sys/netinet/sctp_input.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   5  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   6  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  * a) Redistributions of source code must retain the above copyright notice,
  12  *    this list of conditions and the following disclaimer.
  13  *
  14  * b) Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the distribution.
  17  *
  18  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  19  *    contributors may be used to endorse or promote products derived
  20  *    from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  24  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  32  * THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 __FBSDID("$FreeBSD$");
  37
  38 #include <netinet/sctp_os.h>
  39 #include <netinet/sctp_var.h>
  40 #include <netinet/sctp_sysctl.h>
  41 #include <netinet/sctp_pcb.h>
  42 #include <netinet/sctp_header.h>
  43 #include <netinet/sctputil.h>
  44 #include <netinet/sctp_output.h>
  45 #include <netinet/sctp_input.h>
  46 #include <netinet/sctp_auth.h>
  47 #include <netinet/sctp_indata.h>
  48 #include <netinet/sctp_asconf.h>
  49 #include <netinet/sctp_bsd_addr.h>
  50 #include <netinet/sctp_timer.h>
  51 #include <netinet/sctp_crc32.h>
  52 #if defined(INET) || defined(INET6)
  53 #include <netinet/udp.h>
  54 #endif
  55 #include <sys/smp.h>
  56
  57
  58
  59 static void
  60 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb)
  61 {
  62         struct sctp_nets *net;
  63
  64         /*
  65          * This now not only stops all cookie timers it also stops any INIT
  66          * timers as well. This will make sure that the timers are stopped
  67          * in all collision cases.
  68          */
  69         SCTP_TCB_LOCK_ASSERT(stcb);
  70         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
  71                 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) {
  72                         sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE,
  73                             stcb->sctp_ep,
  74                             stcb,
  75                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1);
  76                 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) {
  77                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT,
  78                             stcb->sctp_ep,
  79                             stcb,
  80                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2);
  81                 }
  82         }
  83 }
  84
  85 /* INIT handler */
  86 static void
  87 sctp_handle_init(struct mbuf *m, int iphlen, int offset,
  88     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
  89     struct sctp_init_chunk *cp, struct sctp_inpcb *inp,
  90     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_no_unlock,
  91     uint8_t mflowtype, uint32_t mflowid,
  92     uint32_t vrf_id, uint16_t port)
  93 {
  94         struct sctp_init *init;
  95         struct mbuf *op_err;
  96
  97         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
  98             (void *)stcb);
  99         if (stcb == NULL) {
 100                 SCTP_INP_RLOCK(inp);
 101         }
 102         /* validate length */
 103         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) {
 104                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 105                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 106                     mflowtype, mflowid,
 107                     vrf_id, port);
 108                 if (stcb)
 109                         *abort_no_unlock = 1;
 110                 goto outnow;
 111         }
 112         /* validate parameters */
 113         init = &cp->init;
 114         if (init->initiate_tag == 0) {
 115                 /* protocol error... send abort */
 116                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 117                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 118                     mflowtype, mflowid,
 119                     vrf_id, port);
 120                 if (stcb)
 121                         *abort_no_unlock = 1;
 122                 goto outnow;
 123         }
 124         if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) {
 125                 /* invalid parameter... send abort */
 126                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 127                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 128                     mflowtype, mflowid,
 129                     vrf_id, port);
 130                 if (stcb)
 131                         *abort_no_unlock = 1;
 132                 goto outnow;
 133         }
 134         if (init->num_inbound_streams == 0) {
 135                 /* protocol error... send abort */
 136                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 137                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 138                     mflowtype, mflowid,
 139                     vrf_id, port);
 140                 if (stcb)
 141                         *abort_no_unlock = 1;
 142                 goto outnow;
 143         }
 144         if (init->num_outbound_streams == 0) {
 145                 /* protocol error... send abort */
 146                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 147                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 148                     mflowtype, mflowid,
 149                     vrf_id, port);
 150                 if (stcb)
 151                         *abort_no_unlock = 1;
 152                 goto outnow;
 153         }
 154         if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
 155             offset + ntohs(cp->ch.chunk_length))) {
 156                 /* auth parameter(s) error... send abort */
 157                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 158                     "Problem with AUTH parameters");
 159                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 160                     mflowtype, mflowid,
 161                     vrf_id, port);
 162                 if (stcb)
 163                         *abort_no_unlock = 1;
 164                 goto outnow;
 165         }
 166         /* We are only accepting if we have a listening socket. */
 167         if ((stcb == NULL) &&
 168             ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
 169             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
 170             (!SCTP_IS_LISTENING(inp)))) {
 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                             (!SCTP_IS_LISTENING(inp))) {
1647 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1648                                 struct socket *so;
1649 #endif
1650                                 /*
1651                                  * Here is where collision would go if we
1652                                  * did a connect() and instead got a
1653                                  * init/init-ack/cookie done before the
1654                                  * init-ack came back..
1655                                  */
1656                                 stcb->sctp_ep->sctp_flags |=
1657                                     SCTP_PCB_FLAGS_CONNECTED;
1658 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1659                                 so = SCTP_INP_SO(stcb->sctp_ep);
1660                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1661                                 SCTP_TCB_UNLOCK(stcb);
1662                                 SCTP_SOCKET_LOCK(so, 1);
1663                                 SCTP_TCB_LOCK(stcb);
1664                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1665                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1666                                         SCTP_SOCKET_UNLOCK(so, 1);
1667                                         return (NULL);
1668                                 }
1669 #endif
1670                                 soisconnected(stcb->sctp_socket);
1671 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1672                                 SCTP_SOCKET_UNLOCK(so, 1);
1673 #endif
1674                         }
1675                         /* notify upper layer */
1676                         *notification = SCTP_NOTIFY_ASSOC_UP;
1677                         /*
1678                          * since we did not send a HB make sure we don't
1679                          * double things
1680                          */
1681                         old.tv_sec = cookie->time_entered.tv_sec;
1682                         old.tv_usec = cookie->time_entered.tv_usec;
1683                         net->hb_responded = 1;
1684                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
1685                             &old,
1686                             SCTP_RTT_FROM_NON_DATA);
1687
1688                         if (stcb->asoc.sctp_autoclose_ticks &&
1689                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1690                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1691                                     inp, stcb, NULL);
1692                         }
1693                         break;
1694                 default:
1695                         /*
1696                          * we're in the OPEN state (or beyond), so peer must
1697                          * have simply lost the COOKIE-ACK
1698                          */
1699                         break;
1700                 }               /* end switch */
1701                 sctp_stop_all_cookie_timers(stcb);
1702                 /*
1703                  * We ignore the return code here.. not sure if we should
1704                  * somehow abort.. but we do have an existing asoc. This
1705                  * really should not fail.
1706                  */
1707                 if (sctp_load_addresses_from_init(stcb, m,
1708                     init_offset + sizeof(struct sctp_init_chunk),
1709                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
1710                         if (how_indx < sizeof(asoc->cookie_how))
1711                                 asoc->cookie_how[how_indx] = 4;
1712                         return (NULL);
1713                 }
1714                 /* respond with a COOKIE-ACK */
1715                 sctp_toss_old_cookies(stcb, asoc);
1716                 sctp_send_cookie_ack(stcb);
1717                 if (how_indx < sizeof(asoc->cookie_how))
1718                         asoc->cookie_how[how_indx] = 5;
1719                 return (stcb);
1720         }
1721
1722         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1723             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1724             cookie->tie_tag_my_vtag == 0 &&
1725             cookie->tie_tag_peer_vtag == 0) {
1726                 /*
1727                  * case C in Section 5.2.4 Table 2: XMOO silently discard
1728                  */
1729                 if (how_indx < sizeof(asoc->cookie_how))
1730                         asoc->cookie_how[how_indx] = 6;
1731                 return (NULL);
1732         }
1733         /*
1734          * If nat support, and the below and stcb is established, send back
1735          * a ABORT(colliding state) if we are established.
1736          */
1737         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) &&
1738             (asoc->peer_supports_nat) &&
1739             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1740             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1741             (asoc->peer_vtag == 0)))) {
1742                 /*
1743                  * Special case - Peer's support nat. We may have two init's
1744                  * that we gave out the same tag on since one was not
1745                  * established.. i.e. we get INIT from host-1 behind the nat
1746                  * and we respond tag-a, we get a INIT from host-2 behind
1747                  * the nat and we get tag-a again. Then we bring up host-1
1748                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1749                  * Now we have colliding state. We must send an abort here
1750                  * with colliding state indication.
1751                  */
1752                 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, "");
1753                 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
1754                     mflowtype, mflowid, inp->fibnum,
1755                     vrf_id, port);
1756                 return (NULL);
1757         }
1758         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1759             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1760             (asoc->peer_vtag == 0))) {
1761                 /*
1762                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1763                  * should be ok, re-accept peer info
1764                  */
1765                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1766                         /*
1767                          * Extension of case C. If we hit this, then the
1768                          * random number generator returned the same vtag
1769                          * when we first sent our INIT-ACK and when we later
1770                          * sent our INIT. The side with the seq numbers that
1771                          * are different will be the one that normnally
1772                          * would have hit case C. This in effect "extends"
1773                          * our vtags in this collision case to be 64 bits.
1774                          * The same collision could occur aka you get both
1775                          * vtag and seq number the same twice in a row.. but
1776                          * is much less likely. If it did happen then we
1777                          * would proceed through and bring up the assoc.. we
1778                          * may end up with the wrong stream setup however..
1779                          * which would be bad.. but there is no way to
1780                          * tell.. until we send on a stream that does not
1781                          * exist :-)
1782                          */
1783                         if (how_indx < sizeof(asoc->cookie_how))
1784                                 asoc->cookie_how[how_indx] = 7;
1785
1786                         return (NULL);
1787                 }
1788                 if (how_indx < sizeof(asoc->cookie_how))
1789                         asoc->cookie_how[how_indx] = 8;
1790                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1791                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1792                 sctp_stop_all_cookie_timers(stcb);
1793                 /*
1794                  * since we did not send a HB make sure we don't double
1795                  * things
1796                  */
1797                 net->hb_responded = 1;
1798                 if (stcb->asoc.sctp_autoclose_ticks &&
1799                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1800                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1801                             NULL);
1802                 }
1803                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1804                 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1805
1806                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1807                         /*
1808                          * Ok the peer probably discarded our data (if we
1809                          * echoed a cookie+data). So anything on the
1810                          * sent_queue should be marked for retransmit, we
1811                          * may not get something to kick us so it COULD
1812                          * still take a timeout to move these.. but it can't
1813                          * hurt to mark them.
1814                          */
1815                         struct sctp_tmit_chunk *chk;
1816
1817                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1818                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1819                                         chk->sent = SCTP_DATAGRAM_RESEND;
1820                                         sctp_flight_size_decrease(chk);
1821                                         sctp_total_flight_decrease(stcb, chk);
1822                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1823                                         spec_flag++;
1824                                 }
1825                         }
1826
1827                 }
1828                 /* process the INIT info (peer's info) */
1829                 retval = sctp_process_init(init_cp, stcb);
1830                 if (retval < 0) {
1831                         if (how_indx < sizeof(asoc->cookie_how))
1832                                 asoc->cookie_how[how_indx] = 9;
1833                         return (NULL);
1834                 }
1835                 if (sctp_load_addresses_from_init(stcb, m,
1836                     init_offset + sizeof(struct sctp_init_chunk),
1837                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
1838                         if (how_indx < sizeof(asoc->cookie_how))
1839                                 asoc->cookie_how[how_indx] = 10;
1840                         return (NULL);
1841                 }
1842                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
1843                     (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
1844                         *notification = SCTP_NOTIFY_ASSOC_UP;
1845
1846                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1847                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1848                             (!SCTP_IS_LISTENING(inp))) {
1849 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1850                                 struct socket *so;
1851 #endif
1852                                 stcb->sctp_ep->sctp_flags |=
1853                                     SCTP_PCB_FLAGS_CONNECTED;
1854 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1855                                 so = SCTP_INP_SO(stcb->sctp_ep);
1856                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1857                                 SCTP_TCB_UNLOCK(stcb);
1858                                 SCTP_SOCKET_LOCK(so, 1);
1859                                 SCTP_TCB_LOCK(stcb);
1860                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1861                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1862                                         SCTP_SOCKET_UNLOCK(so, 1);
1863                                         return (NULL);
1864                                 }
1865 #endif
1866                                 soisconnected(stcb->sctp_socket);
1867 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1868                                 SCTP_SOCKET_UNLOCK(so, 1);
1869 #endif
1870                         }
1871                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)
1872                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1873                         else
1874                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1875                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1876                 } else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
1877                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1878                 } else {
1879                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1880                 }
1881                 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1882                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1883                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1884                             stcb->sctp_ep, stcb, asoc->primary_destination);
1885                 }
1886                 sctp_stop_all_cookie_timers(stcb);
1887                 sctp_toss_old_cookies(stcb, asoc);
1888                 sctp_send_cookie_ack(stcb);
1889                 if (spec_flag) {
1890                         /*
1891                          * only if we have retrans set do we do this. What
1892                          * this call does is get only the COOKIE-ACK out and
1893                          * then when we return the normal call to
1894                          * sctp_chunk_output will get the retrans out behind
1895                          * this.
1896                          */
1897                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1898                 }
1899                 if (how_indx < sizeof(asoc->cookie_how))
1900                         asoc->cookie_how[how_indx] = 11;
1901
1902                 return (stcb);
1903         }
1904         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1905             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1906             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1907             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1908             cookie->tie_tag_peer_vtag != 0) {
1909                 struct sctpasochead *head;
1910 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1911                 struct socket *so;
1912 #endif
1913
1914                 if (asoc->peer_supports_nat) {
1915                         /*
1916                          * This is a gross gross hack. Just call the
1917                          * cookie_new code since we are allowing a duplicate
1918                          * association. I hope this works...
1919                          */
1920                         return (sctp_process_cookie_new(m, iphlen, offset, src, dst,
1921                             sh, cookie, cookie_len,
1922                             inp, netp, init_src, notification,
1923                             auth_skipped, auth_offset, auth_len,
1924                             mflowtype, mflowid,
1925                             vrf_id, port));
1926                 }
1927                 /*
1928                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1929                  */
1930                 /* temp code */
1931                 if (how_indx < sizeof(asoc->cookie_how))
1932                         asoc->cookie_how[how_indx] = 12;
1933                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net,
1934                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1935                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1936                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
1937
1938                 /* notify upper layer */
1939                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1940                 atomic_add_int(&stcb->asoc.refcnt, 1);
1941                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) &&
1942                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1943                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) {
1944                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1945                 }
1946                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
1947                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1948                 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
1949                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1950                 }
1951                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1952                         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1953                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1954                             stcb->sctp_ep, stcb, asoc->primary_destination);
1955
1956                 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
1957                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1958                         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1959                 }
1960                 asoc->pre_open_streams =
1961                     ntohs(initack_cp->init.num_outbound_streams);
1962                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1963                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1964                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1965
1966                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1967
1968                 asoc->str_reset_seq_in = asoc->init_seq_number;
1969
1970                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1971                 if (asoc->mapping_array) {
1972                         memset(asoc->mapping_array, 0,
1973                             asoc->mapping_array_size);
1974                 }
1975                 if (asoc->nr_mapping_array) {
1976                         memset(asoc->nr_mapping_array, 0,
1977                             asoc->mapping_array_size);
1978                 }
1979                 SCTP_TCB_UNLOCK(stcb);
1980 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1981                 so = SCTP_INP_SO(stcb->sctp_ep);
1982                 SCTP_SOCKET_LOCK(so, 1);
1983 #endif
1984                 SCTP_INP_INFO_WLOCK();
1985                 SCTP_INP_WLOCK(stcb->sctp_ep);
1986                 SCTP_TCB_LOCK(stcb);
1987                 atomic_add_int(&stcb->asoc.refcnt, -1);
1988                 /* send up all the data */
1989                 SCTP_TCB_SEND_LOCK(stcb);
1990
1991                 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED);
1992                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1993                         stcb->asoc.strmout[i].chunks_on_queues = 0;
1994 #if defined(SCTP_DETAILED_STR_STATS)
1995                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
1996                                 asoc->strmout[i].abandoned_sent[j] = 0;
1997                                 asoc->strmout[i].abandoned_unsent[j] = 0;
1998                         }
1999 #else
2000                         asoc->strmout[i].abandoned_sent[0] = 0;
2001                         asoc->strmout[i].abandoned_unsent[0] = 0;
2002 #endif
2003                         stcb->asoc.strmout[i].sid = i;
2004                         stcb->asoc.strmout[i].next_mid_ordered = 0;
2005                         stcb->asoc.strmout[i].next_mid_unordered = 0;
2006                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
2007                 }
2008                 /* process the INIT-ACK info (my info) */
2009                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2010                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2011
2012                 /* pull from vtag hash */
2013                 LIST_REMOVE(stcb, sctp_asocs);
2014                 /* re-insert to new vtag position */
2015                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
2016                     SCTP_BASE_INFO(hashasocmark))];
2017                 /*
2018                  * put it in the bucket in the vtag hash of assoc's for the
2019                  * system
2020                  */
2021                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
2022
2023                 SCTP_TCB_SEND_UNLOCK(stcb);
2024                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
2025                 SCTP_INP_INFO_WUNLOCK();
2026 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2027                 SCTP_SOCKET_UNLOCK(so, 1);
2028 #endif
2029                 asoc->total_flight = 0;
2030                 asoc->total_flight_count = 0;
2031                 /* process the INIT info (peer's info) */
2032                 retval = sctp_process_init(init_cp, stcb);
2033                 if (retval < 0) {
2034                         if (how_indx < sizeof(asoc->cookie_how))
2035                                 asoc->cookie_how[how_indx] = 13;
2036
2037                         return (NULL);
2038                 }
2039                 /*
2040                  * since we did not send a HB make sure we don't double
2041                  * things
2042                  */
2043                 net->hb_responded = 1;
2044
2045                 if (sctp_load_addresses_from_init(stcb, m,
2046                     init_offset + sizeof(struct sctp_init_chunk),
2047                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
2048                         if (how_indx < sizeof(asoc->cookie_how))
2049                                 asoc->cookie_how[how_indx] = 14;
2050
2051                         return (NULL);
2052                 }
2053                 /* respond with a COOKIE-ACK */
2054                 sctp_stop_all_cookie_timers(stcb);
2055                 sctp_toss_old_cookies(stcb, asoc);
2056                 sctp_send_cookie_ack(stcb);
2057                 if (how_indx < sizeof(asoc->cookie_how))
2058                         asoc->cookie_how[how_indx] = 15;
2059
2060                 return (stcb);
2061         }
2062         if (how_indx < sizeof(asoc->cookie_how))
2063                 asoc->cookie_how[how_indx] = 16;
2064         /* all other cases... */
2065         return (NULL);
2066 }
2067
2068
2069 /*
2070  * handle a state cookie for a new association m: input packet mbuf chain--
2071  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
2072  * and the cookie signature does not exist offset: offset into mbuf to the
2073  * cookie-echo chunk length: length of the cookie chunk to: where the init
2074  * was from returns a new TCB
2075  */
2076 static struct sctp_tcb *
2077 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
2078     struct sockaddr *src, struct sockaddr *dst,
2079     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
2080     struct sctp_inpcb *inp, struct sctp_nets **netp,
2081     struct sockaddr *init_src, int *notification,
2082     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2083     uint8_t mflowtype, uint32_t mflowid,
2084     uint32_t vrf_id, uint16_t port)
2085 {
2086         struct sctp_tcb *stcb;
2087         struct sctp_init_chunk *init_cp, init_buf;
2088         struct sctp_init_ack_chunk *initack_cp, initack_buf;
2089         union sctp_sockstore store;
2090         struct sctp_association *asoc;
2091         int init_offset, initack_offset, initack_limit;
2092         int retval;
2093         int error = 0;
2094         uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
2095 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2096         struct socket *so;
2097
2098         so = SCTP_INP_SO(inp);
2099 #endif
2100
2101         /*
2102          * find and validate the INIT chunk in the cookie (peer's info) the
2103          * INIT should start after the cookie-echo header struct (chunk
2104          * header, state cookie header struct)
2105          */
2106         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
2107         init_cp = (struct sctp_init_chunk *)
2108             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
2109             (uint8_t *)&init_buf);
2110         if (init_cp == NULL) {
2111                 /* could not pull a INIT chunk in cookie */
2112                 SCTPDBG(SCTP_DEBUG_INPUT1,
2113                     "process_cookie_new: could not pull INIT chunk hdr\n");
2114                 return (NULL);
2115         }
2116         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
2117                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
2118                 return (NULL);
2119         }
2120         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
2121         /*
2122          * find and validate the INIT-ACK chunk in the cookie (my info) the
2123          * INIT-ACK follows the INIT chunk
2124          */
2125         initack_cp = (struct sctp_init_ack_chunk *)
2126             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
2127             (uint8_t *)&initack_buf);
2128         if (initack_cp == NULL) {
2129                 /* could not pull INIT-ACK chunk in cookie */
2130                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2131                 return (NULL);
2132         }
2133         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2134                 return (NULL);
2135         }
2136         /*
2137          * NOTE: We can't use the INIT_ACK's chk_length to determine the
2138          * "initack_limit" value.  This is because the chk_length field
2139          * includes the length of the cookie, but the cookie is omitted when
2140          * the INIT and INIT_ACK are tacked onto the cookie...
