp1->rec.data.TSN_seq == tsn) {
3169                                                 /* found it */
3170                                                 break;
3171                                         }
3172                                 }
3173                         }
3174                         if (tp1 == NULL) {
3175                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3176                         }
3177                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3178                                 uint8_t *ddp;
3179
3180                                 if (((flg & SCTP_BADCRC) == 0) &&
3181                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3182                                         return (0);
3183                                 }
3184                                 if ((stcb->asoc.peers_rwnd == 0) &&
3185                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3186                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3187                                         return (0);
3188                                 }
3189                                 if (stcb->asoc.peers_rwnd == 0 &&
3190                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3191                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3192                                         return (0);
3193                                 }
3194                                 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+
3195                                     sizeof(struct sctp_data_chunk));
3196                                 {
3197                                         unsigned int iii;
3198
3199                                         for (iii = 0; iii < sizeof(desc->data_bytes);
3200                                             iii++) {
3201                                                 if (ddp[iii] != desc->data_bytes[iii]) {
3202                                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3203                                                         return (-1);
3204                                                 }
3205                                         }
3206                                 }
3207
3208                                 if (tp1->do_rtt) {
3209                                         /*
3210                                          * this guy had a RTO calculation
3211                                          * pending on it, cancel it
3212                                          */
3213                                         tp1->do_rtt = 0;
3214                                 }
3215                                 SCTP_STAT_INCR(sctps_pdrpmark);
3216                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3217                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3218                                 /*
3219                                  * mark it as if we were doing a FR, since
3220                                  * we will be getting gap ack reports behind
3221                                  * the info from the router.
3222                                  */
3223                                 tp1->rec.data.doing_fast_retransmit = 1;
3224                                 /*
3225                                  * mark the tsn with what sequences can
3226                                  * cause a new FR.
3227                                  */
3228                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3229                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3230                                 } else {
3231                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
3232                                 }
3233
3234                                 /* restart the timer */
3235                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3236                                     stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3237                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3238                                     stcb, tp1->whoTo);
3239
3240                                 /* fix counts and things */
3241                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3242                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3243                                             tp1->whoTo->flight_size,
3244                                             tp1->book_size,
3245                                             (uintptr_t) stcb,
3246                                             tp1->rec.data.TSN_seq);
3247                                 }
3248                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3249                                         sctp_flight_size_decrease(tp1);
3250                                         sctp_total_flight_decrease(stcb, tp1);
3251                                 }
3252                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3253                         } {
3254                                 /* audit code */
3255                                 unsigned int audit;
3256
3257                                 audit = 0;
3258                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3259                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3260                                                 audit++;
3261                                 }
3262                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3263                                     sctp_next) {
3264                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3265                                                 audit++;
3266                                 }
3267                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3268                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3269                                             audit, stcb->asoc.sent_queue_retran_cnt);
3270 #ifndef SCTP_AUDITING_ENABLED
3271                                         stcb->asoc.sent_queue_retran_cnt = audit;
3272 #endif
3273                                 }
3274                         }
3275                 }
3276                 break;
3277         case SCTP_ASCONF:
3278                 {
3279                         struct sctp_tmit_chunk *asconf;
3280
3281                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3282                             sctp_next) {
3283                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3284                                         break;
3285                                 }
3286                         }
3287                         if (asconf) {
3288                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3289                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3290                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3291                                 asconf->snd_count--;
3292                         }
3293                 }
3294                 break;
3295         case SCTP_INITIATION:
3296                 /* resend the INIT */
3297                 stcb->asoc.dropped_special_cnt++;
3298                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3299                         /*
3300                          * If we can get it in, in a few attempts we do
3301                          * this, otherwise we let the timer fire.
3302                          */
3303                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3304                             stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3305                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3306                 }
3307                 break;
3308         case SCTP_SELECTIVE_ACK:
3309         case SCTP_NR_SELECTIVE_ACK:
3310                 /* resend the sack */
3311                 sctp_send_sack(stcb);
3312                 break;
3313         case SCTP_HEARTBEAT_REQUEST:
3314                 /* resend a demand HB */
3315                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3316                         /*
3317                          * Only retransmit if we KNOW we wont destroy the
3318                          * tcb
3319                          */
3320                         (void)sctp_send_hb(stcb, 1, net);
3321                 }
3322                 break;
3323         case SCTP_SHUTDOWN:
3324                 sctp_send_shutdown(stcb, net);
3325                 break;
3326         case SCTP_SHUTDOWN_ACK:
3327                 sctp_send_shutdown_ack(stcb, net);
3328                 break;
3329         case SCTP_COOKIE_ECHO:
3330                 {
3331                         struct sctp_tmit_chunk *cookie;
3332
3333                         cookie = NULL;
3334                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3335                             sctp_next) {
3336                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3337                                         break;
3338                                 }
3339                         }
3340                         if (cookie) {
3341                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3342                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3343                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3344                                 sctp_stop_all_cookie_timers(stcb);
3345                         }
3346                 }
3347                 break;
3348         case SCTP_COOKIE_ACK:
3349                 sctp_send_cookie_ack(stcb);
3350                 break;
3351         case SCTP_ASCONF_ACK:
3352                 /* resend last asconf ack */
3353                 sctp_send_asconf_ack(stcb);
3354                 break;
3355         case SCTP_FORWARD_CUM_TSN:
3356                 send_forward_tsn(stcb, &stcb->asoc);
3357                 break;
3358                 /* can't do anything with these */
3359         case SCTP_PACKET_DROPPED:
3360         case SCTP_INITIATION_ACK:       /* this should not happen */
3361         case SCTP_HEARTBEAT_ACK:
3362         case SCTP_ABORT_ASSOCIATION:
3363         case SCTP_OPERATION_ERROR:
3364         case SCTP_SHUTDOWN_COMPLETE:
3365         case SCTP_ECN_ECHO:
3366         case SCTP_ECN_CWR:
3367         default:
3368                 break;
3369         }
3370         return (0);
3371 }
3372
3373 void
3374 sctp_reset_in_stream(struct sctp_tcb *stcb, int number_entries, uint16_t * list)
3375 {
3376         int i;
3377         uint16_t temp;
3378
3379         /*
3380          * We set things to 0xffff since this is the last delivered sequence
3381          * and we will be sending in 0 after the reset.
3382          */
3383
3384         if (number_entries) {
3385                 for (i = 0; i < number_entries; i++) {
3386                         temp = ntohs(list[i]);
3387                         if (temp >= stcb->asoc.streamincnt) {
3388                                 continue;
3389                         }
3390                         stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff;
3391                 }
3392         } else {
3393                 list = NULL;
3394                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3395                         stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3396                 }
3397         }
3398         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3399 }
3400
3401 static void
3402 sctp_reset_out_streams(struct sctp_tcb *stcb, int number_entries, uint16_t * list)
3403 {
3404         int i;
3405
3406         if (number_entries == 0) {
3407                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3408                         stcb->asoc.strmout[i].next_sequence_sent = 0;
3409                 }
3410         } else if (number_entries) {
3411                 for (i = 0; i < number_entries; i++) {
3412                         uint16_t temp;
3413
3414                         temp = ntohs(list[i]);
3415                         if (temp >= stcb->asoc.streamoutcnt) {
3416                                 /* no such stream */
3417                                 continue;
3418                         }
3419                         stcb->asoc.strmout[temp].next_sequence_sent = 0;
3420                 }
3421         }
3422         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3423 }
3424
3425
3426 struct sctp_stream_reset_out_request *
3427 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3428 {
3429         struct sctp_association *asoc;
3430         struct sctp_stream_reset_out_req *req;
3431         struct sctp_stream_reset_out_request *r;
3432         struct sctp_tmit_chunk *chk;
3433         int len, clen;
3434
3435         asoc = &stcb->asoc;
3436         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3437                 asoc->stream_reset_outstanding = 0;
3438                 return (NULL);
3439         }
3440         if (stcb->asoc.str_reset == NULL) {
3441                 asoc->stream_reset_outstanding = 0;
3442                 return (NULL);
3443         }
3444         chk = stcb->asoc.str_reset;
3445         if (chk->data == NULL) {
3446                 return (NULL);
3447         }
3448         if (bchk) {
3449                 /* he wants a copy of the chk pointer */
3450                 *bchk = chk;
3451         }
3452         clen = chk->send_size;
3453         req = mtod(chk->data, struct sctp_stream_reset_out_req *);
3454         r = &req->sr_req;
3455         if (ntohl(r->request_seq) == seq) {
3456                 /* found it */
3457                 return (r);
3458         }
3459         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3460         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3461                 /* move to the next one, there can only be a max of two */
3462                 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len);
3463                 if (ntohl(r->request_seq) == seq) {
3464                         return (r);
3465                 }
3466         }
3467         /* that seq is not here */
3468         return (NULL);
3469 }
3470
3471 static void
3472 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3473 {
3474         struct sctp_association *asoc;
3475         struct sctp_tmit_chunk *chk = stcb->asoc.str_reset;
3476
3477         if (stcb->asoc.str_reset == NULL) {
3478                 return;
3479         }
3480         asoc = &stcb->asoc;
3481
3482         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3483         TAILQ_REMOVE(&asoc->control_send_queue,
3484             chk,
3485             sctp_next);
3486         if (chk->data) {
3487                 sctp_m_freem(chk->data);
3488                 chk->data = NULL;
3489         }
3490         asoc->ctrl_queue_cnt--;
3491         sctp_free_a_chunk(stcb, chk);
3492         /* sa_ignore NO_NULL_CHK */
3493         stcb->asoc.str_reset = NULL;
3494 }
3495
3496
3497 static int
3498 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3499     uint32_t seq, uint32_t action,
3500     struct sctp_stream_reset_response *respin)
3501 {
3502         uint16_t type;
3503         int lparm_len;
3504         struct sctp_association *asoc = &stcb->asoc;
3505         struct sctp_tmit_chunk *chk;
3506         struct sctp_stream_reset_out_request *srparam;
3507         int number_entries;
3508
3509         if (asoc->stream_reset_outstanding == 0) {
3510                 /* duplicate */
3511                 return (0);
3512         }
3513         if (seq == stcb->asoc.str_reset_seq_out) {
3514                 srparam = sctp_find_stream_reset(stcb, seq, &chk);
3515                 if (srparam) {
3516                         stcb->asoc.str_reset_seq_out++;
3517                         type = ntohs(srparam->ph.param_type);
3518                         lparm_len = ntohs(srparam->ph.param_length);
3519                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3520                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3521                                 asoc->stream_reset_out_is_outstanding = 0;
3522                                 if (asoc->stream_reset_outstanding)
3523                                         asoc->stream_reset_outstanding--;
3524                                 if (action == SCTP_STREAM_RESET_PERFORMED) {
3525                                         /* do it */
3526                                         sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams);
3527                                 } else {
3528                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3529                                 }
3530                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3531                                 /* Answered my request */
3532                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3533                                 if (asoc->stream_reset_outstanding)
3534                                         asoc->stream_reset_outstanding--;
3535                                 if (action != SCTP_STREAM_RESET_PERFORMED) {
3536                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3537                                 }
3538                         } else if (type == SCTP_STR_RESET_ADD_STREAMS) {
3539                                 /* Ok we now may have more streams */
3540                                 if (asoc->stream_reset_outstanding)
3541                                         asoc->stream_reset_outstanding--;
3542                                 if (action == SCTP_STREAM_RESET_PERFORMED) {
3543                                         /* Put the new streams into effect */
3544                                         stcb->asoc.streamoutcnt = stcb->asoc.strm_realoutsize;
3545                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD_OK, stcb,
3546                                             (uint32_t) stcb->asoc.streamoutcnt, NULL, SCTP_SO_NOT_LOCKED);
3547                                 } else {
3548                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD_FAIL, stcb,
3549                                             (uint32_t) stcb->asoc.streamoutcnt, NULL, SCTP_SO_NOT_LOCKED);
3550                                 }
3551                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3552                                 /**
3553                                  * a) Adopt the new in tsn.
