sys/netinet/sctp_input.c

   1 /*-
   2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * a) Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  *
  12  * b) Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the distribution.
  15  *
  16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <netinet/sctp_os.h>
  37 #include <netinet/sctp_var.h>
  38 #include <netinet/sctp_sysctl.h>
  39 #include <netinet/sctp_pcb.h>
  40 #include <netinet/sctp_header.h>
  41 #include <netinet/sctputil.h>
  42 #include <netinet/sctp_output.h>
  43 #include <netinet/sctp_input.h>
  44 #include <netinet/sctp_auth.h>
  45 #include <netinet/sctp_indata.h>
  46 #include <netinet/sctp_asconf.h>
  47 #include <netinet/sctp_bsd_addr.h>
  48 #include <netinet/sctp_timer.h>
  49 #include <netinet/sctp_crc32.h>
  50 #if defined(INET) || defined(INET6)
  51 #include <netinet/udp.h>
  52 #endif
  53 #include <sys/smp.h>
  54
  55
  56
  57 static void
  58 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb)
  59 {
  60         struct sctp_nets *net;
  61
  62         /*
  63          * This now not only stops all cookie timers it also stops any INIT
  64          * timers as well. This will make sure that the timers are stopped
  65          * in all collision cases.
  66          */
  67         SCTP_TCB_LOCK_ASSERT(stcb);
  68         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
  69                 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) {
  70                         sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE,
  71                             stcb->sctp_ep,
  72                             stcb,
  73                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1);
  74                 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) {
  75                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT,
  76                             stcb->sctp_ep,
  77                             stcb,
  78                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2);
  79                 }
  80         }
  81 }
  82
  83 /* INIT handler */
  84 static void
  85 sctp_handle_init(struct mbuf *m, int iphlen, int offset,
  86     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
  87     struct sctp_init_chunk *cp, struct sctp_inpcb *inp,
  88     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_no_unlock,
  89     uint8_t mflowtype, uint32_t mflowid,
  90     uint32_t vrf_id, uint16_t port)
  91 {
  92         struct sctp_init *init;
  93         struct mbuf *op_err;
  94
  95         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
  96             (void *)stcb);
  97         if (stcb == NULL) {
  98                 SCTP_INP_RLOCK(inp);
  99         }
 100         /* validate length */
 101         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) {
 102                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 103                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 104                     mflowtype, mflowid,
 105                     vrf_id, port);
 106                 if (stcb)
 107                         *abort_no_unlock = 1;
 108                 goto outnow;
 109         }
 110         /* validate parameters */
 111         init = &cp->init;
 112         if (init->initiate_tag == 0) {
 113                 /* protocol error... send abort */
 114                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 115                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 116                     mflowtype, mflowid,
 117                     vrf_id, port);
 118                 if (stcb)
 119                         *abort_no_unlock = 1;
 120                 goto outnow;
 121         }
 122         if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) {
 123                 /* invalid parameter... send abort */
 124                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 125                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 126                     mflowtype, mflowid,
 127                     vrf_id, port);
 128                 if (stcb)
 129                         *abort_no_unlock = 1;
 130                 goto outnow;
 131         }
 132         if (init->num_inbound_streams == 0) {
 133                 /* protocol error... send abort */
 134                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 135                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 136                     mflowtype, mflowid,
 137                     vrf_id, port);
 138                 if (stcb)
 139                         *abort_no_unlock = 1;
 140                 goto outnow;
 141         }
 142         if (init->num_outbound_streams == 0) {
 143                 /* protocol error... send abort */
 144                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 145                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 146                     mflowtype, mflowid,
 147                     vrf_id, port);
 148                 if (stcb)
 149                         *abort_no_unlock = 1;
 150                 goto outnow;
 151         }
 152         if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
 153             offset + ntohs(cp->ch.chunk_length))) {
 154                 /* auth parameter(s) error... send abort */
 155                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 156                     "Problem with AUTH parameters");
 157                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 158                     mflowtype, mflowid,
 159                     vrf_id, port);
 160                 if (stcb)
 161                         *abort_no_unlock = 1;
 162                 goto outnow;
 163         }
 164         /* We are only accepting if we have a listening socket. */
 165         if ((stcb == NULL) &&
 166             ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
 167             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
 168             (!SCTP_IS_LISTENING(inp)))) {
 169                 /*
 170                  * FIX ME ?? What about TCP model and we have a
 171                  * match/restart case? Actually no fix is needed. the lookup
 172                  * will always find the existing assoc so stcb would not be
 173                  * NULL. It may be questionable to do this since we COULD
 174                  * just send back the INIT-ACK and hope that the app did
 175                  * accept()'s by the time the COOKIE was sent. But there is
 176                  * a price to pay for COOKIE generation and I don't want to
 177                  * pay it on the chance that the app will actually do some
 178                  * accepts(). The App just looses and should NOT be in this
 179                  * state :-)
 180                  */
 181                 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) {
 182                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 183                             "No listener");
 184                         sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
 185                             mflowtype, mflowid, inp->fibnum,
 186                             vrf_id, port);
 187                 }
 188                 goto outnow;
 189         }
 190         if ((stcb != NULL) &&
 191             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 192                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n");
 193                 sctp_send_shutdown_ack(stcb, NULL);
 194                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
 195         } else {
 196                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
 197                 sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset,
 198                     src, dst, sh, cp,
 199                     mflowtype, mflowid,
 200                     vrf_id, port);
 201         }
 202 outnow:
 203         if (stcb == NULL) {
 204                 SCTP_INP_RUNLOCK(inp);
 205         }
 206 }
 207
 208 /*
 209  * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
 210  */
 211
 212 int
 213 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked
 214 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 215     SCTP_UNUSED
 216 #endif
 217 )
 218 {
 219         int unsent_data;
 220         unsigned int i;
 221         struct sctp_stream_queue_pending *sp;
 222         struct sctp_association *asoc;
 223
 224         /*
 225          * This function returns if any stream has true unsent data on it.
 226          * Note that as it looks through it will clean up any places that
 227          * have old data that has been sent but left at top of stream queue.
 228          */
 229         asoc = &stcb->asoc;
 230         unsent_data = 0;
 231         SCTP_TCB_SEND_LOCK(stcb);
 232         if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
 233                 /* Check to see if some data queued */
 234                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 235                         /* sa_ignore FREED_MEMORY */
 236                         sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
 237                         if (sp == NULL) {
 238                                 continue;
 239                         }
 240                         if ((sp->msg_is_complete) &&
 241                             (sp->length == 0) &&
 242                             (sp->sender_all_done)) {
 243                                 /*
 244                                  * We are doing differed cleanup. Last time
 245                                  * through when we took all the data the
 246                                  * sender_all_done was not set.
 247                                  */
 248                                 if (sp->put_last_out == 0) {
 249                                         SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
 250                                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
 251                                             sp->sender_all_done,
 252                                             sp->length,
 253                                             sp->msg_is_complete,
 254                                             sp->put_last_out);
 255                                 }
 256                                 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 257                                 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
 258                                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp, 1);
 259                                 if (sp->net) {
 260                                         sctp_free_remote_addr(sp->net);
 261                                         sp->net = NULL;
 262                                 }
 263                                 if (sp->data) {
 264                                         sctp_m_freem(sp->data);
 265                                         sp->data = NULL;
 266                                 }
 267                                 sctp_free_a_strmoq(stcb, sp, so_locked);
 268                                 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
 269                                         unsent_data++;
 270                                 }
 271                         } else {
 272                                 unsent_data++;
 273                         }
 274                         if (unsent_data > 0) {
 275                                 break;
 276                         }
 277                 }
 278         }
 279         SCTP_TCB_SEND_UNLOCK(stcb);
 280         return (unsent_data);
 281 }
 282
 283 static int
 284 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb)
 285 {
 286         struct sctp_init *init;
 287         struct sctp_association *asoc;
 288         struct sctp_nets *lnet;
 289         unsigned int i;
 290
 291         init = &cp->init;
 292         asoc = &stcb->asoc;
 293         /* save off parameters */
 294         asoc->peer_vtag = ntohl(init->initiate_tag);
 295         asoc->peers_rwnd = ntohl(init->a_rwnd);
 296         /* init tsn's */
 297         asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
 298
 299         if (!TAILQ_EMPTY(&asoc->nets)) {
 300                 /* update any ssthresh's that may have a default */
 301                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
 302                         lnet->ssthresh = asoc->peers_rwnd;
 303                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
 304                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
 305                         }
 306                 }
 307         }
 308         SCTP_TCB_SEND_LOCK(stcb);
 309         if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
 310                 unsigned int newcnt;
 311                 struct sctp_stream_out *outs;
 312                 struct sctp_stream_queue_pending *sp, *nsp;
 313                 struct sctp_tmit_chunk *chk, *nchk;
 314
 315                 /* abandon the upper streams */
 316                 newcnt = ntohs(init->num_inbound_streams);
 317                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
 318                         if (chk->rec.data.sid >= newcnt) {
 319                                 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
 320                                 asoc->send_queue_cnt--;
 321                                 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) {
 322                                         asoc->strmout[chk->rec.data.sid].chunks_on_queues--;
 323 #ifdef INVARIANTS
 324                                 } else {
 325                                         panic("No chunks on the queues for sid %u.", chk->rec.data.sid);
 326 #endif
 327                                 }
 328                                 if (chk->data != NULL) {
 329                                         sctp_free_bufspace(stcb, asoc, chk, 1);
 330                                         sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb,
 331                                             0, chk, SCTP_SO_NOT_LOCKED);
 332                                         if (chk->data) {
 333                                                 sctp_m_freem(chk->data);
 334                                                 chk->data = NULL;
 335                                         }
 336                                 }
 337                                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 338                                 /* sa_ignore FREED_MEMORY */
 339                         }
 340                 }
 341                 if (asoc->strmout) {
 342                         for (i = newcnt; i < asoc->pre_open_streams; i++) {
 343                                 outs = &asoc->strmout[i];
 344                                 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
 345                                         atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 346                                         TAILQ_REMOVE(&outs->outqueue, sp, next);
 347                                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp, 1);
 348                                         sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
 349                                             stcb, 0, sp, SCTP_SO_NOT_LOCKED);
 350                                         if (sp->data) {
 351                                                 sctp_m_freem(sp->data);
 352                                                 sp->data = NULL;
 353                                         }
 354                                         if (sp->net) {
 355                                                 sctp_free_remote_addr(sp->net);
 356                                                 sp->net = NULL;
 357                                         }
 358                                         /* Free the chunk */
 359                                         sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
 360                                         /* sa_ignore FREED_MEMORY */
 361                                 }
 362                                 outs->state = SCTP_STREAM_CLOSED;
 363                         }
 364                 }
 365                 /* cut back the count */
 366                 asoc->pre_open_streams = newcnt;
 367         }
 368         SCTP_TCB_SEND_UNLOCK(stcb);
 369         asoc->streamoutcnt = asoc->pre_open_streams;
 370         if (asoc->strmout) {
 371                 for (i = 0; i < asoc->streamoutcnt; i++) {
 372                         asoc->strmout[i].state = SCTP_STREAM_OPEN;
 373                 }
 374         }
 375         /* EY - nr_sack: initialize highest tsn in nr_mapping_array */
 376         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
 377         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
 378                 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 379         }
 380         /* This is the next one we expect */
 381         asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
 382
 383         asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
 384         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
 385
 386         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
 387         /* open the requested streams */
 388
 389         if (asoc->strmin != NULL) {
 390                 /* Free the old ones */
 391                 for (i = 0; i < asoc->streamincnt; i++) {
 392                         sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue);
 393                         sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue);
 394                 }
 395                 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
 396         }
 397         if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) {
 398                 asoc->streamincnt = ntohs(init->num_outbound_streams);
 399         } else {
 400                 asoc->streamincnt = asoc->max_inbound_streams;
 401         }
 402         SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
 403             sizeof(struct sctp_stream_in), SCTP_M_STRMI);
 404         if (asoc->strmin == NULL) {
 405                 /* we didn't get memory for the streams! */
 406                 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
 407                 return (-1);
 408         }
 409         for (i = 0; i < asoc->streamincnt; i++) {
 410                 asoc->strmin[i].sid = i;
 411                 asoc->strmin[i].last_mid_delivered = 0xffffffff;
 412                 TAILQ_INIT(&asoc->strmin[i].inqueue);
 413                 TAILQ_INIT(&asoc->strmin[i].uno_inqueue);
 414                 asoc->strmin[i].pd_api_started = 0;
 415                 asoc->strmin[i].delivery_started = 0;
 416         }
 417         /*
 418          * load_address_from_init will put the addresses into the
 419          * association when the COOKIE is processed or the INIT-ACK is
 420          * processed. Both types of COOKIE's existing and new call this
 421          * routine. It will remove addresses that are no longer in the
 422          * association (for the restarting case where addresses are
 423          * removed). Up front when the INIT arrives we will discard it if it
 424          * is a restart and new addresses have been added.
 425          */
 426         /* sa_ignore MEMLEAK */
 427         return (0);
 428 }
 429
 430 /*
 431  * INIT-ACK message processing/consumption returns value < 0 on error
 432  */
 433 static int
 434 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
 435     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
 436     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
 437     struct sctp_nets *net, int *abort_no_unlock,
 438     uint8_t mflowtype, uint32_t mflowid,
 439     uint32_t vrf_id)
 440 {
 441         struct sctp_association *asoc;
 442         struct mbuf *op_err;
 443         int retval, abort_flag;
 444         uint32_t initack_limit;
 445         int nat_friendly = 0;
 446
 447         /* First verify that we have no illegal param's */
 448         abort_flag = 0;
 449
 450         op_err = sctp_arethere_unrecognized_parameters(m,
 451             (offset + sizeof(struct sctp_init_chunk)),
 452             &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly);
 453         if (abort_flag) {
 454                 /* Send an abort and notify peer */
 455                 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
 456                 *abort_no_unlock = 1;
 457                 return (-1);
 458         }
 459         asoc = &stcb->asoc;
 460         asoc->peer_supports_nat = (uint8_t)nat_friendly;
 461         /* process the peer's parameters in the INIT-ACK */
 462         retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb);
 463         if (retval < 0) {
 464                 return (retval);
 465         }
 466         initack_limit = offset + ntohs(cp->ch.chunk_length);
 467         /* load all addresses */
 468         if ((retval = sctp_load_addresses_from_init(stcb, m,
 469             (offset + sizeof(struct sctp_init_chunk)), initack_limit,
 470             src, dst, NULL, stcb->asoc.port))) {
 471                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 472                     "Problem with address parameters");
 473                 SCTPDBG(SCTP_DEBUG_INPUT1,
 474                     "Load addresses from INIT causes an abort %d\n",
 475                     retval);
 476                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 477                     src, dst, sh, op_err,
 478                     mflowtype, mflowid,
 479                     vrf_id, net->port);
 480                 *abort_no_unlock = 1;
 481                 return (-1);
 482         }
 483         /* if the peer doesn't support asconf, flush the asconf queue */
 484         if (asoc->asconf_supported == 0) {
 485                 struct sctp_asconf_addr *param, *nparam;
 486
 487                 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
 488                         TAILQ_REMOVE(&asoc->asconf_queue, param, next);
 489                         SCTP_FREE(param, SCTP_M_ASC_ADDR);
 490                 }
 491         }
 492         stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
 493             stcb->asoc.local_hmacs);
 494         if (op_err) {
 495                 sctp_queue_op_err(stcb, op_err);
 496                 /* queuing will steal away the mbuf chain to the out queue */
 497                 op_err = NULL;
 498         }
 499         /* extract the cookie and queue it to "echo" it back... */
 500         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 501                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 502                     stcb->asoc.overall_error_count,
 503                     0,
 504                     SCTP_FROM_SCTP_INPUT,
 505                     __LINE__);
 506         }
 507         stcb->asoc.overall_error_count = 0;
 508         net->error_count = 0;
 509
 510         /*
 511          * Cancel the INIT timer, We do this first before queueing the
 512          * cookie. We always cancel at the primary to assue that we are
 513          * canceling the timer started by the INIT which always goes to the
 514          * primary.
 515          */
 516         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
 517             asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 518
 519         /* calculate the RTO */
 520         net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy,
 521             SCTP_RTT_FROM_NON_DATA);
 522         retval = sctp_send_cookie_echo(m, offset, stcb, net);
 523         if (retval < 0) {
 524                 /*
 525                  * No cookie, we probably should send a op error. But in any
 526                  * case if there is no cookie in the INIT-ACK, we can
 527                  * abandon the peer, its broke.
 528                  */
 529                 if (retval == -3) {
 530                         uint16_t len;
 531
 532                         len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t));
 533                         /* We abort with an error of missing mandatory param */
 534                         op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA);
 535                         if (op_err != NULL) {
 536                                 struct sctp_error_missing_param *cause;
 537
 538                                 SCTP_BUF_LEN(op_err) = len;
 539                                 cause = mtod(op_err, struct sctp_error_missing_param *);
 540                                 /* Subtract the reserved param */
 541                                 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM);
 542                                 cause->cause.length = htons(len);
 543                                 cause->num_missing_params = htonl(1);
 544                                 cause->type[0] = htons(SCTP_STATE_COOKIE);
 545                         }
 546                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 547                             src, dst, sh, op_err,
 548                             mflowtype, mflowid,
 549                             vrf_id, net->port);
 550                         *abort_no_unlock = 1;
 551                 }
 552                 return (retval);
 553         }
 554         return (0);
 555 }
 556
 557 static void
 558 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
 559     struct sctp_tcb *stcb, struct sctp_nets *net)
 560 {
 561         union sctp_sockstore store;
 562         struct sctp_nets *r_net, *f_net;
 563         struct timeval tv;
 564         int req_prim = 0;
 565         uint16_t old_error_counter;
 566
 567         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
 568                 /* Invalid length */
 569                 return;
 570         }
 571         memset(&store, 0, sizeof(store));
 572         switch (cp->heartbeat.hb_info.addr_family) {
 573 #ifdef INET
 574         case AF_INET:
 575                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
 576                         store.sin.sin_family = cp->heartbeat.hb_info.addr_family;
 577                         store.sin.sin_len = cp->heartbeat.hb_info.addr_len;
 578                         store.sin.sin_port = stcb->rport;
 579                         memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address,
 580                             sizeof(store.sin.sin_addr));
 581                 } else {
 582                         return;
 583                 }
 584                 break;
 585 #endif
 586 #ifdef INET6
 587         case AF_INET6:
 588                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
 589                         store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family;
 590                         store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len;
 591                         store.sin6.sin6_port = stcb->rport;
 592                         memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr));
 593                 } else {
 594                         return;
 595                 }
 596                 break;
 597 #endif
 598         default:
 599                 return;
 600         }
 601         r_net = sctp_findnet(stcb, &store.sa);
 602         if (r_net == NULL) {
 603                 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
 604                 return;
 605         }
 606         if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 607             (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
 608             (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
 609                 /*
 610                  * If the its a HB and it's random value is correct when can
 611                  * confirm the destination.
 612                  */
 613                 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 614                 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
 615                         stcb->asoc.primary_destination = r_net;
 616                         r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
 617                         f_net = TAILQ_FIRST(&stcb->asoc.nets);
 618                         if (f_net != r_net) {
 619                                 /*
 620                                  * first one on the list is NOT the primary
 621                                  * sctp_cmpaddr() is much more efficient if
 622                                  * the primary is the first on the list,
 623                                  * make it so.
 624                                  */
 625                                 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
 626                                 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
 627                         }
 628                         req_prim = 1;
 629                 }
 630                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 631                     stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 632                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb,
 633                     r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
 634                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 635         }
 636         old_error_counter = r_net->error_count;
 637         r_net->error_count = 0;
 638         r_net->hb_responded = 1;
 639         tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
 640         tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
 641         /* Now lets do a RTO with this */
 642         r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy,
 643             SCTP_RTT_FROM_NON_DATA);
 644         if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
 645                 r_net->dest_state |= SCTP_ADDR_REACHABLE;
 646                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
 647                     0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 648         }
 649         if (r_net->dest_state & SCTP_ADDR_PF) {
 650                 r_net->dest_state &= ~SCTP_ADDR_PF;
 651                 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
 652         }
 653         if (old_error_counter > 0) {
 654                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
 655                     stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5);
 656                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 657         }
 658         if (r_net == stcb->asoc.primary_destination) {
 659                 if (stcb->asoc.alternate) {
 660                         /* release the alternate, primary is good */
 661                         sctp_free_remote_addr(stcb->asoc.alternate);
 662                         stcb->asoc.alternate = NULL;
 663                 }
 664         }
 665         /* Mobility adaptation */
 666         if (req_prim) {
 667                 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
 668                     SCTP_MOBILITY_BASE) ||
 669                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 670                     SCTP_MOBILITY_FASTHANDOFF)) &&
 671                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 672                     SCTP_MOBILITY_PRIM_DELETED)) {
 673
 674                         sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED,
 675                             stcb->sctp_ep, stcb, NULL,
 676                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 677                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 678                             SCTP_MOBILITY_FASTHANDOFF)) {
 679                                 sctp_assoc_immediate_retrans(stcb,
 680                                     stcb->asoc.primary_destination);
 681                         }
 682                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 683                             SCTP_MOBILITY_BASE)) {
 684                                 sctp_move_chunks_from_net(stcb,
 685                                     stcb->asoc.deleted_primary);
 686                         }
 687                         sctp_delete_prim_timer(stcb->sctp_ep, stcb,
 688                             stcb->asoc.deleted_primary);
 689                 }
 690         }
 691 }
 692
 693 static int
 694 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
 695 {
 696         /*
 697          * return 0 means we want you to proceed with the abort non-zero
 698          * means no abort processing
 699          */
 700         struct sctpasochead *head;
 701
 702         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) ||
 703             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 704                 atomic_add_int(&stcb->asoc.refcnt, 1);
 705                 SCTP_TCB_UNLOCK(stcb);
 706                 SCTP_INP_INFO_WLOCK();
 707                 SCTP_TCB_LOCK(stcb);
 708                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 709         }
 710         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) {
 711                 /* generate a new vtag and send init */
 712                 LIST_REMOVE(stcb, sctp_asocs);
 713                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 714                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 715                 /*
 716                  * put it in the bucket in the vtag hash of assoc's for the
 717                  * system
 718                  */
 719                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 720                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 721                 SCTP_INP_INFO_WUNLOCK();
 722                 return (1);
 723         }
 724         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
 725                 /*
 726                  * treat like a case where the cookie expired i.e.: - dump
 727                  * current cookie. - generate a new vtag. - resend init.
