sys/netinet/sctp_input.c

   1 /*-
   2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2012, 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 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <netinet/sctp_os.h>
  37 #include <netinet/sctp_var.h>
  38 #include <netinet/sctp_sysctl.h>
  39 #include <netinet/sctp_pcb.h>
  40 #include <netinet/sctp_header.h>
  41 #include <netinet/sctputil.h>
  42 #include <netinet/sctp_output.h>
  43 #include <netinet/sctp_input.h>
  44 #include <netinet/sctp_auth.h>
  45 #include <netinet/sctp_indata.h>
  46 #include <netinet/sctp_asconf.h>
  47 #include <netinet/sctp_bsd_addr.h>
  48 #include <netinet/sctp_timer.h>
  49 #include <netinet/sctp_crc32.h>
  50 #if defined(INET) || defined(INET6)
  51 #include <netinet/udp.h>
  52 #endif
  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,
  86     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
  87     struct sctp_init_chunk *cp, struct sctp_inpcb *inp,
  88     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_no_unlock,
  89     uint8_t mflowtype, uint32_t mflowid,
  90     uint32_t vrf_id, uint16_t port)
  91 {
  92         struct sctp_init *init;
  93         struct mbuf *op_err;
  94
  95         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
  96             (void *)stcb);
  97         if (stcb == NULL) {
  98                 SCTP_INP_RLOCK(inp);
  99         }
 100         /* validate length */
 101         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) {
 102                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 103                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 104                     mflowtype, mflowid,
 105                     vrf_id, port);
 106                 if (stcb)
 107                         *abort_no_unlock = 1;
 108                 goto outnow;
 109         }
 110         /* validate parameters */
 111         init = &cp->init;
 112         if (init->initiate_tag == 0) {
 113                 /* protocol error... send abort */
 114                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 115                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 116                     mflowtype, mflowid,
 117                     vrf_id, port);
 118                 if (stcb)
 119                         *abort_no_unlock = 1;
 120                 goto outnow;
 121         }
 122         if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) {
 123                 /* invalid parameter... send abort */
 124                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 125                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 126                     mflowtype, mflowid,
 127                     vrf_id, port);
 128                 if (stcb)
 129                         *abort_no_unlock = 1;
 130                 goto outnow;
 131         }
 132         if (init->num_inbound_streams == 0) {
 133                 /* protocol error... send abort */
 134                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 135                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 136                     mflowtype, mflowid,
 137                     vrf_id, port);
 138                 if (stcb)
 139                         *abort_no_unlock = 1;
 140                 goto outnow;
 141         }
 142         if (init->num_outbound_streams == 0) {
 143                 /* protocol error... send abort */
 144                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 145                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 146                     mflowtype, mflowid,
 147                     vrf_id, port);
 148                 if (stcb)
 149                         *abort_no_unlock = 1;
 150                 goto outnow;
 151         }
 152         if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
 153             offset + ntohs(cp->ch.chunk_length))) {
 154                 /* auth parameter(s) error... send abort */
 155                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 156                     "Problem with AUTH parameters");
 157                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 158                     mflowtype, mflowid,
 159                     vrf_id, port);
 160                 if (stcb)
 161                         *abort_no_unlock = 1;
 162                 goto outnow;
 163         }
 164         /* We are only accepting if we have a socket with positive
 165          * so_qlimit. */
 166         if ((stcb == NULL) &&
 167             ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
 168             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
 169             (inp->sctp_socket == NULL) ||
 170             (inp->sctp_socket->so_qlimit == 0))) {
 171                 /*
 172                  * FIX ME ?? What about TCP model and we have a
 173                  * match/restart case? Actually no fix is needed. the lookup
 174                  * will always find the existing assoc so stcb would not be
 175                  * NULL. It may be questionable to do this since we COULD
 176                  * just send back the INIT-ACK and hope that the app did
 177                  * accept()'s by the time the COOKIE was sent. But there is
 178                  * a price to pay for COOKIE generation and I don't want to
 179                  * pay it on the chance that the app will actually do some
 180                  * accepts(). The App just looses and should NOT be in this
 181                  * state :-)
 182                  */
 183                 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) {
 184                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 185                             "No listener");
 186                         sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
 187                             mflowtype, mflowid, inp->fibnum,
 188                             vrf_id, port);
 189                 }
 190                 goto outnow;
 191         }
 192         if ((stcb != NULL) &&
 193             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 194                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n");
 195                 sctp_send_shutdown_ack(stcb, NULL);
 196                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
 197         } else {
 198                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
 199                 sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset,
 200                     src, dst, sh, cp,
 201                     mflowtype, mflowid,
 202                     vrf_id, port);
 203         }
 204 outnow:
 205         if (stcb == NULL) {
 206                 SCTP_INP_RUNLOCK(inp);
 207         }
 208 }
 209
 210 /*
 211  * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
 212  */
 213
 214 int
 215 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked
 216 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 217     SCTP_UNUSED
 218 #endif
 219 )
 220 {
 221         int unsent_data;
 222         unsigned int i;
 223         struct sctp_stream_queue_pending *sp;
 224         struct sctp_association *asoc;
 225
 226         /*
 227          * This function returns if any stream has true unsent data on it.
 228          * Note that as it looks through it will clean up any places that
 229          * have old data that has been sent but left at top of stream queue.
 230          */
 231         asoc = &stcb->asoc;
 232         unsent_data = 0;
 233         SCTP_TCB_SEND_LOCK(stcb);
 234         if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
 235                 /* Check to see if some data queued */
 236                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 237                         /* sa_ignore FREED_MEMORY */
 238                         sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
 239                         if (sp == NULL) {
 240                                 continue;
 241                         }
 242                         if ((sp->msg_is_complete) &&
 243                             (sp->length == 0) &&
 244                             (sp->sender_all_done)) {
 245                                 /*
 246                                  * We are doing differed cleanup. Last time
 247                                  * through when we took all the data the
 248                                  * sender_all_done was not set.
 249                                  */
 250                                 if (sp->put_last_out == 0) {
 251                                         SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
 252                                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
 253                                             sp->sender_all_done,
 254                                             sp->length,
 255                                             sp->msg_is_complete,
 256                                             sp->put_last_out);
 257                                 }
 258                                 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 259                                 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
 260                                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp, 1);
 261                                 if (sp->net) {
 262                                         sctp_free_remote_addr(sp->net);
 263                                         sp->net = NULL;
 264                                 }
 265                                 if (sp->data) {
 266                                         sctp_m_freem(sp->data);
 267                                         sp->data = NULL;
 268                                 }
 269                                 sctp_free_a_strmoq(stcb, sp, so_locked);
 270                                 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
 271                                         unsent_data++;
 272                                 }
 273                         } else {
 274                                 unsent_data++;
 275                         }
 276                         if (unsent_data > 0) {
 277                                 break;
 278                         }
 279                 }
 280         }
 281         SCTP_TCB_SEND_UNLOCK(stcb);
 282         return (unsent_data);
 283 }
 284
 285 static int
 286 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb)
 287 {
 288         struct sctp_init *init;
 289         struct sctp_association *asoc;
 290         struct sctp_nets *lnet;
 291         unsigned int i;
 292
 293         init = &cp->init;
 294         asoc = &stcb->asoc;
 295         /* save off parameters */
 296         asoc->peer_vtag = ntohl(init->initiate_tag);
 297         asoc->peers_rwnd = ntohl(init->a_rwnd);
 298         /* init tsn's */
 299         asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
 300
 301         if (!TAILQ_EMPTY(&asoc->nets)) {
 302                 /* update any ssthresh's that may have a default */
 303                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
 304                         lnet->ssthresh = asoc->peers_rwnd;
 305                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
 306                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
 307                         }
 308
 309                 }
 310         }
 311         SCTP_TCB_SEND_LOCK(stcb);
 312         if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
 313                 unsigned int newcnt;
 314                 struct sctp_stream_out *outs;
 315                 struct sctp_stream_queue_pending *sp, *nsp;
 316                 struct sctp_tmit_chunk *chk, *nchk;
 317
 318                 /* abandon the upper streams */
 319                 newcnt = ntohs(init->num_inbound_streams);
 320                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
 321                         if (chk->rec.data.sid >= newcnt) {
 322                                 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
 323                                 asoc->send_queue_cnt--;
 324                                 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) {
 325                                         asoc->strmout[chk->rec.data.sid].chunks_on_queues--;
 326 #ifdef INVARIANTS
 327                                 } else {
 328                                         panic("No chunks on the queues for sid %u.", chk->rec.data.sid);
 329 #endif
 330                                 }
 331                                 if (chk->data != NULL) {
 332                                         sctp_free_bufspace(stcb, asoc, chk, 1);
 333                                         sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb,
 334                                             0, chk, SCTP_SO_NOT_LOCKED);
 335                                         if (chk->data) {
 336                                                 sctp_m_freem(chk->data);
 337                                                 chk->data = NULL;
 338                                         }
 339                                 }
 340                                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 341                                 /* sa_ignore FREED_MEMORY */
 342                         }
 343                 }
 344                 if (asoc->strmout) {
 345                         for (i = newcnt; i < asoc->pre_open_streams; i++) {
 346                                 outs = &asoc->strmout[i];
 347                                 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
 348                                         atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 349                                         TAILQ_REMOVE(&outs->outqueue, sp, next);
 350                                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp, 1);
 351                                         sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
 352                                             stcb, 0, sp, SCTP_SO_NOT_LOCKED);
 353                                         if (sp->data) {
 354                                                 sctp_m_freem(sp->data);
 355                                                 sp->data = NULL;
 356                                         }
 357                                         if (sp->net) {
 358                                                 sctp_free_remote_addr(sp->net);
 359                                                 sp->net = NULL;
 360                                         }
 361                                         /* Free the chunk */
 362                                         sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
 363                                         /* sa_ignore FREED_MEMORY */
 364                                 }
 365                                 outs->state = SCTP_STREAM_CLOSED;
 366                         }
 367                 }
 368                 /* cut back the count */
 369                 asoc->pre_open_streams = newcnt;
 370         }
 371         SCTP_TCB_SEND_UNLOCK(stcb);
 372         asoc->streamoutcnt = asoc->pre_open_streams;
 373         if (asoc->strmout) {
 374                 for (i = 0; i < asoc->streamoutcnt; i++) {
 375                         asoc->strmout[i].state = SCTP_STREAM_OPEN;
 376                 }
 377         }
 378         /* EY - nr_sack: initialize highest tsn in nr_mapping_array */
 379         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
 380         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
 381                 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 382         }
 383         /* This is the next one we expect */
 384         asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
 385
 386         asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
 387         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
 388
 389         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
 390         /* open the requested streams */
 391
 392         if (asoc->strmin != NULL) {
 393                 /* Free the old ones */
 394                 for (i = 0; i < asoc->streamincnt; i++) {
 395                         sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue);
 396                         sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue);
 397                 }
 398                 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
 399         }
 400         if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) {
 401                 asoc->streamincnt = ntohs(init->num_outbound_streams);
 402         } else {
 403                 asoc->streamincnt = asoc->max_inbound_streams;
 404         }
 405         SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
 406             sizeof(struct sctp_stream_in), SCTP_M_STRMI);
 407         if (asoc->strmin == NULL) {
 408                 /* we didn't get memory for the streams! */
 409                 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
 410                 return (-1);
 411         }
 412         for (i = 0; i < asoc->streamincnt; i++) {
 413                 asoc->strmin[i].sid = i;
 414                 asoc->strmin[i].last_mid_delivered = 0xffffffff;
 415                 TAILQ_INIT(&asoc->strmin[i].inqueue);
 416                 TAILQ_INIT(&asoc->strmin[i].uno_inqueue);
 417                 asoc->strmin[i].pd_api_started = 0;
 418                 asoc->strmin[i].delivery_started = 0;
 419         }
 420         /*
 421          * load_address_from_init will put the addresses into the
 422          * association when the COOKIE is processed or the INIT-ACK is
 423          * processed. Both types of COOKIE's existing and new call this
 424          * routine. It will remove addresses that are no longer in the
 425          * association (for the restarting case where addresses are
 426          * removed). Up front when the INIT arrives we will discard it if it
 427          * is a restart and new addresses have been added.
 428          */
 429         /* sa_ignore MEMLEAK */
 430         return (0);
 431 }
 432
 433 /*
 434  * INIT-ACK message processing/consumption returns value < 0 on error
 435  */
 436 static int
 437 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
 438     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
 439     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
 440     struct sctp_nets *net, int *abort_no_unlock,
 441     uint8_t mflowtype, uint32_t mflowid,
 442     uint32_t vrf_id)
 443 {
 444         struct sctp_association *asoc;
 445         struct mbuf *op_err;
 446         int retval, abort_flag;
 447         uint32_t initack_limit;
 448         int nat_friendly = 0;
 449
 450         /* First verify that we have no illegal param's */
 451         abort_flag = 0;
 452
 453         op_err = sctp_arethere_unrecognized_parameters(m,
 454             (offset + sizeof(struct sctp_init_chunk)),
 455             &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly);
 456         if (abort_flag) {
 457                 /* Send an abort and notify peer */
 458                 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
 459                 *abort_no_unlock = 1;
 460                 return (-1);
 461         }
 462         asoc = &stcb->asoc;
 463         asoc->peer_supports_nat = (uint8_t)nat_friendly;
 464         /* process the peer's parameters in the INIT-ACK */
 465         retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb);
 466         if (retval < 0) {
 467                 return (retval);
 468         }
 469         initack_limit = offset + ntohs(cp->ch.chunk_length);
 470         /* load all addresses */
 471         if ((retval = sctp_load_addresses_from_init(stcb, m,
 472             (offset + sizeof(struct sctp_init_chunk)), initack_limit,
 473             src, dst, NULL, stcb->asoc.port))) {
 474                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 475                     "Problem with address parameters");
 476                 SCTPDBG(SCTP_DEBUG_INPUT1,
 477                     "Load addresses from INIT causes an abort %d\n",
 478                     retval);
 479                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 480                     src, dst, sh, op_err,
 481                     mflowtype, mflowid,
 482                     vrf_id, net->port);
 483                 *abort_no_unlock = 1;
 484                 return (-1);
 485         }
 486         /* if the peer doesn't support asconf, flush the asconf queue */
 487         if (asoc->asconf_supported == 0) {
 488                 struct sctp_asconf_addr *param, *nparam;
 489
 490                 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
 491                         TAILQ_REMOVE(&asoc->asconf_queue, param, next);
 492                         SCTP_FREE(param, SCTP_M_ASC_ADDR);
 493                 }
 494         }
 495
 496         stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
 497             stcb->asoc.local_hmacs);
 498         if (op_err) {
 499                 sctp_queue_op_err(stcb, op_err);
 500                 /* queuing will steal away the mbuf chain to the out queue */
 501                 op_err = NULL;
 502         }
 503         /* extract the cookie and queue it to "echo" it back... */
 504         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 505                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 506                     stcb->asoc.overall_error_count,
 507                     0,
 508                     SCTP_FROM_SCTP_INPUT,
 509                     __LINE__);
 510         }
 511         stcb->asoc.overall_error_count = 0;
 512         net->error_count = 0;
 513
 514         /*
 515          * Cancel the INIT timer, We do this first before queueing the
 516          * cookie. We always cancel at the primary to assue that we are
 517          * canceling the timer started by the INIT which always goes to the
 518          * primary.
 519          */
 520         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
 521             asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 522
 523         /* calculate the RTO */
 524         net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered,
 525             SCTP_RTT_FROM_NON_DATA);
 526         retval = sctp_send_cookie_echo(m, offset, stcb, net);
 527         if (retval < 0) {
 528                 /*
 529                  * No cookie, we probably should send a op error. But in any
 530                  * case if there is no cookie in the INIT-ACK, we can
 531                  * abandon the peer, its broke.
 532                  */
 533                 if (retval == -3) {
 534                         uint16_t len;
 535
 536                         len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t));
 537                         /* We abort with an error of missing mandatory param */
 538                         op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA);
 539                         if (op_err != NULL) {
 540                                 struct sctp_error_missing_param *cause;
 541
 542                                 SCTP_BUF_LEN(op_err) = len;
 543                                 cause = mtod(op_err, struct sctp_error_missing_param *);
 544                                 /* Subtract the reserved param */
 545                                 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM);
 546                                 cause->cause.length = htons(len);
 547                                 cause->num_missing_params = htonl(1);
 548                                 cause->type[0] = htons(SCTP_STATE_COOKIE);
 549                         }
 550                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 551                             src, dst, sh, op_err,
 552                             mflowtype, mflowid,
 553                             vrf_id, net->port);
 554                         *abort_no_unlock = 1;
 555                 }
 556                 return (retval);
 557         }
 558
 559         return (0);
 560 }
 561
 562 static void
 563 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
 564     struct sctp_tcb *stcb, struct sctp_nets *net)
 565 {
 566         union sctp_sockstore store;
 567         struct sctp_nets *r_net, *f_net;
 568         struct timeval tv;
 569         int req_prim = 0;
 570         uint16_t old_error_counter;
 571
 572         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
 573                 /* Invalid length */
 574                 return;
 575         }
 576
 577         memset(&store, 0, sizeof(store));
 578         switch (cp->heartbeat.hb_info.addr_family) {
 579 #ifdef INET
 580         case AF_INET:
 581                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
 582                         store.sin.sin_family = cp->heartbeat.hb_info.addr_family;
 583                         store.sin.sin_len = cp->heartbeat.hb_info.addr_len;
 584                         store.sin.sin_port = stcb->rport;
 585                         memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address,
 586                             sizeof(store.sin.sin_addr));
 587                 } else {
 588                         return;
 589                 }
 590                 break;
 591 #endif
 592 #ifdef INET6
 593         case AF_INET6:
 594                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
 595                         store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family;
 596                         store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len;
 597                         store.sin6.sin6_port = stcb->rport;
 598                         memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr));
 599                 } else {
 600                         return;
 601                 }
 602                 break;
 603 #endif
 604         default:
 605                 return;
 606         }
 607         r_net = sctp_findnet(stcb, &store.sa);
 608         if (r_net == NULL) {
 609                 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
 610                 return;
 611         }
 612         if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 613             (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
 614             (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
 615                 /*
 616                  * If the its a HB and it's random value is correct when can
 617                  * confirm the destination.
 618                  */
 619                 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 620                 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
 621                         stcb->asoc.primary_destination = r_net;
 622                         r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
 623                         f_net = TAILQ_FIRST(&stcb->asoc.nets);
 624                         if (f_net != r_net) {
 625                                 /*
 626                                  * first one on the list is NOT the primary
 627                                  * sctp_cmpaddr() is much more efficient if
 628                                  * the primary is the first on the list,
 629                                  * make it so.
 630                                  */
 631                                 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
 632                                 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
 633                         }
 634                         req_prim = 1;
 635                 }
 636                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 637                     stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 638                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb,
 639                     r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
 640                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 641         }
 642         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 643                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 644                     stcb->asoc.overall_error_count,
 645                     0,
 646                     SCTP_FROM_SCTP_INPUT,
 647                     __LINE__);
 648         }
 649         stcb->asoc.overall_error_count = 0;
 650         old_error_counter = r_net->error_count;
 651         r_net->error_count = 0;
 652         r_net->hb_responded = 1;
 653         tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
 654         tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
 655         /* Now lets do a RTO with this */
 656         r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv,
 657             SCTP_RTT_FROM_NON_DATA);
 658         if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
 659                 r_net->dest_state |= SCTP_ADDR_REACHABLE;
 660                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
 661                     0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 662         }
 663         if (r_net->dest_state & SCTP_ADDR_PF) {
 664                 r_net->dest_state &= ~SCTP_ADDR_PF;
 665                 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
 666         }
 667         if (old_error_counter > 0) {
 668                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
 669                     stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5);
 670                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 671         }
 672         if (r_net == stcb->asoc.primary_destination) {
 673                 if (stcb->asoc.alternate) {
 674                         /* release the alternate, primary is good */
 675                         sctp_free_remote_addr(stcb->asoc.alternate);
 676                         stcb->asoc.alternate = NULL;
 677                 }
 678         }
 679         /* Mobility adaptation */
 680         if (req_prim) {
 681                 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
 682                     SCTP_MOBILITY_BASE) ||
 683                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 684                     SCTP_MOBILITY_FASTHANDOFF)) &&
 685                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 686                     SCTP_MOBILITY_PRIM_DELETED)) {
 687
 688                         sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED,
 689                             stcb->sctp_ep, stcb, NULL,
 690                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 691                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 692                             SCTP_MOBILITY_FASTHANDOFF)) {
 693                                 sctp_assoc_immediate_retrans(stcb,
 694                                     stcb->asoc.primary_destination);
 695                         }
 696                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 697                             SCTP_MOBILITY_BASE)) {
 698                                 sctp_move_chunks_from_net(stcb,
 699                                     stcb->asoc.deleted_primary);
 700                         }
 701                         sctp_delete_prim_timer(stcb->sctp_ep, stcb,
 702                             stcb->asoc.deleted_primary);
 703                 }
 704         }
 705 }
 706
 707 static int
 708 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
 709 {
 710         /*
 711          * return 0 means we want you to proceed with the abort non-zero
 712          * means no abort processing
 713          */
 714         struct sctpasochead *head;
 715
 716         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
 717             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
 718                 atomic_add_int(&stcb->asoc.refcnt, 1);
 719                 SCTP_TCB_UNLOCK(stcb);
 720                 SCTP_INP_INFO_WLOCK();
 721                 SCTP_TCB_LOCK(stcb);
 722                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 723         }
 724         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) {
 725                 /* generate a new vtag and send init */
 726                 LIST_REMOVE(stcb, sctp_asocs);
 727                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 728                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 729                 /*
 730                  * put it in the bucket in the vtag hash of assoc's for the
 731                  * system
 732                  */
 733                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 734                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 735                 SCTP_INP_INFO_WUNLOCK();
 736                 return (1);
 737         }
 738         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) {
 739                 /*
 740                  * treat like a case where the cookie expired i.e.: - dump
 741                  * current cookie. - generate a new vtag. - resend init.
 742                  */
 743                 /* generate a new vtag and send init */
 744                 LIST_REMOVE(stcb, sctp_asocs);
 745                 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
 746                 sctp_stop_all_cookie_timers(stcb);
 747                 sctp_toss_old_cookies(stcb, &stcb->asoc);
 748                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 749                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 750                 /*
 751                  * put it in the bucket in the vtag hash of assoc's for the
 752                  * system
 753                  */
 754                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 755                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 756                 SCTP_INP_INFO_WUNLOCK();
 757                 return (1);
 758         }
 759         return (0);
 760 }
 761
 762 static int
 763 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
 764     struct sctp_nets *net)
 765 {
 766         /*
 767          * return 0 means we want you to proceed with the abort non-zero
 768          * means no abort processing
 769          */
 770         if (stcb->asoc.auth_supported == 0) {
 771                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
 772                 return (0);
 773         }
 774         sctp_asconf_send_nat_state_update(stcb, net);
 775         return (1);
 776 }
 777
 778
 779 /* Returns 1 if the stcb was aborted, 0 otherwise */
 780 static int
 781 sctp_handle_abort(struct sctp_abort_chunk *abort,
 782     struct sctp_tcb *stcb, struct sctp_nets *net)
 783 {
 784 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 785         struct socket *so;
 786 #endif
 787         uint16_t len;
 788         uint16_t error;
 789
 790         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
 791         if (stcb == NULL)
 792                 return (0);
 793
 794         len = ntohs(abort->ch.chunk_length);
 795         if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) {
 796                 /*
 797                  * Need to check the cause codes for our two magic nat
 798                  * aborts which don't kill the assoc necessarily.