3554                                  * b) reset the map
3555                                  * c) Adopt the new out-tsn
3556                                  */
3557                                 struct sctp_stream_reset_response_tsn *resp;
3558                                 struct sctp_forward_tsn_chunk fwdtsn;
3559                                 int abort_flag = 0;
3560
3561                                 if (respin == NULL) {
3562                                         /* huh ? */
3563                                         return (0);
3564                                 }
3565                                 if (action == SCTP_STREAM_RESET_PERFORMED) {
3566                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3567                                         asoc->stream_reset_outstanding--;
3568                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3569                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3570                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3571                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3572                                         if (abort_flag) {
3573                                                 return (1);
3574                                         }
3575                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3576                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3577                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3578                                         }
3579                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3580                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3581                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3582
3583                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3584                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3585
3586                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3587                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3588
3589                                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3590                                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3591
3592                                 }
3593                         }
3594                         /* get rid of the request and get the request flags */
3595                         if (asoc->stream_reset_outstanding == 0) {
3596                                 sctp_clean_up_stream_reset(stcb);
3597                         }
3598                 }
3599         }
3600         return (0);
3601 }
3602
3603 static void
3604 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3605     struct sctp_tmit_chunk *chk,
3606     struct sctp_stream_reset_in_request *req, int trunc)
3607 {
3608         uint32_t seq;
3609         int len, i;
3610         int number_entries;
3611         uint16_t temp;
3612
3613         /*
3614          * peer wants me to send a str-reset to him for my outgoing seq's if
3615          * seq_in is right.
3616          */
3617         struct sctp_association *asoc = &stcb->asoc;
3618
3619         seq = ntohl(req->request_seq);
3620         if (asoc->str_reset_seq_in == seq) {
3621                 if (trunc) {
3622                         /* Can't do it, since they exceeded our buffer size  */
3623                         asoc->last_reset_action[1] = asoc->last_reset_action[0];
3624                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
3625                         sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3626                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3627                         len = ntohs(req->ph.param_length);
3628                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3629                         for (i = 0; i < number_entries; i++) {
3630                                 temp = ntohs(req->list_of_streams[i]);
3631                                 req->list_of_streams[i] = temp;
3632                         }
3633                         /* move the reset action back one */
3634                         asoc->last_reset_action[1] = asoc->last_reset_action[0];
3635                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3636                         sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams,
3637                             asoc->str_reset_seq_out,
3638                             seq, (asoc->sending_seq - 1));
3639                         asoc->stream_reset_out_is_outstanding = 1;
3640                         asoc->str_reset = chk;
3641                         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
3642                         stcb->asoc.stream_reset_outstanding++;
3643                 } else {
3644                         /* Can't do it, since we have sent one out */
3645                         asoc->last_reset_action[1] = asoc->last_reset_action[0];
3646                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_TRY_LATER;
3647                         sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3648                 }
3649                 asoc->str_reset_seq_in++;
3650         } else if (asoc->str_reset_seq_in - 1 == seq) {
3651                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3652         } else if (asoc->str_reset_seq_in - 2 == seq) {
3653                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3654         } else {
3655                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
3656         }
3657 }
3658
3659 static int
3660 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3661     struct sctp_tmit_chunk *chk,
3662     struct sctp_stream_reset_tsn_request *req)
3663 {
3664         /* reset all in and out and update the tsn */
3665         /*
3666          * A) reset my str-seq's on in and out. B) Select a receive next,
3667          * and set cum-ack to it. Also process this selected number as a
3668          * fwd-tsn as well. C) set in the response my next sending seq.
3669          */
3670         struct sctp_forward_tsn_chunk fwdtsn;
3671         struct sctp_association *asoc = &stcb->asoc;
3672         int abort_flag = 0;
3673         uint32_t seq;
3674
3675         seq = ntohl(req->request_seq);
3676         if (asoc->str_reset_seq_in == seq) {
3677                 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3678                 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3679                 fwdtsn.ch.chunk_flags = 0;
3680                 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3681                 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3682                 if (abort_flag) {
3683                         return (1);
3684                 }
3685                 stcb->asoc.highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3686                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3687                         sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3688                 }
3689                 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3690                 stcb->asoc.mapping_array_base_tsn = stcb->asoc.highest_tsn_inside_map + 1;
3691                 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3692                 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3693                 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3694                 atomic_add_int(&stcb->asoc.sending_seq, 1);
3695                 /* save off historical data for retrans */
3696                 stcb->asoc.last_sending_seq[1] = stcb->asoc.last_sending_seq[0];
3697                 stcb->asoc.last_sending_seq[0] = stcb->asoc.sending_seq;
3698                 stcb->asoc.last_base_tsnsent[1] = stcb->asoc.last_base_tsnsent[0];
3699                 stcb->asoc.last_base_tsnsent[0] = stcb->asoc.mapping_array_base_tsn;
3700
3701                 sctp_add_stream_reset_result_tsn(chk,
3702                     ntohl(req->request_seq),
3703                     SCTP_STREAM_RESET_PERFORMED,
3704                     stcb->asoc.sending_seq,
3705                     stcb->asoc.mapping_array_base_tsn);
3706                 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3707                 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3708                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3709                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3710
3711                 asoc->str_reset_seq_in++;
3712         } else if (asoc->str_reset_seq_in - 1 == seq) {
3713                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3714                     stcb->asoc.last_sending_seq[0],
3715                     stcb->asoc.last_base_tsnsent[0]
3716                     );
3717         } else if (asoc->str_reset_seq_in - 2 == seq) {
3718                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3719                     stcb->asoc.last_sending_seq[1],
3720                     stcb->asoc.last_base_tsnsent[1]
3721                     );
3722         } else {
3723                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
3724         }
3725         return (0);
3726 }
3727
3728 static void
3729 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3730     struct sctp_tmit_chunk *chk,
3731     struct sctp_stream_reset_out_request *req, int trunc)
3732 {
3733         uint32_t seq, tsn;
3734         int number_entries, len;
3735         struct sctp_association *asoc = &stcb->asoc;
3736
3737         seq = ntohl(req->request_seq);
3738
3739         /* now if its not a duplicate we process it */
3740         if (asoc->str_reset_seq_in == seq) {
3741                 len = ntohs(req->ph.param_length);
3742                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3743                 /*
3744                  * the sender is resetting, handle the list issue.. we must
3745                  * a) verify if we can do the reset, if so no problem b) If
3746                  * we can't do the reset we must copy the request. c) queue
3747                  * it, and setup the data in processor to trigger it off
3748                  * when needed and dequeue all the queued data.
3749                  */
3750                 tsn = ntohl(req->send_reset_at_tsn);
3751
3752                 /* move the reset action back one */
3753                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3754                 if (trunc) {
3755                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED);
3756                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
3757                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3758                         /* we can do it now */
3759                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3760                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED);
3761                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3762                 } else {
3763                         /*
3764                          * we must queue it up and thus wait for the TSN's
3765                          * to arrive that are at or before tsn
3766                          */
3767                         struct sctp_stream_reset_list *liste;
3768                         int siz;
3769
3770                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3771                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3772                             siz, SCTP_M_STRESET);
3773                         if (liste == NULL) {
3774                                 /* gak out of memory */
3775                                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED);
3776                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
3777                                 return;
3778                         }
3779                         liste->tsn = tsn;
3780                         liste->number_entries = number_entries;
3781                         memcpy(&liste->req, req,
3782                             (sizeof(struct sctp_stream_reset_out_request) + (number_entries * sizeof(uint16_t))));
3783                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3784                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED);
3785                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3786                 }
3787                 asoc->str_reset_seq_in++;
3788         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3789                 /*
3790                  * one seq back, just echo back last action since my
3791                  * response was lost.
3792                  */
3793                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3794         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3795                 /*
3796                  * two seq back, just echo back last action since my
3797                  * response was lost.
3798                  */
3799                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3800         } else {
3801                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
3802         }
3803 }
3804
3805 static void
3806 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3807     struct sctp_stream_reset_add_strm *str_add)
3808 {
3809         /*
3810          * Peer is requesting to add more streams. If its within our
3811          * max-streams we will allow it.
3812          */
3813         uint16_t num_stream, i;
3814         uint32_t seq;
3815         struct sctp_association *asoc = &stcb->asoc;
3816         struct sctp_queued_to_read *ctl, *nctl;
3817
3818         /* Get the number. */
3819         seq = ntohl(str_add->request_seq);
3820         num_stream = ntohs(str_add->number_of_streams);
3821         /* Now what would be the new total? */
3822         if (asoc->str_reset_seq_in == seq) {
3823                 num_stream += stcb->asoc.streamincnt;
3824                 if (num_stream > stcb->asoc.max_inbound_streams) {
3825                         /* We must reject it they ask for to many */
3826         denied:
3827                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED);
3828                         stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3829                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
3830                 } else {
3831                         /* Ok, we can do that :-) */
3832                         struct sctp_stream_in *oldstrm;
3833
3834                         /* save off the old */
3835                         oldstrm = stcb->asoc.strmin;
3836                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
3837                             (num_stream * sizeof(struct sctp_stream_in)),
3838                             SCTP_M_STRMI);
3839                         if (stcb->asoc.strmin == NULL) {
3840                                 stcb->asoc.strmin = oldstrm;
3841                                 goto denied;
3842                         }
3843                         /* copy off the old data */
3844                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
3845                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3846                                 stcb->asoc.strmin[i].stream_no = i;
3847                                 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered;
3848                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
3849                                 /* now anything on those queues? */
3850                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) {
3851                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next);
3852                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next);
3853                                 }
3854                         }
3855                         /* Init the new streams */
3856                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
3857                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3858                                 stcb->asoc.strmin[i].stream_no = i;
3859                                 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3860                                 stcb->asoc.strmin[i].delivery_started = 0;
3861                         }
3862                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
3863                         /* update the size */
3864                         stcb->asoc.streamincnt = num_stream;
3865                         /* Send the ack */
3866                         sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED);
3867                         stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3868                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3869                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_INSTREAM_ADD_OK, stcb,
3870                             (uint32_t) stcb->asoc.streamincnt, NULL, SCTP_SO_NOT_LOCKED);
3871                 }
3872         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3873                 /*
3874                  * one seq back, just echo back last action since my
3875                  * response was lost.
3876                  */
3877                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3878         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3879                 /*
3880                  * two seq back, just echo back last action since my
3881                  * response was lost.
