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 <netinet/in_kdtrace.h>
  56 #include <sys/smp.h>
  57
  58
  59
  60 static void
  61 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb)
  62 {
  63         struct sctp_nets *net;
  64
  65         /*
  66          * This now not only stops all cookie timers it also stops any INIT
  67          * timers as well. This will make sure that the timers are stopped
  68          * in all collision cases.
  69          */
  70         SCTP_TCB_LOCK_ASSERT(stcb);
  71         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
  72                 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) {
  73                         sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE,
  74                             stcb->sctp_ep,
  75                             stcb,
  76                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1);
  77                 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) {
  78                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT,
  79                             stcb->sctp_ep,
  80                             stcb,
  81                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2);
  82                 }
  83         }
  84 }
  85
  86 /* INIT handler */
  87 static void
  88 sctp_handle_init(struct mbuf *m, int iphlen, int offset,
  89     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
  90     struct sctp_init_chunk *cp, struct sctp_inpcb *inp,
  91     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_no_unlock,
  92     uint8_t mflowtype, uint32_t mflowid,
  93     uint32_t vrf_id, uint16_t port)
  94 {
  95         struct sctp_init *init;
  96         struct mbuf *op_err;
  97
  98         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
  99             (void *)stcb);
 100         if (stcb == NULL) {
 101                 SCTP_INP_RLOCK(inp);
 102         }
 103         /* validate length */
 104         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) {
 105                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 106                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 107                     mflowtype, mflowid,
 108                     vrf_id, port);
 109                 if (stcb)
 110                         *abort_no_unlock = 1;
 111                 goto outnow;
 112         }
 113         /* validate parameters */
 114         init = &cp->init;
 115         if (init->initiate_tag == 0) {
 116                 /* protocol error... send abort */
 117                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 118                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 119                     mflowtype, mflowid,
 120                     vrf_id, port);
 121                 if (stcb)
 122                         *abort_no_unlock = 1;
 123                 goto outnow;
 124         }
 125         if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) {
 126                 /* invalid parameter... send abort */
 127                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 128                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 129                     mflowtype, mflowid,
 130                     vrf_id, port);
 131                 if (stcb)
 132                         *abort_no_unlock = 1;
 133                 goto outnow;
 134         }
 135         if (init->num_inbound_streams == 0) {
 136                 /* protocol error... send abort */
 137                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 138                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 139                     mflowtype, mflowid,
 140                     vrf_id, port);
 141                 if (stcb)
 142                         *abort_no_unlock = 1;
 143                 goto outnow;
 144         }
 145         if (init->num_outbound_streams == 0) {
 146                 /* protocol error... send abort */
 147                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 148                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 149                     mflowtype, mflowid,
 150                     vrf_id, port);
 151                 if (stcb)
 152                         *abort_no_unlock = 1;
 153                 goto outnow;
 154         }
 155         if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
 156             offset + ntohs(cp->ch.chunk_length))) {
 157                 /* auth parameter(s) error... send abort */
 158                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 159                     "Problem with AUTH parameters");
 160                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 161                     mflowtype, mflowid,
 162                     vrf_id, port);
 163                 if (stcb)
 164                         *abort_no_unlock = 1;
 165                 goto outnow;
 166         }
 167         /* We are only accepting if we have a listening socket. */
 168         if ((stcb == NULL) &&
 169             ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
 170             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
 171             (!SCTP_IS_LISTENING(inp)))) {
 172                 /*
 173                  * FIX ME ?? What about TCP model and we have a
 174                  * match/restart case? Actually no fix is needed. the lookup
 175                  * will always find the existing assoc so stcb would not be
 176                  * NULL. It may be questionable to do this since we COULD
 177                  * just send back the INIT-ACK and hope that the app did
 178                  * accept()'s by the time the COOKIE was sent. But there is
 179                  * a price to pay for COOKIE generation and I don't want to
 180                  * pay it on the chance that the app will actually do some
 181                  * accepts(). The App just looses and should NOT be in this
 182                  * state :-)
 183                  */
 184                 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) {
 185                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 186                             "No listener");
 187                         sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
 188                             mflowtype, mflowid, inp->fibnum,
 189                             vrf_id, port);
 190                 }
 191                 goto outnow;
 192         }
 193         if ((stcb != NULL) &&
 194             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 195                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n");
 196                 sctp_send_shutdown_ack(stcb, NULL);
 197                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
 198         } else {
 199                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
 200                 sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset,
 201                     src, dst, sh, cp,
 202                     mflowtype, mflowid,
 203                     vrf_id, port);
 204         }
 205 outnow:
 206         if (stcb == NULL) {
 207                 SCTP_INP_RUNLOCK(inp);
 208         }
 209 }
 210
 211 /*
 212  * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
 213  */
 214
 215 int
 216 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked
 217 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 218     SCTP_UNUSED
 219 #endif
 220 )
 221 {
 222         int unsent_data;
 223         unsigned int i;
 224         struct sctp_stream_queue_pending *sp;
 225         struct sctp_association *asoc;
 226
 227         /*
 228          * This function returns if any stream has true unsent data on it.
 229          * Note that as it looks through it will clean up any places that
 230          * have old data that has been sent but left at top of stream queue.
 231          */
 232         asoc = &stcb->asoc;
 233         unsent_data = 0;
 234         SCTP_TCB_SEND_LOCK(stcb);
 235         if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
 236                 /* Check to see if some data queued */
 237                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 238                         /* sa_ignore FREED_MEMORY */
 239                         sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
 240                         if (sp == NULL) {
 241                                 continue;
 242                         }
 243                         if ((sp->msg_is_complete) &&
 244                             (sp->length == 0) &&
 245                             (sp->sender_all_done)) {
 246                                 /*
 247                                  * We are doing differed cleanup. Last time
 248                                  * through when we took all the data the
 249                                  * sender_all_done was not set.
 250                                  */
 251                                 if (sp->put_last_out == 0) {
 252                                         SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
 253                                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
 254                                             sp->sender_all_done,
 255                                             sp->length,
 256                                             sp->msg_is_complete,
 257                                             sp->put_last_out);
 258                                 }
 259                                 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 260                                 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
 261                                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp, 1);
 262                                 if (sp->net) {
 263                                         sctp_free_remote_addr(sp->net);
 264                                         sp->net = NULL;
 265                                 }
 266                                 if (sp->data) {
 267                                         sctp_m_freem(sp->data);
 268                                         sp->data = NULL;
 269                                 }
 270                                 sctp_free_a_strmoq(stcb, sp, so_locked);
 271                                 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
 272                                         unsent_data++;
 273                                 }
 274                         } else {
 275                                 unsent_data++;
 276                         }
 277                         if (unsent_data > 0) {
 278                                 break;
 279                         }
 280                 }
 281         }
 282         SCTP_TCB_SEND_UNLOCK(stcb);
 283         return (unsent_data);
 284 }
 285
 286 static int
 287 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb)
 288 {
 289         struct sctp_init *init;
 290         struct sctp_association *asoc;
 291         struct sctp_nets *lnet;
 292         unsigned int i;
 293
 294         init = &cp->init;
 295         asoc = &stcb->asoc;
 296         /* save off parameters */
 297         asoc->peer_vtag = ntohl(init->initiate_tag);
 298         asoc->peers_rwnd = ntohl(init->a_rwnd);
 299         /* init tsn's */
 300         asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
 301
 302         if (!TAILQ_EMPTY(&asoc->nets)) {
 303                 /* update any ssthresh's that may have a default */
 304                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
 305                         lnet->ssthresh = asoc->peers_rwnd;
 306                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
 307                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
 308                         }
 309
 310                 }
 311         }
 312         SCTP_TCB_SEND_LOCK(stcb);
 313         if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
 314                 unsigned int newcnt;
 315                 struct sctp_stream_out *outs;
 316                 struct sctp_stream_queue_pending *sp, *nsp;
 317                 struct sctp_tmit_chunk *chk, *nchk;
 318
 319                 /* abandon the upper streams */
 320                 newcnt = ntohs(init->num_inbound_streams);
 321                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
 322                         if (chk->rec.data.sid >= newcnt) {
 323                                 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
 324                                 asoc->send_queue_cnt--;
 325                                 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) {
 326                                         asoc->strmout[chk->rec.data.sid].chunks_on_queues--;
 327 #ifdef INVARIANTS
 328                                 } else {
 329                                         panic("No chunks on the queues for sid %u.", chk->rec.data.sid);
 330 #endif
 331                                 }
 332                                 if (chk->data != NULL) {
 333                                         sctp_free_bufspace(stcb, asoc, chk, 1);
 334                                         sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb,
 335                                             0, chk, SCTP_SO_NOT_LOCKED);
 336                                         if (chk->data) {
 337                                                 sctp_m_freem(chk->data);
 338                                                 chk->data = NULL;
 339                                         }
 340                                 }
 341                                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 342                                 /* sa_ignore FREED_MEMORY */
 343                         }
 344                 }
 345                 if (asoc->strmout) {
 346                         for (i = newcnt; i < asoc->pre_open_streams; i++) {
 347                                 outs = &asoc->strmout[i];
 348                                 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
 349                                         atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 350                                         TAILQ_REMOVE(&outs->outqueue, sp, next);
 351                                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp, 1);
 352                                         sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
 353                                             stcb, 0, sp, SCTP_SO_NOT_LOCKED);
 354                                         if (sp->data) {
 355                                                 sctp_m_freem(sp->data);
 356                                                 sp->data = NULL;
 357                                         }
 358                                         if (sp->net) {
 359                                                 sctp_free_remote_addr(sp->net);
 360                                                 sp->net = NULL;
 361                                         }
 362                                         /* Free the chunk */
 363                                         sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
 364                                         /* sa_ignore FREED_MEMORY */
 365                                 }
 366                                 outs->state = SCTP_STREAM_CLOSED;
 367                         }
 368                 }
 369                 /* cut back the count */
 370                 asoc->pre_open_streams = newcnt;
 371         }
 372         SCTP_TCB_SEND_UNLOCK(stcb);
 373         asoc->streamoutcnt = asoc->pre_open_streams;
 374         if (asoc->strmout) {
 375                 for (i = 0; i < asoc->streamoutcnt; i++) {
 376                         asoc->strmout[i].state = SCTP_STREAM_OPEN;
 377                 }
 378         }
 379         /* EY - nr_sack: initialize highest tsn in nr_mapping_array */
 380         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
 381         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
 382                 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 383         }
 384         /* This is the next one we expect */
 385         asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
 386
 387         asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
 388         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
 389
 390         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
 391         /* open the requested streams */
 392
 393         if (asoc->strmin != NULL) {
 394                 /* Free the old ones */
 395                 for (i = 0; i < asoc->streamincnt; i++) {
 396                         sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue);
 397                         sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue);
 398                 }
 399                 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
 400         }
 401         if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) {
 402                 asoc->streamincnt = ntohs(init->num_outbound_streams);
 403         } else {
 404                 asoc->streamincnt = asoc->max_inbound_streams;
 405         }
 406         SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
 407             sizeof(struct sctp_stream_in), SCTP_M_STRMI);
 408         if (asoc->strmin == NULL) {
 409                 /* we didn't get memory for the streams! */
 410                 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
 411                 return (-1);
 412         }
 413         for (i = 0; i < asoc->streamincnt; i++) {
 414                 asoc->strmin[i].sid = i;
 415                 asoc->strmin[i].last_mid_delivered = 0xffffffff;
 416                 TAILQ_INIT(&asoc->strmin[i].inqueue);
 417                 TAILQ_INIT(&asoc->strmin[i].uno_inqueue);
 418                 asoc->strmin[i].pd_api_started = 0;
 419                 asoc->strmin[i].delivery_started = 0;
 420         }
 421         /*
 422          * load_address_from_init will put the addresses into the
 423          * association when the COOKIE is processed or the INIT-ACK is
 424          * processed. Both types of COOKIE's existing and new call this
 425          * routine. It will remove addresses that are no longer in the
 426          * association (for the restarting case where addresses are
 427          * removed). Up front when the INIT arrives we will discard it if it
 428          * is a restart and new addresses have been added.
 429          */
 430         /* sa_ignore MEMLEAK */
 431         return (0);
 432 }
 433
 434 /*
 435  * INIT-ACK message processing/consumption returns value < 0 on error
 436  */
 437 static int
 438 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
 439     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
 440     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
 441     struct sctp_nets *net, int *abort_no_unlock,
 442     uint8_t mflowtype, uint32_t mflowid,
 443     uint32_t vrf_id)
 444 {
 445         struct sctp_association *asoc;
 446         struct mbuf *op_err;
 447         int retval, abort_flag;
 448         uint32_t initack_limit;
 449         int nat_friendly = 0;
 450
 451         /* First verify that we have no illegal param's */
 452         abort_flag = 0;
 453
 454         op_err = sctp_arethere_unrecognized_parameters(m,
 455             (offset + sizeof(struct sctp_init_chunk)),
 456             &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly);
 457         if (abort_flag) {
 458                 /* Send an abort and notify peer */
 459                 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
 460                 *abort_no_unlock = 1;
 461                 return (-1);
 462         }
 463         asoc = &stcb->asoc;
 464         asoc->peer_supports_nat = (uint8_t)nat_friendly;
 465         /* process the peer's parameters in the INIT-ACK */
 466         retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb);
 467         if (retval < 0) {
 468                 return (retval);
 469         }
 470         initack_limit = offset + ntohs(cp->ch.chunk_length);
 471         /* load all addresses */
 472         if ((retval = sctp_load_addresses_from_init(stcb, m,
 473             (offset + sizeof(struct sctp_init_chunk)), initack_limit,
 474             src, dst, NULL, stcb->asoc.port))) {
 475                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 476                     "Problem with address parameters");
 477                 SCTPDBG(SCTP_DEBUG_INPUT1,
 478                     "Load addresses from INIT causes an abort %d\n",
 479                     retval);
 480                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 481                     src, dst, sh, op_err,
 482                     mflowtype, mflowid,
 483                     vrf_id, net->port);
 484                 *abort_no_unlock = 1;
 485                 return (-1);
 486         }
 487         /* if the peer doesn't support asconf, flush the asconf queue */
 488         if (asoc->asconf_supported == 0) {
 489                 struct sctp_asconf_addr *param, *nparam;
 490
 491                 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
 492                         TAILQ_REMOVE(&asoc->asconf_queue, param, next);
 493                         SCTP_FREE(param, SCTP_M_ASC_ADDR);
 494                 }
 495         }
 496
 497         stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
 498             stcb->asoc.local_hmacs);
 499         if (op_err) {
 500                 sctp_queue_op_err(stcb, op_err);
 501                 /* queuing will steal away the mbuf chain to the out queue */
 502                 op_err = NULL;
 503         }
 504         /* extract the cookie and queue it to "echo" it back... */
 505         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 506                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 507                     stcb->asoc.overall_error_count,
 508                     0,
 509                     SCTP_FROM_SCTP_INPUT,
 510                     __LINE__);
 511         }
 512         stcb->asoc.overall_error_count = 0;
 513         net->error_count = 0;
 514
 515         /*
 516          * Cancel the INIT timer, We do this first before queueing the
 517          * cookie. We always cancel at the primary to assue that we are
 518          * canceling the timer started by the INIT which always goes to the
 519          * primary.
 520          */
 521         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
 522             asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 523
 524         /* calculate the RTO */
 525         net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered,
 526             SCTP_RTT_FROM_NON_DATA);
 527         retval = sctp_send_cookie_echo(m, offset, stcb, net);
 528         if (retval < 0) {
 529                 /*
 530                  * No cookie, we probably should send a op error. But in any
 531                  * case if there is no cookie in the INIT-ACK, we can
 532                  * abandon the peer, its broke.
 533                  */
 534                 if (retval == -3) {
 535                         uint16_t len;
 536
 537                         len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t));
 538                         /* We abort with an error of missing mandatory param */
 539                         op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA);
 540                         if (op_err != NULL) {
 541                                 struct sctp_error_missing_param *cause;
 542
 543                                 SCTP_BUF_LEN(op_err) = len;
 544                                 cause = mtod(op_err, struct sctp_error_missing_param *);
 545                                 /* Subtract the reserved param */
 546                                 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM);
 547                                 cause->cause.length = htons(len);
 548                                 cause->num_missing_params = htonl(1);
 549                                 cause->type[0] = htons(SCTP_STATE_COOKIE);
 550                         }
 551                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 552                             src, dst, sh, op_err,
 553                             mflowtype, mflowid,
 554                             vrf_id, net->port);
 555                         *abort_no_unlock = 1;
 556                 }
 557                 return (retval);
 558         }
 559
 560         return (0);
 561 }
 562
 563 static void
 564 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
 565     struct sctp_tcb *stcb, struct sctp_nets *net)
 566 {
 567         union sctp_sockstore store;
 568         struct sctp_nets *r_net, *f_net;
 569         struct timeval tv;
 570         int req_prim = 0;
 571         uint16_t old_error_counter;
 572
 573         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
 574                 /* Invalid length */
 575                 return;
 576         }
 577
 578         memset(&store, 0, sizeof(store));
 579         switch (cp->heartbeat.hb_info.addr_family) {
 580 #ifdef INET
 581         case AF_INET:
 582                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
 583                         store.sin.sin_family = cp->heartbeat.hb_info.addr_family;
 584                         store.sin.sin_len = cp->heartbeat.hb_info.addr_len;
 585                         store.sin.sin_port = stcb->rport;
 586                         memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address,
 587                             sizeof(store.sin.sin_addr));
 588                 } else {
 589                         return;
 590                 }
 591                 break;
 592 #endif
 593 #ifdef INET6
 594         case AF_INET6:
 595                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
 596                         store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family;
 597                         store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len;
 598                         store.sin6.sin6_port = stcb->rport;
 599                         memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr));
 600                 } else {
 601                         return;
 602                 }
 603                 break;
 604 #endif
 605         default:
 606                 return;
 607         }
 608         r_net = sctp_findnet(stcb, &store.sa);
 609         if (r_net == NULL) {
 610                 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
 611                 return;
 612         }
 613         if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 614             (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
 615             (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
 616                 /*
 617                  * If the its a HB and it's random value is correct when can
 618                  * confirm the destination.
 619                  */
 620                 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 621                 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
 622                         stcb->asoc.primary_destination = r_net;
 623                         r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
 624                         f_net = TAILQ_FIRST(&stcb->asoc.nets);
 625                         if (f_net != r_net) {
 626                                 /*
 627                                  * first one on the list is NOT the primary
 628                                  * sctp_cmpaddr() is much more efficient if
 629                                  * the primary is the first on the list,
 630                                  * make it so.
 631                                  */
 632                                 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
 633                                 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
 634                         }
 635                         req_prim = 1;
 636                 }
 637                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 638                     stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 639                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb,
 640                     r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
 641                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 642         }
 643         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 644                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 645                     stcb->asoc.overall_error_count,
 646                     0,
 647                     SCTP_FROM_SCTP_INPUT,
 648                     __LINE__);
 649         }
 650         stcb->asoc.overall_error_count = 0;
 651         old_error_counter = r_net->error_count;
 652         r_net->error_count = 0;
 653         r_net->hb_responded = 1;
 654         tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
 655         tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
 656         /* Now lets do a RTO with this */
 657         r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv,
 658             SCTP_RTT_FROM_NON_DATA);
 659         if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
 660                 r_net->dest_state |= SCTP_ADDR_REACHABLE;
 661                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
 662                     0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 663         }
 664         if (r_net->dest_state & SCTP_ADDR_PF) {
 665                 r_net->dest_state &= ~SCTP_ADDR_PF;
 666                 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
 667         }
 668         if (old_error_counter > 0) {
 669                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
 670                     stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5);
 671                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 672         }
 673         if (r_net == stcb->asoc.primary_destination) {
 674                 if (stcb->asoc.alternate) {
 675                         /* release the alternate, primary is good */
 676                         sctp_free_remote_addr(stcb->asoc.alternate);
 677                         stcb->asoc.alternate = NULL;
 678                 }
 679         }
 680         /* Mobility adaptation */
 681         if (req_prim) {
 682                 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
 683                     SCTP_MOBILITY_BASE) ||
 684                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 685                     SCTP_MOBILITY_FASTHANDOFF)) &&
 686                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 687                     SCTP_MOBILITY_PRIM_DELETED)) {
 688
 689                         sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED,
 690                             stcb->sctp_ep, stcb, NULL,
 691                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 692                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 693                             SCTP_MOBILITY_FASTHANDOFF)) {
 694                                 sctp_assoc_immediate_retrans(stcb,
 695                                     stcb->asoc.primary_destination);
 696                         }
 697                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 698                             SCTP_MOBILITY_BASE)) {
 699                                 sctp_move_chunks_from_net(stcb,
 700                                     stcb->asoc.deleted_primary);
 701                         }
 702                         sctp_delete_prim_timer(stcb->sctp_ep, stcb,
 703                             stcb->asoc.deleted_primary);
 704                 }
 705         }
 706 }
 707
 708 static int
 709 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
 710 {
 711         /*
 712          * return 0 means we want you to proceed with the abort non-zero
 713          * means no abort processing
 714          */
 715         struct sctpasochead *head;
 716
 717         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
 718             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
 719                 atomic_add_int(&stcb->asoc.refcnt, 1);
 720                 SCTP_TCB_UNLOCK(stcb);
 721                 SCTP_INP_INFO_WLOCK();
 722                 SCTP_TCB_LOCK(stcb);
 723                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 724         }
 725         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) {
 726                 /* generate a new vtag and send init */
 727                 LIST_REMOVE(stcb, sctp_asocs);
 728                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 729                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 730                 /*
 731                  * put it in the bucket in the vtag hash of assoc's for the
 732                  * system
 733                  */
 734                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 735                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 736                 SCTP_INP_INFO_WUNLOCK();
 737                 return (1);
 738         }
 739         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) {
 740                 /*
 741                  * treat like a case where the cookie expired i.e.: - dump
 742                  * current cookie. - generate a new vtag. - resend init.
 743                  */
 744                 /* generate a new vtag and send init */
 745                 LIST_REMOVE(stcb, sctp_asocs);
 746                 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
 747                 sctp_stop_all_cookie_timers(stcb);
 748                 sctp_toss_old_cookies(stcb, &stcb->asoc);
 749                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 750                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 751                 /*
 752                  * put it in the bucket in the vtag hash of assoc's for the
 753                  * system
 754                  */
 755                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 756                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 757                 SCTP_INP_INFO_WUNLOCK();
 758                 return (1);
 759         }
 760         return (0);
 761 }
 762
 763 static int
 764 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
 765     struct sctp_nets *net)
 766 {
 767         /*
 768          * return 0 means we want you to proceed with the abort non-zero
 769          * means no abort processing
 770          */
 771         if (stcb->asoc.auth_supported == 0) {
 772                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
 773                 return (0);
 774         }
 775         sctp_asconf_send_nat_state_update(stcb, net);
 776         return (1);
 777 }
 778
 779
 780 /* Returns 1 if the stcb was aborted, 0 otherwise */
 781 static int
 782 sctp_handle_abort(struct sctp_abort_chunk *abort,
 783     struct sctp_tcb *stcb, struct sctp_nets *net)
 784 {
 785 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 786         struct socket *so;
 787 #endif
 788         uint16_t len;
 789         uint16_t error;
 790
 791         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
 792         if (stcb == NULL)
 793                 return (0);
 794
 795         len = ntohs(abort->ch.chunk_length);
 796         if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) {
 797                 /*
 798                  * Need to check the cause codes for our two magic nat
 799                  * aborts which don't kill the assoc necessarily.