 799                  */
 800                 struct sctp_error_cause *cause;
 801
 802                 cause = (struct sctp_error_cause *)(abort + 1);
 803                 error = ntohs(cause->code);
 804                 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) {
 805                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
 806                             abort->ch.chunk_flags);
 807                         if (sctp_handle_nat_colliding_state(stcb)) {
 808                                 return (0);
 809                         }
 810                 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) {
 811                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
 812                             abort->ch.chunk_flags);
 813                         if (sctp_handle_nat_missing_state(stcb, net)) {
 814                                 return (0);
 815                         }
 816                 }
 817         } else {
 818                 error = 0;
 819         }
 820         /* stop any receive timers */
 821         sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net,
 822             SCTP_FROM_SCTP_INPUT + SCTP_LOC_7);
 823         /* notify user of the abort and clean up... */
 824         sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED);
 825         /* free the tcb */
 826         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
 827         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
 828             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 829                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 830         }
 831 #ifdef SCTP_ASOCLOG_OF_TSNS
 832         sctp_print_out_track_log(stcb);
 833 #endif
 834 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 835         so = SCTP_INP_SO(stcb->sctp_ep);
 836         atomic_add_int(&stcb->asoc.refcnt, 1);
 837         SCTP_TCB_UNLOCK(stcb);
 838         SCTP_SOCKET_LOCK(so, 1);
 839         SCTP_TCB_LOCK(stcb);
 840         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 841 #endif
 842         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_WAS_ABORTED);
 843         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 844             SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
 845 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 846         SCTP_SOCKET_UNLOCK(so, 1);
 847 #endif
 848         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
 849         return (1);
 850 }
 851
 852 static void
 853 sctp_start_net_timers(struct sctp_tcb *stcb)
 854 {
 855         uint32_t cnt_hb_sent;
 856         struct sctp_nets *net;
 857
 858         cnt_hb_sent = 0;
 859         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 860                 /*
 861                  * For each network start: 1) A pmtu timer. 2) A HB timer 3)
 862                  * If the dest in unconfirmed send a hb as well if under
 863                  * max_hb_burst have been sent.
 864                  */
 865                 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
 866                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
 867                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
 868                     (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
 869                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 870                         cnt_hb_sent++;
 871                 }
 872         }
 873         if (cnt_hb_sent) {
 874                 sctp_chunk_output(stcb->sctp_ep, stcb,
 875                     SCTP_OUTPUT_FROM_COOKIE_ACK,
 876                     SCTP_SO_NOT_LOCKED);
 877         }
 878 }
 879
 880
 881 static void
 882 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
 883     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
 884 {
 885         struct sctp_association *asoc;
 886         int some_on_streamwheel;
 887         int old_state;
 888 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 889         struct socket *so;
 890 #endif
 891
 892         SCTPDBG(SCTP_DEBUG_INPUT2,
 893             "sctp_handle_shutdown: handling SHUTDOWN\n");
 894         if (stcb == NULL)
 895                 return;
 896         asoc = &stcb->asoc;
 897         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
 898             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
 899                 return;
 900         }
 901         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
 902                 /* Shutdown NOT the expected size */
 903                 return;
 904         }
 905         old_state = SCTP_GET_STATE(stcb);
 906         sctp_update_acked(stcb, cp, abort_flag);
 907         if (*abort_flag) {
 908                 return;
 909         }
 910         if (asoc->control_pdapi) {
 911                 /*
 912                  * With a normal shutdown we assume the end of last record.
 913                  */
 914                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 915                 if (asoc->control_pdapi->on_strm_q) {
 916                         struct sctp_stream_in *strm;
 917
 918                         strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream];
 919                         if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) {
 920                                 /* Unordered */
 921                                 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm);
 922                                 asoc->control_pdapi->on_strm_q = 0;
 923                         } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) {
 924                                 /* Ordered */
 925                                 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm);
 926                                 asoc->control_pdapi->on_strm_q = 0;
 927 #ifdef INVARIANTS
 928                         } else {
 929                                 panic("Unknown state on ctrl:%p on_strm_q:%d",
 930                                     asoc->control_pdapi,
 931                                     asoc->control_pdapi->on_strm_q);
 932 #endif
 933                         }
 934                 }
 935                 asoc->control_pdapi->end_added = 1;
 936                 asoc->control_pdapi->pdapi_aborted = 1;
 937                 asoc->control_pdapi = NULL;
 938                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 939 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 940                 so = SCTP_INP_SO(stcb->sctp_ep);
 941                 atomic_add_int(&stcb->asoc.refcnt, 1);
 942                 SCTP_TCB_UNLOCK(stcb);
 943                 SCTP_SOCKET_LOCK(so, 1);
 944                 SCTP_TCB_LOCK(stcb);
 945                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 946                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 947                         /* assoc was freed while we were unlocked */
 948                         SCTP_SOCKET_UNLOCK(so, 1);
 949                         return;
 950                 }
 951 #endif
 952                 if (stcb->sctp_socket) {
 953                         sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 954                 }
 955 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 956                 SCTP_SOCKET_UNLOCK(so, 1);
 957 #endif
 958         }
 959         /* goto SHUTDOWN_RECEIVED state to block new requests */
 960         if (stcb->sctp_socket) {
 961                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 962                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
 963                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) {
 964                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_RECEIVED);
 965                         SCTP_CLEAR_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
 966                         /*
 967                          * notify upper layer that peer has initiated a
 968                          * shutdown
 969                          */
 970                         sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 971
 972                         /* reset time */
 973                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
 974                 }
 975         }
 976         if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) {
 977                 /*
 978                  * stop the shutdown timer, since we WILL move to
 979                  * SHUTDOWN-ACK-SENT.
 980                  */
 981                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
 982                     net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
 983         }
 984         /* Now is there unsent data on a stream somewhere? */
 985         some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
 986
 987         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 988             !TAILQ_EMPTY(&asoc->sent_queue) ||
 989             some_on_streamwheel) {
 990                 /* By returning we will push more data out */
 991                 return;
 992         } else {
 993                 /* no outstanding data to send, so move on... */
 994                 /* send SHUTDOWN-ACK */
 995                 /* move to SHUTDOWN-ACK-SENT state */
 996                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
 997                     (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 998                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 999                 }
1000                 SCTP_CLEAR_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
1001                 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
1002                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_ACK_SENT);
1003                         sctp_stop_timers_for_shutdown(stcb);
1004                         sctp_send_shutdown_ack(stcb, net);
1005                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
1006                             stcb->sctp_ep, stcb, net);
1007                 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1008                         sctp_send_shutdown_ack(stcb, net);
1009                 }
1010         }
1011 }
1012
1013 static void
1014 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
1015     struct sctp_tcb *stcb,
1016     struct sctp_nets *net)
1017 {
1018         struct sctp_association *asoc;
1019 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1020         struct socket *so;
1021
1022         so = SCTP_INP_SO(stcb->sctp_ep);
1023 #endif
1024         SCTPDBG(SCTP_DEBUG_INPUT2,
1025             "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
1026         if (stcb == NULL)
1027                 return;
1028
1029         asoc = &stcb->asoc;
1030         /* process according to association state */
1031         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
1032             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
1033                 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
1034                 sctp_send_shutdown_complete(stcb, net, 1);
1035                 SCTP_TCB_UNLOCK(stcb);
1036                 return;
1037         }
1038         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
1039             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
1040                 /* unexpected SHUTDOWN-ACK... so ignore... */
1041                 SCTP_TCB_UNLOCK(stcb);
1042                 return;
1043         }
1044         if (asoc->control_pdapi) {
1045                 /*
1046                  * With a normal shutdown we assume the end of last record.
1047                  */
1048                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
1049                 asoc->control_pdapi->end_added = 1;
1050                 asoc->control_pdapi->pdapi_aborted = 1;
1051                 asoc->control_pdapi = NULL;
1052                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
1053 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1054                 atomic_add_int(&stcb->asoc.refcnt, 1);
1055                 SCTP_TCB_UNLOCK(stcb);
1056                 SCTP_SOCKET_LOCK(so, 1);
1057                 SCTP_TCB_LOCK(stcb);
1058                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1059                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1060                         /* assoc was freed while we were unlocked */
1061                         SCTP_SOCKET_UNLOCK(so, 1);
1062                         return;
1063                 }
1064 #endif
1065                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
1066 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1067                 SCTP_SOCKET_UNLOCK(so, 1);
1068 #endif
1069         }
1070 #ifdef INVARIANTS
1071         if (!TAILQ_EMPTY(&asoc->send_queue) ||
1072             !TAILQ_EMPTY(&asoc->sent_queue) ||
1073             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
1074                 panic("Queues are not empty when handling SHUTDOWN-ACK");
1075         }
1076 #endif
1077         /* stop the timer */
1078         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net,
1079             SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
1080         /* send SHUTDOWN-COMPLETE */
1081         sctp_send_shutdown_complete(stcb, net, 0);
1082         /* notify upper layer protocol */
1083         if (stcb->sctp_socket) {
1084                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1085                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
1086                         stcb->sctp_socket->so_snd.sb_cc = 0;
1087                 }
1088                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
1089         }
1090         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1091         /* free the TCB but first save off the ep */
1092 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1093         atomic_add_int(&stcb->asoc.refcnt, 1);
1094         SCTP_TCB_UNLOCK(stcb);
1095         SCTP_SOCKET_LOCK(so, 1);
1096         SCTP_TCB_LOCK(stcb);
1097         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1098 #endif
1099         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1100             SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1101 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1102         SCTP_SOCKET_UNLOCK(so, 1);
1103 #endif
1104 }
1105
1106 static void
1107 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type,
1108     struct sctp_nets *net)
1109 {
1110         switch (chunk_type) {
1111         case SCTP_ASCONF_ACK:
1112         case SCTP_ASCONF:
1113                 sctp_asconf_cleanup(stcb, net);
1114                 break;
1115         case SCTP_IFORWARD_CUM_TSN:
1116         case SCTP_FORWARD_CUM_TSN:
1117                 stcb->asoc.prsctp_supported = 0;
1118                 break;
1119         default:
1120                 SCTPDBG(SCTP_DEBUG_INPUT2,
1121                     "Peer does not support chunk type %d (0x%x).\n",
1122                     chunk_type, chunk_type);
1123                 break;
1124         }
1125 }
1126
1127 /*
1128  * Skip past the param header and then we will find the param that caused the
1129  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1130  * these will turn of specific features.
1131  * XXX: Is this the right thing to do?
1132  */
1133 static void
1134 sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type)
1135 {
1136         switch (parameter_type) {
1137                 /* pr-sctp draft */
1138         case SCTP_PRSCTP_SUPPORTED:
1139                 stcb->asoc.prsctp_supported = 0;
1140                 break;
1141         case SCTP_SUPPORTED_CHUNK_EXT:
1142                 break;
1143                 /* draft-ietf-tsvwg-addip-sctp */
1144         case SCTP_HAS_NAT_SUPPORT:
1145                 stcb->asoc.peer_supports_nat = 0;
1146                 break;
1147         case SCTP_ADD_IP_ADDRESS:
1148         case SCTP_DEL_IP_ADDRESS:
1149         case SCTP_SET_PRIM_ADDR:
1150                 stcb->asoc.asconf_supported = 0;
1151                 break;
1152         case SCTP_SUCCESS_REPORT:
1153         case SCTP_ERROR_CAUSE_IND:
1154                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1155                 SCTPDBG(SCTP_DEBUG_INPUT2,
1156                     "Turning off ASCONF to this strange peer\n");
1157                 stcb->asoc.asconf_supported = 0;
1158                 break;
1159         default:
1160                 SCTPDBG(SCTP_DEBUG_INPUT2,
1161                     "Peer does not support param type %d (0x%x)??\n",
1162                     parameter_type, parameter_type);
1163                 break;
1164         }
1165 }
1166
1167 static int
1168 sctp_handle_error(struct sctp_chunkhdr *ch,
1169     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
1170 {
1171         struct sctp_error_cause *cause;
1172         struct sctp_association *asoc;
1173         uint32_t remaining_length, adjust;
1174         uint16_t code, cause_code, cause_length;
1175 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1176         struct socket *so;
1177 #endif
1178
1179         /* parse through all of the errors and process */
1180         asoc = &stcb->asoc;
1181         cause = (struct sctp_error_cause *)((caddr_t)ch +
1182             sizeof(struct sctp_chunkhdr));
1183         remaining_length = ntohs(ch->chunk_length);
1184         if (remaining_length > limit) {
1185                 remaining_length = limit;
1186         }
1187         if (remaining_length >= sizeof(struct sctp_chunkhdr)) {
1188                 remaining_length -= sizeof(struct sctp_chunkhdr);
1189         } else {
1190                 remaining_length = 0;
1191         }
1192         code = 0;
1193         while (remaining_length >= sizeof(struct sctp_error_cause)) {
1194                 /* Process an Error Cause */
1195                 cause_code = ntohs(cause->code);
1196                 cause_length = ntohs(cause->length);
1197                 if ((cause_length > remaining_length) || (cause_length == 0)) {
1198                         /* Invalid cause length, possibly due to truncation. */
1199                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n",
1200                             remaining_length, cause_length);
1201                         return (0);
1202                 }
1203                 if (code == 0) {
1204                         /* report the first error cause */
1205                         code = cause_code;
1206                 }
1207                 switch (cause_code) {
1208                 case SCTP_CAUSE_INVALID_STREAM:
1209                 case SCTP_CAUSE_MISSING_PARAM:
1210                 case SCTP_CAUSE_INVALID_PARAM:
1211                 case SCTP_CAUSE_NO_USER_DATA:
1212                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n",
1213                             cause_code);
1214                         break;
1215                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1216                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags: %x\n",
1217                             ch->chunk_flags);
1218                         if (sctp_handle_nat_colliding_state(stcb)) {
1219                                 return (0);
1220                         }
1221                         break;
1222                 case SCTP_CAUSE_NAT_MISSING_STATE:
1223                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags: %x\n",
1224                             ch->chunk_flags);
1225                         if (sctp_handle_nat_missing_state(stcb, net)) {
1226                                 return (0);
1227                         }
1228                         break;
1229                 case SCTP_CAUSE_STALE_COOKIE:
1230                         /*
1231                          * We only act if we have echoed a cookie and are
1232                          * waiting.
1233                          */
1234                         if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) &&
1235                             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
1236                                 struct sctp_error_stale_cookie *stale_cookie;
1237
1238                                 stale_cookie = (struct sctp_error_stale_cookie *)cause;
1239                                 asoc->cookie_preserve_req = ntohl(stale_cookie->stale_time);
1240                                 /* Double it to be more robust on RTX */
1241                                 if (asoc->cookie_preserve_req <= UINT32_MAX / 2) {
1242                                         asoc->cookie_preserve_req *= 2;
1243                                 } else {
1244                                         asoc->cookie_preserve_req = UINT32_MAX;
1245                                 }
1246                                 asoc->stale_cookie_count++;
1247                                 if (asoc->stale_cookie_count >
1248                                     asoc->max_init_times) {
1249                                         sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED);
1250                                         /* now free the asoc */
1251 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1252                                         so = SCTP_INP_SO(stcb->sctp_ep);
1253                                         atomic_add_int(&stcb->asoc.refcnt, 1);
1254                                         SCTP_TCB_UNLOCK(stcb);
1255                                         SCTP_SOCKET_LOCK(so, 1);
1256                                         SCTP_TCB_LOCK(stcb);
1257                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1258 #endif
1259                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1260                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1261 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1262                                         SCTP_SOCKET_UNLOCK(so, 1);
1263 #endif
1264                                         return (-1);
1265                                 }
1266                                 /* blast back to INIT state */
1267                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
1268                                 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
1269                                 sctp_stop_all_cookie_timers(stcb);
1270                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1271                         }
1272                         break;
1273                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1274                         /*
1275                          * Nothing we can do here, we don't do hostname
1276                          * addresses so if the peer does not like my IPv6
1277                          * (or IPv4 for that matter) it does not matter. If
1278                          * they don't support that type of address, they can
1279                          * NOT possibly get that packet type... i.e. with no
1280                          * IPv6 you can't receive a IPv6 packet. so we can
1281                          * safely ignore this one. If we ever added support
1282                          * for HOSTNAME Addresses, then we would need to do
1283                          * something here.
1284                          */
1285                         break;
1286                 case SCTP_CAUSE_UNRECOG_CHUNK:
1287                         if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) {
1288                                 struct sctp_error_unrecognized_chunk *unrec_chunk;
1289
1290                                 unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause;
1291                                 sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type, net);
1292                         }
1293                         break;
1294                 case SCTP_CAUSE_UNRECOG_PARAM:
1295                         /* XXX: We only consider the first parameter */
1296                         if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) {
1297                                 struct sctp_paramhdr *unrec_parameter;
1298
1299                                 unrec_parameter = (struct sctp_paramhdr *)(cause + 1);
1300                                 sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type));
1301                         }
1302                         break;
1303                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1304                         /*
1305                          * We ignore this since the timer will drive out a
1306                          * new cookie anyway and there timer will drive us
1307                          * to send a SHUTDOWN_COMPLETE. We can't send one
1308                          * here since we don't have their tag.
1309                          */
1310                         break;
1311                 case SCTP_CAUSE_DELETING_LAST_ADDR:
1312                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1313                 case SCTP_CAUSE_DELETING_SRC_ADDR:
1314                         /*
1315                          * We should NOT get these here, but in a
1316                          * ASCONF-ACK.
1317                          */
1318                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n",
1319                             cause_code);
1320                         break;
1321                 case SCTP_CAUSE_OUT_OF_RESC:
1322                         /*
1323                          * And what, pray tell do we do with the fact that
1324                          * the peer is out of resources? Not really sure we
1325                          * could do anything but abort. I suspect this
1326                          * should have came WITH an abort instead of in a
1327                          * OP-ERROR.
1328                          */
1329                         break;
1330                 default:
1331                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n",
1332                             cause_code);
1333                         break;
1334                 }
1335                 adjust = SCTP_SIZE32(cause_length);
1336                 if (remaining_length >= adjust) {
1337                         remaining_length -= adjust;
1338                 } else {
1339                         remaining_length = 0;
1340                 }
1341                 cause = (struct sctp_error_cause *)((caddr_t)cause + adjust);
1342         }
1343         sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED);
1344         return (0);
1345 }
1346
1347 static int
1348 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1349     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
1350     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1351     struct sctp_nets *net, int *abort_no_unlock,
1352     uint8_t mflowtype, uint32_t mflowid,
1353     uint32_t vrf_id)
1354 {
1355         struct sctp_init_ack *init_ack;
1356         struct mbuf *op_err;
1357
1358         SCTPDBG(SCTP_DEBUG_INPUT2,
1359             "sctp_handle_init_ack: handling INIT-ACK\n");
1360
1361         if (stcb == NULL) {
1362                 SCTPDBG(SCTP_DEBUG_INPUT2,
1363                     "sctp_handle_init_ack: TCB is null\n");
1364                 return (-1);
1365         }
1366         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1367                 /* Invalid length */
1368                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1369                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1370                     src, dst, sh, op_err,
1371                     mflowtype, mflowid,
1372                     vrf_id, net->port);
1373                 *abort_no_unlock = 1;
1374                 return (-1);
1375         }
1376         init_ack = &cp->init;
1377         /* validate parameters */
1378         if (init_ack->initiate_tag == 0) {
1379                 /* protocol error... send an abort */
1380                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1381                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1382                     src, dst, sh, op_err,
1383                     mflowtype, mflowid,
1384                     vrf_id, net->port);
1385                 *abort_no_unlock = 1;
1386                 return (-1);
1387         }
1388         if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1389                 /* protocol error... send an abort */
1390                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1391                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1392                     src, dst, sh, op_err,
1393                     mflowtype, mflowid,
1394                     vrf_id, net->port);
1395                 *abort_no_unlock = 1;
1396                 return (-1);
1397         }
1398         if (init_ack->num_inbound_streams == 0) {
1399                 /* protocol error... send an abort */
1400                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1401                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1402                     src, dst, sh, op_err,
1403                     mflowtype, mflowid,
1404                     vrf_id, net->port);
1405                 *abort_no_unlock = 1;
1406                 return (-1);
1407         }
1408         if (init_ack->num_outbound_streams == 0) {
1409                 /* protocol error... send an abort */
1410                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1411                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1412                     src, dst, sh, op_err,
1413                     mflowtype, mflowid,
1414                     vrf_id, net->port);
1415                 *abort_no_unlock = 1;
1416                 return (-1);
1417         }
1418         /* process according to association state... */
1419         switch (SCTP_GET_STATE(stcb)) {
1420         case SCTP_STATE_COOKIE_WAIT:
1421                 /* this is the expected state for this chunk */
1422                 /* process the INIT-ACK parameters */
1423                 if (stcb->asoc.primary_destination->dest_state &
1424                     SCTP_ADDR_UNCONFIRMED) {
1425                         /*
1426                          * The primary is where we sent the INIT, we can
1427                          * always consider it confirmed when the INIT-ACK is
1428                          * returned. Do this before we load addresses
1429                          * though.
1430                          */
1431                         stcb->asoc.primary_destination->dest_state &=
1432                             ~SCTP_ADDR_UNCONFIRMED;
1433                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1434                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1435                 }
1436                 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
1437                     net, abort_no_unlock,
1438                     mflowtype, mflowid,
1439                     vrf_id) < 0) {
1440                         /* error in parsing parameters */
1441                         return (-1);
1442                 }
1443                 /* update our state */
1444                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1445                 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_ECHOED);
1446
1447                 /* reset the RTO calc */
1448                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1449                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1450                             stcb->asoc.overall_error_count,
1451                             0,
1452                             SCTP_FROM_SCTP_INPUT,
1453                             __LINE__);
1454                 }
1455                 stcb->asoc.overall_error_count = 0;
1456                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1457                 /*
1458                  * collapse the init timer back in case of a exponential
1459                  * backoff
1460                  */
1461                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1462                     stcb, net);
1463                 /*
1464                  * the send at the end of the inbound data processing will
1465                  * cause the cookie to be sent
1466                  */
1467                 break;
1468         case SCTP_STATE_SHUTDOWN_SENT:
1469                 /* incorrect state... discard */
1470                 break;
1471         case SCTP_STATE_COOKIE_ECHOED:
1472                 /* incorrect state... discard */
1473                 break;
1474         case SCTP_STATE_OPEN:
1475                 /* incorrect state... discard */
1476                 break;
1477         case SCTP_STATE_EMPTY:
1478         case SCTP_STATE_INUSE:
1479         default:
1480                 /* incorrect state... discard */
1481                 return (-1);
1482                 break;
1483         }
1484         SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1485         return (0);
1486 }
1487
1488 static struct sctp_tcb *
1489 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1490     struct sockaddr *src, struct sockaddr *dst,
1491     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1492     struct sctp_inpcb *inp, struct sctp_nets **netp,
1493     struct sockaddr *init_src, int *notification,
1494     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1495     uint8_t mflowtype, uint32_t mflowid,
1496     uint32_t vrf_id, uint16_t port);
1497
1498
1499 /*
1500  * handle a state cookie for an existing association m: input packet mbuf
1501  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1502  * "split" mbuf and the cookie signature does not exist offset: offset into
1503  * mbuf to the cookie-echo chunk
1504  */
1505 static struct sctp_tcb *
1506 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1507     struct sockaddr *src, struct sockaddr *dst,
1508     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1509     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1510     struct sockaddr *init_src, int *notification,
1511     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1512     uint8_t mflowtype, uint32_t mflowid,
1513     uint32_t vrf_id, uint16_t port)
1514 {
1515         struct sctp_association *asoc;
1516         struct sctp_init_chunk *init_cp, init_buf;
1517         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1518         struct sctp_nets *net;
1519         struct mbuf *op_err;
1520         struct timeval old;
1521         int init_offset, initack_offset, i;
1522         int retval;
1523         int spec_flag = 0;
1524         uint32_t how_indx;
1525 #if defined(SCTP_DETAILED_STR_STATS)
1526         int j;
1527 #endif
1528
1529         net = *netp;
1530         /* I know that the TCB is non-NULL from the caller */
1531         asoc = &stcb->asoc;
1532         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1533                 if (asoc->cookie_how[how_indx] == 0)
1534                         break;
1535         }
1536         if (how_indx < sizeof(asoc->cookie_how)) {
1537                 asoc->cookie_how[how_indx] = 1;
1538         }
1539         if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1540                 /* SHUTDOWN came in after sending INIT-ACK */
1541                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1542                 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, "");
1543                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
1544                     mflowtype, mflowid, inp->fibnum,
1545                     vrf_id, net->port);
1546                 if (how_indx < sizeof(asoc->cookie_how))
1547                         asoc->cookie_how[how_indx] = 2;
1548                 return (NULL);
1549         }
1550         /*
1551          * find and validate the INIT chunk in the cookie (peer's info) the
1552          * INIT should start after the cookie-echo header struct (chunk
1553          * header, state cookie header struct)
1554          */
1555         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1556
1557         init_cp = (struct sctp_init_chunk *)
1558             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1559             (uint8_t *)&init_buf);
1560         if (init_cp == NULL) {
1561                 /* could not pull a INIT chunk in cookie */
1562                 return (NULL);
1563         }
1564         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1565                 return (NULL);
1566         }
1567         /*
1568          * find and validate the INIT-ACK chunk in the cookie (my info) the
1569          * INIT-ACK follows the INIT chunk
1570          */
1571         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1572         initack_cp = (struct sctp_init_ack_chunk *)
1573             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1574             (uint8_t *)&initack_buf);
1575         if (initack_cp == NULL) {
1576                 /* could not pull INIT-ACK chunk in cookie */
1577                 return (NULL);
1578         }
1579         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1580                 return (NULL);
1581         }
1582         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1583             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1584                 /*
1585                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
1586                  * to get into the OPEN state
1587                  */
1588                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1589                         /*-
1590                          * Opps, this means that we somehow generated two vtag's
1591                          * the same. I.e. we did:
1592                          *  Us               Peer
1593                          *   <---INIT(tag=a)------
1594                          *   ----INIT-ACK(tag=t)-->
1595                          *   ----INIT(tag=t)------> *1
1596                          *   <---INIT-ACK(tag=a)---
1597                          *   <----CE(tag=t)------------- *2
1598                          *
1599                          * At point *1 we should be generating a different
1600                          * tag t'. Which means we would throw away the CE and send
1601                          * ours instead. Basically this is case C (throw away side).