3882                  */
3883                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3884         } else {
3885                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
3886
3887         }
3888 }
3889
3890 #ifdef __GNUC__
3891 __attribute__((noinline))
3892 #endif
3893         static int
3894             sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
3895         struct sctp_stream_reset_out_req *sr_req)
3896 {
3897         int chk_length, param_len, ptype;
3898         struct sctp_paramhdr pstore;
3899         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
3900
3901         uint32_t seq;
3902         int num_req = 0;
3903         int trunc = 0;
3904         struct sctp_tmit_chunk *chk;
3905         struct sctp_chunkhdr *ch;
3906         struct sctp_paramhdr *ph;
3907         int ret_code = 0;
3908         int num_param = 0;
3909
3910         /* now it may be a reset or a reset-response */
3911         chk_length = ntohs(sr_req->ch.chunk_length);
3912
3913         /* setup for adding the response */
3914         sctp_alloc_a_chunk(stcb, chk);
3915         if (chk == NULL) {
3916                 return (ret_code);
3917         }
3918         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
3919         chk->rec.chunk_id.can_take_data = 0;
3920         chk->asoc = &stcb->asoc;
3921         chk->no_fr_allowed = 0;
3922         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
3923         chk->book_size_scale = 0;
3924         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
3925         if (chk->data == NULL) {
3926 strres_nochunk:
3927                 if (chk->data) {
3928                         sctp_m_freem(chk->data);
3929                         chk->data = NULL;
3930                 }
3931                 sctp_free_a_chunk(stcb, chk);
3932                 return (ret_code);
3933         }
3934         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
3935
3936         /* setup chunk parameters */
3937         chk->sent = SCTP_DATAGRAM_UNSENT;
3938         chk->snd_count = 0;
3939         chk->whoTo = stcb->asoc.primary_destination;
3940         atomic_add_int(&chk->whoTo->ref_count, 1);
3941
3942         ch = mtod(chk->data, struct sctp_chunkhdr *);
3943         ch->chunk_type = SCTP_STREAM_RESET;
3944         ch->chunk_flags = 0;
3945         ch->chunk_length = htons(chk->send_size);
3946         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
3947         offset += sizeof(struct sctp_chunkhdr);
3948         while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) {
3949                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore);
3950                 if (ph == NULL)
3951                         break;
3952                 param_len = ntohs(ph->param_length);
3953                 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) {
3954                         /* bad param */
3955                         break;
3956                 }
3957                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)),
3958                     (uint8_t *) & cstore);
3959                 ptype = ntohs(ph->param_type);
3960                 num_param++;
3961                 if (param_len > (int)sizeof(cstore)) {
3962                         trunc = 1;
3963                 } else {
3964                         trunc = 0;
3965                 }
3966
3967                 if (num_param > SCTP_MAX_RESET_PARAMS) {
3968                         /* hit the max of parameters already sorry.. */
3969                         break;
3970                 }
3971                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
3972                         struct sctp_stream_reset_out_request *req_out;
3973
3974                         req_out = (struct sctp_stream_reset_out_request *)ph;
3975                         num_req++;
3976                         if (stcb->asoc.stream_reset_outstanding) {
3977                                 seq = ntohl(req_out->response_seq);
3978                                 if (seq == stcb->asoc.str_reset_seq_out) {
3979                                         /* implicit ack */
3980                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_PERFORMED, NULL);
3981                                 }
3982                         }
3983                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
3984                 } else if (ptype == SCTP_STR_RESET_ADD_STREAMS) {
3985                         struct sctp_stream_reset_add_strm *str_add;
3986
3987                         str_add = (struct sctp_stream_reset_add_strm *)ph;
3988                         num_req++;
3989                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
3990                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
3991                         struct sctp_stream_reset_in_request *req_in;
3992
3993                         num_req++;
3994
3995                         req_in = (struct sctp_stream_reset_in_request *)ph;
3996
3997                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
3998                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
3999                         struct sctp_stream_reset_tsn_request *req_tsn;
4000
4001                         num_req++;
4002                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4003
4004                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4005                                 ret_code = 1;
4006                                 goto strres_nochunk;
4007                         }
4008                         /* no more */
4009                         break;
4010                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4011                         struct sctp_stream_reset_response *resp;
4012                         uint32_t result;
4013
4014                         resp = (struct sctp_stream_reset_response *)ph;
4015                         seq = ntohl(resp->response_seq);
4016                         result = ntohl(resp->result);
4017                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4018                                 ret_code = 1;
4019                                 goto strres_nochunk;
4020                         }
4021                 } else {
4022                         break;
4023                 }
4024                 offset += SCTP_SIZE32(param_len);
4025                 chk_length -= SCTP_SIZE32(param_len);
4026         }
4027         if (num_req == 0) {
4028                 /* we have no response free the stuff */
4029                 goto strres_nochunk;
4030         }
4031         /* ok we have a chunk to link in */
4032         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4033             chk,
4034             sctp_next);
4035         stcb->asoc.ctrl_queue_cnt++;
4036         return (ret_code);
4037 }
4038
4039 /*
4040  * Handle a router or endpoints report of a packet loss, there are two ways
4041  * to handle this, either we get the whole packet and must disect it
4042  * ourselves (possibly with truncation and or corruption) or it is a summary
4043  * from a middle box that did the disectting for us.
4044  */
4045 static void
4046 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4047     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4048 {
4049         uint32_t bottle_bw, on_queue;
4050         uint16_t trunc_len;
4051         unsigned int chlen;
4052         unsigned int at;
4053         struct sctp_chunk_desc desc;
4054         struct sctp_chunkhdr *ch;
4055
4056         chlen = ntohs(cp->ch.chunk_length);
4057         chlen -= sizeof(struct sctp_pktdrop_chunk);
4058         /* XXX possible chlen underflow */
4059         if (chlen == 0) {
4060                 ch = NULL;
4061                 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
4062                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4063         } else {
4064                 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
4065                 chlen -= sizeof(struct sctphdr);
4066                 /* XXX possible chlen underflow */
4067                 memset(&desc, 0, sizeof(desc));
4068         }
4069         trunc_len = (uint16_t) ntohs(cp->trunc_len);
4070         if (trunc_len > limit) {
4071                 trunc_len = limit;
4072         }
4073         /* now the chunks themselves */
4074         while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
4075                 desc.chunk_type = ch->chunk_type;
4076                 /* get amount we need to move */
4077                 at = ntohs(ch->chunk_length);
4078                 if (at < sizeof(struct sctp_chunkhdr)) {
4079                         /* corrupt chunk, maybe at the end? */
4080                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4081                         break;
4082                 }
4083                 if (trunc_len == 0) {
4084                         /* we are supposed to have all of it */
4085                         if (at > chlen) {
4086                                 /* corrupt skip it */
4087                                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4088                                 break;
4089                         }
4090                 } else {
4091                         /* is there enough of it left ? */
4092                         if (desc.chunk_type == SCTP_DATA) {
4093                                 if (chlen < (sizeof(struct sctp_data_chunk) +
4094                                     sizeof(desc.data_bytes))) {
4095                                         break;
4096                                 }
4097                         } else {
4098                                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4099                                         break;
4100                                 }
4101                         }
4102                 }
4103                 if (desc.chunk_type == SCTP_DATA) {
4104                         /* can we get out the tsn? */
4105                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4106                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4107
4108                         if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
4109                                 /* yep */
4110                                 struct sctp_data_chunk *dcp;
4111                                 uint8_t *ddp;
4112                                 unsigned int iii;
4113
4114                                 dcp = (struct sctp_data_chunk *)ch;
4115                                 ddp = (uint8_t *) (dcp + 1);
4116                                 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
4117                                         desc.data_bytes[iii] = ddp[iii];
4118                                 }
4119                                 desc.tsn_ifany = dcp->dp.tsn;
4120                         } else {
4121                                 /* nope we are done. */
4122                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4123                                 break;
4124                         }
4125                 } else {
4126                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4127                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4128                 }
4129
4130                 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
4131                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4132                         break;
4133                 }
4134                 if (SCTP_SIZE32(at) > chlen) {
4135                         break;
4136                 }
4137                 chlen -= SCTP_SIZE32(at);
4138                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4139                         /* done, none left */
4140                         break;
4141                 }
4142                 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
4143         }
4144         /* Now update any rwnd --- possibly */
4145         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4146                 /* From a peer, we get a rwnd report */
4147                 uint32_t a_rwnd;
4148
4149                 SCTP_STAT_INCR(sctps_pdrpfehos);
4150
4151                 bottle_bw = ntohl(cp->bottle_bw);
4152                 on_queue = ntohl(cp->current_onq);
4153                 if (bottle_bw && on_queue) {
4154                         /* a rwnd report is in here */
4155                         if (bottle_bw > on_queue)
4156                                 a_rwnd = bottle_bw - on_queue;
4157                         else
4158                                 a_rwnd = 0;
4159
4160                         if (a_rwnd == 0)
4161                                 stcb->asoc.peers_rwnd = 0;
4162                         else {
4163                                 if (a_rwnd > stcb->asoc.total_flight) {
4164                                         stcb->asoc.peers_rwnd =
4165                                             a_rwnd - stcb->asoc.total_flight;
4166                                 } else {
4167                                         stcb->asoc.peers_rwnd = 0;
4168                                 }
4169                                 if (stcb->asoc.peers_rwnd <
4170                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4171                                         /* SWS sender side engages */
4172                                         stcb->asoc.peers_rwnd = 0;
4173                                 }
4174                         }
4175                 }
4176         } else {
4177                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4178         }
4179
4180         /* now middle boxes in sat networks get a cwnd bump */
4181         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
4182             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4183             (stcb->asoc.sat_network)) {
4184                 /*
4185                  * This is debateable but for sat networks it makes sense
4186                  * Note if a T3 timer has went off, we will prohibit any
4187                  * changes to cwnd until we exit the t3 loss recovery.
4188                  */
4189                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4190                     net, cp, &bottle_bw, &on_queue);
4191         }
4192 }
4193
4194 /*
4195  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4196  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4197  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4198  * length of the complete packet outputs: - length: modified to remaining
4199  * length after control processing - netp: modified to new sctp_nets after
4200  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4201  * bad packet,...) otherwise return the tcb for this packet
4202  */
4203 #ifdef __GNUC__
4204 __attribute__((noinline))
4205 #endif
4206         static struct sctp_tcb *
4207                  sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4208              struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4209              struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4210              uint32_t vrf_id, uint16_t port)
4211 {
4212         struct sctp_association *asoc;
4213         uint32_t vtag_in;
4214         int num_chunks = 0;     /* number of control chunks processed */
4215         uint32_t chk_length;
4216         int ret;
4217         int abort_no_unlock = 0;
4218         int ecne_seen = 0;
4219
4220         /*
4221          * How big should this be, and should it be alloc'd? Lets try the
4222          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4223          * until we get into jumbo grams and such..
4224          */
4225         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4226         struct sctp_tcb *locked_tcb = stcb;
4227         int got_auth = 0;
4228         uint32_t auth_offset = 0, auth_len = 0;
4229         int auth_skipped = 0;
4230         int asconf_cnt = 0;
4231
4232 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4233         struct socket *so;
4234
4235 #endif
4236
4237         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4238             iphlen, *offset, length, stcb);
4239
4240         /* validate chunk header length... */
4241         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4242                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4243                     ntohs(ch->chunk_length));
4244                 if (locked_tcb) {
4245                         SCTP_TCB_UNLOCK(locked_tcb);
4246                 }
4247                 return (NULL);
4248         }
4249         /*
4250          * validate the verification tag
4251          */
4252         vtag_in = ntohl(sh->v_tag);
4253
4254         if (locked_tcb) {
4255                 SCTP_TCB_LOCK_ASSERT(locked_tcb);
4256         }
4257         if (ch->chunk_type == SCTP_INITIATION) {
4258                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4259                     ntohs(ch->chunk_length), vtag_in);
4260                 if (vtag_in != 0) {
4261                         /* protocol error- silently discard... */
4262                         SCTP_STAT_INCR(sctps_badvtag);
4263                         if (locked_tcb) {
4264                                 SCTP_TCB_UNLOCK(locked_tcb);
4265                         }
4266                         return (NULL);
4267                 }
4268         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4269                 /*
4270                  * If there is no stcb, skip the AUTH chunk and process
4271                  * later after a stcb is found (to validate the lookup was
4272                  * valid.