 728                  */
 729                 /* generate a new vtag and send init */
 730                 LIST_REMOVE(stcb, sctp_asocs);
 731                 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED;
 732                 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT;
 733                 sctp_stop_all_cookie_timers(stcb);
 734                 sctp_toss_old_cookies(stcb, &stcb->asoc);
 735                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 736                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 737                 /*
 738                  * put it in the bucket in the vtag hash of assoc's for the
 739                  * system
 740                  */
 741                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 742                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 743                 SCTP_INP_INFO_WUNLOCK();
 744                 return (1);
 745         }
 746         return (0);
 747 }
 748
 749 static int
 750 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
 751     struct sctp_nets *net)
 752 {
 753         /*
 754          * return 0 means we want you to proceed with the abort non-zero
 755          * means no abort processing
 756          */
 757         if (stcb->asoc.auth_supported == 0) {
 758                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
 759                 return (0);
 760         }
 761         sctp_asconf_send_nat_state_update(stcb, net);
 762         return (1);
 763 }
 764
 765
 766 static void
 767 sctp_handle_abort(struct sctp_abort_chunk *abort,
 768     struct sctp_tcb *stcb, struct sctp_nets *net)
 769 {
 770 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 771         struct socket *so;
 772 #endif
 773         uint16_t len;
 774         uint16_t error;
 775
 776         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
 777         if (stcb == NULL)
 778                 return;
 779
 780         len = ntohs(abort->ch.chunk_length);
 781         if (len > sizeof(struct sctp_chunkhdr)) {
 782                 /*
 783                  * Need to check the cause codes for our two magic nat
 784                  * aborts which don't kill the assoc necessarily.
 785                  */
 786                 struct sctp_gen_error_cause *cause;
 787
 788                 cause = (struct sctp_gen_error_cause *)(abort + 1);
 789                 error = ntohs(cause->code);
 790                 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) {
 791                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
 792                             abort->ch.chunk_flags);
 793                         if (sctp_handle_nat_colliding_state(stcb)) {
 794                                 return;
 795                         }
 796                 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) {
 797                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
 798                             abort->ch.chunk_flags);
 799                         if (sctp_handle_nat_missing_state(stcb, net)) {
 800                                 return;
 801                         }
 802                 }
 803         } else {
 804                 error = 0;
 805         }
 806         /* stop any receive timers */
 807         sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net,
 808             SCTP_FROM_SCTP_INPUT + SCTP_LOC_7);
 809         /* notify user of the abort and clean up... */
 810         sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED);
 811         /* free the tcb */
 812         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
 813         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) ||
 814             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 815                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 816         }
 817 #ifdef SCTP_ASOCLOG_OF_TSNS
 818         sctp_print_out_track_log(stcb);
 819 #endif
 820 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 821         so = SCTP_INP_SO(stcb->sctp_ep);
 822         atomic_add_int(&stcb->asoc.refcnt, 1);
 823         SCTP_TCB_UNLOCK(stcb);
 824         SCTP_SOCKET_LOCK(so, 1);
 825         SCTP_TCB_LOCK(stcb);
 826         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 827 #endif
 828         stcb->asoc.state |= SCTP_STATE_WAS_ABORTED;
 829         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 830             SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
 831 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 832         SCTP_SOCKET_UNLOCK(so, 1);
 833 #endif
 834         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
 835 }
 836
 837 static void
 838 sctp_start_net_timers(struct sctp_tcb *stcb)
 839 {
 840         uint32_t cnt_hb_sent;
 841         struct sctp_nets *net;
 842
 843         cnt_hb_sent = 0;
 844         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 845                 /*
 846                  * For each network start: 1) A pmtu timer. 2) A HB timer 3)
 847                  * If the dest in unconfirmed send a hb as well if under
 848                  * max_hb_burst have been sent.
 849                  */
 850                 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
 851                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
 852                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
 853                     (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
 854                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 855                         cnt_hb_sent++;
 856                 }
 857         }
 858         if (cnt_hb_sent) {
 859                 sctp_chunk_output(stcb->sctp_ep, stcb,
 860                     SCTP_OUTPUT_FROM_COOKIE_ACK,
 861                     SCTP_SO_NOT_LOCKED);
 862         }
 863 }
 864
 865
 866 static void
 867 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
 868     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
 869 {
 870         struct sctp_association *asoc;
 871         int some_on_streamwheel;
 872         int old_state;
 873 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 874         struct socket *so;
 875 #endif
 876
 877         SCTPDBG(SCTP_DEBUG_INPUT2,
 878             "sctp_handle_shutdown: handling SHUTDOWN\n");
 879         if (stcb == NULL)
 880                 return;
 881         asoc = &stcb->asoc;
 882         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 883             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 884                 return;
 885         }
 886         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
 887                 /* Shutdown NOT the expected size */
 888                 return;
 889         }
 890         old_state = SCTP_GET_STATE(asoc);
 891         sctp_update_acked(stcb, cp, abort_flag);
 892         if (*abort_flag) {
 893                 return;
 894         }
 895         if (asoc->control_pdapi) {
 896                 /*
 897                  * With a normal shutdown we assume the end of last record.
 898                  */
 899                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 900                 if (asoc->control_pdapi->on_strm_q) {
 901                         struct sctp_stream_in *strm;
 902
 903                         strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream];
 904                         if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) {
 905                                 /* Unordered */
 906                                 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm);
 907                                 asoc->control_pdapi->on_strm_q = 0;
 908                         } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) {
 909                                 /* Ordered */
 910                                 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm);
 911                                 asoc->control_pdapi->on_strm_q = 0;
 912 #ifdef INVARIANTS
 913                         } else {
 914                                 panic("Unknown state on ctrl:%p on_strm_q:%d",
 915                                     asoc->control_pdapi,
 916                                     asoc->control_pdapi->on_strm_q);
 917 #endif
 918                         }
 919                 }
 920                 asoc->control_pdapi->end_added = 1;
 921                 asoc->control_pdapi->pdapi_aborted = 1;
 922                 asoc->control_pdapi = NULL;
 923                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 924 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 925                 so = SCTP_INP_SO(stcb->sctp_ep);
 926                 atomic_add_int(&stcb->asoc.refcnt, 1);
 927                 SCTP_TCB_UNLOCK(stcb);
 928                 SCTP_SOCKET_LOCK(so, 1);
 929                 SCTP_TCB_LOCK(stcb);
 930                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 931                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 932                         /* assoc was freed while we were unlocked */
 933                         SCTP_SOCKET_UNLOCK(so, 1);
 934                         return;
 935                 }
 936 #endif
 937                 if (stcb->sctp_socket) {
 938                         sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 939                 }
 940 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 941                 SCTP_SOCKET_UNLOCK(so, 1);
 942 #endif
 943         }
 944         /* goto SHUTDOWN_RECEIVED state to block new requests */
 945         if (stcb->sctp_socket) {
 946                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 947                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
 948                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
 949                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED);
 950                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 951                         /*
 952                          * notify upper layer that peer has initiated a
 953                          * shutdown
 954                          */
 955                         sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 956
 957                         /* reset time */
 958                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
 959                 }
 960         }
 961         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
 962                 /*
 963                  * stop the shutdown timer, since we WILL move to
 964                  * SHUTDOWN-ACK-SENT.
 965                  */
 966                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
 967                     net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
 968         }
 969         /* Now is there unsent data on a stream somewhere? */
 970         some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
 971
 972         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 973             !TAILQ_EMPTY(&asoc->sent_queue) ||
 974             some_on_streamwheel) {
 975                 /* By returning we will push more data out */
 976                 return;
 977         } else {
 978                 /* no outstanding data to send, so move on... */
 979                 /* send SHUTDOWN-ACK */
 980                 /* move to SHUTDOWN-ACK-SENT state */
 981                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
 982                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 983                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 984                 }
 985                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 986                 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
 987                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
 988                         sctp_stop_timers_for_shutdown(stcb);
 989                         sctp_send_shutdown_ack(stcb, net);
 990                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
 991                             stcb->sctp_ep, stcb, net);
 992                 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) {
 993                         sctp_send_shutdown_ack(stcb, net);
 994                 }
 995         }
 996 }
 997
 998 static void
 999 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
1000     struct sctp_tcb *stcb,
1001     struct sctp_nets *net)
1002 {
1003         struct sctp_association *asoc;
1004 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1005         struct socket *so;
1006
1007         so = SCTP_INP_SO(stcb->sctp_ep);
1008 #endif
1009         SCTPDBG(SCTP_DEBUG_INPUT2,
1010             "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
1011         if (stcb == NULL)
1012                 return;
1013
1014         asoc = &stcb->asoc;
1015         /* process according to association state */
1016         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
1017             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
1018                 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
1019                 sctp_send_shutdown_complete(stcb, net, 1);
1020                 SCTP_TCB_UNLOCK(stcb);
1021                 return;
1022         }
1023         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
1024             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
1025                 /* unexpected SHUTDOWN-ACK... so ignore... */
1026                 SCTP_TCB_UNLOCK(stcb);
1027                 return;
1028         }
1029         if (asoc->control_pdapi) {
1030                 /*
1031                  * With a normal shutdown we assume the end of last record.
1032                  */
1033                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
1034                 asoc->control_pdapi->end_added = 1;
1035                 asoc->control_pdapi->pdapi_aborted = 1;
1036                 asoc->control_pdapi = NULL;
1037                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
1038 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1039                 atomic_add_int(&stcb->asoc.refcnt, 1);
1040                 SCTP_TCB_UNLOCK(stcb);
1041                 SCTP_SOCKET_LOCK(so, 1);
1042                 SCTP_TCB_LOCK(stcb);
1043                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1044                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1045                         /* assoc was freed while we were unlocked */
1046                         SCTP_SOCKET_UNLOCK(so, 1);
1047                         return;
1048                 }
1049 #endif
1050                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
1051 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1052                 SCTP_SOCKET_UNLOCK(so, 1);
1053 #endif
1054         }
1055 #ifdef INVARIANTS
1056         if (!TAILQ_EMPTY(&asoc->send_queue) ||
1057             !TAILQ_EMPTY(&asoc->sent_queue) ||
1058             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
1059                 panic("Queues are not empty when handling SHUTDOWN-ACK");
1060         }
1061 #endif
1062         /* stop the timer */
1063         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net,
1064             SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
1065         /* send SHUTDOWN-COMPLETE */
1066         sctp_send_shutdown_complete(stcb, net, 0);
1067         /* notify upper layer protocol */
1068         if (stcb->sctp_socket) {
1069                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1070                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
1071                         stcb->sctp_socket->so_snd.sb_cc = 0;
1072                 }
1073                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
1074         }
1075         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1076         /* free the TCB but first save off the ep */
1077 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1078         atomic_add_int(&stcb->asoc.refcnt, 1);
1079         SCTP_TCB_UNLOCK(stcb);
1080         SCTP_SOCKET_LOCK(so, 1);
1081         SCTP_TCB_LOCK(stcb);
1082         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1083 #endif
1084         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1085             SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1086 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1087         SCTP_SOCKET_UNLOCK(so, 1);
1088 #endif
1089 }
1090
1091 /*
1092  * Skip past the param header and then we will find the chunk that caused the
1093  * problem. There are two possibilities ASCONF or FWD-TSN other than that and
1094  * our peer must be broken.
1095  */
1096 static void
1097 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr,
1098     struct sctp_nets *net)
1099 {
1100         struct sctp_chunkhdr *chk;
1101
1102         chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr));
1103         switch (chk->chunk_type) {
1104         case SCTP_ASCONF_ACK:
1105         case SCTP_ASCONF:
1106                 sctp_asconf_cleanup(stcb, net);
1107                 break;
1108         case SCTP_IFORWARD_CUM_TSN:
1109         case SCTP_FORWARD_CUM_TSN:
1110                 stcb->asoc.prsctp_supported = 0;
1111                 break;
1112         default:
1113                 SCTPDBG(SCTP_DEBUG_INPUT2,
1114                     "Peer does not support chunk type %d(%x)??\n",
1115                     chk->chunk_type, (uint32_t)chk->chunk_type);
1116                 break;
1117         }
1118 }
1119
1120 /*
1121  * Skip past the param header and then we will find the param that caused the
1122  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1123  * these will turn of specific features.
1124  * XXX: Is this the right thing to do?
1125  */
1126 static void
1127 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr)
1128 {
1129         struct sctp_paramhdr *pbad;
1130
1131         pbad = phdr + 1;
1132         switch (ntohs(pbad->param_type)) {
1133                 /* pr-sctp draft */
1134         case SCTP_PRSCTP_SUPPORTED:
1135                 stcb->asoc.prsctp_supported = 0;
1136                 break;
1137         case SCTP_SUPPORTED_CHUNK_EXT:
1138                 break;
1139                 /* draft-ietf-tsvwg-addip-sctp */
1140         case SCTP_HAS_NAT_SUPPORT:
1141                 stcb->asoc.peer_supports_nat = 0;
1142                 break;
1143         case SCTP_ADD_IP_ADDRESS:
1144         case SCTP_DEL_IP_ADDRESS:
1145         case SCTP_SET_PRIM_ADDR:
1146                 stcb->asoc.asconf_supported = 0;
1147                 break;
1148         case SCTP_SUCCESS_REPORT:
1149         case SCTP_ERROR_CAUSE_IND:
1150                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1151                 SCTPDBG(SCTP_DEBUG_INPUT2,
1152                     "Turning off ASCONF to this strange peer\n");
1153                 stcb->asoc.asconf_supported = 0;
1154                 break;
1155         default:
1156                 SCTPDBG(SCTP_DEBUG_INPUT2,
1157                     "Peer does not support param type %d(%x)??\n",
1158                     pbad->param_type, (uint32_t)pbad->param_type);
1159                 break;
1160         }
1161 }
1162
1163 static int
1164 sctp_handle_error(struct sctp_chunkhdr *ch,
1165     struct sctp_tcb *stcb, struct sctp_nets *net)
1166 {
1167         int chklen;
1168         struct sctp_paramhdr *phdr;
1169         uint16_t error, error_type;
1170         uint16_t error_len;
1171         struct sctp_association *asoc;
1172         int adjust;
1173 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1174         struct socket *so;
1175 #endif
1176
1177         /* parse through all of the errors and process */
1178         asoc = &stcb->asoc;
1179         phdr = (struct sctp_paramhdr *)((caddr_t)ch +
1180             sizeof(struct sctp_chunkhdr));
1181         chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr);
1182         error = 0;
1183         while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) {
1184                 /* Process an Error Cause */
1185                 error_type = ntohs(phdr->param_type);
1186                 error_len = ntohs(phdr->param_length);
1187                 if ((error_len > chklen) || (error_len == 0)) {
1188                         /* invalid param length for this param */
1189                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n",
1190                             chklen, error_len);
1191                         return (0);
1192                 }
1193                 if (error == 0) {
1194                         /* report the first error cause */
1195                         error = error_type;
1196                 }
1197                 switch (error_type) {
1198                 case SCTP_CAUSE_INVALID_STREAM:
1199                 case SCTP_CAUSE_MISSING_PARAM:
1200                 case SCTP_CAUSE_INVALID_PARAM:
1201                 case SCTP_CAUSE_NO_USER_DATA:
1202                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n",
1203                             error_type);
1204                         break;
1205                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1206                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
1207                             ch->chunk_flags);
1208                         if (sctp_handle_nat_colliding_state(stcb)) {
1209                                 return (0);
1210                         }
1211                         break;
1212                 case SCTP_CAUSE_NAT_MISSING_STATE:
1213                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
1214                             ch->chunk_flags);
1215                         if (sctp_handle_nat_missing_state(stcb, net)) {
1216                                 return (0);
1217                         }
1218                         break;
1219                 case SCTP_CAUSE_STALE_COOKIE:
1220                         /*
1221                          * We only act if we have echoed a cookie and are
1222                          * waiting.
1223                          */
1224                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
1225                                 int *p;
1226
1227                                 p = (int *)((caddr_t)phdr + sizeof(*phdr));
1228                                 /* Save the time doubled */
1229                                 asoc->cookie_preserve_req = ntohl(*p) << 1;
1230                                 asoc->stale_cookie_count++;
1231                                 if (asoc->stale_cookie_count >
1232                                     asoc->max_init_times) {
1233                                         sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED);
1234                                         /* now free the asoc */
1235 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1236                                         so = SCTP_INP_SO(stcb->sctp_ep);
1237                                         atomic_add_int(&stcb->asoc.refcnt, 1);
1238                                         SCTP_TCB_UNLOCK(stcb);
1239                                         SCTP_SOCKET_LOCK(so, 1);
1240                                         SCTP_TCB_LOCK(stcb);
1241                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1242 #endif
1243                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1244                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1245 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1246                                         SCTP_SOCKET_UNLOCK(so, 1);
1247 #endif
1248                                         return (-1);
1249                                 }
1250                                 /* blast back to INIT state */
1251                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
1252                                 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED;
1253                                 asoc->state |= SCTP_STATE_COOKIE_WAIT;
1254                                 sctp_stop_all_cookie_timers(stcb);
1255                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1256                         }
1257                         break;
1258                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1259                         /*
1260                          * Nothing we can do here, we don't do hostname
1261                          * addresses so if the peer does not like my IPv6
1262                          * (or IPv4 for that matter) it does not matter. If
1263                          * they don't support that type of address, they can
1264                          * NOT possibly get that packet type... i.e. with no
1265                          * IPv6 you can't receive a IPv6 packet. so we can
1266                          * safely ignore this one. If we ever added support
1267                          * for HOSTNAME Addresses, then we would need to do
1268                          * something here.
1269                          */
1270                         break;
1271                 case SCTP_CAUSE_UNRECOG_CHUNK:
1272                         sctp_process_unrecog_chunk(stcb, phdr, net);
1273                         break;
1274                 case SCTP_CAUSE_UNRECOG_PARAM:
1275                         sctp_process_unrecog_param(stcb, phdr);
1276                         break;
1277                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1278                         /*
1279                          * We ignore this since the timer will drive out a
1280                          * new cookie anyway and there timer will drive us
1281                          * to send a SHUTDOWN_COMPLETE. We can't send one
1282                          * here since we don't have their tag.
1283                          */
1284                         break;
1285                 case SCTP_CAUSE_DELETING_LAST_ADDR:
1286                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1287                 case SCTP_CAUSE_DELETING_SRC_ADDR:
1288                         /*
1289                          * We should NOT get these here, but in a
1290                          * ASCONF-ACK.
1291                          */
1292                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n",
1293                             error_type);
1294                         break;
1295                 case SCTP_CAUSE_OUT_OF_RESC:
1296                         /*
1297                          * And what, pray tell do we do with the fact that
1298                          * the peer is out of resources? Not really sure we
1299                          * could do anything but abort. I suspect this
1300                          * should have came WITH an abort instead of in a
1301                          * OP-ERROR.
1302                          */
1303                         break;
1304                 default:
1305                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n",
1306                             error_type);
1307                         break;
1308                 }
1309                 adjust = SCTP_SIZE32(error_len);
1310                 chklen -= adjust;
1311                 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust);
1312         }
1313         sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED);
1314         return (0);
1315 }
1316
1317 static int
1318 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1319     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
1320     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1321     struct sctp_nets *net, int *abort_no_unlock,
1322     uint8_t mflowtype, uint32_t mflowid,
1323     uint32_t vrf_id)
1324 {
1325         struct sctp_init_ack *init_ack;
1326         struct mbuf *op_err;
1327
1328         SCTPDBG(SCTP_DEBUG_INPUT2,
1329             "sctp_handle_init_ack: handling INIT-ACK\n");
1330
1331         if (stcb == NULL) {
1332                 SCTPDBG(SCTP_DEBUG_INPUT2,
1333                     "sctp_handle_init_ack: TCB is null\n");
1334                 return (-1);
1335         }
1336         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1337                 /* Invalid length */
1338                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1339                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1340                     src, dst, sh, op_err,
1341                     mflowtype, mflowid,
1342                     vrf_id, net->port);
1343                 *abort_no_unlock = 1;
1344                 return (-1);
1345         }
1346         init_ack = &cp->init;
1347         /* validate parameters */
1348         if (init_ack->initiate_tag == 0) {
1349                 /* protocol error... send an abort */
1350                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1351                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1352                     src, dst, sh, op_err,
1353                     mflowtype, mflowid,
1354                     vrf_id, net->port);
1355                 *abort_no_unlock = 1;
1356                 return (-1);
1357         }
1358         if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1359                 /* protocol error... send an abort */
1360                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1361                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1362                     src, dst, sh, op_err,
1363                     mflowtype, mflowid,
1364                     vrf_id, net->port);
1365                 *abort_no_unlock = 1;
1366                 return (-1);
1367         }
1368         if (init_ack->num_inbound_streams == 0) {
1369                 /* protocol error... send an abort */
1370                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1371                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1372                     src, dst, sh, op_err,
1373                     mflowtype, mflowid,
1374                     vrf_id, net->port);
1375                 *abort_no_unlock = 1;
1376                 return (-1);
1377         }
1378         if (init_ack->num_outbound_streams == 0) {
1379                 /* protocol error... send an abort */
1380                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1381                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1382                     src, dst, sh, op_err,
1383                     mflowtype, mflowid,
1384                     vrf_id, net->port);
1385                 *abort_no_unlock = 1;
1386                 return (-1);
1387         }
1388         /* process according to association state... */
1389         switch (stcb->asoc.state & SCTP_STATE_MASK) {
1390         case SCTP_STATE_COOKIE_WAIT:
1391                 /* this is the expected state for this chunk */
1392                 /* process the INIT-ACK parameters */
1393                 if (stcb->asoc.primary_destination->dest_state &
1394                     SCTP_ADDR_UNCONFIRMED) {
1395                         /*
1396                          * The primary is where we sent the INIT, we can
1397                          * always consider it confirmed when the INIT-ACK is
1398                          * returned. Do this before we load addresses
1399                          * though.