 800                  */
 801                 struct sctp_error_cause *cause;
 802
 803                 cause = (struct sctp_error_cause *)(abort + 1);
 804                 error = ntohs(cause->code);
 805                 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) {
 806                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
 807                             abort->ch.chunk_flags);
 808                         if (sctp_handle_nat_colliding_state(stcb)) {
 809                                 return (0);
 810                         }
 811                 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) {
 812                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
 813                             abort->ch.chunk_flags);
 814                         if (sctp_handle_nat_missing_state(stcb, net)) {
 815                                 return (0);
 816                         }
 817                 }
 818         } else {
 819                 error = 0;
 820         }
 821         /* stop any receive timers */
 822         sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net,
 823             SCTP_FROM_SCTP_INPUT + SCTP_LOC_7);
 824         /* notify user of the abort and clean up... */
 825         sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED);
 826         /* free the tcb */
 827         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
 828         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
 829             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 830                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 831         }
 832 #ifdef SCTP_ASOCLOG_OF_TSNS
 833         sctp_print_out_track_log(stcb);
 834 #endif
 835 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 836         so = SCTP_INP_SO(stcb->sctp_ep);
 837         atomic_add_int(&stcb->asoc.refcnt, 1);
 838         SCTP_TCB_UNLOCK(stcb);
 839         SCTP_SOCKET_LOCK(so, 1);
 840         SCTP_TCB_LOCK(stcb);
 841         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 842 #endif
 843         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_WAS_ABORTED);
 844         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 845             SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
 846 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 847         SCTP_SOCKET_UNLOCK(so, 1);
 848 #endif
 849         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
 850         return (1);
 851 }
 852
 853 static void
 854 sctp_start_net_timers(struct sctp_tcb *stcb)
 855 {
 856         uint32_t cnt_hb_sent;
 857         struct sctp_nets *net;
 858
 859         cnt_hb_sent = 0;
 860         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 861                 /*
 862                  * For each network start: 1) A pmtu timer. 2) A HB timer 3)
 863                  * If the dest in unconfirmed send a hb as well if under
 864                  * max_hb_burst have been sent.
 865                  */
 866                 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
 867                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
 868                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
 869                     (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
 870                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 871                         cnt_hb_sent++;
 872                 }
 873         }
 874         if (cnt_hb_sent) {
 875                 sctp_chunk_output(stcb->sctp_ep, stcb,
 876                     SCTP_OUTPUT_FROM_COOKIE_ACK,
 877                     SCTP_SO_NOT_LOCKED);
 878         }
 879 }
 880
 881
 882 static void
 883 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
 884     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
 885 {
 886         struct sctp_association *asoc;
 887         int some_on_streamwheel;
 888         int old_state;
 889 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 890         struct socket *so;
 891 #endif
 892
 893         SCTPDBG(SCTP_DEBUG_INPUT2,
 894             "sctp_handle_shutdown: handling SHUTDOWN\n");
 895         if (stcb == NULL)
 896                 return;
 897         asoc = &stcb->asoc;
 898         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
 899             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
 900                 return;
 901         }
 902         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
 903                 /* Shutdown NOT the expected size */
 904                 return;
 905         }
 906         old_state = SCTP_GET_STATE(stcb);
 907         sctp_update_acked(stcb, cp, abort_flag);
 908         if (*abort_flag) {
 909                 return;
 910         }
 911         if (asoc->control_pdapi) {
 912                 /*
 913                  * With a normal shutdown we assume the end of last record.
 914                  */
 915                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 916                 if (asoc->control_pdapi->on_strm_q) {
 917                         struct sctp_stream_in *strm;
 918
 919                         strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream];
 920                         if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) {
 921                                 /* Unordered */
 922                                 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm);
 923                                 asoc->control_pdapi->on_strm_q = 0;
 924                         } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) {
 925                                 /* Ordered */
 926                                 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm);
 927                                 asoc->control_pdapi->on_strm_q = 0;
 928 #ifdef INVARIANTS
 929                         } else {
 930                                 panic("Unknown state on ctrl:%p on_strm_q:%d",
 931                                     asoc->control_pdapi,
 932                                     asoc->control_pdapi->on_strm_q);
 933 #endif
 934                         }
 935                 }
 936                 asoc->control_pdapi->end_added = 1;
 937                 asoc->control_pdapi->pdapi_aborted = 1;
 938                 asoc->control_pdapi = NULL;
 939                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 940 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 941                 so = SCTP_INP_SO(stcb->sctp_ep);
 942                 atomic_add_int(&stcb->asoc.refcnt, 1);
 943                 SCTP_TCB_UNLOCK(stcb);
 944                 SCTP_SOCKET_LOCK(so, 1);
 945                 SCTP_TCB_LOCK(stcb);
 946                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 947                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 948                         /* assoc was freed while we were unlocked */
 949                         SCTP_SOCKET_UNLOCK(so, 1);
 950                         return;
 951                 }
 952 #endif
 953                 if (stcb->sctp_socket) {
 954                         sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 955                 }
 956 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 957                 SCTP_SOCKET_UNLOCK(so, 1);
 958 #endif
 959         }
 960         /* goto SHUTDOWN_RECEIVED state to block new requests */
 961         if (stcb->sctp_socket) {
 962                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 963                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
 964                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) {
 965                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_RECEIVED);
 966                         /*
 967                          * notify upper layer that peer has initiated a
 968                          * shutdown
 969                          */
 970                         sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 971
 972                         /* reset time */
 973                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
 974                 }
 975         }
 976         if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) {
 977                 /*
 978                  * stop the shutdown timer, since we WILL move to
 979                  * SHUTDOWN-ACK-SENT.
 980                  */
 981                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
 982                     net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
 983         }
 984         /* Now is there unsent data on a stream somewhere? */
 985         some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
 986
 987         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 988             !TAILQ_EMPTY(&asoc->sent_queue) ||
 989             some_on_streamwheel) {
 990                 /* By returning we will push more data out */
 991                 return;
 992         } else {
 993                 /* no outstanding data to send, so move on... */
 994                 /* send SHUTDOWN-ACK */
 995                 /* move to SHUTDOWN-ACK-SENT state */
 996                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
 997                     (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 998                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 999                 }
1000                 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
1001                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_ACK_SENT);
1002                         sctp_stop_timers_for_shutdown(stcb);
1003                         sctp_send_shutdown_ack(stcb, net);
1004                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
1005                             stcb->sctp_ep, stcb, net);
1006                 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1007                         sctp_send_shutdown_ack(stcb, net);
1008                 }
1009         }
1010 }
1011
1012 static void
1013 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
1014     struct sctp_tcb *stcb,
1015     struct sctp_nets *net)
1016 {
1017         struct sctp_association *asoc;
1018 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1019         struct socket *so;
1020
1021         so = SCTP_INP_SO(stcb->sctp_ep);
1022 #endif
1023         SCTPDBG(SCTP_DEBUG_INPUT2,
1024             "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
1025         if (stcb == NULL)
1026                 return;
1027
1028         asoc = &stcb->asoc;
1029         /* process according to association state */
1030         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
1031             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
1032                 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
1033                 sctp_send_shutdown_complete(stcb, net, 1);
1034                 SCTP_TCB_UNLOCK(stcb);
1035                 return;
1036         }
1037         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
1038             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
1039                 /* unexpected SHUTDOWN-ACK... so ignore... */
1040                 SCTP_TCB_UNLOCK(stcb);
1041                 return;
1042         }
1043         if (asoc->control_pdapi) {
1044                 /*
1045                  * With a normal shutdown we assume the end of last record.
1046                  */
1047                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
1048                 asoc->control_pdapi->end_added = 1;
1049                 asoc->control_pdapi->pdapi_aborted = 1;
1050                 asoc->control_pdapi = NULL;
1051                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
1052 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1053                 atomic_add_int(&stcb->asoc.refcnt, 1);
1054                 SCTP_TCB_UNLOCK(stcb);
1055                 SCTP_SOCKET_LOCK(so, 1);
1056                 SCTP_TCB_LOCK(stcb);
1057                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1058                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1059                         /* assoc was freed while we were unlocked */
1060                         SCTP_SOCKET_UNLOCK(so, 1);
1061                         return;
1062                 }
1063 #endif
1064                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
1065 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1066                 SCTP_SOCKET_UNLOCK(so, 1);
1067 #endif
1068         }
1069 #ifdef INVARIANTS
1070         if (!TAILQ_EMPTY(&asoc->send_queue) ||
1071             !TAILQ_EMPTY(&asoc->sent_queue) ||
1072             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
1073                 panic("Queues are not empty when handling SHUTDOWN-ACK");
1074         }
1075 #endif
1076         /* stop the timer */
1077         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net,
1078             SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
1079         /* send SHUTDOWN-COMPLETE */
1080         sctp_send_shutdown_complete(stcb, net, 0);
1081         /* notify upper layer protocol */
1082         if (stcb->sctp_socket) {
1083                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1084                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
1085                         stcb->sctp_socket->so_snd.sb_cc = 0;
1086                 }
1087                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
1088         }
1089         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1090         /* free the TCB but first save off the ep */
1091 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1092         atomic_add_int(&stcb->asoc.refcnt, 1);
1093         SCTP_TCB_UNLOCK(stcb);
1094         SCTP_SOCKET_LOCK(so, 1);
1095         SCTP_TCB_LOCK(stcb);
1096         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1097 #endif
1098         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1099             SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1100 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1101         SCTP_SOCKET_UNLOCK(so, 1);
1102 #endif
1103 }
1104
1105 static void
1106 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type,
1107     struct sctp_nets *net)
1108 {
1109         switch (chunk_type) {
1110         case SCTP_ASCONF_ACK:
1111         case SCTP_ASCONF:
1112                 sctp_asconf_cleanup(stcb, net);
1113                 break;
1114         case SCTP_IFORWARD_CUM_TSN:
1115         case SCTP_FORWARD_CUM_TSN:
1116                 stcb->asoc.prsctp_supported = 0;
1117                 break;
1118         default:
1119                 SCTPDBG(SCTP_DEBUG_INPUT2,
1120                     "Peer does not support chunk type %d (0x%x).\n",
1121                     chunk_type, chunk_type);
1122                 break;
1123         }
1124 }
1125
1126 /*
1127  * Skip past the param header and then we will find the param that caused the
1128  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1129  * these will turn of specific features.
1130  * XXX: Is this the right thing to do?
1131  */
1132 static void
1133 sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type)
1134 {
1135         switch (parameter_type) {
1136                 /* pr-sctp draft */
1137         case SCTP_PRSCTP_SUPPORTED:
1138                 stcb->asoc.prsctp_supported = 0;
1139                 break;
1140         case SCTP_SUPPORTED_CHUNK_EXT:
1141                 break;
1142                 /* draft-ietf-tsvwg-addip-sctp */
1143         case SCTP_HAS_NAT_SUPPORT:
1144                 stcb->asoc.peer_supports_nat = 0;
1145                 break;
1146         case SCTP_ADD_IP_ADDRESS:
1147         case SCTP_DEL_IP_ADDRESS:
1148         case SCTP_SET_PRIM_ADDR:
1149                 stcb->asoc.asconf_supported = 0;
1150                 break;
1151         case SCTP_SUCCESS_REPORT:
1152         case SCTP_ERROR_CAUSE_IND:
1153                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1154                 SCTPDBG(SCTP_DEBUG_INPUT2,
1155                     "Turning off ASCONF to this strange peer\n");
1156                 stcb->asoc.asconf_supported = 0;
1157                 break;
1158         default:
1159                 SCTPDBG(SCTP_DEBUG_INPUT2,
1160                     "Peer does not support param type %d (0x%x)??\n",
1161                     parameter_type, parameter_type);
1162                 break;
1163         }
1164 }
1165
1166 static int
1167 sctp_handle_error(struct sctp_chunkhdr *ch,
1168     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
1169 {
1170         struct sctp_error_cause *cause;
1171         struct sctp_association *asoc;
1172         uint32_t remaining_length, adjust;
1173         uint16_t code, cause_code, cause_length;
1174 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1175         struct socket *so;
1176 #endif
1177
1178         /* parse through all of the errors and process */
1179         asoc = &stcb->asoc;
1180         cause = (struct sctp_error_cause *)((caddr_t)ch +
1181             sizeof(struct sctp_chunkhdr));
1182         remaining_length = ntohs(ch->chunk_length);
1183         if (remaining_length > limit) {
1184                 remaining_length = limit;
1185         }
1186         if (remaining_length >= sizeof(struct sctp_chunkhdr)) {
1187                 remaining_length -= sizeof(struct sctp_chunkhdr);
1188         } else {
1189                 remaining_length = 0;
1190         }
1191         code = 0;
1192         while (remaining_length >= sizeof(struct sctp_error_cause)) {
1193                 /* Process an Error Cause */
1194                 cause_code = ntohs(cause->code);
1195                 cause_length = ntohs(cause->length);
1196                 if ((cause_length > remaining_length) || (cause_length == 0)) {
1197                         /* Invalid cause length, possibly due to truncation. */
1198                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n",
1199                             remaining_length, cause_length);
1200                         return (0);
1201                 }
1202                 if (code == 0) {
1203                         /* report the first error cause */
1204                         code = cause_code;
1205                 }
1206                 switch (cause_code) {
1207                 case SCTP_CAUSE_INVALID_STREAM:
1208                 case SCTP_CAUSE_MISSING_PARAM:
1209                 case SCTP_CAUSE_INVALID_PARAM:
1210                 case SCTP_CAUSE_NO_USER_DATA:
1211                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n",
1212                             cause_code);
1213                         break;
1214                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1215                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags: %x\n",
1216                             ch->chunk_flags);
1217                         if (sctp_handle_nat_colliding_state(stcb)) {
1218                                 return (0);
1219                         }
1220                         break;
1221                 case SCTP_CAUSE_NAT_MISSING_STATE:
1222                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags: %x\n",
1223                             ch->chunk_flags);
1224                         if (sctp_handle_nat_missing_state(stcb, net)) {
1225                                 return (0);
1226                         }
1227                         break;
1228                 case SCTP_CAUSE_STALE_COOKIE:
1229                         /*
1230                          * We only act if we have echoed a cookie and are
1231                          * waiting.
1232                          */
1233                         if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) &&
1234                             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
1235                                 struct sctp_error_stale_cookie *stale_cookie;
1236
1237                                 stale_cookie = (struct sctp_error_stale_cookie *)cause;
1238                                 asoc->cookie_preserve_req = ntohl(stale_cookie->stale_time);
1239                                 /* Double it to be more robust on RTX */
1240                                 if (asoc->cookie_preserve_req <= UINT32_MAX / 2) {
1241                                         asoc->cookie_preserve_req *= 2;
1242                                 } else {
1243                                         asoc->cookie_preserve_req = UINT32_MAX;
1244                                 }
1245                                 asoc->stale_cookie_count++;
1246                                 if (asoc->stale_cookie_count >
1247                                     asoc->max_init_times) {
1248                                         sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED);
1249                                         /* now free the asoc */
1250 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1251                                         so = SCTP_INP_SO(stcb->sctp_ep);
1252                                         atomic_add_int(&stcb->asoc.refcnt, 1);
1253                                         SCTP_TCB_UNLOCK(stcb);
1254                                         SCTP_SOCKET_LOCK(so, 1);
1255                                         SCTP_TCB_LOCK(stcb);
1256                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1257 #endif
1258                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1259                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1260 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1261                                         SCTP_SOCKET_UNLOCK(so, 1);
1262 #endif
1263                                         return (-1);
1264                                 }
1265                                 /* blast back to INIT state */
1266                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
1267                                 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
1268                                 sctp_stop_all_cookie_timers(stcb);
1269                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1270                         }
1271                         break;
1272                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1273                         /*
1274                          * Nothing we can do here, we don't do hostname
1275                          * addresses so if the peer does not like my IPv6
1276                          * (or IPv4 for that matter) it does not matter. If
1277                          * they don't support that type of address, they can
1278                          * NOT possibly get that packet type... i.e. with no
1279                          * IPv6 you can't receive a IPv6 packet. so we can
1280                          * safely ignore this one. If we ever added support
1281                          * for HOSTNAME Addresses, then we would need to do
1282                          * something here.
1283                          */
1284                         break;
1285                 case SCTP_CAUSE_UNRECOG_CHUNK:
1286                         if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) {
1287                                 struct sctp_error_unrecognized_chunk *unrec_chunk;
1288
1289                                 unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause;
1290                                 sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type, net);
1291                         }
1292                         break;
1293                 case SCTP_CAUSE_UNRECOG_PARAM:
1294                         /* XXX: We only consider the first parameter */
1295                         if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) {
1296                                 struct sctp_paramhdr *unrec_parameter;
1297
1298                                 unrec_parameter = (struct sctp_paramhdr *)(cause + 1);
1299                                 sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type));
1300                         }
1301                         break;
1302                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1303                         /*
1304                          * We ignore this since the timer will drive out a
1305                          * new cookie anyway and there timer will drive us
1306                          * to send a SHUTDOWN_COMPLETE. We can't send one
1307                          * here since we don't have their tag.
1308                          */
1309                         break;
1310                 case SCTP_CAUSE_DELETING_LAST_ADDR:
1311                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1312                 case SCTP_CAUSE_DELETING_SRC_ADDR:
1313                         /*
1314                          * We should NOT get these here, but in a
1315                          * ASCONF-ACK.
1316                          */
1317                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n",
1318                             cause_code);
1319                         break;
1320                 case SCTP_CAUSE_OUT_OF_RESC:
1321                         /*
1322                          * And what, pray tell do we do with the fact that
1323                          * the peer is out of resources? Not really sure we
1324                          * could do anything but abort. I suspect this
1325                          * should have came WITH an abort instead of in a
1326                          * OP-ERROR.
1327                          */
1328                         break;
1329                 default:
1330                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n",
1331                             cause_code);
1332                         break;
1333                 }
1334                 adjust = SCTP_SIZE32(cause_length);
1335                 if (remaining_length >= adjust) {
1336                         remaining_length -= adjust;
1337                 } else {
1338                         remaining_length = 0;
1339                 }
1340                 cause = (struct sctp_error_cause *)((caddr_t)cause + adjust);
1341         }
1342         sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED);
1343         return (0);
1344 }
1345
1346 static int
1347 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1348     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
1349     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1350     struct sctp_nets *net, int *abort_no_unlock,
1351     uint8_t mflowtype, uint32_t mflowid,
1352     uint32_t vrf_id)
1353 {
1354         struct sctp_init_ack *init_ack;
1355         struct mbuf *op_err;
1356
1357         SCTPDBG(SCTP_DEBUG_INPUT2,
1358             "sctp_handle_init_ack: handling INIT-ACK\n");
1359
1360         if (stcb == NULL) {
1361                 SCTPDBG(SCTP_DEBUG_INPUT2,
1362                     "sctp_handle_init_ack: TCB is null\n");
1363                 return (-1);
1364         }
1365         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1366                 /* Invalid length */
1367                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1368                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1369                     src, dst, sh, op_err,
1370                     mflowtype, mflowid,
1371                     vrf_id, net->port);
1372                 *abort_no_unlock = 1;
1373                 return (-1);
1374         }
1375         init_ack = &cp->init;
1376         /* validate parameters */
1377         if (init_ack->initiate_tag == 0) {
1378                 /* protocol error... send an abort */
1379                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1380                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1381                     src, dst, sh, op_err,
1382                     mflowtype, mflowid,
1383                     vrf_id, net->port);
1384                 *abort_no_unlock = 1;
1385                 return (-1);
1386         }
1387         if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1388                 /* protocol error... send an abort */
1389                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1390                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1391                     src, dst, sh, op_err,
1392                     mflowtype, mflowid,
1393                     vrf_id, net->port);
1394                 *abort_no_unlock = 1;
1395                 return (-1);
1396         }
1397         if (init_ack->num_inbound_streams == 0) {
1398                 /* protocol error... send an abort */
1399                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1400                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1401                     src, dst, sh, op_err,
1402                     mflowtype, mflowid,
1403                     vrf_id, net->port);
1404                 *abort_no_unlock = 1;
1405                 return (-1);
1406         }
1407         if (init_ack->num_outbound_streams == 0) {
1408                 /* protocol error... send an abort */
1409                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1410                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1411                     src, dst, sh, op_err,
1412                     mflowtype, mflowid,
1413                     vrf_id, net->port);
1414                 *abort_no_unlock = 1;
1415                 return (-1);
1416         }
1417         /* process according to association state... */
1418         switch (SCTP_GET_STATE(stcb)) {
1419         case SCTP_STATE_COOKIE_WAIT:
1420                 /* this is the expected state for this chunk */
1421                 /* process the INIT-ACK parameters */
1422                 if (stcb->asoc.primary_destination->dest_state &
1423                     SCTP_ADDR_UNCONFIRMED) {
1424                         /*
1425                          * The primary is where we sent the INIT, we can
1426                          * always consider it confirmed when the INIT-ACK is
1427                          * returned. Do this before we load addresses
1428                          * though.
1429                          */
1430                         stcb->asoc.primary_destination->dest_state &=
1431                             ~SCTP_ADDR_UNCONFIRMED;
1432                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1433                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1434                 }
1435                 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
1436                     net, abort_no_unlock,
1437                     mflowtype, mflowid,
1438                     vrf_id) < 0) {
1439                         /* error in parsing parameters */
1440                         return (-1);
1441                 }
1442                 /* update our state */
1443                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1444                 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_ECHOED);
1445
1446                 /* reset the RTO calc */
1447                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1448                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1449                             stcb->asoc.overall_error_count,
1450                             0,
1451                             SCTP_FROM_SCTP_INPUT,
1452                             __LINE__);
1453                 }
1454                 stcb->asoc.overall_error_count = 0;
1455                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1456                 /*
1457                  * collapse the init timer back in case of a exponential
1458                  * backoff
1459                  */
1460                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1461                     stcb, net);
1462                 /*
1463                  * the send at the end of the inbound data processing will
1464                  * cause the cookie to be sent
1465                  */
1466                 break;
1467         case SCTP_STATE_SHUTDOWN_SENT:
1468                 /* incorrect state... discard */
1469                 break;
1470         case SCTP_STATE_COOKIE_ECHOED:
1471                 /* incorrect state... discard */
1472                 break;
1473         case SCTP_STATE_OPEN:
1474                 /* incorrect state... discard */
1475                 break;
1476         case SCTP_STATE_EMPTY:
1477         case SCTP_STATE_INUSE:
1478         default:
1479                 /* incorrect state... discard */
1480                 return (-1);
1481                 break;
1482         }
1483         SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1484         return (0);
1485 }
1486
1487 static struct sctp_tcb *
1488 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1489     struct sockaddr *src, struct sockaddr *dst,
1490     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1491     struct sctp_inpcb *inp, struct sctp_nets **netp,
1492     struct sockaddr *init_src, int *notification,
1493     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1494     uint8_t mflowtype, uint32_t mflowid,
1495     uint32_t vrf_id, uint16_t port);
1496
1497
1498 /*
1499  * handle a state cookie for an existing association m: input packet mbuf
1500  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1501  * "split" mbuf and the cookie signature does not exist offset: offset into
1502  * mbuf to the cookie-echo chunk
1503  */
1504 static struct sctp_tcb *
1505 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1506     struct sockaddr *src, struct sockaddr *dst,
1507     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1508     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1509     struct sockaddr *init_src, int *notification,
1510     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1511     uint8_t mflowtype, uint32_t mflowid,
1512     uint32_t vrf_id, uint16_t port)
1513 {
1514         struct sctp_association *asoc;
1515         struct sctp_init_chunk *init_cp, init_buf;
1516         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1517         struct sctp_nets *net;
1518         struct mbuf *op_err;
1519         struct timeval old;
1520         int init_offset, initack_offset, i;
1521         int retval;
1522         int spec_flag = 0;
1523         uint32_t how_indx;
1524 #if defined(SCTP_DETAILED_STR_STATS)
1525         int j;
1526 #endif
1527
1528         net = *netp;
1529         /* I know that the TCB is non-NULL from the caller */
1530         asoc = &stcb->asoc;
1531         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1532                 if (asoc->cookie_how[how_indx] == 0)
1533                         break;
1534         }
1535         if (how_indx < sizeof(asoc->cookie_how)) {
1536                 asoc->cookie_how[how_indx] = 1;
1537         }
1538         if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1539                 /* SHUTDOWN came in after sending INIT-ACK */
1540                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1541                 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, "");
1542                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
1543                     mflowtype, mflowid, inp->fibnum,
1544                     vrf_id, net->port);
1545                 if (how_indx < sizeof(asoc->cookie_how))
1546                         asoc->cookie_how[how_indx] = 2;
1547                 return (NULL);
1548         }
1549         /*
1550          * find and validate the INIT chunk in the cookie (peer's info) the
1551          * INIT should start after the cookie-echo header struct (chunk
1552          * header, state cookie header struct)
1553          */
1554         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1555
1556         init_cp = (struct sctp_init_chunk *)
1557             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1558             (uint8_t *)&init_buf);
1559         if (init_cp == NULL) {
1560                 /* could not pull a INIT chunk in cookie */
1561                 return (NULL);
1562         }
1563         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1564                 return (NULL);
1565         }
1566         /*
1567          * find and validate the INIT-ACK chunk in the cookie (my info) the
1568          * INIT-ACK follows the INIT chunk
1569          */
1570         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1571         initack_cp = (struct sctp_init_ack_chunk *)
1572             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1573             (uint8_t *)&initack_buf);
1574         if (initack_cp == NULL) {
1575                 /* could not pull INIT-ACK chunk in cookie */
1576                 return (NULL);
1577         }
1578         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1579                 return (NULL);
1580         }
1581         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1582             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1583                 /*
1584                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
1585                  * to get into the OPEN state
1586                  */
1587                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1588                         /*-
1589                          * Opps, this means that we somehow generated two vtag's
1590                          * the same. I.e. we did:
1591                          *  Us               Peer
1592                          *   <---INIT(tag=a)------
1593                          *   ----INIT-ACK(tag=t)-->
1594                          *   ----INIT(tag=t)------> *1
1595                          *   <---INIT-ACK(tag=a)---
1596                          *   <----CE(tag=t)------------- *2
1597                          *
1598                          * At point *1 we should be generating a different
1599                          * tag t'. Which means we would throw away the CE and send
1600                          * ours instead. Basically this is case C (throw away side).