2141          */
2142         initack_limit = offset + cookie_len;
2143
2144         /*
2145          * now that we know the INIT/INIT-ACK are in place, create a new TCB
2146          * and popluate
2147          */
2148
2149         /*
2150          * Here we do a trick, we set in NULL for the proc/thread argument.
2151          * We do this since in effect we only use the p argument when the
2152          * socket is unbound and we must do an implicit bind. Since we are
2153          * getting a cookie, we cannot be unbound.
2154          */
2155         stcb = sctp_aloc_assoc(inp, init_src, &error,
2156             ntohl(initack_cp->init.initiate_tag), vrf_id,
2157             ntohs(initack_cp->init.num_outbound_streams),
2158             port,
2159             (struct thread *)NULL
2160             );
2161         if (stcb == NULL) {
2162                 struct mbuf *op_err;
2163
2164                 /* memory problem? */
2165                 SCTPDBG(SCTP_DEBUG_INPUT1,
2166                     "process_cookie_new: no room for another TCB!\n");
2167                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2168                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2169                     src, dst, sh, op_err,
2170                     mflowtype, mflowid,
2171                     vrf_id, port);
2172                 return (NULL);
2173         }
2174         /* get the correct sctp_nets */
2175         if (netp)
2176                 *netp = sctp_findnet(stcb, init_src);
2177
2178         asoc = &stcb->asoc;
2179         /* get scope variables out of cookie */
2180         asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
2181         asoc->scope.site_scope = cookie->site_scope;
2182         asoc->scope.local_scope = cookie->local_scope;
2183         asoc->scope.loopback_scope = cookie->loopback_scope;
2184
2185         if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2186             (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2187                 struct mbuf *op_err;
2188
2189                 /*
2190                  * Houston we have a problem. The EP changed while the
2191                  * cookie was in flight. Only recourse is to abort the
2192                  * association.
2193                  */
2194                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2195                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2196                     src, dst, sh, op_err,
2197                     mflowtype, mflowid,
2198                     vrf_id, port);
2199 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2200                 atomic_add_int(&stcb->asoc.refcnt, 1);
2201                 SCTP_TCB_UNLOCK(stcb);
2202                 SCTP_SOCKET_LOCK(so, 1);
2203                 SCTP_TCB_LOCK(stcb);
2204                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2205 #endif
2206                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2207                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2208 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2209                 SCTP_SOCKET_UNLOCK(so, 1);
2210 #endif
2211                 return (NULL);
2212         }
2213         /* process the INIT-ACK info (my info) */
2214         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2215         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2216         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2217         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2218         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2219         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2220         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2221         asoc->str_reset_seq_in = asoc->init_seq_number;
2222
2223         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2224
2225         /* process the INIT info (peer's info) */
2226         if (netp)
2227                 retval = sctp_process_init(init_cp, stcb);
2228         else
2229                 retval = 0;
2230         if (retval < 0) {
2231 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2232                 atomic_add_int(&stcb->asoc.refcnt, 1);
2233                 SCTP_TCB_UNLOCK(stcb);
2234                 SCTP_SOCKET_LOCK(so, 1);
2235                 SCTP_TCB_LOCK(stcb);
2236                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2237 #endif
2238                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2239                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2240 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2241                 SCTP_SOCKET_UNLOCK(so, 1);
2242 #endif
2243                 return (NULL);
2244         }
2245         /* load all addresses */
2246         if (sctp_load_addresses_from_init(stcb, m,
2247             init_offset + sizeof(struct sctp_init_chunk), initack_offset,
2248             src, dst, init_src, port)) {
2249 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2250                 atomic_add_int(&stcb->asoc.refcnt, 1);
2251                 SCTP_TCB_UNLOCK(stcb);
2252                 SCTP_SOCKET_LOCK(so, 1);
2253                 SCTP_TCB_LOCK(stcb);
2254                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2255 #endif
2256                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2257                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2258 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2259                 SCTP_SOCKET_UNLOCK(so, 1);
2260 #endif
2261                 return (NULL);
2262         }
2263         /*
2264          * verify any preceding AUTH chunk that was skipped
2265          */
2266         /* pull the local authentication parameters from the cookie/init-ack */
2267         sctp_auth_get_cookie_params(stcb, m,
2268             initack_offset + sizeof(struct sctp_init_ack_chunk),
2269             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2270         if (auth_skipped) {
2271                 struct sctp_auth_chunk *auth;
2272
2273                 auth = (struct sctp_auth_chunk *)
2274                     sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2275                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2276                         /* auth HMAC failed, dump the assoc and packet */
2277                         SCTPDBG(SCTP_DEBUG_AUTH1,
2278                             "COOKIE-ECHO: AUTH failed\n");
2279 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2280                         atomic_add_int(&stcb->asoc.refcnt, 1);
2281                         SCTP_TCB_UNLOCK(stcb);
2282                         SCTP_SOCKET_LOCK(so, 1);
2283                         SCTP_TCB_LOCK(stcb);
2284                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2285 #endif
2286                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2287                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_21);
2288 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2289                         SCTP_SOCKET_UNLOCK(so, 1);
2290 #endif
2291                         return (NULL);
2292                 } else {
2293                         /* remaining chunks checked... good to go */
2294                         stcb->asoc.authenticated = 1;
2295                 }
2296         }
2297
2298         /*
2299          * if we're doing ASCONFs, check to see if we have any new local
2300          * addresses that need to get added to the peer (eg. addresses
2301          * changed while cookie echo in flight).  This needs to be done
2302          * after we go to the OPEN state to do the correct asconf
2303          * processing. else, make sure we have the correct addresses in our
2304          * lists
2305          */
2306
2307         /* warning, we re-use sin, sin6, sa_store here! */
2308         /* pull in local_address (our "from" address) */
2309         switch (cookie->laddr_type) {
2310 #ifdef INET
2311         case SCTP_IPV4_ADDRESS:
2312                 /* source addr is IPv4 */
2313                 memset(&store.sin, 0, sizeof(struct sockaddr_in));
2314                 store.sin.sin_family = AF_INET;
2315                 store.sin.sin_len = sizeof(struct sockaddr_in);
2316                 store.sin.sin_addr.s_addr = cookie->laddress[0];
2317                 break;
2318 #endif
2319 #ifdef INET6
2320         case SCTP_IPV6_ADDRESS:
2321                 /* source addr is IPv6 */
2322                 memset(&store.sin6, 0, sizeof(struct sockaddr_in6));
2323                 store.sin6.sin6_family = AF_INET6;
2324                 store.sin6.sin6_len = sizeof(struct sockaddr_in6);
2325                 store.sin6.sin6_scope_id = cookie->scope_id;
2326                 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr));
2327                 break;
2328 #endif
2329         default:
2330 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2331                 atomic_add_int(&stcb->asoc.refcnt, 1);
2332                 SCTP_TCB_UNLOCK(stcb);
2333                 SCTP_SOCKET_LOCK(so, 1);
2334                 SCTP_TCB_LOCK(stcb);
2335                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2336 #endif
2337                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2338                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
2339 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2340                 SCTP_SOCKET_UNLOCK(so, 1);
2341 #endif
2342                 return (NULL);
2343         }
2344
2345         /* update current state */
2346         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2347         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
2348         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2349                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2350                     stcb->sctp_ep, stcb, asoc->primary_destination);
2351         }
2352         sctp_stop_all_cookie_timers(stcb);
2353         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2354         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2355
2356         /* set up to notify upper layer */
2357         *notification = SCTP_NOTIFY_ASSOC_UP;
2358         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2359             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2360             (!SCTP_IS_LISTENING(inp))) {
2361                 /*
2362                  * This is an endpoint that called connect() how it got a
2363                  * cookie that is NEW is a bit of a mystery. It must be that
2364                  * the INIT was sent, but before it got there.. a complete
2365                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2366                  * should have went to the other code.. not here.. oh well..
2367                  * a bit of protection is worth having..
2368                  */
2369                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2370 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2371                 atomic_add_int(&stcb->asoc.refcnt, 1);
2372                 SCTP_TCB_UNLOCK(stcb);
2373                 SCTP_SOCKET_LOCK(so, 1);
2374                 SCTP_TCB_LOCK(stcb);
2375                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2376                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2377                         SCTP_SOCKET_UNLOCK(so, 1);
2378                         return (NULL);
2379                 }
2380 #endif
2381                 soisconnected(stcb->sctp_socket);
2382 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2383                 SCTP_SOCKET_UNLOCK(so, 1);
2384 #endif
2385         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2386             (SCTP_IS_LISTENING(inp))) {
2387                 /*
2388                  * We don't want to do anything with this one. Since it is
2389                  * the listening guy. The timer will get started for
2390                  * accepted connections in the caller.
2391                  */
2392                 ;
2393         }
2394         /* since we did not send a HB make sure we don't double things */
2395         if ((netp) && (*netp))
2396                 (*netp)->hb_responded = 1;
2397
2398         if (stcb->asoc.sctp_autoclose_ticks &&
2399             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2400                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2401         }
2402         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2403         if ((netp != NULL) && (*netp != NULL)) {
2404                 struct timeval old;
2405
2406                 /* calculate the RTT and set the encaps port */
2407                 old.tv_sec = cookie->time_entered.tv_sec;
2408                 old.tv_usec = cookie->time_entered.tv_usec;
2409                 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
2410                     &old, SCTP_RTT_FROM_NON_DATA);
2411         }
2412         /* respond with a COOKIE-ACK */
2413         sctp_send_cookie_ack(stcb);
2414
2415         /*
2416          * check the address lists for any ASCONFs that need to be sent
2417          * AFTER the cookie-ack is sent
2418          */
2419         sctp_check_address_list(stcb, m,
2420             initack_offset + sizeof(struct sctp_init_ack_chunk),
2421             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2422             &store.sa, cookie->local_scope, cookie->site_scope,
2423             cookie->ipv4_scope, cookie->loopback_scope);
2424
2425
2426         return (stcb);
2427 }
2428
2429 /*
2430  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2431  * we NEED to make sure we are not already using the vtag. If so we
2432  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2433         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2434                                                             SCTP_BASE_INFO(hashasocmark))];
2435         LIST_FOREACH(stcb, head, sctp_asocs) {
2436                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2437                        -- SEND ABORT - TRY AGAIN --
2438                 }
2439         }
2440 */
2441
2442 /*
2443  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2444  * existing (non-NULL) TCB
2445  */
2446 static struct mbuf *
2447 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2448     struct sockaddr *src, struct sockaddr *dst,
2449     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2450     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2451     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2452     struct sctp_tcb **locked_tcb,
2453     uint8_t mflowtype, uint32_t mflowid,
2454     uint32_t vrf_id, uint16_t port)
2455 {
2456         struct sctp_state_cookie *cookie;
2457         struct sctp_tcb *l_stcb = *stcb;
2458         struct sctp_inpcb *l_inp;
2459         struct sockaddr *to;
2460         struct sctp_pcb *ep;
2461         struct mbuf *m_sig;
2462         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2463         uint8_t *sig;
2464         uint8_t cookie_ok = 0;
2465         unsigned int sig_offset, cookie_offset;
2466         unsigned int cookie_len;
2467         struct timeval now;
2468         struct timeval time_expires;
2469         int notification = 0;
2470         struct sctp_nets *netl;
2471         int had_a_existing_tcb = 0;
2472         int send_int_conf = 0;
2473 #ifdef INET
2474         struct sockaddr_in sin;
2475 #endif
2476 #ifdef INET6
2477         struct sockaddr_in6 sin6;
2478 #endif
2479
2480         SCTPDBG(SCTP_DEBUG_INPUT2,
2481             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2482
2483         if (inp_p == NULL) {
2484                 return (NULL);
2485         }
2486         cookie = &cp->cookie;
2487         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2488         cookie_len = ntohs(cp->ch.chunk_length);
2489
2490         if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2491             sizeof(struct sctp_init_chunk) +
2492             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2493                 /* cookie too small */
2494                 return (NULL);
2495         }
2496         if ((cookie->peerport != sh->src_port) ||
2497             (cookie->myport != sh->dest_port) ||
2498             (cookie->my_vtag != sh->v_tag)) {
2499                 /*
2500                  * invalid ports or bad tag.  Note that we always leave the
2501                  * v_tag in the header in network order and when we stored
2502                  * it in the my_vtag slot we also left it in network order.
2503                  * This maintains the match even though it may be in the
2504                  * opposite byte order of the machine :->
2505                  */
2506                 return (NULL);
2507         }
2508         /*
2509          * split off the signature into its own mbuf (since it should not be
2510          * calculated in the sctp_hmac_m() call).
2511          */
2512         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2513         m_sig = m_split(m, sig_offset, M_NOWAIT);
2514         if (m_sig == NULL) {
2515                 /* out of memory or ?? */
2516                 return (NULL);
2517         }
2518 #ifdef SCTP_MBUF_LOGGING
2519         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2520                 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT);
2521         }
2522 #endif
2523
2524         /*
2525          * compute the signature/digest for the cookie
2526          */
2527         ep = &(*inp_p)->sctp_ep;
2528         l_inp = *inp_p;
2529         if (l_stcb) {
2530                 SCTP_TCB_UNLOCK(l_stcb);
2531         }
2532         SCTP_INP_RLOCK(l_inp);
2533         if (l_stcb) {
2534                 SCTP_TCB_LOCK(l_stcb);
2535         }
2536         /* which cookie is it? */
2537         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2538             (ep->current_secret_number != ep->last_secret_number)) {
2539                 /* it's the old cookie */
2540                 (void)sctp_hmac_m(SCTP_HMAC,
2541                     (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2542                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2543         } else {
2544                 /* it's the current cookie */
2545                 (void)sctp_hmac_m(SCTP_HMAC,
2546                     (uint8_t *)ep->secret_key[(int)ep->current_secret_number],
2547                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2548         }
2549         /* get the signature */
2550         SCTP_INP_RUNLOCK(l_inp);
2551         sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig);
2552         if (sig == NULL) {
2553                 /* couldn't find signature */
2554                 sctp_m_freem(m_sig);
2555                 return (NULL);
2556         }
2557         /* compare the received digest with the computed digest */
2558         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2559                 /* try the old cookie? */
2560                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2561                     (ep->current_secret_number != ep->last_secret_number)) {
2562                         /* compute digest with old */
2563                         (void)sctp_hmac_m(SCTP_HMAC,
2564                             (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2565                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2566                         /* compare */
2567                         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2568                                 cookie_ok = 1;
2569                 }
2570         } else {
2571                 cookie_ok = 1;
2572         }
2573
2574         /*
2575          * Now before we continue we must reconstruct our mbuf so that
2576          * normal processing of any other chunks will work.