1400                          */
1401                         stcb->asoc.primary_destination->dest_state &=
1402                             ~SCTP_ADDR_UNCONFIRMED;
1403                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1404                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1405                 }
1406                 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
1407                     net, abort_no_unlock,
1408                     mflowtype, mflowid,
1409                     vrf_id) < 0) {
1410                         /* error in parsing parameters */
1411                         return (-1);
1412                 }
1413                 /* update our state */
1414                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1415                 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED);
1416
1417                 /* reset the RTO calc */
1418                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1419                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1420                             stcb->asoc.overall_error_count,
1421                             0,
1422                             SCTP_FROM_SCTP_INPUT,
1423                             __LINE__);
1424                 }
1425                 stcb->asoc.overall_error_count = 0;
1426                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1427                 /*
1428                  * collapse the init timer back in case of a exponential
1429                  * backoff
1430                  */
1431                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1432                     stcb, net);
1433                 /*
1434                  * the send at the end of the inbound data processing will
1435                  * cause the cookie to be sent
1436                  */
1437                 break;
1438         case SCTP_STATE_SHUTDOWN_SENT:
1439                 /* incorrect state... discard */
1440                 break;
1441         case SCTP_STATE_COOKIE_ECHOED:
1442                 /* incorrect state... discard */
1443                 break;
1444         case SCTP_STATE_OPEN:
1445                 /* incorrect state... discard */
1446                 break;
1447         case SCTP_STATE_EMPTY:
1448         case SCTP_STATE_INUSE:
1449         default:
1450                 /* incorrect state... discard */
1451                 return (-1);
1452                 break;
1453         }
1454         SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1455         return (0);
1456 }
1457
1458 static struct sctp_tcb *
1459 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1460     struct sockaddr *src, struct sockaddr *dst,
1461     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1462     struct sctp_inpcb *inp, struct sctp_nets **netp,
1463     struct sockaddr *init_src, int *notification,
1464     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1465     uint8_t mflowtype, uint32_t mflowid,
1466     uint32_t vrf_id, uint16_t port);
1467
1468
1469 /*
1470  * handle a state cookie for an existing association m: input packet mbuf
1471  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1472  * "split" mbuf and the cookie signature does not exist offset: offset into
1473  * mbuf to the cookie-echo chunk
1474  */
1475 static struct sctp_tcb *
1476 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1477     struct sockaddr *src, struct sockaddr *dst,
1478     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1479     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1480     struct sockaddr *init_src, int *notification,
1481     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1482     uint8_t mflowtype, uint32_t mflowid,
1483     uint32_t vrf_id, uint16_t port)
1484 {
1485         struct sctp_association *asoc;
1486         struct sctp_init_chunk *init_cp, init_buf;
1487         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1488         struct sctp_nets *net;
1489         struct mbuf *op_err;
1490         int init_offset, initack_offset, i;
1491         int retval;
1492         int spec_flag = 0;
1493         uint32_t how_indx;
1494 #if defined(SCTP_DETAILED_STR_STATS)
1495         int j;
1496 #endif
1497
1498         net = *netp;
1499         /* I know that the TCB is non-NULL from the caller */
1500         asoc = &stcb->asoc;
1501         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1502                 if (asoc->cookie_how[how_indx] == 0)
1503                         break;
1504         }
1505         if (how_indx < sizeof(asoc->cookie_how)) {
1506                 asoc->cookie_how[how_indx] = 1;
1507         }
1508         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1509                 /* SHUTDOWN came in after sending INIT-ACK */
1510                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1511                 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, "");
1512                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
1513                     mflowtype, mflowid, inp->fibnum,
1514                     vrf_id, net->port);
1515                 if (how_indx < sizeof(asoc->cookie_how))
1516                         asoc->cookie_how[how_indx] = 2;
1517                 return (NULL);
1518         }
1519         /*
1520          * find and validate the INIT chunk in the cookie (peer's info) the
1521          * INIT should start after the cookie-echo header struct (chunk
1522          * header, state cookie header struct)
1523          */
1524         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1525
1526         init_cp = (struct sctp_init_chunk *)
1527             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1528             (uint8_t *)&init_buf);
1529         if (init_cp == NULL) {
1530                 /* could not pull a INIT chunk in cookie */
1531                 return (NULL);
1532         }
1533         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1534                 return (NULL);
1535         }
1536         /*
1537          * find and validate the INIT-ACK chunk in the cookie (my info) the
1538          * INIT-ACK follows the INIT chunk
1539          */
1540         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1541         initack_cp = (struct sctp_init_ack_chunk *)
1542             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1543             (uint8_t *)&initack_buf);
1544         if (initack_cp == NULL) {
1545                 /* could not pull INIT-ACK chunk in cookie */
1546                 return (NULL);
1547         }
1548         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1549                 return (NULL);
1550         }
1551         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1552             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1553                 /*
1554                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
1555                  * to get into the OPEN state
1556                  */
1557                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1558                         /*-
1559                          * Opps, this means that we somehow generated two vtag's
1560                          * the same. I.e. we did:
1561                          *  Us               Peer
1562                          *   <---INIT(tag=a)------
1563                          *   ----INIT-ACK(tag=t)-->
1564                          *   ----INIT(tag=t)------> *1
1565                          *   <---INIT-ACK(tag=a)---
1566                          *   <----CE(tag=t)------------- *2
1567                          *
1568                          * At point *1 we should be generating a different
1569                          * tag t'. Which means we would throw away the CE and send
1570                          * ours instead. Basically this is case C (throw away side).
1571                          */
1572                         if (how_indx < sizeof(asoc->cookie_how))
1573                                 asoc->cookie_how[how_indx] = 17;
1574                         return (NULL);
1575
1576                 }
1577                 switch (SCTP_GET_STATE(asoc)) {
1578                 case SCTP_STATE_COOKIE_WAIT:
1579                 case SCTP_STATE_COOKIE_ECHOED:
1580                         /*
1581                          * INIT was sent but got a COOKIE_ECHO with the
1582                          * correct tags... just accept it...but we must
1583                          * process the init so that we can make sure we have
1584                          * the right seq no's.
1585                          */
1586                         /* First we must process the INIT !! */
1587                         retval = sctp_process_init(init_cp, stcb);
1588                         if (retval < 0) {
1589                                 if (how_indx < sizeof(asoc->cookie_how))
1590                                         asoc->cookie_how[how_indx] = 3;
1591                                 return (NULL);
1592                         }
1593                         /* we have already processed the INIT so no problem */
1594                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp,
1595                             stcb, net,
1596                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1597                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp,
1598                             stcb, net,
1599                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1600                         /* update current state */
1601                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1602                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1603                         else
1604                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1605
1606                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1607                         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1608                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1609                                     stcb->sctp_ep, stcb, asoc->primary_destination);
1610                         }
1611                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1612                         sctp_stop_all_cookie_timers(stcb);
1613                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1614                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1615                             (!SCTP_IS_LISTENING(inp))) {
1616 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1617                                 struct socket *so;
1618 #endif
1619                                 /*
1620                                  * Here is where collision would go if we
1621                                  * did a connect() and instead got a
1622                                  * init/init-ack/cookie done before the
1623                                  * init-ack came back..
1624                                  */
1625                                 stcb->sctp_ep->sctp_flags |=
1626                                     SCTP_PCB_FLAGS_CONNECTED;
1627 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1628                                 so = SCTP_INP_SO(stcb->sctp_ep);
1629                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1630                                 SCTP_TCB_UNLOCK(stcb);
1631                                 SCTP_SOCKET_LOCK(so, 1);
1632                                 SCTP_TCB_LOCK(stcb);
1633                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1634                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1635                                         SCTP_SOCKET_UNLOCK(so, 1);
1636                                         return (NULL);
1637                                 }
1638 #endif
1639                                 soisconnected(stcb->sctp_socket);
1640 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1641                                 SCTP_SOCKET_UNLOCK(so, 1);
1642 #endif
1643                         }
1644                         /* notify upper layer */
1645                         *notification = SCTP_NOTIFY_ASSOC_UP;
1646                         /*
1647                          * since we did not send a HB make sure we don't
1648                          * double things
1649                          */
1650                         net->hb_responded = 1;
1651                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
1652                             &cookie->time_entered,
1653                             sctp_align_unsafe_makecopy,
1654                             SCTP_RTT_FROM_NON_DATA);
1655
1656                         if (stcb->asoc.sctp_autoclose_ticks &&
1657                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1658                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1659                                     inp, stcb, NULL);
1660                         }
1661                         break;
1662                 default:
1663                         /*
1664                          * we're in the OPEN state (or beyond), so peer must
1665                          * have simply lost the COOKIE-ACK
1666                          */
1667                         break;
1668                 }               /* end switch */
1669                 sctp_stop_all_cookie_timers(stcb);
1670                 /*
1671                  * We ignore the return code here.. not sure if we should
1672                  * somehow abort.. but we do have an existing asoc. This
1673                  * really should not fail.
1674                  */
1675                 if (sctp_load_addresses_from_init(stcb, m,
1676                     init_offset + sizeof(struct sctp_init_chunk),
1677                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
1678                         if (how_indx < sizeof(asoc->cookie_how))
1679                                 asoc->cookie_how[how_indx] = 4;
1680                         return (NULL);
1681                 }
1682                 /* respond with a COOKIE-ACK */
1683                 sctp_toss_old_cookies(stcb, asoc);
1684                 sctp_send_cookie_ack(stcb);
1685                 if (how_indx < sizeof(asoc->cookie_how))
1686                         asoc->cookie_how[how_indx] = 5;
1687                 return (stcb);
1688         }
1689         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1690             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1691             cookie->tie_tag_my_vtag == 0 &&
1692             cookie->tie_tag_peer_vtag == 0) {
1693                 /*
1694                  * case C in Section 5.2.4 Table 2: XMOO silently discard
1695                  */
1696                 if (how_indx < sizeof(asoc->cookie_how))
1697                         asoc->cookie_how[how_indx] = 6;
1698                 return (NULL);
1699         }
1700         /*
1701          * If nat support, and the below and stcb is established, send back
1702          * a ABORT(colliding state) if we are established.
1703          */
1704         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) &&
1705             (asoc->peer_supports_nat) &&
1706             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1707             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1708             (asoc->peer_vtag == 0)))) {
1709                 /*
1710                  * Special case - Peer's support nat. We may have two init's
1711                  * that we gave out the same tag on since one was not
1712                  * established.. i.e. we get INIT from host-1 behind the nat
1713                  * and we respond tag-a, we get a INIT from host-2 behind
1714                  * the nat and we get tag-a again. Then we bring up host-1
1715                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1716                  * Now we have colliding state. We must send an abort here
1717                  * with colliding state indication.
1718                  */
1719                 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, "");
1720                 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
1721                     mflowtype, mflowid, inp->fibnum,
1722                     vrf_id, port);
1723                 return (NULL);
1724         }
1725         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1726             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1727             (asoc->peer_vtag == 0))) {
1728                 /*
1729                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1730                  * should be ok, re-accept peer info
1731                  */
1732                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1733                         /*
1734                          * Extension of case C. If we hit this, then the
1735                          * random number generator returned the same vtag
1736                          * when we first sent our INIT-ACK and when we later
1737                          * sent our INIT. The side with the seq numbers that
1738                          * are different will be the one that normnally
1739                          * would have hit case C. This in effect "extends"
1740                          * our vtags in this collision case to be 64 bits.
1741                          * The same collision could occur aka you get both
1742                          * vtag and seq number the same twice in a row.. but
1743                          * is much less likely. If it did happen then we
1744                          * would proceed through and bring up the assoc.. we
1745                          * may end up with the wrong stream setup however..
1746                          * which would be bad.. but there is no way to
1747                          * tell.. until we send on a stream that does not
1748                          * exist :-)
1749                          */
1750                         if (how_indx < sizeof(asoc->cookie_how))
1751                                 asoc->cookie_how[how_indx] = 7;
1752
1753                         return (NULL);
1754                 }
1755                 if (how_indx < sizeof(asoc->cookie_how))
1756                         asoc->cookie_how[how_indx] = 8;
1757                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1758                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1759                 sctp_stop_all_cookie_timers(stcb);
1760                 /*
1761                  * since we did not send a HB make sure we don't double
1762                  * things
1763                  */
1764                 net->hb_responded = 1;
1765                 if (stcb->asoc.sctp_autoclose_ticks &&
1766                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1767                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1768                             NULL);
1769                 }
1770                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1771                 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1772
1773                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1774                         /*
1775                          * Ok the peer probably discarded our data (if we
1776                          * echoed a cookie+data). So anything on the
1777                          * sent_queue should be marked for retransmit, we
1778                          * may not get something to kick us so it COULD
1779                          * still take a timeout to move these.. but it can't
1780                          * hurt to mark them.
1781                          */
1782                         struct sctp_tmit_chunk *chk;
1783
1784                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1785                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1786                                         chk->sent = SCTP_DATAGRAM_RESEND;
1787                                         sctp_flight_size_decrease(chk);
1788                                         sctp_total_flight_decrease(stcb, chk);
1789                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1790                                         spec_flag++;
1791                                 }
1792                         }
1793
1794                 }
1795                 /* process the INIT info (peer's info) */
1796                 retval = sctp_process_init(init_cp, stcb);
1797                 if (retval < 0) {
1798                         if (how_indx < sizeof(asoc->cookie_how))
1799                                 asoc->cookie_how[how_indx] = 9;
1800                         return (NULL);
1801                 }
1802                 if (sctp_load_addresses_from_init(stcb, m,
1803                     init_offset + sizeof(struct sctp_init_chunk),
1804                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
1805                         if (how_indx < sizeof(asoc->cookie_how))
1806                                 asoc->cookie_how[how_indx] = 10;
1807                         return (NULL);
1808                 }
1809                 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) ||
1810                     (asoc->state & SCTP_STATE_COOKIE_ECHOED)) {
1811                         *notification = SCTP_NOTIFY_ASSOC_UP;
1812
1813                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1814                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1815                             (!SCTP_IS_LISTENING(inp))) {
1816 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1817                                 struct socket *so;
1818 #endif
1819                                 stcb->sctp_ep->sctp_flags |=
1820                                     SCTP_PCB_FLAGS_CONNECTED;
1821 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1822                                 so = SCTP_INP_SO(stcb->sctp_ep);
1823                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1824                                 SCTP_TCB_UNLOCK(stcb);
1825                                 SCTP_SOCKET_LOCK(so, 1);
1826                                 SCTP_TCB_LOCK(stcb);
1827                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1828                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1829                                         SCTP_SOCKET_UNLOCK(so, 1);
1830                                         return (NULL);
1831                                 }
1832 #endif
1833                                 soisconnected(stcb->sctp_socket);
1834 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1835                                 SCTP_SOCKET_UNLOCK(so, 1);
1836 #endif
1837                         }
1838                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1839                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1840                         else
1841                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1842                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1843                 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1844                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1845                 } else {
1846                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1847                 }
1848                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1849                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1850                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1851                             stcb->sctp_ep, stcb, asoc->primary_destination);
1852                 }
1853                 sctp_stop_all_cookie_timers(stcb);
1854                 sctp_toss_old_cookies(stcb, asoc);
1855                 sctp_send_cookie_ack(stcb);
1856                 if (spec_flag) {
1857                         /*
1858                          * only if we have retrans set do we do this. What
1859                          * this call does is get only the COOKIE-ACK out and
1860                          * then when we return the normal call to
1861                          * sctp_chunk_output will get the retrans out behind
1862                          * this.
1863                          */
1864                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1865                 }
1866                 if (how_indx < sizeof(asoc->cookie_how))
1867                         asoc->cookie_how[how_indx] = 11;
1868
1869                 return (stcb);
1870         }
1871         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1872             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1873             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1874             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1875             cookie->tie_tag_peer_vtag != 0) {
1876                 struct sctpasochead *head;
1877 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1878                 struct socket *so;
1879 #endif
1880
1881                 if (asoc->peer_supports_nat) {
1882                         /*
1883                          * This is a gross gross hack. Just call the
1884                          * cookie_new code since we are allowing a duplicate
1885                          * association. I hope this works...
1886                          */
1887                         return (sctp_process_cookie_new(m, iphlen, offset, src, dst,
1888                             sh, cookie, cookie_len,
1889                             inp, netp, init_src, notification,
1890                             auth_skipped, auth_offset, auth_len,
1891                             mflowtype, mflowid,
1892                             vrf_id, port));
1893                 }
1894                 /*
1895                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1896                  */
1897                 /* temp code */
1898                 if (how_indx < sizeof(asoc->cookie_how))
1899                         asoc->cookie_how[how_indx] = 12;
1900                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net,
1901                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1902                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1903                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
1904
1905                 /* notify upper layer */
1906                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1907                 atomic_add_int(&stcb->asoc.refcnt, 1);
1908                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) &&
1909                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1910                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
1911                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1912                 }
1913                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1914                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1915                 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1916                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1917                 }
1918                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1919                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1920                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1921                             stcb->sctp_ep, stcb, asoc->primary_destination);
1922
1923                 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) {
1924                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1925                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1926                 }
1927                 asoc->pre_open_streams =
1928                     ntohs(initack_cp->init.num_outbound_streams);
1929                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1930                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1931                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1932
1933                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1934
1935                 asoc->str_reset_seq_in = asoc->init_seq_number;
1936
1937                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1938                 if (asoc->mapping_array) {
1939                         memset(asoc->mapping_array, 0,
1940                             asoc->mapping_array_size);
1941                 }
1942                 if (asoc->nr_mapping_array) {
1943                         memset(asoc->nr_mapping_array, 0,
1944                             asoc->mapping_array_size);
1945                 }
1946                 SCTP_TCB_UNLOCK(stcb);
1947 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1948                 so = SCTP_INP_SO(stcb->sctp_ep);
1949                 SCTP_SOCKET_LOCK(so, 1);
1950 #endif
1951                 SCTP_INP_INFO_WLOCK();
1952                 SCTP_INP_WLOCK(stcb->sctp_ep);
1953                 SCTP_TCB_LOCK(stcb);
1954                 atomic_add_int(&stcb->asoc.refcnt, -1);
1955                 /* send up all the data */
1956                 SCTP_TCB_SEND_LOCK(stcb);
1957
1958                 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED);
1959                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1960                         stcb->asoc.strmout[i].chunks_on_queues = 0;
1961 #if defined(SCTP_DETAILED_STR_STATS)
1962                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
1963                                 asoc->strmout[i].abandoned_sent[j] = 0;
1964                                 asoc->strmout[i].abandoned_unsent[j] = 0;
1965                         }
1966 #else
1967                         asoc->strmout[i].abandoned_sent[0] = 0;
1968                         asoc->strmout[i].abandoned_unsent[0] = 0;
1969 #endif
1970                         stcb->asoc.strmout[i].sid = i;
1971                         stcb->asoc.strmout[i].next_mid_ordered = 0;
1972                         stcb->asoc.strmout[i].next_mid_unordered = 0;
1973                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
1974                 }
1975                 /* process the INIT-ACK info (my info) */
1976                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1977                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1978
1979                 /* pull from vtag hash */
1980                 LIST_REMOVE(stcb, sctp_asocs);
1981                 /* re-insert to new vtag position */
1982                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1983                     SCTP_BASE_INFO(hashasocmark))];
1984                 /*
1985                  * put it in the bucket in the vtag hash of assoc's for the
1986                  * system
1987                  */
1988                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
1989
1990                 SCTP_TCB_SEND_UNLOCK(stcb);
1991                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
1992                 SCTP_INP_INFO_WUNLOCK();
1993 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1994                 SCTP_SOCKET_UNLOCK(so, 1);
1995 #endif
1996                 asoc->total_flight = 0;
1997                 asoc->total_flight_count = 0;
1998                 /* process the INIT info (peer's info) */
1999                 retval = sctp_process_init(init_cp, stcb);
2000                 if (retval < 0) {
2001                         if (how_indx < sizeof(asoc->cookie_how))
2002                                 asoc->cookie_how[how_indx] = 13;
2003
2004                         return (NULL);
2005                 }
2006                 /*
2007                  * since we did not send a HB make sure we don't double
2008                  * things
2009                  */
2010                 net->hb_responded = 1;
2011
2012                 if (sctp_load_addresses_from_init(stcb, m,
2013                     init_offset + sizeof(struct sctp_init_chunk),
2014                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
2015                         if (how_indx < sizeof(asoc->cookie_how))
2016                                 asoc->cookie_how[how_indx] = 14;
2017
2018                         return (NULL);
2019                 }
2020                 /* respond with a COOKIE-ACK */
2021                 sctp_stop_all_cookie_timers(stcb);
2022                 sctp_toss_old_cookies(stcb, asoc);
2023                 sctp_send_cookie_ack(stcb);
2024                 if (how_indx < sizeof(asoc->cookie_how))
2025                         asoc->cookie_how[how_indx] = 15;
2026
2027                 return (stcb);
2028         }
2029         if (how_indx < sizeof(asoc->cookie_how))
2030                 asoc->cookie_how[how_indx] = 16;
2031         /* all other cases... */
2032         return (NULL);
2033 }
2034
2035
2036 /*
2037  * handle a state cookie for a new association m: input packet mbuf chain--
2038  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
2039  * and the cookie signature does not exist offset: offset into mbuf to the
2040  * cookie-echo chunk length: length of the cookie chunk to: where the init
2041  * was from returns a new TCB
2042  */
2043 static struct sctp_tcb *
2044 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
2045     struct sockaddr *src, struct sockaddr *dst,
2046     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
2047     struct sctp_inpcb *inp, struct sctp_nets **netp,
2048     struct sockaddr *init_src, int *notification,
2049     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2050     uint8_t mflowtype, uint32_t mflowid,
2051     uint32_t vrf_id, uint16_t port)
2052 {
2053         struct sctp_tcb *stcb;
2054         struct sctp_init_chunk *init_cp, init_buf;
2055         struct sctp_init_ack_chunk *initack_cp, initack_buf;
2056         union sctp_sockstore store;
2057         struct sctp_association *asoc;
2058         int init_offset, initack_offset, initack_limit;
2059         int retval;
2060         int error = 0;
2061         uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
2062 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2063         struct socket *so;
2064
2065         so = SCTP_INP_SO(inp);
2066 #endif
2067
2068         /*
2069          * find and validate the INIT chunk in the cookie (peer's info) the
2070          * INIT should start after the cookie-echo header struct (chunk
2071          * header, state cookie header struct)
2072          */
2073         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
2074         init_cp = (struct sctp_init_chunk *)
2075             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
2076             (uint8_t *)&init_buf);
2077         if (init_cp == NULL) {
2078                 /* could not pull a INIT chunk in cookie */
2079                 SCTPDBG(SCTP_DEBUG_INPUT1,
2080                     "process_cookie_new: could not pull INIT chunk hdr\n");
2081                 return (NULL);
2082         }
2083         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
2084                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
2085                 return (NULL);
2086         }
2087         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
2088         /*
2089          * find and validate the INIT-ACK chunk in the cookie (my info) the
2090          * INIT-ACK follows the INIT chunk
2091          */
2092         initack_cp = (struct sctp_init_ack_chunk *)
2093             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
2094             (uint8_t *)&initack_buf);
2095         if (initack_cp == NULL) {
2096                 /* could not pull INIT-ACK chunk in cookie */
2097                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2098                 return (NULL);
2099         }
2100         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2101                 return (NULL);
2102         }
2103         /*
2104          * NOTE: We can't use the INIT_ACK's chk_length to determine the
2105          * "initack_limit" value.  This is because the chk_length field
2106          * includes the length of the cookie, but the cookie is omitted when
2107          * the INIT and INIT_ACK are tacked onto the cookie...