1601                          */
1602                         if (how_indx < sizeof(asoc->cookie_how))
1603                                 asoc->cookie_how[how_indx] = 17;
1604                         return (NULL);
1605
1606                 }
1607                 switch (SCTP_GET_STATE(stcb)) {
1608                 case SCTP_STATE_COOKIE_WAIT:
1609                 case SCTP_STATE_COOKIE_ECHOED:
1610                         /*
1611                          * INIT was sent but got a COOKIE_ECHO with the
1612                          * correct tags... just accept it...but we must
1613                          * process the init so that we can make sure we have
1614                          * the right seq no's.
1615                          */
1616                         /* First we must process the INIT !! */
1617                         retval = sctp_process_init(init_cp, stcb);
1618                         if (retval < 0) {
1619                                 if (how_indx < sizeof(asoc->cookie_how))
1620                                         asoc->cookie_how[how_indx] = 3;
1621                                 return (NULL);
1622                         }
1623                         /* we have already processed the INIT so no problem */
1624                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp,
1625                             stcb, net,
1626                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1627                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp,
1628                             stcb, net,
1629                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1630                         /* update current state */
1631                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)
1632                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1633                         else
1634                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1635
1636                         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1637                         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1638                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1639                                     stcb->sctp_ep, stcb, asoc->primary_destination);
1640                         }
1641                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1642                         sctp_stop_all_cookie_timers(stcb);
1643                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1644                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1645                             (!SCTP_IS_LISTENING(inp))) {
1646 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1647                                 struct socket *so;
1648 #endif
1649                                 /*
1650                                  * Here is where collision would go if we
1651                                  * did a connect() and instead got a
1652                                  * init/init-ack/cookie done before the
1653                                  * init-ack came back..
1654                                  */
1655                                 stcb->sctp_ep->sctp_flags |=
1656                                     SCTP_PCB_FLAGS_CONNECTED;
1657 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1658                                 so = SCTP_INP_SO(stcb->sctp_ep);
1659                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1660                                 SCTP_TCB_UNLOCK(stcb);
1661                                 SCTP_SOCKET_LOCK(so, 1);
1662                                 SCTP_TCB_LOCK(stcb);
1663                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1664                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1665                                         SCTP_SOCKET_UNLOCK(so, 1);
1666                                         return (NULL);
1667                                 }
1668 #endif
1669                                 soisconnected(stcb->sctp_socket);
1670 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1671                                 SCTP_SOCKET_UNLOCK(so, 1);
1672 #endif
1673                         }
1674                         /* notify upper layer */
1675                         *notification = SCTP_NOTIFY_ASSOC_UP;
1676                         /*
1677                          * since we did not send a HB make sure we don't
1678                          * double things
1679                          */
1680                         old.tv_sec = cookie->time_entered.tv_sec;
1681                         old.tv_usec = cookie->time_entered.tv_usec;
1682                         net->hb_responded = 1;
1683                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
1684                             &old,
1685                             SCTP_RTT_FROM_NON_DATA);
1686
1687                         if (stcb->asoc.sctp_autoclose_ticks &&
1688                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1689                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1690                                     inp, stcb, NULL);
1691                         }
1692                         break;
1693                 default:
1694                         /*
1695                          * we're in the OPEN state (or beyond), so peer must
1696                          * have simply lost the COOKIE-ACK
1697                          */
1698                         break;
1699                 }               /* end switch */
1700                 sctp_stop_all_cookie_timers(stcb);
1701                 /*
1702                  * We ignore the return code here.. not sure if we should
1703                  * somehow abort.. but we do have an existing asoc. This
1704                  * really should not fail.
1705                  */
1706                 if (sctp_load_addresses_from_init(stcb, m,
1707                     init_offset + sizeof(struct sctp_init_chunk),
1708                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
1709                         if (how_indx < sizeof(asoc->cookie_how))
1710                                 asoc->cookie_how[how_indx] = 4;
1711                         return (NULL);
1712                 }
1713                 /* respond with a COOKIE-ACK */
1714                 sctp_toss_old_cookies(stcb, asoc);
1715                 sctp_send_cookie_ack(stcb);
1716                 if (how_indx < sizeof(asoc->cookie_how))
1717                         asoc->cookie_how[how_indx] = 5;
1718                 return (stcb);
1719         }
1720
1721         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1722             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1723             cookie->tie_tag_my_vtag == 0 &&
1724             cookie->tie_tag_peer_vtag == 0) {
1725                 /*
1726                  * case C in Section 5.2.4 Table 2: XMOO silently discard
1727                  */
1728                 if (how_indx < sizeof(asoc->cookie_how))
1729                         asoc->cookie_how[how_indx] = 6;
1730                 return (NULL);
1731         }
1732         /*
1733          * If nat support, and the below and stcb is established, send back
1734          * a ABORT(colliding state) if we are established.
1735          */
1736         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) &&
1737             (asoc->peer_supports_nat) &&
1738             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1739             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1740             (asoc->peer_vtag == 0)))) {
1741                 /*
1742                  * Special case - Peer's support nat. We may have two init's
1743                  * that we gave out the same tag on since one was not
1744                  * established.. i.e. we get INIT from host-1 behind the nat
1745                  * and we respond tag-a, we get a INIT from host-2 behind
1746                  * the nat and we get tag-a again. Then we bring up host-1
1747                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1748                  * Now we have colliding state. We must send an abort here
1749                  * with colliding state indication.
1750                  */
1751                 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, "");
1752                 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
1753                     mflowtype, mflowid, inp->fibnum,
1754                     vrf_id, port);
1755                 return (NULL);
1756         }
1757         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1758             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1759             (asoc->peer_vtag == 0))) {
1760                 /*
1761                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1762                  * should be ok, re-accept peer info
1763                  */
1764                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1765                         /*
1766                          * Extension of case C. If we hit this, then the
1767                          * random number generator returned the same vtag
1768                          * when we first sent our INIT-ACK and when we later
1769                          * sent our INIT. The side with the seq numbers that
1770                          * are different will be the one that normnally
1771                          * would have hit case C. This in effect "extends"
1772                          * our vtags in this collision case to be 64 bits.
1773                          * The same collision could occur aka you get both
1774                          * vtag and seq number the same twice in a row.. but
1775                          * is much less likely. If it did happen then we
1776                          * would proceed through and bring up the assoc.. we
1777                          * may end up with the wrong stream setup however..
1778                          * which would be bad.. but there is no way to
1779                          * tell.. until we send on a stream that does not
1780                          * exist :-)
1781                          */
1782                         if (how_indx < sizeof(asoc->cookie_how))
1783                                 asoc->cookie_how[how_indx] = 7;
1784
1785                         return (NULL);
1786                 }
1787                 if (how_indx < sizeof(asoc->cookie_how))
1788                         asoc->cookie_how[how_indx] = 8;
1789                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1790                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1791                 sctp_stop_all_cookie_timers(stcb);
1792                 /*
1793                  * since we did not send a HB make sure we don't double
1794                  * things
1795                  */
1796                 net->hb_responded = 1;
1797                 if (stcb->asoc.sctp_autoclose_ticks &&
1798                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1799                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1800                             NULL);
1801                 }
1802                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1803                 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1804
1805                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1806                         /*
1807                          * Ok the peer probably discarded our data (if we
1808                          * echoed a cookie+data). So anything on the
1809                          * sent_queue should be marked for retransmit, we
1810                          * may not get something to kick us so it COULD
1811                          * still take a timeout to move these.. but it can't
1812                          * hurt to mark them.
1813                          */
1814                         struct sctp_tmit_chunk *chk;
1815
1816                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1817                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1818                                         chk->sent = SCTP_DATAGRAM_RESEND;
1819                                         sctp_flight_size_decrease(chk);
1820                                         sctp_total_flight_decrease(stcb, chk);
1821                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1822                                         spec_flag++;
1823                                 }
1824                         }
1825
1826                 }
1827                 /* process the INIT info (peer's info) */
1828                 retval = sctp_process_init(init_cp, stcb);
1829                 if (retval < 0) {
1830                         if (how_indx < sizeof(asoc->cookie_how))
1831                                 asoc->cookie_how[how_indx] = 9;
1832                         return (NULL);
1833                 }
1834                 if (sctp_load_addresses_from_init(stcb, m,
1835                     init_offset + sizeof(struct sctp_init_chunk),
1836                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
1837                         if (how_indx < sizeof(asoc->cookie_how))
1838                                 asoc->cookie_how[how_indx] = 10;
1839                         return (NULL);
1840                 }
1841                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
1842                     (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
1843                         *notification = SCTP_NOTIFY_ASSOC_UP;
1844
1845                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1846                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1847                             (!SCTP_IS_LISTENING(inp))) {
1848 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1849                                 struct socket *so;
1850 #endif
1851                                 stcb->sctp_ep->sctp_flags |=
1852                                     SCTP_PCB_FLAGS_CONNECTED;
1853 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1854                                 so = SCTP_INP_SO(stcb->sctp_ep);
1855                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1856                                 SCTP_TCB_UNLOCK(stcb);
1857                                 SCTP_SOCKET_LOCK(so, 1);
1858                                 SCTP_TCB_LOCK(stcb);
1859                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1860                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1861                                         SCTP_SOCKET_UNLOCK(so, 1);
1862                                         return (NULL);
1863                                 }
1864 #endif
1865                                 soisconnected(stcb->sctp_socket);
1866 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1867                                 SCTP_SOCKET_UNLOCK(so, 1);
1868 #endif
1869                         }
1870                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)
1871                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1872                         else
1873                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1874                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1875                 } else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
1876                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1877                 } else {
1878                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1879                 }
1880                 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1881                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1882                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1883                             stcb->sctp_ep, stcb, asoc->primary_destination);
1884                 }
1885                 sctp_stop_all_cookie_timers(stcb);
1886                 sctp_toss_old_cookies(stcb, asoc);
1887                 sctp_send_cookie_ack(stcb);
1888                 if (spec_flag) {
1889                         /*
1890                          * only if we have retrans set do we do this. What
1891                          * this call does is get only the COOKIE-ACK out and
1892                          * then when we return the normal call to
1893                          * sctp_chunk_output will get the retrans out behind
1894                          * this.
1895                          */
1896                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1897                 }
1898                 if (how_indx < sizeof(asoc->cookie_how))
1899                         asoc->cookie_how[how_indx] = 11;
1900
1901                 return (stcb);
1902         }
1903         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1904             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1905             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1906             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1907             cookie->tie_tag_peer_vtag != 0) {
1908                 struct sctpasochead *head;
1909 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1910                 struct socket *so;
1911 #endif
1912
1913                 if (asoc->peer_supports_nat) {
1914                         /*
1915                          * This is a gross gross hack. Just call the
1916                          * cookie_new code since we are allowing a duplicate
1917                          * association. I hope this works...
1918                          */
1919                         return (sctp_process_cookie_new(m, iphlen, offset, src, dst,
1920                             sh, cookie, cookie_len,
1921                             inp, netp, init_src, notification,
1922                             auth_skipped, auth_offset, auth_len,
1923                             mflowtype, mflowid,
1924                             vrf_id, port));
1925                 }
1926                 /*
1927                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1928                  */
1929                 /* temp code */
1930                 if (how_indx < sizeof(asoc->cookie_how))
1931                         asoc->cookie_how[how_indx] = 12;
1932                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net,
1933                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1934                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1935                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
1936
1937                 /* notify upper layer */
1938                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1939                 atomic_add_int(&stcb->asoc.refcnt, 1);
1940                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) &&
1941                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1942                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) {
1943                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1944                 }
1945                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
1946                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1947                 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
1948                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1949                 }
1950                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1951                         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1952                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1953                             stcb->sctp_ep, stcb, asoc->primary_destination);
1954
1955                 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
1956                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1957                         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1958                 }
1959                 asoc->pre_open_streams =
1960                     ntohs(initack_cp->init.num_outbound_streams);
1961                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1962                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1963                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1964
1965                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1966
1967                 asoc->str_reset_seq_in = asoc->init_seq_number;
1968
1969                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1970                 if (asoc->mapping_array) {
1971                         memset(asoc->mapping_array, 0,
1972                             asoc->mapping_array_size);
1973                 }
1974                 if (asoc->nr_mapping_array) {
1975                         memset(asoc->nr_mapping_array, 0,
1976                             asoc->mapping_array_size);
1977                 }
1978                 SCTP_TCB_UNLOCK(stcb);
1979 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1980                 so = SCTP_INP_SO(stcb->sctp_ep);
1981                 SCTP_SOCKET_LOCK(so, 1);
1982 #endif
1983                 SCTP_INP_INFO_WLOCK();
1984                 SCTP_INP_WLOCK(stcb->sctp_ep);
1985                 SCTP_TCB_LOCK(stcb);
1986                 atomic_add_int(&stcb->asoc.refcnt, -1);
1987                 /* send up all the data */
1988                 SCTP_TCB_SEND_LOCK(stcb);
1989
1990                 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED);
1991                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1992                         stcb->asoc.strmout[i].chunks_on_queues = 0;
1993 #if defined(SCTP_DETAILED_STR_STATS)
1994                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
1995                                 asoc->strmout[i].abandoned_sent[j] = 0;
1996                                 asoc->strmout[i].abandoned_unsent[j] = 0;
1997                         }
1998 #else
1999                         asoc->strmout[i].abandoned_sent[0] = 0;
2000                         asoc->strmout[i].abandoned_unsent[0] = 0;
2001 #endif
2002                         stcb->asoc.strmout[i].sid = i;
2003                         stcb->asoc.strmout[i].next_mid_ordered = 0;
2004                         stcb->asoc.strmout[i].next_mid_unordered = 0;
2005                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
2006                 }
2007                 /* process the INIT-ACK info (my info) */
2008                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2009                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2010
2011                 /* pull from vtag hash */
2012                 LIST_REMOVE(stcb, sctp_asocs);
2013                 /* re-insert to new vtag position */
2014                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
2015                     SCTP_BASE_INFO(hashasocmark))];
2016                 /*
2017                  * put it in the bucket in the vtag hash of assoc's for the
2018                  * system
2019                  */
2020                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
2021
2022                 SCTP_TCB_SEND_UNLOCK(stcb);
2023                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
2024                 SCTP_INP_INFO_WUNLOCK();
2025 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2026                 SCTP_SOCKET_UNLOCK(so, 1);
2027 #endif
2028                 asoc->total_flight = 0;
2029                 asoc->total_flight_count = 0;
2030                 /* process the INIT info (peer's info) */
2031                 retval = sctp_process_init(init_cp, stcb);
2032                 if (retval < 0) {
2033                         if (how_indx < sizeof(asoc->cookie_how))
2034                                 asoc->cookie_how[how_indx] = 13;
2035
2036                         return (NULL);
2037                 }
2038                 /*
2039                  * since we did not send a HB make sure we don't double
2040                  * things
2041                  */
2042                 net->hb_responded = 1;
2043
2044                 if (sctp_load_addresses_from_init(stcb, m,
2045                     init_offset + sizeof(struct sctp_init_chunk),
2046                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
2047                         if (how_indx < sizeof(asoc->cookie_how))
2048                                 asoc->cookie_how[how_indx] = 14;
2049
2050                         return (NULL);
2051                 }
2052                 /* respond with a COOKIE-ACK */
2053                 sctp_stop_all_cookie_timers(stcb);
2054                 sctp_toss_old_cookies(stcb, asoc);
2055                 sctp_send_cookie_ack(stcb);
2056                 if (how_indx < sizeof(asoc->cookie_how))
2057                         asoc->cookie_how[how_indx] = 15;
2058
2059                 return (stcb);
2060         }
2061         if (how_indx < sizeof(asoc->cookie_how))
2062                 asoc->cookie_how[how_indx] = 16;
2063         /* all other cases... */
2064         return (NULL);
2065 }
2066
2067
2068 /*
2069  * handle a state cookie for a new association m: input packet mbuf chain--
2070  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
2071  * and the cookie signature does not exist offset: offset into mbuf to the
2072  * cookie-echo chunk length: length of the cookie chunk to: where the init
2073  * was from returns a new TCB
2074  */
2075 static struct sctp_tcb *
2076 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
2077     struct sockaddr *src, struct sockaddr *dst,
2078     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
2079     struct sctp_inpcb *inp, struct sctp_nets **netp,
2080     struct sockaddr *init_src, int *notification,
2081     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2082     uint8_t mflowtype, uint32_t mflowid,
2083     uint32_t vrf_id, uint16_t port)
2084 {
2085         struct sctp_tcb *stcb;
2086         struct sctp_init_chunk *init_cp, init_buf;
2087         struct sctp_init_ack_chunk *initack_cp, initack_buf;
2088         union sctp_sockstore store;
2089         struct sctp_association *asoc;
2090         int init_offset, initack_offset, initack_limit;
2091         int retval;
2092         int error = 0;
2093         uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
2094 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2095         struct socket *so;
2096
2097         so = SCTP_INP_SO(inp);
2098 #endif
2099
2100         /*
2101          * find and validate the INIT chunk in the cookie (peer's info) the
2102          * INIT should start after the cookie-echo header struct (chunk
2103          * header, state cookie header struct)
2104          */
2105         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
2106         init_cp = (struct sctp_init_chunk *)
2107             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
2108             (uint8_t *)&init_buf);
2109         if (init_cp == NULL) {
2110                 /* could not pull a INIT chunk in cookie */
2111                 SCTPDBG(SCTP_DEBUG_INPUT1,
2112                     "process_cookie_new: could not pull INIT chunk hdr\n");
2113                 return (NULL);
2114         }
2115         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
2116                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
2117                 return (NULL);
2118         }
2119         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
2120         /*
2121          * find and validate the INIT-ACK chunk in the cookie (my info) the
2122          * INIT-ACK follows the INIT chunk
2123          */
2124         initack_cp = (struct sctp_init_ack_chunk *)
2125             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
2126             (uint8_t *)&initack_buf);
2127         if (initack_cp == NULL) {
2128                 /* could not pull INIT-ACK chunk in cookie */
2129                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2130                 return (NULL);
2131         }
2132         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2133                 return (NULL);
2134         }
2135         /*
2136          * NOTE: We can't use the INIT_ACK's chk_length to determine the
2137          * "initack_limit" value.  This is because the chk_length field
2138          * includes the length of the cookie, but the cookie is omitted when
2139          * the INIT and INIT_ACK are tacked onto the cookie...
2140          */
2141         initack_limit = offset + cookie_len;
2142
2143         /*
2144          * now that we know the INIT/INIT-ACK are in place, create a new TCB
2145          * and popluate
2146          */
2147
2148         /*
2149          * Here we do a trick, we set in NULL for the proc/thread argument.
2150          * We do this since in effect we only use the p argument when the
2151          * socket is unbound and we must do an implicit bind. Since we are
2152          * getting a cookie, we cannot be unbound.
2153          */
2154         stcb = sctp_aloc_assoc(inp, init_src, &error,
2155             ntohl(initack_cp->init.initiate_tag), vrf_id,
2156             ntohs(initack_cp->init.num_outbound_streams),
2157             port,
2158             (struct thread *)NULL
2159             );
2160         if (stcb == NULL) {
2161                 struct mbuf *op_err;
2162
2163                 /* memory problem? */
2164                 SCTPDBG(SCTP_DEBUG_INPUT1,
2165                     "process_cookie_new: no room for another TCB!\n");
2166                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2167                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2168                     src, dst, sh, op_err,
2169                     mflowtype, mflowid,
2170                     vrf_id, port);
2171                 return (NULL);
2172         }
2173         /* get the correct sctp_nets */
2174         if (netp)
2175                 *netp = sctp_findnet(stcb, init_src);
2176
2177         asoc = &stcb->asoc;
2178         /* get scope variables out of cookie */
2179         asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
2180         asoc->scope.site_scope = cookie->site_scope;
2181         asoc->scope.local_scope = cookie->local_scope;
2182         asoc->scope.loopback_scope = cookie->loopback_scope;
2183
2184         if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2185             (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2186                 struct mbuf *op_err;
2187
2188                 /*
2189                  * Houston we have a problem. The EP changed while the
2190                  * cookie was in flight. Only recourse is to abort the
2191                  * association.