1602                          */
1603                         if (how_indx < sizeof(asoc->cookie_how))
1604                                 asoc->cookie_how[how_indx] = 17;
1605                         return (NULL);
1606
1607                 }
1608                 switch (SCTP_GET_STATE(stcb)) {
1609                 case SCTP_STATE_COOKIE_WAIT:
1610                 case SCTP_STATE_COOKIE_ECHOED:
1611                         /*
1612                          * INIT was sent but got a COOKIE_ECHO with the
1613                          * correct tags... just accept it...but we must
1614                          * process the init so that we can make sure we have
1615                          * the right seq no's.
1616                          */
1617                         /* First we must process the INIT !! */
1618                         retval = sctp_process_init(init_cp, stcb);
1619                         if (retval < 0) {
1620                                 if (how_indx < sizeof(asoc->cookie_how))
1621                                         asoc->cookie_how[how_indx] = 3;
1622                                 return (NULL);
1623                         }
1624                         /* we have already processed the INIT so no problem */
1625                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp,
1626                             stcb, net,
1627                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1628                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp,
1629                             stcb, net,
1630                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1631                         /* update current state */
1632                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)
1633                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1634                         else
1635                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1636
1637                         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1638                         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1639                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1640                                     stcb->sctp_ep, stcb, asoc->primary_destination);
1641                         }
1642                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1643                         sctp_stop_all_cookie_timers(stcb);
1644                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1645                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1646                             (inp->sctp_socket->so_qlimit == 0)
1647                             ) {
1648 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1649                                 struct socket *so;
1650 #endif
1651                                 /*
1652                                  * Here is where collision would go if we
1653                                  * did a connect() and instead got a
1654                                  * init/init-ack/cookie done before the
1655                                  * init-ack came back..
1656                                  */
1657                                 stcb->sctp_ep->sctp_flags |=
1658                                     SCTP_PCB_FLAGS_CONNECTED;
1659 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1660                                 so = SCTP_INP_SO(stcb->sctp_ep);
1661                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1662                                 SCTP_TCB_UNLOCK(stcb);
1663                                 SCTP_SOCKET_LOCK(so, 1);
1664                                 SCTP_TCB_LOCK(stcb);
1665                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1666                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1667                                         SCTP_SOCKET_UNLOCK(so, 1);
1668                                         return (NULL);
1669                                 }
1670 #endif
1671                                 soisconnected(stcb->sctp_socket);
1672 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1673                                 SCTP_SOCKET_UNLOCK(so, 1);
1674 #endif
1675                         }
1676                         /* notify upper layer */
1677                         *notification = SCTP_NOTIFY_ASSOC_UP;
1678                         /*
1679                          * since we did not send a HB make sure we don't
1680                          * double things
1681                          */
1682                         old.tv_sec = cookie->time_entered.tv_sec;
1683                         old.tv_usec = cookie->time_entered.tv_usec;
1684                         net->hb_responded = 1;
1685                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
1686                             &old,
1687                             SCTP_RTT_FROM_NON_DATA);
1688
1689                         if (stcb->asoc.sctp_autoclose_ticks &&
1690                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1691                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1692                                     inp, stcb, NULL);
1693                         }
1694                         break;
1695                 default:
1696                         /*
1697                          * we're in the OPEN state (or beyond), so peer must
1698                          * have simply lost the COOKIE-ACK
1699                          */
1700                         break;
1701                 }               /* end switch */
1702                 sctp_stop_all_cookie_timers(stcb);
1703                 /*
1704                  * We ignore the return code here.. not sure if we should
1705                  * somehow abort.. but we do have an existing asoc. This
1706                  * really should not fail.
1707                  */
1708                 if (sctp_load_addresses_from_init(stcb, m,
1709                     init_offset + sizeof(struct sctp_init_chunk),
1710                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
1711                         if (how_indx < sizeof(asoc->cookie_how))
1712                                 asoc->cookie_how[how_indx] = 4;
1713                         return (NULL);
1714                 }
1715                 /* respond with a COOKIE-ACK */
1716                 sctp_toss_old_cookies(stcb, asoc);
1717                 sctp_send_cookie_ack(stcb);
1718                 if (how_indx < sizeof(asoc->cookie_how))
1719                         asoc->cookie_how[how_indx] = 5;
1720                 return (stcb);
1721         }
1722
1723         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1724             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1725             cookie->tie_tag_my_vtag == 0 &&
1726             cookie->tie_tag_peer_vtag == 0) {
1727                 /*
1728                  * case C in Section 5.2.4 Table 2: XMOO silently discard
1729                  */
1730                 if (how_indx < sizeof(asoc->cookie_how))
1731                         asoc->cookie_how[how_indx] = 6;
1732                 return (NULL);
1733         }
1734         /*
1735          * If nat support, and the below and stcb is established, send back
1736          * a ABORT(colliding state) if we are established.
1737          */
1738         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) &&
1739             (asoc->peer_supports_nat) &&
1740             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1741             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1742             (asoc->peer_vtag == 0)))) {
1743                 /*
1744                  * Special case - Peer's support nat. We may have two init's
1745                  * that we gave out the same tag on since one was not
1746                  * established.. i.e. we get INIT from host-1 behind the nat
1747                  * and we respond tag-a, we get a INIT from host-2 behind
1748                  * the nat and we get tag-a again. Then we bring up host-1
1749                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1750                  * Now we have colliding state. We must send an abort here
1751                  * with colliding state indication.
1752                  */
1753                 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, "");
1754                 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
1755                     mflowtype, mflowid, inp->fibnum,
1756                     vrf_id, port);
1757                 return (NULL);
1758         }
1759         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1760             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1761             (asoc->peer_vtag == 0))) {
1762                 /*
1763                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1764                  * should be ok, re-accept peer info
1765                  */
1766                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1767                         /*
1768                          * Extension of case C. If we hit this, then the
1769                          * random number generator returned the same vtag
1770                          * when we first sent our INIT-ACK and when we later
1771                          * sent our INIT. The side with the seq numbers that
1772                          * are different will be the one that normnally
1773                          * would have hit case C. This in effect "extends"
1774                          * our vtags in this collision case to be 64 bits.
1775                          * The same collision could occur aka you get both
1776                          * vtag and seq number the same twice in a row.. but
1777                          * is much less likely. If it did happen then we
1778                          * would proceed through and bring up the assoc.. we
1779                          * may end up with the wrong stream setup however..
1780                          * which would be bad.. but there is no way to
1781                          * tell.. until we send on a stream that does not
1782                          * exist :-)
1783                          */
1784                         if (how_indx < sizeof(asoc->cookie_how))
1785                                 asoc->cookie_how[how_indx] = 7;
1786
1787                         return (NULL);
1788                 }
1789                 if (how_indx < sizeof(asoc->cookie_how))
1790                         asoc->cookie_how[how_indx] = 8;
1791                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1792                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1793                 sctp_stop_all_cookie_timers(stcb);
1794                 /*
1795                  * since we did not send a HB make sure we don't double
1796                  * things
1797                  */
1798                 net->hb_responded = 1;
1799                 if (stcb->asoc.sctp_autoclose_ticks &&
1800                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1801                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1802                             NULL);
1803                 }
1804                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1805                 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1806
1807                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1808                         /*
1809                          * Ok the peer probably discarded our data (if we
1810                          * echoed a cookie+data). So anything on the
1811                          * sent_queue should be marked for retransmit, we
1812                          * may not get something to kick us so it COULD
1813                          * still take a timeout to move these.. but it can't
1814                          * hurt to mark them.
1815                          */
1816                         struct sctp_tmit_chunk *chk;
1817
1818                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1819                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1820                                         chk->sent = SCTP_DATAGRAM_RESEND;
1821                                         sctp_flight_size_decrease(chk);
1822                                         sctp_total_flight_decrease(stcb, chk);
1823                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1824                                         spec_flag++;
1825                                 }
1826                         }
1827
1828                 }
1829                 /* process the INIT info (peer's info) */
1830                 retval = sctp_process_init(init_cp, stcb);
1831                 if (retval < 0) {
1832                         if (how_indx < sizeof(asoc->cookie_how))
1833                                 asoc->cookie_how[how_indx] = 9;
1834                         return (NULL);
1835                 }
1836                 if (sctp_load_addresses_from_init(stcb, m,
1837                     init_offset + sizeof(struct sctp_init_chunk),
1838                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
1839                         if (how_indx < sizeof(asoc->cookie_how))
1840                                 asoc->cookie_how[how_indx] = 10;
1841                         return (NULL);
1842                 }
1843                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
1844                     (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
1845                         *notification = SCTP_NOTIFY_ASSOC_UP;
1846
1847                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1848                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1849                             (inp->sctp_socket->so_qlimit == 0)) {
1850 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1851                                 struct socket *so;
1852 #endif
1853                                 stcb->sctp_ep->sctp_flags |=
1854                                     SCTP_PCB_FLAGS_CONNECTED;
1855 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1856                                 so = SCTP_INP_SO(stcb->sctp_ep);
1857                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1858                                 SCTP_TCB_UNLOCK(stcb);
1859                                 SCTP_SOCKET_LOCK(so, 1);
1860                                 SCTP_TCB_LOCK(stcb);
1861                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1862                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1863                                         SCTP_SOCKET_UNLOCK(so, 1);
1864                                         return (NULL);
1865                                 }
1866 #endif
1867                                 soisconnected(stcb->sctp_socket);
1868 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1869                                 SCTP_SOCKET_UNLOCK(so, 1);
1870 #endif
1871                         }
1872                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)
1873                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1874                         else
1875                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1876                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1877                 } else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
1878                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1879                 } else {
1880                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1881                 }
1882                 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1883                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1884                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1885                             stcb->sctp_ep, stcb, asoc->primary_destination);
1886                 }
1887                 sctp_stop_all_cookie_timers(stcb);
1888                 sctp_toss_old_cookies(stcb, asoc);
1889                 sctp_send_cookie_ack(stcb);
1890                 if (spec_flag) {
1891                         /*
1892                          * only if we have retrans set do we do this. What
1893                          * this call does is get only the COOKIE-ACK out and
1894                          * then when we return the normal call to
1895                          * sctp_chunk_output will get the retrans out behind
1896                          * this.
1897                          */
1898                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1899                 }
1900                 if (how_indx < sizeof(asoc->cookie_how))
1901                         asoc->cookie_how[how_indx] = 11;
1902
1903                 return (stcb);
1904         }
1905         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1906             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1907             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1908             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1909             cookie->tie_tag_peer_vtag != 0) {
1910                 struct sctpasochead *head;
1911 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1912                 struct socket *so;
1913 #endif
1914
1915                 if (asoc->peer_supports_nat) {
1916                         /*
1917                          * This is a gross gross hack. Just call the
1918                          * cookie_new code since we are allowing a duplicate
1919                          * association. I hope this works...
1920                          */
1921                         return (sctp_process_cookie_new(m, iphlen, offset, src, dst,
1922                             sh, cookie, cookie_len,
1923                             inp, netp, init_src, notification,
1924                             auth_skipped, auth_offset, auth_len,
1925                             mflowtype, mflowid,
1926                             vrf_id, port));
1927                 }
1928                 /*
1929                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1930                  */
1931                 /* temp code */
1932                 if (how_indx < sizeof(asoc->cookie_how))
1933                         asoc->cookie_how[how_indx] = 12;
1934                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net,
1935                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1936                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1937                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
1938
1939                 /* notify upper layer */
1940                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1941                 atomic_add_int(&stcb->asoc.refcnt, 1);
1942                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) &&
1943                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1944                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) {
1945                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1946                 }
1947                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
1948                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1949                 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
1950                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1951                 }
1952                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1953                         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1954                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1955                             stcb->sctp_ep, stcb, asoc->primary_destination);
1956
1957                 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
1958                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1959                         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1960                 }
1961                 asoc->pre_open_streams =
1962                     ntohs(initack_cp->init.num_outbound_streams);
1963                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1964                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1965                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1966
1967                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1968
1969                 asoc->str_reset_seq_in = asoc->init_seq_number;
1970
1971                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1972                 if (asoc->mapping_array) {
1973                         memset(asoc->mapping_array, 0,
1974                             asoc->mapping_array_size);
1975                 }
1976                 if (asoc->nr_mapping_array) {
1977                         memset(asoc->nr_mapping_array, 0,
1978                             asoc->mapping_array_size);
1979                 }
1980                 SCTP_TCB_UNLOCK(stcb);
1981 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1982                 so = SCTP_INP_SO(stcb->sctp_ep);
1983                 SCTP_SOCKET_LOCK(so, 1);
1984 #endif
1985                 SCTP_INP_INFO_WLOCK();
1986                 SCTP_INP_WLOCK(stcb->sctp_ep);
1987                 SCTP_TCB_LOCK(stcb);
1988                 atomic_add_int(&stcb->asoc.refcnt, -1);
1989                 /* send up all the data */
1990                 SCTP_TCB_SEND_LOCK(stcb);
1991
1992                 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED);
1993                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1994                         stcb->asoc.strmout[i].chunks_on_queues = 0;
1995 #if defined(SCTP_DETAILED_STR_STATS)
1996                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
1997                                 asoc->strmout[i].abandoned_sent[j] = 0;
1998                                 asoc->strmout[i].abandoned_unsent[j] = 0;
1999                         }
2000 #else
2001                         asoc->strmout[i].abandoned_sent[0] = 0;
2002                         asoc->strmout[i].abandoned_unsent[0] = 0;
2003 #endif
2004                         stcb->asoc.strmout[i].sid = i;
2005                         stcb->asoc.strmout[i].next_mid_ordered = 0;
2006                         stcb->asoc.strmout[i].next_mid_unordered = 0;
2007                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
2008                 }
2009                 /* process the INIT-ACK info (my info) */
2010                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2011                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2012
2013                 /* pull from vtag hash */
2014                 LIST_REMOVE(stcb, sctp_asocs);
2015                 /* re-insert to new vtag position */
2016                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
2017                     SCTP_BASE_INFO(hashasocmark))];
2018                 /*
2019                  * put it in the bucket in the vtag hash of assoc's for the
2020                  * system
2021                  */
2022                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
2023
2024                 SCTP_TCB_SEND_UNLOCK(stcb);
2025                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
2026                 SCTP_INP_INFO_WUNLOCK();
2027 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2028                 SCTP_SOCKET_UNLOCK(so, 1);
2029 #endif
2030                 asoc->total_flight = 0;
2031                 asoc->total_flight_count = 0;
2032                 /* process the INIT info (peer's info) */
2033                 retval = sctp_process_init(init_cp, stcb);
2034                 if (retval < 0) {
2035                         if (how_indx < sizeof(asoc->cookie_how))
2036                                 asoc->cookie_how[how_indx] = 13;
2037
2038                         return (NULL);
2039                 }
2040                 /*
2041                  * since we did not send a HB make sure we don't double
2042                  * things
2043                  */
2044                 net->hb_responded = 1;
2045
2046                 if (sctp_load_addresses_from_init(stcb, m,
2047                     init_offset + sizeof(struct sctp_init_chunk),
2048                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
2049                         if (how_indx < sizeof(asoc->cookie_how))
2050                                 asoc->cookie_how[how_indx] = 14;
2051
2052                         return (NULL);
2053                 }
2054                 /* respond with a COOKIE-ACK */
2055                 sctp_stop_all_cookie_timers(stcb);
2056                 sctp_toss_old_cookies(stcb, asoc);
2057                 sctp_send_cookie_ack(stcb);
2058                 if (how_indx < sizeof(asoc->cookie_how))
2059                         asoc->cookie_how[how_indx] = 15;
2060
2061                 return (stcb);
2062         }
2063         if (how_indx < sizeof(asoc->cookie_how))
2064                 asoc->cookie_how[how_indx] = 16;
2065         /* all other cases... */
2066         return (NULL);
2067 }
2068
2069
2070 /*
2071  * handle a state cookie for a new association m: input packet mbuf chain--
2072  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
2073  * and the cookie signature does not exist offset: offset into mbuf to the
2074  * cookie-echo chunk length: length of the cookie chunk to: where the init
2075  * was from returns a new TCB
2076  */
2077 static struct sctp_tcb *
2078 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
2079     struct sockaddr *src, struct sockaddr *dst,
2080     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
2081     struct sctp_inpcb *inp, struct sctp_nets **netp,
2082     struct sockaddr *init_src, int *notification,
2083     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2084     uint8_t mflowtype, uint32_t mflowid,
2085     uint32_t vrf_id, uint16_t port)
2086 {
2087         struct sctp_tcb *stcb;
2088         struct sctp_init_chunk *init_cp, init_buf;
2089         struct sctp_init_ack_chunk *initack_cp, initack_buf;
2090         union sctp_sockstore store;
2091         struct sctp_association *asoc;
2092         int init_offset, initack_offset, initack_limit;
2093         int retval;
2094         int error = 0;
2095         uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
2096 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2097         struct socket *so;
2098
2099         so = SCTP_INP_SO(inp);
2100 #endif
2101
2102         /*
2103          * find and validate the INIT chunk in the cookie (peer's info) the
2104          * INIT should start after the cookie-echo header struct (chunk
2105          * header, state cookie header struct)
2106          */
2107         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
2108         init_cp = (struct sctp_init_chunk *)
2109             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
2110             (uint8_t *)&init_buf);
2111         if (init_cp == NULL) {
2112                 /* could not pull a INIT chunk in cookie */
2113                 SCTPDBG(SCTP_DEBUG_INPUT1,
2114                     "process_cookie_new: could not pull INIT chunk hdr\n");
2115                 return (NULL);
2116         }
2117         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
2118                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
2119                 return (NULL);
2120         }
2121         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
2122         /*
2123          * find and validate the INIT-ACK chunk in the cookie (my info) the
2124          * INIT-ACK follows the INIT chunk
2125          */
2126         initack_cp = (struct sctp_init_ack_chunk *)
2127             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
2128             (uint8_t *)&initack_buf);
2129         if (initack_cp == NULL) {
2130                 /* could not pull INIT-ACK chunk in cookie */
2131                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2132                 return (NULL);
2133         }
2134         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2135                 return (NULL);
2136         }
2137         /*
2138          * NOTE: We can't use the INIT_ACK's chk_length to determine the
2139          * "initack_limit" value.  This is because the chk_length field
2140          * includes the length of the cookie, but the cookie is omitted when
2141          * the INIT and INIT_ACK are tacked onto the cookie...
2142          */
2143         initack_limit = offset + cookie_len;
2144
2145         /*
2146          * now that we know the INIT/INIT-ACK are in place, create a new TCB
2147          * and popluate
2148          */
2149
2150         /*
2151          * Here we do a trick, we set in NULL for the proc/thread argument.
2152          * We do this since in effect we only use the p argument when the
2153          * socket is unbound and we must do an implicit bind. Since we are
2154          * getting a cookie, we cannot be unbound.
2155          */
2156         stcb = sctp_aloc_assoc(inp, init_src, &error,
2157             ntohl(initack_cp->init.initiate_tag), vrf_id,
2158             ntohs(initack_cp->init.num_outbound_streams),
2159             port,
2160             (struct thread *)NULL
2161             );
2162         if (stcb == NULL) {
2163                 struct mbuf *op_err;
2164
2165                 /* memory problem? */
2166                 SCTPDBG(SCTP_DEBUG_INPUT1,
2167                     "process_cookie_new: no room for another TCB!\n");
2168                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2169                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2170                     src, dst, sh, op_err,
2171                     mflowtype, mflowid,
2172                     vrf_id, port);
2173                 return (NULL);
2174         }
2175         /* get the correct sctp_nets */
2176         if (netp)
2177                 *netp = sctp_findnet(stcb, init_src);
2178
2179         asoc = &stcb->asoc;
2180         /* get scope variables out of cookie */
2181         asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
2182         asoc->scope.site_scope = cookie->site_scope;
2183         asoc->scope.local_scope = cookie->local_scope;
2184         asoc->scope.loopback_scope = cookie->loopback_scope;
2185
2186         if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2187             (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2188                 struct mbuf *op_err;
2189
2190                 /*
2191                  * Houston we have a problem. The EP changed while the
2192                  * cookie was in flight. Only recourse is to abort the
2193                  * association.