2108          */
2109         initack_limit = offset + cookie_len;
2110
2111         /*
2112          * now that we know the INIT/INIT-ACK are in place, create a new TCB
2113          * and popluate
2114          */
2115
2116         /*
2117          * Here we do a trick, we set in NULL for the proc/thread argument.
2118          * We do this since in effect we only use the p argument when the
2119          * socket is unbound and we must do an implicit bind. Since we are
2120          * getting a cookie, we cannot be unbound.
2121          */
2122         stcb = sctp_aloc_assoc(inp, init_src, &error,
2123             ntohl(initack_cp->init.initiate_tag), vrf_id,
2124             ntohs(initack_cp->init.num_outbound_streams),
2125             port,
2126             (struct thread *)NULL
2127             );
2128         if (stcb == NULL) {
2129                 struct mbuf *op_err;
2130
2131                 /* memory problem? */
2132                 SCTPDBG(SCTP_DEBUG_INPUT1,
2133                     "process_cookie_new: no room for another TCB!\n");
2134                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2135                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2136                     src, dst, sh, op_err,
2137                     mflowtype, mflowid,
2138                     vrf_id, port);
2139                 return (NULL);
2140         }
2141         /* get the correct sctp_nets */
2142         if (netp)
2143                 *netp = sctp_findnet(stcb, init_src);
2144
2145         asoc = &stcb->asoc;
2146         /* get scope variables out of cookie */
2147         asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
2148         asoc->scope.site_scope = cookie->site_scope;
2149         asoc->scope.local_scope = cookie->local_scope;
2150         asoc->scope.loopback_scope = cookie->loopback_scope;
2151
2152         if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2153             (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2154                 struct mbuf *op_err;
2155
2156                 /*
2157                  * Houston we have a problem. The EP changed while the
2158                  * cookie was in flight. Only recourse is to abort the
2159                  * association.
2160                  */
2161                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2162                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2163                     src, dst, sh, op_err,
2164                     mflowtype, mflowid,
2165                     vrf_id, port);
2166 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2167                 atomic_add_int(&stcb->asoc.refcnt, 1);
2168                 SCTP_TCB_UNLOCK(stcb);
2169                 SCTP_SOCKET_LOCK(so, 1);
2170                 SCTP_TCB_LOCK(stcb);
2171                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2172 #endif
2173                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2174                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2175 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2176                 SCTP_SOCKET_UNLOCK(so, 1);
2177 #endif
2178                 return (NULL);
2179         }
2180         /* process the INIT-ACK info (my info) */
2181         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2182         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2183         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2184         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2185         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2186         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2187         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2188         asoc->str_reset_seq_in = asoc->init_seq_number;
2189
2190         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2191
2192         /* process the INIT info (peer's info) */
2193         if (netp)
2194                 retval = sctp_process_init(init_cp, stcb);
2195         else
2196                 retval = 0;
2197         if (retval < 0) {
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_19);
2207 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2208                 SCTP_SOCKET_UNLOCK(so, 1);
2209 #endif
2210                 return (NULL);
2211         }
2212         /* load all addresses */
2213         if (sctp_load_addresses_from_init(stcb, m,
2214             init_offset + sizeof(struct sctp_init_chunk), initack_offset,
2215             src, dst, init_src, port)) {
2216 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2217                 atomic_add_int(&stcb->asoc.refcnt, 1);
2218                 SCTP_TCB_UNLOCK(stcb);
2219                 SCTP_SOCKET_LOCK(so, 1);
2220                 SCTP_TCB_LOCK(stcb);
2221                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2222 #endif
2223                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2224                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2225 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2226                 SCTP_SOCKET_UNLOCK(so, 1);
2227 #endif
2228                 return (NULL);
2229         }
2230         /*
2231          * verify any preceding AUTH chunk that was skipped
2232          */
2233         /* pull the local authentication parameters from the cookie/init-ack */
2234         sctp_auth_get_cookie_params(stcb, m,
2235             initack_offset + sizeof(struct sctp_init_ack_chunk),
2236             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2237         if (auth_skipped) {
2238                 struct sctp_auth_chunk *auth;
2239
2240                 auth = (struct sctp_auth_chunk *)
2241                     sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2242                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2243                         /* auth HMAC failed, dump the assoc and packet */
2244                         SCTPDBG(SCTP_DEBUG_AUTH1,
2245                             "COOKIE-ECHO: AUTH failed\n");
2246 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2247                         atomic_add_int(&stcb->asoc.refcnt, 1);
2248                         SCTP_TCB_UNLOCK(stcb);
2249                         SCTP_SOCKET_LOCK(so, 1);
2250                         SCTP_TCB_LOCK(stcb);
2251                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2252 #endif
2253                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2254                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_21);
2255 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2256                         SCTP_SOCKET_UNLOCK(so, 1);
2257 #endif
2258                         return (NULL);
2259                 } else {
2260                         /* remaining chunks checked... good to go */
2261                         stcb->asoc.authenticated = 1;
2262                 }
2263         }
2264         /*
2265          * if we're doing ASCONFs, check to see if we have any new local
2266          * addresses that need to get added to the peer (eg. addresses
2267          * changed while cookie echo in flight).  This needs to be done
2268          * after we go to the OPEN state to do the correct asconf
2269          * processing. else, make sure we have the correct addresses in our
2270          * lists
2271          */
2272
2273         /* warning, we re-use sin, sin6, sa_store here! */
2274         /* pull in local_address (our "from" address) */
2275         switch (cookie->laddr_type) {
2276 #ifdef INET
2277         case SCTP_IPV4_ADDRESS:
2278                 /* source addr is IPv4 */
2279                 memset(&store.sin, 0, sizeof(struct sockaddr_in));
2280                 store.sin.sin_family = AF_INET;
2281                 store.sin.sin_len = sizeof(struct sockaddr_in);
2282                 store.sin.sin_addr.s_addr = cookie->laddress[0];
2283                 break;
2284 #endif
2285 #ifdef INET6
2286         case SCTP_IPV6_ADDRESS:
2287                 /* source addr is IPv6 */
2288                 memset(&store.sin6, 0, sizeof(struct sockaddr_in6));
2289                 store.sin6.sin6_family = AF_INET6;
2290                 store.sin6.sin6_len = sizeof(struct sockaddr_in6);
2291                 store.sin6.sin6_scope_id = cookie->scope_id;
2292                 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr));
2293                 break;
2294 #endif
2295         default:
2296 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2297                 atomic_add_int(&stcb->asoc.refcnt, 1);
2298                 SCTP_TCB_UNLOCK(stcb);
2299                 SCTP_SOCKET_LOCK(so, 1);
2300                 SCTP_TCB_LOCK(stcb);
2301                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2302 #endif
2303                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2304                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
2305 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2306                 SCTP_SOCKET_UNLOCK(so, 1);
2307 #endif
2308                 return (NULL);
2309         }
2310
2311         /* update current state */
2312         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2313         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2314         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2315                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2316                     stcb->sctp_ep, stcb, asoc->primary_destination);
2317         }
2318         sctp_stop_all_cookie_timers(stcb);
2319         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2320         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2321
2322         /* set up to notify upper layer */
2323         *notification = SCTP_NOTIFY_ASSOC_UP;
2324         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2325             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2326             (!SCTP_IS_LISTENING(inp))) {
2327                 /*
2328                  * This is an endpoint that called connect() how it got a
2329                  * cookie that is NEW is a bit of a mystery. It must be that
2330                  * the INIT was sent, but before it got there.. a complete
2331                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2332                  * should have went to the other code.. not here.. oh well..
2333                  * a bit of protection is worth having..
2334                  */
2335                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2336 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2337                 atomic_add_int(&stcb->asoc.refcnt, 1);
2338                 SCTP_TCB_UNLOCK(stcb);
2339                 SCTP_SOCKET_LOCK(so, 1);
2340                 SCTP_TCB_LOCK(stcb);
2341                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2342                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2343                         SCTP_SOCKET_UNLOCK(so, 1);
2344                         return (NULL);
2345                 }
2346 #endif
2347                 soisconnected(stcb->sctp_socket);
2348 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2349                 SCTP_SOCKET_UNLOCK(so, 1);
2350 #endif
2351         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2352             (SCTP_IS_LISTENING(inp))) {
2353                 /*
2354                  * We don't want to do anything with this one. Since it is
2355                  * the listening guy. The timer will get started for
2356                  * accepted connections in the caller.
2357                  */
2358                 ;
2359         }
2360         /* since we did not send a HB make sure we don't double things */
2361         if ((netp) && (*netp))
2362                 (*netp)->hb_responded = 1;
2363
2364         if (stcb->asoc.sctp_autoclose_ticks &&
2365             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2366                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2367         }
2368         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2369         if ((netp != NULL) && (*netp != NULL)) {
2370                 /* calculate the RTT and set the encaps port */
2371                 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
2372                     &cookie->time_entered, sctp_align_unsafe_makecopy,
2373                     SCTP_RTT_FROM_NON_DATA);
2374         }
2375         /* respond with a COOKIE-ACK */
2376         sctp_send_cookie_ack(stcb);
2377
2378         /*
2379          * check the address lists for any ASCONFs that need to be sent
2380          * AFTER the cookie-ack is sent
2381          */
2382         sctp_check_address_list(stcb, m,
2383             initack_offset + sizeof(struct sctp_init_ack_chunk),
2384             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2385             &store.sa, cookie->local_scope, cookie->site_scope,
2386             cookie->ipv4_scope, cookie->loopback_scope);
2387
2388
2389         return (stcb);
2390 }
2391
2392 /*
2393  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2394  * we NEED to make sure we are not already using the vtag. If so we
2395  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2396         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2397                                                             SCTP_BASE_INFO(hashasocmark))];
2398         LIST_FOREACH(stcb, head, sctp_asocs) {
2399                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2400                        -- SEND ABORT - TRY AGAIN --
2401                 }
2402         }
2403 */
2404
2405 /*
2406  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2407  * existing (non-NULL) TCB
2408  */
2409 static struct mbuf *
2410 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2411     struct sockaddr *src, struct sockaddr *dst,
2412     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2413     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2414     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2415     struct sctp_tcb **locked_tcb,
2416     uint8_t mflowtype, uint32_t mflowid,
2417     uint32_t vrf_id, uint16_t port)
2418 {
2419         struct sctp_state_cookie *cookie;
2420         struct sctp_tcb *l_stcb = *stcb;
2421         struct sctp_inpcb *l_inp;
2422         struct sockaddr *to;
2423         struct sctp_pcb *ep;
2424         struct mbuf *m_sig;
2425         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2426         uint8_t *sig;
2427         uint8_t cookie_ok = 0;
2428         unsigned int sig_offset, cookie_offset;
2429         unsigned int cookie_len;
2430         struct timeval now;
2431         struct timeval time_expires;
2432         int notification = 0;
2433         struct sctp_nets *netl;
2434         int had_a_existing_tcb = 0;
2435         int send_int_conf = 0;
2436 #ifdef INET
2437         struct sockaddr_in sin;
2438 #endif
2439 #ifdef INET6
2440         struct sockaddr_in6 sin6;
2441 #endif
2442
2443         SCTPDBG(SCTP_DEBUG_INPUT2,
2444             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2445
2446         if (inp_p == NULL) {
2447                 return (NULL);
2448         }
2449         cookie = &cp->cookie;
2450         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2451         cookie_len = ntohs(cp->ch.chunk_length);
2452
2453         if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2454             sizeof(struct sctp_init_chunk) +
2455             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2456                 /* cookie too small */
2457                 return (NULL);
2458         }
2459         if ((cookie->peerport != sh->src_port) ||
2460             (cookie->myport != sh->dest_port) ||
2461             (cookie->my_vtag != sh->v_tag)) {
2462                 /*
2463                  * invalid ports or bad tag.  Note that we always leave the
2464                  * v_tag in the header in network order and when we stored
2465                  * it in the my_vtag slot we also left it in network order.
2466                  * This maintains the match even though it may be in the
2467                  * opposite byte order of the machine :->
2468                  */
2469                 return (NULL);
2470         }
2471         /*
2472          * split off the signature into its own mbuf (since it should not be
2473          * calculated in the sctp_hmac_m() call).
2474          */
2475         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2476         m_sig = m_split(m, sig_offset, M_NOWAIT);
2477         if (m_sig == NULL) {
2478                 /* out of memory or ?? */
2479                 return (NULL);
2480         }
2481 #ifdef SCTP_MBUF_LOGGING
2482         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2483                 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT);
2484         }
2485 #endif
2486
2487         /*
2488          * compute the signature/digest for the cookie
2489          */
2490         ep = &(*inp_p)->sctp_ep;
2491         l_inp = *inp_p;
2492         if (l_stcb) {
2493                 SCTP_TCB_UNLOCK(l_stcb);
2494         }
2495         SCTP_INP_RLOCK(l_inp);
2496         if (l_stcb) {
2497                 SCTP_TCB_LOCK(l_stcb);
2498         }
2499         /* which cookie is it? */
2500         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2501             (ep->current_secret_number != ep->last_secret_number)) {
2502                 /* it's the old cookie */
2503                 (void)sctp_hmac_m(SCTP_HMAC,
2504                     (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2505                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2506         } else {
2507                 /* it's the current cookie */
2508                 (void)sctp_hmac_m(SCTP_HMAC,
2509                     (uint8_t *)ep->secret_key[(int)ep->current_secret_number],
2510                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2511         }
2512         /* get the signature */
2513         SCTP_INP_RUNLOCK(l_inp);
2514         sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig);
2515         if (sig == NULL) {
2516                 /* couldn't find signature */
2517                 sctp_m_freem(m_sig);
2518                 return (NULL);
2519         }
2520         /* compare the received digest with the computed digest */
2521         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2522                 /* try the old cookie? */
2523                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2524                     (ep->current_secret_number != ep->last_secret_number)) {
2525                         /* compute digest with old */
2526                         (void)sctp_hmac_m(SCTP_HMAC,
2527                             (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2528                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2529                         /* compare */
2530                         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2531                                 cookie_ok = 1;
2532                 }
2533         } else {
2534                 cookie_ok = 1;
2535         }
2536
2537         /*
2538          * Now before we continue we must reconstruct our mbuf so that
2539          * normal processing of any other chunks will work.
2540          */
2541         {
2542                 struct mbuf *m_at;
2543
2544                 m_at = m;
2545                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2546                         m_at = SCTP_BUF_NEXT(m_at);
2547                 }
2548                 SCTP_BUF_NEXT(m_at) = m_sig;
2549         }
2550
2551         if (cookie_ok == 0) {
2552                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2553                 SCTPDBG(SCTP_DEBUG_INPUT2,
2554                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2555                     (uint32_t)offset, cookie_offset, sig_offset);
2556                 return (NULL);
2557         }
2558         /*
2559          * check the cookie timestamps to be sure it's not stale
2560          */
2561         (void)SCTP_GETTIME_TIMEVAL(&now);
2562         /* Expire time is in Ticks, so we convert to seconds */
2563         time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
2564         time_expires.tv_usec = cookie->time_entered.tv_usec;
2565         if (timevalcmp(&now, &time_expires, >)) {
2566                 /* cookie is stale! */
2567                 struct mbuf *op_err;
2568                 struct sctp_error_stale_cookie *cause;
2569                 struct timeval diff;
2570                 uint32_t staleness;
2571
2572                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie),
2573                     0, M_NOWAIT, 1, MT_DATA);
2574                 if (op_err == NULL) {
2575                         /* FOOBAR */
2576                         return (NULL);
2577                 }
2578                 /* Set the len */
2579                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie);
2580                 cause = mtod(op_err, struct sctp_error_stale_cookie *);
2581                 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE);
2582                 cause->cause.length = htons((sizeof(struct sctp_paramhdr) +
2583                     (sizeof(uint32_t))));
2584                 diff = now;
2585                 timevalsub(&diff, &time_expires);
2586                 if (diff.tv_sec > UINT32_MAX / 1000000) {
2587                         staleness = UINT32_MAX;
2588                 } else {
2589                         staleness = diff.tv_sec * 1000000;
2590                 }
2591                 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) {
2592                         staleness += diff.tv_usec;
2593                 } else {
2594                         staleness = UINT32_MAX;
2595                 }
2596                 cause->stale_time = htonl(staleness);
2597                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
2598                     mflowtype, mflowid, l_inp->fibnum,
2599                     vrf_id, port);
2600                 return (NULL);
2601         }
2602         /*
2603          * Now we must see with the lookup address if we have an existing
2604          * asoc. This will only happen if we were in the COOKIE-WAIT state
2605          * and a INIT collided with us and somewhere the peer sent the
2606          * cookie on another address besides the single address our assoc
2607          * had for him. In this case we will have one of the tie-tags set at
2608          * least AND the address field in the cookie can be used to look it
2609          * up.
2610          */
2611         to = NULL;
2612         switch (cookie->addr_type) {
2613 #ifdef INET6
2614         case SCTP_IPV6_ADDRESS:
2615                 memset(&sin6, 0, sizeof(sin6));
2616                 sin6.sin6_family = AF_INET6;
2617                 sin6.sin6_len = sizeof(sin6);
2618                 sin6.sin6_port = sh->src_port;
2619                 sin6.sin6_scope_id = cookie->scope_id;
2620                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2621                     sizeof(sin6.sin6_addr.s6_addr));
2622                 to = (struct sockaddr *)&sin6;
2623                 break;
2624 #endif
2625 #ifdef INET
2626         case SCTP_IPV4_ADDRESS:
2627                 memset(&sin, 0, sizeof(sin));
2628                 sin.sin_family = AF_INET;
2629                 sin.sin_len = sizeof(sin);
2630                 sin.sin_port = sh->src_port;
2631                 sin.sin_addr.s_addr = cookie->address[0];
2632                 to = (struct sockaddr *)&sin;
2633                 break;
2634 #endif
2635         default:
2636                 /* This should not happen */
2637                 return (NULL);
2638         }
2639         if (*stcb == NULL) {
2640                 /* Yep, lets check */
2641                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
2642                 if (*stcb == NULL) {
2643                         /*
2644                          * We should have only got back the same inp. If we
2645                          * got back a different ep we have a problem. The
2646                          * original findep got back l_inp and now
2647                          */
2648                         if (l_inp != *inp_p) {
2649                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2650                         }
2651                 } else {
2652                         if (*locked_tcb == NULL) {
2653                                 /*
2654                                  * In this case we found the assoc only
2655                                  * after we locked the create lock. This
2656                                  * means we are in a colliding case and we
2657                                  * must make sure that we unlock the tcb if
2658                                  * its one of the cases where we throw away
2659                                  * the incoming packets.
2660                                  */
2661                                 *locked_tcb = *stcb;
2662
2663                                 /*
2664                                  * We must also increment the inp ref count
2665                                  * since the ref_count flags was set when we
2666                                  * did not find the TCB, now we found it
2667                                  * which reduces the refcount.. we must
2668                                  * raise it back out to balance it all :-)
2669                                  */
2670                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2671                                 if ((*stcb)->sctp_ep != l_inp) {
2672                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2673                                             (void *)(*stcb)->sctp_ep, (void *)l_inp);
2674                                 }
2675                         }
2676                 }
2677         }
2678         cookie_len -= SCTP_SIGNATURE_SIZE;
2679         if (*stcb == NULL) {
2680                 /* this is the "normal" case... get a new TCB */
2681                 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
2682                     cookie, cookie_len, *inp_p,
2683                     netp, to, &notification,
2684                     auth_skipped, auth_offset, auth_len,
2685                     mflowtype, mflowid,
2686                     vrf_id, port);
2687         } else {
2688                 /* this is abnormal... cookie-echo on existing TCB */
2689                 had_a_existing_tcb = 1;
2690                 *stcb = sctp_process_cookie_existing(m, iphlen, offset,
2691                     src, dst, sh,
2692                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2693                     &notification, auth_skipped, auth_offset, auth_len,
2694                     mflowtype, mflowid,
2695                     vrf_id, port);
2696         }
2697
2698         if (*stcb == NULL) {
2699                 /* still no TCB... must be bad cookie-echo */
2700                 return (NULL);
2701         }
2702         if (*netp != NULL) {
2703                 (*netp)->flowtype = mflowtype;
2704                 (*netp)->flowid = mflowid;
2705         }
2706         /*
2707          * Ok, we built an association so confirm the address we sent the
2708          * INIT-ACK to.
2709          */
2710         netl = sctp_findnet(*stcb, to);
2711         /*
2712          * This code should in theory NOT run but
2713          */
2714         if (netl == NULL) {
2715                 /* TSNH! Huh, why do I need to add this address here? */
2716                 if (sctp_add_remote_addr(*stcb, to, NULL, port,
2717                     SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2718                         return (NULL);
2719                 }
2720                 netl = sctp_findnet(*stcb, to);
2721         }
2722         if (netl) {
2723                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2724                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2725                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2726                             netl);
2727                         send_int_conf = 1;
2728                 }
2729         }
2730         sctp_start_net_timers(*stcb);
2731         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2732                 if (!had_a_existing_tcb ||
2733                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2734                         /*
2735                          * If we have a NEW cookie or the connect never
2736                          * reached the connected state during collision we
2737                          * must do the TCP accept thing.
2738                          */
2739                         struct socket *so, *oso;
2740                         struct sctp_inpcb *inp;
2741
2742                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2743                                 /*
2744                                  * For a restart we will keep the same
2745                                  * socket, no need to do anything. I THINK!!
2746                                  */
2747                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2748                                 if (send_int_conf) {
2749                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2750                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2751                                 }
2752                                 return (m);
2753                         }
2754                         oso = (*inp_p)->sctp_socket;
2755                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2756                         SCTP_TCB_UNLOCK((*stcb));
2757                         CURVNET_SET(oso->so_vnet);
2758                         so = sonewconn(oso, 0
2759                             );
2760                         CURVNET_RESTORE();
2761                         SCTP_TCB_LOCK((*stcb));
2762                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2763
2764                         if (so == NULL) {
2765                                 struct mbuf *op_err;
2766 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2767                                 struct socket *pcb_so;
2768 #endif
2769                                 /* Too many sockets */
2770                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2771                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2772                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2773                                     src, dst, sh, op_err,
2774                                     mflowtype, mflowid,
2775                                     vrf_id, port);
2776 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2777                                 pcb_so = SCTP_INP_SO(*inp_p);
2778                                 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2779                                 SCTP_TCB_UNLOCK((*stcb));
2780                                 SCTP_SOCKET_LOCK(pcb_so, 1);
2781                                 SCTP_TCB_LOCK((*stcb));
2782                                 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2783 #endif
2784                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC,
2785                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
2786 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2787                                 SCTP_SOCKET_UNLOCK(pcb_so, 1);
2788 #endif
2789                                 return (NULL);
2790                         }
2791                         inp = (struct sctp_inpcb *)so->so_pcb;
2792                         SCTP_INP_INCR_REF(inp);
2793                         /*
2794                          * We add the unbound flag here so that if we get an
2795                          * soabort() before we get the move_pcb done, we
2796                          * will properly cleanup.