2192                  */
2193                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2194                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2195                     src, dst, sh, op_err,
2196                     mflowtype, mflowid,
2197                     vrf_id, port);
2198 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2199                 atomic_add_int(&stcb->asoc.refcnt, 1);
2200                 SCTP_TCB_UNLOCK(stcb);
2201                 SCTP_SOCKET_LOCK(so, 1);
2202                 SCTP_TCB_LOCK(stcb);
2203                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2204 #endif
2205                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2206                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2207 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2208                 SCTP_SOCKET_UNLOCK(so, 1);
2209 #endif
2210                 return (NULL);
2211         }
2212         /* process the INIT-ACK info (my info) */
2213         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2214         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2215         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2216         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2217         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2218         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2219         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2220         asoc->str_reset_seq_in = asoc->init_seq_number;
2221
2222         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2223
2224         /* process the INIT info (peer's info) */
2225         if (netp)
2226                 retval = sctp_process_init(init_cp, stcb);
2227         else
2228                 retval = 0;
2229         if (retval < 0) {
2230 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2231                 atomic_add_int(&stcb->asoc.refcnt, 1);
2232                 SCTP_TCB_UNLOCK(stcb);
2233                 SCTP_SOCKET_LOCK(so, 1);
2234                 SCTP_TCB_LOCK(stcb);
2235                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2236 #endif
2237                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2238                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2239 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2240                 SCTP_SOCKET_UNLOCK(so, 1);
2241 #endif
2242                 return (NULL);
2243         }
2244         /* load all addresses */
2245         if (sctp_load_addresses_from_init(stcb, m,
2246             init_offset + sizeof(struct sctp_init_chunk), initack_offset,
2247             src, dst, init_src, port)) {
2248 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2249                 atomic_add_int(&stcb->asoc.refcnt, 1);
2250                 SCTP_TCB_UNLOCK(stcb);
2251                 SCTP_SOCKET_LOCK(so, 1);
2252                 SCTP_TCB_LOCK(stcb);
2253                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2254 #endif
2255                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2256                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2257 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2258                 SCTP_SOCKET_UNLOCK(so, 1);
2259 #endif
2260                 return (NULL);
2261         }
2262         /*
2263          * verify any preceding AUTH chunk that was skipped
2264          */
2265         /* pull the local authentication parameters from the cookie/init-ack */
2266         sctp_auth_get_cookie_params(stcb, m,
2267             initack_offset + sizeof(struct sctp_init_ack_chunk),
2268             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2269         if (auth_skipped) {
2270                 struct sctp_auth_chunk *auth;
2271
2272                 auth = (struct sctp_auth_chunk *)
2273                     sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2274                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2275                         /* auth HMAC failed, dump the assoc and packet */
2276                         SCTPDBG(SCTP_DEBUG_AUTH1,
2277                             "COOKIE-ECHO: AUTH failed\n");
2278 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2279                         atomic_add_int(&stcb->asoc.refcnt, 1);
2280                         SCTP_TCB_UNLOCK(stcb);
2281                         SCTP_SOCKET_LOCK(so, 1);
2282                         SCTP_TCB_LOCK(stcb);
2283                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2284 #endif
2285                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2286                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_21);
2287 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2288                         SCTP_SOCKET_UNLOCK(so, 1);
2289 #endif
2290                         return (NULL);
2291                 } else {
2292                         /* remaining chunks checked... good to go */
2293                         stcb->asoc.authenticated = 1;
2294                 }
2295         }
2296
2297         /*
2298          * if we're doing ASCONFs, check to see if we have any new local
2299          * addresses that need to get added to the peer (eg. addresses
2300          * changed while cookie echo in flight).  This needs to be done
2301          * after we go to the OPEN state to do the correct asconf
2302          * processing. else, make sure we have the correct addresses in our
2303          * lists
2304          */
2305
2306         /* warning, we re-use sin, sin6, sa_store here! */
2307         /* pull in local_address (our "from" address) */
2308         switch (cookie->laddr_type) {
2309 #ifdef INET
2310         case SCTP_IPV4_ADDRESS:
2311                 /* source addr is IPv4 */
2312                 memset(&store.sin, 0, sizeof(struct sockaddr_in));
2313                 store.sin.sin_family = AF_INET;
2314                 store.sin.sin_len = sizeof(struct sockaddr_in);
2315                 store.sin.sin_addr.s_addr = cookie->laddress[0];
2316                 break;
2317 #endif
2318 #ifdef INET6
2319         case SCTP_IPV6_ADDRESS:
2320                 /* source addr is IPv6 */
2321                 memset(&store.sin6, 0, sizeof(struct sockaddr_in6));
2322                 store.sin6.sin6_family = AF_INET6;
2323                 store.sin6.sin6_len = sizeof(struct sockaddr_in6);
2324                 store.sin6.sin6_scope_id = cookie->scope_id;
2325                 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr));
2326                 break;
2327 #endif
2328         default:
2329 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2330                 atomic_add_int(&stcb->asoc.refcnt, 1);
2331                 SCTP_TCB_UNLOCK(stcb);
2332                 SCTP_SOCKET_LOCK(so, 1);
2333                 SCTP_TCB_LOCK(stcb);
2334                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2335 #endif
2336                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2337                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
2338 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2339                 SCTP_SOCKET_UNLOCK(so, 1);
2340 #endif
2341                 return (NULL);
2342         }
2343
2344         /* update current state */
2345         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2346         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
2347         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2348                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2349                     stcb->sctp_ep, stcb, asoc->primary_destination);
2350         }
2351         sctp_stop_all_cookie_timers(stcb);
2352         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2353         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2354
2355         /* set up to notify upper layer */
2356         *notification = SCTP_NOTIFY_ASSOC_UP;
2357         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2358             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2359             (!SCTP_IS_LISTENING(inp))) {
2360                 /*
2361                  * This is an endpoint that called connect() how it got a
2362                  * cookie that is NEW is a bit of a mystery. It must be that
2363                  * the INIT was sent, but before it got there.. a complete
2364                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2365                  * should have went to the other code.. not here.. oh well..
2366                  * a bit of protection is worth having..
2367                  */
2368                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2369 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2370                 atomic_add_int(&stcb->asoc.refcnt, 1);
2371                 SCTP_TCB_UNLOCK(stcb);
2372                 SCTP_SOCKET_LOCK(so, 1);
2373                 SCTP_TCB_LOCK(stcb);
2374                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2375                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2376                         SCTP_SOCKET_UNLOCK(so, 1);
2377                         return (NULL);
2378                 }
2379 #endif
2380                 soisconnected(stcb->sctp_socket);
2381 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2382                 SCTP_SOCKET_UNLOCK(so, 1);
2383 #endif
2384         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2385             (SCTP_IS_LISTENING(inp))) {
2386                 /*
2387                  * We don't want to do anything with this one. Since it is
2388                  * the listening guy. The timer will get started for
2389                  * accepted connections in the caller.
2390                  */
2391                 ;
2392         }
2393         /* since we did not send a HB make sure we don't double things */
2394         if ((netp) && (*netp))
2395                 (*netp)->hb_responded = 1;
2396
2397         if (stcb->asoc.sctp_autoclose_ticks &&
2398             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2399                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2400         }
2401         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2402         if ((netp != NULL) && (*netp != NULL)) {
2403                 struct timeval old;
2404
2405                 /* calculate the RTT and set the encaps port */
2406                 old.tv_sec = cookie->time_entered.tv_sec;
2407                 old.tv_usec = cookie->time_entered.tv_usec;
2408                 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
2409                     &old, SCTP_RTT_FROM_NON_DATA);
2410         }
2411         /* respond with a COOKIE-ACK */
2412         sctp_send_cookie_ack(stcb);
2413
2414         /*
2415          * check the address lists for any ASCONFs that need to be sent
2416          * AFTER the cookie-ack is sent
2417          */
2418         sctp_check_address_list(stcb, m,
2419             initack_offset + sizeof(struct sctp_init_ack_chunk),
2420             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2421             &store.sa, cookie->local_scope, cookie->site_scope,
2422             cookie->ipv4_scope, cookie->loopback_scope);
2423
2424
2425         return (stcb);
2426 }
2427
2428 /*
2429  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2430  * we NEED to make sure we are not already using the vtag. If so we
2431  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2432         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2433                                                             SCTP_BASE_INFO(hashasocmark))];
2434         LIST_FOREACH(stcb, head, sctp_asocs) {
2435                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2436                        -- SEND ABORT - TRY AGAIN --
2437                 }
2438         }
2439 */
2440
2441 /*
2442  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2443  * existing (non-NULL) TCB
2444  */
2445 static struct mbuf *
2446 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2447     struct sockaddr *src, struct sockaddr *dst,
2448     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2449     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2450     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2451     struct sctp_tcb **locked_tcb,
2452     uint8_t mflowtype, uint32_t mflowid,
2453     uint32_t vrf_id, uint16_t port)
2454 {
2455         struct sctp_state_cookie *cookie;
2456         struct sctp_tcb *l_stcb = *stcb;
2457         struct sctp_inpcb *l_inp;
2458         struct sockaddr *to;
2459         struct sctp_pcb *ep;
2460         struct mbuf *m_sig;
2461         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2462         uint8_t *sig;
2463         uint8_t cookie_ok = 0;
2464         unsigned int sig_offset, cookie_offset;
2465         unsigned int cookie_len;
2466         struct timeval now;
2467         struct timeval time_expires;
2468         int notification = 0;
2469         struct sctp_nets *netl;
2470         int had_a_existing_tcb = 0;
2471         int send_int_conf = 0;
2472 #ifdef INET
2473         struct sockaddr_in sin;
2474 #endif
2475 #ifdef INET6
2476         struct sockaddr_in6 sin6;
2477 #endif
2478
2479         SCTPDBG(SCTP_DEBUG_INPUT2,
2480             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2481
2482         if (inp_p == NULL) {
2483                 return (NULL);
2484         }
2485         cookie = &cp->cookie;
2486         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2487         cookie_len = ntohs(cp->ch.chunk_length);
2488
2489         if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2490             sizeof(struct sctp_init_chunk) +
2491             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2492                 /* cookie too small */
2493                 return (NULL);
2494         }
2495         if ((cookie->peerport != sh->src_port) ||
2496             (cookie->myport != sh->dest_port) ||
2497             (cookie->my_vtag != sh->v_tag)) {
2498                 /*
2499                  * invalid ports or bad tag.  Note that we always leave the
2500                  * v_tag in the header in network order and when we stored
2501                  * it in the my_vtag slot we also left it in network order.
2502                  * This maintains the match even though it may be in the
2503                  * opposite byte order of the machine :->
2504                  */
2505                 return (NULL);
2506         }
2507         /*
2508          * split off the signature into its own mbuf (since it should not be
2509          * calculated in the sctp_hmac_m() call).
2510          */
2511         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2512         m_sig = m_split(m, sig_offset, M_NOWAIT);
2513         if (m_sig == NULL) {
2514                 /* out of memory or ?? */
2515                 return (NULL);
2516         }
2517 #ifdef SCTP_MBUF_LOGGING
2518         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2519                 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT);
2520         }
2521 #endif
2522
2523         /*
2524          * compute the signature/digest for the cookie
2525          */
2526         ep = &(*inp_p)->sctp_ep;
2527         l_inp = *inp_p;
2528         if (l_stcb) {
2529                 SCTP_TCB_UNLOCK(l_stcb);
2530         }
2531         SCTP_INP_RLOCK(l_inp);
2532         if (l_stcb) {
2533                 SCTP_TCB_LOCK(l_stcb);
2534         }
2535         /* which cookie is it? */
2536         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2537             (ep->current_secret_number != ep->last_secret_number)) {
2538                 /* it's the old cookie */
2539                 (void)sctp_hmac_m(SCTP_HMAC,
2540                     (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2541                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2542         } else {
2543                 /* it's the current cookie */
2544                 (void)sctp_hmac_m(SCTP_HMAC,
2545                     (uint8_t *)ep->secret_key[(int)ep->current_secret_number],
2546                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2547         }
2548         /* get the signature */
2549         SCTP_INP_RUNLOCK(l_inp);
2550         sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig);
2551         if (sig == NULL) {
2552                 /* couldn't find signature */
2553                 sctp_m_freem(m_sig);
2554                 return (NULL);
2555         }
2556         /* compare the received digest with the computed digest */
2557         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2558                 /* try the old cookie? */
2559                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2560                     (ep->current_secret_number != ep->last_secret_number)) {
2561                         /* compute digest with old */
2562                         (void)sctp_hmac_m(SCTP_HMAC,
2563                             (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2564                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2565                         /* compare */
2566                         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2567                                 cookie_ok = 1;
2568                 }
2569         } else {
2570                 cookie_ok = 1;
2571         }
2572
2573         /*
2574          * Now before we continue we must reconstruct our mbuf so that
2575          * normal processing of any other chunks will work.
2576          */
2577         {
2578                 struct mbuf *m_at;
2579
2580                 m_at = m;
2581                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2582                         m_at = SCTP_BUF_NEXT(m_at);
2583                 }
2584                 SCTP_BUF_NEXT(m_at) = m_sig;
2585         }
2586
2587         if (cookie_ok == 0) {
2588                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2589                 SCTPDBG(SCTP_DEBUG_INPUT2,
2590                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2591                     (uint32_t)offset, cookie_offset, sig_offset);
2592                 return (NULL);
2593         }
2594
2595         /*
2596          * check the cookie timestamps to be sure it's not stale
2597          */
2598         (void)SCTP_GETTIME_TIMEVAL(&now);
2599         /* Expire time is in Ticks, so we convert to seconds */
2600         time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
2601         time_expires.tv_usec = cookie->time_entered.tv_usec;
2602         if (timevalcmp(&now, &time_expires, >)) {
2603                 /* cookie is stale! */
2604                 struct mbuf *op_err;
2605                 struct sctp_error_stale_cookie *cause;
2606                 struct timeval diff;
2607                 uint32_t staleness;
2608
2609                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie),
2610                     0, M_NOWAIT, 1, MT_DATA);
2611                 if (op_err == NULL) {
2612                         /* FOOBAR */
2613                         return (NULL);
2614                 }
2615                 /* Set the len */
2616                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie);
2617                 cause = mtod(op_err, struct sctp_error_stale_cookie *);
2618                 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE);
2619                 cause->cause.length = htons((sizeof(struct sctp_paramhdr) +
2620                     (sizeof(uint32_t))));
2621                 diff = now;
2622                 timevalsub(&diff, &time_expires);
2623                 if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) {
2624                         staleness = UINT32_MAX;
2625                 } else {
2626                         staleness = diff.tv_sec * 1000000;
2627                 }
2628                 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) {
2629                         staleness += diff.tv_usec;
2630                 } else {
2631                         staleness = UINT32_MAX;
2632                 }
2633                 cause->stale_time = htonl(staleness);
2634                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
2635                     mflowtype, mflowid, l_inp->fibnum,
2636                     vrf_id, port);
2637                 return (NULL);
2638         }
2639         /*
2640          * Now we must see with the lookup address if we have an existing
2641          * asoc. This will only happen if we were in the COOKIE-WAIT state
2642          * and a INIT collided with us and somewhere the peer sent the
2643          * cookie on another address besides the single address our assoc
2644          * had for him. In this case we will have one of the tie-tags set at
2645          * least AND the address field in the cookie can be used to look it
2646          * up.
2647          */
2648         to = NULL;
2649         switch (cookie->addr_type) {
2650 #ifdef INET6
2651         case SCTP_IPV6_ADDRESS:
2652                 memset(&sin6, 0, sizeof(sin6));
2653                 sin6.sin6_family = AF_INET6;
2654                 sin6.sin6_len = sizeof(sin6);
2655                 sin6.sin6_port = sh->src_port;
2656                 sin6.sin6_scope_id = cookie->scope_id;
2657                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2658                     sizeof(sin6.sin6_addr.s6_addr));
2659                 to = (struct sockaddr *)&sin6;
2660                 break;
2661 #endif
2662 #ifdef INET
2663         case SCTP_IPV4_ADDRESS:
2664                 memset(&sin, 0, sizeof(sin));
2665                 sin.sin_family = AF_INET;
2666                 sin.sin_len = sizeof(sin);
2667                 sin.sin_port = sh->src_port;
2668                 sin.sin_addr.s_addr = cookie->address[0];
2669                 to = (struct sockaddr *)&sin;
2670                 break;
2671 #endif
2672         default:
2673                 /* This should not happen */
2674                 return (NULL);
2675         }
2676         if (*stcb == NULL) {
2677                 /* Yep, lets check */
2678                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
2679                 if (*stcb == NULL) {
2680                         /*
2681                          * We should have only got back the same inp. If we
2682                          * got back a different ep we have a problem. The
2683                          * original findep got back l_inp and now
2684                          */
2685                         if (l_inp != *inp_p) {
2686                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2687                         }
2688                 } else {
2689                         if (*locked_tcb == NULL) {
2690                                 /*
2691                                  * In this case we found the assoc only
2692                                  * after we locked the create lock. This
2693                                  * means we are in a colliding case and we
2694                                  * must make sure that we unlock the tcb if
2695                                  * its one of the cases where we throw away
2696                                  * the incoming packets.
2697                                  */
2698                                 *locked_tcb = *stcb;
2699
2700                                 /*
2701                                  * We must also increment the inp ref count
2702                                  * since the ref_count flags was set when we
2703                                  * did not find the TCB, now we found it
2704                                  * which reduces the refcount.. we must
2705                                  * raise it back out to balance it all :-)
2706                                  */
2707                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2708                                 if ((*stcb)->sctp_ep != l_inp) {
2709                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2710                                             (void *)(*stcb)->sctp_ep, (void *)l_inp);
2711                                 }
2712                         }
2713                 }
2714         }
2715
2716         cookie_len -= SCTP_SIGNATURE_SIZE;
2717         if (*stcb == NULL) {
2718                 /* this is the "normal" case... get a new TCB */
2719                 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
2720                     cookie, cookie_len, *inp_p,
2721                     netp, to, &notification,
2722                     auth_skipped, auth_offset, auth_len,
2723                     mflowtype, mflowid,
2724                     vrf_id, port);
2725         } else {
2726                 /* this is abnormal... cookie-echo on existing TCB */
2727                 had_a_existing_tcb = 1;
2728                 *stcb = sctp_process_cookie_existing(m, iphlen, offset,
2729                     src, dst, sh,
2730                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2731                     &notification, auth_skipped, auth_offset, auth_len,
2732                     mflowtype, mflowid,
2733                     vrf_id, port);
2734         }
2735
2736         if (*stcb == NULL) {
2737                 /* still no TCB... must be bad cookie-echo */
2738                 return (NULL);
2739         }
2740         if (*netp != NULL) {
2741                 (*netp)->flowtype = mflowtype;
2742                 (*netp)->flowid = mflowid;
2743         }
2744         /*
2745          * Ok, we built an association so confirm the address we sent the
2746          * INIT-ACK to.
2747          */
2748         netl = sctp_findnet(*stcb, to);
2749         /*
2750          * This code should in theory NOT run but
2751          */
2752         if (netl == NULL) {
2753                 /* TSNH! Huh, why do I need to add this address here? */
2754                 if (sctp_add_remote_addr(*stcb, to, NULL, port,
2755                     SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2756                         return (NULL);
2757                 }
2758                 netl = sctp_findnet(*stcb, to);
2759         }
2760         if (netl) {
2761                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2762                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2763                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2764                             netl);
2765                         send_int_conf = 1;
2766                 }
2767         }
2768         sctp_start_net_timers(*stcb);
2769         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2770                 if (!had_a_existing_tcb ||
2771                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2772                         /*
2773                          * If we have a NEW cookie or the connect never
2774                          * reached the connected state during collision we
2775                          * must do the TCP accept thing.
2776                          */
2777                         struct socket *so, *oso;
2778                         struct sctp_inpcb *inp;
2779
2780                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2781                                 /*
2782                                  * For a restart we will keep the same
2783                                  * socket, no need to do anything. I THINK!!
2784                                  */
2785                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2786                                 if (send_int_conf) {
2787                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2788                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2789                                 }
2790                                 return (m);
2791                         }
2792                         oso = (*inp_p)->sctp_socket;
2793                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2794                         SCTP_TCB_UNLOCK((*stcb));
2795                         CURVNET_SET(oso->so_vnet);
2796                         so = sonewconn(oso, 0
2797                             );
2798                         CURVNET_RESTORE();
2799                         SCTP_TCB_LOCK((*stcb));
2800                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2801
2802                         if (so == NULL) {
2803                                 struct mbuf *op_err;
2804 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2805                                 struct socket *pcb_so;
2806 #endif
2807                                 /* Too many sockets */
2808                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2809                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2810                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2811                                     src, dst, sh, op_err,
2812                                     mflowtype, mflowid,
2813                                     vrf_id, port);
2814 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2815                                 pcb_so = SCTP_INP_SO(*inp_p);
2816                                 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2817                                 SCTP_TCB_UNLOCK((*stcb));
2818                                 SCTP_SOCKET_LOCK(pcb_so, 1);
2819                                 SCTP_TCB_LOCK((*stcb));
2820                                 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2821 #endif
2822                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC,
2823                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
2824 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2825                                 SCTP_SOCKET_UNLOCK(pcb_so, 1);
2826 #endif
2827                                 return (NULL);
2828                         }
2829                         inp = (struct sctp_inpcb *)so->so_pcb;
2830                         SCTP_INP_INCR_REF(inp);
2831                         /*
2832                          * We add the unbound flag here so that if we get an
2833                          * soabort() before we get the move_pcb done, we
2834                          * will properly cleanup.
2835                          */
2836                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2837                             SCTP_PCB_FLAGS_CONNECTED |
2838                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2839                             SCTP_PCB_FLAGS_UNBOUND |
2840                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2841                             SCTP_PCB_FLAGS_DONT_WAKE);
2842                         inp->sctp_features = (*inp_p)->sctp_features;
2843                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2844                         inp->sctp_socket = so;
2845                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2846                         inp->max_cwnd = (*inp_p)->max_cwnd;
2847                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2848                         inp->ecn_supported = (*inp_p)->ecn_supported;
2849                         inp->prsctp_supported = (*inp_p)->prsctp_supported;
2850                         inp->auth_supported = (*inp_p)->auth_supported;
2851                         inp->asconf_supported = (*inp_p)->asconf_supported;
2852                         inp->reconfig_supported = (*inp_p)->reconfig_supported;
2853                         inp->nrsack_supported = (*inp_p)->nrsack_supported;
2854                         inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
2855                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2856                         inp->sctp_context = (*inp_p)->sctp_context;
2857                         inp->local_strreset_support = (*inp_p)->local_strreset_support;
2858                         inp->fibnum = (*inp_p)->fibnum;
2859                         inp->inp_starting_point_for_iterator = NULL;
2860                         /*
2861                          * copy in the authentication parameters from the
2862                          * original endpoint
2863                          */
2864                         if (inp->sctp_ep.local_hmacs)
2865                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2866                         inp->sctp_ep.local_hmacs =
2867                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2868                         if (inp->sctp_ep.local_auth_chunks)
2869                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2870                         inp->sctp_ep.local_auth_chunks =
2871                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2872
2873                         /*
2874                          * Now we must move it from one hash table to
2875                          * another and get the tcb in the right place.
2876                          */
2877
2878                         /*
2879                          * This is where the one-2-one socket is put into
2880                          * the accept state waiting for the accept!
2881                          */
2882                         if (*stcb) {
2883                                 SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE);
2884                         }
2885                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2886
2887                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2888                         SCTP_TCB_UNLOCK((*stcb));
2889
2890                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2891                             0);
2892                         SCTP_TCB_LOCK((*stcb));
2893                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2894
2895
2896                         /*
2897                          * now we must check to see if we were aborted while
2898                          * the move was going on and the lock/unlock
2899                          * happened.
2900                          */
2901                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2902                                 /*
2903                                  * yep it was, we leave the assoc attached
2904                                  * to the socket since the sctp_inpcb_free()
2905                                  * call will send an abort for us.