4273                  */
4274                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4275                     (stcb == NULL) &&
4276                     !SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4277                         /* save this chunk for later processing */
4278                         auth_skipped = 1;
4279                         auth_offset = *offset;
4280                         auth_len = ntohs(ch->chunk_length);
4281
4282                         /* (temporarily) move past this chunk */
4283                         *offset += SCTP_SIZE32(auth_len);
4284                         if (*offset >= length) {
4285                                 /* no more data left in the mbuf chain */
4286                                 *offset = length;
4287                                 if (locked_tcb) {
4288                                         SCTP_TCB_UNLOCK(locked_tcb);
4289                                 }
4290                                 return (NULL);
4291                         }
4292                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4293                             sizeof(struct sctp_chunkhdr), chunk_buf);
4294                 }
4295                 if (ch == NULL) {
4296                         /* Help */
4297                         *offset = length;
4298                         if (locked_tcb) {
4299                                 SCTP_TCB_UNLOCK(locked_tcb);
4300                         }
4301                         return (NULL);
4302                 }
4303                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4304                         goto process_control_chunks;
4305                 }
4306                 /*
4307                  * first check if it's an ASCONF with an unknown src addr we
4308                  * need to look inside to find the association
4309                  */
4310                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4311                         struct sctp_chunkhdr *asconf_ch = ch;
4312                         uint32_t asconf_offset = 0, asconf_len = 0;
4313
4314                         /* inp's refcount may be reduced */
4315                         SCTP_INP_INCR_REF(inp);
4316
4317                         asconf_offset = *offset;
4318                         do {
4319                                 asconf_len = ntohs(asconf_ch->chunk_length);
4320                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4321                                         break;
4322                                 stcb = sctp_findassociation_ep_asconf(m, iphlen,
4323                                     *offset, sh, &inp, netp, vrf_id);
4324                                 if (stcb != NULL)
4325                                         break;
4326                                 asconf_offset += SCTP_SIZE32(asconf_len);
4327                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4328                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4329                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4330                         if (stcb == NULL) {
4331                                 /*
4332                                  * reduce inp's refcount if not reduced in
4333                                  * sctp_findassociation_ep_asconf().
4334                                  */
4335                                 SCTP_INP_DECR_REF(inp);
4336                         } else {
4337                                 locked_tcb = stcb;
4338                         }
4339
4340                         /* now go back and verify any auth chunk to be sure */
4341                         if (auth_skipped && (stcb != NULL)) {
4342                                 struct sctp_auth_chunk *auth;
4343
4344                                 auth = (struct sctp_auth_chunk *)
4345                                     sctp_m_getptr(m, auth_offset,
4346                                     auth_len, chunk_buf);
4347                                 got_auth = 1;
4348                                 auth_skipped = 0;
4349                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4350                                     auth_offset)) {
4351                                         /* auth HMAC failed so dump it */
4352                                         *offset = length;
4353                                         if (locked_tcb) {
4354                                                 SCTP_TCB_UNLOCK(locked_tcb);
4355                                         }
4356                                         return (NULL);
4357                                 } else {
4358                                         /* remaining chunks are HMAC checked */
4359                                         stcb->asoc.authenticated = 1;
4360                                 }
4361                         }
4362                 }
4363                 if (stcb == NULL) {
4364                         /* no association, so it's out of the blue... */
4365                         sctp_handle_ootb(m, iphlen, *offset, sh, inp, NULL,
4366                             vrf_id, port);
4367                         *offset = length;
4368                         if (locked_tcb) {
4369                                 SCTP_TCB_UNLOCK(locked_tcb);
4370                         }
4371                         return (NULL);
4372                 }
4373                 asoc = &stcb->asoc;
4374                 /* ABORT and SHUTDOWN can use either v_tag... */
4375                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4376                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4377                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4378                         if ((vtag_in == asoc->my_vtag) ||
4379                             ((ch->chunk_flags & SCTP_HAD_NO_TCB) &&
4380                             (vtag_in == asoc->peer_vtag))) {
4381                                 /* this is valid */
4382                         } else {
4383                                 /* drop this packet... */
4384                                 SCTP_STAT_INCR(sctps_badvtag);
4385                                 if (locked_tcb) {
4386                                         SCTP_TCB_UNLOCK(locked_tcb);
4387                                 }
4388                                 return (NULL);
4389                         }
4390                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4391                         if (vtag_in != asoc->my_vtag) {
4392                                 /*
4393                                  * this could be a stale SHUTDOWN-ACK or the
4394                                  * peer never got the SHUTDOWN-COMPLETE and
4395                                  * is still hung; we have started a new asoc
4396                                  * but it won't complete until the shutdown
4397                                  * is completed
4398                                  */
4399                                 if (locked_tcb) {
4400                                         SCTP_TCB_UNLOCK(locked_tcb);
4401                                 }
4402                                 sctp_handle_ootb(m, iphlen, *offset, sh, inp,
4403                                     NULL, vrf_id, port);
4404                                 return (NULL);
4405                         }
4406                 } else {
4407                         /* for all other chunks, vtag must match */
4408                         if (vtag_in != asoc->my_vtag) {
4409                                 /* invalid vtag... */
4410                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4411                                     "invalid vtag: %xh, expect %xh\n",
4412                                     vtag_in, asoc->my_vtag);
4413                                 SCTP_STAT_INCR(sctps_badvtag);
4414                                 if (locked_tcb) {
4415                                         SCTP_TCB_UNLOCK(locked_tcb);
4416                                 }
4417                                 *offset = length;
4418                                 return (NULL);
4419                         }
4420                 }
4421         }                       /* end if !SCTP_COOKIE_ECHO */
4422         /*
4423          * process all control chunks...
4424          */
4425         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4426         /* EY */
4427             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4428             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4429             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
4430                 /* implied cookie-ack.. we must have lost the ack */
4431                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4432                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4433                             stcb->asoc.overall_error_count,
4434                             0,
4435                             SCTP_FROM_SCTP_INPUT,
4436                             __LINE__);
4437                 }
4438                 stcb->asoc.overall_error_count = 0;
4439                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4440                     *netp);
4441         }
4442 process_control_chunks:
4443         while (IS_SCTP_CONTROL(ch)) {
4444                 /* validate chunk length */
4445                 chk_length = ntohs(ch->chunk_length);
4446                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4447                     ch->chunk_type, chk_length);
4448                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4449                 if (chk_length < sizeof(*ch) ||
4450                     (*offset + (int)chk_length) > length) {
4451                         *offset = length;
4452                         if (locked_tcb) {
4453                                 SCTP_TCB_UNLOCK(locked_tcb);
4454                         }
4455                         return (NULL);
4456                 }
4457                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4458                 /*
4459                  * INIT-ACK only gets the init ack "header" portion only
4460                  * because we don't have to process the peer's COOKIE. All
4461                  * others get a complete chunk.
4462                  */
4463                 if ((ch->chunk_type == SCTP_INITIATION_ACK) ||
4464                     (ch->chunk_type == SCTP_INITIATION)) {
4465                         /* get an init-ack chunk */
4466                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4467                             sizeof(struct sctp_init_ack_chunk), chunk_buf);
4468                         if (ch == NULL) {
4469                                 *offset = length;
4470                                 if (locked_tcb) {
4471                                         SCTP_TCB_UNLOCK(locked_tcb);
4472                                 }
4473                                 return (NULL);
4474                         }
4475                 } else {
4476                         /* For cookies and all other chunks. */
4477                         if (chk_length > sizeof(chunk_buf)) {
4478                                 /*
4479                                  * use just the size of the chunk buffer so
4480                                  * the front part of our chunks fit in
4481                                  * contiguous space up to the chunk buffer
4482                                  * size (508 bytes). For chunks that need to
4483                                  * get more than that they must use the
4484                                  * sctp_m_getptr() function or other means
4485                                  * (e.g. know how to parse mbuf chains).
4486                                  * Cookies do this already.
4487                                  */
4488                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4489                                     (sizeof(chunk_buf) - 4),
4490                                     chunk_buf);
4491                                 if (ch == NULL) {
4492                                         *offset = length;
4493                                         if (locked_tcb) {
4494                                                 SCTP_TCB_UNLOCK(locked_tcb);
4495                                         }
4496                                         return (NULL);
4497                                 }
4498                         } else {
4499                                 /* We can fit it all */
4500                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4501                                     chk_length, chunk_buf);
4502                                 if (ch == NULL) {
4503                                         SCTP_PRINTF("sctp_process_control: Can't get the all data....\n");
4504                                         *offset = length;
4505                                         if (locked_tcb) {
4506                                                 SCTP_TCB_UNLOCK(locked_tcb);
4507                                         }
4508                                         return (NULL);
4509                                 }
4510                         }
4511                 }
4512                 num_chunks++;
4513                 /* Save off the last place we got a control from */
4514                 if (stcb != NULL) {
4515                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4516                                 /*
4517                                  * allow last_control to be NULL if
4518                                  * ASCONF... ASCONF processing will find the
4519                                  * right net later
4520                                  */
4521                                 if ((netp != NULL) && (*netp != NULL))
4522                                         stcb->asoc.last_control_chunk_from = *netp;
4523                         }
4524                 }
4525 #ifdef SCTP_AUDITING_ENABLED
4526                 sctp_audit_log(0xB0, ch->chunk_type);
4527 #endif
4528
4529                 /* check to see if this chunk required auth, but isn't */
4530                 if ((stcb != NULL) &&
4531                     !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
4532                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4533                     !stcb->asoc.authenticated) {
4534                         /* "silently" ignore */
4535                         SCTP_STAT_INCR(sctps_recvauthmissing);
4536                         goto next_chunk;
4537                 }
4538                 switch (ch->chunk_type) {
4539                 case SCTP_INITIATION:
4540                         /* must be first and only chunk */
4541                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4542                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4543                                 /* We are not interested anymore? */
4544                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4545                                         /*
4546                                          * collision case where we are
4547                                          * sending to them too
4548                                          */
4549                                         ;
4550                                 } else {
4551                                         if (locked_tcb) {
4552                                                 SCTP_TCB_UNLOCK(locked_tcb);
4553                                         }
4554                                         *offset = length;
4555                                         return (NULL);
4556                                 }
4557                         }
4558                         if ((chk_length > SCTP_LARGEST_INIT_ACCEPTED) ||
4559                             (num_chunks > 1) ||
4560                             (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) {
4561                                 *offset = length;
4562                                 if (locked_tcb) {
4563                                         SCTP_TCB_UNLOCK(locked_tcb);
4564                                 }
4565                                 return (NULL);
4566                         }
4567                         if ((stcb != NULL) &&
4568                             (SCTP_GET_STATE(&stcb->asoc) ==
4569                             SCTP_STATE_SHUTDOWN_ACK_SENT)) {
4570                                 sctp_send_shutdown_ack(stcb,
4571                                     stcb->asoc.primary_destination);
4572                                 *offset = length;
4573                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4574                                 if (locked_tcb) {
4575                                         SCTP_TCB_UNLOCK(locked_tcb);
4576                                 }
4577                                 return (NULL);
4578                         }
4579                         if (netp) {
4580                                 sctp_handle_init(m, iphlen, *offset, sh,
4581                                     (struct sctp_init_chunk *)ch, inp,
4582                                     stcb, *netp, &abort_no_unlock, vrf_id, port);
4583                         }
4584                         if (abort_no_unlock)
4585                                 return (NULL);
4586
4587                         *offset = length;
4588                         if (locked_tcb) {
4589                                 SCTP_TCB_UNLOCK(locked_tcb);
4590                         }
4591                         return (NULL);
4592                         break;
4593                 case SCTP_PAD_CHUNK:
4594                         break;
4595                 case SCTP_INITIATION_ACK:
4596                         /* must be first and only chunk */
4597                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n");
4598                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4599                                 /* We are not interested anymore */
4600                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4601                                         ;
4602                                 } else {
4603                                         if (locked_tcb != stcb) {
4604                                                 /* Very unlikely */
4605                                                 SCTP_TCB_UNLOCK(locked_tcb);
4606                                         }
4607                                         *offset = length;
4608                                         if (stcb) {
4609 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4610                                                 so = SCTP_INP_SO(inp);
4611                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4612                                                 SCTP_TCB_UNLOCK(stcb);
4613                                                 SCTP_SOCKET_LOCK(so, 1);
4614                                                 SCTP_TCB_LOCK(stcb);
4615                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4616 #endif
4617                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
4618 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4619                                                 SCTP_SOCKET_UNLOCK(so, 1);
4620 #endif
4621                                         }
4622                                         return (NULL);
4623                                 }
4624                         }
4625                         if ((num_chunks > 1) ||
4626                             (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) {
4627                                 *offset = length;
4628                                 if (locked_tcb) {
4629                                         SCTP_TCB_UNLOCK(locked_tcb);
4630                                 }
4631                                 return (NULL);
4632                         }
4633                         if ((netp) && (*netp)) {
4634                                 ret = sctp_handle_init_ack(m, iphlen, *offset, sh,
4635                                     (struct sctp_init_ack_chunk *)ch, stcb, *netp, &abort_no_unlock, vrf_id);
4636                         } else {
4637                                 ret = -1;
4638                         }
4639                         /*
4640                          * Special case, I must call the output routine to
4641                          * get the cookie echoed
4642                          */
4643                         if (abort_no_unlock)
4644                                 return (NULL);
4645
4646                         if ((stcb) && ret == 0)
4647                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4648                         *offset = length;
4649                         if (locked_tcb) {
4650                                 SCTP_TCB_UNLOCK(locked_tcb);
4651                         }
4652                         return (NULL);
4653                         break;
4654                 case SCTP_SELECTIVE_ACK:
4655                         {
4656                                 struct sctp_sack_chunk *sack;
4657                                 int abort_now = 0;
4658                                 uint32_t a_rwnd, cum_ack;
4659                                 uint16_t num_seg, num_dup;
4660                                 uint8_t flags;
4661                                 int offset_seg, offset_dup;
4662
4663                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n");
4664                                 SCTP_STAT_INCR(sctps_recvsacks);
4665                                 if (stcb == NULL) {
4666                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n");
4667                                         break;
4668                                 }
4669                                 if (chk_length < sizeof(struct sctp_sack_chunk)) {
4670                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4671                                         break;
4672                                 }
4673                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4674                                         /*-
4675                                          * If we have sent a shutdown-ack, we will pay no
4676                                          * attention to a sack sent in to us since
4677                                          * we don't care anymore.
