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