2194                  */
2195                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2196                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2197                     src, dst, sh, op_err,
2198                     mflowtype, mflowid,
2199                     vrf_id, port);
2200 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2201                 atomic_add_int(&stcb->asoc.refcnt, 1);
2202                 SCTP_TCB_UNLOCK(stcb);
2203                 SCTP_SOCKET_LOCK(so, 1);
2204                 SCTP_TCB_LOCK(stcb);
2205                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2206 #endif
2207                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2208                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2209 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2210                 SCTP_SOCKET_UNLOCK(so, 1);
2211 #endif
2212                 return (NULL);
2213         }
2214         /* process the INIT-ACK info (my info) */
2215         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2216         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2217         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2218         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2219         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2220         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2221         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2222         asoc->str_reset_seq_in = asoc->init_seq_number;
2223
2224         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2225
2226         /* process the INIT info (peer's info) */
2227         if (netp)
2228                 retval = sctp_process_init(init_cp, stcb);
2229         else
2230                 retval = 0;
2231         if (retval < 0) {
2232 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2233                 atomic_add_int(&stcb->asoc.refcnt, 1);
2234                 SCTP_TCB_UNLOCK(stcb);
2235                 SCTP_SOCKET_LOCK(so, 1);
2236                 SCTP_TCB_LOCK(stcb);
2237                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2238 #endif
2239                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2240                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2241 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2242                 SCTP_SOCKET_UNLOCK(so, 1);
2243 #endif
2244                 return (NULL);
2245         }
2246         /* load all addresses */
2247         if (sctp_load_addresses_from_init(stcb, m,
2248             init_offset + sizeof(struct sctp_init_chunk), initack_offset,
2249             src, dst, init_src, port)) {
2250 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2251                 atomic_add_int(&stcb->asoc.refcnt, 1);
2252                 SCTP_TCB_UNLOCK(stcb);
2253                 SCTP_SOCKET_LOCK(so, 1);
2254                 SCTP_TCB_LOCK(stcb);
2255                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2256 #endif
2257                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2258                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2259 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2260                 SCTP_SOCKET_UNLOCK(so, 1);
2261 #endif
2262                 return (NULL);
2263         }
2264         /*
2265          * verify any preceding AUTH chunk that was skipped
2266          */
2267         /* pull the local authentication parameters from the cookie/init-ack */
2268         sctp_auth_get_cookie_params(stcb, m,
2269             initack_offset + sizeof(struct sctp_init_ack_chunk),
2270             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2271         if (auth_skipped) {
2272                 struct sctp_auth_chunk *auth;
2273
2274                 auth = (struct sctp_auth_chunk *)
2275                     sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2276                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2277                         /* auth HMAC failed, dump the assoc and packet */
2278                         SCTPDBG(SCTP_DEBUG_AUTH1,
2279                             "COOKIE-ECHO: AUTH failed\n");
2280 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2281                         atomic_add_int(&stcb->asoc.refcnt, 1);
2282                         SCTP_TCB_UNLOCK(stcb);
2283                         SCTP_SOCKET_LOCK(so, 1);
2284                         SCTP_TCB_LOCK(stcb);
2285                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2286 #endif
2287                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2288                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_21);
2289 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2290                         SCTP_SOCKET_UNLOCK(so, 1);
2291 #endif
2292                         return (NULL);
2293                 } else {
2294                         /* remaining chunks checked... good to go */
2295                         stcb->asoc.authenticated = 1;
2296                 }
2297         }
2298
2299         /*
2300          * if we're doing ASCONFs, check to see if we have any new local
2301          * addresses that need to get added to the peer (eg. addresses
2302          * changed while cookie echo in flight).  This needs to be done
2303          * after we go to the OPEN state to do the correct asconf
2304          * processing. else, make sure we have the correct addresses in our
2305          * lists
2306          */
2307
2308         /* warning, we re-use sin, sin6, sa_store here! */
2309         /* pull in local_address (our "from" address) */
2310         switch (cookie->laddr_type) {
2311 #ifdef INET
2312         case SCTP_IPV4_ADDRESS:
2313                 /* source addr is IPv4 */
2314                 memset(&store.sin, 0, sizeof(struct sockaddr_in));
2315                 store.sin.sin_family = AF_INET;
2316                 store.sin.sin_len = sizeof(struct sockaddr_in);
2317                 store.sin.sin_addr.s_addr = cookie->laddress[0];
2318                 break;
2319 #endif
2320 #ifdef INET6
2321         case SCTP_IPV6_ADDRESS:
2322                 /* source addr is IPv6 */
2323                 memset(&store.sin6, 0, sizeof(struct sockaddr_in6));
2324                 store.sin6.sin6_family = AF_INET6;
2325                 store.sin6.sin6_len = sizeof(struct sockaddr_in6);
2326                 store.sin6.sin6_scope_id = cookie->scope_id;
2327                 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr));
2328                 break;
2329 #endif
2330         default:
2331 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2332                 atomic_add_int(&stcb->asoc.refcnt, 1);
2333                 SCTP_TCB_UNLOCK(stcb);
2334                 SCTP_SOCKET_LOCK(so, 1);
2335                 SCTP_TCB_LOCK(stcb);
2336                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2337 #endif
2338                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2339                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
2340 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2341                 SCTP_SOCKET_UNLOCK(so, 1);
2342 #endif
2343                 return (NULL);
2344         }
2345
2346         /* update current state */
2347         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2348         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
2349         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2350                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2351                     stcb->sctp_ep, stcb, asoc->primary_destination);
2352         }
2353         sctp_stop_all_cookie_timers(stcb);
2354         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2355         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2356
2357         /* set up to notify upper layer */
2358         *notification = SCTP_NOTIFY_ASSOC_UP;
2359         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2360             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2361             (inp->sctp_socket->so_qlimit == 0)) {
2362                 /*
2363                  * This is an endpoint that called connect() how it got a
2364                  * cookie that is NEW is a bit of a mystery. It must be that
2365                  * the INIT was sent, but before it got there.. a complete
2366                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2367                  * should have went to the other code.. not here.. oh well..
2368                  * a bit of protection is worth having..
2369                  */
2370                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2371 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2372                 atomic_add_int(&stcb->asoc.refcnt, 1);
2373                 SCTP_TCB_UNLOCK(stcb);
2374                 SCTP_SOCKET_LOCK(so, 1);
2375                 SCTP_TCB_LOCK(stcb);
2376                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2377                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2378                         SCTP_SOCKET_UNLOCK(so, 1);
2379                         return (NULL);
2380                 }
2381 #endif
2382                 soisconnected(stcb->sctp_socket);
2383 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2384                 SCTP_SOCKET_UNLOCK(so, 1);
2385 #endif
2386         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2387             (inp->sctp_socket->so_qlimit)) {
2388                 /*
2389                  * We don't want to do anything with this one. Since it is
2390                  * the listening guy. The timer will get started for
2391                  * accepted connections in the caller.
2392                  */
2393                 ;
2394         }
2395         /* since we did not send a HB make sure we don't double things */
2396         if ((netp) && (*netp))
2397                 (*netp)->hb_responded = 1;
2398
2399         if (stcb->asoc.sctp_autoclose_ticks &&
2400             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2401                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2402         }
2403         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2404         if ((netp != NULL) && (*netp != NULL)) {
2405                 struct timeval old;
2406
2407                 /* calculate the RTT and set the encaps port */
2408                 old.tv_sec = cookie->time_entered.tv_sec;
2409                 old.tv_usec = cookie->time_entered.tv_usec;
2410                 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
2411                     &old, SCTP_RTT_FROM_NON_DATA);
2412         }
2413         /* respond with a COOKIE-ACK */
2414         sctp_send_cookie_ack(stcb);
2415
2416         /*
2417          * check the address lists for any ASCONFs that need to be sent
2418          * AFTER the cookie-ack is sent
2419          */
2420         sctp_check_address_list(stcb, m,
2421             initack_offset + sizeof(struct sctp_init_ack_chunk),
2422             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2423             &store.sa, cookie->local_scope, cookie->site_scope,
2424             cookie->ipv4_scope, cookie->loopback_scope);
2425
2426
2427         return (stcb);
2428 }
2429
2430 /*
2431  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2432  * we NEED to make sure we are not already using the vtag. If so we
2433  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2434         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2435                                                             SCTP_BASE_INFO(hashasocmark))];
2436         LIST_FOREACH(stcb, head, sctp_asocs) {
2437                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2438                        -- SEND ABORT - TRY AGAIN --
2439                 }
2440         }
2441 */
2442
2443 /*
2444  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2445  * existing (non-NULL) TCB
2446  */
2447 static struct mbuf *
2448 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2449     struct sockaddr *src, struct sockaddr *dst,
2450     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2451     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2452     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2453     struct sctp_tcb **locked_tcb,
2454     uint8_t mflowtype, uint32_t mflowid,
2455     uint32_t vrf_id, uint16_t port)
2456 {
2457         struct sctp_state_cookie *cookie;
2458         struct sctp_tcb *l_stcb = *stcb;
2459         struct sctp_inpcb *l_inp;
2460         struct sockaddr *to;
2461         struct sctp_pcb *ep;
2462         struct mbuf *m_sig;
2463         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2464         uint8_t *sig;
2465         uint8_t cookie_ok = 0;
2466         unsigned int sig_offset, cookie_offset;
2467         unsigned int cookie_len;
2468         struct timeval now;
2469         struct timeval time_expires;
2470         int notification = 0;
2471         struct sctp_nets *netl;
2472         int had_a_existing_tcb = 0;
2473         int send_int_conf = 0;
2474 #ifdef INET
2475         struct sockaddr_in sin;
2476 #endif
2477 #ifdef INET6
2478         struct sockaddr_in6 sin6;
2479 #endif
2480
2481         SCTPDBG(SCTP_DEBUG_INPUT2,
2482             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2483
2484         if (inp_p == NULL) {
2485                 return (NULL);
2486         }
2487         cookie = &cp->cookie;
2488         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2489         cookie_len = ntohs(cp->ch.chunk_length);
2490
2491         if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2492             sizeof(struct sctp_init_chunk) +
2493             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2494                 /* cookie too small */
2495                 return (NULL);
2496         }
2497         if ((cookie->peerport != sh->src_port) ||
2498             (cookie->myport != sh->dest_port) ||
2499             (cookie->my_vtag != sh->v_tag)) {
2500                 /*
2501                  * invalid ports or bad tag.  Note that we always leave the
2502                  * v_tag in the header in network order and when we stored
2503                  * it in the my_vtag slot we also left it in network order.
2504                  * This maintains the match even though it may be in the
2505                  * opposite byte order of the machine :->
2506                  */
2507                 return (NULL);
2508         }
2509         /*
2510          * split off the signature into its own mbuf (since it should not be
2511          * calculated in the sctp_hmac_m() call).
2512          */
2513         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2514         m_sig = m_split(m, sig_offset, M_NOWAIT);
2515         if (m_sig == NULL) {
2516                 /* out of memory or ?? */
2517                 return (NULL);
2518         }
2519 #ifdef SCTP_MBUF_LOGGING
2520         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2521                 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT);
2522         }
2523 #endif
2524
2525         /*
2526          * compute the signature/digest for the cookie
2527          */
2528         ep = &(*inp_p)->sctp_ep;
2529         l_inp = *inp_p;
2530         if (l_stcb) {
2531                 SCTP_TCB_UNLOCK(l_stcb);
2532         }
2533         SCTP_INP_RLOCK(l_inp);
2534         if (l_stcb) {
2535                 SCTP_TCB_LOCK(l_stcb);
2536         }
2537         /* which cookie is it? */
2538         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2539             (ep->current_secret_number != ep->last_secret_number)) {
2540                 /* it's the old cookie */
2541                 (void)sctp_hmac_m(SCTP_HMAC,
2542                     (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2543                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2544         } else {
2545                 /* it's the current cookie */
2546                 (void)sctp_hmac_m(SCTP_HMAC,
2547                     (uint8_t *)ep->secret_key[(int)ep->current_secret_number],
2548                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2549         }
2550         /* get the signature */
2551         SCTP_INP_RUNLOCK(l_inp);
2552         sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig);
2553         if (sig == NULL) {
2554                 /* couldn't find signature */
2555                 sctp_m_freem(m_sig);
2556                 return (NULL);
2557         }
2558         /* compare the received digest with the computed digest */
2559         if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2560                 /* try the old cookie? */
2561                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2562                     (ep->current_secret_number != ep->last_secret_number)) {
2563                         /* compute digest with old */
2564                         (void)sctp_hmac_m(SCTP_HMAC,
2565                             (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2566                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2567                         /* compare */
2568                         if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2569                                 cookie_ok = 1;
2570                 }
2571         } else {
2572                 cookie_ok = 1;
2573         }
2574
2575         /*
2576          * Now before we continue we must reconstruct our mbuf so that
2577          * normal processing of any other chunks will work.
2578          */
2579         {
2580                 struct mbuf *m_at;
2581
2582                 m_at = m;
2583                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2584                         m_at = SCTP_BUF_NEXT(m_at);
2585                 }
2586                 SCTP_BUF_NEXT(m_at) = m_sig;
2587         }
2588
2589         if (cookie_ok == 0) {
2590                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2591                 SCTPDBG(SCTP_DEBUG_INPUT2,
2592                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2593                     (uint32_t)offset, cookie_offset, sig_offset);
2594                 return (NULL);
2595         }
2596
2597         /*
2598          * check the cookie timestamps to be sure it's not stale
2599          */
2600         (void)SCTP_GETTIME_TIMEVAL(&now);
2601         /* Expire time is in Ticks, so we convert to seconds */
2602         time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
2603         time_expires.tv_usec = cookie->time_entered.tv_usec;
2604         if (timevalcmp(&now, &time_expires, >)) {
2605                 /* cookie is stale! */
2606                 struct mbuf *op_err;
2607                 struct sctp_error_stale_cookie *cause;
2608                 struct timeval diff;
2609                 uint32_t staleness;
2610
2611                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie),
2612                     0, M_NOWAIT, 1, MT_DATA);
2613                 if (op_err == NULL) {
2614                         /* FOOBAR */
2615                         return (NULL);
2616                 }
2617                 /* Set the len */
2618                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie);
2619                 cause = mtod(op_err, struct sctp_error_stale_cookie *);
2620                 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE);
2621                 cause->cause.length = htons((sizeof(struct sctp_paramhdr) +
2622                     (sizeof(uint32_t))));
2623                 diff = now;
2624                 timevalsub(&diff, &time_expires);
2625                 if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) {
2626                         staleness = UINT32_MAX;
2627                 } else {
2628                         staleness = diff.tv_sec * 1000000;
2629                 }
2630                 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) {
2631                         staleness += diff.tv_usec;
2632                 } else {
2633                         staleness = UINT32_MAX;
2634                 }
2635                 cause->stale_time = htonl(staleness);
2636                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
2637                     mflowtype, mflowid, l_inp->fibnum,
2638                     vrf_id, port);
2639                 return (NULL);
2640         }
2641         /*
2642          * Now we must see with the lookup address if we have an existing
2643          * asoc. This will only happen if we were in the COOKIE-WAIT state
2644          * and a INIT collided with us and somewhere the peer sent the
2645          * cookie on another address besides the single address our assoc
2646          * had for him. In this case we will have one of the tie-tags set at
2647          * least AND the address field in the cookie can be used to look it
2648          * up.
2649          */
2650         to = NULL;
2651         switch (cookie->addr_type) {
2652 #ifdef INET6
2653         case SCTP_IPV6_ADDRESS:
2654                 memset(&sin6, 0, sizeof(sin6));
2655                 sin6.sin6_family = AF_INET6;
2656                 sin6.sin6_len = sizeof(sin6);
2657                 sin6.sin6_port = sh->src_port;
2658                 sin6.sin6_scope_id = cookie->scope_id;
2659                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2660                     sizeof(sin6.sin6_addr.s6_addr));
2661                 to = (struct sockaddr *)&sin6;
2662                 break;
2663 #endif
2664 #ifdef INET
2665         case SCTP_IPV4_ADDRESS:
2666                 memset(&sin, 0, sizeof(sin));
2667                 sin.sin_family = AF_INET;
2668                 sin.sin_len = sizeof(sin);
2669                 sin.sin_port = sh->src_port;
2670                 sin.sin_addr.s_addr = cookie->address[0];
2671                 to = (struct sockaddr *)&sin;
2672                 break;
2673 #endif
2674         default:
2675                 /* This should not happen */
2676                 return (NULL);
2677         }
2678         if (*stcb == NULL) {
2679                 /* Yep, lets check */
2680                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
2681                 if (*stcb == NULL) {
2682                         /*
2683                          * We should have only got back the same inp. If we
2684                          * got back a different ep we have a problem. The
2685                          * original findep got back l_inp and now
2686                          */
2687                         if (l_inp != *inp_p) {
2688                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2689                         }
2690                 } else {
2691                         if (*locked_tcb == NULL) {
2692                                 /*
2693                                  * In this case we found the assoc only
2694                                  * after we locked the create lock. This
2695                                  * means we are in a colliding case and we
2696                                  * must make sure that we unlock the tcb if
2697                                  * its one of the cases where we throw away
2698                                  * the incoming packets.
2699                                  */
2700                                 *locked_tcb = *stcb;
2701
2702                                 /*
2703                                  * We must also increment the inp ref count
2704                                  * since the ref_count flags was set when we
2705                                  * did not find the TCB, now we found it
2706                                  * which reduces the refcount.. we must
2707                                  * raise it back out to balance it all :-)
2708                                  */
2709                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2710                                 if ((*stcb)->sctp_ep != l_inp) {
2711                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2712                                             (void *)(*stcb)->sctp_ep, (void *)l_inp);
2713                                 }
2714                         }
2715                 }
2716         }
2717
2718         cookie_len -= SCTP_SIGNATURE_SIZE;
2719         if (*stcb == NULL) {
2720                 /* this is the "normal" case... get a new TCB */
2721                 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
2722                     cookie, cookie_len, *inp_p,
2723                     netp, to, &notification,
2724                     auth_skipped, auth_offset, auth_len,
2725                     mflowtype, mflowid,
2726                     vrf_id, port);
2727         } else {
2728                 /* this is abnormal... cookie-echo on existing TCB */
2729                 had_a_existing_tcb = 1;
2730                 *stcb = sctp_process_cookie_existing(m, iphlen, offset,
2731                     src, dst, sh,
2732                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2733                     &notification, auth_skipped, auth_offset, auth_len,
2734                     mflowtype, mflowid,
2735                     vrf_id, port);
2736         }
2737
2738         if (*stcb == NULL) {
2739                 /* still no TCB... must be bad cookie-echo */
2740                 return (NULL);
2741         }
2742         if (*netp != NULL) {
2743                 (*netp)->flowtype = mflowtype;
2744                 (*netp)->flowid = mflowid;
2745         }
2746         /*
2747          * Ok, we built an association so confirm the address we sent the
2748          * INIT-ACK to.
2749          */
2750         netl = sctp_findnet(*stcb, to);
2751         /*
2752          * This code should in theory NOT run but
2753          */
2754         if (netl == NULL) {
2755                 /* TSNH! Huh, why do I need to add this address here? */
2756                 if (sctp_add_remote_addr(*stcb, to, NULL, port,
2757                     SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2758                         return (NULL);
2759                 }
2760                 netl = sctp_findnet(*stcb, to);
2761         }
2762         if (netl) {
2763                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2764                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2765                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2766                             netl);
2767                         send_int_conf = 1;
2768                 }
2769         }
2770         sctp_start_net_timers(*stcb);
2771         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2772                 if (!had_a_existing_tcb ||
2773                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2774                         /*
2775                          * If we have a NEW cookie or the connect never
2776                          * reached the connected state during collision we
2777                          * must do the TCP accept thing.
2778                          */
2779                         struct socket *so, *oso;
2780                         struct sctp_inpcb *inp;
2781
2782                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2783                                 /*
2784                                  * For a restart we will keep the same
2785                                  * socket, no need to do anything. I THINK!!
2786                                  */
2787                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2788                                 if (send_int_conf) {
2789                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2790                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2791                                 }
2792                                 return (m);
2793                         }
2794                         oso = (*inp_p)->sctp_socket;
2795                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2796                         SCTP_TCB_UNLOCK((*stcb));
2797                         CURVNET_SET(oso->so_vnet);
2798                         so = sonewconn(oso, 0
2799                             );
2800                         CURVNET_RESTORE();
2801                         SCTP_TCB_LOCK((*stcb));
2802                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2803
2804                         if (so == NULL) {
2805                                 struct mbuf *op_err;
2806 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2807                                 struct socket *pcb_so;
2808 #endif
2809                                 /* Too many sockets */
2810                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2811                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2812                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2813                                     src, dst, sh, op_err,
2814                                     mflowtype, mflowid,
2815                                     vrf_id, port);
2816 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2817                                 pcb_so = SCTP_INP_SO(*inp_p);
2818                                 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2819                                 SCTP_TCB_UNLOCK((*stcb));
2820                                 SCTP_SOCKET_LOCK(pcb_so, 1);
2821                                 SCTP_TCB_LOCK((*stcb));
2822                                 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2823 #endif
2824                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC,
2825                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
2826 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2827                                 SCTP_SOCKET_UNLOCK(pcb_so, 1);
2828 #endif
2829                                 return (NULL);
2830                         }
2831                         inp = (struct sctp_inpcb *)so->so_pcb;
2832                         SCTP_INP_INCR_REF(inp);
2833                         /*
2834                          * We add the unbound flag here so that if we get an
2835                          * soabort() before we get the move_pcb done, we
2836                          * will properly cleanup.
2837                          */
2838                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2839                             SCTP_PCB_FLAGS_CONNECTED |
2840                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2841                             SCTP_PCB_FLAGS_UNBOUND |
2842                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2843                             SCTP_PCB_FLAGS_DONT_WAKE);
2844                         inp->sctp_features = (*inp_p)->sctp_features;
2845                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2846                         inp->sctp_socket = so;
2847                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2848                         inp->max_cwnd = (*inp_p)->max_cwnd;
2849                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2850                         inp->ecn_supported = (*inp_p)->ecn_supported;
2851                         inp->prsctp_supported = (*inp_p)->prsctp_supported;
2852                         inp->auth_supported = (*inp_p)->auth_supported;
2853                         inp->asconf_supported = (*inp_p)->asconf_supported;
2854                         inp->reconfig_supported = (*inp_p)->reconfig_supported;
2855                         inp->nrsack_supported = (*inp_p)->nrsack_supported;
2856                         inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
2857                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2858                         inp->sctp_context = (*inp_p)->sctp_context;
2859                         inp->local_strreset_support = (*inp_p)->local_strreset_support;
2860                         inp->fibnum = (*inp_p)->fibnum;
2861                         inp->inp_starting_point_for_iterator = NULL;
2862                         /*
2863                          * copy in the authentication parameters from the
2864                          * original endpoint
2865                          */
2866                         if (inp->sctp_ep.local_hmacs)
2867                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2868                         inp->sctp_ep.local_hmacs =
2869                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2870                         if (inp->sctp_ep.local_auth_chunks)
2871                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2872                         inp->sctp_ep.local_auth_chunks =
2873                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2874
2875                         /*
2876                          * Now we must move it from one hash table to
2877                          * another and get the tcb in the right place.
2878                          */
2879
2880                         /*
2881                          * This is where the one-2-one socket is put into
2882                          * the accept state waiting for the accept!
2883                          */
2884                         if (*stcb) {
2885                                 SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE);
2886                         }
2887                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2888
2889                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2890                         SCTP_TCB_UNLOCK((*stcb));
2891
2892                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2893                             0);
2894                         SCTP_TCB_LOCK((*stcb));
2895                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2896
2897
2898                         /*
2899                          * now we must check to see if we were aborted while
2900                          * the move was going on and the lock/unlock
2901                          * happened.
2902                          */
2903                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2904                                 /*
2905                                  * yep it was, we leave the assoc attached
2906                                  * to the socket since the sctp_inpcb_free()
2907                                  * call will send an abort for us.