2906                                  */
2907                                 SCTP_INP_DECR_REF(inp);
2908                                 return (NULL);
2909                         }
2910                         SCTP_INP_DECR_REF(inp);
2911                         /* Switch over to the new guy */
2912                         *inp_p = inp;
2913                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2914                         if (send_int_conf) {
2915                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2916                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2917                         }
2918
2919                         /*
2920                          * Pull it from the incomplete queue and wake the
2921                          * guy
2922                          */
2923 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2924                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2925                         SCTP_TCB_UNLOCK((*stcb));
2926                         SCTP_SOCKET_LOCK(so, 1);
2927 #endif
2928                         soisconnected(so);
2929 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2930                         SCTP_TCB_LOCK((*stcb));
2931                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2932                         SCTP_SOCKET_UNLOCK(so, 1);
2933 #endif
2934                         return (m);
2935                 }
2936         }
2937         if (notification) {
2938                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2939         }
2940         if (send_int_conf) {
2941                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2942                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2943         }
2944         return (m);
2945 }
2946
2947 static void
2948 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2949     struct sctp_tcb *stcb, struct sctp_nets *net)
2950 {
2951         /* cp must not be used, others call this without a c-ack :-) */
2952         struct sctp_association *asoc;
2953
2954         SCTPDBG(SCTP_DEBUG_INPUT2,
2955             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2956         if ((stcb == NULL) || (net == NULL)) {
2957                 return;
2958         }
2959
2960         asoc = &stcb->asoc;
2961         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
2962                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
2963                     asoc->overall_error_count,
2964                     0,
2965                     SCTP_FROM_SCTP_INPUT,
2966                     __LINE__);
2967         }
2968         asoc->overall_error_count = 0;
2969         sctp_stop_all_cookie_timers(stcb);
2970         /* process according to association state */
2971         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) {
2972                 /* state change only needed when I am in right state */
2973                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2974                 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
2975                 sctp_start_net_timers(stcb);
2976                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2977                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2978                             stcb->sctp_ep, stcb, asoc->primary_destination);
2979
2980                 }
2981                 /* update RTO */
2982                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2983                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2984                 if (asoc->overall_error_count == 0) {
2985                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
2986                             &asoc->time_entered,
2987                             SCTP_RTT_FROM_NON_DATA);
2988                 }
2989                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2990                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2991                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2992                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2993 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2994                         struct socket *so;
2995
2996 #endif
2997                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2998 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2999                         so = SCTP_INP_SO(stcb->sctp_ep);
3000                         atomic_add_int(&stcb->asoc.refcnt, 1);
3001                         SCTP_TCB_UNLOCK(stcb);
3002                         SCTP_SOCKET_LOCK(so, 1);
3003                         SCTP_TCB_LOCK(stcb);
3004                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3005 #endif
3006                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
3007                                 soisconnected(stcb->sctp_socket);
3008                         }
3009 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3010                         SCTP_SOCKET_UNLOCK(so, 1);
3011 #endif
3012                 }
3013                 /*
3014                  * since we did not send a HB make sure we don't double
3015                  * things
3016                  */
3017                 net->hb_responded = 1;
3018
3019                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
3020                         /*
3021                          * We don't need to do the asconf thing, nor hb or
3022                          * autoclose if the socket is closed.
3023                          */
3024                         goto closed_socket;
3025                 }
3026
3027                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
3028                     stcb, net);
3029
3030
3031                 if (stcb->asoc.sctp_autoclose_ticks &&
3032                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
3033                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
3034                             stcb->sctp_ep, stcb, NULL);
3035                 }
3036                 /*
3037                  * send ASCONF if parameters are pending and ASCONFs are
3038                  * allowed (eg. addresses changed when init/cookie echo were
3039                  * in flight)
3040                  */
3041                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
3042                     (stcb->asoc.asconf_supported == 1) &&
3043                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
3044 #ifdef SCTP_TIMER_BASED_ASCONF
3045                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
3046                             stcb->sctp_ep, stcb,
3047                             stcb->asoc.primary_destination);
3048 #else
3049                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
3050                             SCTP_ADDR_NOT_LOCKED);
3051 #endif
3052                 }
3053         }
3054 closed_socket:
3055         /* Toss the cookie if I can */
3056         sctp_toss_old_cookies(stcb, asoc);
3057         if (!TAILQ_EMPTY(&asoc->sent_queue)) {
3058                 /* Restart the timer if we have pending data */
3059                 struct sctp_tmit_chunk *chk;
3060
3061                 chk = TAILQ_FIRST(&asoc->sent_queue);
3062                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
3063         }
3064 }
3065
3066 static void
3067 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
3068     struct sctp_tcb *stcb)
3069 {
3070         struct sctp_nets *net;
3071         struct sctp_tmit_chunk *lchk;
3072         struct sctp_ecne_chunk bkup;
3073         uint8_t override_bit;
3074         uint32_t tsn, window_data_tsn;
3075         int len;
3076         unsigned int pkt_cnt;
3077
3078         len = ntohs(cp->ch.chunk_length);
3079         if ((len != sizeof(struct sctp_ecne_chunk)) &&
3080             (len != sizeof(struct old_sctp_ecne_chunk))) {
3081                 return;
3082         }
3083         if (len == sizeof(struct old_sctp_ecne_chunk)) {
3084                 /* Its the old format */
3085                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
3086                 bkup.num_pkts_since_cwr = htonl(1);
3087                 cp = &bkup;
3088         }
3089         SCTP_STAT_INCR(sctps_recvecne);
3090         tsn = ntohl(cp->tsn);
3091         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
3092         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
3093         if (lchk == NULL) {
3094                 window_data_tsn = stcb->asoc.sending_seq - 1;
3095         } else {
3096                 window_data_tsn = lchk->rec.data.tsn;
3097         }
3098
3099         /* Find where it was sent to if possible. */
3100         net = NULL;
3101         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
3102                 if (lchk->rec.data.tsn == tsn) {
3103                         net = lchk->whoTo;
3104                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
3105                         break;
3106                 }
3107                 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) {
3108                         break;
3109                 }
3110         }
3111         if (net == NULL) {
3112                 /*
3113                  * What to do. A previous send of a CWR was possibly lost.
3114                  * See how old it is, we may have it marked on the actual
3115                  * net.
3116                  */
3117                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
3118                         if (tsn == net->last_cwr_tsn) {
3119                                 /* Found him, send it off */
3120                                 break;
3121                         }
3122                 }
3123                 if (net == NULL) {
3124                         /*
3125                          * If we reach here, we need to send a special CWR
3126                          * that says hey, we did this a long time ago and
3127                          * you lost the response.
3128                          */
3129                         net = TAILQ_FIRST(&stcb->asoc.nets);
3130                         if (net == NULL) {
3131                                 /* TSNH */
3132                                 return;
3133                         }
3134                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
3135                 } else {
3136                         override_bit = 0;
3137                 }
3138         } else {
3139                 override_bit = 0;
3140         }
3141         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
3142             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3143                 /*
3144                  * JRS - Use the congestion control given in the pluggable
3145                  * CC module
3146                  */
3147                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
3148                 /*
3149                  * We reduce once every RTT. So we will only lower cwnd at
3150                  * the next sending seq i.e. the window_data_tsn
3151                  */
3152                 net->cwr_window_tsn = window_data_tsn;
3153                 net->ecn_ce_pkt_cnt += pkt_cnt;
3154                 net->lost_cnt = pkt_cnt;
3155                 net->last_cwr_tsn = tsn;
3156         } else {
3157                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
3158                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
3159                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3160                         /*
3161                          * Another loss in the same window update how many
3162                          * marks/packets lost we have had.
3163                          */
3164                         int cnt = 1;
3165
3166                         if (pkt_cnt > net->lost_cnt) {
3167                                 /* Should be the case */
3168                                 cnt = (pkt_cnt - net->lost_cnt);
3169                                 net->ecn_ce_pkt_cnt += cnt;
3170                         }
3171                         net->lost_cnt = pkt_cnt;
3172                         net->last_cwr_tsn = tsn;
3173                         /*
3174                          * Most CC functions will ignore this call, since we
3175                          * are in-window yet of the initial CE the peer saw.
3176                          */
3177                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
3178                 }
3179         }
3180         /*
3181          * We always send a CWR this way if our previous one was lost our
3182          * peer will get an update, or if it is not time again to reduce we
3183          * still get the cwr to the peer. Note we set the override when we
3184          * could not find the TSN on the chunk or the destination network.
3185          */
3186         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
3187 }
3188
3189 static void
3190 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3191 {
3192         /*
3193          * Here we get a CWR from the peer. We must look in the outqueue and
3194          * make sure that we have a covered ECNE in the control chunk part.
3195          * If so remove it.
3196          */
3197         struct sctp_tmit_chunk *chk, *nchk;
3198         struct sctp_ecne_chunk *ecne;
3199         int override;
3200         uint32_t cwr_tsn;
3201
3202         cwr_tsn = ntohl(cp->tsn);
3203         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3204         TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) {
3205                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3206                         continue;
3207                 }
3208                 if ((override == 0) && (chk->whoTo != net)) {
3209                         /* Must be from the right src unless override is set */
3210                         continue;
3211                 }
3212                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3213                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3214                         /* this covers this ECNE, we can remove it */
3215                         stcb->asoc.ecn_echo_cnt_onq--;
3216                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3217                             sctp_next);
3218                         stcb->asoc.ctrl_queue_cnt--;
3219                         sctp_m_freem(chk->data);
3220                         chk->data = NULL;
3221                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3222                         if (override == 0) {
3223                                 break;
3224                         }
3225                 }
3226         }
3227 }
3228
3229 static void
3230 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3231     struct sctp_tcb *stcb, struct sctp_nets *net)
3232 {
3233 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3234         struct socket *so;
3235 #endif
3236
3237         SCTPDBG(SCTP_DEBUG_INPUT2,
3238             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3239         if (stcb == NULL)
3240                 return;
3241
3242         /* process according to association state */
3243         if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3244                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3245                 SCTPDBG(SCTP_DEBUG_INPUT2,
3246                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3247                 SCTP_TCB_UNLOCK(stcb);
3248                 return;
3249         }
3250         /* notify upper layer protocol */
3251         if (stcb->sctp_socket) {
3252                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3253         }
3254 #ifdef INVARIANTS
3255         if (!TAILQ_EMPTY(&stcb->asoc.send_queue) ||
3256             !TAILQ_EMPTY(&stcb->asoc.sent_queue) ||
3257             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
3258                 panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
3259         }
3260 #endif
3261         /* stop the timer */
3262         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net,
3263             SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3264         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3265         /* free the TCB */
3266         SCTPDBG(SCTP_DEBUG_INPUT2,
3267             "sctp_handle_shutdown_complete: calls free-asoc\n");
3268 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3269         so = SCTP_INP_SO(stcb->sctp_ep);
3270         atomic_add_int(&stcb->asoc.refcnt, 1);
3271         SCTP_TCB_UNLOCK(stcb);
3272         SCTP_SOCKET_LOCK(so, 1);
3273         SCTP_TCB_LOCK(stcb);
3274         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3275 #endif
3276         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
3277             SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3278 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3279         SCTP_SOCKET_UNLOCK(so, 1);
3280 #endif
3281         return;
3282 }
3283
3284 static int
3285 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3286     struct sctp_nets *net, uint8_t flg)
3287 {
3288         switch (desc->chunk_type) {
3289         case SCTP_DATA:
3290                 /* find the tsn to resend (possibly */
3291                 {
3292                         uint32_t tsn;
3293                         struct sctp_tmit_chunk *tp1;
3294
3295                         tsn = ntohl(desc->tsn_ifany);
3296                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3297                                 if (tp1->rec.data.tsn == tsn) {
3298                                         /* found it */
3299                                         break;
3300                                 }
3301                                 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) {
3302                                         /* not found */
3303                                         tp1 = NULL;
3304                                         break;
3305                                 }
3306                         }
3307                         if (tp1 == NULL) {
3308                                 /*
3309                                  * Do it the other way , aka without paying
3310                                  * attention to queue seq order.
3311                                  */
3312                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3313                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3314                                         if (tp1->rec.data.tsn == tsn) {
3315                                                 /* found it */
3316                                                 break;
3317                                         }
3318                                 }
3319                         }
3320                         if (tp1 == NULL) {
3321                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3322                         }
3323                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3324                                 uint8_t *ddp;
3325
3326                                 if (((flg & SCTP_BADCRC) == 0) &&
3327                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3328                                         return (0);
3329                                 }
3330                                 if ((stcb->asoc.peers_rwnd == 0) &&
3331                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3332                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3333                                         return (0);
3334                                 }
3335                                 if (stcb->asoc.peers_rwnd == 0 &&
3336                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3337                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3338                                         return (0);
3339                                 }
3340                                 ddp = (uint8_t *)(mtod(tp1->data, caddr_t)+
3341                                     sizeof(struct sctp_data_chunk));
3342                                 {
3343                                         unsigned int iii;
3344
3345                                         for (iii = 0; iii < sizeof(desc->data_bytes);
3346                                             iii++) {
3347                                                 if (ddp[iii] != desc->data_bytes[iii]) {
3348                                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3349                                                         return (-1);
3350                                                 }
3351                                         }
3352                                 }
3353
3354                                 if (tp1->do_rtt) {
3355                                         /*
3356                                          * this guy had a RTO calculation
3357                                          * pending on it, cancel it
3358                                          */
3359                                         if (tp1->whoTo->rto_needed == 0) {
3360                                                 tp1->whoTo->rto_needed = 1;
3361                                         }
3362                                         tp1->do_rtt = 0;
3363                                 }
3364                                 SCTP_STAT_INCR(sctps_pdrpmark);
3365                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3366                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3367                                 /*
3368                                  * mark it as if we were doing a FR, since
3369                                  * we will be getting gap ack reports behind
3370                                  * the info from the router.
3371                                  */
3372                                 tp1->rec.data.doing_fast_retransmit = 1;
3373                                 /*
3374                                  * mark the tsn with what sequences can
3375                                  * cause a new FR.
3376                                  */
3377                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3378                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3379                                 } else {
3380                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn;
3381                                 }
3382
3383                                 /* restart the timer */
3384                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3385                                     stcb, tp1->whoTo,
3386                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3387                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3388                                     stcb, tp1->whoTo);
3389
3390                                 /* fix counts and things */
3391                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3392                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3393                                             tp1->whoTo->flight_size,
3394                                             tp1->book_size,
3395                                             (uint32_t)(uintptr_t)stcb,
3396                                             tp1->rec.data.tsn);
3397                                 }
3398                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3399                                         sctp_flight_size_decrease(tp1);
3400                                         sctp_total_flight_decrease(stcb, tp1);
3401                                 }
3402                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3403                         } {
3404                                 /* audit code */
3405                                 unsigned int audit;
3406
3407                                 audit = 0;
3408                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3409                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3410                                                 audit++;
3411                                 }
3412                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3413                                     sctp_next) {
3414                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3415                                                 audit++;
3416                                 }
3417                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3418                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3419                                             audit, stcb->asoc.sent_queue_retran_cnt);
3420 #ifndef SCTP_AUDITING_ENABLED
3421                                         stcb->asoc.sent_queue_retran_cnt = audit;
3422 #endif
3423                                 }
3424                         }
3425                 }
3426                 break;
3427         case SCTP_ASCONF:
3428                 {
3429                         struct sctp_tmit_chunk *asconf;
3430
3431                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3432                             sctp_next) {
3433                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3434                                         break;
3435                                 }
3436                         }
3437                         if (asconf) {
3438                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3439                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3440                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3441                                 asconf->snd_count--;
3442                         }
3443                 }
3444                 break;
3445         case SCTP_INITIATION:
3446                 /* resend the INIT */
3447                 stcb->asoc.dropped_special_cnt++;
3448                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3449                         /*
3450                          * If we can get it in, in a few attempts we do
3451                          * this, otherwise we let the timer fire.
3452                          */
3453                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3454                             stcb, net,
3455                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
3456                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3457                 }
3458                 break;
3459         case SCTP_SELECTIVE_ACK:
3460         case SCTP_NR_SELECTIVE_ACK:
3461                 /* resend the sack */
3462                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3463                 break;
3464         case SCTP_HEARTBEAT_REQUEST:
3465                 /* resend a demand HB */
3466                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3467                         /*
3468                          * Only retransmit if we KNOW we wont destroy the
3469                          * tcb
3470                          */
3471                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3472                 }
3473                 break;
3474         case SCTP_SHUTDOWN:
3475                 sctp_send_shutdown(stcb, net);
3476                 break;
3477         case SCTP_SHUTDOWN_ACK:
3478                 sctp_send_shutdown_ack(stcb, net);
3479                 break;
3480         case SCTP_COOKIE_ECHO:
3481                 {
3482                         struct sctp_tmit_chunk *cookie;
3483
3484                         cookie = NULL;
3485                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3486                             sctp_next) {
3487                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3488                                         break;
3489                                 }
3490                         }
3491                         if (cookie) {
3492                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3493                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3494                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3495                                 sctp_stop_all_cookie_timers(stcb);
3496                         }
3497                 }
3498                 break;
3499         case SCTP_COOKIE_ACK:
3500                 sctp_send_cookie_ack(stcb);
3501                 break;
3502         case SCTP_ASCONF_ACK:
3503                 /* resend last asconf ack */
3504                 sctp_send_asconf_ack(stcb);
3505                 break;
3506         case SCTP_IFORWARD_CUM_TSN:
3507         case SCTP_FORWARD_CUM_TSN:
3508                 send_forward_tsn(stcb, &stcb->asoc);
3509                 break;
3510                 /* can't do anything with these */
3511         case SCTP_PACKET_DROPPED:
3512         case SCTP_INITIATION_ACK:       /* this should not happen */
3513         case SCTP_HEARTBEAT_ACK:
3514         case SCTP_ABORT_ASSOCIATION:
3515         case SCTP_OPERATION_ERROR:
3516         case SCTP_SHUTDOWN_COMPLETE:
3517         case SCTP_ECN_ECHO:
3518         case SCTP_ECN_CWR:
3519         default:
3520                 break;
3521         }
3522         return (0);
3523 }
3524
3525 void
3526 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3527 {
3528         uint32_t i;
3529         uint16_t temp;
3530
3531         /*
3532          * We set things to 0xffffffff since this is the last delivered
3533          * sequence and we will be sending in 0 after the reset.
3534          */
3535
3536         if (number_entries) {
3537                 for (i = 0; i < number_entries; i++) {
3538                         temp = ntohs(list[i]);
3539                         if (temp >= stcb->asoc.streamincnt) {
3540                                 continue;
3541                         }
3542                         stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff;
3543                 }
3544         } else {
3545                 list = NULL;
3546                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3547                         stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
3548                 }
3549         }
3550         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3551 }
3552
3553 static void
3554 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3555 {
3556         uint32_t i;
3557         uint16_t temp;
3558
3559         if (number_entries > 0) {
3560                 for (i = 0; i < number_entries; i++) {
3561                         temp = ntohs(list[i]);
3562                         if (temp >= stcb->asoc.streamoutcnt) {
3563                                 /* no such stream */
3564                                 continue;
3565                         }
3566                         stcb->asoc.strmout[temp].next_mid_ordered = 0;
3567                         stcb->asoc.strmout[temp].next_mid_unordered = 0;
3568                 }
3569         } else {
3570                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3571                         stcb->asoc.strmout[i].next_mid_ordered = 0;
3572                         stcb->asoc.strmout[i].next_mid_unordered = 0;
3573                 }
3574         }
3575         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3576 }
3577
3578 static void
3579 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3580 {
3581         uint32_t i;
3582         uint16_t temp;
3583
3584         if (number_entries > 0) {
3585                 for (i = 0; i < number_entries; i++) {
3586                         temp = ntohs(list[i]);
3587                         if (temp >= stcb->asoc.streamoutcnt) {
3588                                 /* no such stream */
3589                                 continue;
3590                         }
3591                         stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN;
3592                 }
3593         } else {
3594                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3595                         stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN;
3596                 }
3597         }
3598 }
3599
3600
3601 struct sctp_stream_reset_request *
3602 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3603 {
3604         struct sctp_association *asoc;
3605         struct sctp_chunkhdr *ch;
3606         struct sctp_stream_reset_request *r;
3607         struct sctp_tmit_chunk *chk;
3608         int len, clen;
3609
3610         asoc = &stcb->asoc;
3611         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3612                 asoc->stream_reset_outstanding = 0;
3613                 return (NULL);
3614         }
3615         if (stcb->asoc.str_reset == NULL) {
3616                 asoc->stream_reset_outstanding = 0;
3617                 return (NULL);
3618         }
3619         chk = stcb->asoc.str_reset;
3620         if (chk->data == NULL) {
3621                 return (NULL);
3622         }
3623         if (bchk) {
3624                 /* he wants a copy of the chk pointer */
3625                 *bchk = chk;
3626         }
3627         clen = chk->send_size;
3628         ch = mtod(chk->data, struct sctp_chunkhdr *);
3629         r = (struct sctp_stream_reset_request *)(ch + 1);
3630         if (ntohl(r->request_seq) == seq) {
3631                 /* found it */
3632                 return (r);
3633         }
3634         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3635         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3636                 /* move to the next one, there can only be a max of two */
3637                 r = (struct sctp_stream_reset_request *)((caddr_t)r + len);
3638                 if (ntohl(r->request_seq) == seq) {
3639                         return (r);
3640                 }
3641         }
3642         /* that seq is not here */
3643         return (NULL);
3644 }
3645
3646 static void
3647 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3648 {
3649         struct sctp_association *asoc;
3650         struct sctp_tmit_chunk *chk;
3651
3652         asoc = &stcb->asoc;
3653         chk = asoc->str_reset;
3654         if (chk == NULL) {
3655                 return;
3656         }
3657         asoc->str_reset = NULL;
3658         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb,
3659             chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28);
3660         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
3661         asoc->ctrl_queue_cnt--;
3662         if (chk->data) {
3663                 sctp_m_freem(chk->data);
3664                 chk->data = NULL;
3665         }
3666         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3667 }
3668
3669
3670 static int
3671 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3672     uint32_t seq, uint32_t action,
3673     struct sctp_stream_reset_response *respin)
3674 {
3675         uint16_t type;
3676         int lparam_len;
3677         struct sctp_association *asoc = &stcb->asoc;
3678         struct sctp_tmit_chunk *chk;
3679         struct sctp_stream_reset_request *req_param;
3680         struct sctp_stream_reset_out_request *req_out_param;
3681         struct sctp_stream_reset_in_request *req_in_param;
3682         uint32_t number_entries;
3683
3684         if (asoc->stream_reset_outstanding == 0) {
3685                 /* duplicate */
3686                 return (0);
3687         }
3688         if (seq == stcb->asoc.str_reset_seq_out) {
3689                 req_param = sctp_find_stream_reset(stcb, seq, &chk);
3690                 if (req_param != NULL) {
3691                         stcb->asoc.str_reset_seq_out++;
3692                         type = ntohs(req_param->ph.param_type);
3693                         lparam_len = ntohs(req_param->ph.param_length);
3694                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3695                                 int no_clear = 0;
3696
3697                                 req_out_param = (struct sctp_stream_reset_out_request *)req_param;
3698                                 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3699                                 asoc->stream_reset_out_is_outstanding = 0;
3700                                 if (asoc->stream_reset_outstanding)
3701                                         asoc->stream_reset_outstanding--;
3702                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3703                                         /* do it */
3704                                         sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
3705                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3706                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3707                                 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) {
3708                                         /*
3709                                          * Set it up so we don't stop
3710                                          * retransmitting
3711                                          */
3712                                         asoc->stream_reset_outstanding++;
3713                                         stcb->asoc.str_reset_seq_out--;
3714                                         asoc->stream_reset_out_is_outstanding = 1;
3715                                         no_clear = 1;
3716                                 } else {
3717                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3718                                 }
3719                                 if (no_clear == 0) {
3720                                         sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams);
3721                                 }
3722                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3723                                 req_in_param = (struct sctp_stream_reset_in_request *)req_param;
3724                                 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3725                                 if (asoc->stream_reset_outstanding)
3726                                         asoc->stream_reset_outstanding--;
3727                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3728                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3729                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3730                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3731                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3732                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3733                                 }
3734                         } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3735                                 /* Ok we now may have more streams */
3736                                 int num_stream;
3737
3738                                 num_stream = stcb->asoc.strm_pending_add_size;
3739                                 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3740                                         /* TSNH */
3741                                         num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3742                                 }
3743                                 stcb->asoc.strm_pending_add_size = 0;
3744                                 if (asoc->stream_reset_outstanding)
3745                                         asoc->stream_reset_outstanding--;
3746                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3747                                         /* Put the new streams into effect */
3748                                         int i;
3749
3750                                         for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) {
3751                                                 asoc->strmout[i].state = SCTP_STREAM_OPEN;
3752                                         }
3753                                         asoc->streamoutcnt += num_stream;
3754                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3755                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3756                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3757                                             SCTP_STREAM_CHANGE_DENIED);
3758                                 } else {
3759                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3760                                             SCTP_STREAM_CHANGE_FAILED);
3761                                 }
3762                         } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3763                                 if (asoc->stream_reset_outstanding)
3764                                         asoc->stream_reset_outstanding--;
3765                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3766                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3767                                             SCTP_STREAM_CHANGE_DENIED);
3768                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3769                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3770                                             SCTP_STREAM_CHANGE_FAILED);
3771                                 }
3772                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3773                                 /**
3774                                  * a) Adopt the new in tsn.