2797                          */
2798                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2799                             SCTP_PCB_FLAGS_CONNECTED |
2800                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2801                             SCTP_PCB_FLAGS_UNBOUND |
2802                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2803                             SCTP_PCB_FLAGS_DONT_WAKE);
2804                         inp->sctp_features = (*inp_p)->sctp_features;
2805                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2806                         inp->sctp_socket = so;
2807                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2808                         inp->max_cwnd = (*inp_p)->max_cwnd;
2809                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2810                         inp->ecn_supported = (*inp_p)->ecn_supported;
2811                         inp->prsctp_supported = (*inp_p)->prsctp_supported;
2812                         inp->auth_supported = (*inp_p)->auth_supported;
2813                         inp->asconf_supported = (*inp_p)->asconf_supported;
2814                         inp->reconfig_supported = (*inp_p)->reconfig_supported;
2815                         inp->nrsack_supported = (*inp_p)->nrsack_supported;
2816                         inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
2817                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2818                         inp->sctp_context = (*inp_p)->sctp_context;
2819                         inp->local_strreset_support = (*inp_p)->local_strreset_support;
2820                         inp->fibnum = (*inp_p)->fibnum;
2821                         inp->inp_starting_point_for_iterator = NULL;
2822                         /*
2823                          * copy in the authentication parameters from the
2824                          * original endpoint
2825                          */
2826                         if (inp->sctp_ep.local_hmacs)
2827                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2828                         inp->sctp_ep.local_hmacs =
2829                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2830                         if (inp->sctp_ep.local_auth_chunks)
2831                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2832                         inp->sctp_ep.local_auth_chunks =
2833                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2834
2835                         /*
2836                          * Now we must move it from one hash table to
2837                          * another and get the tcb in the right place.
2838                          */
2839
2840                         /*
2841                          * This is where the one-2-one socket is put into
2842                          * the accept state waiting for the accept!
2843                          */
2844                         if (*stcb) {
2845                                 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE;
2846                         }
2847                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2848
2849                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2850                         SCTP_TCB_UNLOCK((*stcb));
2851
2852                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2853                             0);
2854                         SCTP_TCB_LOCK((*stcb));
2855                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2856
2857
2858                         /*
2859                          * now we must check to see if we were aborted while
2860                          * the move was going on and the lock/unlock
2861                          * happened.
2862                          */
2863                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2864                                 /*
2865                                  * yep it was, we leave the assoc attached
2866                                  * to the socket since the sctp_inpcb_free()
2867                                  * call will send an abort for us.
2868                                  */
2869                                 SCTP_INP_DECR_REF(inp);
2870                                 return (NULL);
2871                         }
2872                         SCTP_INP_DECR_REF(inp);
2873                         /* Switch over to the new guy */
2874                         *inp_p = inp;
2875                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2876                         if (send_int_conf) {
2877                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2878                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2879                         }
2880                         /*
2881                          * Pull it from the incomplete queue and wake the
2882                          * guy
2883                          */
2884 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2885                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2886                         SCTP_TCB_UNLOCK((*stcb));
2887                         SCTP_SOCKET_LOCK(so, 1);
2888 #endif
2889                         soisconnected(so);
2890 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2891                         SCTP_TCB_LOCK((*stcb));
2892                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2893                         SCTP_SOCKET_UNLOCK(so, 1);
2894 #endif
2895                         return (m);
2896                 }
2897         }
2898         if (notification) {
2899                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2900         }
2901         if (send_int_conf) {
2902                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2903                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2904         }
2905         return (m);
2906 }
2907
2908 static void
2909 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2910     struct sctp_tcb *stcb, struct sctp_nets *net)
2911 {
2912         /* cp must not be used, others call this without a c-ack :-) */
2913         struct sctp_association *asoc;
2914
2915         SCTPDBG(SCTP_DEBUG_INPUT2,
2916             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2917         if ((stcb == NULL) || (net == NULL)) {
2918                 return;
2919         }
2920         asoc = &stcb->asoc;
2921
2922         sctp_stop_all_cookie_timers(stcb);
2923         /* process according to association state */
2924         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
2925                 /* state change only needed when I am in right state */
2926                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2927                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2928                 sctp_start_net_timers(stcb);
2929                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2930                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2931                             stcb->sctp_ep, stcb, asoc->primary_destination);
2932
2933                 }
2934                 /* update RTO */
2935                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2936                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2937                 if (asoc->overall_error_count == 0) {
2938                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
2939                             &asoc->time_entered, sctp_align_safe_nocopy,
2940                             SCTP_RTT_FROM_NON_DATA);
2941                 }
2942                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2943                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2944                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2945                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2946 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2947                         struct socket *so;
2948
2949 #endif
2950                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2951 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2952                         so = SCTP_INP_SO(stcb->sctp_ep);
2953                         atomic_add_int(&stcb->asoc.refcnt, 1);
2954                         SCTP_TCB_UNLOCK(stcb);
2955                         SCTP_SOCKET_LOCK(so, 1);
2956                         SCTP_TCB_LOCK(stcb);
2957                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2958 #endif
2959                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
2960                                 soisconnected(stcb->sctp_socket);
2961                         }
2962 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2963                         SCTP_SOCKET_UNLOCK(so, 1);
2964 #endif
2965                 }
2966                 /*
2967                  * since we did not send a HB make sure we don't double
2968                  * things
2969                  */
2970                 net->hb_responded = 1;
2971
2972                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2973                         /*
2974                          * We don't need to do the asconf thing, nor hb or
2975                          * autoclose if the socket is closed.
2976                          */
2977                         goto closed_socket;
2978                 }
2979                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2980                     stcb, net);
2981
2982
2983                 if (stcb->asoc.sctp_autoclose_ticks &&
2984                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2985                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2986                             stcb->sctp_ep, stcb, NULL);
2987                 }
2988                 /*
2989                  * send ASCONF if parameters are pending and ASCONFs are
2990                  * allowed (eg. addresses changed when init/cookie echo were
2991                  * in flight)
2992                  */
2993                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2994                     (stcb->asoc.asconf_supported == 1) &&
2995                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2996 #ifdef SCTP_TIMER_BASED_ASCONF
2997                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2998                             stcb->sctp_ep, stcb,
2999                             stcb->asoc.primary_destination);
3000 #else
3001                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
3002                             SCTP_ADDR_NOT_LOCKED);
3003 #endif
3004                 }
3005         }
3006 closed_socket:
3007         /* Toss the cookie if I can */
3008         sctp_toss_old_cookies(stcb, asoc);
3009         if (!TAILQ_EMPTY(&asoc->sent_queue)) {
3010                 /* Restart the timer if we have pending data */
3011                 struct sctp_tmit_chunk *chk;
3012
3013                 chk = TAILQ_FIRST(&asoc->sent_queue);
3014                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
3015         }
3016 }
3017
3018 static void
3019 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
3020     struct sctp_tcb *stcb)
3021 {
3022         struct sctp_nets *net;
3023         struct sctp_tmit_chunk *lchk;
3024         struct sctp_ecne_chunk bkup;
3025         uint8_t override_bit;
3026         uint32_t tsn, window_data_tsn;
3027         int len;
3028         unsigned int pkt_cnt;
3029
3030         len = ntohs(cp->ch.chunk_length);
3031         if ((len != sizeof(struct sctp_ecne_chunk)) &&
3032             (len != sizeof(struct old_sctp_ecne_chunk))) {
3033                 return;
3034         }
3035         if (len == sizeof(struct old_sctp_ecne_chunk)) {
3036                 /* Its the old format */
3037                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
3038                 bkup.num_pkts_since_cwr = htonl(1);
3039                 cp = &bkup;
3040         }
3041         SCTP_STAT_INCR(sctps_recvecne);
3042         tsn = ntohl(cp->tsn);
3043         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
3044         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
3045         if (lchk == NULL) {
3046                 window_data_tsn = stcb->asoc.sending_seq - 1;
3047         } else {
3048                 window_data_tsn = lchk->rec.data.tsn;
3049         }
3050
3051         /* Find where it was sent to if possible. */
3052         net = NULL;
3053         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
3054                 if (lchk->rec.data.tsn == tsn) {
3055                         net = lchk->whoTo;
3056                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
3057                         break;
3058                 }
3059                 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) {
3060                         break;
3061                 }
3062         }
3063         if (net == NULL) {
3064                 /*
3065                  * What to do. A previous send of a CWR was possibly lost.
3066                  * See how old it is, we may have it marked on the actual
3067                  * net.
3068                  */
3069                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
3070                         if (tsn == net->last_cwr_tsn) {
3071                                 /* Found him, send it off */
3072                                 break;
3073                         }
3074                 }
3075                 if (net == NULL) {
3076                         /*
3077                          * If we reach here, we need to send a special CWR
3078                          * that says hey, we did this a long time ago and
3079                          * you lost the response.
3080                          */
3081                         net = TAILQ_FIRST(&stcb->asoc.nets);
3082                         if (net == NULL) {
3083                                 /* TSNH */
3084                                 return;
3085                         }
3086                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
3087                 } else {
3088                         override_bit = 0;
3089                 }
3090         } else {
3091                 override_bit = 0;
3092         }
3093         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
3094             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3095                 /*
3096                  * JRS - Use the congestion control given in the pluggable
3097                  * CC module
3098                  */
3099                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
3100                 /*
3101                  * We reduce once every RTT. So we will only lower cwnd at
3102                  * the next sending seq i.e. the window_data_tsn
3103                  */
3104                 net->cwr_window_tsn = window_data_tsn;
3105                 net->ecn_ce_pkt_cnt += pkt_cnt;
3106                 net->lost_cnt = pkt_cnt;
3107                 net->last_cwr_tsn = tsn;
3108         } else {
3109                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
3110                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
3111                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3112                         /*
3113                          * Another loss in the same window update how many
3114                          * marks/packets lost we have had.
3115                          */
3116                         int cnt = 1;
3117
3118                         if (pkt_cnt > net->lost_cnt) {
3119                                 /* Should be the case */
3120                                 cnt = (pkt_cnt - net->lost_cnt);
3121                                 net->ecn_ce_pkt_cnt += cnt;
3122                         }
3123                         net->lost_cnt = pkt_cnt;
3124                         net->last_cwr_tsn = tsn;
3125                         /*
3126                          * Most CC functions will ignore this call, since we
3127                          * are in-window yet of the initial CE the peer saw.
3128                          */
3129                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
3130                 }
3131         }
3132         /*
3133          * We always send a CWR this way if our previous one was lost our
3134          * peer will get an update, or if it is not time again to reduce we
3135          * still get the cwr to the peer. Note we set the override when we
3136          * could not find the TSN on the chunk or the destination network.
3137          */
3138         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
3139 }
3140
3141 static void
3142 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3143 {
3144         /*
3145          * Here we get a CWR from the peer. We must look in the outqueue and
3146          * make sure that we have a covered ECNE in the control chunk part.
3147          * If so remove it.
3148          */
3149         struct sctp_tmit_chunk *chk, *nchk;
3150         struct sctp_ecne_chunk *ecne;
3151         int override;
3152         uint32_t cwr_tsn;
3153
3154         cwr_tsn = ntohl(cp->tsn);
3155         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3156         TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) {
3157                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3158                         continue;
3159                 }
3160                 if ((override == 0) && (chk->whoTo != net)) {
3161                         /* Must be from the right src unless override is set */
3162                         continue;
3163                 }
3164                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3165                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3166                         /* this covers this ECNE, we can remove it */
3167                         stcb->asoc.ecn_echo_cnt_onq--;
3168                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3169                             sctp_next);
3170                         sctp_m_freem(chk->data);
3171                         chk->data = NULL;
3172                         stcb->asoc.ctrl_queue_cnt--;
3173                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3174                         if (override == 0) {
3175                                 break;
3176                         }
3177                 }
3178         }
3179 }
3180
3181 static void
3182 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3183     struct sctp_tcb *stcb, struct sctp_nets *net)
3184 {
3185         struct sctp_association *asoc;
3186 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3187         struct socket *so;
3188 #endif
3189
3190         SCTPDBG(SCTP_DEBUG_INPUT2,
3191             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3192         if (stcb == NULL)
3193                 return;
3194
3195         asoc = &stcb->asoc;
3196         /* process according to association state */
3197         if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3198                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3199                 SCTPDBG(SCTP_DEBUG_INPUT2,
3200                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3201                 SCTP_TCB_UNLOCK(stcb);
3202                 return;
3203         }
3204         /* notify upper layer protocol */
3205         if (stcb->sctp_socket) {
3206                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3207         }
3208 #ifdef INVARIANTS
3209         if (!TAILQ_EMPTY(&asoc->send_queue) ||
3210             !TAILQ_EMPTY(&asoc->sent_queue) ||
3211             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
3212                 panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
3213         }
3214 #endif
3215         /* stop the timer */
3216         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net,
3217             SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3218         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3219         /* free the TCB */
3220         SCTPDBG(SCTP_DEBUG_INPUT2,
3221             "sctp_handle_shutdown_complete: calls free-asoc\n");
3222 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3223         so = SCTP_INP_SO(stcb->sctp_ep);
3224         atomic_add_int(&stcb->asoc.refcnt, 1);
3225         SCTP_TCB_UNLOCK(stcb);
3226         SCTP_SOCKET_LOCK(so, 1);
3227         SCTP_TCB_LOCK(stcb);
3228         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3229 #endif
3230         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
3231             SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3232 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3233         SCTP_SOCKET_UNLOCK(so, 1);
3234 #endif
3235         return;
3236 }
3237
3238 static int
3239 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3240     struct sctp_nets *net, uint8_t flg)
3241 {
3242         switch (desc->chunk_type) {
3243         case SCTP_DATA:
3244                 /* find the tsn to resend (possibly */
3245                 {
3246                         uint32_t tsn;
3247                         struct sctp_tmit_chunk *tp1;
3248
3249                         tsn = ntohl(desc->tsn_ifany);
3250                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3251                                 if (tp1->rec.data.tsn == tsn) {
3252                                         /* found it */
3253                                         break;
3254                                 }
3255                                 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) {
3256                                         /* not found */
3257                                         tp1 = NULL;
3258                                         break;
3259                                 }
3260                         }
3261                         if (tp1 == NULL) {
3262                                 /*
3263                                  * Do it the other way , aka without paying
3264                                  * attention to queue seq order.
3265                                  */
3266                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3267                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3268                                         if (tp1->rec.data.tsn == tsn) {
3269                                                 /* found it */
3270                                                 break;
3271                                         }
3272                                 }
3273                         }
3274                         if (tp1 == NULL) {
3275                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3276                         }
3277                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3278                                 uint8_t *ddp;
3279
3280                                 if (((flg & SCTP_BADCRC) == 0) &&
3281                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3282                                         return (0);
3283                                 }
3284                                 if ((stcb->asoc.peers_rwnd == 0) &&
3285                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3286                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3287                                         return (0);
3288                                 }
3289                                 if (stcb->asoc.peers_rwnd == 0 &&
3290                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3291                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3292                                         return (0);
3293                                 }
3294                                 ddp = (uint8_t *)(mtod(tp1->data, caddr_t)+
3295                                     sizeof(struct sctp_data_chunk));
3296                                 {
3297                                         unsigned int iii;
3298
3299                                         for (iii = 0; iii < sizeof(desc->data_bytes);
3300                                             iii++) {
3301                                                 if (ddp[iii] != desc->data_bytes[iii]) {
3302                                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3303                                                         return (-1);
3304                                                 }
3305                                         }
3306                                 }
3307
3308                                 if (tp1->do_rtt) {
3309                                         /*
3310                                          * this guy had a RTO calculation
3311                                          * pending on it, cancel it
3312                                          */
3313                                         if (tp1->whoTo->rto_needed == 0) {
3314                                                 tp1->whoTo->rto_needed = 1;
3315                                         }
3316                                         tp1->do_rtt = 0;
3317                                 }
3318                                 SCTP_STAT_INCR(sctps_pdrpmark);
3319                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3320                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3321                                 /*
3322                                  * mark it as if we were doing a FR, since
3323                                  * we will be getting gap ack reports behind
3324                                  * the info from the router.
3325                                  */
3326                                 tp1->rec.data.doing_fast_retransmit = 1;
3327                                 /*
3328                                  * mark the tsn with what sequences can
3329                                  * cause a new FR.
3330                                  */
3331                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3332                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3333                                 } else {
3334                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn;
3335                                 }
3336
3337                                 /* restart the timer */
3338                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3339                                     stcb, tp1->whoTo,
3340                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3341                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3342                                     stcb, tp1->whoTo);
3343
3344                                 /* fix counts and things */
3345                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3346                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3347                                             tp1->whoTo->flight_size,
3348                                             tp1->book_size,
3349                                             (uint32_t)(uintptr_t)stcb,
3350                                             tp1->rec.data.tsn);
3351                                 }
3352                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3353                                         sctp_flight_size_decrease(tp1);
3354                                         sctp_total_flight_decrease(stcb, tp1);
3355                                 }
3356                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3357                         } {
3358                                 /* audit code */
3359                                 unsigned int audit;
3360
3361                                 audit = 0;
3362                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3363                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3364                                                 audit++;
3365                                 }
3366                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3367                                     sctp_next) {
3368                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3369                                                 audit++;
3370                                 }
3371                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3372                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3373                                             audit, stcb->asoc.sent_queue_retran_cnt);
3374 #ifndef SCTP_AUDITING_ENABLED
3375                                         stcb->asoc.sent_queue_retran_cnt = audit;
3376 #endif
3377                                 }
3378                         }
3379                 }
3380                 break;
3381         case SCTP_ASCONF:
3382                 {
3383                         struct sctp_tmit_chunk *asconf;
3384
3385                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3386                             sctp_next) {
3387                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3388                                         break;
3389                                 }
3390                         }
3391                         if (asconf) {
3392                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3393                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3394                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3395                                 asconf->snd_count--;
3396                         }
3397                 }
3398                 break;
3399         case SCTP_INITIATION:
3400                 /* resend the INIT */
3401                 stcb->asoc.dropped_special_cnt++;
3402                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3403                         /*
3404                          * If we can get it in, in a few attempts we do
3405                          * this, otherwise we let the timer fire.
3406                          */
3407                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3408                             stcb, net,
3409                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
3410                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3411                 }
3412                 break;
3413         case SCTP_SELECTIVE_ACK:
3414         case SCTP_NR_SELECTIVE_ACK:
3415                 /* resend the sack */
3416                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3417                 break;
3418         case SCTP_HEARTBEAT_REQUEST:
3419                 /* resend a demand HB */
3420                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3421                         /*
3422                          * Only retransmit if we KNOW we wont destroy the
3423                          * tcb
3424                          */
3425                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3426                 }
3427                 break;
3428         case SCTP_SHUTDOWN:
3429                 sctp_send_shutdown(stcb, net);
3430                 break;
3431         case SCTP_SHUTDOWN_ACK:
3432                 sctp_send_shutdown_ack(stcb, net);
3433                 break;
3434         case SCTP_COOKIE_ECHO:
3435                 {
3436                         struct sctp_tmit_chunk *cookie;
3437
3438                         cookie = NULL;
3439                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3440                             sctp_next) {
3441                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3442                                         break;
3443                                 }
3444                         }
3445                         if (cookie) {
3446                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3447                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3448                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3449                                 sctp_stop_all_cookie_timers(stcb);
3450                         }
3451                 }
3452                 break;
3453         case SCTP_COOKIE_ACK:
3454                 sctp_send_cookie_ack(stcb);
3455                 break;
3456         case SCTP_ASCONF_ACK:
3457                 /* resend last asconf ack */
3458                 sctp_send_asconf_ack(stcb);
3459                 break;
3460         case SCTP_IFORWARD_CUM_TSN:
3461         case SCTP_FORWARD_CUM_TSN:
3462                 send_forward_tsn(stcb, &stcb->asoc);
3463                 break;
3464                 /* can't do anything with these */
3465         case SCTP_PACKET_DROPPED:
3466         case SCTP_INITIATION_ACK:       /* this should not happen */
3467         case SCTP_HEARTBEAT_ACK:
3468         case SCTP_ABORT_ASSOCIATION:
3469         case SCTP_OPERATION_ERROR:
3470         case SCTP_SHUTDOWN_COMPLETE:
3471         case SCTP_ECN_ECHO:
3472         case SCTP_ECN_CWR:
3473         default:
3474                 break;
3475         }
3476         return (0);
3477 }
3478
3479 void
3480 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3481 {
3482         uint32_t i;
3483         uint16_t temp;
3484
3485         /*
3486          * We set things to 0xffffffff since this is the last delivered
3487          * sequence and we will be sending in 0 after the reset.