2908                                  */
2909                                 SCTP_INP_DECR_REF(inp);
2910                                 return (NULL);
2911                         }
2912                         SCTP_INP_DECR_REF(inp);
2913                         /* Switch over to the new guy */
2914                         *inp_p = inp;
2915                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2916                         if (send_int_conf) {
2917                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2918                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2919                         }
2920
2921                         /*
2922                          * Pull it from the incomplete queue and wake the
2923                          * guy
2924                          */
2925 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2926                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2927                         SCTP_TCB_UNLOCK((*stcb));
2928                         SCTP_SOCKET_LOCK(so, 1);
2929 #endif
2930                         soisconnected(so);
2931 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2932                         SCTP_TCB_LOCK((*stcb));
2933                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2934                         SCTP_SOCKET_UNLOCK(so, 1);
2935 #endif
2936                         return (m);
2937                 }
2938         }
2939         if (notification) {
2940                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2941         }
2942         if (send_int_conf) {
2943                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2944                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2945         }
2946         return (m);
2947 }
2948
2949 static void
2950 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2951     struct sctp_tcb *stcb, struct sctp_nets *net)
2952 {
2953         /* cp must not be used, others call this without a c-ack :-) */
2954         struct sctp_association *asoc;
2955
2956         SCTPDBG(SCTP_DEBUG_INPUT2,
2957             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2958         if ((stcb == NULL) || (net == NULL)) {
2959                 return;
2960         }
2961
2962         asoc = &stcb->asoc;
2963         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
2964                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
2965                     asoc->overall_error_count,
2966                     0,
2967                     SCTP_FROM_SCTP_INPUT,
2968                     __LINE__);
2969         }
2970         asoc->overall_error_count = 0;
2971         sctp_stop_all_cookie_timers(stcb);
2972         /* process according to association state */
2973         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) {
2974                 /* state change only needed when I am in right state */
2975                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2976                 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
2977                 sctp_start_net_timers(stcb);
2978                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2979                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2980                             stcb->sctp_ep, stcb, asoc->primary_destination);
2981
2982                 }
2983                 /* update RTO */
2984                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2985                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2986                 if (asoc->overall_error_count == 0) {
2987                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
2988                             &asoc->time_entered,
2989                             SCTP_RTT_FROM_NON_DATA);
2990                 }
2991                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2992                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2993                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2994                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2995 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2996                         struct socket *so;
2997
2998 #endif
2999                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
3000 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3001                         so = SCTP_INP_SO(stcb->sctp_ep);
3002                         atomic_add_int(&stcb->asoc.refcnt, 1);
3003                         SCTP_TCB_UNLOCK(stcb);
3004                         SCTP_SOCKET_LOCK(so, 1);
3005                         SCTP_TCB_LOCK(stcb);
3006                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3007 #endif
3008                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
3009                                 soisconnected(stcb->sctp_socket);
3010                         }
3011 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3012                         SCTP_SOCKET_UNLOCK(so, 1);
3013 #endif
3014                 }
3015                 /*
3016                  * since we did not send a HB make sure we don't double
3017                  * things
3018                  */
3019                 net->hb_responded = 1;
3020
3021                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
3022                         /*
3023                          * We don't need to do the asconf thing, nor hb or
3024                          * autoclose if the socket is closed.
3025                          */
3026                         goto closed_socket;
3027                 }
3028
3029                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
3030                     stcb, net);
3031
3032
3033                 if (stcb->asoc.sctp_autoclose_ticks &&
3034                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
3035                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
3036                             stcb->sctp_ep, stcb, NULL);
3037                 }
3038                 /*
3039                  * send ASCONF if parameters are pending and ASCONFs are
3040                  * allowed (eg. addresses changed when init/cookie echo were
3041                  * in flight)
3042                  */
3043                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
3044                     (stcb->asoc.asconf_supported == 1) &&
3045                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
3046 #ifdef SCTP_TIMER_BASED_ASCONF
3047                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
3048                             stcb->sctp_ep, stcb,
3049                             stcb->asoc.primary_destination);
3050 #else
3051                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
3052                             SCTP_ADDR_NOT_LOCKED);
3053 #endif
3054                 }
3055         }
3056 closed_socket:
3057         /* Toss the cookie if I can */
3058         sctp_toss_old_cookies(stcb, asoc);
3059         if (!TAILQ_EMPTY(&asoc->sent_queue)) {
3060                 /* Restart the timer if we have pending data */
3061                 struct sctp_tmit_chunk *chk;
3062
3063                 chk = TAILQ_FIRST(&asoc->sent_queue);
3064                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
3065         }
3066 }
3067
3068 static void
3069 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
3070     struct sctp_tcb *stcb)
3071 {
3072         struct sctp_nets *net;
3073         struct sctp_tmit_chunk *lchk;
3074         struct sctp_ecne_chunk bkup;
3075         uint8_t override_bit;
3076         uint32_t tsn, window_data_tsn;
3077         int len;
3078         unsigned int pkt_cnt;
3079
3080         len = ntohs(cp->ch.chunk_length);
3081         if ((len != sizeof(struct sctp_ecne_chunk)) &&
3082             (len != sizeof(struct old_sctp_ecne_chunk))) {
3083                 return;
3084         }
3085         if (len == sizeof(struct old_sctp_ecne_chunk)) {
3086                 /* Its the old format */
3087                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
3088                 bkup.num_pkts_since_cwr = htonl(1);
3089                 cp = &bkup;
3090         }
3091         SCTP_STAT_INCR(sctps_recvecne);
3092         tsn = ntohl(cp->tsn);
3093         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
3094         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
3095         if (lchk == NULL) {
3096                 window_data_tsn = stcb->asoc.sending_seq - 1;
3097         } else {
3098                 window_data_tsn = lchk->rec.data.tsn;
3099         }
3100
3101         /* Find where it was sent to if possible. */
3102         net = NULL;
3103         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
3104                 if (lchk->rec.data.tsn == tsn) {
3105                         net = lchk->whoTo;
3106                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
3107                         break;
3108                 }
3109                 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) {
3110                         break;
3111                 }
3112         }
3113         if (net == NULL) {
3114                 /*
3115                  * What to do. A previous send of a CWR was possibly lost.
3116                  * See how old it is, we may have it marked on the actual
3117                  * net.
3118                  */
3119                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
3120                         if (tsn == net->last_cwr_tsn) {
3121                                 /* Found him, send it off */
3122                                 break;
3123                         }
3124                 }
3125                 if (net == NULL) {
3126                         /*
3127                          * If we reach here, we need to send a special CWR
3128                          * that says hey, we did this a long time ago and
3129                          * you lost the response.
3130                          */
3131                         net = TAILQ_FIRST(&stcb->asoc.nets);
3132                         if (net == NULL) {
3133                                 /* TSNH */
3134                                 return;
3135                         }
3136                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
3137                 } else {
3138                         override_bit = 0;
3139                 }
3140         } else {
3141                 override_bit = 0;
3142         }
3143         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
3144             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3145                 /*
3146                  * JRS - Use the congestion control given in the pluggable
3147                  * CC module
3148                  */
3149                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
3150                 /*
3151                  * We reduce once every RTT. So we will only lower cwnd at
3152                  * the next sending seq i.e. the window_data_tsn
3153                  */
3154                 net->cwr_window_tsn = window_data_tsn;
3155                 net->ecn_ce_pkt_cnt += pkt_cnt;
3156                 net->lost_cnt = pkt_cnt;
3157                 net->last_cwr_tsn = tsn;
3158         } else {
3159                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
3160                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
3161                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3162                         /*
3163                          * Another loss in the same window update how many
3164                          * marks/packets lost we have had.
3165                          */
3166                         int cnt = 1;
3167
3168                         if (pkt_cnt > net->lost_cnt) {
3169                                 /* Should be the case */
3170                                 cnt = (pkt_cnt - net->lost_cnt);
3171                                 net->ecn_ce_pkt_cnt += cnt;
3172                         }
3173                         net->lost_cnt = pkt_cnt;
3174                         net->last_cwr_tsn = tsn;
3175                         /*
3176                          * Most CC functions will ignore this call, since we
3177                          * are in-window yet of the initial CE the peer saw.
3178                          */
3179                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
3180                 }
3181         }
3182         /*
3183          * We always send a CWR this way if our previous one was lost our
3184          * peer will get an update, or if it is not time again to reduce we
3185          * still get the cwr to the peer. Note we set the override when we
3186          * could not find the TSN on the chunk or the destination network.
3187          */
3188         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
3189 }
3190
3191 static void
3192 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3193 {
3194         /*
3195          * Here we get a CWR from the peer. We must look in the outqueue and
3196          * make sure that we have a covered ECNE in the control chunk part.
3197          * If so remove it.
3198          */
3199         struct sctp_tmit_chunk *chk, *nchk;
3200         struct sctp_ecne_chunk *ecne;
3201         int override;
3202         uint32_t cwr_tsn;
3203
3204         cwr_tsn = ntohl(cp->tsn);
3205         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3206         TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) {
3207                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3208                         continue;
3209                 }
3210                 if ((override == 0) && (chk->whoTo != net)) {
3211                         /* Must be from the right src unless override is set */
3212                         continue;
3213                 }
3214                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3215                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3216                         /* this covers this ECNE, we can remove it */
3217                         stcb->asoc.ecn_echo_cnt_onq--;
3218                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3219                             sctp_next);
3220                         stcb->asoc.ctrl_queue_cnt--;
3221                         sctp_m_freem(chk->data);
3222                         chk->data = NULL;
3223                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3224                         if (override == 0) {
3225                                 break;
3226                         }
3227                 }
3228         }
3229 }
3230
3231 static void
3232 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3233     struct sctp_tcb *stcb, struct sctp_nets *net)
3234 {
3235         struct sctp_association *asoc;
3236 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3237         struct socket *so;
3238 #endif
3239
3240         SCTPDBG(SCTP_DEBUG_INPUT2,
3241             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3242         if (stcb == NULL)
3243                 return;
3244
3245         asoc = &stcb->asoc;
3246         /* process according to association state */
3247         if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3248                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3249                 SCTPDBG(SCTP_DEBUG_INPUT2,
3250                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3251                 SCTP_TCB_UNLOCK(stcb);
3252                 return;
3253         }
3254         /* notify upper layer protocol */
3255         if (stcb->sctp_socket) {
3256                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3257         }
3258 #ifdef INVARIANTS
3259         if (!TAILQ_EMPTY(&asoc->send_queue) ||
3260             !TAILQ_EMPTY(&asoc->sent_queue) ||
3261             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
3262                 panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
3263         }
3264 #endif
3265         /* stop the timer */
3266         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net,
3267             SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3268         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3269         /* free the TCB */
3270         SCTPDBG(SCTP_DEBUG_INPUT2,
3271             "sctp_handle_shutdown_complete: calls free-asoc\n");
3272 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3273         so = SCTP_INP_SO(stcb->sctp_ep);
3274         atomic_add_int(&stcb->asoc.refcnt, 1);
3275         SCTP_TCB_UNLOCK(stcb);
3276         SCTP_SOCKET_LOCK(so, 1);
3277         SCTP_TCB_LOCK(stcb);
3278         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3279 #endif
3280         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
3281             SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3282 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3283         SCTP_SOCKET_UNLOCK(so, 1);
3284 #endif
3285         return;
3286 }
3287
3288 static int
3289 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3290     struct sctp_nets *net, uint8_t flg)
3291 {
3292         switch (desc->chunk_type) {
3293         case SCTP_DATA:
3294                 /* find the tsn to resend (possibly */
3295                 {
3296                         uint32_t tsn;
3297                         struct sctp_tmit_chunk *tp1;
3298
3299                         tsn = ntohl(desc->tsn_ifany);
3300                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3301                                 if (tp1->rec.data.tsn == tsn) {
3302                                         /* found it */
3303                                         break;
3304                                 }
3305                                 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) {
3306                                         /* not found */
3307                                         tp1 = NULL;
3308                                         break;
3309                                 }
3310                         }
3311                         if (tp1 == NULL) {
3312                                 /*
3313                                  * Do it the other way , aka without paying
3314                                  * attention to queue seq order.
3315                                  */
3316                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3317                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3318                                         if (tp1->rec.data.tsn == tsn) {
3319                                                 /* found it */
3320                                                 break;
3321                                         }
3322                                 }
3323                         }
3324                         if (tp1 == NULL) {
3325                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3326                         }
3327                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3328                                 uint8_t *ddp;
3329
3330                                 if (((flg & SCTP_BADCRC) == 0) &&
3331                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3332                                         return (0);
3333                                 }
3334                                 if ((stcb->asoc.peers_rwnd == 0) &&
3335                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3336                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3337                                         return (0);
3338                                 }
3339                                 if (stcb->asoc.peers_rwnd == 0 &&
3340                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3341                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3342                                         return (0);
3343                                 }
3344                                 ddp = (uint8_t *)(mtod(tp1->data, caddr_t)+
3345                                     sizeof(struct sctp_data_chunk));
3346                                 {
3347                                         unsigned int iii;
3348
3349                                         for (iii = 0; iii < sizeof(desc->data_bytes);
3350                                             iii++) {
3351                                                 if (ddp[iii] != desc->data_bytes[iii]) {
3352                                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3353                                                         return (-1);
3354                                                 }
3355                                         }
3356                                 }
3357
3358                                 if (tp1->do_rtt) {
3359                                         /*
3360                                          * this guy had a RTO calculation
3361                                          * pending on it, cancel it
3362                                          */
3363                                         if (tp1->whoTo->rto_needed == 0) {
3364                                                 tp1->whoTo->rto_needed = 1;
3365                                         }
3366                                         tp1->do_rtt = 0;
3367                                 }
3368                                 SCTP_STAT_INCR(sctps_pdrpmark);
3369                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3370                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3371                                 /*
3372                                  * mark it as if we were doing a FR, since
3373                                  * we will be getting gap ack reports behind
3374                                  * the info from the router.
3375                                  */
3376                                 tp1->rec.data.doing_fast_retransmit = 1;
3377                                 /*
3378                                  * mark the tsn with what sequences can
3379                                  * cause a new FR.
3380                                  */
3381                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3382                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3383                                 } else {
3384                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn;
3385                                 }
3386
3387                                 /* restart the timer */
3388                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3389                                     stcb, tp1->whoTo,
3390                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3391                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3392                                     stcb, tp1->whoTo);
3393
3394                                 /* fix counts and things */
3395                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3396                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3397                                             tp1->whoTo->flight_size,
3398                                             tp1->book_size,
3399                                             (uint32_t)(uintptr_t)stcb,
3400                                             tp1->rec.data.tsn);
3401                                 }
3402                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3403                                         sctp_flight_size_decrease(tp1);
3404                                         sctp_total_flight_decrease(stcb, tp1);
3405                                 }
3406                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3407                         } {
3408                                 /* audit code */
3409                                 unsigned int audit;
3410
3411                                 audit = 0;
3412                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3413                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3414                                                 audit++;
3415                                 }
3416                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3417                                     sctp_next) {
3418                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3419                                                 audit++;
3420                                 }
3421                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3422                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3423                                             audit, stcb->asoc.sent_queue_retran_cnt);
3424 #ifndef SCTP_AUDITING_ENABLED
3425                                         stcb->asoc.sent_queue_retran_cnt = audit;
3426 #endif
3427                                 }
3428                         }
3429                 }
3430                 break;
3431         case SCTP_ASCONF:
3432                 {
3433                         struct sctp_tmit_chunk *asconf;
3434
3435                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3436                             sctp_next) {
3437                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3438                                         break;
3439                                 }
3440                         }
3441                         if (asconf) {
3442                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3443                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3444                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3445                                 asconf->snd_count--;
3446                         }
3447                 }
3448                 break;
3449         case SCTP_INITIATION:
3450                 /* resend the INIT */
3451                 stcb->asoc.dropped_special_cnt++;
3452                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3453                         /*
3454                          * If we can get it in, in a few attempts we do
3455                          * this, otherwise we let the timer fire.
3456                          */
3457                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3458                             stcb, net,
3459                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
3460                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3461                 }
3462                 break;
3463         case SCTP_SELECTIVE_ACK:
3464         case SCTP_NR_SELECTIVE_ACK:
3465                 /* resend the sack */
3466                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3467                 break;
3468         case SCTP_HEARTBEAT_REQUEST:
3469                 /* resend a demand HB */
3470                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3471                         /*
3472                          * Only retransmit if we KNOW we wont destroy the
3473                          * tcb
3474                          */
3475                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3476                 }
3477                 break;
3478         case SCTP_SHUTDOWN:
3479                 sctp_send_shutdown(stcb, net);
3480                 break;
3481         case SCTP_SHUTDOWN_ACK:
3482                 sctp_send_shutdown_ack(stcb, net);
3483                 break;
3484         case SCTP_COOKIE_ECHO:
3485                 {
3486                         struct sctp_tmit_chunk *cookie;
3487
3488                         cookie = NULL;
3489                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3490                             sctp_next) {
3491                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3492                                         break;
3493                                 }
3494                         }
3495                         if (cookie) {
3496                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3497                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3498                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3499                                 sctp_stop_all_cookie_timers(stcb);
3500                         }
3501                 }
3502                 break;
3503         case SCTP_COOKIE_ACK:
3504                 sctp_send_cookie_ack(stcb);
3505                 break;
3506         case SCTP_ASCONF_ACK:
3507                 /* resend last asconf ack */
3508                 sctp_send_asconf_ack(stcb);
3509                 break;
3510         case SCTP_IFORWARD_CUM_TSN:
3511         case SCTP_FORWARD_CUM_TSN:
3512                 send_forward_tsn(stcb, &stcb->asoc);
3513                 break;
3514                 /* can't do anything with these */
3515         case SCTP_PACKET_DROPPED:
3516         case SCTP_INITIATION_ACK:       /* this should not happen */
3517         case SCTP_HEARTBEAT_ACK:
3518         case SCTP_ABORT_ASSOCIATION:
3519         case SCTP_OPERATION_ERROR:
3520         case SCTP_SHUTDOWN_COMPLETE:
3521         case SCTP_ECN_ECHO:
3522         case SCTP_ECN_CWR:
3523         default:
3524                 break;
3525         }
3526         return (0);
3527 }
3528
3529 void
3530 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3531 {
3532         uint32_t i;
3533         uint16_t temp;
3534
3535         /*
3536          * We set things to 0xffffffff since this is the last delivered
3537          * sequence and we will be sending in 0 after the reset.
3538          */
3539
3540         if (number_entries) {
3541                 for (i = 0; i < number_entries; i++) {
3542                         temp = ntohs(list[i]);
3543                         if (temp >= stcb->asoc.streamincnt) {
3544                                 continue;
3545                         }
3546                         stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff;
3547                 }
3548         } else {
3549                 list = NULL;
3550                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3551                         stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
3552                 }
3553         }
3554         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3555 }
3556
3557 static void
3558 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3559 {
3560         uint32_t i;
3561         uint16_t temp;
3562
3563         if (number_entries > 0) {
3564                 for (i = 0; i < number_entries; i++) {
3565                         temp = ntohs(list[i]);
3566                         if (temp >= stcb->asoc.streamoutcnt) {
3567                                 /* no such stream */
3568                                 continue;
3569                         }
3570                         stcb->asoc.strmout[temp].next_mid_ordered = 0;
3571                         stcb->asoc.strmout[temp].next_mid_unordered = 0;
3572                 }
3573         } else {
3574                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3575                         stcb->asoc.strmout[i].next_mid_ordered = 0;
3576                         stcb->asoc.strmout[i].next_mid_unordered = 0;
3577                 }
3578         }
3579         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3580 }
3581
3582 static void
3583 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3584 {
3585         uint32_t i;
3586         uint16_t temp;
3587
3588         if (number_entries > 0) {
3589                 for (i = 0; i < number_entries; i++) {
3590                         temp = ntohs(list[i]);
3591                         if (temp >= stcb->asoc.streamoutcnt) {
3592                                 /* no such stream */
3593                                 continue;
3594                         }
3595                         stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN;
3596                 }
3597         } else {
3598                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3599                         stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN;
3600                 }
3601         }
3602 }
3603
3604
3605 struct sctp_stream_reset_request *
3606 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3607 {
3608         struct sctp_association *asoc;
3609         struct sctp_chunkhdr *ch;
3610         struct sctp_stream_reset_request *r;
3611         struct sctp_tmit_chunk *chk;
3612         int len, clen;
3613
3614         asoc = &stcb->asoc;
3615         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3616                 asoc->stream_reset_outstanding = 0;
3617                 return (NULL);
3618         }
3619         if (stcb->asoc.str_reset == NULL) {
3620                 asoc->stream_reset_outstanding = 0;
3621                 return (NULL);
3622         }
3623         chk = stcb->asoc.str_reset;
3624         if (chk->data == NULL) {
3625                 return (NULL);
3626         }
3627         if (bchk) {
3628                 /* he wants a copy of the chk pointer */
3629                 *bchk = chk;
3630         }
3631         clen = chk->send_size;
3632         ch = mtod(chk->data, struct sctp_chunkhdr *);
3633         r = (struct sctp_stream_reset_request *)(ch + 1);
3634         if (ntohl(r->request_seq) == seq) {
3635                 /* found it */
3636                 return (r);
3637         }
3638         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3639         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3640                 /* move to the next one, there can only be a max of two */
3641                 r = (struct sctp_stream_reset_request *)((caddr_t)r + len);
3642                 if (ntohl(r->request_seq) == seq) {
3643                         return (r);
3644                 }
3645         }
3646         /* that seq is not here */
3647         return (NULL);
3648 }
3649
3650 static void
3651 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3652 {
3653         struct sctp_association *asoc;
3654         struct sctp_tmit_chunk *chk;
3655
3656         asoc = &stcb->asoc;
3657         chk = asoc->str_reset;
3658         if (chk == NULL) {
3659                 return;
3660         }
3661         asoc->str_reset = NULL;
3662         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb,
3663             chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28);
3664         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
3665         asoc->ctrl_queue_cnt--;
3666         if (chk->data) {
3667                 sctp_m_freem(chk->data);
3668                 chk->data = NULL;
3669         }
3670         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3671 }
3672
3673
3674 static int
3675 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3676     uint32_t seq, uint32_t action,
3677     struct sctp_stream_reset_response *respin)
3678 {
3679         uint16_t type;
3680         int lparam_len;
3681         struct sctp_association *asoc = &stcb->asoc;
3682         struct sctp_tmit_chunk *chk;
3683         struct sctp_stream_reset_request *req_param;
3684         struct sctp_stream_reset_out_request *req_out_param;
3685         struct sctp_stream_reset_in_request *req_in_param;
3686         uint32_t number_entries;
3687
3688         if (asoc->stream_reset_outstanding == 0) {
3689                 /* duplicate */
3690                 return (0);
3691         }
3692         if (seq == stcb->asoc.str_reset_seq_out) {
3693                 req_param = sctp_find_stream_reset(stcb, seq, &chk);
3694                 if (req_param != NULL) {
3695                         stcb->asoc.str_reset_seq_out++;
3696                         type = ntohs(req_param->ph.param_type);
3697                         lparam_len = ntohs(req_param->ph.param_length);
3698                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3699                                 int no_clear = 0;
3700
3701                                 req_out_param = (struct sctp_stream_reset_out_request *)req_param;
3702                                 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3703                                 asoc->stream_reset_out_is_outstanding = 0;
3704                                 if (asoc->stream_reset_outstanding)
3705                                         asoc->stream_reset_outstanding--;
3706                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3707                                         /* do it */
3708                                         sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
3709                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3710                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3711                                 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) {
3712                                         /*
3713                                          * Set it up so we don't stop
3714                                          * retransmitting
3715                                          */
3716                                         asoc->stream_reset_outstanding++;
3717                                         stcb->asoc.str_reset_seq_out--;
3718                                         asoc->stream_reset_out_is_outstanding = 1;
3719                                         no_clear = 1;
3720                                 } else {
3721                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3722                                 }
3723                                 if (no_clear == 0) {
3724                                         sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams);
3725                                 }
3726                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3727                                 req_in_param = (struct sctp_stream_reset_in_request *)req_param;
3728                                 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3729                                 if (asoc->stream_reset_outstanding)
3730                                         asoc->stream_reset_outstanding--;
3731                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3732                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3733                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3734                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3735                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3736                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3737                                 }
3738                         } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3739                                 /* Ok we now may have more streams */
3740                                 int num_stream;
3741
3742                                 num_stream = stcb->asoc.strm_pending_add_size;
3743                                 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3744                                         /* TSNH */
3745                                         num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3746                                 }
3747                                 stcb->asoc.strm_pending_add_size = 0;
3748                                 if (asoc->stream_reset_outstanding)
3749                                         asoc->stream_reset_outstanding--;
3750                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3751                                         /* Put the new streams into effect */
3752                                         int i;
3753
3754                                         for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) {
3755                                                 asoc->strmout[i].state = SCTP_STREAM_OPEN;
3756                                         }
3757                                         asoc->streamoutcnt += num_stream;
3758                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3759                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3760                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3761                                             SCTP_STREAM_CHANGE_DENIED);
3762                                 } else {
3763                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3764                                             SCTP_STREAM_CHANGE_FAILED);
3765                                 }
3766                         } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3767                                 if (asoc->stream_reset_outstanding)
3768                                         asoc->stream_reset_outstanding--;
3769                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3770                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3771                                             SCTP_STREAM_CHANGE_DENIED);
3772                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3773                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3774                                             SCTP_STREAM_CHANGE_FAILED);
3775                                 }
3776                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3777                                 /**
3778                                  * a) Adopt the new in tsn.