3775                                  * b) reset the map
3776                                  * c) Adopt the new out-tsn
3777                                  */
3778                                 struct sctp_stream_reset_response_tsn *resp;
3779                                 struct sctp_forward_tsn_chunk fwdtsn;
3780                                 int abort_flag = 0;
3781
3782                                 if (respin == NULL) {
3783                                         /* huh ? */
3784                                         return (0);
3785                                 }
3786                                 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
3787                                         return (0);
3788                                 }
3789                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3790                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3791                                         asoc->stream_reset_outstanding--;
3792                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3793                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3794                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3795                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3796                                         if (abort_flag) {
3797                                                 return (1);
3798                                         }
3799                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3800                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3801                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3802                                         }
3803
3804                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3805                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3806                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3807
3808                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3809                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3810
3811                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3812                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3813
3814                                         sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3815                                         sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3816                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3817                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3818                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3819                                             SCTP_ASSOC_RESET_DENIED);
3820                                 } else {
3821                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3822                                             SCTP_ASSOC_RESET_FAILED);
3823                                 }
3824                         }
3825                         /* get rid of the request and get the request flags */
3826                         if (asoc->stream_reset_outstanding == 0) {
3827                                 sctp_clean_up_stream_reset(stcb);
3828                         }
3829                 }
3830         }
3831         if (asoc->stream_reset_outstanding == 0) {
3832                 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3833         }
3834         return (0);
3835 }
3836
3837 static void
3838 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3839     struct sctp_tmit_chunk *chk,
3840     struct sctp_stream_reset_in_request *req, int trunc)
3841 {
3842         uint32_t seq;
3843         int len, i;
3844         int number_entries;
3845         uint16_t temp;
3846
3847         /*
3848          * peer wants me to send a str-reset to him for my outgoing seq's if
3849          * seq_in is right.
3850          */
3851         struct sctp_association *asoc = &stcb->asoc;
3852
3853         seq = ntohl(req->request_seq);
3854         if (asoc->str_reset_seq_in == seq) {
3855                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3856                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3857                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3858                 } else if (trunc) {
3859                         /* Can't do it, since they exceeded our buffer size  */
3860                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3861                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3862                         len = ntohs(req->ph.param_length);
3863                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3864                         if (number_entries) {
3865                                 for (i = 0; i < number_entries; i++) {
3866                                         temp = ntohs(req->list_of_streams[i]);
3867                                         if (temp >= stcb->asoc.streamoutcnt) {
3868                                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3869                                                 goto bad_boy;
3870                                         }
3871                                         req->list_of_streams[i] = temp;
3872                                 }
3873                                 for (i = 0; i < number_entries; i++) {
3874                                         if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) {
3875                                                 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING;
3876                                         }
3877                                 }
3878                         } else {
3879                                 /* Its all */
3880                                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3881                                         if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN)
3882                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING;
3883                                 }
3884                         }
3885                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3886                 } else {
3887                         /* Can't do it, since we have sent one out */
3888                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3889                 }
3890 bad_boy:
3891                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3892                 asoc->str_reset_seq_in++;
3893         } else if (asoc->str_reset_seq_in - 1 == seq) {
3894                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3895         } else if (asoc->str_reset_seq_in - 2 == seq) {
3896                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3897         } else {
3898                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3899         }
3900         sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3901 }
3902
3903 static int
3904 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3905     struct sctp_tmit_chunk *chk,
3906     struct sctp_stream_reset_tsn_request *req)
3907 {
3908         /* reset all in and out and update the tsn */
3909         /*
3910          * A) reset my str-seq's on in and out. B) Select a receive next,
3911          * and set cum-ack to it. Also process this selected number as a
3912          * fwd-tsn as well. C) set in the response my next sending seq.
3913          */
3914         struct sctp_forward_tsn_chunk fwdtsn;
3915         struct sctp_association *asoc = &stcb->asoc;
3916         int abort_flag = 0;
3917         uint32_t seq;
3918
3919         seq = ntohl(req->request_seq);
3920         if (asoc->str_reset_seq_in == seq) {
3921                 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3922                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3923                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3924                 } else {
3925                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3926                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3927                         fwdtsn.ch.chunk_flags = 0;
3928                         fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3929                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3930                         if (abort_flag) {
3931                                 return (1);
3932                         }
3933                         asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3934                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3935                                 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3936                         }
3937                         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3938                         asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3939                         memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3940                         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3941                         memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3942                         atomic_add_int(&asoc->sending_seq, 1);
3943                         /* save off historical data for retrans */
3944                         asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3945                         asoc->last_sending_seq[0] = asoc->sending_seq;
3946                         asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3947                         asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3948                         sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3949                         sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3950                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3951                         sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3952                 }
3953                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3954                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3955                 asoc->str_reset_seq_in++;
3956         } else if (asoc->str_reset_seq_in - 1 == seq) {
3957                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3958                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3959         } else if (asoc->str_reset_seq_in - 2 == seq) {
3960                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3961                     asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3962         } else {
3963                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3964         }
3965         return (0);
3966 }
3967
3968 static void
3969 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3970     struct sctp_tmit_chunk *chk,
3971     struct sctp_stream_reset_out_request *req, int trunc)
3972 {
3973         uint32_t seq, tsn;
3974         int number_entries, len;
3975         struct sctp_association *asoc = &stcb->asoc;
3976
3977         seq = ntohl(req->request_seq);
3978
3979         /* now if its not a duplicate we process it */
3980         if (asoc->str_reset_seq_in == seq) {
3981                 len = ntohs(req->ph.param_length);
3982                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3983                 /*
3984                  * the sender is resetting, handle the list issue.. we must
3985                  * a) verify if we can do the reset, if so no problem b) If
3986                  * we can't do the reset we must copy the request. c) queue
3987                  * it, and setup the data in processor to trigger it off
3988                  * when needed and dequeue all the queued data.
3989                  */
3990                 tsn = ntohl(req->send_reset_at_tsn);
3991
3992                 /* move the reset action back one */
3993                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3994                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3995                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3996                 } else if (trunc) {
3997                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3998                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3999                         /* we can do it now */
4000                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
4001                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4002                 } else {
4003                         /*
4004                          * we must queue it up and thus wait for the TSN's
4005                          * to arrive that are at or before tsn
4006                          */
4007                         struct sctp_stream_reset_list *liste;
4008                         int siz;
4009
4010                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
4011                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
4012                             siz, SCTP_M_STRESET);
4013                         if (liste == NULL) {
4014                                 /* gak out of memory */
4015                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4016                                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4017                                 return;
4018                         }
4019                         liste->seq = seq;
4020                         liste->tsn = tsn;
4021                         liste->number_entries = number_entries;
4022                         memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
4023                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
4024                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS;
4025                 }
4026                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4027                 asoc->str_reset_seq_in++;
4028         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4029                 /*
4030                  * one seq back, just echo back last action since my
4031                  * response was lost.
4032                  */
4033                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4034         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4035                 /*
4036                  * two seq back, just echo back last action since my
4037                  * response was lost.
4038                  */
4039                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4040         } else {
4041                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4042         }
4043 }
4044
4045 static void
4046 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
4047     struct sctp_stream_reset_add_strm *str_add)
4048 {
4049         /*
4050          * Peer is requesting to add more streams. If its within our
4051          * max-streams we will allow it.
4052          */
4053         uint32_t num_stream, i;
4054         uint32_t seq;
4055         struct sctp_association *asoc = &stcb->asoc;
4056         struct sctp_queued_to_read *ctl, *nctl;
4057
4058         /* Get the number. */
4059         seq = ntohl(str_add->request_seq);
4060         num_stream = ntohs(str_add->number_of_streams);
4061         /* Now what would be the new total? */
4062         if (asoc->str_reset_seq_in == seq) {
4063                 num_stream += stcb->asoc.streamincnt;
4064                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4065                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4066                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4067                 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
4068                     (num_stream > 0xffff)) {
4069                         /* We must reject it they ask for to many */
4070         denied:
4071                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4072                 } else {
4073                         /* Ok, we can do that :-) */
4074                         struct sctp_stream_in *oldstrm;
4075
4076                         /* save off the old */
4077                         oldstrm = stcb->asoc.strmin;
4078                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
4079                             (num_stream * sizeof(struct sctp_stream_in)),
4080                             SCTP_M_STRMI);
4081                         if (stcb->asoc.strmin == NULL) {
4082                                 stcb->asoc.strmin = oldstrm;
4083                                 goto denied;
4084                         }
4085                         /* copy off the old data */
4086                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
4087                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
4088                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
4089                                 stcb->asoc.strmin[i].sid = i;
4090                                 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered;
4091                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
4092                                 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started;
4093                                 /* now anything on those queues? */
4094                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) {
4095                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm);
4096                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm);
4097                                 }
4098                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) {
4099                                         TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm);
4100                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm);
4101                                 }
4102                         }
4103                         /* Init the new streams */
4104                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
4105                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
4106                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
4107                                 stcb->asoc.strmin[i].sid = i;
4108                                 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
4109                                 stcb->asoc.strmin[i].pd_api_started = 0;
4110                                 stcb->asoc.strmin[i].delivery_started = 0;
4111                         }
4112                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
4113                         /* update the size */
4114                         stcb->asoc.streamincnt = num_stream;
4115                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4116                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
4117                 }
4118                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4119                 asoc->str_reset_seq_in++;
4120         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4121                 /*
4122                  * one seq back, just echo back last action since my
4123                  * response was lost.
4124                  */
4125                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4126         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4127                 /*
4128                  * two seq back, just echo back last action since my
4129                  * response was lost.
4130                  */
4131                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4132         } else {
4133                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4134
4135         }
4136 }
4137
4138 static void
4139 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
4140     struct sctp_stream_reset_add_strm *str_add)
4141 {
4142         /*
4143          * Peer is requesting to add more streams. If its within our
4144          * max-streams we will allow it.
4145          */
4146         uint16_t num_stream;
4147         uint32_t seq;
4148         struct sctp_association *asoc = &stcb->asoc;
4149
4150         /* Get the number. */
4151         seq = ntohl(str_add->request_seq);
4152         num_stream = ntohs(str_add->number_of_streams);
4153         /* Now what would be the new total? */
4154         if (asoc->str_reset_seq_in == seq) {
4155                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4156                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4157                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4158                 } else if (stcb->asoc.stream_reset_outstanding) {
4159                         /* We must reject it we have something pending */
4160                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
4161                 } else {
4162                         /* Ok, we can do that :-) */
4163                         int mychk;
4164
4165                         mychk = stcb->asoc.streamoutcnt;
4166                         mychk += num_stream;
4167                         if (mychk < 0x10000) {
4168                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4169                                 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) {
4170                                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4171                                 }
4172                         } else {
4173                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4174                         }
4175                 }
4176                 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
4177                 asoc->str_reset_seq_in++;
4178         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4179                 /*
4180                  * one seq back, just echo back last action since my
4181                  * response was lost.
4182                  */
4183                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4184         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4185                 /*
4186                  * two seq back, just echo back last action since my
4187                  * response was lost.
4188                  */
4189                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4190         } else {
4191                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4192         }
4193 }
4194
4195 #ifdef __GNUC__
4196 __attribute__((noinline))
4197 #endif
4198 static int
4199 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
4200     struct sctp_chunkhdr *ch_req)
4201 {
4202         uint16_t remaining_length, param_len, ptype;
4203         struct sctp_paramhdr pstore;
4204         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
4205         uint32_t seq = 0;
4206         int num_req = 0;
4207         int trunc = 0;
4208         struct sctp_tmit_chunk *chk;
4209         struct sctp_chunkhdr *ch;
4210         struct sctp_paramhdr *ph;
4211         int ret_code = 0;
4212         int num_param = 0;
4213
4214         /* now it may be a reset or a reset-response */
4215         remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
4216
4217         /* setup for adding the response */
4218         sctp_alloc_a_chunk(stcb, chk);
4219         if (chk == NULL) {
4220                 return (ret_code);
4221         }
4222         chk->copy_by_ref = 0;
4223         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
4224         chk->rec.chunk_id.can_take_data = 0;
4225         chk->flags = 0;
4226         chk->asoc = &stcb->asoc;
4227         chk->no_fr_allowed = 0;
4228         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
4229         chk->book_size_scale = 0;
4230         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
4231         if (chk->data == NULL) {
4232 strres_nochunk:
4233                 if (chk->data) {
4234                         sctp_m_freem(chk->data);
4235                         chk->data = NULL;
4236                 }
4237                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
4238                 return (ret_code);
4239         }
4240         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
4241
4242         /* setup chunk parameters */
4243         chk->sent = SCTP_DATAGRAM_UNSENT;
4244         chk->snd_count = 0;
4245         chk->whoTo = NULL;
4246
4247         ch = mtod(chk->data, struct sctp_chunkhdr *);
4248         ch->chunk_type = SCTP_STREAM_RESET;
4249         ch->chunk_flags = 0;
4250         ch->chunk_length = htons(chk->send_size);
4251         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4252         offset += sizeof(struct sctp_chunkhdr);
4253         while (remaining_length >= sizeof(struct sctp_paramhdr)) {
4254                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore);
4255                 if (ph == NULL) {
4256                         /* TSNH */
4257                         break;
4258                 }
4259                 param_len = ntohs(ph->param_length);
4260                 if ((param_len > remaining_length) ||
4261                     (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
4262                         /* bad parameter length */
4263                         break;
4264                 }
4265                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
4266                     (uint8_t *)&cstore);
4267                 if (ph == NULL) {
4268                         /* TSNH */
4269                         break;
4270                 }
4271                 ptype = ntohs(ph->param_type);
4272                 num_param++;
4273                 if (param_len > sizeof(cstore)) {
4274                         trunc = 1;
4275                 } else {
4276                         trunc = 0;
4277                 }
4278                 if (num_param > SCTP_MAX_RESET_PARAMS) {
4279                         /* hit the max of parameters already sorry.. */
4280                         break;
4281                 }
4282                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4283                         struct sctp_stream_reset_out_request *req_out;
4284
4285                         if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
4286                                 break;
4287                         }
4288                         req_out = (struct sctp_stream_reset_out_request *)ph;
4289                         num_req++;
4290                         if (stcb->asoc.stream_reset_outstanding) {
4291                                 seq = ntohl(req_out->response_seq);
4292                                 if (seq == stcb->asoc.str_reset_seq_out) {
4293                                         /* implicit ack */
4294                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4295                                 }
4296                         }
4297                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4298                 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4299                         struct sctp_stream_reset_add_strm *str_add;
4300
4301                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4302                                 break;
4303                         }
4304                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4305                         num_req++;
4306                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4307                 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4308                         struct sctp_stream_reset_add_strm *str_add;
4309
4310                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4311                                 break;
4312                         }
4313                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4314                         num_req++;
4315                         sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4316                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4317                         struct sctp_stream_reset_in_request *req_in;
4318
4319                         num_req++;
4320                         req_in = (struct sctp_stream_reset_in_request *)ph;
4321                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4322                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4323                         struct sctp_stream_reset_tsn_request *req_tsn;
4324
4325                         num_req++;
4326                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4327                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4328                                 ret_code = 1;
4329                                 goto strres_nochunk;
4330                         }
4331                         /* no more */
4332                         break;
4333                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4334                         struct sctp_stream_reset_response *resp;
4335                         uint32_t result;
4336
4337                         if (param_len < sizeof(struct sctp_stream_reset_response)) {
4338                                 break;
4339                         }
4340                         resp = (struct sctp_stream_reset_response *)ph;
4341                         seq = ntohl(resp->response_seq);
4342                         result = ntohl(resp->result);
4343                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4344                                 ret_code = 1;
4345                                 goto strres_nochunk;
4346                         }
4347                 } else {
4348                         break;
4349                 }
4350                 offset += SCTP_SIZE32(param_len);
4351                 if (remaining_length >= SCTP_SIZE32(param_len)) {
4352                         remaining_length -= SCTP_SIZE32(param_len);
4353                 } else {
4354                         remaining_length = 0;
4355                 }
4356         }
4357         if (num_req == 0) {
4358                 /* we have no response free the stuff */
4359                 goto strres_nochunk;
4360         }
4361         /* ok we have a chunk to link in */
4362         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4363             chk,
4364             sctp_next);
4365         stcb->asoc.ctrl_queue_cnt++;
4366         return (ret_code);
4367 }
4368
4369 /*
4370  * Handle a router or endpoints report of a packet loss, there are two ways
4371  * to handle this, either we get the whole packet and must disect it
4372  * ourselves (possibly with truncation and or corruption) or it is a summary
4373  * from a middle box that did the disectting for us.
4374  */
4375 static void
4376 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4377     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4378 {
4379         uint32_t bottle_bw, on_queue;
4380         uint16_t trunc_len;
4381         unsigned int chlen;
4382         unsigned int at;
4383         struct sctp_chunk_desc desc;
4384         struct sctp_chunkhdr *ch;
4385
4386         chlen = ntohs(cp->ch.chunk_length);
4387         chlen -= sizeof(struct sctp_pktdrop_chunk);
4388         /* XXX possible chlen underflow */
4389         if (chlen == 0) {
4390                 ch = NULL;
4391                 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
4392                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4393         } else {
4394                 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
4395                 chlen -= sizeof(struct sctphdr);
4396                 /* XXX possible chlen underflow */
4397                 memset(&desc, 0, sizeof(desc));
4398         }
4399         trunc_len = (uint16_t)ntohs(cp->trunc_len);
4400         if (trunc_len > limit) {
4401                 trunc_len = limit;
4402         }
4403
4404         /* now the chunks themselves */
4405         while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
4406                 desc.chunk_type = ch->chunk_type;
4407                 /* get amount we need to move */
4408                 at = ntohs(ch->chunk_length);
4409                 if (at < sizeof(struct sctp_chunkhdr)) {
4410                         /* corrupt chunk, maybe at the end? */
4411                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4412                         break;
4413                 }
4414                 if (trunc_len == 0) {
4415                         /* we are supposed to have all of it */
4416                         if (at > chlen) {
4417                                 /* corrupt skip it */
4418                                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4419                                 break;
4420                         }
4421                 } else {
4422                         /* is there enough of it left ? */
4423                         if (desc.chunk_type == SCTP_DATA) {
4424                                 if (chlen < (sizeof(struct sctp_data_chunk) +
4425                                     sizeof(desc.data_bytes))) {
4426                                         break;
4427                                 }
4428                         } else {
4429                                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4430                                         break;
4431                                 }
4432                         }
4433                 }
4434                 if (desc.chunk_type == SCTP_DATA) {
4435                         /* can we get out the tsn? */
4436                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4437                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4438
4439                         if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
4440                                 /* yep */
4441                                 struct sctp_data_chunk *dcp;
4442                                 uint8_t *ddp;
4443                                 unsigned int iii;
4444
4445                                 dcp = (struct sctp_data_chunk *)ch;
4446                                 ddp = (uint8_t *)(dcp + 1);
4447                                 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
4448                                         desc.data_bytes[iii] = ddp[iii];
4449                                 }
4450                                 desc.tsn_ifany = dcp->dp.tsn;
4451                         } else {
4452                                 /* nope we are done. */
4453                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4454                                 break;
4455                         }
4456                 } else {
4457                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4458                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4459                 }
4460
4461                 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
4462                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4463                         break;
4464                 }
4465                 if (SCTP_SIZE32(at) > chlen) {
4466                         break;
4467                 }
4468                 chlen -= SCTP_SIZE32(at);
4469                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4470                         /* done, none left */
4471                         break;
4472                 }
4473                 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
4474         }
4475         /* Now update any rwnd --- possibly */
4476         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4477                 /* From a peer, we get a rwnd report */
4478                 uint32_t a_rwnd;
4479
4480                 SCTP_STAT_INCR(sctps_pdrpfehos);
4481
4482                 bottle_bw = ntohl(cp->bottle_bw);
4483                 on_queue = ntohl(cp->current_onq);
4484                 if (bottle_bw && on_queue) {
4485                         /* a rwnd report is in here */
4486                         if (bottle_bw > on_queue)
4487                                 a_rwnd = bottle_bw - on_queue;
4488                         else
4489                                 a_rwnd = 0;
4490
4491                         if (a_rwnd == 0)
4492                                 stcb->asoc.peers_rwnd = 0;
4493                         else {
4494                                 if (a_rwnd > stcb->asoc.total_flight) {
4495                                         stcb->asoc.peers_rwnd =
4496                                             a_rwnd - stcb->asoc.total_flight;
4497                                 } else {
4498                                         stcb->asoc.peers_rwnd = 0;
4499                                 }
4500                                 if (stcb->asoc.peers_rwnd <
4501                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4502                                         /* SWS sender side engages */
4503                                         stcb->asoc.peers_rwnd = 0;
4504                                 }
4505                         }
4506                 }
4507         } else {
4508                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4509         }
4510
4511         /* now middle boxes in sat networks get a cwnd bump */
4512         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
4513             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4514             (stcb->asoc.sat_network)) {
4515                 /*
4516                  * This is debatable but for sat networks it makes sense
4517                  * Note if a T3 timer has went off, we will prohibit any
4518                  * changes to cwnd until we exit the t3 loss recovery.
4519                  */
4520                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4521                     net, cp, &bottle_bw, &on_queue);
4522         }
4523 }
4524
4525 /*
4526  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4527  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4528  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4529  * length of the complete packet outputs: - length: modified to remaining
4530  * length after control processing - netp: modified to new sctp_nets after
4531  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4532  * bad packet,...) otherwise return the tcb for this packet
4533  */
4534 #ifdef __GNUC__
4535 __attribute__((noinline))
4536 #endif
4537 static struct sctp_tcb *
4538 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4539     struct sockaddr *src, struct sockaddr *dst,
4540     struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4541     struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4542     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
4543     uint32_t vrf_id, uint16_t port)
4544 {
4545         struct sctp_association *asoc;
4546         struct mbuf *op_err;
4547         char msg[SCTP_DIAG_INFO_LEN];
4548         uint32_t vtag_in;
4549         int num_chunks = 0;     /* number of control chunks processed */
4550         uint32_t chk_length, contiguous;
4551         int ret;
4552         int abort_no_unlock = 0;
4553         int ecne_seen = 0;
4554
4555         /*
4556          * How big should this be, and should it be alloc'd? Lets try the
4557          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4558          * until we get into jumbo grams and such..
4559          */
4560         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4561         int got_auth = 0;
4562         uint32_t auth_offset = 0, auth_len = 0;
4563         int auth_skipped = 0;
4564         int asconf_cnt = 0;
4565 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4566         struct socket *so;
4567 #endif
4568
4569         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4570             iphlen, *offset, length, (void *)stcb);
4571
4572         if (stcb) {
4573                 SCTP_TCB_LOCK_ASSERT(stcb);
4574         }
4575         /* validate chunk header length... */
4576         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4577                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4578                     ntohs(ch->chunk_length));
4579                 *offset = length;
4580                 return (stcb);
4581         }
4582         /*
4583          * validate the verification tag
4584          */
4585         vtag_in = ntohl(sh->v_tag);
4586
4587         if (ch->chunk_type == SCTP_INITIATION) {
4588                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4589                     ntohs(ch->chunk_length), vtag_in);
4590                 if (vtag_in != 0) {
4591                         /* protocol error- silently discard... */
4592                         SCTP_STAT_INCR(sctps_badvtag);
4593                         if (stcb != NULL) {
4594                                 SCTP_TCB_UNLOCK(stcb);
4595                         }
4596                         return (NULL);
4597                 }
4598         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4599                 /*
4600                  * If there is no stcb, skip the AUTH chunk and process
4601                  * later after a stcb is found (to validate the lookup was
4602                  * valid.