3488          */
3489
3490         if (number_entries) {
3491                 for (i = 0; i < number_entries; i++) {
3492                         temp = ntohs(list[i]);
3493                         if (temp >= stcb->asoc.streamincnt) {
3494                                 continue;
3495                         }
3496                         stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff;
3497                 }
3498         } else {
3499                 list = NULL;
3500                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3501                         stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
3502                 }
3503         }
3504         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3505 }
3506
3507 static void
3508 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3509 {
3510         uint32_t i;
3511         uint16_t temp;
3512
3513         if (number_entries > 0) {
3514                 for (i = 0; i < number_entries; i++) {
3515                         temp = ntohs(list[i]);
3516                         if (temp >= stcb->asoc.streamoutcnt) {
3517                                 /* no such stream */
3518                                 continue;
3519                         }
3520                         stcb->asoc.strmout[temp].next_mid_ordered = 0;
3521                         stcb->asoc.strmout[temp].next_mid_unordered = 0;
3522                 }
3523         } else {
3524                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3525                         stcb->asoc.strmout[i].next_mid_ordered = 0;
3526                         stcb->asoc.strmout[i].next_mid_unordered = 0;
3527                 }
3528         }
3529         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3530 }
3531
3532 static void
3533 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3534 {
3535         uint32_t i;
3536         uint16_t temp;
3537
3538         if (number_entries > 0) {
3539                 for (i = 0; i < number_entries; i++) {
3540                         temp = ntohs(list[i]);
3541                         if (temp >= stcb->asoc.streamoutcnt) {
3542                                 /* no such stream */
3543                                 continue;
3544                         }
3545                         stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN;
3546                 }
3547         } else {
3548                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3549                         stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN;
3550                 }
3551         }
3552 }
3553
3554
3555 struct sctp_stream_reset_request *
3556 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3557 {
3558         struct sctp_association *asoc;
3559         struct sctp_chunkhdr *ch;
3560         struct sctp_stream_reset_request *r;
3561         struct sctp_tmit_chunk *chk;
3562         int len, clen;
3563
3564         asoc = &stcb->asoc;
3565         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3566                 asoc->stream_reset_outstanding = 0;
3567                 return (NULL);
3568         }
3569         if (stcb->asoc.str_reset == NULL) {
3570                 asoc->stream_reset_outstanding = 0;
3571                 return (NULL);
3572         }
3573         chk = stcb->asoc.str_reset;
3574         if (chk->data == NULL) {
3575                 return (NULL);
3576         }
3577         if (bchk) {
3578                 /* he wants a copy of the chk pointer */
3579                 *bchk = chk;
3580         }
3581         clen = chk->send_size;
3582         ch = mtod(chk->data, struct sctp_chunkhdr *);
3583         r = (struct sctp_stream_reset_request *)(ch + 1);
3584         if (ntohl(r->request_seq) == seq) {
3585                 /* found it */
3586                 return (r);
3587         }
3588         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3589         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3590                 /* move to the next one, there can only be a max of two */
3591                 r = (struct sctp_stream_reset_request *)((caddr_t)r + len);
3592                 if (ntohl(r->request_seq) == seq) {
3593                         return (r);
3594                 }
3595         }
3596         /* that seq is not here */
3597         return (NULL);
3598 }
3599
3600 static void
3601 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3602 {
3603         struct sctp_association *asoc;
3604         struct sctp_tmit_chunk *chk = stcb->asoc.str_reset;
3605
3606         if (stcb->asoc.str_reset == NULL) {
3607                 return;
3608         }
3609         asoc = &stcb->asoc;
3610
3611         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb,
3612             chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28);
3613         TAILQ_REMOVE(&asoc->control_send_queue,
3614             chk,
3615             sctp_next);
3616         if (chk->data) {
3617                 sctp_m_freem(chk->data);
3618                 chk->data = NULL;
3619         }
3620         asoc->ctrl_queue_cnt--;
3621         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3622         /* sa_ignore NO_NULL_CHK */
3623         stcb->asoc.str_reset = NULL;
3624 }
3625
3626
3627 static int
3628 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3629     uint32_t seq, uint32_t action,
3630     struct sctp_stream_reset_response *respin)
3631 {
3632         uint16_t type;
3633         int lparam_len;
3634         struct sctp_association *asoc = &stcb->asoc;
3635         struct sctp_tmit_chunk *chk;
3636         struct sctp_stream_reset_request *req_param;
3637         struct sctp_stream_reset_out_request *req_out_param;
3638         struct sctp_stream_reset_in_request *req_in_param;
3639         uint32_t number_entries;
3640
3641         if (asoc->stream_reset_outstanding == 0) {
3642                 /* duplicate */
3643                 return (0);
3644         }
3645         if (seq == stcb->asoc.str_reset_seq_out) {
3646                 req_param = sctp_find_stream_reset(stcb, seq, &chk);
3647                 if (req_param != NULL) {
3648                         stcb->asoc.str_reset_seq_out++;
3649                         type = ntohs(req_param->ph.param_type);
3650                         lparam_len = ntohs(req_param->ph.param_length);
3651                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3652                                 int no_clear = 0;
3653
3654                                 req_out_param = (struct sctp_stream_reset_out_request *)req_param;
3655                                 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3656                                 asoc->stream_reset_out_is_outstanding = 0;
3657                                 if (asoc->stream_reset_outstanding)
3658                                         asoc->stream_reset_outstanding--;
3659                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3660                                         /* do it */
3661                                         sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
3662                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3663                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3664                                 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) {
3665                                         /*
3666                                          * Set it up so we don't stop
3667                                          * retransmitting
3668                                          */
3669                                         asoc->stream_reset_outstanding++;
3670                                         stcb->asoc.str_reset_seq_out--;
3671                                         asoc->stream_reset_out_is_outstanding = 1;
3672                                         no_clear = 1;
3673                                 } else {
3674                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3675                                 }
3676                                 if (no_clear == 0) {
3677                                         sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams);
3678                                 }
3679                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3680                                 req_in_param = (struct sctp_stream_reset_in_request *)req_param;
3681                                 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3682                                 if (asoc->stream_reset_outstanding)
3683                                         asoc->stream_reset_outstanding--;
3684                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3685                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3686                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3687                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3688                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3689                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3690                                 }
3691                         } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3692                                 /* Ok we now may have more streams */
3693                                 int num_stream;
3694
3695                                 num_stream = stcb->asoc.strm_pending_add_size;
3696                                 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3697                                         /* TSNH */
3698                                         num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3699                                 }
3700                                 stcb->asoc.strm_pending_add_size = 0;
3701                                 if (asoc->stream_reset_outstanding)
3702                                         asoc->stream_reset_outstanding--;
3703                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3704                                         /* Put the new streams into effect */
3705                                         int i;
3706
3707                                         for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) {
3708                                                 asoc->strmout[i].state = SCTP_STREAM_OPEN;
3709                                         }
3710                                         asoc->streamoutcnt += num_stream;
3711                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3712                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3713                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3714                                             SCTP_STREAM_CHANGE_DENIED);
3715                                 } else {
3716                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3717                                             SCTP_STREAM_CHANGE_FAILED);
3718                                 }
3719                         } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3720                                 if (asoc->stream_reset_outstanding)
3721                                         asoc->stream_reset_outstanding--;
3722                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3723                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3724                                             SCTP_STREAM_CHANGE_DENIED);
3725                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3726                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3727                                             SCTP_STREAM_CHANGE_FAILED);
3728                                 }
3729                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3730                                 /**
3731                                  * a) Adopt the new in tsn.
3732                                  * b) reset the map
3733                                  * c) Adopt the new out-tsn
3734                                  */
3735                                 struct sctp_stream_reset_response_tsn *resp;
3736                                 struct sctp_forward_tsn_chunk fwdtsn;
3737                                 int abort_flag = 0;
3738
3739                                 if (respin == NULL) {
3740                                         /* huh ? */
3741                                         return (0);
3742                                 }
3743                                 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
3744                                         return (0);
3745                                 }
3746                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3747                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3748                                         asoc->stream_reset_outstanding--;
3749                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3750                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3751                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3752                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3753                                         if (abort_flag) {
3754                                                 return (1);
3755                                         }
3756                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3757                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3758                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3759                                         }
3760                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3761                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3762                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3763
3764                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3765                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3766
3767                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3768                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3769
3770                                         sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3771                                         sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3772                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3773                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3774                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3775                                             SCTP_ASSOC_RESET_DENIED);
3776                                 } else {
3777                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3778                                             SCTP_ASSOC_RESET_FAILED);
3779                                 }
3780                         }
3781                         /* get rid of the request and get the request flags */
3782                         if (asoc->stream_reset_outstanding == 0) {
3783                                 sctp_clean_up_stream_reset(stcb);
3784                         }
3785                 }
3786         }
3787         if (asoc->stream_reset_outstanding == 0) {
3788                 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3789         }
3790         return (0);
3791 }
3792
3793 static void
3794 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3795     struct sctp_tmit_chunk *chk,
3796     struct sctp_stream_reset_in_request *req, int trunc)
3797 {
3798         uint32_t seq;
3799         int len, i;
3800         int number_entries;
3801         uint16_t temp;
3802
3803         /*
3804          * peer wants me to send a str-reset to him for my outgoing seq's if
3805          * seq_in is right.
3806          */
3807         struct sctp_association *asoc = &stcb->asoc;
3808
3809         seq = ntohl(req->request_seq);
3810         if (asoc->str_reset_seq_in == seq) {
3811                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3812                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3813                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3814                 } else if (trunc) {
3815                         /* Can't do it, since they exceeded our buffer size  */
3816                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3817                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3818                         len = ntohs(req->ph.param_length);
3819                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3820                         if (number_entries) {
3821                                 for (i = 0; i < number_entries; i++) {
3822                                         temp = ntohs(req->list_of_streams[i]);
3823                                         if (temp >= stcb->asoc.streamoutcnt) {
3824                                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3825                                                 goto bad_boy;
3826                                         }
3827                                         req->list_of_streams[i] = temp;
3828                                 }
3829                                 for (i = 0; i < number_entries; i++) {
3830                                         if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) {
3831                                                 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING;
3832                                         }
3833                                 }
3834                         } else {
3835                                 /* Its all */
3836                                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3837                                         if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN)
3838                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING;
3839                                 }
3840                         }
3841                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3842                 } else {
3843                         /* Can't do it, since we have sent one out */
3844                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3845                 }
3846 bad_boy:
3847                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3848                 asoc->str_reset_seq_in++;
3849         } else if (asoc->str_reset_seq_in - 1 == seq) {
3850                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3851         } else if (asoc->str_reset_seq_in - 2 == seq) {
3852                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3853         } else {
3854                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3855         }
3856         sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3857 }
3858
3859 static int
3860 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3861     struct sctp_tmit_chunk *chk,
3862     struct sctp_stream_reset_tsn_request *req)
3863 {
3864         /* reset all in and out and update the tsn */
3865         /*
3866          * A) reset my str-seq's on in and out. B) Select a receive next,
3867          * and set cum-ack to it. Also process this selected number as a
3868          * fwd-tsn as well. C) set in the response my next sending seq.
3869          */
3870         struct sctp_forward_tsn_chunk fwdtsn;
3871         struct sctp_association *asoc = &stcb->asoc;
3872         int abort_flag = 0;
3873         uint32_t seq;
3874
3875         seq = ntohl(req->request_seq);
3876         if (asoc->str_reset_seq_in == seq) {
3877                 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3878                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3879                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3880                 } else {
3881                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3882                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3883                         fwdtsn.ch.chunk_flags = 0;
3884                         fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3885                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3886                         if (abort_flag) {
3887                                 return (1);
3888                         }
3889                         asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3890                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3891                                 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3892                         }
3893                         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3894                         asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3895                         memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3896                         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3897                         memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3898                         atomic_add_int(&asoc->sending_seq, 1);
3899                         /* save off historical data for retrans */
3900                         asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3901                         asoc->last_sending_seq[0] = asoc->sending_seq;
3902                         asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3903                         asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3904                         sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3905                         sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3906                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3907                         sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3908                 }
3909                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3910                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3911                 asoc->str_reset_seq_in++;
3912         } else if (asoc->str_reset_seq_in - 1 == seq) {
3913                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3914                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3915         } else if (asoc->str_reset_seq_in - 2 == seq) {
3916                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3917                     asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3918         } else {
3919                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3920         }
3921         return (0);
3922 }
3923
3924 static void
3925 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3926     struct sctp_tmit_chunk *chk,
3927     struct sctp_stream_reset_out_request *req, int trunc)
3928 {
3929         uint32_t seq, tsn;
3930         int number_entries, len;
3931         struct sctp_association *asoc = &stcb->asoc;
3932
3933         seq = ntohl(req->request_seq);
3934
3935         /* now if its not a duplicate we process it */
3936         if (asoc->str_reset_seq_in == seq) {
3937                 len = ntohs(req->ph.param_length);
3938                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3939                 /*
3940                  * the sender is resetting, handle the list issue.. we must
3941                  * a) verify if we can do the reset, if so no problem b) If
3942                  * we can't do the reset we must copy the request. c) queue
3943                  * it, and setup the data in processor to trigger it off
3944                  * when needed and dequeue all the queued data.
3945                  */
3946                 tsn = ntohl(req->send_reset_at_tsn);
3947
3948                 /* move the reset action back one */
3949                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3950                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3951                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3952                 } else if (trunc) {
3953                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3954                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3955                         /* we can do it now */
3956                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3957                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3958                 } else {
3959                         /*
3960                          * we must queue it up and thus wait for the TSN's
3961                          * to arrive that are at or before tsn
3962                          */
3963                         struct sctp_stream_reset_list *liste;
3964                         int siz;
3965
3966                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3967                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3968                             siz, SCTP_M_STRESET);
3969                         if (liste == NULL) {
3970                                 /* gak out of memory */
3971                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3972                                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3973                                 return;
3974                         }
3975                         liste->seq = seq;
3976                         liste->tsn = tsn;
3977                         liste->number_entries = number_entries;
3978                         memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
3979                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3980                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS;
3981                 }
3982                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3983                 asoc->str_reset_seq_in++;
3984         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3985                 /*
3986                  * one seq back, just echo back last action since my
3987                  * response was lost.
3988                  */
3989                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3990         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3991                 /*
3992                  * two seq back, just echo back last action since my
3993                  * response was lost.
3994                  */
3995                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3996         } else {
3997                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3998         }
3999 }
4000
4001 static void
4002 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
4003     struct sctp_stream_reset_add_strm *str_add)
4004 {
4005         /*
4006          * Peer is requesting to add more streams. If its within our
4007          * max-streams we will allow it.
4008          */
4009         uint32_t num_stream, i;
4010         uint32_t seq;
4011         struct sctp_association *asoc = &stcb->asoc;
4012         struct sctp_queued_to_read *ctl, *nctl;
4013
4014         /* Get the number. */
4015         seq = ntohl(str_add->request_seq);
4016         num_stream = ntohs(str_add->number_of_streams);
4017         /* Now what would be the new total? */
4018         if (asoc->str_reset_seq_in == seq) {
4019                 num_stream += stcb->asoc.streamincnt;
4020                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4021                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4022                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4023                 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
4024                     (num_stream > 0xffff)) {
4025                         /* We must reject it they ask for to many */
4026         denied:
4027                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4028                 } else {
4029                         /* Ok, we can do that :-) */
4030                         struct sctp_stream_in *oldstrm;
4031
4032                         /* save off the old */
4033                         oldstrm = stcb->asoc.strmin;
4034                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
4035                             (num_stream * sizeof(struct sctp_stream_in)),
4036                             SCTP_M_STRMI);
4037                         if (stcb->asoc.strmin == NULL) {
4038                                 stcb->asoc.strmin = oldstrm;
4039                                 goto denied;
4040                         }
4041                         /* copy off the old data */
4042                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
4043                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
4044                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
4045                                 stcb->asoc.strmin[i].sid = i;
4046                                 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered;
4047                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
4048                                 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started;
4049                                 /* now anything on those queues? */
4050                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) {
4051                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm);
4052                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm);
4053                                 }
4054                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) {
4055                                         TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm);
4056                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm);
4057                                 }
4058                         }
4059                         /* Init the new streams */
4060                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
4061                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
4062                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
4063                                 stcb->asoc.strmin[i].sid = i;
4064                                 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
4065                                 stcb->asoc.strmin[i].pd_api_started = 0;
4066                                 stcb->asoc.strmin[i].delivery_started = 0;
4067                         }
4068                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
4069                         /* update the size */
4070                         stcb->asoc.streamincnt = num_stream;
4071                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4072                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
4073                 }
4074                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4075                 asoc->str_reset_seq_in++;
4076         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4077                 /*
4078                  * one seq back, just echo back last action since my
4079                  * response was lost.
4080                  */
4081                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4082         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4083                 /*
4084                  * two seq back, just echo back last action since my
4085                  * response was lost.
4086                  */
4087                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4088         } else {
4089                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4090
4091         }
4092 }
4093
4094 static void
4095 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
4096     struct sctp_stream_reset_add_strm *str_add)
4097 {
4098         /*
4099          * Peer is requesting to add more streams. If its within our
4100          * max-streams we will allow it.
4101          */
4102         uint16_t num_stream;
4103         uint32_t seq;
4104         struct sctp_association *asoc = &stcb->asoc;
4105
4106         /* Get the number. */
4107         seq = ntohl(str_add->request_seq);
4108         num_stream = ntohs(str_add->number_of_streams);
4109         /* Now what would be the new total? */
4110         if (asoc->str_reset_seq_in == seq) {
4111                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4112                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4113                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4114                 } else if (stcb->asoc.stream_reset_outstanding) {
4115                         /* We must reject it we have something pending */
4116                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
4117                 } else {
4118                         /* Ok, we can do that :-) */
4119                         int mychk;
4120
4121                         mychk = stcb->asoc.streamoutcnt;
4122                         mychk += num_stream;
4123                         if (mychk < 0x10000) {
4124                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4125                                 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) {
4126                                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4127                                 }
4128                         } else {
4129                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4130                         }
4131                 }
4132                 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
4133                 asoc->str_reset_seq_in++;
4134         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4135                 /*
4136                  * one seq back, just echo back last action since my
4137                  * response was lost.
4138                  */
4139                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4140         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4141                 /*
4142                  * two seq back, just echo back last action since my
4143                  * response was lost.
4144                  */
4145                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4146         } else {
4147                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4148         }
4149 }
4150
4151 #ifdef __GNUC__
4152 __attribute__((noinline))
4153 #endif
4154 static int
4155 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
4156     struct sctp_chunkhdr *ch_req)
4157 {
4158         uint16_t remaining_length, param_len, ptype;
4159         struct sctp_paramhdr pstore;
4160         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
4161         uint32_t seq = 0;
4162         int num_req = 0;
4163         int trunc = 0;
4164         struct sctp_tmit_chunk *chk;
4165         struct sctp_chunkhdr *ch;
4166         struct sctp_paramhdr *ph;
4167         int ret_code = 0;
4168         int num_param = 0;
4169
4170         /* now it may be a reset or a reset-response */
4171         remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
4172
4173         /* setup for adding the response */
4174         sctp_alloc_a_chunk(stcb, chk);
4175         if (chk == NULL) {
4176                 return (ret_code);
4177         }
4178         chk->copy_by_ref = 0;
4179         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
4180         chk->rec.chunk_id.can_take_data = 0;
4181         chk->flags = 0;
4182         chk->asoc = &stcb->asoc;
4183         chk->no_fr_allowed = 0;
4184         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
4185         chk->book_size_scale = 0;
4186         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
4187         if (chk->data == NULL) {
4188 strres_nochunk:
4189                 if (chk->data) {
4190                         sctp_m_freem(chk->data);
4191                         chk->data = NULL;
4192                 }
4193                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
4194                 return (ret_code);
4195         }
4196         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
4197
4198         /* setup chunk parameters */
4199         chk->sent = SCTP_DATAGRAM_UNSENT;
4200         chk->snd_count = 0;
4201         chk->whoTo = NULL;
4202
4203         ch = mtod(chk->data, struct sctp_chunkhdr *);
4204         ch->chunk_type = SCTP_STREAM_RESET;
4205         ch->chunk_flags = 0;
4206         ch->chunk_length = htons(chk->send_size);
4207         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4208         offset += sizeof(struct sctp_chunkhdr);
4209         while (remaining_length >= sizeof(struct sctp_paramhdr)) {
4210                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore);
4211                 if (ph == NULL) {
4212                         /* TSNH */
4213                         break;
4214                 }
4215                 param_len = ntohs(ph->param_length);
4216                 if ((param_len > remaining_length) ||
4217                     (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
4218                         /* bad parameter length */
4219                         break;
4220                 }
4221                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
4222                     (uint8_t *)&cstore);
4223                 if (ph == NULL) {
4224                         /* TSNH */
4225                         break;
4226                 }
4227                 ptype = ntohs(ph->param_type);
4228                 num_param++;
4229                 if (param_len > sizeof(cstore)) {
4230                         trunc = 1;
4231                 } else {
4232                         trunc = 0;
4233                 }
4234                 if (num_param > SCTP_MAX_RESET_PARAMS) {
4235                         /* hit the max of parameters already sorry.. */
4236                         break;
4237                 }
4238                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4239                         struct sctp_stream_reset_out_request *req_out;
4240
4241                         if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
4242                                 break;
4243                         }
4244                         req_out = (struct sctp_stream_reset_out_request *)ph;
4245                         num_req++;
4246                         if (stcb->asoc.stream_reset_outstanding) {
4247                                 seq = ntohl(req_out->response_seq);
4248                                 if (seq == stcb->asoc.str_reset_seq_out) {
4249                                         /* implicit ack */
4250                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4251                                 }
4252                         }
4253                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4254                 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4255                         struct sctp_stream_reset_add_strm *str_add;
4256
4257                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4258                                 break;
4259                         }
4260                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4261                         num_req++;
4262                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4263                 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4264                         struct sctp_stream_reset_add_strm *str_add;
4265
4266                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4267                                 break;
4268                         }
4269                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4270                         num_req++;
4271                         sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4272                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4273                         struct sctp_stream_reset_in_request *req_in;
4274
4275                         num_req++;
4276                         req_in = (struct sctp_stream_reset_in_request *)ph;
4277                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4278                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4279                         struct sctp_stream_reset_tsn_request *req_tsn;
4280
4281                         num_req++;
4282                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4283                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4284                                 ret_code = 1;
4285                                 goto strres_nochunk;
4286                         }
4287                         /* no more */
4288                         break;
4289                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4290                         struct sctp_stream_reset_response *resp;
4291                         uint32_t result;
4292
4293                         if (param_len < sizeof(struct sctp_stream_reset_response)) {
4294                                 break;
4295                         }
4296                         resp = (struct sctp_stream_reset_response *)ph;
4297                         seq = ntohl(resp->response_seq);
4298                         result = ntohl(resp->result);
4299                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4300                                 ret_code = 1;
4301                                 goto strres_nochunk;
4302                         }
4303                 } else {
4304                         break;
4305                 }
4306                 offset += SCTP_SIZE32(param_len);
4307                 if (remaining_length >= SCTP_SIZE32(param_len)) {
4308                         remaining_length -= SCTP_SIZE32(param_len);
4309                 } else {
4310                         remaining_length = 0;
4311                 }
4312         }
4313         if (num_req == 0) {
4314                 /* we have no response free the stuff */
4315                 goto strres_nochunk;
4316         }
4317         /* ok we have a chunk to link in */
4318         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4319             chk,
4320             sctp_next);
4321         stcb->asoc.ctrl_queue_cnt++;
4322         return (ret_code);
4323 }
4324
4325 /*
4326  * Handle a router or endpoints report of a packet loss, there are two ways
4327  * to handle this, either we get the whole packet and must disect it
4328  * ourselves (possibly with truncation and or corruption) or it is a summary
4329  * from a middle box that did the disectting for us.