4678                                          */
4679                                         break;
4680                                 }
4681                                 sack = (struct sctp_sack_chunk *)ch;
4682                                 flags = ch->chunk_flags;
4683                                 cum_ack = ntohl(sack->sack.cum_tsn_ack);
4684                                 num_seg = ntohs(sack->sack.num_gap_ack_blks);
4685                                 num_dup = ntohs(sack->sack.num_dup_tsns);
4686                                 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd);
4687                                 if (sizeof(struct sctp_sack_chunk) +
4688                                     num_seg * sizeof(struct sctp_gap_ack_block) +
4689                                     num_dup * sizeof(uint32_t) != chk_length) {
4690                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4691                                         break;
4692                                 }
4693                                 offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4694                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4695                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4696                                     cum_ack, num_seg, a_rwnd);
4697                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4698                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4699                                     (num_seg == 0) &&
4700                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4701                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4702                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4703                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))
4704                                     ) {
4705                                         /*
4706                                          * We have a SIMPLE sack having no
4707                                          * prior segments and data on sent
4708                                          * queue to be acked.. Use the
4709                                          * faster path sack processing. We
4710                                          * also allow window update sacks
4711                                          * with no missing segments to go
4712                                          * this way too.
4713                                          */
4714                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen);
4715                                 } else {
4716                                         if (netp && *netp)
4717                                                 sctp_handle_sack(m, offset_seg, offset_dup,
4718                                                     stcb, *netp,
4719                                                     num_seg, 0, num_dup, &abort_now, flags,
4720                                                     cum_ack, a_rwnd, ecne_seen);
4721                                 }
4722                                 if (abort_now) {
4723                                         /* ABORT signal from sack processing */
4724                                         *offset = length;
4725                                         return (NULL);
4726                                 }
4727                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4728                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4729                                     (stcb->asoc.stream_queue_cnt == 0)) {
4730                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4731                                 }
4732                         }
4733                         break;
4734                         /*
4735                          * EY - nr_sack:  If the received chunk is an
4736                          * nr_sack chunk
4737                          */
4738                 case SCTP_NR_SELECTIVE_ACK:
4739                         {
4740                                 struct sctp_nr_sack_chunk *nr_sack;
4741                                 int abort_now = 0;
4742                                 uint32_t a_rwnd, cum_ack;
4743                                 uint16_t num_seg, num_nr_seg, num_dup;
4744                                 uint8_t flags;
4745                                 int offset_seg, offset_dup;
4746
4747                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n");
4748                                 SCTP_STAT_INCR(sctps_recvsacks);
4749                                 if (stcb == NULL) {
4750                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n");
4751                                         break;
4752                                 }
4753                                 if ((stcb->asoc.sctp_nr_sack_on_off == 0) ||
4754                                     (stcb->asoc.peer_supports_nr_sack == 0)) {
4755                                         goto unknown_chunk;
4756                                 }
4757                                 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
4758                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n");
4759                                         break;
4760                                 }
4761                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4762                                         /*-
4763                                          * If we have sent a shutdown-ack, we will pay no
4764                                          * attention to a sack sent in to us since
4765                                          * we don't care anymore.
4766                                          */
4767                                         break;
4768                                 }
4769                                 nr_sack = (struct sctp_nr_sack_chunk *)ch;
4770                                 flags = ch->chunk_flags;
4771                                 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
4772                                 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
4773                                 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
4774                                 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
4775                                 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd);
4776                                 if (sizeof(struct sctp_nr_sack_chunk) +
4777                                     (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
4778                                     num_dup * sizeof(uint32_t) != chk_length) {
4779                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
4780                                         break;
4781                                 }
4782                                 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
4783                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4784                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4785                                     cum_ack, num_seg, a_rwnd);
4786                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4787                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4788                                     (num_seg == 0) && (num_nr_seg == 0) &&
4789                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4790                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4791                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4792                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
4793                                         /*
4794                                          * We have a SIMPLE sack having no
4795                                          * prior segments and data on sent
4796                                          * queue to be acked. Use the faster
4797                                          * path sack processing. We also
4798                                          * allow window update sacks with no
4799                                          * missing segments to go this way
4800                                          * too.
4801                                          */
4802                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
4803                                             &abort_now, ecne_seen);
4804                                 } else {
4805                                         if (netp && *netp)
4806                                                 sctp_handle_sack(m, offset_seg, offset_dup,
4807                                                     stcb, *netp,
4808                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
4809                                                     cum_ack, a_rwnd, ecne_seen);
4810                                 }
4811                                 if (abort_now) {
4812                                         /* ABORT signal from sack processing */
4813                                         *offset = length;
4814                                         return (NULL);
4815                                 }
4816                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4817                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4818                                     (stcb->asoc.stream_queue_cnt == 0)) {
4819                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4820                                 }
4821                         }
4822                         break;
4823
4824                 case SCTP_HEARTBEAT_REQUEST:
4825                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
4826                         if ((stcb) && netp && *netp) {
4827                                 SCTP_STAT_INCR(sctps_recvheartbeat);
4828                                 sctp_send_heartbeat_ack(stcb, m, *offset,
4829                                     chk_length, *netp);
4830
4831                                 /* He's alive so give him credit */
4832                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4833                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4834                                             stcb->asoc.overall_error_count,
4835                                             0,
4836                                             SCTP_FROM_SCTP_INPUT,
4837                                             __LINE__);
4838                                 }
4839                                 stcb->asoc.overall_error_count = 0;
4840                         }
4841                         break;
4842                 case SCTP_HEARTBEAT_ACK:
4843                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n");
4844                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
4845                                 /* Its not ours */
4846                                 *offset = length;
4847                                 if (locked_tcb) {
4848                                         SCTP_TCB_UNLOCK(locked_tcb);
4849                                 }
4850                                 return (NULL);
4851                         }
4852                         /* He's alive so give him credit */
4853                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4854                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4855                                     stcb->asoc.overall_error_count,
4856                                     0,
4857                                     SCTP_FROM_SCTP_INPUT,
4858                                     __LINE__);
4859                         }
4860                         stcb->asoc.overall_error_count = 0;
4861                         SCTP_STAT_INCR(sctps_recvheartbeatack);
4862                         if (netp && *netp)
4863                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
4864                                     stcb, *netp);
4865                         break;
4866                 case SCTP_ABORT_ASSOCIATION:
4867                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
4868                             stcb);
4869                         if ((stcb) && netp && *netp)
4870                                 sctp_handle_abort((struct sctp_abort_chunk *)ch,
4871                                     stcb, *netp);
4872                         *offset = length;
4873                         return (NULL);
4874                         break;
4875                 case SCTP_SHUTDOWN:
4876                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
4877                             stcb);
4878                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
4879                                 *offset = length;
4880                                 if (locked_tcb) {
4881                                         SCTP_TCB_UNLOCK(locked_tcb);
4882                                 }
4883                                 return (NULL);
4884                         }
4885                         if (netp && *netp) {
4886                                 int abort_flag = 0;
4887
4888                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
4889                                     stcb, *netp, &abort_flag);
4890                                 if (abort_flag) {
4891                                         *offset = length;
4892                                         return (NULL);
4893                                 }
4894                         }
4895                         break;
4896                 case SCTP_SHUTDOWN_ACK:
4897                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", stcb);
4898                         if ((stcb) && (netp) && (*netp))
4899                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
4900                         *offset = length;
4901                         return (NULL);
4902                         break;
4903
4904                 case SCTP_OPERATION_ERROR:
4905                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n");
4906                         if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) {
4907
4908                                 *offset = length;
4909                                 return (NULL);
4910                         }
4911                         break;
4912                 case SCTP_COOKIE_ECHO:
4913                         SCTPDBG(SCTP_DEBUG_INPUT3,
4914                             "SCTP_COOKIE-ECHO, stcb %p\n", stcb);
4915                         if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4916                                 ;
4917                         } else {
4918                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4919                                         /* We are not interested anymore */
4920                         abend:
4921                                         if (stcb) {
4922                                                 SCTP_TCB_UNLOCK(stcb);
4923                                         }
4924                                         *offset = length;
4925                                         return (NULL);
4926                                 }
4927                         }
4928                         /*
4929                          * First are we accepting? We do this again here
4930                          * since it is possible that a previous endpoint WAS
4931                          * listening responded to a INIT-ACK and then
4932                          * closed. We opened and bound.. and are now no
4933                          * longer listening.