3779                                  * b) reset the map
3780                                  * c) Adopt the new out-tsn
3781                                  */
3782                                 struct sctp_stream_reset_response_tsn *resp;
3783                                 struct sctp_forward_tsn_chunk fwdtsn;
3784                                 int abort_flag = 0;
3785
3786                                 if (respin == NULL) {
3787                                         /* huh ? */
3788                                         return (0);
3789                                 }
3790                                 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
3791                                         return (0);
3792                                 }
3793                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3794                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3795                                         asoc->stream_reset_outstanding--;
3796                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3797                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3798                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3799                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3800                                         if (abort_flag) {
3801                                                 return (1);
3802                                         }
3803                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3804                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3805                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3806                                         }
3807
3808                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3809                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3810                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3811
3812                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3813                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3814
3815                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3816                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3817
3818                                         sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3819                                         sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3820                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3821                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3822                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3823                                             SCTP_ASSOC_RESET_DENIED);
3824                                 } else {
3825                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3826                                             SCTP_ASSOC_RESET_FAILED);
3827                                 }
3828                         }
3829                         /* get rid of the request and get the request flags */
3830                         if (asoc->stream_reset_outstanding == 0) {
3831                                 sctp_clean_up_stream_reset(stcb);
3832                         }
3833                 }
3834         }
3835         if (asoc->stream_reset_outstanding == 0) {
3836                 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3837         }
3838         return (0);
3839 }
3840
3841 static void
3842 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3843     struct sctp_tmit_chunk *chk,
3844     struct sctp_stream_reset_in_request *req, int trunc)
3845 {
3846         uint32_t seq;
3847         int len, i;
3848         int number_entries;
3849         uint16_t temp;
3850
3851         /*
3852          * peer wants me to send a str-reset to him for my outgoing seq's if
3853          * seq_in is right.
3854          */
3855         struct sctp_association *asoc = &stcb->asoc;
3856
3857         seq = ntohl(req->request_seq);
3858         if (asoc->str_reset_seq_in == seq) {
3859                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3860                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3861                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3862                 } else if (trunc) {
3863                         /* Can't do it, since they exceeded our buffer size  */
3864                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3865                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3866                         len = ntohs(req->ph.param_length);
3867                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3868                         if (number_entries) {
3869                                 for (i = 0; i < number_entries; i++) {
3870                                         temp = ntohs(req->list_of_streams[i]);
3871                                         if (temp >= stcb->asoc.streamoutcnt) {
3872                                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3873                                                 goto bad_boy;
3874                                         }
3875                                         req->list_of_streams[i] = temp;
3876                                 }
3877                                 for (i = 0; i < number_entries; i++) {
3878                                         if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) {
3879                                                 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING;
3880                                         }
3881                                 }
3882                         } else {
3883                                 /* Its all */
3884                                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3885                                         if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN)
3886                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING;
3887                                 }
3888                         }
3889                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3890                 } else {
3891                         /* Can't do it, since we have sent one out */
3892                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3893                 }
3894 bad_boy:
3895                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3896                 asoc->str_reset_seq_in++;
3897         } else if (asoc->str_reset_seq_in - 1 == seq) {
3898                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3899         } else if (asoc->str_reset_seq_in - 2 == seq) {
3900                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3901         } else {
3902                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3903         }
3904         sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3905 }
3906
3907 static int
3908 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3909     struct sctp_tmit_chunk *chk,
3910     struct sctp_stream_reset_tsn_request *req)
3911 {
3912         /* reset all in and out and update the tsn */
3913         /*
3914          * A) reset my str-seq's on in and out. B) Select a receive next,
3915          * and set cum-ack to it. Also process this selected number as a
3916          * fwd-tsn as well. C) set in the response my next sending seq.
3917          */
3918         struct sctp_forward_tsn_chunk fwdtsn;
3919         struct sctp_association *asoc = &stcb->asoc;
3920         int abort_flag = 0;
3921         uint32_t seq;
3922
3923         seq = ntohl(req->request_seq);
3924         if (asoc->str_reset_seq_in == seq) {
3925                 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3926                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3927                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3928                 } else {
3929                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3930                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3931                         fwdtsn.ch.chunk_flags = 0;
3932                         fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3933                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3934                         if (abort_flag) {
3935                                 return (1);
3936                         }
3937                         asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3938                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3939                                 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3940                         }
3941                         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3942                         asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3943                         memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3944                         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3945                         memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3946                         atomic_add_int(&asoc->sending_seq, 1);
3947                         /* save off historical data for retrans */
3948                         asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3949                         asoc->last_sending_seq[0] = asoc->sending_seq;
3950                         asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3951                         asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3952                         sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3953                         sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3954                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3955                         sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3956                 }
3957                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3958                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3959                 asoc->str_reset_seq_in++;
3960         } else if (asoc->str_reset_seq_in - 1 == seq) {
3961                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3962                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3963         } else if (asoc->str_reset_seq_in - 2 == seq) {
3964                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3965                     asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3966         } else {
3967                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3968         }
3969         return (0);
3970 }
3971
3972 static void
3973 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3974     struct sctp_tmit_chunk *chk,
3975     struct sctp_stream_reset_out_request *req, int trunc)
3976 {
3977         uint32_t seq, tsn;
3978         int number_entries, len;
3979         struct sctp_association *asoc = &stcb->asoc;
3980
3981         seq = ntohl(req->request_seq);
3982
3983         /* now if its not a duplicate we process it */
3984         if (asoc->str_reset_seq_in == seq) {
3985                 len = ntohs(req->ph.param_length);
3986                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3987                 /*
3988                  * the sender is resetting, handle the list issue.. we must
3989                  * a) verify if we can do the reset, if so no problem b) If
3990                  * we can't do the reset we must copy the request. c) queue
3991                  * it, and setup the data in processor to trigger it off
3992                  * when needed and dequeue all the queued data.
3993                  */
3994                 tsn = ntohl(req->send_reset_at_tsn);
3995
3996                 /* move the reset action back one */
3997                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3998                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3999                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4000                 } else if (trunc) {
4001                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4002                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
4003                         /* we can do it now */
4004                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
4005                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4006                 } else {
4007                         /*
4008                          * we must queue it up and thus wait for the TSN's
4009                          * to arrive that are at or before tsn
4010                          */
4011                         struct sctp_stream_reset_list *liste;
4012                         int siz;
4013
4014                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
4015                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
4016                             siz, SCTP_M_STRESET);
4017                         if (liste == NULL) {
4018                                 /* gak out of memory */
4019                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4020                                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4021                                 return;
4022                         }
4023                         liste->seq = seq;
4024                         liste->tsn = tsn;
4025                         liste->number_entries = number_entries;
4026                         memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
4027                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
4028                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS;
4029                 }
4030                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4031                 asoc->str_reset_seq_in++;
4032         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4033                 /*
4034                  * one seq back, just echo back last action since my
4035                  * response was lost.
4036                  */
4037                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4038         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4039                 /*
4040                  * two seq back, just echo back last action since my
4041                  * response was lost.
4042                  */
4043                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4044         } else {
4045                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4046         }
4047 }
4048
4049 static void
4050 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
4051     struct sctp_stream_reset_add_strm *str_add)
4052 {
4053         /*
4054          * Peer is requesting to add more streams. If its within our
4055          * max-streams we will allow it.
4056          */
4057         uint32_t num_stream, i;
4058         uint32_t seq;
4059         struct sctp_association *asoc = &stcb->asoc;
4060         struct sctp_queued_to_read *ctl, *nctl;
4061
4062         /* Get the number. */
4063         seq = ntohl(str_add->request_seq);
4064         num_stream = ntohs(str_add->number_of_streams);
4065         /* Now what would be the new total? */
4066         if (asoc->str_reset_seq_in == seq) {
4067                 num_stream += stcb->asoc.streamincnt;
4068                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4069                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4070                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4071                 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
4072                     (num_stream > 0xffff)) {
4073                         /* We must reject it they ask for to many */
4074         denied:
4075                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4076                 } else {
4077                         /* Ok, we can do that :-) */
4078                         struct sctp_stream_in *oldstrm;
4079
4080                         /* save off the old */
4081                         oldstrm = stcb->asoc.strmin;
4082                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
4083                             (num_stream * sizeof(struct sctp_stream_in)),
4084                             SCTP_M_STRMI);
4085                         if (stcb->asoc.strmin == NULL) {
4086                                 stcb->asoc.strmin = oldstrm;
4087                                 goto denied;
4088                         }
4089                         /* copy off the old data */
4090                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
4091                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
4092                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
4093                                 stcb->asoc.strmin[i].sid = i;
4094                                 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered;
4095                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
4096                                 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started;
4097                                 /* now anything on those queues? */
4098                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) {
4099                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm);
4100                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm);
4101                                 }
4102                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) {
4103                                         TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm);
4104                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm);
4105                                 }
4106                         }
4107                         /* Init the new streams */
4108                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
4109                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
4110                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
4111                                 stcb->asoc.strmin[i].sid = i;
4112                                 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
4113                                 stcb->asoc.strmin[i].pd_api_started = 0;
4114                                 stcb->asoc.strmin[i].delivery_started = 0;
4115                         }
4116                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
4117                         /* update the size */
4118                         stcb->asoc.streamincnt = num_stream;
4119                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4120                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
4121                 }
4122                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4123                 asoc->str_reset_seq_in++;
4124         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4125                 /*
4126                  * one seq back, just echo back last action since my
4127                  * response was lost.
4128                  */
4129                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4130         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4131                 /*
4132                  * two seq back, just echo back last action since my
4133                  * response was lost.
4134                  */
4135                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4136         } else {
4137                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4138
4139         }
4140 }
4141
4142 static void
4143 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
4144     struct sctp_stream_reset_add_strm *str_add)
4145 {
4146         /*
4147          * Peer is requesting to add more streams. If its within our
4148          * max-streams we will allow it.
4149          */
4150         uint16_t num_stream;
4151         uint32_t seq;
4152         struct sctp_association *asoc = &stcb->asoc;
4153
4154         /* Get the number. */
4155         seq = ntohl(str_add->request_seq);
4156         num_stream = ntohs(str_add->number_of_streams);
4157         /* Now what would be the new total? */
4158         if (asoc->str_reset_seq_in == seq) {
4159                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4160                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4161                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4162                 } else if (stcb->asoc.stream_reset_outstanding) {
4163                         /* We must reject it we have something pending */
4164                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
4165                 } else {
4166                         /* Ok, we can do that :-) */
4167                         int mychk;
4168
4169                         mychk = stcb->asoc.streamoutcnt;
4170                         mychk += num_stream;
4171                         if (mychk < 0x10000) {
4172                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4173                                 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) {
4174                                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4175                                 }
4176                         } else {
4177                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4178                         }
4179                 }
4180                 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
4181                 asoc->str_reset_seq_in++;
4182         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4183                 /*
4184                  * one seq back, just echo back last action since my
4185                  * response was lost.
4186                  */
4187                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4188         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4189                 /*
4190                  * two seq back, just echo back last action since my
4191                  * response was lost.
4192                  */
4193                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4194         } else {
4195                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4196         }
4197 }
4198
4199 #ifdef __GNUC__
4200 __attribute__((noinline))
4201 #endif
4202 static int
4203 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
4204     struct sctp_chunkhdr *ch_req)
4205 {
4206         uint16_t remaining_length, param_len, ptype;
4207         struct sctp_paramhdr pstore;
4208         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
4209         uint32_t seq = 0;
4210         int num_req = 0;
4211         int trunc = 0;
4212         struct sctp_tmit_chunk *chk;
4213         struct sctp_chunkhdr *ch;
4214         struct sctp_paramhdr *ph;
4215         int ret_code = 0;
4216         int num_param = 0;
4217
4218         /* now it may be a reset or a reset-response */
4219         remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
4220
4221         /* setup for adding the response */
4222         sctp_alloc_a_chunk(stcb, chk);
4223         if (chk == NULL) {
4224                 return (ret_code);
4225         }
4226         chk->copy_by_ref = 0;
4227         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
4228         chk->rec.chunk_id.can_take_data = 0;
4229         chk->flags = 0;
4230         chk->asoc = &stcb->asoc;
4231         chk->no_fr_allowed = 0;
4232         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
4233         chk->book_size_scale = 0;
4234         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
4235         if (chk->data == NULL) {
4236 strres_nochunk:
4237                 if (chk->data) {
4238                         sctp_m_freem(chk->data);
4239                         chk->data = NULL;
4240                 }
4241                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
4242                 return (ret_code);
4243         }
4244         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
4245
4246         /* setup chunk parameters */
4247         chk->sent = SCTP_DATAGRAM_UNSENT;
4248         chk->snd_count = 0;
4249         chk->whoTo = NULL;
4250
4251         ch = mtod(chk->data, struct sctp_chunkhdr *);
4252         ch->chunk_type = SCTP_STREAM_RESET;
4253         ch->chunk_flags = 0;
4254         ch->chunk_length = htons(chk->send_size);
4255         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4256         offset += sizeof(struct sctp_chunkhdr);
4257         while (remaining_length >= sizeof(struct sctp_paramhdr)) {
4258                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore);
4259                 if (ph == NULL) {
4260                         /* TSNH */
4261                         break;
4262                 }
4263                 param_len = ntohs(ph->param_length);
4264                 if ((param_len > remaining_length) ||
4265                     (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
4266                         /* bad parameter length */
4267                         break;
4268                 }
4269                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
4270                     (uint8_t *)&cstore);
4271                 if (ph == NULL) {
4272                         /* TSNH */
4273                         break;
4274                 }
4275                 ptype = ntohs(ph->param_type);
4276                 num_param++;
4277                 if (param_len > sizeof(cstore)) {
4278                         trunc = 1;
4279                 } else {
4280                         trunc = 0;
4281                 }
4282                 if (num_param > SCTP_MAX_RESET_PARAMS) {
4283                         /* hit the max of parameters already sorry.. */
4284                         break;
4285                 }
4286                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4287                         struct sctp_stream_reset_out_request *req_out;
4288
4289                         if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
4290                                 break;
4291                         }
4292                         req_out = (struct sctp_stream_reset_out_request *)ph;
4293                         num_req++;
4294                         if (stcb->asoc.stream_reset_outstanding) {
4295                                 seq = ntohl(req_out->response_seq);
4296                                 if (seq == stcb->asoc.str_reset_seq_out) {
4297                                         /* implicit ack */
4298                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4299                                 }
4300                         }
4301                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4302                 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4303                         struct sctp_stream_reset_add_strm *str_add;
4304
4305                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4306                                 break;
4307                         }
4308                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4309                         num_req++;
4310                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4311                 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4312                         struct sctp_stream_reset_add_strm *str_add;
4313
4314                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4315                                 break;
4316                         }
4317                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4318                         num_req++;
4319                         sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4320                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4321                         struct sctp_stream_reset_in_request *req_in;
4322
4323                         num_req++;
4324                         req_in = (struct sctp_stream_reset_in_request *)ph;
4325                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4326                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4327                         struct sctp_stream_reset_tsn_request *req_tsn;
4328
4329                         num_req++;
4330                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4331                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4332                                 ret_code = 1;
4333                                 goto strres_nochunk;
4334                         }
4335                         /* no more */
4336                         break;
4337                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4338                         struct sctp_stream_reset_response *resp;
4339                         uint32_t result;
4340
4341                         if (param_len < sizeof(struct sctp_stream_reset_response)) {
4342                                 break;
4343                         }
4344                         resp = (struct sctp_stream_reset_response *)ph;
4345                         seq = ntohl(resp->response_seq);
4346                         result = ntohl(resp->result);
4347                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4348                                 ret_code = 1;
4349                                 goto strres_nochunk;
4350                         }
4351                 } else {
4352                         break;
4353                 }
4354                 offset += SCTP_SIZE32(param_len);
4355                 if (remaining_length >= SCTP_SIZE32(param_len)) {
4356                         remaining_length -= SCTP_SIZE32(param_len);
4357                 } else {
4358                         remaining_length = 0;
4359                 }
4360         }
4361         if (num_req == 0) {
4362                 /* we have no response free the stuff */
4363                 goto strres_nochunk;
4364         }
4365         /* ok we have a chunk to link in */
4366         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4367             chk,
4368             sctp_next);
4369         stcb->asoc.ctrl_queue_cnt++;
4370         return (ret_code);
4371 }
4372
4373 /*
4374  * Handle a router or endpoints report of a packet loss, there are two ways
4375  * to handle this, either we get the whole packet and must disect it
4376  * ourselves (possibly with truncation and or corruption) or it is a summary
4377  * from a middle box that did the disectting for us.
4378  */
4379 static void
4380 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4381     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4382 {
4383         uint32_t bottle_bw, on_queue;
4384         uint16_t trunc_len;
4385         unsigned int chlen;
4386         unsigned int at;
4387         struct sctp_chunk_desc desc;
4388         struct sctp_chunkhdr *ch;
4389
4390         chlen = ntohs(cp->ch.chunk_length);
4391         chlen -= sizeof(struct sctp_pktdrop_chunk);
4392         /* XXX possible chlen underflow */
4393         if (chlen == 0) {
4394                 ch = NULL;
4395                 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
4396                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4397         } else {
4398                 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
4399                 chlen -= sizeof(struct sctphdr);
4400                 /* XXX possible chlen underflow */
4401                 memset(&desc, 0, sizeof(desc));
4402         }
4403         trunc_len = (uint16_t)ntohs(cp->trunc_len);
4404         if (trunc_len > limit) {
4405                 trunc_len = limit;
4406         }
4407
4408         /* now the chunks themselves */
4409         while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
4410                 desc.chunk_type = ch->chunk_type;
4411                 /* get amount we need to move */
4412                 at = ntohs(ch->chunk_length);
4413                 if (at < sizeof(struct sctp_chunkhdr)) {
4414                         /* corrupt chunk, maybe at the end? */
4415                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4416                         break;
4417                 }
4418                 if (trunc_len == 0) {
4419                         /* we are supposed to have all of it */
4420                         if (at > chlen) {
4421                                 /* corrupt skip it */
4422                                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4423                                 break;
4424                         }
4425                 } else {
4426                         /* is there enough of it left ? */
4427                         if (desc.chunk_type == SCTP_DATA) {
4428                                 if (chlen < (sizeof(struct sctp_data_chunk) +
4429                                     sizeof(desc.data_bytes))) {
4430                                         break;
4431                                 }
4432                         } else {
4433                                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4434                                         break;
4435                                 }
4436                         }
4437                 }
4438                 if (desc.chunk_type == SCTP_DATA) {
4439                         /* can we get out the tsn? */
4440                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4441                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4442
4443                         if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
4444                                 /* yep */
4445                                 struct sctp_data_chunk *dcp;
4446                                 uint8_t *ddp;
4447                                 unsigned int iii;
4448
4449                                 dcp = (struct sctp_data_chunk *)ch;
4450                                 ddp = (uint8_t *)(dcp + 1);
4451                                 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
4452                                         desc.data_bytes[iii] = ddp[iii];
4453                                 }
4454                                 desc.tsn_ifany = dcp->dp.tsn;
4455                         } else {
4456                                 /* nope we are done. */
4457                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4458                                 break;
4459                         }
4460                 } else {
4461                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4462                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4463                 }
4464
4465                 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
4466                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4467                         break;
4468                 }
4469                 if (SCTP_SIZE32(at) > chlen) {
4470                         break;
4471                 }
4472                 chlen -= SCTP_SIZE32(at);
4473                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4474                         /* done, none left */
4475                         break;
4476                 }
4477                 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
4478         }
4479         /* Now update any rwnd --- possibly */
4480         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4481                 /* From a peer, we get a rwnd report */
4482                 uint32_t a_rwnd;
4483
4484                 SCTP_STAT_INCR(sctps_pdrpfehos);
4485
4486                 bottle_bw = ntohl(cp->bottle_bw);
4487                 on_queue = ntohl(cp->current_onq);
4488                 if (bottle_bw && on_queue) {
4489                         /* a rwnd report is in here */
4490                         if (bottle_bw > on_queue)
4491                                 a_rwnd = bottle_bw - on_queue;
4492                         else
4493                                 a_rwnd = 0;
4494
4495                         if (a_rwnd == 0)
4496                                 stcb->asoc.peers_rwnd = 0;
4497                         else {
4498                                 if (a_rwnd > stcb->asoc.total_flight) {
4499                                         stcb->asoc.peers_rwnd =
4500                                             a_rwnd - stcb->asoc.total_flight;
4501                                 } else {
4502                                         stcb->asoc.peers_rwnd = 0;
4503                                 }
4504                                 if (stcb->asoc.peers_rwnd <
4505                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4506                                         /* SWS sender side engages */
4507                                         stcb->asoc.peers_rwnd = 0;
4508                                 }
4509                         }
4510                 }
4511         } else {
4512                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4513         }
4514
4515         /* now middle boxes in sat networks get a cwnd bump */
4516         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
4517             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4518             (stcb->asoc.sat_network)) {
4519                 /*
4520                  * This is debatable but for sat networks it makes sense
4521                  * Note if a T3 timer has went off, we will prohibit any
4522                  * changes to cwnd until we exit the t3 loss recovery.
4523                  */
4524                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4525                     net, cp, &bottle_bw, &on_queue);
4526         }
4527 }
4528
4529 /*
4530  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4531  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4532  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4533  * length of the complete packet outputs: - length: modified to remaining
4534  * length after control processing - netp: modified to new sctp_nets after
4535  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4536  * bad packet,...) otherwise return the tcb for this packet
4537  */
4538 #ifdef __GNUC__
4539 __attribute__((noinline))
4540 #endif
4541 static struct sctp_tcb *
4542 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4543     struct sockaddr *src, struct sockaddr *dst,
4544     struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4545     struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4546     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
4547     uint32_t vrf_id, uint16_t port)
4548 {
4549         struct sctp_association *asoc;
4550         struct mbuf *op_err;
4551         char msg[SCTP_DIAG_INFO_LEN];
4552         uint32_t vtag_in;
4553         int num_chunks = 0;     /* number of control chunks processed */
4554         uint32_t chk_length, contiguous;
4555         int ret;
4556         int abort_no_unlock = 0;
4557         int ecne_seen = 0;
4558
4559         /*
4560          * How big should this be, and should it be alloc'd? Lets try the
4561          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4562          * until we get into jumbo grams and such..