2577          */
2578         {
2579                 struct mbuf *m_at;
2580
2581                 m_at = m;
2582                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2583                         m_at = SCTP_BUF_NEXT(m_at);
2584                 }
2585                 SCTP_BUF_NEXT(m_at) = m_sig;
2586         }
2587
2588         if (cookie_ok == 0) {
2589                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2590                 SCTPDBG(SCTP_DEBUG_INPUT2,
2591                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2592                     (uint32_t)offset, cookie_offset, sig_offset);
2593                 return (NULL);
2594         }
2595
2596         /*
2597          * check the cookie timestamps to be sure it's not stale
2598          */
2599         (void)SCTP_GETTIME_TIMEVAL(&now);
2600         /* Expire time is in Ticks, so we convert to seconds */
2601         time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
2602         time_expires.tv_usec = cookie->time_entered.tv_usec;
2603         if (timevalcmp(&now, &time_expires, >)) {
2604                 /* cookie is stale! */
2605                 struct mbuf *op_err;
2606                 struct sctp_error_stale_cookie *cause;
2607                 struct timeval diff;
2608                 uint32_t staleness;
2609
2610                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie),
2611                     0, M_NOWAIT, 1, MT_DATA);
2612                 if (op_err == NULL) {
2613                         /* FOOBAR */
2614                         return (NULL);
2615                 }
2616                 /* Set the len */
2617                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie);
2618                 cause = mtod(op_err, struct sctp_error_stale_cookie *);
2619                 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE);
2620                 cause->cause.length = htons((sizeof(struct sctp_paramhdr) +
2621                     (sizeof(uint32_t))));
2622                 diff = now;
2623                 timevalsub(&diff, &time_expires);
2624                 if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) {
2625                         staleness = UINT32_MAX;
2626                 } else {
2627                         staleness = diff.tv_sec * 1000000;
2628                 }
2629                 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) {
2630                         staleness += diff.tv_usec;
2631                 } else {
2632                         staleness = UINT32_MAX;
2633                 }
2634                 cause->stale_time = htonl(staleness);
2635                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
2636                     mflowtype, mflowid, l_inp->fibnum,
2637                     vrf_id, port);
2638                 return (NULL);
2639         }
2640         /*
2641          * Now we must see with the lookup address if we have an existing
2642          * asoc. This will only happen if we were in the COOKIE-WAIT state
2643          * and a INIT collided with us and somewhere the peer sent the
2644          * cookie on another address besides the single address our assoc
2645          * had for him. In this case we will have one of the tie-tags set at
2646          * least AND the address field in the cookie can be used to look it
2647          * up.
2648          */
2649         to = NULL;
2650         switch (cookie->addr_type) {
2651 #ifdef INET6
2652         case SCTP_IPV6_ADDRESS:
2653                 memset(&sin6, 0, sizeof(sin6));
2654                 sin6.sin6_family = AF_INET6;
2655                 sin6.sin6_len = sizeof(sin6);
2656                 sin6.sin6_port = sh->src_port;
2657                 sin6.sin6_scope_id = cookie->scope_id;
2658                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2659                     sizeof(sin6.sin6_addr.s6_addr));
2660                 to = (struct sockaddr *)&sin6;
2661                 break;
2662 #endif
2663 #ifdef INET
2664         case SCTP_IPV4_ADDRESS:
2665                 memset(&sin, 0, sizeof(sin));
2666                 sin.sin_family = AF_INET;
2667                 sin.sin_len = sizeof(sin);
2668                 sin.sin_port = sh->src_port;
2669                 sin.sin_addr.s_addr = cookie->address[0];
2670                 to = (struct sockaddr *)&sin;
2671                 break;
2672 #endif
2673         default:
2674                 /* This should not happen */
2675                 return (NULL);
2676         }
2677         if (*stcb == NULL) {
2678                 /* Yep, lets check */
2679                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
2680                 if (*stcb == NULL) {
2681                         /*
2682                          * We should have only got back the same inp. If we
2683                          * got back a different ep we have a problem. The
2684                          * original findep got back l_inp and now
2685                          */
2686                         if (l_inp != *inp_p) {
2687                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2688                         }
2689                 } else {
2690                         if (*locked_tcb == NULL) {
2691                                 /*
2692                                  * In this case we found the assoc only
2693                                  * after we locked the create lock. This
2694                                  * means we are in a colliding case and we
2695                                  * must make sure that we unlock the tcb if
2696                                  * its one of the cases where we throw away
2697                                  * the incoming packets.
2698                                  */
2699                                 *locked_tcb = *stcb;
2700
2701                                 /*
2702                                  * We must also increment the inp ref count
2703                                  * since the ref_count flags was set when we
2704                                  * did not find the TCB, now we found it
2705                                  * which reduces the refcount.. we must
2706                                  * raise it back out to balance it all :-)
2707                                  */
2708                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2709                                 if ((*stcb)->sctp_ep != l_inp) {
2710                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2711                                             (void *)(*stcb)->sctp_ep, (void *)l_inp);
2712                                 }
2713                         }
2714                 }
2715         }
2716
2717         cookie_len -= SCTP_SIGNATURE_SIZE;
2718         if (*stcb == NULL) {
2719                 /* this is the "normal" case... get a new TCB */
2720                 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
2721                     cookie, cookie_len, *inp_p,
2722                     netp, to, &notification,
2723                     auth_skipped, auth_offset, auth_len,
2724                     mflowtype, mflowid,
2725                     vrf_id, port);
2726         } else {
2727                 /* this is abnormal... cookie-echo on existing TCB */
2728                 had_a_existing_tcb = 1;
2729                 *stcb = sctp_process_cookie_existing(m, iphlen, offset,
2730                     src, dst, sh,
2731                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2732                     &notification, auth_skipped, auth_offset, auth_len,
2733                     mflowtype, mflowid,
2734                     vrf_id, port);
2735         }
2736
2737         if (*stcb == NULL) {
2738                 /* still no TCB... must be bad cookie-echo */
2739                 return (NULL);
2740         }
2741         if (*netp != NULL) {
2742                 (*netp)->flowtype = mflowtype;
2743                 (*netp)->flowid = mflowid;
2744         }
2745         /*
2746          * Ok, we built an association so confirm the address we sent the
2747          * INIT-ACK to.
2748          */
2749         netl = sctp_findnet(*stcb, to);
2750         /*
2751          * This code should in theory NOT run but
2752          */
2753         if (netl == NULL) {
2754                 /* TSNH! Huh, why do I need to add this address here? */
2755                 if (sctp_add_remote_addr(*stcb, to, NULL, port,
2756                     SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2757                         return (NULL);
2758                 }
2759                 netl = sctp_findnet(*stcb, to);
2760         }
2761         if (netl) {
2762                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2763                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2764                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2765                             netl);
2766                         send_int_conf = 1;
2767                 }
2768         }
2769         sctp_start_net_timers(*stcb);
2770         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2771                 if (!had_a_existing_tcb ||
2772                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2773                         /*
2774                          * If we have a NEW cookie or the connect never
2775                          * reached the connected state during collision we
2776                          * must do the TCP accept thing.
2777                          */
2778                         struct socket *so, *oso;
2779                         struct sctp_inpcb *inp;
2780
2781                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2782                                 /*
2783                                  * For a restart we will keep the same
2784                                  * socket, no need to do anything. I THINK!!
2785                                  */
2786                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2787                                 if (send_int_conf) {
2788                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2789                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2790                                 }
2791                                 return (m);
2792                         }
2793                         oso = (*inp_p)->sctp_socket;
2794                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2795                         SCTP_TCB_UNLOCK((*stcb));
2796                         CURVNET_SET(oso->so_vnet);
2797                         so = sonewconn(oso, 0
2798                             );
2799                         CURVNET_RESTORE();
2800                         SCTP_TCB_LOCK((*stcb));
2801                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2802
2803                         if (so == NULL) {
2804                                 struct mbuf *op_err;
2805 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2806                                 struct socket *pcb_so;
2807 #endif
2808                                 /* Too many sockets */
2809                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2810                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2811                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2812                                     src, dst, sh, op_err,
2813                                     mflowtype, mflowid,
2814                                     vrf_id, port);
2815 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2816                                 pcb_so = SCTP_INP_SO(*inp_p);
2817                                 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2818                                 SCTP_TCB_UNLOCK((*stcb));
2819                                 SCTP_SOCKET_LOCK(pcb_so, 1);
2820                                 SCTP_TCB_LOCK((*stcb));
2821                                 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2822 #endif
2823                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC,
2824                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
2825 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2826                                 SCTP_SOCKET_UNLOCK(pcb_so, 1);
2827 #endif
2828                                 return (NULL);
2829                         }
2830                         inp = (struct sctp_inpcb *)so->so_pcb;
2831                         SCTP_INP_INCR_REF(inp);
2832                         /*
2833                          * We add the unbound flag here so that if we get an
2834                          * soabort() before we get the move_pcb done, we
2835                          * will properly cleanup.
2836                          */
2837                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2838                             SCTP_PCB_FLAGS_CONNECTED |
2839                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2840                             SCTP_PCB_FLAGS_UNBOUND |
2841                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2842                             SCTP_PCB_FLAGS_DONT_WAKE);
2843                         inp->sctp_features = (*inp_p)->sctp_features;
2844                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2845                         inp->sctp_socket = so;
2846                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2847                         inp->max_cwnd = (*inp_p)->max_cwnd;
2848                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2849                         inp->ecn_supported = (*inp_p)->ecn_supported;
2850                         inp->prsctp_supported = (*inp_p)->prsctp_supported;
2851                         inp->auth_supported = (*inp_p)->auth_supported;
2852                         inp->asconf_supported = (*inp_p)->asconf_supported;
2853                         inp->reconfig_supported = (*inp_p)->reconfig_supported;
2854                         inp->nrsack_supported = (*inp_p)->nrsack_supported;
2855                         inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
2856                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2857                         inp->sctp_context = (*inp_p)->sctp_context;
2858                         inp->local_strreset_support = (*inp_p)->local_strreset_support;
2859                         inp->fibnum = (*inp_p)->fibnum;
2860                         inp->inp_starting_point_for_iterator = NULL;
2861                         /*
2862                          * copy in the authentication parameters from the
2863                          * original endpoint
2864                          */
2865                         if (inp->sctp_ep.local_hmacs)
2866                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2867                         inp->sctp_ep.local_hmacs =
2868                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2869                         if (inp->sctp_ep.local_auth_chunks)
2870                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2871                         inp->sctp_ep.local_auth_chunks =
2872                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2873
2874                         /*
2875                          * Now we must move it from one hash table to
2876                          * another and get the tcb in the right place.
2877                          */
2878
2879                         /*
2880                          * This is where the one-2-one socket is put into
2881                          * the accept state waiting for the accept!
2882                          */
2883                         if (*stcb) {
2884                                 SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE);
2885                         }
2886                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2887
2888                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2889                         SCTP_TCB_UNLOCK((*stcb));
2890
2891                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2892                             0);
2893                         SCTP_TCB_LOCK((*stcb));
2894                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2895
2896
2897                         /*
2898                          * now we must check to see if we were aborted while
2899                          * the move was going on and the lock/unlock
2900                          * happened.
2901                          */
2902                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2903                                 /*
2904                                  * yep it was, we leave the assoc attached
2905                                  * to the socket since the sctp_inpcb_free()
2906                                  * call will send an abort for us.
2907                                  */
2908                                 SCTP_INP_DECR_REF(inp);
2909                                 return (NULL);
2910                         }
2911                         SCTP_INP_DECR_REF(inp);
2912                         /* Switch over to the new guy */
2913                         *inp_p = inp;
2914                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2915                         if (send_int_conf) {
2916                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2917                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2918                         }
2919
2920                         /*
2921                          * Pull it from the incomplete queue and wake the
2922                          * guy
2923                          */
2924 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2925                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2926                         SCTP_TCB_UNLOCK((*stcb));
2927                         SCTP_SOCKET_LOCK(so, 1);
2928 #endif
2929                         soisconnected(so);
2930 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2931                         SCTP_TCB_LOCK((*stcb));
2932                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2933                         SCTP_SOCKET_UNLOCK(so, 1);
2934 #endif
2935                         return (m);
2936                 }
2937         }
2938         if (notification) {
2939                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2940         }
2941         if (send_int_conf) {
2942                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2943                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2944         }
2945         return (m);
2946 }
2947
2948 static void
2949 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2950     struct sctp_tcb *stcb, struct sctp_nets *net)
2951 {
2952         /* cp must not be used, others call this without a c-ack :-) */
2953         struct sctp_association *asoc;
2954
2955         SCTPDBG(SCTP_DEBUG_INPUT2,
2956             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2957         if ((stcb == NULL) || (net == NULL)) {
2958                 return;
2959         }
2960
2961         asoc = &stcb->asoc;
2962         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
2963                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
2964                     asoc->overall_error_count,
2965                     0,
2966                     SCTP_FROM_SCTP_INPUT,
2967                     __LINE__);
2968         }
2969         asoc->overall_error_count = 0;
2970         sctp_stop_all_cookie_timers(stcb);
2971         /* process according to association state */
2972         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) {
2973                 /* state change only needed when I am in right state */
2974                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2975                 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
2976                 sctp_start_net_timers(stcb);
2977                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2978                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2979                             stcb->sctp_ep, stcb, asoc->primary_destination);
2980
2981                 }
2982                 /* update RTO */
2983                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2984                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2985                 if (asoc->overall_error_count == 0) {
2986                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
2987                             &asoc->time_entered,
2988                             SCTP_RTT_FROM_NON_DATA);
2989                 }
2990                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2991                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2992                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2993                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2994 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2995                         struct socket *so;
2996
2997 #endif
2998                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2999 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3000                         so = SCTP_INP_SO(stcb->sctp_ep);
3001                         atomic_add_int(&stcb->asoc.refcnt, 1);
3002                         SCTP_TCB_UNLOCK(stcb);
3003                         SCTP_SOCKET_LOCK(so, 1);
3004                         SCTP_TCB_LOCK(stcb);
3005                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3006 #endif
3007                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
3008                                 soisconnected(stcb->sctp_socket);
3009                         }
3010 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3011                         SCTP_SOCKET_UNLOCK(so, 1);
3012 #endif
3013                 }
3014                 /*
3015                  * since we did not send a HB make sure we don't double
3016                  * things
3017                  */
3018                 net->hb_responded = 1;
3019
3020                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
3021                         /*
3022                          * We don't need to do the asconf thing, nor hb or
3023                          * autoclose if the socket is closed.
3024                          */
3025                         goto closed_socket;
3026                 }
3027
3028                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
3029                     stcb, net);
3030
3031
3032                 if (stcb->asoc.sctp_autoclose_ticks &&
3033                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
3034                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
3035                             stcb->sctp_ep, stcb, NULL);
3036                 }
3037                 /*
3038                  * send ASCONF if parameters are pending and ASCONFs are
3039                  * allowed (eg. addresses changed when init/cookie echo were
3040                  * in flight)
3041                  */
3042                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
3043                     (stcb->asoc.asconf_supported == 1) &&
3044                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
3045 #ifdef SCTP_TIMER_BASED_ASCONF
3046                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
3047                             stcb->sctp_ep, stcb,
3048                             stcb->asoc.primary_destination);
3049 #else
3050                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
3051                             SCTP_ADDR_NOT_LOCKED);
3052 #endif
3053                 }
3054         }
3055 closed_socket:
3056         /* Toss the cookie if I can */
3057         sctp_toss_old_cookies(stcb, asoc);
3058         if (!TAILQ_EMPTY(&asoc->sent_queue)) {
3059                 /* Restart the timer if we have pending data */
3060                 struct sctp_tmit_chunk *chk;
3061
3062                 chk = TAILQ_FIRST(&asoc->sent_queue);
3063                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
3064         }
3065 }
3066
3067 static void
3068 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
3069     struct sctp_tcb *stcb)
3070 {
3071         struct sctp_nets *net;
3072         struct sctp_tmit_chunk *lchk;
3073         struct sctp_ecne_chunk bkup;
3074         uint8_t override_bit;
3075         uint32_t tsn, window_data_tsn;
3076         int len;
3077         unsigned int pkt_cnt;
3078
3079         len = ntohs(cp->ch.chunk_length);
3080         if ((len != sizeof(struct sctp_ecne_chunk)) &&
3081             (len != sizeof(struct old_sctp_ecne_chunk))) {
3082                 return;
3083         }
3084         if (len == sizeof(struct old_sctp_ecne_chunk)) {
3085                 /* Its the old format */
3086                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
3087                 bkup.num_pkts_since_cwr = htonl(1);
3088                 cp = &bkup;
3089         }
3090         SCTP_STAT_INCR(sctps_recvecne);
3091         tsn = ntohl(cp->tsn);
3092         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
3093         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
3094         if (lchk == NULL) {
3095                 window_data_tsn = stcb->asoc.sending_seq - 1;
3096         } else {
3097                 window_data_tsn = lchk->rec.data.tsn;
3098         }
3099
3100         /* Find where it was sent to if possible. */
3101         net = NULL;
3102         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
3103                 if (lchk->rec.data.tsn == tsn) {
3104                         net = lchk->whoTo;
3105                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
3106                         break;
3107                 }
3108                 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) {
3109                         break;
3110                 }
3111         }
3112         if (net == NULL) {
3113                 /*
3114                  * What to do. A previous send of a CWR was possibly lost.
3115                  * See how old it is, we may have it marked on the actual
3116                  * net.
3117                  */
3118                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
3119                         if (tsn == net->last_cwr_tsn) {
3120                                 /* Found him, send it off */
3121                                 break;
3122                         }
3123                 }
3124                 if (net == NULL) {
3125                         /*
3126                          * If we reach here, we need to send a special CWR
3127                          * that says hey, we did this a long time ago and
3128                          * you lost the response.