4934                          */
4935
4936                         if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) {
4937                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
4938                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
4939                                         struct mbuf *oper;
4940                                         struct sctp_paramhdr *phdr;
4941
4942                                         oper = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
4943                                             0, M_DONTWAIT, 1, MT_DATA);
4944                                         if (oper) {
4945                                                 SCTP_BUF_LEN(oper) =
4946                                                     sizeof(struct sctp_paramhdr);
4947                                                 phdr = mtod(oper,
4948                                                     struct sctp_paramhdr *);
4949                                                 phdr->param_type =
4950                                                     htons(SCTP_CAUSE_OUT_OF_RESC);
4951                                                 phdr->param_length =
4952                                                     htons(sizeof(struct sctp_paramhdr));
4953                                         }
4954                                         sctp_abort_association(inp, stcb, m,
4955                                             iphlen, sh, oper, vrf_id, port);
4956                                 }
4957                                 *offset = length;
4958                                 return (NULL);
4959                         } else {
4960                                 struct mbuf *ret_buf;
4961                                 struct sctp_inpcb *linp;
4962
4963                                 if (stcb) {
4964                                         linp = NULL;
4965                                 } else {
4966                                         linp = inp;
4967                                 }
4968
4969                                 if (linp) {
4970                                         SCTP_ASOC_CREATE_LOCK(linp);
4971                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
4972                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
4973                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
4974                                                 goto abend;
4975                                         }
4976                                 }
4977                                 if (netp) {
4978                                         ret_buf =
4979                                             sctp_handle_cookie_echo(m, iphlen,
4980                                             *offset, sh,
4981                                             (struct sctp_cookie_echo_chunk *)ch,
4982                                             &inp, &stcb, netp,
4983                                             auth_skipped,
4984                                             auth_offset,
4985                                             auth_len,
4986                                             &locked_tcb,
4987                                             vrf_id,
4988                                             port);
4989                                 } else {
4990                                         ret_buf = NULL;
4991                                 }
4992                                 if (linp) {
4993                                         SCTP_ASOC_CREATE_UNLOCK(linp);
4994                                 }
4995                                 if (ret_buf == NULL) {
4996                                         if (locked_tcb) {
4997                                                 SCTP_TCB_UNLOCK(locked_tcb);
4998                                         }
4999                                         SCTPDBG(SCTP_DEBUG_INPUT3,
5000                                             "GAK, null buffer\n");
5001                                         auth_skipped = 0;
5002                                         *offset = length;
5003                                         return (NULL);
5004                                 }
5005                                 /* if AUTH skipped, see if it verified... */
5006                                 if (auth_skipped) {
5007                                         got_auth = 1;
5008                                         auth_skipped = 0;
5009                                 }
5010                                 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
5011                                         /*
5012                                          * Restart the timer if we have
5013                                          * pending data
5014                                          */
5015                                         struct sctp_tmit_chunk *chk;
5016
5017                                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
5018                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
5019                                 }
5020                         }
5021                         break;
5022                 case SCTP_COOKIE_ACK:
5023                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", stcb);
5024                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5025                                 if (locked_tcb) {
5026                                         SCTP_TCB_UNLOCK(locked_tcb);
5027                                 }
5028                                 return (NULL);
5029                         }
5030                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5031                                 /* We are not interested anymore */
5032                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5033                                         ;
5034                                 } else if (stcb) {
5035 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5036                                         so = SCTP_INP_SO(inp);
5037                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5038                                         SCTP_TCB_UNLOCK(stcb);
5039                                         SCTP_SOCKET_LOCK(so, 1);
5040                                         SCTP_TCB_LOCK(stcb);
5041                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5042 #endif
5043                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
5044 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5045                                         SCTP_SOCKET_UNLOCK(so, 1);
5046 #endif
5047                                         *offset = length;
5048                                         return (NULL);
5049                                 }
5050                         }
5051                         /* He's alive so give him credit */
5052                         if ((stcb) && netp && *netp) {
5053                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5054                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5055                                             stcb->asoc.overall_error_count,
5056                                             0,
5057                                             SCTP_FROM_SCTP_INPUT,
5058                                             __LINE__);
5059                                 }
5060                                 stcb->asoc.overall_error_count = 0;
5061                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
5062                         }
5063                         break;
5064                 case SCTP_ECN_ECHO:
5065                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n");
5066                         /* He's alive so give him credit */
5067                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5068                                 /* Its not ours */
5069                                 if (locked_tcb) {
5070                                         SCTP_TCB_UNLOCK(locked_tcb);
5071                                 }
5072                                 *offset = length;
5073                                 return (NULL);
5074                         }
5075                         if (stcb) {
5076                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5077                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5078                                             stcb->asoc.overall_error_count,
5079                                             0,
5080                                             SCTP_FROM_SCTP_INPUT,
5081                                             __LINE__);
5082                                 }
5083                                 stcb->asoc.overall_error_count = 0;
5084                                 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch,
5085                                     stcb);
5086                                 ecne_seen = 1;
5087                         }
5088                         break;
5089                 case SCTP_ECN_CWR:
5090                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n");
5091                         /* He's alive so give him credit */
5092                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5093                                 /* Its not ours */
5094                                 if (locked_tcb) {
5095                                         SCTP_TCB_UNLOCK(locked_tcb);
5096                                 }
5097                                 *offset = length;
5098                                 return (NULL);
5099                         }
5100                         if (stcb) {
5101                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5102                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5103                                             stcb->asoc.overall_error_count,
5104                                             0,
5105                                             SCTP_FROM_SCTP_INPUT,
5106                                             __LINE__);
5107                                 }
5108                                 stcb->asoc.overall_error_count = 0;
5109                                 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5110                         }
5111                         break;
5112                 case SCTP_SHUTDOWN_COMPLETE:
5113                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", stcb);
5114                         /* must be first and only chunk */
5115                         if ((num_chunks > 1) ||
5116                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5117                                 *offset = length;
5118                                 if (locked_tcb) {
5119                                         SCTP_TCB_UNLOCK(locked_tcb);
5120                                 }
5121                                 return (NULL);
5122                         }
5123                         if ((stcb) && netp && *netp) {
5124                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5125                                     stcb, *netp);
5126                         }
5127                         *offset = length;
5128                         return (NULL);
5129                         break;
5130                 case SCTP_ASCONF:
5131                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5132                         /* He's alive so give him credit */
5133                         if (stcb) {
5134                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5135                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5136                                             stcb->asoc.overall_error_count,
5137                                             0,
5138                                             SCTP_FROM_SCTP_INPUT,
5139                                             __LINE__);
5140                                 }
5141                                 stcb->asoc.overall_error_count = 0;
5142                                 sctp_handle_asconf(m, *offset,
5143                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5144                                 asconf_cnt++;
5145                         }
5146                         break;
5147                 case SCTP_ASCONF_ACK:
5148                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n");
5149                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5150                                 /* Its not ours */
5151                                 if (locked_tcb) {
5152                                         SCTP_TCB_UNLOCK(locked_tcb);
5153                                 }
5154                                 *offset = length;
5155                                 return (NULL);
5156                         }
5157                         if ((stcb) && netp && *netp) {
5158                                 /* He's alive so give him credit */
5159                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5160                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5161                                             stcb->asoc.overall_error_count,
5162                                             0,
5163                                             SCTP_FROM_SCTP_INPUT,
5164                                             __LINE__);
5165                                 }
5166                                 stcb->asoc.overall_error_count = 0;
5167                                 sctp_handle_asconf_ack(m, *offset,
5168                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5169                                 if (abort_no_unlock)
5170                                         return (NULL);
5171                         }
5172                         break;
5173                 case SCTP_FORWARD_CUM_TSN:
5174                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n");
5175                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5176                                 /* Its not ours */
5177                                 if (locked_tcb) {
5178                                         SCTP_TCB_UNLOCK(locked_tcb);
5179                                 }
5180                                 *offset = length;
5181                                 return (NULL);
5182                         }
5183                         /* He's alive so give him credit */
5184                         if (stcb) {
5185                                 int abort_flag = 0;
5186
5187                                 stcb->asoc.overall_error_count = 0;
5188                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5189                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5190                                             stcb->asoc.overall_error_count,
5191                                             0,
5192                                             SCTP_FROM_SCTP_INPUT,
5193                                             __LINE__);
5194                                 }
5195                                 *fwd_tsn_seen = 1;
5196                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5197                                         /* We are not interested anymore */
5198 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5199                                         so = SCTP_INP_SO(inp);
5200                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5201                                         SCTP_TCB_UNLOCK(stcb);
5202                                         SCTP_SOCKET_LOCK(so, 1);
5203                                         SCTP_TCB_LOCK(stcb);
5204                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5205 #endif
5206                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
5207 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5208                                         SCTP_SOCKET_UNLOCK(so, 1);
5209 #endif
5210                                         *offset = length;
5211                                         return (NULL);
5212                                 }
5213                                 sctp_handle_forward_tsn(stcb,
5214                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5215                                 if (abort_flag) {
5216                                         *offset = length;
5217                                         return (NULL);
5218                                 } else {
5219                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5220                                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5221                                                     stcb->asoc.overall_error_count,
5222                                                     0,
5223                                                     SCTP_FROM_SCTP_INPUT,
5224                                                     __LINE__);
5225                                         }
5226                                         stcb->asoc.overall_error_count = 0;
5227                                 }
5228
5229                         }
5230                         break;
5231                 case SCTP_STREAM_RESET:
5232                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5233                         if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
5234                                 /* Its not ours */
5235                                 if (locked_tcb) {
5236                                         SCTP_TCB_UNLOCK(locked_tcb);
5237                                 }
5238                                 *offset = length;
5239                                 return (NULL);
5240                         }
5241                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5242                                 /* We are not interested anymore */
5243 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5244                                 so = SCTP_INP_SO(inp);
5245                                 atomic_add_int(&stcb->asoc.refcnt, 1);
5246                                 SCTP_TCB_UNLOCK(stcb);
5247                                 SCTP_SOCKET_LOCK(so, 1);
5248                                 SCTP_TCB_LOCK(stcb);
5249                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
5250 #endif
5251                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
5252 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5253                                 SCTP_SOCKET_UNLOCK(so, 1);
5254 #endif
5255                                 *offset = length;
5256                                 return (NULL);
5257                         }
5258                         if (stcb->asoc.peer_supports_strreset == 0) {
5259                                 /*
5260                                  * hmm, peer should have announced this, but
5261                                  * we will turn it on since he is sending us
5262                                  * a stream reset.
5263                                  */
5264                                 stcb->asoc.peer_supports_strreset = 1;
5265                         }
5266                         if (sctp_handle_stream_reset(stcb, m, *offset, (struct sctp_stream_reset_out_req *)ch)) {
5267                                 /* stop processing */
5268                                 *offset = length;
5269                                 return (NULL);
5270                         }
5271                         break;
5272                 case SCTP_PACKET_DROPPED:
5273                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5274                         /* re-get it all please */
5275                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5276                                 /* Its not ours */
5277                                 if (locked_tcb) {
5278                                         SCTP_TCB_UNLOCK(locked_tcb);
5279                                 }
5280                                 *offset = length;
5281                                 return (NULL);
5282                         }
5283                         if (ch && (stcb) && netp && (*netp)) {
5284                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5285                                     stcb, *netp,
5286                                     min(chk_length, (sizeof(chunk_buf) - 4)));
5287
5288                         }
5289                         break;
5290
5291                 case SCTP_AUTHENTICATION:
5292                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5293                         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
5294                                 goto unknown_chunk;
5295
5296                         if (stcb == NULL) {
5297                                 /* save the first AUTH for later processing */
5298                                 if (auth_skipped == 0) {
5299                                         auth_offset = *offset;
5300                                         auth_len = chk_length;
5301                                         auth_skipped = 1;
5302                                 }
5303                                 /* skip this chunk (temporarily) */
5304                                 goto next_chunk;
5305                         }
5306                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5307                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5308                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5309                                 /* Its not ours */
5310                                 if (locked_tcb) {
5311                                         SCTP_TCB_UNLOCK(locked_tcb);
5312                                 }
5313                                 *offset = length;
5314                                 return (NULL);
5315                         }
5316                         if (got_auth == 1) {
5317                                 /* skip this chunk... it's already auth'd */
5318                                 goto next_chunk;
5319                         }
5320                         got_auth = 1;
5321                         if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
5322                             m, *offset)) {
5323                                 /* auth HMAC failed so dump the packet */
5324                                 *offset = length;
5325                                 return (stcb);
5326                         } else {
5327                                 /* remaining chunks are HMAC checked */
5328                                 stcb->asoc.authenticated = 1;
5329                         }
5330                         break;
5331
5332                 default:
5333         unknown_chunk:
5334                         /* it's an unknown chunk! */
5335                         if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
5336                                 struct mbuf *mm;
5337                                 struct sctp_paramhdr *phd;
5338
5339                                 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
5340                                     0, M_DONTWAIT, 1, MT_DATA);
5341                                 if (mm) {
5342                                         phd = mtod(mm, struct sctp_paramhdr *);
5343                                         /*
5344                                          * We cheat and use param type since
5345                                          * we did not bother to define a
5346                                          * error cause struct. They are the
5347                                          * same basic format with different
5348                                          * names.