4330  */
4331 static void
4332 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4333     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4334 {
4335         uint32_t bottle_bw, on_queue;
4336         uint16_t trunc_len;
4337         unsigned int chlen;
4338         unsigned int at;
4339         struct sctp_chunk_desc desc;
4340         struct sctp_chunkhdr *ch;
4341
4342         chlen = ntohs(cp->ch.chunk_length);
4343         chlen -= sizeof(struct sctp_pktdrop_chunk);
4344         /* XXX possible chlen underflow */
4345         if (chlen == 0) {
4346                 ch = NULL;
4347                 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
4348                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4349         } else {
4350                 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
4351                 chlen -= sizeof(struct sctphdr);
4352                 /* XXX possible chlen underflow */
4353                 memset(&desc, 0, sizeof(desc));
4354         }
4355         trunc_len = (uint16_t)ntohs(cp->trunc_len);
4356         if (trunc_len > limit) {
4357                 trunc_len = limit;
4358         }
4359         /* now the chunks themselves */
4360         while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
4361                 desc.chunk_type = ch->chunk_type;
4362                 /* get amount we need to move */
4363                 at = ntohs(ch->chunk_length);
4364                 if (at < sizeof(struct sctp_chunkhdr)) {
4365                         /* corrupt chunk, maybe at the end? */
4366                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4367                         break;
4368                 }
4369                 if (trunc_len == 0) {
4370                         /* we are supposed to have all of it */
4371                         if (at > chlen) {
4372                                 /* corrupt skip it */
4373                                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4374                                 break;
4375                         }
4376                 } else {
4377                         /* is there enough of it left ? */
4378                         if (desc.chunk_type == SCTP_DATA) {
4379                                 if (chlen < (sizeof(struct sctp_data_chunk) +
4380                                     sizeof(desc.data_bytes))) {
4381                                         break;
4382                                 }
4383                         } else {
4384                                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4385                                         break;
4386                                 }
4387                         }
4388                 }
4389                 if (desc.chunk_type == SCTP_DATA) {
4390                         /* can we get out the tsn? */
4391                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4392                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4393
4394                         if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
4395                                 /* yep */
4396                                 struct sctp_data_chunk *dcp;
4397                                 uint8_t *ddp;
4398                                 unsigned int iii;
4399
4400                                 dcp = (struct sctp_data_chunk *)ch;
4401                                 ddp = (uint8_t *)(dcp + 1);
4402                                 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
4403                                         desc.data_bytes[iii] = ddp[iii];
4404                                 }
4405                                 desc.tsn_ifany = dcp->dp.tsn;
4406                         } else {
4407                                 /* nope we are done. */
4408                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4409                                 break;
4410                         }
4411                 } else {
4412                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4413                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4414                 }
4415
4416                 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
4417                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4418                         break;
4419                 }
4420                 if (SCTP_SIZE32(at) > chlen) {
4421                         break;
4422                 }
4423                 chlen -= SCTP_SIZE32(at);
4424                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4425                         /* done, none left */
4426                         break;
4427                 }
4428                 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
4429         }
4430         /* Now update any rwnd --- possibly */
4431         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4432                 /* From a peer, we get a rwnd report */
4433                 uint32_t a_rwnd;
4434
4435                 SCTP_STAT_INCR(sctps_pdrpfehos);
4436
4437                 bottle_bw = ntohl(cp->bottle_bw);
4438                 on_queue = ntohl(cp->current_onq);
4439                 if (bottle_bw && on_queue) {
4440                         /* a rwnd report is in here */
4441                         if (bottle_bw > on_queue)
4442                                 a_rwnd = bottle_bw - on_queue;
4443                         else
4444                                 a_rwnd = 0;
4445
4446                         if (a_rwnd == 0)
4447                                 stcb->asoc.peers_rwnd = 0;
4448                         else {
4449                                 if (a_rwnd > stcb->asoc.total_flight) {
4450                                         stcb->asoc.peers_rwnd =
4451                                             a_rwnd - stcb->asoc.total_flight;
4452                                 } else {
4453                                         stcb->asoc.peers_rwnd = 0;
4454                                 }
4455                                 if (stcb->asoc.peers_rwnd <
4456                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4457                                         /* SWS sender side engages */
4458                                         stcb->asoc.peers_rwnd = 0;
4459                                 }
4460                         }
4461                 }
4462         } else {
4463                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4464         }
4465
4466         /* now middle boxes in sat networks get a cwnd bump */
4467         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
4468             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4469             (stcb->asoc.sat_network)) {
4470                 /*
4471                  * This is debatable but for sat networks it makes sense
4472                  * Note if a T3 timer has went off, we will prohibit any
4473                  * changes to cwnd until we exit the t3 loss recovery.
4474                  */
4475                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4476                     net, cp, &bottle_bw, &on_queue);
4477         }
4478 }
4479
4480 /*
4481  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4482  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4483  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4484  * length of the complete packet outputs: - length: modified to remaining
4485  * length after control processing - netp: modified to new sctp_nets after
4486  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4487  * bad packet,...) otherwise return the tcb for this packet
4488  */
4489 #ifdef __GNUC__
4490 __attribute__((noinline))
4491 #endif
4492 static struct sctp_tcb *
4493 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4494     struct sockaddr *src, struct sockaddr *dst,
4495     struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4496     struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4497     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
4498     uint32_t vrf_id, uint16_t port)
4499 {
4500         struct sctp_association *asoc;
4501         struct mbuf *op_err;
4502         char msg[SCTP_DIAG_INFO_LEN];
4503         uint32_t vtag_in;
4504         int num_chunks = 0;     /* number of control chunks processed */
4505         uint32_t chk_length;
4506         int ret;
4507         int abort_no_unlock = 0;
4508         int ecne_seen = 0;
4509
4510         /*
4511          * How big should this be, and should it be alloc'd? Lets try the
4512          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4513          * until we get into jumbo grams and such..
4514          */
4515         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4516         struct sctp_tcb *locked_tcb = stcb;
4517         int got_auth = 0;
4518         uint32_t auth_offset = 0, auth_len = 0;
4519         int auth_skipped = 0;
4520         int asconf_cnt = 0;
4521 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4522         struct socket *so;
4523 #endif
4524
4525         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4526             iphlen, *offset, length, (void *)stcb);
4527
4528         /* validate chunk header length... */
4529         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4530                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4531                     ntohs(ch->chunk_length));
4532                 if (locked_tcb) {
4533                         SCTP_TCB_UNLOCK(locked_tcb);
4534                 }
4535                 return (NULL);
4536         }
4537         /*
4538          * validate the verification tag
4539          */
4540         vtag_in = ntohl(sh->v_tag);
4541
4542         if (locked_tcb) {
4543                 SCTP_TCB_LOCK_ASSERT(locked_tcb);
4544         }
4545         if (ch->chunk_type == SCTP_INITIATION) {
4546                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4547                     ntohs(ch->chunk_length), vtag_in);
4548                 if (vtag_in != 0) {
4549                         /* protocol error- silently discard... */
4550                         SCTP_STAT_INCR(sctps_badvtag);
4551                         if (locked_tcb) {
4552                                 SCTP_TCB_UNLOCK(locked_tcb);
4553                         }
4554                         return (NULL);
4555                 }
4556         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4557                 /*
4558                  * If there is no stcb, skip the AUTH chunk and process
4559                  * later after a stcb is found (to validate the lookup was
4560                  * valid.
4561                  */
4562                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4563                     (stcb == NULL) &&
4564                     (inp->auth_supported == 1)) {
4565                         /* save this chunk for later processing */
4566                         auth_skipped = 1;
4567                         auth_offset = *offset;
4568                         auth_len = ntohs(ch->chunk_length);
4569
4570                         /* (temporarily) move past this chunk */
4571                         *offset += SCTP_SIZE32(auth_len);
4572                         if (*offset >= length) {
4573                                 /* no more data left in the mbuf chain */
4574                                 *offset = length;
4575                                 if (locked_tcb) {
4576                                         SCTP_TCB_UNLOCK(locked_tcb);
4577                                 }
4578                                 return (NULL);
4579                         }
4580                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4581                             sizeof(struct sctp_chunkhdr), chunk_buf);
4582                 }
4583                 if (ch == NULL) {
4584                         /* Help */
4585                         *offset = length;
4586                         if (locked_tcb) {
4587                                 SCTP_TCB_UNLOCK(locked_tcb);
4588                         }
4589                         return (NULL);
4590                 }
4591                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4592                         goto process_control_chunks;
4593                 }
4594                 /*
4595                  * first check if it's an ASCONF with an unknown src addr we
4596                  * need to look inside to find the association
4597                  */
4598                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4599                         struct sctp_chunkhdr *asconf_ch = ch;
4600                         uint32_t asconf_offset = 0, asconf_len = 0;
4601
4602                         /* inp's refcount may be reduced */
4603                         SCTP_INP_INCR_REF(inp);
4604
4605                         asconf_offset = *offset;
4606                         do {
4607                                 asconf_len = ntohs(asconf_ch->chunk_length);
4608                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4609                                         break;
4610                                 stcb = sctp_findassociation_ep_asconf(m,
4611                                     *offset,
4612                                     dst,
4613                                     sh, &inp, netp, vrf_id);
4614                                 if (stcb != NULL)
4615                                         break;
4616                                 asconf_offset += SCTP_SIZE32(asconf_len);
4617                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4618                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4619                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4620                         if (stcb == NULL) {
4621                                 /*
4622                                  * reduce inp's refcount if not reduced in
4623                                  * sctp_findassociation_ep_asconf().
4624                                  */
4625                                 SCTP_INP_DECR_REF(inp);
4626                         } else {
4627                                 locked_tcb = stcb;
4628                         }
4629
4630                         /* now go back and verify any auth chunk to be sure */
4631                         if (auth_skipped && (stcb != NULL)) {
4632                                 struct sctp_auth_chunk *auth;
4633
4634                                 auth = (struct sctp_auth_chunk *)
4635                                     sctp_m_getptr(m, auth_offset,
4636                                     auth_len, chunk_buf);
4637                                 got_auth = 1;
4638                                 auth_skipped = 0;
4639                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4640                                     auth_offset)) {
4641                                         /* auth HMAC failed so dump it */
4642                                         *offset = length;
4643                                         if (locked_tcb) {
4644                                                 SCTP_TCB_UNLOCK(locked_tcb);
4645                                         }
4646                                         return (NULL);
4647                                 } else {
4648                                         /* remaining chunks are HMAC checked */
4649                                         stcb->asoc.authenticated = 1;
4650                                 }
4651                         }
4652                 }
4653                 if (stcb == NULL) {
4654                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4655                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4656                             msg);
4657                         /* no association, so it's out of the blue... */
4658                         sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
4659                             mflowtype, mflowid, inp->fibnum,
4660                             vrf_id, port);
4661                         *offset = length;
4662                         if (locked_tcb) {
4663                                 SCTP_TCB_UNLOCK(locked_tcb);
4664                         }
4665                         return (NULL);
4666                 }
4667                 asoc = &stcb->asoc;
4668                 /* ABORT and SHUTDOWN can use either v_tag... */
4669                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4670                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4671                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4672                         /* Take the T-bit always into account. */
4673                         if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
4674                             (vtag_in == asoc->my_vtag)) ||
4675                             (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
4676                             (asoc->peer_vtag != htonl(0)) &&
4677                             (vtag_in == asoc->peer_vtag))) {
4678                                 /* this is valid */
4679                         } else {
4680                                 /* drop this packet... */
4681                                 SCTP_STAT_INCR(sctps_badvtag);
4682                                 if (locked_tcb) {
4683                                         SCTP_TCB_UNLOCK(locked_tcb);
4684                                 }
4685                                 return (NULL);
4686                         }
4687                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4688                         if (vtag_in != asoc->my_vtag) {
4689                                 /*
4690                                  * this could be a stale SHUTDOWN-ACK or the
4691                                  * peer never got the SHUTDOWN-COMPLETE and
4692                                  * is still hung; we have started a new asoc
4693                                  * but it won't complete until the shutdown
4694                                  * is completed
4695                                  */
4696                                 if (locked_tcb) {
4697                                         SCTP_TCB_UNLOCK(locked_tcb);
4698                                 }
4699                                 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4700                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4701                                     msg);
4702                                 sctp_handle_ootb(m, iphlen, *offset, src, dst,
4703                                     sh, inp, op_err,
4704                                     mflowtype, mflowid, fibnum,
4705                                     vrf_id, port);
4706                                 return (NULL);
4707                         }
4708                 } else {
4709                         /* for all other chunks, vtag must match */
4710                         if (vtag_in != asoc->my_vtag) {
4711                                 /* invalid vtag... */
4712                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4713                                     "invalid vtag: %xh, expect %xh\n",
4714                                     vtag_in, asoc->my_vtag);
4715                                 SCTP_STAT_INCR(sctps_badvtag);
4716                                 if (locked_tcb) {
4717                                         SCTP_TCB_UNLOCK(locked_tcb);
4718                                 }
4719                                 *offset = length;
4720                                 return (NULL);
4721                         }
4722                 }
4723         }                       /* end if !SCTP_COOKIE_ECHO */
4724         /*
4725          * process all control chunks...
4726          */
4727         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4728             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4729             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4730             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
4731                 /* implied cookie-ack.. we must have lost the ack */
4732                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4733                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4734                             stcb->asoc.overall_error_count,
4735                             0,
4736                             SCTP_FROM_SCTP_INPUT,
4737                             __LINE__);
4738                 }
4739                 stcb->asoc.overall_error_count = 0;
4740                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4741                     *netp);
4742         }
4743 process_control_chunks:
4744         while (IS_SCTP_CONTROL(ch)) {
4745                 /* validate chunk length */
4746                 chk_length = ntohs(ch->chunk_length);
4747                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4748                     ch->chunk_type, chk_length);
4749                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4750                 if (chk_length < sizeof(*ch) ||
4751                     (*offset + (int)chk_length) > length) {
4752                         *offset = length;
4753                         if (locked_tcb) {
4754                                 SCTP_TCB_UNLOCK(locked_tcb);
4755                         }
4756                         return (NULL);
4757                 }
4758                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4759                 /*
4760                  * INIT-ACK only gets the init ack "header" portion only
4761                  * because we don't have to process the peer's COOKIE. All
4762                  * others get a complete chunk.
4763                  */
4764                 if ((ch->chunk_type == SCTP_INITIATION_ACK) ||
4765                     (ch->chunk_type == SCTP_INITIATION)) {
4766                         /* get an init-ack chunk */
4767                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4768                             sizeof(struct sctp_init_ack_chunk), chunk_buf);
4769                         if (ch == NULL) {
4770                                 *offset = length;
4771                                 if (locked_tcb) {
4772                                         SCTP_TCB_UNLOCK(locked_tcb);
4773                                 }
4774                                 return (NULL);
4775                         }
4776                 } else {
4777                         /* For cookies and all other chunks. */
4778                         if (chk_length > sizeof(chunk_buf)) {
4779                                 /*
4780                                  * use just the size of the chunk buffer so
4781                                  * the front part of our chunks fit in
4782                                  * contiguous space up to the chunk buffer
4783                                  * size (508 bytes). For chunks that need to
4784                                  * get more than that they must use the
4785                                  * sctp_m_getptr() function or other means
4786                                  * (e.g. know how to parse mbuf chains).
4787                                  * Cookies do this already.
4788                                  */
4789                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4790                                     (sizeof(chunk_buf) - 4),
4791                                     chunk_buf);
4792                                 if (ch == NULL) {
4793                                         *offset = length;
4794                                         if (locked_tcb) {
4795                                                 SCTP_TCB_UNLOCK(locked_tcb);
4796                                         }
4797                                         return (NULL);
4798                                 }
4799                         } else {
4800                                 /* We can fit it all */
4801                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4802                                     chk_length, chunk_buf);
4803                                 if (ch == NULL) {
4804                                         SCTP_PRINTF("sctp_process_control: Can't get the all data....\n");
4805                                         *offset = length;
4806                                         if (locked_tcb) {
4807                                                 SCTP_TCB_UNLOCK(locked_tcb);
4808                                         }
4809                                         return (NULL);
4810                                 }
4811                         }
4812                 }
4813                 num_chunks++;
4814                 /* Save off the last place we got a control from */
4815                 if (stcb != NULL) {
4816                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4817                                 /*
4818                                  * allow last_control to be NULL if
4819                                  * ASCONF... ASCONF processing will find the
4820                                  * right net later
4821                                  */
4822                                 if ((netp != NULL) && (*netp != NULL))
4823                                         stcb->asoc.last_control_chunk_from = *netp;
4824                         }
4825                 }
4826 #ifdef SCTP_AUDITING_ENABLED
4827                 sctp_audit_log(0xB0, ch->chunk_type);
4828 #endif
4829
4830                 /* check to see if this chunk required auth, but isn't */
4831                 if ((stcb != NULL) &&
4832                     (stcb->asoc.auth_supported == 1) &&
4833                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4834                     !stcb->asoc.authenticated) {
4835                         /* "silently" ignore */
4836                         SCTP_STAT_INCR(sctps_recvauthmissing);
4837                         goto next_chunk;
4838                 }
4839                 switch (ch->chunk_type) {
4840                 case SCTP_INITIATION:
4841                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4842                         /* The INIT chunk must be the only chunk. */
4843                         if ((num_chunks > 1) ||
4844                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4845                                 /* RFC 4960 requires that no ABORT is sent */
4846                                 *offset = length;
4847                                 if (locked_tcb) {
4848                                         SCTP_TCB_UNLOCK(locked_tcb);
4849                                 }
4850                                 return (NULL);
4851                         }
4852                         /* Honor our resource limit. */
4853                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4854                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4855                                 sctp_abort_association(inp, stcb, m, iphlen,
4856                                     src, dst, sh, op_err,
4857                                     mflowtype, mflowid,
4858                                     vrf_id, port);
4859                                 *offset = length;
4860                                 return (NULL);
4861                         }
4862                         sctp_handle_init(m, iphlen, *offset, src, dst, sh,
4863                             (struct sctp_init_chunk *)ch, inp,
4864                             stcb, *netp, &abort_no_unlock,
4865                             mflowtype, mflowid,
4866                             vrf_id, port);
4867                         *offset = length;
4868                         if ((!abort_no_unlock) && (locked_tcb)) {
4869                                 SCTP_TCB_UNLOCK(locked_tcb);
4870                         }
4871                         return (NULL);
4872                         break;
4873                 case SCTP_PAD_CHUNK:
4874                         break;
4875                 case SCTP_INITIATION_ACK:
4876                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n");
4877                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4878                                 /* We are not interested anymore */
4879                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4880                                         ;
4881                                 } else {
4882                                         if ((locked_tcb != NULL) && (locked_tcb != stcb)) {
4883                                                 /* Very unlikely */
4884                                                 SCTP_TCB_UNLOCK(locked_tcb);
4885                                         }
4886                                         *offset = length;
4887                                         if (stcb) {
4888 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4889                                                 so = SCTP_INP_SO(inp);
4890                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4891                                                 SCTP_TCB_UNLOCK(stcb);
4892                                                 SCTP_SOCKET_LOCK(so, 1);
4893                                                 SCTP_TCB_LOCK(stcb);
4894                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4895 #endif
4896                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
4897                                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
4898 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4899                                                 SCTP_SOCKET_UNLOCK(so, 1);
4900 #endif
4901                                         }
4902                                         return (NULL);
4903                                 }
4904                         }
4905                         /* The INIT-ACK chunk must be the only chunk. */
4906                         if ((num_chunks > 1) ||
4907                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4908                                 *offset = length;
4909                                 if (locked_tcb) {
4910                                         SCTP_TCB_UNLOCK(locked_tcb);
4911                                 }
4912                                 return (NULL);
4913                         }
4914                         if ((netp) && (*netp)) {
4915                                 ret = sctp_handle_init_ack(m, iphlen, *offset,
4916                                     src, dst, sh,
4917                                     (struct sctp_init_ack_chunk *)ch,
4918                                     stcb, *netp,
4919                                     &abort_no_unlock,
4920                                     mflowtype, mflowid,
4921                                     vrf_id);
4922                         } else {
4923                                 ret = -1;
4924                         }
4925                         *offset = length;
4926                         if (abort_no_unlock) {
4927                                 return (NULL);
4928                         }
4929                         /*
4930                          * Special case, I must call the output routine to
4931                          * get the cookie echoed
4932                          */
4933                         if ((stcb != NULL) && (ret == 0)) {
4934                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4935                         }
4936                         if (locked_tcb) {
4937                                 SCTP_TCB_UNLOCK(locked_tcb);
4938                         }
4939                         return (NULL);
4940                         break;
4941                 case SCTP_SELECTIVE_ACK:
4942                         {
4943                                 struct sctp_sack_chunk *sack;
4944                                 int abort_now = 0;
4945                                 uint32_t a_rwnd, cum_ack;
4946                                 uint16_t num_seg, num_dup;
4947                                 uint8_t flags;
4948                                 int offset_seg, offset_dup;
4949
4950                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n");
4951                                 SCTP_STAT_INCR(sctps_recvsacks);
4952                                 if (stcb == NULL) {
4953                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n");
4954                                         break;
4955                                 }
4956                                 if (chk_length < sizeof(struct sctp_sack_chunk)) {
4957                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4958                                         break;
4959                                 }
4960                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4961                                         /*-
4962                                          * If we have sent a shutdown-ack, we will pay no
4963                                          * attention to a sack sent in to us since
4964                                          * we don't care anymore.
4965                                          */
4966                                         break;
4967                                 }
4968                                 sack = (struct sctp_sack_chunk *)ch;
4969                                 flags = ch->chunk_flags;
4970                                 cum_ack = ntohl(sack->sack.cum_tsn_ack);
4971                                 num_seg = ntohs(sack->sack.num_gap_ack_blks);
4972                                 num_dup = ntohs(sack->sack.num_dup_tsns);
4973                                 a_rwnd = (uint32_t)ntohl(sack->sack.a_rwnd);
4974                                 if (sizeof(struct sctp_sack_chunk) +
4975                                     num_seg * sizeof(struct sctp_gap_ack_block) +
4976                                     num_dup * sizeof(uint32_t) != chk_length) {
4977                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4978                                         break;
4979                                 }
4980                                 offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4981                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4982                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4983                                     cum_ack, num_seg, a_rwnd);
4984                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4985                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4986                                     (num_seg == 0) &&
4987                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4988                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4989                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4990                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))
4991                                     ) {
4992                                         /*
4993                                          * We have a SIMPLE sack having no
4994                                          * prior segments and data on sent
4995                                          * queue to be acked.. Use the
4996                                          * faster path sack processing. We
4997                                          * also allow window update sacks
4998                                          * with no missing segments to go
4999                                          * this way too.