4563          */
4564         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4565         int got_auth = 0;
4566         uint32_t auth_offset = 0, auth_len = 0;
4567         int auth_skipped = 0;
4568         int asconf_cnt = 0;
4569 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4570         struct socket *so;
4571 #endif
4572
4573         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4574             iphlen, *offset, length, (void *)stcb);
4575
4576         if (stcb) {
4577                 SCTP_TCB_LOCK_ASSERT(stcb);
4578         }
4579         /* validate chunk header length... */
4580         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4581                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4582                     ntohs(ch->chunk_length));
4583                 *offset = length;
4584                 return (stcb);
4585         }
4586         /*
4587          * validate the verification tag
4588          */
4589         vtag_in = ntohl(sh->v_tag);
4590
4591         if (ch->chunk_type == SCTP_INITIATION) {
4592                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4593                     ntohs(ch->chunk_length), vtag_in);
4594                 if (vtag_in != 0) {
4595                         /* protocol error- silently discard... */
4596                         SCTP_STAT_INCR(sctps_badvtag);
4597                         if (stcb != NULL) {
4598                                 SCTP_TCB_UNLOCK(stcb);
4599                         }
4600                         return (NULL);
4601                 }
4602         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4603                 /*
4604                  * If there is no stcb, skip the AUTH chunk and process
4605                  * later after a stcb is found (to validate the lookup was
4606                  * valid.
4607                  */
4608                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4609                     (stcb == NULL) &&
4610                     (inp->auth_supported == 1)) {
4611                         /* save this chunk for later processing */
4612                         auth_skipped = 1;
4613                         auth_offset = *offset;
4614                         auth_len = ntohs(ch->chunk_length);
4615
4616                         /* (temporarily) move past this chunk */
4617                         *offset += SCTP_SIZE32(auth_len);
4618                         if (*offset >= length) {
4619                                 /* no more data left in the mbuf chain */
4620                                 *offset = length;
4621                                 return (NULL);
4622                         }
4623                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4624                             sizeof(struct sctp_chunkhdr), chunk_buf);
4625                 }
4626                 if (ch == NULL) {
4627                         /* Help */
4628                         *offset = length;
4629                         return (stcb);
4630                 }
4631                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4632                         goto process_control_chunks;
4633                 }
4634                 /*
4635                  * first check if it's an ASCONF with an unknown src addr we
4636                  * need to look inside to find the association
4637                  */
4638                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4639                         struct sctp_chunkhdr *asconf_ch = ch;
4640                         uint32_t asconf_offset = 0, asconf_len = 0;
4641
4642                         /* inp's refcount may be reduced */
4643                         SCTP_INP_INCR_REF(inp);
4644
4645                         asconf_offset = *offset;
4646                         do {
4647                                 asconf_len = ntohs(asconf_ch->chunk_length);
4648                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4649                                         break;
4650                                 stcb = sctp_findassociation_ep_asconf(m,
4651                                     *offset,
4652                                     dst,
4653                                     sh, &inp, netp, vrf_id);
4654                                 if (stcb != NULL)
4655                                         break;
4656                                 asconf_offset += SCTP_SIZE32(asconf_len);
4657                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4658                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4659                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4660                         if (stcb == NULL) {
4661                                 /*
4662                                  * reduce inp's refcount if not reduced in
4663                                  * sctp_findassociation_ep_asconf().
4664                                  */
4665                                 SCTP_INP_DECR_REF(inp);
4666                         }
4667
4668                         /* now go back and verify any auth chunk to be sure */
4669                         if (auth_skipped && (stcb != NULL)) {
4670                                 struct sctp_auth_chunk *auth;
4671
4672                                 auth = (struct sctp_auth_chunk *)
4673                                     sctp_m_getptr(m, auth_offset,
4674                                     auth_len, chunk_buf);
4675                                 got_auth = 1;
4676                                 auth_skipped = 0;
4677                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4678                                     auth_offset)) {
4679                                         /* auth HMAC failed so dump it */
4680                                         *offset = length;
4681                                         return (stcb);
4682                                 } else {
4683                                         /* remaining chunks are HMAC checked */
4684                                         stcb->asoc.authenticated = 1;
4685                                 }
4686                         }
4687                 }
4688                 if (stcb == NULL) {
4689                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4690                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4691                             msg);
4692                         /* no association, so it's out of the blue... */
4693                         sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
4694                             mflowtype, mflowid, inp->fibnum,
4695                             vrf_id, port);
4696                         *offset = length;
4697                         return (NULL);
4698                 }
4699                 asoc = &stcb->asoc;
4700                 /* ABORT and SHUTDOWN can use either v_tag... */
4701                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4702                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4703                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4704                         /* Take the T-bit always into account. */
4705                         if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
4706                             (vtag_in == asoc->my_vtag)) ||
4707                             (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
4708                             (asoc->peer_vtag != htonl(0)) &&
4709                             (vtag_in == asoc->peer_vtag))) {
4710                                 /* this is valid */
4711                         } else {
4712                                 /* drop this packet... */
4713                                 SCTP_STAT_INCR(sctps_badvtag);
4714                                 if (stcb != NULL) {
4715                                         SCTP_TCB_UNLOCK(stcb);
4716                                 }
4717                                 return (NULL);
4718                         }
4719                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4720                         if (vtag_in != asoc->my_vtag) {
4721                                 /*
4722                                  * this could be a stale SHUTDOWN-ACK or the
4723                                  * peer never got the SHUTDOWN-COMPLETE and
4724                                  * is still hung; we have started a new asoc
4725                                  * but it won't complete until the shutdown
4726                                  * is completed
4727                                  */
4728                                 if (stcb != NULL) {
4729                                         SCTP_TCB_UNLOCK(stcb);
4730                                 }
4731                                 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4732                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4733                                     msg);
4734                                 sctp_handle_ootb(m, iphlen, *offset, src, dst,
4735                                     sh, inp, op_err,
4736                                     mflowtype, mflowid, fibnum,
4737                                     vrf_id, port);
4738                                 return (NULL);
4739                         }
4740                 } else {
4741                         /* for all other chunks, vtag must match */
4742                         if (vtag_in != asoc->my_vtag) {
4743                                 /* invalid vtag... */
4744                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4745                                     "invalid vtag: %xh, expect %xh\n",
4746                                     vtag_in, asoc->my_vtag);
4747                                 SCTP_STAT_INCR(sctps_badvtag);
4748                                 if (stcb != NULL) {
4749                                         SCTP_TCB_UNLOCK(stcb);
4750                                 }
4751                                 *offset = length;
4752                                 return (NULL);
4753                         }
4754                 }
4755         }                       /* end if !SCTP_COOKIE_ECHO */
4756         /*
4757          * process all control chunks...
4758          */
4759         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4760             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4761             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4762             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
4763                 /* implied cookie-ack.. we must have lost the ack */
4764                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4765                     *netp);
4766         }
4767
4768 process_control_chunks:
4769         while (IS_SCTP_CONTROL(ch)) {
4770                 /* validate chunk length */
4771                 chk_length = ntohs(ch->chunk_length);
4772                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4773                     ch->chunk_type, chk_length);
4774                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4775                 if (chk_length < sizeof(*ch) ||
4776                     (*offset + (int)chk_length) > length) {
4777                         *offset = length;
4778                         return (stcb);
4779                 }
4780                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4781                 /*
4782                  * INIT and INIT-ACK only gets the init ack "header" portion
4783                  * only because we don't have to process the peer's COOKIE.
4784                  * All others get a complete chunk.
4785                  */
4786                 switch (ch->chunk_type) {
4787                 case SCTP_INITIATION:
4788                         contiguous = sizeof(struct sctp_init_chunk);
4789                         break;
4790                 case SCTP_INITIATION_ACK:
4791                         contiguous = sizeof(struct sctp_init_ack_chunk);
4792                         break;
4793                 default:
4794                         contiguous = min(chk_length, sizeof(chunk_buf));
4795                         break;
4796                 }
4797                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4798                     contiguous,
4799                     chunk_buf);
4800                 if (ch == NULL) {
4801                         *offset = length;
4802                         if (stcb != NULL) {
4803                                 SCTP_TCB_UNLOCK(stcb);
4804                         }
4805                         return (NULL);
4806                 }
4807
4808                 num_chunks++;
4809                 /* Save off the last place we got a control from */
4810                 if (stcb != NULL) {
4811                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4812                                 /*
4813                                  * allow last_control to be NULL if
4814                                  * ASCONF... ASCONF processing will find the
4815                                  * right net later
4816                                  */
4817                                 if ((netp != NULL) && (*netp != NULL))
4818                                         stcb->asoc.last_control_chunk_from = *netp;
4819                         }
4820                 }
4821 #ifdef SCTP_AUDITING_ENABLED
4822                 sctp_audit_log(0xB0, ch->chunk_type);
4823 #endif
4824
4825                 /* check to see if this chunk required auth, but isn't */
4826                 if ((stcb != NULL) &&
4827                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4828                     !stcb->asoc.authenticated) {
4829                         /* "silently" ignore */
4830                         SCTP_STAT_INCR(sctps_recvauthmissing);
4831                         goto next_chunk;
4832                 }
4833                 switch (ch->chunk_type) {
4834                 case SCTP_INITIATION:
4835                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4836                         /* The INIT chunk must be the only chunk. */
4837                         if ((num_chunks > 1) ||
4838                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4839                                 /* RFC 4960 requires that no ABORT is sent */
4840                                 *offset = length;
4841                                 if (stcb != NULL) {
4842                                         SCTP_TCB_UNLOCK(stcb);
4843                                 }
4844                                 return (NULL);
4845                         }
4846                         /* Honor our resource limit. */
4847                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4848                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4849                                 sctp_abort_association(inp, stcb, m, iphlen,
4850                                     src, dst, sh, op_err,
4851                                     mflowtype, mflowid,
4852                                     vrf_id, port);
4853                                 *offset = length;
4854                                 return (NULL);
4855                         }
4856                         sctp_handle_init(m, iphlen, *offset, src, dst, sh,
4857                             (struct sctp_init_chunk *)ch, inp,
4858                             stcb, *netp, &abort_no_unlock,
4859                             mflowtype, mflowid,
4860                             vrf_id, port);
4861                         *offset = length;
4862                         if ((!abort_no_unlock) && (stcb != NULL)) {
4863                                 SCTP_TCB_UNLOCK(stcb);
4864                         }
4865                         return (NULL);
4866                         break;
4867                 case SCTP_PAD_CHUNK:
4868                         break;
4869                 case SCTP_INITIATION_ACK:
4870                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n");
4871                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4872                                 /* We are not interested anymore */
4873                                 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) {
4874                                         ;
4875                                 } else {
4876                                         *offset = length;
4877                                         if (stcb != NULL) {
4878 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4879                                                 so = SCTP_INP_SO(inp);
4880                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4881                                                 SCTP_TCB_UNLOCK(stcb);
4882                                                 SCTP_SOCKET_LOCK(so, 1);
4883                                                 SCTP_TCB_LOCK(stcb);
4884                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4885 #endif
4886                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
4887                                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
4888 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4889                                                 SCTP_SOCKET_UNLOCK(so, 1);
4890 #endif
4891                                         }
4892                                         return (NULL);
4893                                 }
4894                         }
4895                         /* The INIT-ACK chunk must be the only chunk. */
4896                         if ((num_chunks > 1) ||
4897                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4898                                 *offset = length;
4899                                 return (stcb);
4900                         }
4901                         if ((netp != NULL) && (*netp != NULL)) {
4902                                 ret = sctp_handle_init_ack(m, iphlen, *offset,
4903                                     src, dst, sh,
4904                                     (struct sctp_init_ack_chunk *)ch,
4905                                     stcb, *netp,
4906                                     &abort_no_unlock,
4907                                     mflowtype, mflowid,
4908                                     vrf_id);
4909                         } else {
4910                                 ret = -1;
4911                         }
4912                         *offset = length;
4913                         if (abort_no_unlock) {
4914                                 return (NULL);
4915                         }
4916                         /*
4917                          * Special case, I must call the output routine to
4918                          * get the cookie echoed
4919                          */
4920                         if ((stcb != NULL) && (ret == 0)) {
4921                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4922                         }
4923                         return (stcb);
4924                         break;
4925                 case SCTP_SELECTIVE_ACK:
4926                 case SCTP_NR_SELECTIVE_ACK:
4927                         {
4928                                 int abort_now = 0;
4929                                 uint32_t a_rwnd, cum_ack;
4930                                 uint16_t num_seg, num_nr_seg, num_dup;
4931                                 uint8_t flags;
4932                                 int offset_seg, offset_dup;
4933
4934                                 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n",
4935                                     ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK");
4936                                 SCTP_STAT_INCR(sctps_recvsacks);
4937                                 if (stcb == NULL) {
4938                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n",
4939                                             (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK");
4940                                         break;
4941                                 }
4942                                 if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
4943                                         if (chk_length < sizeof(struct sctp_sack_chunk)) {
4944                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4945                                                 break;
4946                                         }
4947                                 } else {
4948                                         if (stcb->asoc.nrsack_supported == 0) {
4949                                                 goto unknown_chunk;
4950                                         }
4951                                         if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
4952                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n");
4953                                                 break;
4954                                         }
4955                                 }
4956                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4957                                         /*-
4958                                          * If we have sent a shutdown-ack, we will pay no
4959                                          * attention to a sack sent in to us since
4960                                          * we don't care anymore.
4961                                          */
4962                                         break;
4963                                 }
4964                                 flags = ch->chunk_flags;
4965                                 if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
4966                                         struct sctp_sack_chunk *sack;
4967
4968                                         sack = (struct sctp_sack_chunk *)ch;
4969                                         cum_ack = ntohl(sack->sack.cum_tsn_ack);
4970                                         num_seg = ntohs(sack->sack.num_gap_ack_blks);
4971                                         num_nr_seg = 0;
4972                                         num_dup = ntohs(sack->sack.num_dup_tsns);
4973                                         a_rwnd = ntohl(sack->sack.a_rwnd);
4974                                         if (sizeof(struct sctp_sack_chunk) +
4975                                             num_seg * sizeof(struct sctp_gap_ack_block) +
4976                                             num_dup * sizeof(uint32_t) != chk_length) {
4977                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4978                                                 break;
4979                                         }
4980                                         offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4981                                         offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4982                                 } else {
4983                                         struct sctp_nr_sack_chunk *nr_sack;
4984
4985                                         nr_sack = (struct sctp_nr_sack_chunk *)ch;
4986                                         cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
4987                                         num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
4988                                         num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
4989                                         num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
4990                                         a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd);
4991                                         if (sizeof(struct sctp_nr_sack_chunk) +
4992                                             (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
4993                                             num_dup * sizeof(uint32_t) != chk_length) {
4994                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
4995                                                 break;
4996                                         }
4997                                         offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
4998                                         offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block);
4999                                 }
5000                                 SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n",
5001                                     (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK",
5002                                     cum_ack, num_seg, a_rwnd);
5003                                 stcb->asoc.seen_a_sack_this_pkt = 1;
5004                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
5005                                     (num_seg == 0) && (num_nr_seg == 0) &&
5006                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
5007                                     (stcb->asoc.saw_sack_with_frags == 0) &&
5008                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
5009                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
5010                                         /*
5011                                          * We have a SIMPLE sack having no
5012                                          * prior segments and data on sent
5013                                          * queue to be acked. Use the faster
5014                                          * path sack processing. We also
5015                                          * allow window update sacks with no
5016                                          * missing segments to go this way
5017                                          * too.
5018                                          */
5019                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
5020                                             &abort_now, ecne_seen);
5021                                 } else {
5022                                         if ((netp != NULL) && (*netp != NULL)) {
5023                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
5024                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
5025                                                     cum_ack, a_rwnd, ecne_seen);
5026                                         }
5027                                 }
5028                                 if (abort_now) {
5029                                         /* ABORT signal from sack processing */
5030                                         *offset = length;
5031                                         return (NULL);
5032                                 }
5033                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
5034                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
5035                                     (stcb->asoc.stream_queue_cnt == 0)) {
5036                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
5037                                 }
5038                                 break;
5039                         }
5040                 case SCTP_HEARTBEAT_REQUEST:
5041                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
5042                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5043                                 SCTP_STAT_INCR(sctps_recvheartbeat);
5044                                 sctp_send_heartbeat_ack(stcb, m, *offset,
5045                                     chk_length, *netp);
5046                         }
5047                         break;
5048                 case SCTP_HEARTBEAT_ACK:
5049                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n");
5050                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
5051                                 /* Its not ours */
5052                                 *offset = length;
5053                                 return (stcb);
5054                         }
5055                         SCTP_STAT_INCR(sctps_recvheartbeatack);
5056                         if ((netp != NULL) && (*netp != NULL)) {
5057                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
5058                                     stcb, *netp);
5059                         }
5060                         break;
5061                 case SCTP_ABORT_ASSOCIATION:
5062                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
5063                             (void *)stcb);
5064                         *offset = length;
5065                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5066                                 if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) {
5067                                         return (NULL);
5068                                 } else {
5069                                         return (stcb);
5070                                 }
5071                         } else {
5072                                 return (NULL);
5073                         }
5074                         break;
5075                 case SCTP_SHUTDOWN:
5076                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
5077                             (void *)stcb);
5078                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
5079                                 *offset = length;
5080                                 return (stcb);
5081                         }
5082                         if ((netp != NULL) && (*netp != NULL)) {
5083                                 int abort_flag = 0;
5084
5085                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
5086                                     stcb, *netp, &abort_flag);
5087                                 if (abort_flag) {
5088                                         *offset = length;
5089                                         return (NULL);
5090                                 }
5091                         }
5092                         break;
5093                 case SCTP_SHUTDOWN_ACK:
5094                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb);
5095                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5096                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
5097                         }
5098                         *offset = length;
5099                         return (NULL);
5100                         break;
5101                 case SCTP_OPERATION_ERROR:
5102                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n");
5103                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) &&
5104                             sctp_handle_error(ch, stcb, *netp, contiguous) < 0) {
5105                                 *offset = length;
5106                                 return (NULL);
5107                         }
5108                         break;
5109                 case SCTP_COOKIE_ECHO:
5110                         SCTPDBG(SCTP_DEBUG_INPUT3,
5111                             "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb);
5112                         if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) {
5113                                 ;
5114                         } else {
5115                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5116                                         /* We are not interested anymore */
5117                         abend:
5118                                         if (stcb != NULL) {
5119                                                 SCTP_TCB_UNLOCK(stcb);
5120                                         }
5121                                         *offset = length;
5122                                         return (NULL);
5123                                 }
5124                         }
5125                         /*
5126                          * First are we accepting? We do this again here
5127                          * since it is possible that a previous endpoint WAS
5128                          * listening responded to a INIT-ACK and then
5129                          * closed. We opened and bound.. and are now no
5130                          * longer listening.
5131                          */
5132
5133                         if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) {
5134                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
5135                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
5136                                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
5137                                         sctp_abort_association(inp, stcb, m, iphlen,
5138                                             src, dst, sh, op_err,
5139                                             mflowtype, mflowid,
5140                                             vrf_id, port);
5141                                 }
5142                                 *offset = length;
5143                                 return (NULL);
5144                         } else {
5145                                 struct mbuf *ret_buf;
5146                                 struct sctp_inpcb *linp;
5147
5148                                 if (stcb) {
5149                                         linp = NULL;
5150                                 } else {
5151                                         linp = inp;
5152                                 }
5153
5154                                 if (linp != NULL) {
5155                                         SCTP_ASOC_CREATE_LOCK(linp);
5156                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
5157                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
5158                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
5159                                                 goto abend;
5160                                         }
5161                                 }
5162
5163                                 if (netp != NULL) {
5164                                         struct sctp_tcb *locked_stcb;
5165
5166                                         locked_stcb = stcb;
5167                                         ret_buf =
5168                                             sctp_handle_cookie_echo(m, iphlen,
5169                                             *offset,
5170                                             src, dst,
5171                                             sh,
5172                                             (struct sctp_cookie_echo_chunk *)ch,
5173                                             &inp, &stcb, netp,
5174                                             auth_skipped,
5175                                             auth_offset,
5176                                             auth_len,
5177                                             &locked_stcb,
5178                                             mflowtype,
5179                                             mflowid,
5180                                             vrf_id,
5181                                             port);
5182                                         if ((locked_stcb != NULL) && (locked_stcb != stcb)) {
5183                                                 SCTP_TCB_UNLOCK(locked_stcb);
5184                                         }
5185                                         if (stcb != NULL) {
5186                                                 SCTP_TCB_LOCK_ASSERT(stcb);
5187                                         }
5188                                 } else {
5189                                         ret_buf = NULL;
5190                                 }
5191                                 if (linp != NULL) {
5192                                         SCTP_ASOC_CREATE_UNLOCK(linp);
5193                                 }
5194                                 if (ret_buf == NULL) {
5195                                         if (stcb != NULL) {
5196                                                 SCTP_TCB_UNLOCK(stcb);
5197                                         }
5198                                         SCTPDBG(SCTP_DEBUG_INPUT3,
5199                                             "GAK, null buffer\n");
5200                                         *offset = length;
5201                                         return (NULL);
5202                                 }
5203                                 /* if AUTH skipped, see if it verified... */
5204                                 if (auth_skipped) {
5205                                         got_auth = 1;
5206                                         auth_skipped = 0;
5207                                 }
5208                                 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
5209                                         /*
5210                                          * Restart the timer if we have
5211                                          * pending data
5212                                          */
5213                                         struct sctp_tmit_chunk *chk;
5214
5215                                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
5216                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
5217                                 }
5218                         }
5219                         break;
5220                 case SCTP_COOKIE_ACK:
5221                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb);
5222                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5223                                 return (stcb);
5224                         }
5225                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5226                                 /* We are not interested anymore */
5227                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5228                                         ;
5229                                 } else if (stcb) {
5230 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5231                                         so = SCTP_INP_SO(inp);
5232                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5233                                         SCTP_TCB_UNLOCK(stcb);
5234                                         SCTP_SOCKET_LOCK(so, 1);
5235                                         SCTP_TCB_LOCK(stcb);
5236                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5237 #endif
5238                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5239                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
5240 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5241                                         SCTP_SOCKET_UNLOCK(so, 1);
5242 #endif
5243                                         *offset = length;
5244                                         return (NULL);
5245                                 }
5246                         }
5247                         if ((netp != NULL) && (*netp != NULL)) {
5248                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
5249                         }
5250                         break;
5251                 case SCTP_ECN_ECHO:
5252                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n");
5253                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5254                                 /* Its not ours */
5255                                 *offset = length;
5256                                 return (stcb);
5257                         }
5258                         if (stcb->asoc.ecn_supported == 0) {
5259                                 goto unknown_chunk;
5260                         }
5261                         sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb);
5262                         ecne_seen = 1;
5263                         break;
5264                 case SCTP_ECN_CWR:
5265                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n");
5266                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5267                                 *offset = length;
5268                                 return (stcb);
5269                         }
5270                         if (stcb->asoc.ecn_supported == 0) {
5271                                 goto unknown_chunk;
5272                         }
5273                         sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5274                         break;
5275                 case SCTP_SHUTDOWN_COMPLETE:
5276                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb);
5277                         /* must be first and only chunk */
5278                         if ((num_chunks > 1) ||
5279                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5280                                 *offset = length;
5281                                 return (stcb);
5282                         }
5283                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5284                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5285                                     stcb, *netp);
5286                         }
5287                         *offset = length;
5288                         return (NULL);
5289                         break;
5290                 case SCTP_ASCONF:
5291                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5292                         if (stcb != NULL) {
5293                                 if (stcb->asoc.asconf_supported == 0) {
5294                                         goto unknown_chunk;
5295                                 }
5296                                 sctp_handle_asconf(m, *offset, src,
5297                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5298                                 asconf_cnt++;
5299                         }
5300                         break;
5301                 case SCTP_ASCONF_ACK:
5302                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n");
5303                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5304                                 /* Its not ours */
5305                                 *offset = length;
5306                                 return (stcb);
5307                         }
5308                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5309                                 if (stcb->asoc.asconf_supported == 0) {
5310                                         goto unknown_chunk;
5311                                 }
5312                                 /* He's alive so give him credit */
5313                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5314                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5315                                             stcb->asoc.overall_error_count,
5316                                             0,
5317                                             SCTP_FROM_SCTP_INPUT,
5318                                             __LINE__);
5319                                 }
5320                                 stcb->asoc.overall_error_count = 0;
5321                                 sctp_handle_asconf_ack(m, *offset,
5322                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5323                                 if (abort_no_unlock)
5324                                         return (NULL);
5325                         }
5326                         break;
5327                 case SCTP_FORWARD_CUM_TSN:
5328                 case SCTP_IFORWARD_CUM_TSN:
5329                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD_TSN\n");
5330                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5331                                 /* Its not ours */
5332                                 *offset = length;
5333                                 return (stcb);
5334                         }
5335
5336                         if (stcb != NULL) {
5337                                 int abort_flag = 0;
5338
5339                                 if (stcb->asoc.prsctp_supported == 0) {
5340                                         goto unknown_chunk;
5341                                 }
5342                                 *fwd_tsn_seen = 1;
5343                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5344                                         /* We are not interested anymore */
5345 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5346                                         so = SCTP_INP_SO(inp);
5347                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5348                                         SCTP_TCB_UNLOCK(stcb);
5349                                         SCTP_SOCKET_LOCK(so, 1);
5350                                         SCTP_TCB_LOCK(stcb);
5351                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5352 #endif
5353                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5354                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_31);
5355 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5356                                         SCTP_SOCKET_UNLOCK(so, 1);
5357 #endif
5358                                         *offset = length;
5359                                         return (NULL);
5360                                 }
5361                                 /*
5362                                  * For sending a SACK this looks like DATA
5363                                  * chunks.