3129                          */
3130                         net = TAILQ_FIRST(&stcb->asoc.nets);
3131                         if (net == NULL) {
3132                                 /* TSNH */
3133                                 return;
3134                         }
3135                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
3136                 } else {
3137                         override_bit = 0;
3138                 }
3139         } else {
3140                 override_bit = 0;
3141         }
3142         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
3143             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3144                 /*
3145                  * JRS - Use the congestion control given in the pluggable
3146                  * CC module
3147                  */
3148                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
3149                 /*
3150                  * We reduce once every RTT. So we will only lower cwnd at
3151                  * the next sending seq i.e. the window_data_tsn
3152                  */
3153                 net->cwr_window_tsn = window_data_tsn;
3154                 net->ecn_ce_pkt_cnt += pkt_cnt;
3155                 net->lost_cnt = pkt_cnt;
3156                 net->last_cwr_tsn = tsn;
3157         } else {
3158                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
3159                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
3160                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3161                         /*
3162                          * Another loss in the same window update how many
3163                          * marks/packets lost we have had.
3164                          */
3165                         int cnt = 1;
3166
3167                         if (pkt_cnt > net->lost_cnt) {
3168                                 /* Should be the case */
3169                                 cnt = (pkt_cnt - net->lost_cnt);
3170                                 net->ecn_ce_pkt_cnt += cnt;
3171                         }
3172                         net->lost_cnt = pkt_cnt;
3173                         net->last_cwr_tsn = tsn;
3174                         /*
3175                          * Most CC functions will ignore this call, since we
3176                          * are in-window yet of the initial CE the peer saw.
3177                          */
3178                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
3179                 }
3180         }
3181         /*
3182          * We always send a CWR this way if our previous one was lost our
3183          * peer will get an update, or if it is not time again to reduce we
3184          * still get the cwr to the peer. Note we set the override when we
3185          * could not find the TSN on the chunk or the destination network.
3186          */
3187         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
3188 }
3189
3190 static void
3191 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3192 {
3193         /*
3194          * Here we get a CWR from the peer. We must look in the outqueue and
3195          * make sure that we have a covered ECNE in the control chunk part.
3196          * If so remove it.
3197          */
3198         struct sctp_tmit_chunk *chk, *nchk;
3199         struct sctp_ecne_chunk *ecne;
3200         int override;
3201         uint32_t cwr_tsn;
3202
3203         cwr_tsn = ntohl(cp->tsn);
3204         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3205         TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) {
3206                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3207                         continue;
3208                 }
3209                 if ((override == 0) && (chk->whoTo != net)) {
3210                         /* Must be from the right src unless override is set */
3211                         continue;
3212                 }
3213                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3214                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3215                         /* this covers this ECNE, we can remove it */
3216                         stcb->asoc.ecn_echo_cnt_onq--;
3217                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3218                             sctp_next);
3219                         stcb->asoc.ctrl_queue_cnt--;
3220                         sctp_m_freem(chk->data);
3221                         chk->data = NULL;
3222                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3223                         if (override == 0) {
3224                                 break;
3225                         }
3226                 }
3227         }
3228 }
3229
3230 static void
3231 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3232     struct sctp_tcb *stcb, struct sctp_nets *net)
3233 {
3234         struct sctp_association *asoc;
3235 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3236         struct socket *so;
3237 #endif
3238
3239         SCTPDBG(SCTP_DEBUG_INPUT2,
3240             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3241         if (stcb == NULL)
3242                 return;
3243
3244         asoc = &stcb->asoc;
3245         /* process according to association state */
3246         if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3247                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3248                 SCTPDBG(SCTP_DEBUG_INPUT2,
3249                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3250                 SCTP_TCB_UNLOCK(stcb);
3251                 return;
3252         }
3253         /* notify upper layer protocol */
3254         if (stcb->sctp_socket) {
3255                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3256         }
3257 #ifdef INVARIANTS
3258         if (!TAILQ_EMPTY(&asoc->send_queue) ||
3259             !TAILQ_EMPTY(&asoc->sent_queue) ||
3260             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
3261                 panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
3262         }
3263 #endif
3264         /* stop the timer */
3265         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net,
3266             SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3267         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3268         /* free the TCB */
3269         SCTPDBG(SCTP_DEBUG_INPUT2,
3270             "sctp_handle_shutdown_complete: calls free-asoc\n");
3271 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3272         so = SCTP_INP_SO(stcb->sctp_ep);
3273         atomic_add_int(&stcb->asoc.refcnt, 1);
3274         SCTP_TCB_UNLOCK(stcb);
3275         SCTP_SOCKET_LOCK(so, 1);
3276         SCTP_TCB_LOCK(stcb);
3277         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3278 #endif
3279         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
3280             SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3281 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3282         SCTP_SOCKET_UNLOCK(so, 1);
3283 #endif
3284         return;
3285 }
3286
3287 static int
3288 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3289     struct sctp_nets *net, uint8_t flg)
3290 {
3291         switch (desc->chunk_type) {
3292         case SCTP_DATA:
3293                 /* find the tsn to resend (possibly */
3294                 {
3295                         uint32_t tsn;
3296                         struct sctp_tmit_chunk *tp1;
3297
3298                         tsn = ntohl(desc->tsn_ifany);
3299                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3300                                 if (tp1->rec.data.tsn == tsn) {
3301                                         /* found it */
3302                                         break;
3303                                 }
3304                                 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) {
3305                                         /* not found */
3306                                         tp1 = NULL;
3307                                         break;
3308                                 }
3309                         }
3310                         if (tp1 == NULL) {
3311                                 /*
3312                                  * Do it the other way , aka without paying
3313                                  * attention to queue seq order.
3314                                  */
3315                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3316                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3317                                         if (tp1->rec.data.tsn == tsn) {
3318                                                 /* found it */
3319                                                 break;
3320                                         }
3321                                 }
3322                         }
3323                         if (tp1 == NULL) {
3324                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3325                         }
3326                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3327                                 uint8_t *ddp;
3328
3329                                 if (((flg & SCTP_BADCRC) == 0) &&
3330                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3331                                         return (0);
3332                                 }
3333                                 if ((stcb->asoc.peers_rwnd == 0) &&
3334                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3335                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3336                                         return (0);
3337                                 }
3338                                 if (stcb->asoc.peers_rwnd == 0 &&
3339                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3340                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3341                                         return (0);
3342                                 }
3343                                 ddp = (uint8_t *)(mtod(tp1->data, caddr_t)+
3344                                     sizeof(struct sctp_data_chunk));
3345                                 {
3346                                         unsigned int iii;
3347
3348                                         for (iii = 0; iii < sizeof(desc->data_bytes);
3349                                             iii++) {
3350                                                 if (ddp[iii] != desc->data_bytes[iii]) {
3351                                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3352                                                         return (-1);
3353                                                 }
3354                                         }
3355                                 }
3356
3357                                 if (tp1->do_rtt) {
3358                                         /*
3359                                          * this guy had a RTO calculation
3360                                          * pending on it, cancel it
3361                                          */
3362                                         if (tp1->whoTo->rto_needed == 0) {
3363                                                 tp1->whoTo->rto_needed = 1;
3364                                         }
3365                                         tp1->do_rtt = 0;
3366                                 }
3367                                 SCTP_STAT_INCR(sctps_pdrpmark);
3368                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3369                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3370                                 /*
3371                                  * mark it as if we were doing a FR, since
3372                                  * we will be getting gap ack reports behind
3373                                  * the info from the router.
3374                                  */
3375                                 tp1->rec.data.doing_fast_retransmit = 1;
3376                                 /*
3377                                  * mark the tsn with what sequences can
3378                                  * cause a new FR.
3379                                  */
3380                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3381                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3382                                 } else {
3383                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn;
3384                                 }
3385
3386                                 /* restart the timer */
3387                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3388                                     stcb, tp1->whoTo,
3389                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3390                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3391                                     stcb, tp1->whoTo);
3392
3393                                 /* fix counts and things */
3394                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3395                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3396                                             tp1->whoTo->flight_size,
3397                                             tp1->book_size,
3398                                             (uint32_t)(uintptr_t)stcb,
3399                                             tp1->rec.data.tsn);
3400                                 }
3401                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3402                                         sctp_flight_size_decrease(tp1);
3403                                         sctp_total_flight_decrease(stcb, tp1);
3404                                 }
3405                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3406                         } {
3407                                 /* audit code */
3408                                 unsigned int audit;
3409
3410                                 audit = 0;
3411                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3412                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3413                                                 audit++;
3414                                 }
3415                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3416                                     sctp_next) {
3417                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3418                                                 audit++;
3419                                 }
3420                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3421                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3422                                             audit, stcb->asoc.sent_queue_retran_cnt);
3423 #ifndef SCTP_AUDITING_ENABLED
3424                                         stcb->asoc.sent_queue_retran_cnt = audit;
3425 #endif
3426                                 }
3427                         }
3428                 }
3429                 break;
3430         case SCTP_ASCONF:
3431                 {
3432                         struct sctp_tmit_chunk *asconf;
3433
3434                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3435                             sctp_next) {
3436                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3437                                         break;
3438                                 }
3439                         }
3440                         if (asconf) {
3441                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3442                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3443                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3444                                 asconf->snd_count--;
3445                         }
3446                 }
3447                 break;
3448         case SCTP_INITIATION:
3449                 /* resend the INIT */
3450                 stcb->asoc.dropped_special_cnt++;
3451                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3452                         /*
3453                          * If we can get it in, in a few attempts we do
3454                          * this, otherwise we let the timer fire.
3455                          */
3456                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3457                             stcb, net,
3458                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
3459                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3460                 }
3461                 break;
3462         case SCTP_SELECTIVE_ACK:
3463         case SCTP_NR_SELECTIVE_ACK:
3464                 /* resend the sack */
3465                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3466                 break;
3467         case SCTP_HEARTBEAT_REQUEST:
3468                 /* resend a demand HB */
3469                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3470                         /*
3471                          * Only retransmit if we KNOW we wont destroy the
3472                          * tcb
3473                          */
3474                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3475                 }
3476                 break;
3477         case SCTP_SHUTDOWN:
3478                 sctp_send_shutdown(stcb, net);
3479                 break;
3480         case SCTP_SHUTDOWN_ACK:
3481                 sctp_send_shutdown_ack(stcb, net);
3482                 break;
3483         case SCTP_COOKIE_ECHO:
3484                 {
3485                         struct sctp_tmit_chunk *cookie;
3486
3487                         cookie = NULL;
3488                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3489                             sctp_next) {
3490                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3491                                         break;
3492                                 }
3493                         }
3494                         if (cookie) {
3495                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3496                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3497                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3498                                 sctp_stop_all_cookie_timers(stcb);
3499                         }
3500                 }
3501                 break;
3502         case SCTP_COOKIE_ACK:
3503                 sctp_send_cookie_ack(stcb);
3504                 break;
3505         case SCTP_ASCONF_ACK:
3506                 /* resend last asconf ack */
3507                 sctp_send_asconf_ack(stcb);
3508                 break;
3509         case SCTP_IFORWARD_CUM_TSN:
3510         case SCTP_FORWARD_CUM_TSN:
3511                 send_forward_tsn(stcb, &stcb->asoc);
3512                 break;
3513                 /* can't do anything with these */
3514         case SCTP_PACKET_DROPPED:
3515         case SCTP_INITIATION_ACK:       /* this should not happen */
3516         case SCTP_HEARTBEAT_ACK:
3517         case SCTP_ABORT_ASSOCIATION:
3518         case SCTP_OPERATION_ERROR:
3519         case SCTP_SHUTDOWN_COMPLETE:
3520         case SCTP_ECN_ECHO:
3521         case SCTP_ECN_CWR:
3522         default:
3523                 break;
3524         }
3525         return (0);
3526 }
3527
3528 void
3529 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3530 {
3531         uint32_t i;
3532         uint16_t temp;
3533
3534         /*
3535          * We set things to 0xffffffff since this is the last delivered
3536          * sequence and we will be sending in 0 after the reset.
3537          */
3538
3539         if (number_entries) {
3540                 for (i = 0; i < number_entries; i++) {
3541                         temp = ntohs(list[i]);
3542                         if (temp >= stcb->asoc.streamincnt) {
3543                                 continue;
3544                         }
3545                         stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff;
3546                 }
3547         } else {
3548                 list = NULL;
3549                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3550                         stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
3551                 }
3552         }
3553         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3554 }
3555
3556 static void
3557 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3558 {
3559         uint32_t i;
3560         uint16_t temp;
3561
3562         if (number_entries > 0) {
3563                 for (i = 0; i < number_entries; i++) {
3564                         temp = ntohs(list[i]);
3565                         if (temp >= stcb->asoc.streamoutcnt) {
3566                                 /* no such stream */
3567                                 continue;
3568                         }
3569                         stcb->asoc.strmout[temp].next_mid_ordered = 0;
3570                         stcb->asoc.strmout[temp].next_mid_unordered = 0;
3571                 }
3572         } else {
3573                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3574                         stcb->asoc.strmout[i].next_mid_ordered = 0;
3575                         stcb->asoc.strmout[i].next_mid_unordered = 0;
3576                 }
3577         }
3578         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3579 }
3580
3581 static void
3582 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3583 {
3584         uint32_t i;
3585         uint16_t temp;
3586
3587         if (number_entries > 0) {
3588                 for (i = 0; i < number_entries; i++) {
3589                         temp = ntohs(list[i]);
3590                         if (temp >= stcb->asoc.streamoutcnt) {
3591                                 /* no such stream */
3592                                 continue;
3593                         }
3594                         stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN;
3595                 }
3596         } else {
3597                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3598                         stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN;
3599                 }
3600         }
3601 }
3602
3603
3604 struct sctp_stream_reset_request *
3605 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3606 {
3607         struct sctp_association *asoc;
3608         struct sctp_chunkhdr *ch;
3609         struct sctp_stream_reset_request *r;
3610         struct sctp_tmit_chunk *chk;
3611         int len, clen;
3612
3613         asoc = &stcb->asoc;
3614         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3615                 asoc->stream_reset_outstanding = 0;
3616                 return (NULL);
3617         }
3618         if (stcb->asoc.str_reset == NULL) {
3619                 asoc->stream_reset_outstanding = 0;
3620                 return (NULL);
3621         }
3622         chk = stcb->asoc.str_reset;
3623         if (chk->data == NULL) {
3624                 return (NULL);
3625         }
3626         if (bchk) {
3627                 /* he wants a copy of the chk pointer */
3628                 *bchk = chk;
3629         }
3630         clen = chk->send_size;
3631         ch = mtod(chk->data, struct sctp_chunkhdr *);
3632         r = (struct sctp_stream_reset_request *)(ch + 1);
3633         if (ntohl(r->request_seq) == seq) {
3634                 /* found it */
3635                 return (r);
3636         }
3637         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3638         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3639                 /* move to the next one, there can only be a max of two */
3640                 r = (struct sctp_stream_reset_request *)((caddr_t)r + len);
3641                 if (ntohl(r->request_seq) == seq) {
3642                         return (r);
3643                 }
3644         }
3645         /* that seq is not here */
3646         return (NULL);
3647 }
3648
3649 static void
3650 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3651 {
3652         struct sctp_association *asoc;
3653         struct sctp_tmit_chunk *chk;
3654
3655         asoc = &stcb->asoc;
3656         chk = asoc->str_reset;
3657         if (chk == NULL) {
3658                 return;
3659         }
3660         asoc->str_reset = NULL;
3661         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb,
3662             chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28);
3663         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
3664         asoc->ctrl_queue_cnt--;
3665         if (chk->data) {
3666                 sctp_m_freem(chk->data);
3667                 chk->data = NULL;
3668         }
3669         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3670 }
3671
3672
3673 static int
3674 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3675     uint32_t seq, uint32_t action,
3676     struct sctp_stream_reset_response *respin)
3677 {
3678         uint16_t type;
3679         int lparam_len;
3680         struct sctp_association *asoc = &stcb->asoc;
3681         struct sctp_tmit_chunk *chk;
3682         struct sctp_stream_reset_request *req_param;
3683         struct sctp_stream_reset_out_request *req_out_param;
3684         struct sctp_stream_reset_in_request *req_in_param;
3685         uint32_t number_entries;
3686
3687         if (asoc->stream_reset_outstanding == 0) {
3688                 /* duplicate */
3689                 return (0);
3690         }
3691         if (seq == stcb->asoc.str_reset_seq_out) {
3692                 req_param = sctp_find_stream_reset(stcb, seq, &chk);
3693                 if (req_param != NULL) {
3694                         stcb->asoc.str_reset_seq_out++;
3695                         type = ntohs(req_param->ph.param_type);
3696                         lparam_len = ntohs(req_param->ph.param_length);
3697                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3698                                 int no_clear = 0;
3699
3700                                 req_out_param = (struct sctp_stream_reset_out_request *)req_param;
3701                                 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3702                                 asoc->stream_reset_out_is_outstanding = 0;
3703                                 if (asoc->stream_reset_outstanding)
3704                                         asoc->stream_reset_outstanding--;
3705                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3706                                         /* do it */
3707                                         sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
3708                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3709                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3710                                 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) {
3711                                         /*
3712                                          * Set it up so we don't stop
3713                                          * retransmitting
3714                                          */
3715                                         asoc->stream_reset_outstanding++;
3716                                         stcb->asoc.str_reset_seq_out--;
3717                                         asoc->stream_reset_out_is_outstanding = 1;
3718                                         no_clear = 1;
3719                                 } else {
3720                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3721                                 }
3722                                 if (no_clear == 0) {
3723                                         sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams);
3724                                 }
3725                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3726                                 req_in_param = (struct sctp_stream_reset_in_request *)req_param;
3727                                 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3728                                 if (asoc->stream_reset_outstanding)
3729                                         asoc->stream_reset_outstanding--;
3730                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3731                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3732                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3733                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3734                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3735                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3736                                 }
3737                         } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3738                                 /* Ok we now may have more streams */
3739                                 int num_stream;
3740
3741                                 num_stream = stcb->asoc.strm_pending_add_size;
3742                                 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3743                                         /* TSNH */
3744                                         num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3745                                 }
3746                                 stcb->asoc.strm_pending_add_size = 0;
3747                                 if (asoc->stream_reset_outstanding)
3748                                         asoc->stream_reset_outstanding--;
3749                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3750                                         /* Put the new streams into effect */
3751                                         int i;
3752
3753                                         for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) {
3754                                                 asoc->strmout[i].state = SCTP_STREAM_OPEN;
3755                                         }
3756                                         asoc->streamoutcnt += num_stream;
3757                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3758                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3759                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3760                                             SCTP_STREAM_CHANGE_DENIED);
3761                                 } else {
3762                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3763                                             SCTP_STREAM_CHANGE_FAILED);
3764                                 }
3765                         } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3766                                 if (asoc->stream_reset_outstanding)
3767                                         asoc->stream_reset_outstanding--;
3768                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3769                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3770                                             SCTP_STREAM_CHANGE_DENIED);
3771                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3772                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3773                                             SCTP_STREAM_CHANGE_FAILED);
3774                                 }
3775                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3776                                 /**
3777                                  * a) Adopt the new in tsn.