4603                  */
4604                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4605                     (stcb == NULL) &&
4606                     (inp->auth_supported == 1)) {
4607                         /* save this chunk for later processing */
4608                         auth_skipped = 1;
4609                         auth_offset = *offset;
4610                         auth_len = ntohs(ch->chunk_length);
4611
4612                         /* (temporarily) move past this chunk */
4613                         *offset += SCTP_SIZE32(auth_len);
4614                         if (*offset >= length) {
4615                                 /* no more data left in the mbuf chain */
4616                                 *offset = length;
4617                                 return (NULL);
4618                         }
4619                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4620                             sizeof(struct sctp_chunkhdr), chunk_buf);
4621                 }
4622                 if (ch == NULL) {
4623                         /* Help */
4624                         *offset = length;
4625                         return (stcb);
4626                 }
4627                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4628                         goto process_control_chunks;
4629                 }
4630                 /*
4631                  * first check if it's an ASCONF with an unknown src addr we
4632                  * need to look inside to find the association
4633                  */
4634                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4635                         struct sctp_chunkhdr *asconf_ch = ch;
4636                         uint32_t asconf_offset = 0, asconf_len = 0;
4637
4638                         /* inp's refcount may be reduced */
4639                         SCTP_INP_INCR_REF(inp);
4640
4641                         asconf_offset = *offset;
4642                         do {
4643                                 asconf_len = ntohs(asconf_ch->chunk_length);
4644                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4645                                         break;
4646                                 stcb = sctp_findassociation_ep_asconf(m,
4647                                     *offset,
4648                                     dst,
4649                                     sh, &inp, netp, vrf_id);
4650                                 if (stcb != NULL)
4651                                         break;
4652                                 asconf_offset += SCTP_SIZE32(asconf_len);
4653                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4654                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4655                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4656                         if (stcb == NULL) {
4657                                 /*
4658                                  * reduce inp's refcount if not reduced in
4659                                  * sctp_findassociation_ep_asconf().
4660                                  */
4661                                 SCTP_INP_DECR_REF(inp);
4662                         }
4663
4664                         /* now go back and verify any auth chunk to be sure */
4665                         if (auth_skipped && (stcb != NULL)) {
4666                                 struct sctp_auth_chunk *auth;
4667
4668                                 auth = (struct sctp_auth_chunk *)
4669                                     sctp_m_getptr(m, auth_offset,
4670                                     auth_len, chunk_buf);
4671                                 got_auth = 1;
4672                                 auth_skipped = 0;
4673                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4674                                     auth_offset)) {
4675                                         /* auth HMAC failed so dump it */
4676                                         *offset = length;
4677                                         return (stcb);
4678                                 } else {
4679                                         /* remaining chunks are HMAC checked */
4680                                         stcb->asoc.authenticated = 1;
4681                                 }
4682                         }
4683                 }
4684                 if (stcb == NULL) {
4685                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4686                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4687                             msg);
4688                         /* no association, so it's out of the blue... */
4689                         sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
4690                             mflowtype, mflowid, inp->fibnum,
4691                             vrf_id, port);
4692                         *offset = length;
4693                         return (NULL);
4694                 }
4695                 asoc = &stcb->asoc;
4696                 /* ABORT and SHUTDOWN can use either v_tag... */
4697                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4698                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4699                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4700                         /* Take the T-bit always into account. */
4701                         if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
4702                             (vtag_in == asoc->my_vtag)) ||
4703                             (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
4704                             (asoc->peer_vtag != htonl(0)) &&
4705                             (vtag_in == asoc->peer_vtag))) {
4706                                 /* this is valid */
4707                         } else {
4708                                 /* drop this packet... */
4709                                 SCTP_STAT_INCR(sctps_badvtag);
4710                                 if (stcb != NULL) {
4711                                         SCTP_TCB_UNLOCK(stcb);
4712                                 }
4713                                 return (NULL);
4714                         }
4715                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4716                         if (vtag_in != asoc->my_vtag) {
4717                                 /*
4718                                  * this could be a stale SHUTDOWN-ACK or the
4719                                  * peer never got the SHUTDOWN-COMPLETE and
4720                                  * is still hung; we have started a new asoc
4721                                  * but it won't complete until the shutdown
4722                                  * is completed
4723                                  */
4724                                 if (stcb != NULL) {
4725                                         SCTP_TCB_UNLOCK(stcb);
4726                                 }
4727                                 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4728                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4729                                     msg);
4730                                 sctp_handle_ootb(m, iphlen, *offset, src, dst,
4731                                     sh, inp, op_err,
4732                                     mflowtype, mflowid, fibnum,
4733                                     vrf_id, port);
4734                                 return (NULL);
4735                         }
4736                 } else {
4737                         /* for all other chunks, vtag must match */
4738                         if (vtag_in != asoc->my_vtag) {
4739                                 /* invalid vtag... */
4740                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4741                                     "invalid vtag: %xh, expect %xh\n",
4742                                     vtag_in, asoc->my_vtag);
4743                                 SCTP_STAT_INCR(sctps_badvtag);
4744                                 if (stcb != NULL) {
4745                                         SCTP_TCB_UNLOCK(stcb);
4746                                 }
4747                                 *offset = length;
4748                                 return (NULL);
4749                         }
4750                 }
4751         }                       /* end if !SCTP_COOKIE_ECHO */
4752         /*
4753          * process all control chunks...
4754          */
4755         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4756             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4757             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4758             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
4759                 /* implied cookie-ack.. we must have lost the ack */
4760                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4761                     *netp);
4762         }
4763
4764 process_control_chunks:
4765         while (IS_SCTP_CONTROL(ch)) {
4766                 /* validate chunk length */
4767                 chk_length = ntohs(ch->chunk_length);
4768                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4769                     ch->chunk_type, chk_length);
4770                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4771                 if (chk_length < sizeof(*ch) ||
4772                     (*offset + (int)chk_length) > length) {
4773                         *offset = length;
4774                         return (stcb);
4775                 }
4776                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4777                 /*
4778                  * INIT and INIT-ACK only gets the init ack "header" portion
4779                  * only because we don't have to process the peer's COOKIE.
4780                  * All others get a complete chunk.
4781                  */
4782                 switch (ch->chunk_type) {
4783                 case SCTP_INITIATION:
4784                         contiguous = sizeof(struct sctp_init_chunk);
4785                         break;
4786                 case SCTP_INITIATION_ACK:
4787                         contiguous = sizeof(struct sctp_init_ack_chunk);
4788                         break;
4789                 default:
4790                         contiguous = min(chk_length, sizeof(chunk_buf));
4791                         break;
4792                 }
4793                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4794                     contiguous,
4795                     chunk_buf);
4796                 if (ch == NULL) {
4797                         *offset = length;
4798                         if (stcb != NULL) {
4799                                 SCTP_TCB_UNLOCK(stcb);
4800                         }
4801                         return (NULL);
4802                 }
4803
4804                 num_chunks++;
4805                 /* Save off the last place we got a control from */
4806                 if (stcb != NULL) {
4807                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4808                                 /*
4809                                  * allow last_control to be NULL if
4810                                  * ASCONF... ASCONF processing will find the
4811                                  * right net later
4812                                  */
4813                                 if ((netp != NULL) && (*netp != NULL))
4814                                         stcb->asoc.last_control_chunk_from = *netp;
4815                         }
4816                 }
4817 #ifdef SCTP_AUDITING_ENABLED
4818                 sctp_audit_log(0xB0, ch->chunk_type);
4819 #endif
4820
4821                 /* check to see if this chunk required auth, but isn't */
4822                 if ((stcb != NULL) &&
4823                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4824                     !stcb->asoc.authenticated) {
4825                         /* "silently" ignore */
4826                         SCTP_STAT_INCR(sctps_recvauthmissing);
4827                         goto next_chunk;
4828                 }
4829                 switch (ch->chunk_type) {
4830                 case SCTP_INITIATION:
4831                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4832                         /* The INIT chunk must be the only chunk. */
4833                         if ((num_chunks > 1) ||
4834                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4835                                 /* RFC 4960 requires that no ABORT is sent */
4836                                 *offset = length;
4837                                 if (stcb != NULL) {
4838                                         SCTP_TCB_UNLOCK(stcb);
4839                                 }
4840                                 return (NULL);
4841                         }
4842                         /* Honor our resource limit. */
4843                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4844                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4845                                 sctp_abort_association(inp, stcb, m, iphlen,
4846                                     src, dst, sh, op_err,
4847                                     mflowtype, mflowid,
4848                                     vrf_id, port);
4849                                 *offset = length;
4850                                 return (NULL);
4851                         }
4852                         sctp_handle_init(m, iphlen, *offset, src, dst, sh,
4853                             (struct sctp_init_chunk *)ch, inp,
4854                             stcb, *netp, &abort_no_unlock,
4855                             mflowtype, mflowid,
4856                             vrf_id, port);
4857                         *offset = length;
4858                         if ((!abort_no_unlock) && (stcb != NULL)) {
4859                                 SCTP_TCB_UNLOCK(stcb);
4860                         }
4861                         return (NULL);
4862                         break;
4863                 case SCTP_PAD_CHUNK:
4864                         break;
4865                 case SCTP_INITIATION_ACK:
4866                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n");
4867                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4868                                 /* We are not interested anymore */
4869                                 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) {
4870                                         ;
4871                                 } else {
4872                                         *offset = length;
4873                                         if (stcb != NULL) {
4874 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4875                                                 so = SCTP_INP_SO(inp);
4876                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4877                                                 SCTP_TCB_UNLOCK(stcb);
4878                                                 SCTP_SOCKET_LOCK(so, 1);
4879                                                 SCTP_TCB_LOCK(stcb);
4880                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4881 #endif
4882                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
4883                                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
4884 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4885                                                 SCTP_SOCKET_UNLOCK(so, 1);
4886 #endif
4887                                         }
4888                                         return (NULL);
4889                                 }
4890                         }
4891                         /* The INIT-ACK chunk must be the only chunk. */
4892                         if ((num_chunks > 1) ||
4893                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4894                                 *offset = length;
4895                                 return (stcb);
4896                         }
4897                         if ((netp != NULL) && (*netp != NULL)) {
4898                                 ret = sctp_handle_init_ack(m, iphlen, *offset,
4899                                     src, dst, sh,
4900                                     (struct sctp_init_ack_chunk *)ch,
4901                                     stcb, *netp,
4902                                     &abort_no_unlock,
4903                                     mflowtype, mflowid,
4904                                     vrf_id);
4905                         } else {
4906                                 ret = -1;
4907                         }
4908                         *offset = length;
4909                         if (abort_no_unlock) {
4910                                 return (NULL);
4911                         }
4912                         /*
4913                          * Special case, I must call the output routine to
4914                          * get the cookie echoed
4915                          */
4916                         if ((stcb != NULL) && (ret == 0)) {
4917                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4918                         }
4919                         return (stcb);
4920                         break;
4921                 case SCTP_SELECTIVE_ACK:
4922                 case SCTP_NR_SELECTIVE_ACK:
4923                         {
4924                                 int abort_now = 0;
4925                                 uint32_t a_rwnd, cum_ack;
4926                                 uint16_t num_seg, num_nr_seg, num_dup;
4927                                 uint8_t flags;
4928                                 int offset_seg, offset_dup;
4929
4930                                 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n",
4931                                     ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK");
4932                                 SCTP_STAT_INCR(sctps_recvsacks);
4933                                 if (stcb == NULL) {
4934                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n",
4935                                             (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK");
4936                                         break;
4937                                 }
4938                                 if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
4939                                         if (chk_length < sizeof(struct sctp_sack_chunk)) {
4940                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4941                                                 break;
4942                                         }
4943                                 } else {
4944                                         if (stcb->asoc.nrsack_supported == 0) {
4945                                                 goto unknown_chunk;
4946                                         }
4947                                         if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
4948                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n");
4949                                                 break;
4950                                         }
4951                                 }
4952                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4953                                         /*-
4954                                          * If we have sent a shutdown-ack, we will pay no
4955                                          * attention to a sack sent in to us since
4956                                          * we don't care anymore.
4957                                          */
4958                                         break;
4959                                 }
4960                                 flags = ch->chunk_flags;
4961                                 if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
4962                                         struct sctp_sack_chunk *sack;
4963
4964                                         sack = (struct sctp_sack_chunk *)ch;
4965                                         cum_ack = ntohl(sack->sack.cum_tsn_ack);
4966                                         num_seg = ntohs(sack->sack.num_gap_ack_blks);
4967                                         num_nr_seg = 0;
4968                                         num_dup = ntohs(sack->sack.num_dup_tsns);
4969                                         a_rwnd = ntohl(sack->sack.a_rwnd);
4970                                         if (sizeof(struct sctp_sack_chunk) +
4971                                             num_seg * sizeof(struct sctp_gap_ack_block) +
4972                                             num_dup * sizeof(uint32_t) != chk_length) {
4973                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4974                                                 break;
4975                                         }
4976                                         offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4977                                         offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4978                                 } else {
4979                                         struct sctp_nr_sack_chunk *nr_sack;
4980
4981                                         nr_sack = (struct sctp_nr_sack_chunk *)ch;
4982                                         cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
4983                                         num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
4984                                         num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
4985                                         num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
4986                                         a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd);
4987                                         if (sizeof(struct sctp_nr_sack_chunk) +
4988                                             (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
4989                                             num_dup * sizeof(uint32_t) != chk_length) {
4990                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
4991                                                 break;
4992                                         }
4993                                         offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
4994                                         offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block);
4995                                 }
4996                                 SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4997                                     (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK",
4998                                     cum_ack, num_seg, a_rwnd);
4999                                 stcb->asoc.seen_a_sack_this_pkt = 1;
5000                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
5001                                     (num_seg == 0) && (num_nr_seg == 0) &&
5002                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
5003                                     (stcb->asoc.saw_sack_with_frags == 0) &&
5004                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
5005                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
5006                                         /*
5007                                          * We have a SIMPLE sack having no
5008                                          * prior segments and data on sent
5009                                          * queue to be acked. Use the faster
5010                                          * path sack processing. We also
5011                                          * allow window update sacks with no
5012                                          * missing segments to go this way
5013                                          * too.
5014                                          */
5015                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
5016                                             &abort_now, ecne_seen);
5017                                 } else {
5018                                         if ((netp != NULL) && (*netp != NULL)) {
5019                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
5020                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
5021                                                     cum_ack, a_rwnd, ecne_seen);
5022                                         }
5023                                 }
5024                                 if (abort_now) {
5025                                         /* ABORT signal from sack processing */
5026                                         *offset = length;
5027                                         return (NULL);
5028                                 }
5029                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
5030                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
5031                                     (stcb->asoc.stream_queue_cnt == 0)) {
5032                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
5033                                 }
5034                                 break;
5035                         }
5036                 case SCTP_HEARTBEAT_REQUEST:
5037                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
5038                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5039                                 SCTP_STAT_INCR(sctps_recvheartbeat);
5040                                 sctp_send_heartbeat_ack(stcb, m, *offset,
5041                                     chk_length, *netp);
5042                         }
5043                         break;
5044                 case SCTP_HEARTBEAT_ACK:
5045                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n");
5046                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
5047                                 /* Its not ours */
5048                                 *offset = length;
5049                                 return (stcb);
5050                         }
5051                         SCTP_STAT_INCR(sctps_recvheartbeatack);
5052                         if ((netp != NULL) && (*netp != NULL)) {
5053                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
5054                                     stcb, *netp);
5055                         }
5056                         break;
5057                 case SCTP_ABORT_ASSOCIATION:
5058                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
5059                             (void *)stcb);
5060                         *offset = length;
5061                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5062                                 if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) {
5063                                         return (NULL);
5064                                 } else {
5065                                         return (stcb);
5066                                 }
5067                         } else {
5068                                 return (NULL);
5069                         }
5070                         break;
5071                 case SCTP_SHUTDOWN:
5072                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
5073                             (void *)stcb);
5074                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
5075                                 *offset = length;
5076                                 return (stcb);
5077                         }
5078                         if ((netp != NULL) && (*netp != NULL)) {
5079                                 int abort_flag = 0;
5080
5081                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
5082                                     stcb, *netp, &abort_flag);
5083                                 if (abort_flag) {
5084                                         *offset = length;
5085                                         return (NULL);
5086                                 }
5087                         }
5088                         break;
5089                 case SCTP_SHUTDOWN_ACK:
5090                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb);
5091                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5092                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
5093                         }
5094                         *offset = length;
5095                         return (NULL);
5096                         break;
5097                 case SCTP_OPERATION_ERROR:
5098                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n");
5099                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) &&
5100                             sctp_handle_error(ch, stcb, *netp, contiguous) < 0) {
5101                                 *offset = length;
5102                                 return (NULL);
5103                         }
5104                         break;
5105                 case SCTP_COOKIE_ECHO:
5106                         SCTPDBG(SCTP_DEBUG_INPUT3,
5107                             "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb);
5108                         if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) {
5109                                 ;
5110                         } else {
5111                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5112                                         /* We are not interested anymore */
5113                         abend:
5114                                         if (stcb != NULL) {
5115                                                 SCTP_TCB_UNLOCK(stcb);
5116                                         }
5117                                         *offset = length;
5118                                         return (NULL);
5119                                 }
5120                         }
5121                         /*-
5122                          * First are we accepting? We do this again here
5123                          * since it is possible that a previous endpoint WAS
5124                          * listening responded to a INIT-ACK and then
5125                          * closed. We opened and bound.. and are now no
5126                          * longer listening.
5127                          *
5128                          * XXXGL: notes on checking listen queue length.
5129                          * 1) SCTP_IS_LISTENING() doesn't necessarily mean
5130                          *    SOLISTENING(), because a listening "UDP type"
5131                          *    socket isn't listening in terms of the socket
5132                          *    layer.  It is a normal data flow socket, that
5133                          *    can fork off new connections.  Thus, we should
5134                          *    look into sol_qlen only in case we are !UDP.
5135                          * 2) Checking sol_qlen in general requires locking
5136                          *    the socket, and this code lacks that.
5137                          */
5138                         if ((stcb == NULL) &&
5139                             (!SCTP_IS_LISTENING(inp) ||
5140                             (!(inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) &&
5141                             inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) {
5142                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
5143                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
5144                                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
5145                                         sctp_abort_association(inp, stcb, m, iphlen,
5146                                             src, dst, sh, op_err,
5147                                             mflowtype, mflowid,
5148                                             vrf_id, port);
5149                                 }
5150                                 *offset = length;
5151                                 return (NULL);
5152                         } else {
5153                                 struct mbuf *ret_buf;
5154                                 struct sctp_inpcb *linp;
5155
5156                                 if (stcb) {
5157                                         linp = NULL;
5158                                 } else {
5159                                         linp = inp;
5160                                 }
5161
5162                                 if (linp != NULL) {
5163                                         SCTP_ASOC_CREATE_LOCK(linp);
5164                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
5165                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
5166                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
5167                                                 goto abend;
5168                                         }
5169                                 }
5170
5171                                 if (netp != NULL) {
5172                                         struct sctp_tcb *locked_stcb;
5173
5174                                         locked_stcb = stcb;
5175                                         ret_buf =
5176                                             sctp_handle_cookie_echo(m, iphlen,
5177                                             *offset,
5178                                             src, dst,
5179                                             sh,
5180                                             (struct sctp_cookie_echo_chunk *)ch,
5181                                             &inp, &stcb, netp,
5182                                             auth_skipped,
5183                                             auth_offset,
5184                                             auth_len,
5185                                             &locked_stcb,
5186                                             mflowtype,
5187                                             mflowid,
5188                                             vrf_id,
5189                                             port);
5190                                         if ((locked_stcb != NULL) && (locked_stcb != stcb)) {
5191                                                 SCTP_TCB_UNLOCK(locked_stcb);
5192                                         }
5193                                         if (stcb != NULL) {
5194                                                 SCTP_TCB_LOCK_ASSERT(stcb);
5195                                         }
5196                                 } else {
5197                                         ret_buf = NULL;
5198                                 }
5199                                 if (linp != NULL) {
5200                                         SCTP_ASOC_CREATE_UNLOCK(linp);
5201                                 }
5202                                 if (ret_buf == NULL) {
5203                                         if (stcb != NULL) {
5204                                                 SCTP_TCB_UNLOCK(stcb);
5205                                         }
5206                                         SCTPDBG(SCTP_DEBUG_INPUT3,
5207                                             "GAK, null buffer\n");
5208                                         *offset = length;
5209                                         return (NULL);
5210                                 }
5211                                 /* if AUTH skipped, see if it verified... */
5212                                 if (auth_skipped) {
5213                                         got_auth = 1;
5214                                         auth_skipped = 0;
5215                                 }
5216                                 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
5217                                         /*
5218                                          * Restart the timer if we have
5219                                          * pending data
5220                                          */
5221                                         struct sctp_tmit_chunk *chk;
5222
5223                                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
5224                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
5225                                 }
5226                         }
5227                         break;
5228                 case SCTP_COOKIE_ACK:
5229                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb);
5230                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5231                                 return (stcb);
5232                         }
5233                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5234                                 /* We are not interested anymore */
5235                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5236                                         ;
5237                                 } else if (stcb) {
5238 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5239                                         so = SCTP_INP_SO(inp);
5240                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5241                                         SCTP_TCB_UNLOCK(stcb);
5242                                         SCTP_SOCKET_LOCK(so, 1);
5243                                         SCTP_TCB_LOCK(stcb);
5244                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5245 #endif
5246                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5247                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
5248 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5249                                         SCTP_SOCKET_UNLOCK(so, 1);
5250 #endif
5251                                         *offset = length;
5252                                         return (NULL);
5253                                 }
5254                         }
5255                         if ((netp != NULL) && (*netp != NULL)) {
5256                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
5257                         }
5258                         break;
5259                 case SCTP_ECN_ECHO:
5260                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n");
5261                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5262                                 /* Its not ours */
5263                                 *offset = length;
5264                                 return (stcb);
5265                         }
5266                         if (stcb->asoc.ecn_supported == 0) {
5267                                 goto unknown_chunk;
5268                         }
5269                         sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb);
5270                         ecne_seen = 1;
5271                         break;
5272                 case SCTP_ECN_CWR:
5273                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n");
5274                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5275                                 *offset = length;
5276                                 return (stcb);
5277                         }
5278                         if (stcb->asoc.ecn_supported == 0) {
5279                                 goto unknown_chunk;
5280                         }
5281                         sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5282                         break;
5283                 case SCTP_SHUTDOWN_COMPLETE:
5284                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb);
5285                         /* must be first and only chunk */
5286                         if ((num_chunks > 1) ||
5287                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5288                                 *offset = length;
5289                                 return (stcb);
5290                         }
5291                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5292                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5293                                     stcb, *netp);
5294                         }
5295                         *offset = length;
5296                         return (NULL);
5297                         break;
5298                 case SCTP_ASCONF:
5299                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5300                         if (stcb != NULL) {
5301                                 if (stcb->asoc.asconf_supported == 0) {
5302                                         goto unknown_chunk;
5303                                 }
5304                                 sctp_handle_asconf(m, *offset, src,
5305                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5306                                 asconf_cnt++;
5307                         }
5308                         break;
5309                 case SCTP_ASCONF_ACK:
5310                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n");
5311                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5312                                 /* Its not ours */
5313                                 *offset = length;
5314                                 return (stcb);
5315                         }
5316                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5317                                 if (stcb->asoc.asconf_supported == 0) {
5318                                         goto unknown_chunk;
5319                                 }
5320                                 /* He's alive so give him credit */
5321                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5322                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5323                                             stcb->asoc.overall_error_count,
5324                                             0,
5325                                             SCTP_FROM_SCTP_INPUT,
5326                                             __LINE__);
5327                                 }
5328                                 stcb->asoc.overall_error_count = 0;
5329                                 sctp_handle_asconf_ack(m, *offset,
5330                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5331                                 if (abort_no_unlock)
5332                                         return (NULL);
5333                         }
5334                         break;
5335                 case SCTP_FORWARD_CUM_TSN:
5336                 case SCTP_IFORWARD_CUM_TSN:
5337                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD_TSN\n");
5338                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5339                                 /* Its not ours */
5340                                 *offset = length;
5341                                 return (stcb);
5342                         }
5343
5344                         if (stcb != NULL) {
5345                                 int abort_flag = 0;
5346
5347                                 if (stcb->asoc.prsctp_supported == 0) {
5348                                         goto unknown_chunk;
5349                                 }
5350                                 *fwd_tsn_seen = 1;
5351                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5352                                         /* We are not interested anymore */
5353 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5354                                         so = SCTP_INP_SO(inp);
5355                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5356                                         SCTP_TCB_UNLOCK(stcb);
5357                                         SCTP_SOCKET_LOCK(so, 1);
5358                                         SCTP_TCB_LOCK(stcb);
5359                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5360 #endif
5361                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5362                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_31);
5363 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5364                                         SCTP_SOCKET_UNLOCK(so, 1);
5365 #endif
5366                                         *offset = length;
5367                                         return (NULL);
5368                                 }
5369                                 /*
5370                                  * For sending a SACK this looks like DATA
5371                                  * chunks.