5349                                          */
5350                                         phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5351                                         phd->param_length = htons(chk_length + sizeof(*phd));
5352                                         SCTP_BUF_LEN(mm) = sizeof(*phd);
5353                                         SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, SCTP_SIZE32(chk_length),
5354                                             M_DONTWAIT);
5355                                         if (SCTP_BUF_NEXT(mm)) {
5356 #ifdef SCTP_MBUF_LOGGING
5357                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5358                                                         struct mbuf *mat;
5359
5360                                                         mat = SCTP_BUF_NEXT(mm);
5361                                                         while (mat) {
5362                                                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
5363                                                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
5364                                                                 }
5365                                                                 mat = SCTP_BUF_NEXT(mat);
5366                                                         }
5367                                                 }
5368 #endif
5369                                                 sctp_queue_op_err(stcb, mm);
5370                                         } else {
5371                                                 sctp_m_freem(mm);
5372                                         }
5373                                 }
5374                         }
5375                         if ((ch->chunk_type & 0x80) == 0) {
5376                                 /* discard this packet */
5377                                 *offset = length;
5378                                 return (stcb);
5379                         }       /* else skip this bad chunk and continue... */
5380                         break;
5381                 }               /* switch (ch->chunk_type) */
5382
5383
5384 next_chunk:
5385                 /* get the next chunk */
5386                 *offset += SCTP_SIZE32(chk_length);
5387                 if (*offset >= length) {
5388                         /* no more data left in the mbuf chain */
5389                         break;
5390                 }
5391                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5392                     sizeof(struct sctp_chunkhdr), chunk_buf);
5393                 if (ch == NULL) {
5394                         if (locked_tcb) {
5395                                 SCTP_TCB_UNLOCK(locked_tcb);
5396                         }
5397                         *offset = length;
5398                         return (NULL);
5399                 }
5400         }                       /* while */
5401
5402         if (asconf_cnt > 0 && stcb != NULL) {
5403                 sctp_send_asconf_ack(stcb);
5404         }
5405         return (stcb);
5406 }
5407
5408
5409 #ifdef INVARIANTS
5410 #ifdef __GNUC__
5411 __attribute__((noinline))
5412 #endif
5413         void
5414              sctp_validate_no_locks(struct sctp_inpcb *inp)
5415 {
5416         struct sctp_tcb *lstcb;
5417
5418         LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) {
5419                 if (mtx_owned(&lstcb->tcb_mtx)) {
5420                         panic("Own lock on stcb at return from input");
5421                 }
5422         }
5423         if (mtx_owned(&inp->inp_create_mtx)) {
5424                 panic("Own create lock on inp");
5425         }
5426         if (mtx_owned(&inp->inp_mtx)) {
5427                 panic("Own inp lock on inp");
5428         }
5429 }
5430
5431 #endif
5432
5433 /*
5434  * common input chunk processing (v4 and v6)
5435  */
5436 void
5437 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset,
5438     int length, struct sctphdr *sh, struct sctp_chunkhdr *ch,
5439     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net,
5440     uint8_t ecn_bits, uint32_t vrf_id, uint16_t port)
5441 {
5442         /*
5443          * Control chunk processing
5444          */
5445         uint32_t high_tsn;
5446         int fwd_tsn_seen = 0, data_processed = 0;
5447         struct mbuf *m = *mm;
5448         int abort_flag = 0;
5449         int un_sent;
5450         int cnt_ctrl_ready = 0;
5451
5452         SCTP_STAT_INCR(sctps_recvdatagrams);
5453 #ifdef SCTP_AUDITING_ENABLED
5454         sctp_audit_log(0xE0, 1);
5455         sctp_auditing(0, inp, stcb, net);
5456 #endif
5457
5458         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5459             m, iphlen, offset, length, stcb);
5460         if (stcb) {
5461                 /* always clear this before beginning a packet */
5462                 stcb->asoc.authenticated = 0;
5463                 stcb->asoc.seen_a_sack_this_pkt = 0;
5464                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5465                     stcb, stcb->asoc.state);
5466
5467                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5468                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5469                         /*-
5470                          * If we hit here, we had a ref count
5471                          * up when the assoc was aborted and the
5472                          * timer is clearing out the assoc, we should
5473                          * NOT respond to any packet.. its OOTB.
5474                          */
5475                         SCTP_TCB_UNLOCK(stcb);
5476                         sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL,
5477                             vrf_id, port);
5478                         goto out_now;
5479                 }
5480         }
5481         if (IS_SCTP_CONTROL(ch)) {
5482                 /* process the control portion of the SCTP packet */
5483                 /* sa_ignore NO_NULL_CHK */
5484                 stcb = sctp_process_control(m, iphlen, &offset, length, sh, ch,
5485                     inp, stcb, &net, &fwd_tsn_seen, vrf_id, port);
5486                 if (stcb) {
5487                         /*
5488                          * This covers us if the cookie-echo was there and
5489                          * it changes our INP.
5490                          */
5491                         inp = stcb->sctp_ep;
5492                         if ((net) && (port)) {
5493                                 if (net->port == 0) {
5494                                         sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr));
5495                                 }
5496                                 net->port = port;
5497                         }
5498                 }
5499         } else {
5500                 /*
5501                  * no control chunks, so pre-process DATA chunks (these
5502                  * checks are taken care of by control processing)
5503                  */
5504
5505                 /*
5506                  * if DATA only packet, and auth is required, then punt...
5507                  * can't have authenticated without any AUTH (control)
5508                  * chunks
5509                  */
5510                 if ((stcb != NULL) &&
5511                     !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
5512                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5513                         /* "silently" ignore */
5514                         SCTP_STAT_INCR(sctps_recvauthmissing);
5515                         SCTP_TCB_UNLOCK(stcb);
5516                         goto out_now;
5517                 }
5518                 if (stcb == NULL) {
5519                         /* out of the blue DATA chunk */
5520                         sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL,
5521                             vrf_id, port);
5522                         goto out_now;
5523                 }
5524                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5525                         /* v_tag mismatch! */
5526                         SCTP_STAT_INCR(sctps_badvtag);
5527                         SCTP_TCB_UNLOCK(stcb);
5528                         goto out_now;
5529                 }
5530         }
5531
5532         if (stcb == NULL) {
5533                 /*
5534                  * no valid TCB for this packet, or we found it's a bad
5535                  * packet while processing control, or we're done with this
5536                  * packet (done or skip rest of data), so we drop it...
5537                  */
5538                 goto out_now;
5539         }
5540         /*
5541          * DATA chunk processing
5542          */
5543         /* plow through the data chunks while length > offset */
5544
5545         /*
5546          * Rest should be DATA only.  Check authentication state if AUTH for
5547          * DATA is required.
5548          */
5549         if ((length > offset) &&
5550             (stcb != NULL) &&
5551             !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
5552             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5553             !stcb->asoc.authenticated) {
5554                 /* "silently" ignore */
5555                 SCTP_STAT_INCR(sctps_recvauthmissing);
5556                 SCTPDBG(SCTP_DEBUG_AUTH1,
5557                     "Data chunk requires AUTH, skipped\n");
5558                 goto trigger_send;
5559         }
5560         if (length > offset) {
5561                 int retval;
5562
5563                 /*
5564                  * First check to make sure our state is correct. We would
5565                  * not get here unless we really did have a tag, so we don't
5566                  * abort if this happens, just dump the chunk silently.
5567                  */
5568                 switch (SCTP_GET_STATE(&stcb->asoc)) {
5569                 case SCTP_STATE_COOKIE_ECHOED:
5570                         /*
5571                          * we consider data with valid tags in this state
5572                          * shows us the cookie-ack was lost. Imply it was
5573                          * there.
5574                          */
5575                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5576                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5577                                     stcb->asoc.overall_error_count,
5578                                     0,
5579                                     SCTP_FROM_SCTP_INPUT,
5580                                     __LINE__);
5581                         }
5582                         stcb->asoc.overall_error_count = 0;
5583                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5584                         break;
5585                 case SCTP_STATE_COOKIE_WAIT:
5586                         /*
5587                          * We consider OOTB any data sent during asoc setup.
5588                          */
5589                         sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL,
5590                             vrf_id, port);
5591                         SCTP_TCB_UNLOCK(stcb);
5592                         goto out_now;
5593                         /* sa_ignore NOTREACHED */
5594                         break;
5595                 case SCTP_STATE_EMPTY:  /* should not happen */
5596                 case SCTP_STATE_INUSE:  /* should not happen */
5597                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5598                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5599                 default:
5600                         SCTP_TCB_UNLOCK(stcb);
5601                         goto out_now;
5602                         /* sa_ignore NOTREACHED */
5603                         break;
5604                 case SCTP_STATE_OPEN:
5605                 case SCTP_STATE_SHUTDOWN_SENT:
5606                         break;
5607                 }
5608                 /* plow through the data chunks while length > offset */
5609                 retval = sctp_process_data(mm, iphlen, &offset, length, sh,
5610                     inp, stcb, net, &high_tsn);
5611                 if (retval == 2) {
5612                         /*
5613                          * The association aborted, NO UNLOCK needed since
5614                          * the association is destroyed.