3778                                  * b) reset the map
3779                                  * c) Adopt the new out-tsn
3780                                  */
3781                                 struct sctp_stream_reset_response_tsn *resp;
3782                                 struct sctp_forward_tsn_chunk fwdtsn;
3783                                 int abort_flag = 0;
3784
3785                                 if (respin == NULL) {
3786                                         /* huh ? */
3787                                         return (0);
3788                                 }
3789                                 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
3790                                         return (0);
3791                                 }
3792                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3793                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3794                                         asoc->stream_reset_outstanding--;
3795                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3796                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3797                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3798                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3799                                         if (abort_flag) {
3800                                                 return (1);
3801                                         }
3802                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3803                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3804                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3805                                         }
3806
3807                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3808                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3809                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3810
3811                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3812                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3813
3814                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3815                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3816
3817                                         sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3818                                         sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3819                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3820                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3821                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3822                                             SCTP_ASSOC_RESET_DENIED);
3823                                 } else {
3824                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3825                                             SCTP_ASSOC_RESET_FAILED);
3826                                 }
3827                         }
3828                         /* get rid of the request and get the request flags */
3829                         if (asoc->stream_reset_outstanding == 0) {
3830                                 sctp_clean_up_stream_reset(stcb);
3831                         }
3832                 }
3833         }
3834         if (asoc->stream_reset_outstanding == 0) {
3835                 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3836         }
3837         return (0);
3838 }
3839
3840 static void
3841 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3842     struct sctp_tmit_chunk *chk,
3843     struct sctp_stream_reset_in_request *req, int trunc)
3844 {
3845         uint32_t seq;
3846         int len, i;
3847         int number_entries;
3848         uint16_t temp;
3849
3850         /*
3851          * peer wants me to send a str-reset to him for my outgoing seq's if
3852          * seq_in is right.
3853          */
3854         struct sctp_association *asoc = &stcb->asoc;
3855
3856         seq = ntohl(req->request_seq);
3857         if (asoc->str_reset_seq_in == seq) {
3858                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3859                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3860                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3861                 } else if (trunc) {
3862                         /* Can't do it, since they exceeded our buffer size  */
3863                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3864                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3865                         len = ntohs(req->ph.param_length);
3866                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3867                         if (number_entries) {
3868                                 for (i = 0; i < number_entries; i++) {
3869                                         temp = ntohs(req->list_of_streams[i]);
3870                                         if (temp >= stcb->asoc.streamoutcnt) {
3871                                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3872                                                 goto bad_boy;
3873                                         }
3874                                         req->list_of_streams[i] = temp;
3875                                 }
3876                                 for (i = 0; i < number_entries; i++) {
3877                                         if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) {
3878                                                 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING;
3879                                         }
3880                                 }
3881                         } else {
3882                                 /* Its all */
3883                                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3884                                         if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN)
3885                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING;
3886                                 }
3887                         }
3888                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3889                 } else {
3890                         /* Can't do it, since we have sent one out */
3891                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3892                 }
3893 bad_boy:
3894                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3895                 asoc->str_reset_seq_in++;
3896         } else if (asoc->str_reset_seq_in - 1 == seq) {
3897                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3898         } else if (asoc->str_reset_seq_in - 2 == seq) {
3899                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3900         } else {
3901                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3902         }
3903         sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3904 }
3905
3906 static int
3907 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3908     struct sctp_tmit_chunk *chk,
3909     struct sctp_stream_reset_tsn_request *req)
3910 {
3911         /* reset all in and out and update the tsn */
3912         /*
3913          * A) reset my str-seq's on in and out. B) Select a receive next,
3914          * and set cum-ack to it. Also process this selected number as a
3915          * fwd-tsn as well. C) set in the response my next sending seq.
3916          */
3917         struct sctp_forward_tsn_chunk fwdtsn;
3918         struct sctp_association *asoc = &stcb->asoc;
3919         int abort_flag = 0;
3920         uint32_t seq;
3921
3922         seq = ntohl(req->request_seq);
3923         if (asoc->str_reset_seq_in == seq) {
3924                 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3925                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3926                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3927                 } else {
3928                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3929                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3930                         fwdtsn.ch.chunk_flags = 0;
3931                         fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3932                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3933                         if (abort_flag) {
3934                                 return (1);
3935                         }
3936                         asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3937                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3938                                 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3939                         }
3940                         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3941                         asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3942                         memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3943                         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3944                         memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3945                         atomic_add_int(&asoc->sending_seq, 1);
3946                         /* save off historical data for retrans */
3947                         asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3948                         asoc->last_sending_seq[0] = asoc->sending_seq;
3949                         asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3950                         asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3951                         sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3952                         sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3953                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3954                         sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3955                 }
3956                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3957                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3958                 asoc->str_reset_seq_in++;
3959         } else if (asoc->str_reset_seq_in - 1 == seq) {
3960                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3961                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3962         } else if (asoc->str_reset_seq_in - 2 == seq) {
3963                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3964                     asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3965         } else {
3966                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3967         }
3968         return (0);
3969 }
3970
3971 static void
3972 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3973     struct sctp_tmit_chunk *chk,
3974     struct sctp_stream_reset_out_request *req, int trunc)
3975 {
3976         uint32_t seq, tsn;
3977         int number_entries, len;
3978         struct sctp_association *asoc = &stcb->asoc;
3979
3980         seq = ntohl(req->request_seq);
3981
3982         /* now if its not a duplicate we process it */
3983         if (asoc->str_reset_seq_in == seq) {
3984                 len = ntohs(req->ph.param_length);
3985                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3986                 /*
3987                  * the sender is resetting, handle the list issue.. we must
3988                  * a) verify if we can do the reset, if so no problem b) If
3989                  * we can't do the reset we must copy the request. c) queue
3990                  * it, and setup the data in processor to trigger it off
3991                  * when needed and dequeue all the queued data.
3992                  */
3993                 tsn = ntohl(req->send_reset_at_tsn);
3994
3995                 /* move the reset action back one */
3996                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3997                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3998                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3999                 } else if (trunc) {
4000                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4001                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
4002                         /* we can do it now */
4003                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
4004                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4005                 } else {
4006                         /*
4007                          * we must queue it up and thus wait for the TSN's
4008                          * to arrive that are at or before tsn
4009                          */
4010                         struct sctp_stream_reset_list *liste;
4011                         int siz;
4012
4013                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
4014                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
4015                             siz, SCTP_M_STRESET);
4016                         if (liste == NULL) {
4017                                 /* gak out of memory */
4018                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4019                                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4020                                 return;
4021                         }
4022                         liste->seq = seq;
4023                         liste->tsn = tsn;
4024                         liste->number_entries = number_entries;
4025                         memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
4026                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
4027                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS;
4028                 }
4029                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4030                 asoc->str_reset_seq_in++;
4031         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4032                 /*
4033                  * one seq back, just echo back last action since my
4034                  * response was lost.
4035                  */
4036                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4037         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4038                 /*
4039                  * two seq back, just echo back last action since my
4040                  * response was lost.
4041                  */
4042                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4043         } else {
4044                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4045         }
4046 }
4047
4048 static void
4049 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
4050     struct sctp_stream_reset_add_strm *str_add)
4051 {
4052         /*
4053          * Peer is requesting to add more streams. If its within our
4054          * max-streams we will allow it.
4055          */
4056         uint32_t num_stream, i;
4057         uint32_t seq;
4058         struct sctp_association *asoc = &stcb->asoc;
4059         struct sctp_queued_to_read *ctl, *nctl;
4060
4061         /* Get the number. */
4062         seq = ntohl(str_add->request_seq);
4063         num_stream = ntohs(str_add->number_of_streams);
4064         /* Now what would be the new total? */
4065         if (asoc->str_reset_seq_in == seq) {
4066                 num_stream += stcb->asoc.streamincnt;
4067                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4068                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4069                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4070                 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
4071                     (num_stream > 0xffff)) {
4072                         /* We must reject it they ask for to many */
4073         denied:
4074                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4075                 } else {
4076                         /* Ok, we can do that :-) */
4077                         struct sctp_stream_in *oldstrm;
4078
4079                         /* save off the old */
4080                         oldstrm = stcb->asoc.strmin;
4081                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
4082                             (num_stream * sizeof(struct sctp_stream_in)),
4083                             SCTP_M_STRMI);
4084                         if (stcb->asoc.strmin == NULL) {
4085                                 stcb->asoc.strmin = oldstrm;
4086                                 goto denied;
4087                         }
4088                         /* copy off the old data */
4089                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
4090                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
4091                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
4092                                 stcb->asoc.strmin[i].sid = i;
4093                                 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered;
4094                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
4095                                 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started;
4096                                 /* now anything on those queues? */
4097                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) {
4098                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm);
4099                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm);
4100                                 }
4101                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) {
4102                                         TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm);
4103                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm);
4104                                 }
4105                         }
4106                         /* Init the new streams */
4107                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
4108                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
4109                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
4110                                 stcb->asoc.strmin[i].sid = i;
4111                                 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
4112                                 stcb->asoc.strmin[i].pd_api_started = 0;
4113                                 stcb->asoc.strmin[i].delivery_started = 0;
4114                         }
4115                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
4116                         /* update the size */
4117                         stcb->asoc.streamincnt = num_stream;
4118                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4119                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
4120                 }
4121                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4122                 asoc->str_reset_seq_in++;
4123         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4124                 /*
4125                  * one seq back, just echo back last action since my
4126                  * response was lost.
4127                  */
4128                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4129         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4130                 /*
4131                  * two seq back, just echo back last action since my
4132                  * response was lost.
4133                  */
4134                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4135         } else {
4136                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4137
4138         }
4139 }
4140
4141 static void
4142 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
4143     struct sctp_stream_reset_add_strm *str_add)
4144 {
4145         /*
4146          * Peer is requesting to add more streams. If its within our
4147          * max-streams we will allow it.
4148          */
4149         uint16_t num_stream;
4150         uint32_t seq;
4151         struct sctp_association *asoc = &stcb->asoc;
4152
4153         /* Get the number. */
4154         seq = ntohl(str_add->request_seq);
4155         num_stream = ntohs(str_add->number_of_streams);
4156         /* Now what would be the new total? */
4157         if (asoc->str_reset_seq_in == seq) {
4158                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4159                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4160                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4161                 } else if (stcb->asoc.stream_reset_outstanding) {
4162                         /* We must reject it we have something pending */
4163                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
4164                 } else {
4165                         /* Ok, we can do that :-) */
4166                         int mychk;
4167
4168                         mychk = stcb->asoc.streamoutcnt;
4169                         mychk += num_stream;
4170                         if (mychk < 0x10000) {
4171                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4172                                 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) {
4173                                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4174                                 }
4175                         } else {
4176                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4177                         }
4178                 }
4179                 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
4180                 asoc->str_reset_seq_in++;
4181         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4182                 /*
4183                  * one seq back, just echo back last action since my
4184                  * response was lost.
4185                  */
4186                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4187         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4188                 /*
4189                  * two seq back, just echo back last action since my
4190                  * response was lost.
4191                  */
4192                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4193         } else {
4194                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4195         }
4196 }
4197
4198 #ifdef __GNUC__
4199 __attribute__((noinline))
4200 #endif
4201 static int
4202 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
4203     struct sctp_chunkhdr *ch_req)
4204 {
4205         uint16_t remaining_length, param_len, ptype;
4206         struct sctp_paramhdr pstore;
4207         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
4208         uint32_t seq = 0;
4209         int num_req = 0;
4210         int trunc = 0;
4211         struct sctp_tmit_chunk *chk;
4212         struct sctp_chunkhdr *ch;
4213         struct sctp_paramhdr *ph;
4214         int ret_code = 0;
4215         int num_param = 0;
4216
4217         /* now it may be a reset or a reset-response */
4218         remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
4219
4220         /* setup for adding the response */
4221         sctp_alloc_a_chunk(stcb, chk);
4222         if (chk == NULL) {
4223                 return (ret_code);
4224         }
4225         chk->copy_by_ref = 0;
4226         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
4227         chk->rec.chunk_id.can_take_data = 0;
4228         chk->flags = 0;
4229         chk->asoc = &stcb->asoc;
4230         chk->no_fr_allowed = 0;
4231         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
4232         chk->book_size_scale = 0;
4233         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
4234         if (chk->data == NULL) {
4235 strres_nochunk:
4236                 if (chk->data) {
4237                         sctp_m_freem(chk->data);
4238                         chk->data = NULL;
4239                 }
4240                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
4241                 return (ret_code);
4242         }
4243         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
4244
4245         /* setup chunk parameters */
4246         chk->sent = SCTP_DATAGRAM_UNSENT;
4247         chk->snd_count = 0;
4248         chk->whoTo = NULL;
4249
4250         ch = mtod(chk->data, struct sctp_chunkhdr *);
4251         ch->chunk_type = SCTP_STREAM_RESET;
4252         ch->chunk_flags = 0;
4253         ch->chunk_length = htons(chk->send_size);
4254         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4255         offset += sizeof(struct sctp_chunkhdr);
4256         while (remaining_length >= sizeof(struct sctp_paramhdr)) {
4257                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore);
4258                 if (ph == NULL) {
4259                         /* TSNH */
4260                         break;
4261                 }
4262                 param_len = ntohs(ph->param_length);
4263                 if ((param_len > remaining_length) ||
4264                     (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
4265                         /* bad parameter length */
4266                         break;
4267                 }
4268                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
4269                     (uint8_t *)&cstore);
4270                 if (ph == NULL) {
4271                         /* TSNH */
4272                         break;
4273                 }
4274                 ptype = ntohs(ph->param_type);
4275                 num_param++;
4276                 if (param_len > sizeof(cstore)) {
4277                         trunc = 1;
4278                 } else {
4279                         trunc = 0;
4280                 }
4281                 if (num_param > SCTP_MAX_RESET_PARAMS) {
4282                         /* hit the max of parameters already sorry.. */
4283                         break;
4284                 }
4285                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4286                         struct sctp_stream_reset_out_request *req_out;
4287
4288                         if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
4289                                 break;
4290                         }
4291                         req_out = (struct sctp_stream_reset_out_request *)ph;
4292                         num_req++;
4293                         if (stcb->asoc.stream_reset_outstanding) {
4294                                 seq = ntohl(req_out->response_seq);
4295                                 if (seq == stcb->asoc.str_reset_seq_out) {
4296                                         /* implicit ack */
4297                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4298                                 }
4299                         }
4300                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4301                 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4302                         struct sctp_stream_reset_add_strm *str_add;
4303
4304                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4305                                 break;
4306                         }
4307                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4308                         num_req++;
4309                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4310                 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4311                         struct sctp_stream_reset_add_strm *str_add;
4312
4313                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4314                                 break;
4315                         }
4316                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4317                         num_req++;
4318                         sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4319                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4320                         struct sctp_stream_reset_in_request *req_in;
4321
4322                         num_req++;
4323                         req_in = (struct sctp_stream_reset_in_request *)ph;
4324                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4325                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4326                         struct sctp_stream_reset_tsn_request *req_tsn;
4327
4328                         num_req++;
4329                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4330                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4331                                 ret_code = 1;
4332                                 goto strres_nochunk;
4333                         }
4334                         /* no more */
4335                         break;
4336                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4337                         struct sctp_stream_reset_response *resp;
4338                         uint32_t result;
4339
4340                         if (param_len < sizeof(struct sctp_stream_reset_response)) {
4341                                 break;
4342                         }
4343                         resp = (struct sctp_stream_reset_response *)ph;
4344                         seq = ntohl(resp->response_seq);
4345                         result = ntohl(resp->result);
4346                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4347                                 ret_code = 1;
4348                                 goto strres_nochunk;
4349                         }
4350                 } else {
4351                         break;
4352                 }
4353                 offset += SCTP_SIZE32(param_len);
4354                 if (remaining_length >= SCTP_SIZE32(param_len)) {
4355                         remaining_length -= SCTP_SIZE32(param_len);
4356                 } else {
4357                         remaining_length = 0;
4358                 }
4359         }
4360         if (num_req == 0) {
4361                 /* we have no response free the stuff */
4362                 goto strres_nochunk;
4363         }
4364         /* ok we have a chunk to link in */
4365         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4366             chk,
4367             sctp_next);
4368         stcb->asoc.ctrl_queue_cnt++;
4369         return (ret_code);
4370 }
4371
4372 /*
4373  * Handle a router or endpoints report of a packet loss, there are two ways
4374  * to handle this, either we get the whole packet and must disect it
4375  * ourselves (possibly with truncation and or corruption) or it is a summary
4376  * from a middle box that did the disectting for us.