5372                                  */
5373                                 stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from;
5374                                 sctp_handle_forward_tsn(stcb,
5375                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5376                                 if (abort_flag) {
5377                                         *offset = length;
5378                                         return (NULL);
5379                                 }
5380                         }
5381                         break;
5382                 case SCTP_STREAM_RESET:
5383                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5384                         if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
5385                                 /* Its not ours */
5386                                 *offset = length;
5387                                 return (stcb);
5388                         }
5389                         if (stcb->asoc.reconfig_supported == 0) {
5390                                 goto unknown_chunk;
5391                         }
5392                         if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5393                                 /* stop processing */
5394                                 *offset = length;
5395                                 return (NULL);
5396                         }
5397                         break;
5398                 case SCTP_PACKET_DROPPED:
5399                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5400                         /* re-get it all please */
5401                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5402                                 /* Its not ours */
5403                                 *offset = length;
5404                                 return (stcb);
5405                         }
5406
5407                         if ((ch != NULL) && (stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5408                                 if (stcb->asoc.pktdrop_supported == 0) {
5409                                         goto unknown_chunk;
5410                                 }
5411                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5412                                     stcb, *netp,
5413                                     min(chk_length, contiguous));
5414                         }
5415                         break;
5416                 case SCTP_AUTHENTICATION:
5417                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5418                         if (stcb == NULL) {
5419                                 /* save the first AUTH for later processing */
5420                                 if (auth_skipped == 0) {
5421                                         auth_offset = *offset;
5422                                         auth_len = chk_length;
5423                                         auth_skipped = 1;
5424                                 }
5425                                 /* skip this chunk (temporarily) */
5426                                 goto next_chunk;
5427                         }
5428                         if (stcb->asoc.auth_supported == 0) {
5429                                 goto unknown_chunk;
5430                         }
5431                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5432                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5433                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5434                                 /* Its not ours */
5435                                 *offset = length;
5436                                 return (stcb);
5437                         }
5438                         if (got_auth == 1) {
5439                                 /* skip this chunk... it's already auth'd */
5440                                 goto next_chunk;
5441                         }
5442                         got_auth = 1;
5443                         if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
5444                             m, *offset)) {
5445                                 /* auth HMAC failed so dump the packet */
5446                                 *offset = length;
5447                                 return (stcb);
5448                         } else {
5449                                 /* remaining chunks are HMAC checked */
5450                                 stcb->asoc.authenticated = 1;
5451                         }
5452                         break;
5453
5454                 default:
5455         unknown_chunk:
5456                         /* it's an unknown chunk! */
5457                         if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
5458                                 struct sctp_gen_error_cause *cause;
5459                                 int len;
5460
5461                                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause),
5462                                     0, M_NOWAIT, 1, MT_DATA);
5463                                 if (op_err != NULL) {
5464                                         len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset));
5465                                         cause = mtod(op_err, struct sctp_gen_error_cause *);
5466                                         cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5467                                         cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause)));
5468                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5469                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
5470                                         if (SCTP_BUF_NEXT(op_err) != NULL) {
5471 #ifdef SCTP_MBUF_LOGGING
5472                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5473                                                         sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY);
5474                                                 }
5475 #endif
5476                                                 sctp_queue_op_err(stcb, op_err);
5477                                         } else {
5478                                                 sctp_m_freem(op_err);
5479                                         }
5480                                 }
5481                         }
5482                         if ((ch->chunk_type & 0x80) == 0) {
5483                                 /* discard this packet */
5484                                 *offset = length;
5485                                 return (stcb);
5486                         }       /* else skip this bad chunk and continue... */
5487                         break;
5488                 }               /* switch (ch->chunk_type) */
5489
5490
5491 next_chunk:
5492                 /* get the next chunk */
5493                 *offset += SCTP_SIZE32(chk_length);
5494                 if (*offset >= length) {
5495                         /* no more data left in the mbuf chain */
5496                         break;
5497                 }
5498                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5499                     sizeof(struct sctp_chunkhdr), chunk_buf);
5500                 if (ch == NULL) {
5501                         *offset = length;
5502                         return (stcb);
5503                 }
5504         }                       /* while */
5505
5506         if ((asconf_cnt > 0) && (stcb != NULL)) {
5507                 sctp_send_asconf_ack(stcb);
5508         }
5509         return (stcb);
5510 }
5511
5512
5513 /*
5514  * common input chunk processing (v4 and v6)
5515  */
5516 void
5517 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5518     struct sockaddr *src, struct sockaddr *dst,
5519     struct sctphdr *sh, struct sctp_chunkhdr *ch,
5520     uint8_t compute_crc,
5521     uint8_t ecn_bits,
5522     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
5523     uint32_t vrf_id, uint16_t port)
5524 {
5525         uint32_t high_tsn;
5526         int fwd_tsn_seen = 0, data_processed = 0;
5527         struct mbuf *m = *mm, *op_err;
5528         char msg[SCTP_DIAG_INFO_LEN];
5529         int un_sent;
5530         int cnt_ctrl_ready = 0;
5531         struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5532         struct sctp_tcb *stcb = NULL;
5533         struct sctp_nets *net = NULL;
5534
5535         SCTP_STAT_INCR(sctps_recvdatagrams);
5536 #ifdef SCTP_AUDITING_ENABLED
5537         sctp_audit_log(0xE0, 1);
5538         sctp_auditing(0, inp, stcb, net);
5539 #endif
5540         if (compute_crc != 0) {
5541                 uint32_t check, calc_check;
5542
5543                 check = sh->checksum;
5544                 sh->checksum = 0;
5545                 calc_check = sctp_calculate_cksum(m, iphlen);
5546                 sh->checksum = check;
5547                 if (calc_check != check) {
5548                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5549                             calc_check, check, (void *)m, length, iphlen);
5550                         stcb = sctp_findassociation_addr(m, offset, src, dst,
5551                             sh, ch, &inp, &net, vrf_id);
5552 #if defined(INET) || defined(INET6)
5553                         if ((ch->chunk_type != SCTP_INITIATION) &&
5554                             (net != NULL) && (net->port != port)) {
5555                                 if (net->port == 0) {
5556                                         /* UDP encapsulation turned on. */
5557                                         net->mtu -= sizeof(struct udphdr);
5558                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5559                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5560                                         }
5561                                 } else if (port == 0) {
5562                                         /* UDP encapsulation turned off. */
5563                                         net->mtu += sizeof(struct udphdr);
5564                                         /* XXX Update smallest_mtu */
5565                                 }
5566                                 net->port = port;
5567                         }
5568 #endif
5569                         if (net != NULL) {
5570                                 net->flowtype = mflowtype;
5571                                 net->flowid = mflowid;
5572                         }
5573                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5574                         if ((inp != NULL) && (stcb != NULL)) {
5575                                 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5576                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5577                         } else if ((inp != NULL) && (stcb == NULL)) {
5578                                 inp_decr = inp;
5579                         }
5580                         SCTP_STAT_INCR(sctps_badsum);
5581                         SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5582                         goto out;
5583                 }
5584         }
5585         /* Destination port of 0 is illegal, based on RFC4960. */
5586         if (sh->dest_port == 0) {
5587                 SCTP_STAT_INCR(sctps_hdrops);
5588                 goto out;
5589         }
5590         stcb = sctp_findassociation_addr(m, offset, src, dst,
5591             sh, ch, &inp, &net, vrf_id);
5592 #if defined(INET) || defined(INET6)
5593         if ((ch->chunk_type != SCTP_INITIATION) &&
5594             (net != NULL) && (net->port != port)) {
5595                 if (net->port == 0) {
5596                         /* UDP encapsulation turned on. */
5597                         net->mtu -= sizeof(struct udphdr);
5598                         if (stcb->asoc.smallest_mtu > net->mtu) {
5599                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5600                         }
5601                 } else if (port == 0) {
5602                         /* UDP encapsulation turned off. */
5603                         net->mtu += sizeof(struct udphdr);
5604                         /* XXX Update smallest_mtu */
5605                 }
5606                 net->port = port;
5607         }
5608 #endif
5609         if (net != NULL) {
5610                 net->flowtype = mflowtype;
5611                 net->flowid = mflowid;
5612         }
5613         if (inp == NULL) {
5614                 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5615                 SCTP_STAT_INCR(sctps_noport);
5616                 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5617                         goto out;
5618                 }
5619                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5620                         sctp_send_shutdown_complete2(src, dst, sh,
5621                             mflowtype, mflowid, fibnum,
5622                             vrf_id, port);
5623                         goto out;
5624                 }
5625                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5626                         goto out;
5627                 }
5628                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5629                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5630                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5631                             (ch->chunk_type != SCTP_INIT))) {
5632                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5633                                     "Out of the blue");
5634                                 sctp_send_abort(m, iphlen, src, dst,
5635                                     sh, 0, op_err,
5636                                     mflowtype, mflowid, fibnum,
5637                                     vrf_id, port);
5638                         }
5639                 }
5640                 goto out;
5641         } else if (stcb == NULL) {
5642                 inp_decr = inp;
5643         }
5644         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5645             (void *)m, iphlen, offset, length, (void *)stcb);
5646         if (stcb) {
5647                 /* always clear this before beginning a packet */
5648                 stcb->asoc.authenticated = 0;
5649                 stcb->asoc.seen_a_sack_this_pkt = 0;
5650                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5651                     (void *)stcb, stcb->asoc.state);
5652
5653                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5654                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5655                         /*-
5656                          * If we hit here, we had a ref count
5657                          * up when the assoc was aborted and the
5658                          * timer is clearing out the assoc, we should
5659                          * NOT respond to any packet.. its OOTB.
5660                          */
5661                         SCTP_TCB_UNLOCK(stcb);
5662                         stcb = NULL;
5663                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5664                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5665                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5666                             msg);
5667                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5668                             mflowtype, mflowid, inp->fibnum,
5669                             vrf_id, port);
5670                         goto out;
5671                 }
5672
5673         }
5674         if (IS_SCTP_CONTROL(ch)) {
5675                 /* process the control portion of the SCTP packet */
5676                 /* sa_ignore NO_NULL_CHK */
5677                 stcb = sctp_process_control(m, iphlen, &offset, length,
5678                     src, dst, sh, ch,
5679                     inp, stcb, &net, &fwd_tsn_seen,
5680                     mflowtype, mflowid, fibnum,
5681                     vrf_id, port);
5682                 if (stcb) {
5683                         /*
5684                          * This covers us if the cookie-echo was there and
5685                          * it changes our INP.
5686                          */
5687                         inp = stcb->sctp_ep;
5688 #if defined(INET) || defined(INET6)
5689                         if ((ch->chunk_type != SCTP_INITIATION) &&
5690                             (net != NULL) && (net->port != port)) {
5691                                 if (net->port == 0) {
5692                                         /* UDP encapsulation turned on. */
5693                                         net->mtu -= sizeof(struct udphdr);
5694                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5695                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5696                                         }
5697                                 } else if (port == 0) {
5698                                         /* UDP encapsulation turned off. */
5699                                         net->mtu += sizeof(struct udphdr);
5700                                         /* XXX Update smallest_mtu */
5701                                 }
5702                                 net->port = port;
5703                         }
5704 #endif
5705                 }
5706         } else {
5707                 /*
5708                  * no control chunks, so pre-process DATA chunks (these
5709                  * checks are taken care of by control processing)
5710                  */
5711
5712                 /*
5713                  * if DATA only packet, and auth is required, then punt...
5714                  * can't have authenticated without any AUTH (control)
5715                  * chunks
5716                  */
5717                 if ((stcb != NULL) &&
5718                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5719                         /* "silently" ignore */
5720                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5721                         SCTP_STAT_INCR(sctps_recvauthmissing);
5722                         goto out;
5723                 }
5724                 if (stcb == NULL) {
5725                         /* out of the blue DATA chunk */
5726                         SCTP_PROBE5(receive, NULL, NULL, m, NULL, sh);
5727                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5728                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5729                             msg);
5730                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5731                             mflowtype, mflowid, fibnum,
5732                             vrf_id, port);
5733                         goto out;
5734                 }
5735                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5736                         /* v_tag mismatch! */
5737                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5738                         SCTP_STAT_INCR(sctps_badvtag);
5739                         goto out;
5740                 }
5741         }
5742
5743         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5744         if (stcb == NULL) {
5745                 /*
5746                  * no valid TCB for this packet, or we found it's a bad
5747                  * packet while processing control, or we're done with this
5748                  * packet (done or skip rest of data), so we drop it...
5749                  */
5750                 goto out;
5751         }
5752
5753         /*
5754          * DATA chunk processing
5755          */
5756         /* plow through the data chunks while length > offset */
5757
5758         /*
5759          * Rest should be DATA only.  Check authentication state if AUTH for
5760          * DATA is required.
5761          */
5762         if ((length > offset) &&
5763             (stcb != NULL) &&
5764             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5765             !stcb->asoc.authenticated) {
5766                 /* "silently" ignore */
5767                 SCTP_STAT_INCR(sctps_recvauthmissing);
5768                 SCTPDBG(SCTP_DEBUG_AUTH1,
5769                     "Data chunk requires AUTH, skipped\n");
5770                 goto trigger_send;
5771         }
5772         if (length > offset) {
5773                 int retval;
5774
5775                 /*
5776                  * First check to make sure our state is correct. We would
5777                  * not get here unless we really did have a tag, so we don't
5778                  * abort if this happens, just dump the chunk silently.
5779                  */
5780                 switch (SCTP_GET_STATE(stcb)) {
5781                 case SCTP_STATE_COOKIE_ECHOED:
5782                         /*
5783                          * we consider data with valid tags in this state
5784                          * shows us the cookie-ack was lost. Imply it was
5785                          * there.
5786                          */
5787                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5788                         break;
5789                 case SCTP_STATE_COOKIE_WAIT:
5790                         /*
5791                          * We consider OOTB any data sent during asoc setup.
5792                          */
5793                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5794                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5795                             msg);
5796                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5797                             mflowtype, mflowid, inp->fibnum,
5798                             vrf_id, port);
5799                         goto out;
5800                         /* sa_ignore NOTREACHED */
5801                         break;
5802                 case SCTP_STATE_EMPTY:  /* should not happen */
5803                 case SCTP_STATE_INUSE:  /* should not happen */
5804                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5805                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5806                 default:
5807                         goto out;
5808                         /* sa_ignore NOTREACHED */
5809                         break;
5810                 case SCTP_STATE_OPEN:
5811                 case SCTP_STATE_SHUTDOWN_SENT:
5812                         break;
5813                 }
5814                 /* plow through the data chunks while length > offset */
5815                 retval = sctp_process_data(mm, iphlen, &offset, length,
5816                     inp, stcb, net, &high_tsn);
5817                 if (retval == 2) {
5818                         /*
5819                          * The association aborted, NO UNLOCK needed since
5820                          * the association is destroyed.
5821                          */
5822                         stcb = NULL;
5823                         goto out;
5824                 }
5825                 data_processed = 1;
5826                 /*
5827                  * Anything important needs to have been m_copy'ed in
5828                  * process_data
5829                  */
5830         }
5831
5832         /* take care of ecn */
5833         if ((data_processed == 1) &&
5834             (stcb->asoc.ecn_supported == 1) &&
5835             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5836                 /* Yep, we need to add a ECNE */
5837                 sctp_send_ecn_echo(stcb, net, high_tsn);
5838         }
5839
5840         if ((data_processed == 0) && (fwd_tsn_seen)) {
5841                 int was_a_gap;
5842                 uint32_t highest_tsn;
5843
5844                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
5845                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
5846                 } else {
5847                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
5848                 }
5849                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
5850                 stcb->asoc.send_sack = 1;
5851                 sctp_sack_check(stcb, was_a_gap);
5852         } else if (fwd_tsn_seen) {
5853                 stcb->asoc.send_sack = 1;
5854         }
5855         /* trigger send of any chunks in queue... */
5856 trigger_send:
5857 #ifdef SCTP_AUDITING_ENABLED
5858         sctp_audit_log(0xE0, 2);
5859         sctp_auditing(1, inp, stcb, net);
5860 #endif
5861         SCTPDBG(SCTP_DEBUG_INPUT1,
5862             "Check for chunk output prw:%d tqe:%d tf=%d\n",
5863             stcb->asoc.peers_rwnd,
5864             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
5865             stcb->asoc.total_flight);
5866         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
5867         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
5868                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
5869         }
5870         if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) ||
5871             cnt_ctrl_ready ||
5872             stcb->asoc.trigger_reset ||
5873             ((un_sent) &&
5874             (stcb->asoc.peers_rwnd > 0 ||
5875             (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
5876                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
5877                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5878                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
5879         }
5880 #ifdef SCTP_AUDITING_ENABLED
5881         sctp_audit_log(0xE0, 3);
5882         sctp_auditing(2, inp, stcb, net);
5883 #endif
5884 out:
5885         if (stcb != NULL) {
5886                 SCTP_TCB_UNLOCK(stcb);
5887         }
5888         if (inp_decr != NULL) {
5889                 /* reduce ref-count */
5890                 SCTP_INP_WLOCK(inp_decr);
5891                 SCTP_INP_DECR_REF(inp_decr);
5892                 SCTP_INP_WUNLOCK(inp_decr);
5893         }
5894         return;
5895 }
5896
5897 #ifdef INET
5898 void
5899 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
5900 {
5901         struct mbuf *m;
5902         int iphlen;
5903         uint32_t vrf_id = 0;
5904         uint8_t ecn_bits;
5905         struct sockaddr_in src, dst;
5906         struct ip *ip;
5907         struct sctphdr *sh;
5908         struct sctp_chunkhdr *ch;
5909         int length, offset;
5910         uint8_t compute_crc;
5911         uint32_t mflowid;
5912         uint8_t mflowtype;
5913         uint16_t fibnum;
5914
5915         iphlen = off;
5916         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
5917                 SCTP_RELEASE_PKT(i_pak);
5918                 return;
5919         }
5920         m = SCTP_HEADER_TO_CHAIN(i_pak);
5921 #ifdef SCTP_MBUF_LOGGING
5922         /* Log in any input mbufs */
5923         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5924                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
5925         }
5926 #endif
5927 #ifdef SCTP_PACKET_LOGGING
5928         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
5929                 sctp_packet_log(m);
5930         }
5931 #endif
5932         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
5933             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
5934             m->m_pkthdr.len,
5935             if_name(m->m_pkthdr.rcvif),
5936             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
5937         mflowid = m->m_pkthdr.flowid;
5938         mflowtype = M_HASHTYPE_GET(m);
5939         fibnum = M_GETFIB(m);
5940         SCTP_STAT_INCR(sctps_recvpackets);
5941         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
5942         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
5943         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5944         if (SCTP_BUF_LEN(m) < offset) {
5945                 if ((m = m_pullup(m, offset)) == NULL) {
5946                         SCTP_STAT_INCR(sctps_hdrops);
5947                         return;
5948                 }
5949         }
5950         ip = mtod(m, struct ip *);
5951         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
5952         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
5953         offset -= sizeof(struct sctp_chunkhdr);
5954         memset(&src, 0, sizeof(struct sockaddr_in));
5955         src.sin_family = AF_INET;
5956         src.sin_len = sizeof(struct sockaddr_in);
5957         src.sin_port = sh->src_port;
5958         src.sin_addr = ip->ip_src;
5959         memset(&dst, 0, sizeof(struct sockaddr_in));
5960         dst.sin_family = AF_INET;
5961         dst.sin_len = sizeof(struct sockaddr_in);
5962         dst.sin_port = sh->dest_port;
5963         dst.sin_addr = ip->ip_dst;
5964         length = ntohs(ip->ip_len);
5965         /* Validate mbuf chain length with IP payload length. */
5966         if (SCTP_HEADER_LEN(m) != length) {
5967                 SCTPDBG(SCTP_DEBUG_INPUT1,
5968                     "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
5969                 SCTP_STAT_INCR(sctps_hdrops);
5970                 goto out;
5971         }
5972         /* SCTP does not allow broadcasts or multicasts */
5973         if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
5974                 goto out;
5975         }
5976         if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
5977                 goto out;
5978         }
5979         ecn_bits = ip->ip_tos;
5980         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
5981                 SCTP_STAT_INCR(sctps_recvhwcrc);
5982                 compute_crc = 0;
5983         } else {
5984                 SCTP_STAT_INCR(sctps_recvswcrc);
5985                 compute_crc = 1;
5986         }
5987         sctp_common_input_processing(&m, iphlen, offset, length,
5988             (struct sockaddr *)&src,
5989             (struct sockaddr *)&dst,
5990             sh, ch,
5991             compute_crc,
5992             ecn_bits,
5993             mflowtype, mflowid, fibnum,
5994             vrf_id, port);
5995 out:
5996         if (m) {
5997                 sctp_m_freem(m);
5998         }
5999         return;
6000 }
6001
6002 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6003 extern int *sctp_cpuarry;
6004 #endif
6005
6006 int
6007 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED)
6008 {
6009         struct mbuf *m;
6010         int off;
6011
6012         m = *mp;
6013         off = *offp;
6014 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6015         if (mp_ncpus > 1) {
6016                 struct ip *ip;
6017                 struct sctphdr *sh;
6018                 int offset;
6019                 int cpu_to_use;
6020                 uint32_t flowid, tag;
6021
6022                 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
6023                         flowid = m->m_pkthdr.flowid;
6024                 } else {
6025                         /*
6026                          * No flow id built by lower layers fix it so we
6027                          * create one.
6028                          */
6029                         offset = off + sizeof(struct sctphdr);
6030                         if (SCTP_BUF_LEN(m) < offset) {
6031                                 if ((m = m_pullup(m, offset)) == NULL) {
6032                                         SCTP_STAT_INCR(sctps_hdrops);
6033                                         return (IPPROTO_DONE);
6034                                 }
6035                         }
6036                         ip = mtod(m, struct ip *);
6037                         sh = (struct sctphdr *)((caddr_t)ip + off);
6038                         tag = htonl(sh->v_tag);
6039                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
6040                         m->m_pkthdr.flowid = flowid;
6041                         M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH);
6042                 }
6043                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
6044                 sctp_queue_to_mcore(m, off, cpu_to_use);
6045                 return (IPPROTO_DONE);
6046         }
6047 #endif
6048         sctp_input_with_port(m, off, 0);
6049         return (IPPROTO_DONE);
6050 }
6051 #endif