5615                          */
5616                         goto out_now;
5617                 }
5618                 data_processed = 1;
5619                 /*
5620                  * Anything important needs to have been m_copy'ed in
5621                  * process_data
5622                  */
5623         }
5624         /* take care of ecn */
5625         if ((stcb->asoc.ecn_allowed == 1) &&
5626             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5627                 /* Yep, we need to add a ECNE */
5628                 sctp_send_ecn_echo(stcb, net, high_tsn);
5629         }
5630         if ((data_processed == 0) && (fwd_tsn_seen)) {
5631                 int was_a_gap;
5632                 uint32_t highest_tsn;
5633
5634                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
5635                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
5636                 } else {
5637                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
5638                 }
5639                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
5640                 stcb->asoc.send_sack = 1;
5641                 sctp_sack_check(stcb, was_a_gap, &abort_flag);
5642                 if (abort_flag) {
5643                         /* Again, we aborted so NO UNLOCK needed */
5644                         goto out_now;
5645                 }
5646         } else if (fwd_tsn_seen) {
5647                 stcb->asoc.send_sack = 1;
5648         }
5649         /* trigger send of any chunks in queue... */
5650 trigger_send:
5651 #ifdef SCTP_AUDITING_ENABLED
5652         sctp_audit_log(0xE0, 2);
5653         sctp_auditing(1, inp, stcb, net);
5654 #endif
5655         SCTPDBG(SCTP_DEBUG_INPUT1,
5656             "Check for chunk output prw:%d tqe:%d tf=%d\n",
5657             stcb->asoc.peers_rwnd,
5658             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
5659             stcb->asoc.total_flight);
5660         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
5661         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
5662                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
5663         }
5664         if (cnt_ctrl_ready ||
5665             ((un_sent) &&
5666             (stcb->asoc.peers_rwnd > 0 ||
5667             (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
5668                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
5669                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5670                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
5671         }
5672 #ifdef SCTP_AUDITING_ENABLED
5673         sctp_audit_log(0xE0, 3);
5674         sctp_auditing(2, inp, stcb, net);
5675 #endif
5676         SCTP_TCB_UNLOCK(stcb);
5677 out_now:
5678 #ifdef INVARIANTS
5679         sctp_validate_no_locks(inp);
5680 #endif
5681         return;
5682 }
5683
5684 #if 0
5685 static void
5686 sctp_print_mbuf_chain(struct mbuf *m)
5687 {
5688         for (; m; m = SCTP_BUF_NEXT(m)) {
5689                 printf("%p: m_len = %ld\n", m, SCTP_BUF_LEN(m));
5690                 if (SCTP_BUF_IS_EXTENDED(m))
5691                         printf("%p: extend_size = %d\n", m, SCTP_BUF_EXTEND_SIZE(m));
5692         }
5693 }
5694
5695 #endif
5696
5697 void
5698 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
5699 {
5700 #ifdef SCTP_MBUF_LOGGING
5701         struct mbuf *mat;
5702
5703 #endif
5704         struct mbuf *m;
5705         int iphlen;
5706         uint32_t vrf_id = 0;
5707         uint8_t ecn_bits;
5708         struct ip *ip;
5709         struct sctphdr *sh;
5710         struct sctp_inpcb *inp = NULL;
5711         struct sctp_nets *net;
5712         struct sctp_tcb *stcb = NULL;
5713         struct sctp_chunkhdr *ch;
5714         int refcount_up = 0;
5715         int length, mlen, offset;
5716
5717 #if !defined(SCTP_WITH_NO_CSUM)
5718         uint32_t check, calc_check;
5719
5720 #endif
5721
5722         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
5723                 SCTP_RELEASE_PKT(i_pak);
5724                 return;
5725         }
5726         mlen = SCTP_HEADER_LEN(i_pak);
5727         iphlen = off;
5728         m = SCTP_HEADER_TO_CHAIN(i_pak);
5729
5730         net = NULL;
5731         SCTP_STAT_INCR(sctps_recvpackets);
5732         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
5733
5734
5735 #ifdef SCTP_MBUF_LOGGING
5736         /* Log in any input mbufs */
5737         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5738                 mat = m;
5739                 while (mat) {
5740                         if (SCTP_BUF_IS_EXTENDED(mat)) {
5741                                 sctp_log_mb(mat, SCTP_MBUF_INPUT);
5742                         }
5743                         mat = SCTP_BUF_NEXT(mat);
5744                 }
5745         }
5746 #endif
5747 #ifdef  SCTP_PACKET_LOGGING
5748         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
5749                 sctp_packet_log(m, mlen);
5750 #endif
5751         /*
5752          * Must take out the iphlen, since mlen expects this (only effect lb
5753          * case)
5754          */
5755         mlen -= iphlen;
5756
5757         /*
5758          * Get IP, SCTP, and first chunk header together in first mbuf.
5759          */
5760         ip = mtod(m, struct ip *);
5761         offset = iphlen + sizeof(*sh) + sizeof(*ch);
5762         if (SCTP_BUF_LEN(m) < offset) {
5763                 if ((m = m_pullup(m, offset)) == 0) {
5764                         SCTP_STAT_INCR(sctps_hdrops);
5765                         return;
5766                 }
5767                 ip = mtod(m, struct ip *);
5768         }
5769         /* validate mbuf chain length with IP payload length */
5770         if (mlen < (SCTP_GET_IPV4_LENGTH(ip) - iphlen)) {
5771                 SCTP_STAT_INCR(sctps_hdrops);
5772                 goto bad;
5773         }
5774         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
5775         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(*sh));
5776         SCTPDBG(SCTP_DEBUG_INPUT1,
5777             "sctp_input() length:%d iphlen:%d\n", mlen, iphlen);
5778
5779         /* SCTP does not allow broadcasts or multicasts */
5780         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
5781                 goto bad;
5782         }
5783         if (SCTP_IS_IT_BROADCAST(ip->ip_dst, m)) {
5784                 /*
5785                  * We only look at broadcast if its a front state, All
5786                  * others we will not have a tcb for anyway.
5787                  */
5788                 goto bad;
5789         }
5790         /* validate SCTP checksum */
5791         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
5792             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n",
5793             m->m_pkthdr.len,
5794             if_name(m->m_pkthdr.rcvif),
5795             m->m_pkthdr.csum_flags);
5796 #if defined(SCTP_WITH_NO_CSUM)
5797         SCTP_STAT_INCR(sctps_recvnocrc);
5798 #else
5799         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
5800                 SCTP_STAT_INCR(sctps_recvhwcrc);
5801                 goto sctp_skip_csum_4;
5802         }
5803         check = sh->checksum;   /* save incoming checksum */
5804         sh->checksum = 0;       /* prepare for calc */
5805         calc_check = sctp_calculate_cksum(m, iphlen);
5806         sh->checksum = check;
5807         SCTP_STAT_INCR(sctps_recvswcrc);
5808         if (calc_check != check) {
5809                 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5810                     calc_check, check, m, mlen, iphlen);
5811
5812                 stcb = sctp_findassociation_addr(m, iphlen,
5813                     offset - sizeof(*ch),
5814                     sh, ch, &inp, &net,
5815                     vrf_id);
5816                 if ((net) && (port)) {
5817                         if (net->port == 0) {
5818                                 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr));
5819                         }
5820                         net->port = port;
5821                 }
5822                 if ((net != NULL) && (m->m_flags & M_FLOWID)) {
5823                         net->flowid = m->m_pkthdr.flowid;
5824 #ifdef INVARIANTS
5825                         net->flowidset = 1;
5826 #endif
5827                 }
5828                 if ((inp) && (stcb)) {
5829                         sctp_send_packet_dropped(stcb, net, m, iphlen, 1);
5830                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5831                 } else if ((inp != NULL) && (stcb == NULL)) {
5832                         refcount_up = 1;
5833                 }
5834                 SCTP_STAT_INCR(sctps_badsum);
5835                 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5836                 goto bad;
5837         }
5838 sctp_skip_csum_4:
5839 #endif
5840         /* destination port of 0 is illegal, based on RFC2960. */
5841         if (sh->dest_port == 0) {
5842                 SCTP_STAT_INCR(sctps_hdrops);
5843                 goto bad;
5844         }
5845         /*
5846          * Locate pcb and tcb for datagram sctp_findassociation_addr() wants
5847          * IP/SCTP/first chunk header...
5848          */
5849         stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch),
5850             sh, ch, &inp, &net, vrf_id);
5851         if ((net) && (port)) {
5852                 if (net->port == 0) {
5853                         sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr));
5854                 }
5855                 net->port = port;
5856         }
5857         if ((net != NULL) && (m->m_flags & M_FLOWID)) {
5858                 net->flowid = m->m_pkthdr.flowid;
5859 #ifdef INVARIANTS
5860                 net->flowidset = 1;
5861 #endif
5862         }
5863         /* inp's ref-count increased && stcb locked */
5864         if (inp == NULL) {
5865                 struct sctp_init_chunk *init_chk, chunk_buf;
5866
5867                 SCTP_STAT_INCR(sctps_noport);
5868 #ifdef ICMP_BANDLIM
5869                 /*
5870                  * we use the bandwidth limiting to protect against sending
5871                  * too many ABORTS all at once. In this case these count the
5872                  * same as an ICMP message.
5873                  */
5874                 if (badport_bandlim(0) < 0)
5875                         goto bad;
5876 #endif                          /* ICMP_BANDLIM */
5877                 SCTPDBG(SCTP_DEBUG_INPUT1,
5878                     "Sending a ABORT from packet entry!\n");
5879                 if (ch->chunk_type == SCTP_INITIATION) {
5880                         /*
5881                          * we do a trick here to get the INIT tag, dig in
5882                          * and get the tag from the INIT and put it in the
5883                          * common header.
5884                          */
5885                         init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m,
5886                             iphlen + sizeof(*sh), sizeof(*init_chk),
5887                             (uint8_t *) & chunk_buf);
5888                         if (init_chk != NULL)
5889                                 sh->v_tag = init_chk->init.initiate_tag;
5890                 }
5891                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5892                         sctp_send_shutdown_complete2(m, iphlen, sh, vrf_id, port);
5893                         goto bad;
5894                 }
5895                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5896                         goto bad;
5897                 }
5898                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION)
5899                         sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port);
5900                 goto bad;
5901         } else if (stcb == NULL) {
5902                 refcount_up = 1;
5903         }
5904 #ifdef IPSEC
5905         /*
5906          * I very much doubt any of the IPSEC stuff will work but I have no
5907          * idea, so I will leave it in place.
5908          */
5909         if (inp && ipsec4_in_reject(m, &inp->ip_inp.inp)) {
5910                 MODULE_GLOBAL(ipsec4stat).in_polvio++;
5911                 SCTP_STAT_INCR(sctps_hdrops);
5912                 goto bad;
5913         }
5914 #endif                          /* IPSEC */
5915
5916         /*
5917          * common chunk processing
5918          */
5919         length = ip->ip_len + iphlen;
5920         offset -= sizeof(struct sctp_chunkhdr);
5921
5922         ecn_bits = ip->ip_tos;
5923
5924         /* sa_ignore NO_NULL_CHK */
5925         sctp_common_input_processing(&m, iphlen, offset, length, sh, ch,
5926             inp, stcb, net, ecn_bits, vrf_id, port);
5927         /* inp's ref-count reduced && stcb unlocked */
5928         if (m) {
5929                 sctp_m_freem(m);
5930         }
5931         if ((inp) && (refcount_up)) {
5932                 /* reduce ref-count */
5933                 SCTP_INP_DECR_REF(inp);
5934         }
5935         return;
5936 bad:
5937         if (stcb) {
5938                 SCTP_TCB_UNLOCK(stcb);
5939         }
5940         if ((inp) && (refcount_up)) {
5941                 /* reduce ref-count */
5942                 SCTP_INP_DECR_REF(inp);
5943         }
5944         if (m) {
5945                 sctp_m_freem(m);
5946         }
5947         return;
5948 }
5949
5950 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
5951 extern int *sctp_cpuarry;
5952
5953 #endif
5954
5955 void
5956 sctp_input(struct mbuf *m, int off)
5957 {
5958 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
5959         struct ip *ip;
5960         struct sctphdr *sh;
5961         int offset;
5962         int cpu_to_use;
5963         uint32_t flowid, tag;
5964
5965         if (mp_ncpus > 1) {
5966                 if (m->m_flags & M_FLOWID) {
5967                         flowid = m->m_pkthdr.flowid;
5968                 } else {
5969                         /*
5970                          * No flow id built by lower layers fix it so we
5971                          * create one.
5972                          */
5973                         ip = mtod(m, struct ip *);
5974                         offset = off + sizeof(*sh);
5975                         if (SCTP_BUF_LEN(m) < offset) {
5976                                 if ((m = m_pullup(m, offset)) == 0) {
5977                                         SCTP_STAT_INCR(sctps_hdrops);
5978                                         return;
5979                                 }
5980                                 ip = mtod(m, struct ip *);
5981                         }
5982                         sh = (struct sctphdr *)((caddr_t)ip + off);
5983                         tag = htonl(sh->v_tag);
5984                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
5985                         m->m_pkthdr.flowid = flowid;
5986                         m->m_flags |= M_FLOWID;
5987                 }
5988                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
5989                 sctp_queue_to_mcore(m, off, cpu_to_use);
5990                 return;
5991         }
5992 #endif
5993         sctp_input_with_port(m, off, 0);
5994 }