4377  */
4378 static void
4379 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4380     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4381 {
4382         uint32_t bottle_bw, on_queue;
4383         uint16_t trunc_len;
4384         unsigned int chlen;
4385         unsigned int at;
4386         struct sctp_chunk_desc desc;
4387         struct sctp_chunkhdr *ch;
4388
4389         chlen = ntohs(cp->ch.chunk_length);
4390         chlen -= sizeof(struct sctp_pktdrop_chunk);
4391         /* XXX possible chlen underflow */
4392         if (chlen == 0) {
4393                 ch = NULL;
4394                 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
4395                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4396         } else {
4397                 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
4398                 chlen -= sizeof(struct sctphdr);
4399                 /* XXX possible chlen underflow */
4400                 memset(&desc, 0, sizeof(desc));
4401         }
4402         trunc_len = (uint16_t)ntohs(cp->trunc_len);
4403         if (trunc_len > limit) {
4404                 trunc_len = limit;
4405         }
4406
4407         /* now the chunks themselves */
4408         while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
4409                 desc.chunk_type = ch->chunk_type;
4410                 /* get amount we need to move */
4411                 at = ntohs(ch->chunk_length);
4412                 if (at < sizeof(struct sctp_chunkhdr)) {
4413                         /* corrupt chunk, maybe at the end? */
4414                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4415                         break;
4416                 }
4417                 if (trunc_len == 0) {
4418                         /* we are supposed to have all of it */
4419                         if (at > chlen) {
4420                                 /* corrupt skip it */
4421                                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4422                                 break;
4423                         }
4424                 } else {
4425                         /* is there enough of it left ? */
4426                         if (desc.chunk_type == SCTP_DATA) {
4427                                 if (chlen < (sizeof(struct sctp_data_chunk) +
4428                                     sizeof(desc.data_bytes))) {
4429                                         break;
4430                                 }
4431                         } else {
4432                                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4433                                         break;
4434                                 }
4435                         }
4436                 }
4437                 if (desc.chunk_type == SCTP_DATA) {
4438                         /* can we get out the tsn? */
4439                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4440                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4441
4442                         if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
4443                                 /* yep */
4444                                 struct sctp_data_chunk *dcp;
4445                                 uint8_t *ddp;
4446                                 unsigned int iii;
4447
4448                                 dcp = (struct sctp_data_chunk *)ch;
4449                                 ddp = (uint8_t *)(dcp + 1);
4450                                 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
4451                                         desc.data_bytes[iii] = ddp[iii];
4452                                 }
4453                                 desc.tsn_ifany = dcp->dp.tsn;
4454                         } else {
4455                                 /* nope we are done. */
4456                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4457                                 break;
4458                         }
4459                 } else {
4460                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4461                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4462                 }
4463
4464                 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
4465                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4466                         break;
4467                 }
4468                 if (SCTP_SIZE32(at) > chlen) {
4469                         break;
4470                 }
4471                 chlen -= SCTP_SIZE32(at);
4472                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4473                         /* done, none left */
4474                         break;
4475                 }
4476                 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
4477         }
4478         /* Now update any rwnd --- possibly */
4479         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4480                 /* From a peer, we get a rwnd report */
4481                 uint32_t a_rwnd;
4482
4483                 SCTP_STAT_INCR(sctps_pdrpfehos);
4484
4485                 bottle_bw = ntohl(cp->bottle_bw);
4486                 on_queue = ntohl(cp->current_onq);
4487                 if (bottle_bw && on_queue) {
4488                         /* a rwnd report is in here */
4489                         if (bottle_bw > on_queue)
4490                                 a_rwnd = bottle_bw - on_queue;
4491                         else
4492                                 a_rwnd = 0;
4493
4494                         if (a_rwnd == 0)
4495                                 stcb->asoc.peers_rwnd = 0;
4496                         else {
4497                                 if (a_rwnd > stcb->asoc.total_flight) {
4498                                         stcb->asoc.peers_rwnd =
4499                                             a_rwnd - stcb->asoc.total_flight;
4500                                 } else {
4501                                         stcb->asoc.peers_rwnd = 0;
4502                                 }
4503                                 if (stcb->asoc.peers_rwnd <
4504                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4505                                         /* SWS sender side engages */
4506                                         stcb->asoc.peers_rwnd = 0;
4507                                 }
4508                         }
4509                 }
4510         } else {
4511                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4512         }
4513
4514         /* now middle boxes in sat networks get a cwnd bump */
4515         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
4516             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4517             (stcb->asoc.sat_network)) {
4518                 /*
4519                  * This is debatable but for sat networks it makes sense
4520                  * Note if a T3 timer has went off, we will prohibit any
4521                  * changes to cwnd until we exit the t3 loss recovery.
4522                  */
4523                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4524                     net, cp, &bottle_bw, &on_queue);
4525         }
4526 }
4527
4528 /*
4529  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4530  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4531  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4532  * length of the complete packet outputs: - length: modified to remaining
4533  * length after control processing - netp: modified to new sctp_nets after
4534  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4535  * bad packet,...) otherwise return the tcb for this packet
4536  */
4537 #ifdef __GNUC__
4538 __attribute__((noinline))
4539 #endif
4540 static struct sctp_tcb *
4541 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4542     struct sockaddr *src, struct sockaddr *dst,
4543     struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4544     struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4545     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
4546     uint32_t vrf_id, uint16_t port)
4547 {
4548         struct sctp_association *asoc;
4549         struct mbuf *op_err;
4550         char msg[SCTP_DIAG_INFO_LEN];
4551         uint32_t vtag_in;
4552         int num_chunks = 0;     /* number of control chunks processed */
4553         uint32_t chk_length, contiguous;
4554         int ret;
4555         int abort_no_unlock = 0;
4556         int ecne_seen = 0;
4557
4558         /*
4559          * How big should this be, and should it be alloc'd? Lets try the
4560          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4561          * until we get into jumbo grams and such..
4562          */
4563         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4564         int got_auth = 0;
4565         uint32_t auth_offset = 0, auth_len = 0;
4566         int auth_skipped = 0;
4567         int asconf_cnt = 0;
4568 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4569         struct socket *so;
4570 #endif
4571
4572         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4573             iphlen, *offset, length, (void *)stcb);
4574
4575         if (stcb) {
4576                 SCTP_TCB_LOCK_ASSERT(stcb);
4577         }
4578         /* validate chunk header length... */
4579         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4580                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4581                     ntohs(ch->chunk_length));
4582                 *offset = length;
4583                 return (stcb);
4584         }
4585         /*
4586          * validate the verification tag
4587          */
4588         vtag_in = ntohl(sh->v_tag);
4589
4590         if (ch->chunk_type == SCTP_INITIATION) {
4591                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4592                     ntohs(ch->chunk_length), vtag_in);
4593                 if (vtag_in != 0) {
4594                         /* protocol error- silently discard... */
4595                         SCTP_STAT_INCR(sctps_badvtag);
4596                         if (stcb != NULL) {
4597                                 SCTP_TCB_UNLOCK(stcb);
4598                         }
4599                         return (NULL);
4600                 }
4601         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4602                 /*
4603                  * If there is no stcb, skip the AUTH chunk and process
4604                  * later after a stcb is found (to validate the lookup was
4605                  * valid.
4606                  */
4607                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4608                     (stcb == NULL) &&
4609                     (inp->auth_supported == 1)) {
4610                         /* save this chunk for later processing */
4611                         auth_skipped = 1;
4612                         auth_offset = *offset;
4613                         auth_len = ntohs(ch->chunk_length);
4614
4615                         /* (temporarily) move past this chunk */
4616                         *offset += SCTP_SIZE32(auth_len);
4617                         if (*offset >= length) {
4618                                 /* no more data left in the mbuf chain */
4619                                 *offset = length;
4620                                 return (NULL);
4621                         }
4622                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4623                             sizeof(struct sctp_chunkhdr), chunk_buf);
4624                 }
4625                 if (ch == NULL) {
4626                         /* Help */
4627                         *offset = length;
4628                         return (stcb);
4629                 }
4630                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4631                         goto process_control_chunks;
4632                 }
4633                 /*
4634                  * first check if it's an ASCONF with an unknown src addr we
4635                  * need to look inside to find the association
4636                  */
4637                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4638                         struct sctp_chunkhdr *asconf_ch = ch;
4639                         uint32_t asconf_offset = 0, asconf_len = 0;
4640
4641                         /* inp's refcount may be reduced */
4642                         SCTP_INP_INCR_REF(inp);
4643
4644                         asconf_offset = *offset;
4645                         do {
4646                                 asconf_len = ntohs(asconf_ch->chunk_length);
4647                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4648                                         break;
4649                                 stcb = sctp_findassociation_ep_asconf(m,
4650                                     *offset,
4651                                     dst,
4652                                     sh, &inp, netp, vrf_id);
4653                                 if (stcb != NULL)
4654                                         break;
4655                                 asconf_offset += SCTP_SIZE32(asconf_len);
4656                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4657                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4658                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4659                         if (stcb == NULL) {
4660                                 /*
4661                                  * reduce inp's refcount if not reduced in
4662                                  * sctp_findassociation_ep_asconf().
4663                                  */
4664                                 SCTP_INP_DECR_REF(inp);
4665                         }
4666
4667                         /* now go back and verify any auth chunk to be sure */
4668                         if (auth_skipped && (stcb != NULL)) {
4669                                 struct sctp_auth_chunk *auth;
4670
4671                                 auth = (struct sctp_auth_chunk *)
4672                                     sctp_m_getptr(m, auth_offset,
4673                                     auth_len, chunk_buf);
4674                                 got_auth = 1;
4675                                 auth_skipped = 0;
4676                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4677                                     auth_offset)) {
4678                                         /* auth HMAC failed so dump it */
4679                                         *offset = length;
4680                                         return (stcb);
4681                                 } else {
4682                                         /* remaining chunks are HMAC checked */
4683                                         stcb->asoc.authenticated = 1;
4684                                 }
4685                         }
4686                 }
4687                 if (stcb == NULL) {
4688                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4689                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4690                             msg);
4691                         /* no association, so it's out of the blue... */
4692                         sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
4693                             mflowtype, mflowid, inp->fibnum,
4694                             vrf_id, port);
4695                         *offset = length;
4696                         return (NULL);
4697                 }
4698                 asoc = &stcb->asoc;
4699                 /* ABORT and SHUTDOWN can use either v_tag... */
4700                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4701                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4702                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4703                         /* Take the T-bit always into account. */
4704                         if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
4705                             (vtag_in == asoc->my_vtag)) ||
4706                             (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
4707                             (asoc->peer_vtag != htonl(0)) &&
4708                             (vtag_in == asoc->peer_vtag))) {
4709                                 /* this is valid */
4710                         } else {
4711                                 /* drop this packet... */
4712                                 SCTP_STAT_INCR(sctps_badvtag);
4713                                 if (stcb != NULL) {
4714                                         SCTP_TCB_UNLOCK(stcb);
4715                                 }
4716                                 return (NULL);
4717                         }
4718                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4719                         if (vtag_in != asoc->my_vtag) {
4720                                 /*
4721                                  * this could be a stale SHUTDOWN-ACK or the
4722                                  * peer never got the SHUTDOWN-COMPLETE and
4723                                  * is still hung; we have started a new asoc
4724                                  * but it won't complete until the shutdown
4725                                  * is completed
4726                                  */
4727                                 if (stcb != NULL) {
4728                                         SCTP_TCB_UNLOCK(stcb);
4729                                 }
4730                                 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4731                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4732                                     msg);
4733                                 sctp_handle_ootb(m, iphlen, *offset, src, dst,
4734                                     sh, inp, op_err,
4735                                     mflowtype, mflowid, fibnum,
4736                                     vrf_id, port);
4737                                 return (NULL);
4738                         }
4739                 } else {
4740                         /* for all other chunks, vtag must match */
4741                         if (vtag_in != asoc->my_vtag) {
4742                                 /* invalid vtag... */
4743                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4744                                     "invalid vtag: %xh, expect %xh\n",
4745                                     vtag_in, asoc->my_vtag);
4746                                 SCTP_STAT_INCR(sctps_badvtag);
4747                                 if (stcb != NULL) {
4748                                         SCTP_TCB_UNLOCK(stcb);
4749                                 }
4750                                 *offset = length;
4751                                 return (NULL);
4752                         }
4753                 }
4754         }                       /* end if !SCTP_COOKIE_ECHO */
4755         /*
4756          * process all control chunks...
4757          */
4758         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4759             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4760             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4761             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
4762                 /* implied cookie-ack.. we must have lost the ack */
4763                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4764                     *netp);
4765         }
4766
4767 process_control_chunks:
4768         while (IS_SCTP_CONTROL(ch)) {
4769                 /* validate chunk length */
4770                 chk_length = ntohs(ch->chunk_length);
4771                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4772                     ch->chunk_type, chk_length);
4773                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4774                 if (chk_length < sizeof(*ch) ||
4775                     (*offset + (int)chk_length) > length) {
4776                         *offset = length;
4777                         return (stcb);
4778                 }
4779                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4780                 /*
4781                  * INIT and INIT-ACK only gets the init ack "header" portion
4782                  * only because we don't have to process the peer's COOKIE.
4783                  * All others get a complete chunk.
4784                  */
4785                 switch (ch->chunk_type) {
4786                 case SCTP_INITIATION:
4787                         contiguous = sizeof(struct sctp_init_chunk);
4788                         break;
4789                 case SCTP_INITIATION_ACK:
4790                         contiguous = sizeof(struct sctp_init_ack_chunk);
4791                         break;
4792                 default:
4793                         contiguous = min(chk_length, sizeof(chunk_buf));
4794                         break;
4795                 }
4796                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4797                     contiguous,
4798                     chunk_buf);
4799                 if (ch == NULL) {
4800                         *offset = length;
4801                         if (stcb != NULL) {
4802                                 SCTP_TCB_UNLOCK(stcb);
4803                         }
4804                         return (NULL);
4805                 }
4806
4807                 num_chunks++;
4808                 /* Save off the last place we got a control from */
4809                 if (stcb != NULL) {
4810                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4811                                 /*
4812                                  * allow last_control to be NULL if
4813                                  * ASCONF... ASCONF processing will find the
4814                                  * right net later
4815                                  */
4816                                 if ((netp != NULL) && (*netp != NULL))
4817                                         stcb->asoc.last_control_chunk_from = *netp;
4818                         }
4819                 }
4820 #ifdef SCTP_AUDITING_ENABLED
4821                 sctp_audit_log(0xB0, ch->chunk_type);
4822 #endif
4823
4824                 /* check to see if this chunk required auth, but isn't */
4825                 if ((stcb != NULL) &&
4826                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4827                     !stcb->asoc.authenticated) {
4828                         /* "silently" ignore */
4829                         SCTP_STAT_INCR(sctps_recvauthmissing);
4830                         goto next_chunk;
4831                 }
4832                 switch (ch->chunk_type) {
4833                 case SCTP_INITIATION:
4834                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4835                         /* The INIT chunk must be the only chunk. */
4836                         if ((num_chunks > 1) ||
4837                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4838                                 /* RFC 4960 requires that no ABORT is sent */
4839                                 *offset = length;
4840                                 if (stcb != NULL) {
4841                                         SCTP_TCB_UNLOCK(stcb);
4842                                 }
4843                                 return (NULL);
4844                         }
4845                         /* Honor our resource limit. */
4846                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4847                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4848                                 sctp_abort_association(inp, stcb, m, iphlen,
4849                                     src, dst, sh, op_err,
4850                                     mflowtype, mflowid,
4851                                     vrf_id, port);
4852                                 *offset = length;
4853                                 return (NULL);
4854                         }
4855                         sctp_handle_init(m, iphlen, *offset, src, dst, sh,
4856                             (struct sctp_init_chunk *)ch, inp,
4857                             stcb, *netp, &abort_no_unlock,
4858                             mflowtype, mflowid,
4859                             vrf_id, port);
4860                         *offset = length;
4861                         if ((!abort_no_unlock) && (stcb != NULL)) {
4862                                 SCTP_TCB_UNLOCK(stcb);
4863                         }
4864                         return (NULL);
4865                         break;
4866                 case SCTP_PAD_CHUNK:
4867                         break;
4868                 case SCTP_INITIATION_ACK:
4869                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n");
4870                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4871                                 /* We are not interested anymore */
4872                                 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) {
4873                                         ;
4874                                 } else {
4875                                         *offset = length;
4876                                         if (stcb != NULL) {
4877 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4878                                                 so = SCTP_INP_SO(inp);
4879                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4880                                                 SCTP_TCB_UNLOCK(stcb);
4881                                                 SCTP_SOCKET_LOCK(so, 1);
4882                                                 SCTP_TCB_LOCK(stcb);
4883                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4884 #endif
4885                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
4886                                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
4887 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4888                                                 SCTP_SOCKET_UNLOCK(so, 1);
4889 #endif
4890                                         }
4891                                         return (NULL);
4892                                 }
4893                         }
4894                         /* The INIT-ACK chunk must be the only chunk. */
4895                         if ((num_chunks > 1) ||
4896                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4897                                 *offset = length;
4898                                 return (stcb);
4899                         }
4900                         if ((netp != NULL) && (*netp != NULL)) {
4901                                 ret = sctp_handle_init_ack(m, iphlen, *offset,
4902                                     src, dst, sh,
4903                                     (struct sctp_init_ack_chunk *)ch,
4904                                     stcb, *netp,
4905                                     &abort_no_unlock,
4906                                     mflowtype, mflowid,
4907                                     vrf_id);
4908                         } else {
4909                                 ret = -1;
4910                         }
4911                         *offset = length;
4912                         if (abort_no_unlock) {
4913                                 return (NULL);
4914                         }
4915                         /*
4916                          * Special case, I must call the output routine to
4917                          * get the cookie echoed
4918                          */
4919                         if ((stcb != NULL) && (ret == 0)) {
4920                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4921                         }
4922                         return (stcb);
4923                         break;
4924                 case SCTP_SELECTIVE_ACK:
4925                 case SCTP_NR_SELECTIVE_ACK:
4926                         {
4927                                 int abort_now = 0;
4928                                 uint32_t a_rwnd, cum_ack;
4929                                 uint16_t num_seg, num_nr_seg, num_dup;
4930                                 uint8_t flags;
4931                                 int offset_seg, offset_dup;
4932
4933                                 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n",
4934                                     ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK");
4935                                 SCTP_STAT_INCR(sctps_recvsacks);
4936                                 if (stcb == NULL) {
4937                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n",
4938                                             (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK");
4939                                         break;
4940                                 }
4941                                 if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
4942                                         if (chk_length < sizeof(struct sctp_sack_chunk)) {
4943                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4944                                                 break;
4945                                         }
4946                                 } else {
4947                                         if (stcb->asoc.nrsack_supported == 0) {
4948                                                 goto unknown_chunk;
4949                                         }
4950                                         if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
4951                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n");
4952                                                 break;
4953                                         }
4954                                 }
4955                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4956                                         /*-
4957                                          * If we have sent a shutdown-ack, we will pay no
4958                                          * attention to a sack sent in to us since
4959                                          * we don't care anymore.