5364                                  */
5365                                 stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from;
5366                                 sctp_handle_forward_tsn(stcb,
5367                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5368                                 if (abort_flag) {
5369                                         *offset = length;
5370                                         return (NULL);
5371                                 }
5372                         }
5373                         break;
5374                 case SCTP_STREAM_RESET:
5375                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5376                         if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
5377                                 /* Its not ours */
5378                                 *offset = length;
5379                                 return (stcb);
5380                         }
5381                         if (stcb->asoc.reconfig_supported == 0) {
5382                                 goto unknown_chunk;
5383                         }
5384                         if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5385                                 /* stop processing */
5386                                 *offset = length;
5387                                 return (NULL);
5388                         }
5389                         break;
5390                 case SCTP_PACKET_DROPPED:
5391                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5392                         /* re-get it all please */
5393                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5394                                 /* Its not ours */
5395                                 *offset = length;
5396                                 return (stcb);
5397                         }
5398
5399                         if ((ch != NULL) && (stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5400                                 if (stcb->asoc.pktdrop_supported == 0) {
5401                                         goto unknown_chunk;
5402                                 }
5403                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5404                                     stcb, *netp,
5405                                     min(chk_length, contiguous));
5406                         }
5407                         break;
5408                 case SCTP_AUTHENTICATION:
5409                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5410                         if (stcb == NULL) {
5411                                 /* save the first AUTH for later processing */
5412                                 if (auth_skipped == 0) {
5413                                         auth_offset = *offset;
5414                                         auth_len = chk_length;
5415                                         auth_skipped = 1;
5416                                 }
5417                                 /* skip this chunk (temporarily) */
5418                                 goto next_chunk;
5419                         }
5420                         if (stcb->asoc.auth_supported == 0) {
5421                                 goto unknown_chunk;
5422                         }
5423                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5424                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5425                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5426                                 /* Its not ours */
5427                                 *offset = length;
5428                                 return (stcb);
5429                         }
5430                         if (got_auth == 1) {
5431                                 /* skip this chunk... it's already auth'd */
5432                                 goto next_chunk;
5433                         }
5434                         got_auth = 1;
5435                         if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
5436                             m, *offset)) {
5437                                 /* auth HMAC failed so dump the packet */
5438                                 *offset = length;
5439                                 return (stcb);
5440                         } else {
5441                                 /* remaining chunks are HMAC checked */
5442                                 stcb->asoc.authenticated = 1;
5443                         }
5444                         break;
5445
5446                 default:
5447         unknown_chunk:
5448                         /* it's an unknown chunk! */
5449                         if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
5450                                 struct sctp_gen_error_cause *cause;
5451                                 int len;
5452
5453                                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause),
5454                                     0, M_NOWAIT, 1, MT_DATA);
5455                                 if (op_err != NULL) {
5456                                         len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset));
5457                                         cause = mtod(op_err, struct sctp_gen_error_cause *);
5458                                         cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5459                                         cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause)));
5460                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5461                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
5462                                         if (SCTP_BUF_NEXT(op_err) != NULL) {
5463 #ifdef SCTP_MBUF_LOGGING
5464                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5465                                                         sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY);
5466                                                 }
5467 #endif
5468                                                 sctp_queue_op_err(stcb, op_err);
5469                                         } else {
5470                                                 sctp_m_freem(op_err);
5471                                         }
5472                                 }
5473                         }
5474                         if ((ch->chunk_type & 0x80) == 0) {
5475                                 /* discard this packet */
5476                                 *offset = length;
5477                                 return (stcb);
5478                         }       /* else skip this bad chunk and continue... */
5479                         break;
5480                 }               /* switch (ch->chunk_type) */
5481
5482
5483 next_chunk:
5484                 /* get the next chunk */
5485                 *offset += SCTP_SIZE32(chk_length);
5486                 if (*offset >= length) {
5487                         /* no more data left in the mbuf chain */
5488                         break;
5489                 }
5490                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5491                     sizeof(struct sctp_chunkhdr), chunk_buf);
5492                 if (ch == NULL) {
5493                         *offset = length;
5494                         return (stcb);
5495                 }
5496         }                       /* while */
5497
5498         if ((asconf_cnt > 0) && (stcb != NULL)) {
5499                 sctp_send_asconf_ack(stcb);
5500         }
5501         return (stcb);
5502 }
5503
5504
5505 /*
5506  * common input chunk processing (v4 and v6)
5507  */
5508 void
5509 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5510     struct sockaddr *src, struct sockaddr *dst,
5511     struct sctphdr *sh, struct sctp_chunkhdr *ch,
5512     uint8_t compute_crc,
5513     uint8_t ecn_bits,
5514     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
5515     uint32_t vrf_id, uint16_t port)
5516 {
5517         uint32_t high_tsn;
5518         int fwd_tsn_seen = 0, data_processed = 0;
5519         struct mbuf *m = *mm, *op_err;
5520         char msg[SCTP_DIAG_INFO_LEN];
5521         int un_sent;
5522         int cnt_ctrl_ready = 0;
5523         struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5524         struct sctp_tcb *stcb = NULL;
5525         struct sctp_nets *net = NULL;
5526
5527         SCTP_STAT_INCR(sctps_recvdatagrams);
5528 #ifdef SCTP_AUDITING_ENABLED
5529         sctp_audit_log(0xE0, 1);
5530         sctp_auditing(0, inp, stcb, net);
5531 #endif
5532         if (compute_crc != 0) {
5533                 uint32_t check, calc_check;
5534
5535                 check = sh->checksum;
5536                 sh->checksum = 0;
5537                 calc_check = sctp_calculate_cksum(m, iphlen);
5538                 sh->checksum = check;
5539                 if (calc_check != check) {
5540                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5541                             calc_check, check, (void *)m, length, iphlen);
5542                         stcb = sctp_findassociation_addr(m, offset, src, dst,
5543                             sh, ch, &inp, &net, vrf_id);
5544 #if defined(INET) || defined(INET6)
5545                         if ((ch->chunk_type != SCTP_INITIATION) &&
5546                             (net != NULL) && (net->port != port)) {
5547                                 if (net->port == 0) {
5548                                         /* UDP encapsulation turned on. */
5549                                         net->mtu -= sizeof(struct udphdr);
5550                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5551                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5552                                         }
5553                                 } else if (port == 0) {
5554                                         /* UDP encapsulation turned off. */
5555                                         net->mtu += sizeof(struct udphdr);
5556                                         /* XXX Update smallest_mtu */
5557                                 }
5558                                 net->port = port;
5559                         }
5560 #endif
5561                         if (net != NULL) {
5562                                 net->flowtype = mflowtype;
5563                                 net->flowid = mflowid;
5564                         }
5565                         if ((inp != NULL) && (stcb != NULL)) {
5566                                 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5567                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5568                         } else if ((inp != NULL) && (stcb == NULL)) {
5569                                 inp_decr = inp;
5570                         }
5571                         SCTP_STAT_INCR(sctps_badsum);
5572                         SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5573                         goto out;
5574                 }
5575         }
5576         /* Destination port of 0 is illegal, based on RFC4960. */
5577         if (sh->dest_port == 0) {
5578                 SCTP_STAT_INCR(sctps_hdrops);
5579                 goto out;
5580         }
5581         stcb = sctp_findassociation_addr(m, offset, src, dst,
5582             sh, ch, &inp, &net, vrf_id);
5583 #if defined(INET) || defined(INET6)
5584         if ((ch->chunk_type != SCTP_INITIATION) &&
5585             (net != NULL) && (net->port != port)) {
5586                 if (net->port == 0) {
5587                         /* UDP encapsulation turned on. */
5588                         net->mtu -= sizeof(struct udphdr);
5589                         if (stcb->asoc.smallest_mtu > net->mtu) {
5590                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5591                         }
5592                 } else if (port == 0) {
5593                         /* UDP encapsulation turned off. */
5594                         net->mtu += sizeof(struct udphdr);
5595                         /* XXX Update smallest_mtu */
5596                 }
5597                 net->port = port;
5598         }
5599 #endif
5600         if (net != NULL) {
5601                 net->flowtype = mflowtype;
5602                 net->flowid = mflowid;
5603         }
5604         if (inp == NULL) {
5605                 SCTP_STAT_INCR(sctps_noport);
5606                 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5607                         goto out;
5608                 }
5609                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5610                         sctp_send_shutdown_complete2(src, dst, sh,
5611                             mflowtype, mflowid, fibnum,
5612                             vrf_id, port);
5613                         goto out;
5614                 }
5615                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5616                         goto out;
5617                 }
5618                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5619                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5620                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5621                             (ch->chunk_type != SCTP_INIT))) {
5622                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5623                                     "Out of the blue");
5624                                 sctp_send_abort(m, iphlen, src, dst,
5625                                     sh, 0, op_err,
5626                                     mflowtype, mflowid, fibnum,
5627                                     vrf_id, port);
5628                         }
5629                 }
5630                 goto out;
5631         } else if (stcb == NULL) {
5632                 inp_decr = inp;
5633         }
5634         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5635             (void *)m, iphlen, offset, length, (void *)stcb);
5636         if (stcb) {
5637                 /* always clear this before beginning a packet */
5638                 stcb->asoc.authenticated = 0;
5639                 stcb->asoc.seen_a_sack_this_pkt = 0;
5640                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5641                     (void *)stcb, stcb->asoc.state);
5642
5643                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5644                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5645                         /*-
5646                          * If we hit here, we had a ref count
5647                          * up when the assoc was aborted and the
5648                          * timer is clearing out the assoc, we should
5649                          * NOT respond to any packet.. its OOTB.
5650                          */
5651                         SCTP_TCB_UNLOCK(stcb);
5652                         stcb = NULL;
5653                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5654                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5655                             msg);
5656                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5657                             mflowtype, mflowid, inp->fibnum,
5658                             vrf_id, port);
5659                         goto out;
5660                 }
5661
5662         }
5663         if (IS_SCTP_CONTROL(ch)) {
5664                 /* process the control portion of the SCTP packet */
5665                 /* sa_ignore NO_NULL_CHK */
5666                 stcb = sctp_process_control(m, iphlen, &offset, length,
5667                     src, dst, sh, ch,
5668                     inp, stcb, &net, &fwd_tsn_seen,
5669                     mflowtype, mflowid, fibnum,
5670                     vrf_id, port);
5671                 if (stcb) {
5672                         /*
5673                          * This covers us if the cookie-echo was there and
5674                          * it changes our INP.
5675                          */
5676                         inp = stcb->sctp_ep;
5677 #if defined(INET) || defined(INET6)
5678                         if ((ch->chunk_type != SCTP_INITIATION) &&
5679                             (net != NULL) && (net->port != port)) {
5680                                 if (net->port == 0) {
5681                                         /* UDP encapsulation turned on. */
5682                                         net->mtu -= sizeof(struct udphdr);
5683                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5684                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5685                                         }
5686                                 } else if (port == 0) {
5687                                         /* UDP encapsulation turned off. */
5688                                         net->mtu += sizeof(struct udphdr);
5689                                         /* XXX Update smallest_mtu */
5690                                 }
5691                                 net->port = port;
5692                         }
5693 #endif
5694                 }
5695         } else {
5696                 /*
5697                  * no control chunks, so pre-process DATA chunks (these
5698                  * checks are taken care of by control processing)
5699                  */
5700
5701                 /*
5702                  * if DATA only packet, and auth is required, then punt...
5703                  * can't have authenticated without any AUTH (control)
5704                  * chunks
5705                  */
5706                 if ((stcb != NULL) &&
5707                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5708                         /* "silently" ignore */
5709                         SCTP_STAT_INCR(sctps_recvauthmissing);
5710                         goto out;
5711                 }
5712                 if (stcb == NULL) {
5713                         /* out of the blue DATA chunk */
5714                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5715                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5716                             msg);
5717                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5718                             mflowtype, mflowid, fibnum,
5719                             vrf_id, port);
5720                         goto out;
5721                 }
5722                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5723                         /* v_tag mismatch! */
5724                         SCTP_STAT_INCR(sctps_badvtag);
5725                         goto out;
5726                 }
5727         }
5728
5729         if (stcb == NULL) {
5730                 /*
5731                  * no valid TCB for this packet, or we found it's a bad
5732                  * packet while processing control, or we're done with this
5733                  * packet (done or skip rest of data), so we drop it...
5734                  */
5735                 goto out;
5736         }
5737
5738         /*
5739          * DATA chunk processing
5740          */
5741         /* plow through the data chunks while length > offset */
5742
5743         /*
5744          * Rest should be DATA only.  Check authentication state if AUTH for
5745          * DATA is required.
5746          */
5747         if ((length > offset) &&
5748             (stcb != NULL) &&
5749             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5750             !stcb->asoc.authenticated) {
5751                 /* "silently" ignore */
5752                 SCTP_STAT_INCR(sctps_recvauthmissing);
5753                 SCTPDBG(SCTP_DEBUG_AUTH1,
5754                     "Data chunk requires AUTH, skipped\n");
5755                 goto trigger_send;
5756         }
5757         if (length > offset) {
5758                 int retval;
5759
5760                 /*
5761                  * First check to make sure our state is correct. We would
5762                  * not get here unless we really did have a tag, so we don't
5763                  * abort if this happens, just dump the chunk silently.
5764                  */
5765                 switch (SCTP_GET_STATE(stcb)) {
5766                 case SCTP_STATE_COOKIE_ECHOED:
5767                         /*
5768                          * we consider data with valid tags in this state
5769                          * shows us the cookie-ack was lost. Imply it was
5770                          * there.
5771                          */
5772                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5773                         break;
5774                 case SCTP_STATE_COOKIE_WAIT:
5775                         /*
5776                          * We consider OOTB any data sent during asoc setup.
5777                          */
5778                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5779                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5780                             msg);
5781                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5782                             mflowtype, mflowid, inp->fibnum,
5783                             vrf_id, port);
5784                         goto out;
5785                         /* sa_ignore NOTREACHED */
5786                         break;
5787                 case SCTP_STATE_EMPTY:  /* should not happen */
5788                 case SCTP_STATE_INUSE:  /* should not happen */
5789                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5790                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5791                 default:
5792                         goto out;
5793                         /* sa_ignore NOTREACHED */
5794                         break;
5795                 case SCTP_STATE_OPEN:
5796                 case SCTP_STATE_SHUTDOWN_SENT:
5797                         break;
5798                 }
5799                 /* plow through the data chunks while length > offset */
5800                 retval = sctp_process_data(mm, iphlen, &offset, length,
5801                     inp, stcb, net, &high_tsn);
5802                 if (retval == 2) {
5803                         /*
5804                          * The association aborted, NO UNLOCK needed since
5805                          * the association is destroyed.
5806                          */
5807                         stcb = NULL;
5808                         goto out;
5809                 }
5810                 data_processed = 1;
5811                 /*
5812                  * Anything important needs to have been m_copy'ed in
5813                  * process_data
5814                  */
5815         }
5816
5817         /* take care of ecn */
5818         if ((data_processed == 1) &&
5819             (stcb->asoc.ecn_supported == 1) &&
5820             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5821                 /* Yep, we need to add a ECNE */
5822                 sctp_send_ecn_echo(stcb, net, high_tsn);
5823         }
5824
5825         if ((data_processed == 0) && (fwd_tsn_seen)) {
5826                 int was_a_gap;
5827                 uint32_t highest_tsn;
5828
5829                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
5830                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
5831                 } else {
5832                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
5833                 }
5834                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
5835                 stcb->asoc.send_sack = 1;
5836                 sctp_sack_check(stcb, was_a_gap);
5837         } else if (fwd_tsn_seen) {
5838                 stcb->asoc.send_sack = 1;
5839         }
5840         /* trigger send of any chunks in queue... */
5841 trigger_send:
5842 #ifdef SCTP_AUDITING_ENABLED
5843         sctp_audit_log(0xE0, 2);
5844         sctp_auditing(1, inp, stcb, net);
5845 #endif
5846         SCTPDBG(SCTP_DEBUG_INPUT1,
5847             "Check for chunk output prw:%d tqe:%d tf=%d\n",
5848             stcb->asoc.peers_rwnd,
5849             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
5850             stcb->asoc.total_flight);
5851         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
5852         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
5853                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
5854         }
5855         if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) ||
5856             cnt_ctrl_ready ||
5857             stcb->asoc.trigger_reset ||
5858             ((un_sent) &&
5859             (stcb->asoc.peers_rwnd > 0 ||
5860             (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
5861                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
5862                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5863                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
5864         }
5865 #ifdef SCTP_AUDITING_ENABLED
5866         sctp_audit_log(0xE0, 3);
5867         sctp_auditing(2, inp, stcb, net);
5868 #endif
5869 out:
5870         if (stcb != NULL) {
5871                 SCTP_TCB_UNLOCK(stcb);
5872         }
5873         if (inp_decr != NULL) {
5874                 /* reduce ref-count */
5875                 SCTP_INP_WLOCK(inp_decr);
5876                 SCTP_INP_DECR_REF(inp_decr);
5877                 SCTP_INP_WUNLOCK(inp_decr);
5878         }
5879         return;
5880 }
5881
5882 #ifdef INET
5883 void
5884 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
5885 {
5886         struct mbuf *m;
5887         int iphlen;
5888         uint32_t vrf_id = 0;
5889         uint8_t ecn_bits;
5890         struct sockaddr_in src, dst;
5891         struct ip *ip;
5892         struct sctphdr *sh;
5893         struct sctp_chunkhdr *ch;
5894         int length, offset;
5895         uint8_t compute_crc;
5896         uint32_t mflowid;
5897         uint8_t mflowtype;
5898         uint16_t fibnum;
5899
5900         iphlen = off;
5901         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
5902                 SCTP_RELEASE_PKT(i_pak);
5903                 return;
5904         }
5905         m = SCTP_HEADER_TO_CHAIN(i_pak);
5906 #ifdef SCTP_MBUF_LOGGING
5907         /* Log in any input mbufs */
5908         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5909                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
5910         }
5911 #endif
5912 #ifdef SCTP_PACKET_LOGGING
5913         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
5914                 sctp_packet_log(m);
5915         }
5916 #endif
5917         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
5918             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
5919             m->m_pkthdr.len,
5920             if_name(m->m_pkthdr.rcvif),
5921             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
5922         mflowid = m->m_pkthdr.flowid;
5923         mflowtype = M_HASHTYPE_GET(m);
5924         fibnum = M_GETFIB(m);
5925         SCTP_STAT_INCR(sctps_recvpackets);
5926         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
5927         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
5928         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5929         if (SCTP_BUF_LEN(m) < offset) {
5930                 if ((m = m_pullup(m, offset)) == NULL) {
5931                         SCTP_STAT_INCR(sctps_hdrops);
5932                         return;
5933                 }
5934         }
5935         ip = mtod(m, struct ip *);
5936         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
5937         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
5938         offset -= sizeof(struct sctp_chunkhdr);
5939         memset(&src, 0, sizeof(struct sockaddr_in));
5940         src.sin_family = AF_INET;
5941         src.sin_len = sizeof(struct sockaddr_in);
5942         src.sin_port = sh->src_port;
5943         src.sin_addr = ip->ip_src;
5944         memset(&dst, 0, sizeof(struct sockaddr_in));
5945         dst.sin_family = AF_INET;
5946         dst.sin_len = sizeof(struct sockaddr_in);
5947         dst.sin_port = sh->dest_port;
5948         dst.sin_addr = ip->ip_dst;
5949         length = ntohs(ip->ip_len);
5950         /* Validate mbuf chain length with IP payload length. */
5951         if (SCTP_HEADER_LEN(m) != length) {
5952                 SCTPDBG(SCTP_DEBUG_INPUT1,
5953                     "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
5954                 SCTP_STAT_INCR(sctps_hdrops);
5955                 goto out;
5956         }
5957         /* SCTP does not allow broadcasts or multicasts */
5958         if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
5959                 goto out;
5960         }
5961         if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
5962                 goto out;
5963         }
5964         ecn_bits = ip->ip_tos;
5965         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
5966                 SCTP_STAT_INCR(sctps_recvhwcrc);
5967                 compute_crc = 0;
5968         } else {
5969                 SCTP_STAT_INCR(sctps_recvswcrc);
5970                 compute_crc = 1;
5971         }
5972         sctp_common_input_processing(&m, iphlen, offset, length,
5973             (struct sockaddr *)&src,
5974             (struct sockaddr *)&dst,
5975             sh, ch,
5976             compute_crc,
5977             ecn_bits,
5978             mflowtype, mflowid, fibnum,
5979             vrf_id, port);
5980 out:
5981         if (m) {
5982                 sctp_m_freem(m);
5983         }
5984         return;
5985 }
5986
5987 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
5988 extern int *sctp_cpuarry;
5989 #endif
5990
5991 int
5992 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED)
5993 {
5994         struct mbuf *m;
5995         int off;
5996
5997         m = *mp;
5998         off = *offp;
5999 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6000         if (mp_ncpus > 1) {
6001                 struct ip *ip;
6002                 struct sctphdr *sh;
6003                 int offset;
6004                 int cpu_to_use;
6005                 uint32_t flowid, tag;
6006
6007                 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
6008                         flowid = m->m_pkthdr.flowid;
6009                 } else {
6010                         /*
6011                          * No flow id built by lower layers fix it so we
6012                          * create one.
6013                          */
6014                         offset = off + sizeof(struct sctphdr);
6015                         if (SCTP_BUF_LEN(m) < offset) {
6016                                 if ((m = m_pullup(m, offset)) == NULL) {
6017                                         SCTP_STAT_INCR(sctps_hdrops);
6018                                         return (IPPROTO_DONE);
6019                                 }
6020                         }
6021                         ip = mtod(m, struct ip *);
6022                         sh = (struct sctphdr *)((caddr_t)ip + off);
6023                         tag = htonl(sh->v_tag);
6024                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
6025                         m->m_pkthdr.flowid = flowid;
6026                         M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH);
6027                 }
6028                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
6029                 sctp_queue_to_mcore(m, off, cpu_to_use);
6030                 return (IPPROTO_DONE);
6031         }
6032 #endif
6033         sctp_input_with_port(m, off, 0);
6034         return (IPPROTO_DONE);
6035 }
6036 #endif