4960                                          */
4961                                         break;
4962                                 }
4963                                 flags = ch->chunk_flags;
4964                                 if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
4965                                         struct sctp_sack_chunk *sack;
4966
4967                                         sack = (struct sctp_sack_chunk *)ch;
4968                                         cum_ack = ntohl(sack->sack.cum_tsn_ack);
4969                                         num_seg = ntohs(sack->sack.num_gap_ack_blks);
4970                                         num_nr_seg = 0;
4971                                         num_dup = ntohs(sack->sack.num_dup_tsns);
4972                                         a_rwnd = ntohl(sack->sack.a_rwnd);
4973                                         if (sizeof(struct sctp_sack_chunk) +
4974                                             num_seg * sizeof(struct sctp_gap_ack_block) +
4975                                             num_dup * sizeof(uint32_t) != chk_length) {
4976                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4977                                                 break;
4978                                         }
4979                                         offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4980                                         offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4981                                 } else {
4982                                         struct sctp_nr_sack_chunk *nr_sack;
4983
4984                                         nr_sack = (struct sctp_nr_sack_chunk *)ch;
4985                                         cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
4986                                         num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
4987                                         num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
4988                                         num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
4989                                         a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd);
4990                                         if (sizeof(struct sctp_nr_sack_chunk) +
4991                                             (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
4992                                             num_dup * sizeof(uint32_t) != chk_length) {
4993                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
4994                                                 break;
4995                                         }
4996                                         offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
4997                                         offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block);
4998                                 }
4999                                 SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n",
5000                                     (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK",
5001                                     cum_ack, num_seg, a_rwnd);
5002                                 stcb->asoc.seen_a_sack_this_pkt = 1;
5003                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
5004                                     (num_seg == 0) && (num_nr_seg == 0) &&
5005                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
5006                                     (stcb->asoc.saw_sack_with_frags == 0) &&
5007                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
5008                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
5009                                         /*
5010                                          * We have a SIMPLE sack having no
5011                                          * prior segments and data on sent
5012                                          * queue to be acked. Use the faster
5013                                          * path sack processing. We also
5014                                          * allow window update sacks with no
5015                                          * missing segments to go this way
5016                                          * too.
5017                                          */
5018                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
5019                                             &abort_now, ecne_seen);
5020                                 } else {
5021                                         if ((netp != NULL) && (*netp != NULL)) {
5022                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
5023                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
5024                                                     cum_ack, a_rwnd, ecne_seen);
5025                                         }
5026                                 }
5027                                 if (abort_now) {
5028                                         /* ABORT signal from sack processing */
5029                                         *offset = length;
5030                                         return (NULL);
5031                                 }
5032                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
5033                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
5034                                     (stcb->asoc.stream_queue_cnt == 0)) {
5035                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
5036                                 }
5037                                 break;
5038                         }
5039                 case SCTP_HEARTBEAT_REQUEST:
5040                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
5041                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5042                                 SCTP_STAT_INCR(sctps_recvheartbeat);
5043                                 sctp_send_heartbeat_ack(stcb, m, *offset,
5044                                     chk_length, *netp);
5045                         }
5046                         break;
5047                 case SCTP_HEARTBEAT_ACK:
5048                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n");
5049                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
5050                                 /* Its not ours */
5051                                 *offset = length;
5052                                 return (stcb);
5053                         }
5054                         SCTP_STAT_INCR(sctps_recvheartbeatack);
5055                         if ((netp != NULL) && (*netp != NULL)) {
5056                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
5057                                     stcb, *netp);
5058                         }
5059                         break;
5060                 case SCTP_ABORT_ASSOCIATION:
5061                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
5062                             (void *)stcb);
5063                         *offset = length;
5064                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5065                                 if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) {
5066                                         return (NULL);
5067                                 } else {
5068                                         return (stcb);
5069                                 }
5070                         } else {
5071                                 return (NULL);
5072                         }
5073                         break;
5074                 case SCTP_SHUTDOWN:
5075                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
5076                             (void *)stcb);
5077                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
5078                                 *offset = length;
5079                                 return (stcb);
5080                         }
5081                         if ((netp != NULL) && (*netp != NULL)) {
5082                                 int abort_flag = 0;
5083
5084                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
5085                                     stcb, *netp, &abort_flag);
5086                                 if (abort_flag) {
5087                                         *offset = length;
5088                                         return (NULL);
5089                                 }
5090                         }
5091                         break;
5092                 case SCTP_SHUTDOWN_ACK:
5093                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb);
5094                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5095                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
5096                         }
5097                         *offset = length;
5098                         return (NULL);
5099                         break;
5100                 case SCTP_OPERATION_ERROR:
5101                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n");
5102                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) &&
5103                             sctp_handle_error(ch, stcb, *netp, contiguous) < 0) {
5104                                 *offset = length;
5105                                 return (NULL);
5106                         }
5107                         break;
5108                 case SCTP_COOKIE_ECHO:
5109                         SCTPDBG(SCTP_DEBUG_INPUT3,
5110                             "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb);
5111                         if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) {
5112                                 ;
5113                         } else {
5114                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5115                                         /* We are not interested anymore */
5116                         abend:
5117                                         if (stcb != NULL) {
5118                                                 SCTP_TCB_UNLOCK(stcb);
5119                                         }
5120                                         *offset = length;
5121                                         return (NULL);
5122                                 }
5123                         }
5124                         /*-
5125                          * First are we accepting? We do this again here
5126                          * since it is possible that a previous endpoint WAS
5127                          * listening responded to a INIT-ACK and then
5128                          * closed. We opened and bound.. and are now no
5129                          * longer listening.
5130                          *
5131                          * XXXGL: notes on checking listen queue length.
5132                          * 1) SCTP_IS_LISTENING() doesn't necessarily mean
5133                          *    SOLISTENING(), because a listening "UDP type"
5134                          *    socket isn't listening in terms of the socket
5135                          *    layer.  It is a normal data flow socket, that
5136                          *    can fork off new connections.  Thus, we should
5137                          *    look into sol_qlen only in case we are !UDP.
5138                          * 2) Checking sol_qlen in general requires locking
5139                          *    the socket, and this code lacks that.
5140                          */
5141                         if ((stcb == NULL) &&
5142                             (!SCTP_IS_LISTENING(inp) ||
5143                             (!(inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) &&
5144                             inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) {
5145                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
5146                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
5147                                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
5148                                         sctp_abort_association(inp, stcb, m, iphlen,
5149                                             src, dst, sh, op_err,
5150                                             mflowtype, mflowid,
5151                                             vrf_id, port);
5152                                 }
5153                                 *offset = length;
5154                                 return (NULL);
5155                         } else {
5156                                 struct mbuf *ret_buf;
5157                                 struct sctp_inpcb *linp;
5158
5159                                 if (stcb) {
5160                                         linp = NULL;
5161                                 } else {
5162                                         linp = inp;
5163                                 }
5164
5165                                 if (linp != NULL) {
5166                                         SCTP_ASOC_CREATE_LOCK(linp);
5167                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
5168                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
5169                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
5170                                                 goto abend;
5171                                         }
5172                                 }
5173
5174                                 if (netp != NULL) {
5175                                         struct sctp_tcb *locked_stcb;
5176
5177                                         locked_stcb = stcb;
5178                                         ret_buf =
5179                                             sctp_handle_cookie_echo(m, iphlen,
5180                                             *offset,
5181                                             src, dst,
5182                                             sh,
5183                                             (struct sctp_cookie_echo_chunk *)ch,
5184                                             &inp, &stcb, netp,
5185                                             auth_skipped,
5186                                             auth_offset,
5187                                             auth_len,
5188                                             &locked_stcb,
5189                                             mflowtype,
5190                                             mflowid,
5191                                             vrf_id,
5192                                             port);
5193                                         if ((locked_stcb != NULL) && (locked_stcb != stcb)) {
5194                                                 SCTP_TCB_UNLOCK(locked_stcb);
5195                                         }
5196                                         if (stcb != NULL) {
5197                                                 SCTP_TCB_LOCK_ASSERT(stcb);
5198                                         }
5199                                 } else {
5200                                         ret_buf = NULL;
5201                                 }
5202                                 if (linp != NULL) {
5203                                         SCTP_ASOC_CREATE_UNLOCK(linp);
5204                                 }
5205                                 if (ret_buf == NULL) {
5206                                         if (stcb != NULL) {
5207                                                 SCTP_TCB_UNLOCK(stcb);
5208                                         }
5209                                         SCTPDBG(SCTP_DEBUG_INPUT3,
5210                                             "GAK, null buffer\n");
5211                                         *offset = length;
5212                                         return (NULL);
5213                                 }
5214                                 /* if AUTH skipped, see if it verified... */
5215                                 if (auth_skipped) {
5216                                         got_auth = 1;
5217                                         auth_skipped = 0;
5218                                 }
5219                                 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
5220                                         /*
5221                                          * Restart the timer if we have
5222                                          * pending data
5223                                          */
5224                                         struct sctp_tmit_chunk *chk;
5225
5226                                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
5227                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
5228                                 }
5229                         }
5230                         break;
5231                 case SCTP_COOKIE_ACK:
5232                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb);
5233                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5234                                 return (stcb);
5235                         }
5236                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5237                                 /* We are not interested anymore */
5238                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5239                                         ;
5240                                 } else if (stcb) {
5241 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5242                                         so = SCTP_INP_SO(inp);
5243                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5244                                         SCTP_TCB_UNLOCK(stcb);
5245                                         SCTP_SOCKET_LOCK(so, 1);
5246                                         SCTP_TCB_LOCK(stcb);
5247                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5248 #endif
5249                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5250                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
5251 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5252                                         SCTP_SOCKET_UNLOCK(so, 1);
5253 #endif
5254                                         *offset = length;
5255                                         return (NULL);
5256                                 }
5257                         }
5258                         if ((netp != NULL) && (*netp != NULL)) {
5259                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
5260                         }
5261                         break;
5262                 case SCTP_ECN_ECHO:
5263                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n");
5264                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5265                                 /* Its not ours */
5266                                 *offset = length;
5267                                 return (stcb);
5268                         }
5269                         if (stcb->asoc.ecn_supported == 0) {
5270                                 goto unknown_chunk;
5271                         }
5272                         sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb);
5273                         ecne_seen = 1;
5274                         break;
5275                 case SCTP_ECN_CWR:
5276                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n");
5277                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5278                                 *offset = length;
5279                                 return (stcb);
5280                         }
5281                         if (stcb->asoc.ecn_supported == 0) {
5282                                 goto unknown_chunk;
5283                         }
5284                         sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5285                         break;
5286                 case SCTP_SHUTDOWN_COMPLETE:
5287                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb);
5288                         /* must be first and only chunk */
5289                         if ((num_chunks > 1) ||
5290                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5291                                 *offset = length;
5292                                 return (stcb);
5293                         }
5294                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5295                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5296                                     stcb, *netp);
5297                         }
5298                         *offset = length;
5299                         return (NULL);
5300                         break;
5301                 case SCTP_ASCONF:
5302                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5303                         if (stcb != NULL) {
5304                                 if (stcb->asoc.asconf_supported == 0) {
5305                                         goto unknown_chunk;
5306                                 }
5307                                 sctp_handle_asconf(m, *offset, src,
5308                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5309                                 asconf_cnt++;
5310                         }
5311                         break;
5312                 case SCTP_ASCONF_ACK:
5313                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n");
5314                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5315                                 /* Its not ours */
5316                                 *offset = length;
5317                                 return (stcb);
5318                         }
5319                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5320                                 if (stcb->asoc.asconf_supported == 0) {
5321                                         goto unknown_chunk;
5322                                 }
5323                                 /* He's alive so give him credit */
5324                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5325                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5326                                             stcb->asoc.overall_error_count,
5327                                             0,
5328                                             SCTP_FROM_SCTP_INPUT,
5329                                             __LINE__);
5330                                 }
5331                                 stcb->asoc.overall_error_count = 0;
5332                                 sctp_handle_asconf_ack(m, *offset,
5333                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5334                                 if (abort_no_unlock)
5335                                         return (NULL);
5336                         }
5337                         break;
5338                 case SCTP_FORWARD_CUM_TSN:
5339                 case SCTP_IFORWARD_CUM_TSN:
5340                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD_TSN\n");
5341                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5342                                 /* Its not ours */
5343                                 *offset = length;
5344                                 return (stcb);
5345                         }
5346
5347                         if (stcb != NULL) {
5348                                 int abort_flag = 0;
5349
5350                                 if (stcb->asoc.prsctp_supported == 0) {
5351                                         goto unknown_chunk;
5352                                 }
5353                                 *fwd_tsn_seen = 1;
5354                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5355                                         /* We are not interested anymore */
5356 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5357                                         so = SCTP_INP_SO(inp);
5358                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5359                                         SCTP_TCB_UNLOCK(stcb);
5360                                         SCTP_SOCKET_LOCK(so, 1);
5361                                         SCTP_TCB_LOCK(stcb);
5362                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5363 #endif
5364                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5365                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_31);
5366 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5367                                         SCTP_SOCKET_UNLOCK(so, 1);
5368 #endif
5369                                         *offset = length;
5370                                         return (NULL);
5371                                 }
5372                                 /*
5373                                  * For sending a SACK this looks like DATA
5374                                  * chunks.
5375                                  */
5376                                 stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from;
5377                                 sctp_handle_forward_tsn(stcb,
5378                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5379                                 if (abort_flag) {
5380                                         *offset = length;
5381                                         return (NULL);
5382                                 }
5383                         }
5384                         break;
5385                 case SCTP_STREAM_RESET:
5386                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5387                         if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
5388                                 /* Its not ours */
5389                                 *offset = length;
5390                                 return (stcb);
5391                         }
5392                         if (stcb->asoc.reconfig_supported == 0) {
5393                                 goto unknown_chunk;
5394                         }
5395                         if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5396                                 /* stop processing */
5397                                 *offset = length;
5398                                 return (NULL);
5399                         }
5400                         break;
5401                 case SCTP_PACKET_DROPPED:
5402                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5403                         /* re-get it all please */
5404                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5405                                 /* Its not ours */
5406                                 *offset = length;
5407                                 return (stcb);
5408                         }
5409
5410                         if ((ch != NULL) && (stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5411                                 if (stcb->asoc.pktdrop_supported == 0) {
5412                                         goto unknown_chunk;
5413                                 }
5414                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5415                                     stcb, *netp,
5416                                     min(chk_length, contiguous));
5417                         }
5418                         break;
5419                 case SCTP_AUTHENTICATION:
5420                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5421                         if (stcb == NULL) {
5422                                 /* save the first AUTH for later processing */
5423                                 if (auth_skipped == 0) {
5424                                         auth_offset = *offset;
5425                                         auth_len = chk_length;
5426                                         auth_skipped = 1;
5427                                 }
5428                                 /* skip this chunk (temporarily) */
5429                                 goto next_chunk;
5430                         }
5431                         if (stcb->asoc.auth_supported == 0) {
5432                                 goto unknown_chunk;
5433                         }
5434                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5435                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5436                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5437                                 /* Its not ours */
5438                                 *offset = length;
5439                                 return (stcb);
5440                         }
5441                         if (got_auth == 1) {
5442                                 /* skip this chunk... it's already auth'd */
5443                                 goto next_chunk;
5444                         }
5445                         got_auth = 1;
5446                         if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
5447                             m, *offset)) {
5448                                 /* auth HMAC failed so dump the packet */
5449                                 *offset = length;
5450                                 return (stcb);
5451                         } else {
5452                                 /* remaining chunks are HMAC checked */
5453                                 stcb->asoc.authenticated = 1;
5454                         }
5455                         break;
5456
5457                 default:
5458         unknown_chunk:
5459                         /* it's an unknown chunk! */
5460                         if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
5461                                 struct sctp_gen_error_cause *cause;
5462                                 int len;
5463
5464                                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause),
5465                                     0, M_NOWAIT, 1, MT_DATA);
5466                                 if (op_err != NULL) {
5467                                         len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset));
5468                                         cause = mtod(op_err, struct sctp_gen_error_cause *);
5469                                         cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5470                                         cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause)));
5471                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5472                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
5473                                         if (SCTP_BUF_NEXT(op_err) != NULL) {
5474 #ifdef SCTP_MBUF_LOGGING
5475                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5476                                                         sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY);
5477                                                 }
5478 #endif
5479                                                 sctp_queue_op_err(stcb, op_err);
5480                                         } else {
5481                                                 sctp_m_freem(op_err);
5482                                         }
5483                                 }
5484                         }
5485                         if ((ch->chunk_type & 0x80) == 0) {
5486                                 /* discard this packet */
5487                                 *offset = length;
5488                                 return (stcb);
5489                         }       /* else skip this bad chunk and continue... */
5490                         break;
5491                 }               /* switch (ch->chunk_type) */
5492
5493
5494 next_chunk:
5495                 /* get the next chunk */
5496                 *offset += SCTP_SIZE32(chk_length);
5497                 if (*offset >= length) {
5498                         /* no more data left in the mbuf chain */
5499                         break;
5500                 }
5501                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5502                     sizeof(struct sctp_chunkhdr), chunk_buf);
5503                 if (ch == NULL) {
5504                         *offset = length;
5505                         return (stcb);
5506                 }
5507         }                       /* while */
5508
5509         if ((asconf_cnt > 0) && (stcb != NULL)) {
5510                 sctp_send_asconf_ack(stcb);
5511         }
5512         return (stcb);
5513 }
5514
5515
5516 /*
5517  * common input chunk processing (v4 and v6)
5518  */
5519 void
5520 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5521     struct sockaddr *src, struct sockaddr *dst,
5522     struct sctphdr *sh, struct sctp_chunkhdr *ch,
5523     uint8_t compute_crc,
5524     uint8_t ecn_bits,
5525     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
5526     uint32_t vrf_id, uint16_t port)
5527 {
5528         uint32_t high_tsn;
5529         int fwd_tsn_seen = 0, data_processed = 0;
5530         struct mbuf *m = *mm, *op_err;
5531         char msg[SCTP_DIAG_INFO_LEN];
5532         int un_sent;
5533         int cnt_ctrl_ready = 0;
5534         struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5535         struct sctp_tcb *stcb = NULL;
5536         struct sctp_nets *net = NULL;
5537
5538         SCTP_STAT_INCR(sctps_recvdatagrams);
5539 #ifdef SCTP_AUDITING_ENABLED
5540         sctp_audit_log(0xE0, 1);
5541         sctp_auditing(0, inp, stcb, net);
5542 #endif
5543         if (compute_crc != 0) {
5544                 uint32_t check, calc_check;
5545
5546                 check = sh->checksum;
5547                 sh->checksum = 0;
5548                 calc_check = sctp_calculate_cksum(m, iphlen);
5549                 sh->checksum = check;
5550                 if (calc_check != check) {
5551                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5552                             calc_check, check, (void *)m, length, iphlen);
5553                         stcb = sctp_findassociation_addr(m, offset, src, dst,
5554                             sh, ch, &inp, &net, vrf_id);
5555 #if defined(INET) || defined(INET6)
5556                         if ((ch->chunk_type != SCTP_INITIATION) &&
5557                             (net != NULL) && (net->port != port)) {
5558                                 if (net->port == 0) {
5559                                         /* UDP encapsulation turned on. */
5560                                         net->mtu -= sizeof(struct udphdr);
5561                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5562                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5563                                         }
5564                                 } else if (port == 0) {
5565                                         /* UDP encapsulation turned off. */
5566                                         net->mtu += sizeof(struct udphdr);
5567                                         /* XXX Update smallest_mtu */
5568                                 }
5569                                 net->port = port;
5570                         }
5571 #endif
5572                         if (net != NULL) {
5573                                 net->flowtype = mflowtype;
5574                                 net->flowid = mflowid;
5575                         }
5576                         if ((inp != NULL) && (stcb != NULL)) {
5577                                 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5578                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5579                         } else if ((inp != NULL) && (stcb == NULL)) {
5580                                 inp_decr = inp;
5581                         }
5582                         SCTP_STAT_INCR(sctps_badsum);
5583                         SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5584                         goto out;
5585                 }
5586         }
5587         /* Destination port of 0 is illegal, based on RFC4960. */
5588         if (sh->dest_port == 0) {
5589                 SCTP_STAT_INCR(sctps_hdrops);
5590                 goto out;
5591         }
5592         stcb = sctp_findassociation_addr(m, offset, src, dst,
5593             sh, ch, &inp, &net, vrf_id);
5594 #if defined(INET) || defined(INET6)
5595         if ((ch->chunk_type != SCTP_INITIATION) &&
5596             (net != NULL) && (net->port != port)) {
5597                 if (net->port == 0) {
5598                         /* UDP encapsulation turned on. */
5599                         net->mtu -= sizeof(struct udphdr);
5600                         if (stcb->asoc.smallest_mtu > net->mtu) {
5601                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5602                         }
5603                 } else if (port == 0) {
5604                         /* UDP encapsulation turned off. */
5605                         net->mtu += sizeof(struct udphdr);
5606                         /* XXX Update smallest_mtu */
5607                 }
5608                 net->port = port;
5609         }
5610 #endif
5611         if (net != NULL) {
5612                 net->flowtype = mflowtype;
5613                 net->flowid = mflowid;
5614         }
5615         if (inp == NULL) {
5616                 SCTP_STAT_INCR(sctps_noport);
5617                 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5618                         goto out;
5619                 }
5620                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5621                         sctp_send_shutdown_complete2(src, dst, sh,
5622                             mflowtype, mflowid, fibnum,
5623                             vrf_id, port);
5624                         goto out;
5625                 }
5626                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5627                         goto out;
5628                 }
5629                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5630                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5631                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5632                             (ch->chunk_type != SCTP_INIT))) {
5633                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5634                                     "Out of the blue");
5635                                 sctp_send_abort(m, iphlen, src, dst,
5636                                     sh, 0, op_err,
5637                                     mflowtype, mflowid, fibnum,
5638                                     vrf_id, port);
5639                         }
5640                 }
5641                 goto out;
5642         } else if (stcb == NULL) {
5643                 inp_decr = inp;
5644         }
5645         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5646             (void *)m, iphlen, offset, length, (void *)stcb);
5647         if (stcb) {
5648                 /* always clear this before beginning a packet */
5649                 stcb->asoc.authenticated = 0;
5650                 stcb->asoc.seen_a_sack_this_pkt = 0;
5651                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5652                     (void *)stcb, stcb->asoc.state);
5653
5654                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5655                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5656                         /*-
5657                          * If we hit here, we had a ref count
5658                          * up when the assoc was aborted and the
5659                          * timer is clearing out the assoc, we should
5660                          * NOT respond to any packet.. its OOTB.
5661                          */
5662                         SCTP_TCB_UNLOCK(stcb);
5663                         stcb = NULL;
5664                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5665                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5666                             msg);
5667                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5668                             mflowtype, mflowid, inp->fibnum,
5669                             vrf_id, port);
5670                         goto out;
5671                 }
5672
5673         }
5674         if (IS_SCTP_CONTROL(ch)) {
5675                 /* process the control portion of the SCTP packet */
5676                 /* sa_ignore NO_NULL_CHK */
5677                 stcb = sctp_process_control(m, iphlen, &offset, length,
5678                     src, dst, sh, ch,
5679                     inp, stcb, &net, &fwd_tsn_seen,
5680                     mflowtype, mflowid, fibnum,
5681                     vrf_id, port);
5682                 if (stcb) {
5683                         /*
5684                          * This covers us if the cookie-echo was there and
5685                          * it changes our INP.
5686                          */
5687                         inp = stcb->sctp_ep;
5688 #if defined(INET) || defined(INET6)
5689                         if ((ch->chunk_type != SCTP_INITIATION) &&
5690                             (net != NULL) && (net->port != port)) {
5691                                 if (net->port == 0) {
5692                                         /* UDP encapsulation turned on. */
5693                                         net->mtu -= sizeof(struct udphdr);
5694                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5695                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5696                                         }
5697                                 } else if (port == 0) {
5698                                         /* UDP encapsulation turned off. */
5699                                         net->mtu += sizeof(struct udphdr);
5700                                         /* XXX Update smallest_mtu */
5701                                 }
5702                                 net->port = port;
5703                         }
5704 #endif
5705                 }
5706         } else {
5707                 /*
5708                  * no control chunks, so pre-process DATA chunks (these
5709                  * checks are taken care of by control processing)
5710                  */
5711
5712                 /*
5713                  * if DATA only packet, and auth is required, then punt...
5714                  * can't have authenticated without any AUTH (control)
5715                  * chunks
5716                  */
5717                 if ((stcb != NULL) &&
5718                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5719                         /* "silently" ignore */
5720                         SCTP_STAT_INCR(sctps_recvauthmissing);
5721                         goto out;
5722                 }
5723                 if (stcb == NULL) {
5724                         /* out of the blue DATA chunk */
5725                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5726                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5727                             msg);
5728                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5729                             mflowtype, mflowid, fibnum,
5730                             vrf_id, port);
5731                         goto out;
5732                 }
5733                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5734                         /* v_tag mismatch! */
5735                         SCTP_STAT_INCR(sctps_badvtag);
5736                         goto out;
5737                 }
5738         }
5739
5740         if (stcb == NULL) {
5741                 /*
5742                  * no valid TCB for this packet, or we found it's a bad
5743                  * packet while processing control, or we're done with this
5744                  * packet (done or skip rest of data), so we drop it...
5745                  */
5746                 goto out;
5747         }
5748
5749         /*
5750          * DATA chunk processing
5751          */
5752         /* plow through the data chunks while length > offset */
5753
5754         /*
5755          * Rest should be DATA only.  Check authentication state if AUTH for
5756          * DATA is required.
5757          */
5758         if ((length > offset) &&
5759             (stcb != NULL) &&
5760             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5761             !stcb->asoc.authenticated) {
5762                 /* "silently" ignore */
5763                 SCTP_STAT_INCR(sctps_recvauthmissing);
5764                 SCTPDBG(SCTP_DEBUG_AUTH1,
5765                     "Data chunk requires AUTH, skipped\n");
5766                 goto trigger_send;
5767         }
5768         if (length > offset) {
5769                 int retval;
5770
5771                 /*
5772                  * First check to make sure our state is correct. We would
5773                  * not get here unless we really did have a tag, so we don't
5774                  * abort if this happens, just dump the chunk silently.
5775                  */
5776                 switch (SCTP_GET_STATE(stcb)) {
5777                 case SCTP_STATE_COOKIE_ECHOED:
5778                         /*
5779                          * we consider data with valid tags in this state
5780                          * shows us the cookie-ack was lost. Imply it was
5781                          * there.
5782                          */
5783                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5784                         break;
5785                 case SCTP_STATE_COOKIE_WAIT:
5786                         /*
5787                          * We consider OOTB any data sent during asoc setup.
5788                          */
5789                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5790                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5791                             msg);
5792                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5793                             mflowtype, mflowid, inp->fibnum,
5794                             vrf_id, port);
5795                         goto out;
5796                         /* sa_ignore NOTREACHED */
5797                         break;
5798                 case SCTP_STATE_EMPTY:  /* should not happen */
5799                 case SCTP_STATE_INUSE:  /* should not happen */
5800                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5801                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5802                 default:
5803                         goto out;
5804                         /* sa_ignore NOTREACHED */
5805                         break;
5806                 case SCTP_STATE_OPEN:
5807                 case SCTP_STATE_SHUTDOWN_SENT:
5808                         break;
5809                 }
5810                 /* plow through the data chunks while length > offset */
5811                 retval = sctp_process_data(mm, iphlen, &offset, length,
5812                     inp, stcb, net, &high_tsn);
5813                 if (retval == 2) {
5814                         /*
5815                          * The association aborted, NO UNLOCK needed since
5816                          * the association is destroyed.
5817                          */
5818                         stcb = NULL;
5819                         goto out;
5820                 }
5821                 data_processed = 1;
5822                 /*
5823                  * Anything important needs to have been m_copy'ed in
5824                  * process_data
5825                  */
5826         }
5827
5828         /* take care of ecn */
5829         if ((data_processed == 1) &&
5830             (stcb->asoc.ecn_supported == 1) &&
5831             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5832                 /* Yep, we need to add a ECNE */
5833                 sctp_send_ecn_echo(stcb, net, high_tsn);
5834         }
5835
5836         if ((data_processed == 0) && (fwd_tsn_seen)) {
5837                 int was_a_gap;
5838                 uint32_t highest_tsn;
5839
5840                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
5841                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
5842                 } else {
5843                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
5844                 }
5845                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
5846                 stcb->asoc.send_sack = 1;
5847                 sctp_sack_check(stcb, was_a_gap);
5848         } else if (fwd_tsn_seen) {
5849                 stcb->asoc.send_sack = 1;
5850         }
5851         /* trigger send of any chunks in queue... */
5852 trigger_send:
5853 #ifdef SCTP_AUDITING_ENABLED
5854         sctp_audit_log(0xE0, 2);
5855         sctp_auditing(1, inp, stcb, net);
5856 #endif
5857         SCTPDBG(SCTP_DEBUG_INPUT1,
5858             "Check for chunk output prw:%d tqe:%d tf=%d\n",
5859             stcb->asoc.peers_rwnd,
5860             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
5861             stcb->asoc.total_flight);
5862         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
5863         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
5864                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
5865         }
5866         if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) ||
5867             cnt_ctrl_ready ||
5868             stcb->asoc.trigger_reset ||
5869             ((un_sent) &&
5870             (stcb->asoc.peers_rwnd > 0 ||
5871             (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
5872                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
5873                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5874                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
5875         }
5876 #ifdef SCTP_AUDITING_ENABLED
5877         sctp_audit_log(0xE0, 3);
5878         sctp_auditing(2, inp, stcb, net);
5879 #endif
5880 out:
5881         if (stcb != NULL) {
5882                 SCTP_TCB_UNLOCK(stcb);
5883         }
5884         if (inp_decr != NULL) {
5885                 /* reduce ref-count */
5886                 SCTP_INP_WLOCK(inp_decr);
5887                 SCTP_INP_DECR_REF(inp_decr);
5888                 SCTP_INP_WUNLOCK(inp_decr);
5889         }
5890         return;
5891 }
5892
5893 #ifdef INET
5894 void
5895 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
5896 {
5897         struct mbuf *m;
5898         int iphlen;
5899         uint32_t vrf_id = 0;
5900         uint8_t ecn_bits;
5901         struct sockaddr_in src, dst;
5902         struct ip *ip;
5903         struct sctphdr *sh;
5904         struct sctp_chunkhdr *ch;
5905         int length, offset;
5906         uint8_t compute_crc;
5907         uint32_t mflowid;
5908         uint8_t mflowtype;
5909         uint16_t fibnum;
5910
5911         iphlen = off;
5912         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
5913                 SCTP_RELEASE_PKT(i_pak);
5914                 return;
5915         }
5916         m = SCTP_HEADER_TO_CHAIN(i_pak);
5917 #ifdef SCTP_MBUF_LOGGING
5918         /* Log in any input mbufs */
5919         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5920                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
5921         }
5922 #endif
5923 #ifdef SCTP_PACKET_LOGGING
5924         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
5925                 sctp_packet_log(m);
5926         }
5927 #endif
5928         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
5929             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
5930             m->m_pkthdr.len,
5931             if_name(m->m_pkthdr.rcvif),
5932             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
5933         mflowid = m->m_pkthdr.flowid;
5934         mflowtype = M_HASHTYPE_GET(m);
5935         fibnum = M_GETFIB(m);
5936         SCTP_STAT_INCR(sctps_recvpackets);
5937         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
5938         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
5939         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5940         if (SCTP_BUF_LEN(m) < offset) {
5941                 if ((m = m_pullup(m, offset)) == NULL) {
5942                         SCTP_STAT_INCR(sctps_hdrops);
5943                         return;
5944                 }
5945         }
5946         ip = mtod(m, struct ip *);
5947         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
5948         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
5949         offset -= sizeof(struct sctp_chunkhdr);
5950         memset(&src, 0, sizeof(struct sockaddr_in));
5951         src.sin_family = AF_INET;
5952         src.sin_len = sizeof(struct sockaddr_in);
5953         src.sin_port = sh->src_port;
5954         src.sin_addr = ip->ip_src;
5955         memset(&dst, 0, sizeof(struct sockaddr_in));
5956         dst.sin_family = AF_INET;
5957         dst.sin_len = sizeof(struct sockaddr_in);
5958         dst.sin_port = sh->dest_port;
5959         dst.sin_addr = ip->ip_dst;
5960         length = ntohs(ip->ip_len);
5961         /* Validate mbuf chain length with IP payload length. */
5962         if (SCTP_HEADER_LEN(m) != length) {
5963                 SCTPDBG(SCTP_DEBUG_INPUT1,
5964                     "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
5965                 SCTP_STAT_INCR(sctps_hdrops);
5966                 goto out;
5967         }
5968         /* SCTP does not allow broadcasts or multicasts */
5969         if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
5970                 goto out;
5971         }
5972         if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
5973                 goto out;
5974         }
5975         ecn_bits = ip->ip_tos;
5976         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
5977                 SCTP_STAT_INCR(sctps_recvhwcrc);
5978                 compute_crc = 0;
5979         } else {
5980                 SCTP_STAT_INCR(sctps_recvswcrc);
5981                 compute_crc = 1;
5982         }
5983         sctp_common_input_processing(&m, iphlen, offset, length,
5984             (struct sockaddr *)&src,
5985             (struct sockaddr *)&dst,
5986             sh, ch,
5987             compute_crc,
5988             ecn_bits,
5989             mflowtype, mflowid, fibnum,
5990             vrf_id, port);
5991 out:
5992         if (m) {
5993                 sctp_m_freem(m);
5994         }
5995         return;
5996 }
5997
5998 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
5999 extern int *sctp_cpuarry;
6000 #endif
6001
6002 int
6003 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED)
6004 {
6005         struct mbuf *m;
6006         int off;
6007
6008         m = *mp;
6009         off = *offp;
6010 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6011         if (mp_ncpus > 1) {
6012                 struct ip *ip;
6013                 struct sctphdr *sh;
6014                 int offset;
6015                 int cpu_to_use;
6016                 uint32_t flowid, tag;
6017
6018                 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
6019                         flowid = m->m_pkthdr.flowid;
6020                 } else {
6021                         /*
6022                          * No flow id built by lower layers fix it so we
6023                          * create one.
6024                          */
6025                         offset = off + sizeof(struct sctphdr);
6026                         if (SCTP_BUF_LEN(m) < offset) {
6027                                 if ((m = m_pullup(m, offset)) == NULL) {
6028                                         SCTP_STAT_INCR(sctps_hdrops);
6029                                         return (IPPROTO_DONE);
6030                                 }
6031                         }
6032                         ip = mtod(m, struct ip *);
6033                         sh = (struct sctphdr *)((caddr_t)ip + off);
6034                         tag = htonl(sh->v_tag);
6035                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
6036                         m->m_pkthdr.flowid = flowid;
6037                         M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH);
6038                 }
6039                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
6040                 sctp_queue_to_mcore(m, off, cpu_to_use);
6041                 return (IPPROTO_DONE);
6042         }
6043 #endif
6044         sctp_input_with_port(m, off, 0);
6045         return (IPPROTO_DONE);
6046 }
6047 #endif