5000                                          */
5001                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen);
5002                                 } else {
5003                                         if (netp && *netp)
5004                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
5005                                                     num_seg, 0, num_dup, &abort_now, flags,
5006                                                     cum_ack, a_rwnd, ecne_seen);
5007                                 }
5008                                 if (abort_now) {
5009                                         /* ABORT signal from sack processing */
5010                                         *offset = length;
5011                                         return (NULL);
5012                                 }
5013                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
5014                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
5015                                     (stcb->asoc.stream_queue_cnt == 0)) {
5016                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
5017                                 }
5018                         }
5019                         break;
5020                         /*
5021                          * EY - nr_sack:  If the received chunk is an
5022                          * nr_sack chunk
5023                          */
5024                 case SCTP_NR_SELECTIVE_ACK:
5025                         {
5026                                 struct sctp_nr_sack_chunk *nr_sack;
5027                                 int abort_now = 0;
5028                                 uint32_t a_rwnd, cum_ack;
5029                                 uint16_t num_seg, num_nr_seg, num_dup;
5030                                 uint8_t flags;
5031                                 int offset_seg, offset_dup;
5032
5033                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n");
5034                                 SCTP_STAT_INCR(sctps_recvsacks);
5035                                 if (stcb == NULL) {
5036                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n");
5037                                         break;
5038                                 }
5039                                 if (stcb->asoc.nrsack_supported == 0) {
5040                                         goto unknown_chunk;
5041                                 }
5042                                 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
5043                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n");
5044                                         break;
5045                                 }
5046                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
5047                                         /*-
5048                                          * If we have sent a shutdown-ack, we will pay no
5049                                          * attention to a sack sent in to us since
5050                                          * we don't care anymore.
5051                                          */
5052                                         break;
5053                                 }
5054                                 nr_sack = (struct sctp_nr_sack_chunk *)ch;
5055                                 flags = ch->chunk_flags;
5056                                 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
5057                                 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
5058                                 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
5059                                 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
5060                                 a_rwnd = (uint32_t)ntohl(nr_sack->nr_sack.a_rwnd);
5061                                 if (sizeof(struct sctp_nr_sack_chunk) +
5062                                     (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
5063                                     num_dup * sizeof(uint32_t) != chk_length) {
5064                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
5065                                         break;
5066                                 }
5067                                 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
5068                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
5069                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
5070                                     cum_ack, num_seg, a_rwnd);
5071                                 stcb->asoc.seen_a_sack_this_pkt = 1;
5072                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
5073                                     (num_seg == 0) && (num_nr_seg == 0) &&
5074                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
5075                                     (stcb->asoc.saw_sack_with_frags == 0) &&
5076                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
5077                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
5078                                         /*
5079                                          * We have a SIMPLE sack having no
5080                                          * prior segments and data on sent
5081                                          * queue to be acked. Use the faster
5082                                          * path sack processing. We also
5083                                          * allow window update sacks with no
5084                                          * missing segments to go this way
5085                                          * too.
5086                                          */
5087                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
5088                                             &abort_now, ecne_seen);
5089                                 } else {
5090                                         if (netp && *netp)
5091                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
5092                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
5093                                                     cum_ack, a_rwnd, ecne_seen);
5094                                 }
5095                                 if (abort_now) {
5096                                         /* ABORT signal from sack processing */
5097                                         *offset = length;
5098                                         return (NULL);
5099                                 }
5100                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
5101                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
5102                                     (stcb->asoc.stream_queue_cnt == 0)) {
5103                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
5104                                 }
5105                         }
5106                         break;
5107
5108                 case SCTP_HEARTBEAT_REQUEST:
5109                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
5110                         if ((stcb) && netp && *netp) {
5111                                 SCTP_STAT_INCR(sctps_recvheartbeat);
5112                                 sctp_send_heartbeat_ack(stcb, m, *offset,
5113                                     chk_length, *netp);
5114
5115                                 /* He's alive so give him credit */
5116                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5117                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5118                                             stcb->asoc.overall_error_count,
5119                                             0,
5120                                             SCTP_FROM_SCTP_INPUT,
5121                                             __LINE__);
5122                                 }
5123                                 stcb->asoc.overall_error_count = 0;
5124                         }
5125                         break;
5126                 case SCTP_HEARTBEAT_ACK:
5127                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n");
5128                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
5129                                 /* Its not ours */
5130                                 *offset = length;
5131                                 if (locked_tcb) {
5132                                         SCTP_TCB_UNLOCK(locked_tcb);
5133                                 }
5134                                 return (NULL);
5135                         }
5136                         /* He's alive so give him credit */
5137                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5138                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5139                                     stcb->asoc.overall_error_count,
5140                                     0,
5141                                     SCTP_FROM_SCTP_INPUT,
5142                                     __LINE__);
5143                         }
5144                         stcb->asoc.overall_error_count = 0;
5145                         SCTP_STAT_INCR(sctps_recvheartbeatack);
5146                         if (netp && *netp)
5147                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
5148                                     stcb, *netp);
5149                         break;
5150                 case SCTP_ABORT_ASSOCIATION:
5151                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
5152                             (void *)stcb);
5153                         if ((stcb) && netp && *netp)
5154                                 sctp_handle_abort((struct sctp_abort_chunk *)ch,
5155                                     stcb, *netp);
5156                         *offset = length;
5157                         return (NULL);
5158                         break;
5159                 case SCTP_SHUTDOWN:
5160                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
5161                             (void *)stcb);
5162                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
5163                                 *offset = length;
5164                                 if (locked_tcb) {
5165                                         SCTP_TCB_UNLOCK(locked_tcb);
5166                                 }
5167                                 return (NULL);
5168                         }
5169                         if (netp && *netp) {
5170                                 int abort_flag = 0;
5171
5172                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
5173                                     stcb, *netp, &abort_flag);
5174                                 if (abort_flag) {
5175                                         *offset = length;
5176                                         return (NULL);
5177                                 }
5178                         }
5179                         break;
5180                 case SCTP_SHUTDOWN_ACK:
5181                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb);
5182                         if ((stcb) && (netp) && (*netp))
5183                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
5184                         *offset = length;
5185                         return (NULL);
5186                         break;
5187
5188                 case SCTP_OPERATION_ERROR:
5189                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n");
5190                         if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) {
5191                                 *offset = length;
5192                                 return (NULL);
5193                         }
5194                         break;
5195                 case SCTP_COOKIE_ECHO:
5196                         SCTPDBG(SCTP_DEBUG_INPUT3,
5197                             "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb);
5198                         if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5199                                 ;
5200                         } else {
5201                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5202                                         /* We are not interested anymore */
5203                         abend:
5204                                         if (stcb) {
5205                                                 SCTP_TCB_UNLOCK(stcb);
5206                                         }
5207                                         *offset = length;
5208                                         return (NULL);
5209                                 }
5210                         }
5211                         /*-
5212                          * First are we accepting? We do this again here
5213                          * since it is possible that a previous endpoint WAS
5214                          * listening responded to a INIT-ACK and then
5215                          * closed. We opened and bound.. and are now no
5216                          * longer listening.
5217                          *
5218                          * XXXGL: notes on checking listen queue length.
5219                          * 1) SCTP_IS_LISTENING() doesn't necessarily mean
5220                          *    SOLISTENING(), because a listening "UDP type"
5221                          *    socket isn't listening in terms of the socket
5222                          *    layer.  It is a normal data flow socket, that
5223                          *    can fork off new connections.  Thus, we should
5224                          *    look into sol_qlen only in case we are !UDP.
5225                          * 2) Checking sol_qlen in general requires locking
5226                          *    the socket, and this code lacks that.
5227                          */
5228                         if ((stcb == NULL) &&
5229                             (!SCTP_IS_LISTENING(inp) ||
5230                             (!(inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) &&
5231                             inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) {
5232                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
5233                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
5234                                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
5235                                         sctp_abort_association(inp, stcb, m, iphlen,
5236                                             src, dst, sh, op_err,
5237                                             mflowtype, mflowid,
5238                                             vrf_id, port);
5239                                 }
5240                                 *offset = length;
5241                                 return (NULL);
5242                         } else {
5243                                 struct mbuf *ret_buf;
5244                                 struct sctp_inpcb *linp;
5245
5246                                 if (stcb) {
5247                                         linp = NULL;
5248                                 } else {
5249                                         linp = inp;
5250                                 }
5251
5252                                 if (linp) {
5253                                         SCTP_ASOC_CREATE_LOCK(linp);
5254                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
5255                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
5256                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
5257                                                 goto abend;
5258                                         }
5259                                 }
5260                                 if (netp) {
5261                                         ret_buf =
5262                                             sctp_handle_cookie_echo(m, iphlen,
5263                                             *offset,
5264                                             src, dst,
5265                                             sh,
5266                                             (struct sctp_cookie_echo_chunk *)ch,
5267                                             &inp, &stcb, netp,
5268                                             auth_skipped,
5269                                             auth_offset,
5270                                             auth_len,
5271                                             &locked_tcb,
5272                                             mflowtype,
5273                                             mflowid,
5274                                             vrf_id,
5275                                             port);
5276                                 } else {
5277                                         ret_buf = NULL;
5278                                 }
5279                                 if (linp) {
5280                                         SCTP_ASOC_CREATE_UNLOCK(linp);
5281                                 }
5282                                 if (ret_buf == NULL) {
5283                                         if (locked_tcb) {
5284                                                 SCTP_TCB_UNLOCK(locked_tcb);
5285                                         }
5286                                         SCTPDBG(SCTP_DEBUG_INPUT3,
5287                                             "GAK, null buffer\n");
5288                                         *offset = length;
5289                                         return (NULL);
5290                                 }
5291                                 /* if AUTH skipped, see if it verified... */
5292                                 if (auth_skipped) {
5293                                         got_auth = 1;
5294                                         auth_skipped = 0;
5295                                 }
5296                                 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
5297                                         /*
5298                                          * Restart the timer if we have
5299                                          * pending data
5300                                          */
5301                                         struct sctp_tmit_chunk *chk;
5302
5303                                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
5304                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
5305                                 }
5306                         }
5307                         break;
5308                 case SCTP_COOKIE_ACK:
5309                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb);
5310                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5311                                 if (locked_tcb) {
5312                                         SCTP_TCB_UNLOCK(locked_tcb);
5313                                 }
5314                                 return (NULL);
5315                         }
5316                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5317                                 /* We are not interested anymore */
5318                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5319                                         ;
5320                                 } else if (stcb) {
5321 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5322                                         so = SCTP_INP_SO(inp);
5323                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5324                                         SCTP_TCB_UNLOCK(stcb);
5325                                         SCTP_SOCKET_LOCK(so, 1);
5326                                         SCTP_TCB_LOCK(stcb);
5327                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5328 #endif
5329                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5330                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
5331 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5332                                         SCTP_SOCKET_UNLOCK(so, 1);
5333 #endif
5334                                         *offset = length;
5335                                         return (NULL);
5336                                 }
5337                         }
5338                         /* He's alive so give him credit */
5339                         if ((stcb) && netp && *netp) {
5340                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5341                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5342                                             stcb->asoc.overall_error_count,
5343                                             0,
5344                                             SCTP_FROM_SCTP_INPUT,
5345                                             __LINE__);
5346                                 }
5347                                 stcb->asoc.overall_error_count = 0;
5348                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
5349                         }
5350                         break;
5351                 case SCTP_ECN_ECHO:
5352                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n");
5353                         /* He's alive so give him credit */
5354                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5355                                 /* Its not ours */
5356                                 if (locked_tcb) {
5357                                         SCTP_TCB_UNLOCK(locked_tcb);
5358                                 }
5359                                 *offset = length;
5360                                 return (NULL);
5361                         }
5362                         if (stcb) {
5363                                 if (stcb->asoc.ecn_supported == 0) {
5364                                         goto unknown_chunk;
5365                                 }
5366                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5367                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5368                                             stcb->asoc.overall_error_count,
5369                                             0,
5370                                             SCTP_FROM_SCTP_INPUT,
5371                                             __LINE__);
5372                                 }
5373                                 stcb->asoc.overall_error_count = 0;
5374                                 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch,
5375                                     stcb);
5376                                 ecne_seen = 1;
5377                         }
5378                         break;
5379                 case SCTP_ECN_CWR:
5380                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n");
5381                         /* He's alive so give him credit */
5382                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5383                                 /* Its not ours */
5384                                 if (locked_tcb) {
5385                                         SCTP_TCB_UNLOCK(locked_tcb);
5386                                 }
5387                                 *offset = length;
5388                                 return (NULL);
5389                         }
5390                         if (stcb) {
5391                                 if (stcb->asoc.ecn_supported == 0) {
5392                                         goto unknown_chunk;
5393                                 }
5394                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5395                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5396                                             stcb->asoc.overall_error_count,
5397                                             0,
5398                                             SCTP_FROM_SCTP_INPUT,
5399                                             __LINE__);
5400                                 }
5401                                 stcb->asoc.overall_error_count = 0;
5402                                 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5403                         }
5404                         break;
5405                 case SCTP_SHUTDOWN_COMPLETE:
5406                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb);
5407                         /* must be first and only chunk */
5408                         if ((num_chunks > 1) ||
5409                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5410                                 *offset = length;
5411                                 if (locked_tcb) {
5412                                         SCTP_TCB_UNLOCK(locked_tcb);
5413                                 }
5414                                 return (NULL);
5415                         }
5416                         if ((stcb) && netp && *netp) {
5417                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5418                                     stcb, *netp);
5419                         }
5420                         *offset = length;
5421                         return (NULL);
5422                         break;
5423                 case SCTP_ASCONF:
5424                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5425                         /* He's alive so give him credit */
5426                         if (stcb) {
5427                                 if (stcb->asoc.asconf_supported == 0) {
5428                                         goto unknown_chunk;
5429                                 }
5430                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5431                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5432                                             stcb->asoc.overall_error_count,
5433                                             0,
5434                                             SCTP_FROM_SCTP_INPUT,
5435                                             __LINE__);
5436                                 }
5437                                 stcb->asoc.overall_error_count = 0;
5438                                 sctp_handle_asconf(m, *offset, src,
5439                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5440                                 asconf_cnt++;
5441                         }
5442                         break;
5443                 case SCTP_ASCONF_ACK:
5444                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n");
5445                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5446                                 /* Its not ours */
5447                                 if (locked_tcb) {
5448                                         SCTP_TCB_UNLOCK(locked_tcb);
5449                                 }
5450                                 *offset = length;
5451                                 return (NULL);
5452                         }
5453                         if ((stcb) && netp && *netp) {
5454                                 if (stcb->asoc.asconf_supported == 0) {
5455                                         goto unknown_chunk;
5456                                 }
5457                                 /* He's alive so give him credit */
5458                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5459                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5460                                             stcb->asoc.overall_error_count,
5461                                             0,
5462                                             SCTP_FROM_SCTP_INPUT,
5463                                             __LINE__);
5464                                 }
5465                                 stcb->asoc.overall_error_count = 0;
5466                                 sctp_handle_asconf_ack(m, *offset,
5467                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5468                                 if (abort_no_unlock)
5469                                         return (NULL);
5470                         }
5471                         break;
5472                 case SCTP_FORWARD_CUM_TSN:
5473                 case SCTP_IFORWARD_CUM_TSN:
5474                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n");
5475                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5476                                 /* Its not ours */
5477                                 if (locked_tcb) {
5478                                         SCTP_TCB_UNLOCK(locked_tcb);
5479                                 }
5480                                 *offset = length;
5481                                 return (NULL);
5482                         }
5483                         /* He's alive so give him credit */
5484                         if (stcb) {
5485                                 int abort_flag = 0;
5486
5487                                 if (stcb->asoc.prsctp_supported == 0) {
5488                                         goto unknown_chunk;
5489                                 }
5490                                 stcb->asoc.overall_error_count = 0;
5491                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5492                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5493                                             stcb->asoc.overall_error_count,
5494                                             0,
5495                                             SCTP_FROM_SCTP_INPUT,
5496                                             __LINE__);
5497                                 }
5498                                 *fwd_tsn_seen = 1;
5499                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5500                                         /* We are not interested anymore */
5501 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5502                                         so = SCTP_INP_SO(inp);
5503                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5504                                         SCTP_TCB_UNLOCK(stcb);
5505                                         SCTP_SOCKET_LOCK(so, 1);
5506                                         SCTP_TCB_LOCK(stcb);
5507                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5508 #endif
5509                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5510                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_31);
5511 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5512                                         SCTP_SOCKET_UNLOCK(so, 1);
5513 #endif
5514                                         *offset = length;
5515                                         return (NULL);
5516                                 }
5517                                 /*
5518                                  * For sending a SACK this looks like DATA
5519                                  * chunks.
5520                                  */
5521                                 stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from;
5522                                 sctp_handle_forward_tsn(stcb,
5523                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5524                                 if (abort_flag) {
5525                                         *offset = length;
5526                                         return (NULL);
5527                                 } else {
5528                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5529                                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5530                                                     stcb->asoc.overall_error_count,
5531                                                     0,
5532                                                     SCTP_FROM_SCTP_INPUT,
5533                                                     __LINE__);
5534                                         }
5535                                         stcb->asoc.overall_error_count = 0;
5536                                 }
5537
5538                         }
5539                         break;
5540                 case SCTP_STREAM_RESET:
5541                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5542                         if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
5543                                 /* Its not ours */
5544                                 if (locked_tcb) {
5545                                         SCTP_TCB_UNLOCK(locked_tcb);
5546                                 }
5547                                 *offset = length;
5548                                 return (NULL);
5549                         }
5550                         if (stcb->asoc.reconfig_supported == 0) {
5551                                 goto unknown_chunk;
5552                         }
5553                         if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5554                                 /* stop processing */
5555                                 *offset = length;
5556                                 return (NULL);
5557                         }
5558                         break;
5559                 case SCTP_PACKET_DROPPED:
5560                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5561                         /* re-get it all please */
5562                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5563                                 /* Its not ours */
5564                                 if (locked_tcb) {
5565                                         SCTP_TCB_UNLOCK(locked_tcb);
5566                                 }
5567                                 *offset = length;
5568                                 return (NULL);
5569                         }
5570                         if (ch && (stcb) && netp && (*netp)) {
5571                                 if (stcb->asoc.pktdrop_supported == 0) {
5572                                         goto unknown_chunk;
5573                                 }
5574                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5575                                     stcb, *netp,
5576                                     min(chk_length, (sizeof(chunk_buf) - 4)));
5577
5578                         }
5579                         break;
5580                 case SCTP_AUTHENTICATION:
5581                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5582                         if (stcb == NULL) {
5583                                 /* save the first AUTH for later processing */
5584                                 if (auth_skipped == 0) {
5585                                         auth_offset = *offset;
5586                                         auth_len = chk_length;
5587                                         auth_skipped = 1;
5588                                 }
5589                                 /* skip this chunk (temporarily) */
5590                                 goto next_chunk;
5591                         }
5592                         if (stcb->asoc.auth_supported == 0) {
5593                                 goto unknown_chunk;
5594                         }
5595                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5596                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5597                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5598                                 /* Its not ours */
5599                                 if (locked_tcb) {
5600                                         SCTP_TCB_UNLOCK(locked_tcb);
5601                                 }
5602                                 *offset = length;
5603                                 return (NULL);
5604                         }
5605                         if (got_auth == 1) {
5606                                 /* skip this chunk... it's already auth'd */
5607                                 goto next_chunk;
5608                         }
5609                         got_auth = 1;
5610                         if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
5611                             m, *offset)) {
5612                                 /* auth HMAC failed so dump the packet */
5613                                 *offset = length;
5614                                 return (stcb);
5615                         } else {
5616                                 /* remaining chunks are HMAC checked */
5617                                 stcb->asoc.authenticated = 1;
5618                         }
5619                         break;
5620
5621                 default:
5622         unknown_chunk:
5623                         /* it's an unknown chunk! */
5624                         if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
5625                                 struct sctp_gen_error_cause *cause;
5626                                 int len;
5627
5628                                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause),
5629                                     0, M_NOWAIT, 1, MT_DATA);
5630                                 if (op_err != NULL) {
5631                                         len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset));
5632                                         cause = mtod(op_err, struct sctp_gen_error_cause *);
5633                                         cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5634                                         cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause)));
5635                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5636                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
5637                                         if (SCTP_BUF_NEXT(op_err) != NULL) {
5638 #ifdef SCTP_MBUF_LOGGING
5639                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5640                                                         sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY);
5641                                                 }
5642 #endif
5643                                                 sctp_queue_op_err(stcb, op_err);
5644                                         } else {
5645                                                 sctp_m_freem(op_err);
5646                                         }
5647                                 }
5648                         }
5649                         if ((ch->chunk_type & 0x80) == 0) {
5650                                 /* discard this packet */
5651                                 *offset = length;
5652                                 return (stcb);
5653                         }       /* else skip this bad chunk and continue... */
5654                         break;
5655                 }               /* switch (ch->chunk_type) */
5656
5657
5658 next_chunk:
5659                 /* get the next chunk */
5660                 *offset += SCTP_SIZE32(chk_length);
5661                 if (*offset >= length) {
5662                         /* no more data left in the mbuf chain */
5663                         break;
5664                 }
5665                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5666                     sizeof(struct sctp_chunkhdr), chunk_buf);
5667                 if (ch == NULL) {
5668                         if (locked_tcb) {
5669                                 SCTP_TCB_UNLOCK(locked_tcb);
5670                         }
5671                         *offset = length;
5672                         return (NULL);
5673                 }
5674         }                       /* while */
5675
5676         if (asconf_cnt > 0 && stcb != NULL) {
5677                 sctp_send_asconf_ack(stcb);
5678         }
5679         return (stcb);
5680 }
5681
5682
5683 /*
5684  * common input chunk processing (v4 and v6)
5685  */
5686 void
5687 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5688     struct sockaddr *src, struct sockaddr *dst,
5689     struct sctphdr *sh, struct sctp_chunkhdr *ch,
5690 #if !defined(SCTP_WITH_NO_CSUM)
5691     uint8_t compute_crc,
5692 #endif
5693     uint8_t ecn_bits,
5694     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
5695     uint32_t vrf_id, uint16_t port)
5696 {
5697         uint32_t high_tsn;
5698         int fwd_tsn_seen = 0, data_processed = 0;
5699         struct mbuf *m = *mm, *op_err;
5700         char msg[SCTP_DIAG_INFO_LEN];
5701         int un_sent;
5702         int cnt_ctrl_ready = 0;
5703         struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5704         struct sctp_tcb *stcb = NULL;
5705         struct sctp_nets *net = NULL;
5706
5707         SCTP_STAT_INCR(sctps_recvdatagrams);
5708 #ifdef SCTP_AUDITING_ENABLED
5709         sctp_audit_log(0xE0, 1);
5710         sctp_auditing(0, inp, stcb, net);
5711 #endif
5712 #if !defined(SCTP_WITH_NO_CSUM)
5713         if (compute_crc != 0) {
5714                 uint32_t check, calc_check;
5715
5716                 check = sh->checksum;
5717                 sh->checksum = 0;
5718                 calc_check = sctp_calculate_cksum(m, iphlen);
5719                 sh->checksum = check;
5720                 if (calc_check != check) {
5721                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5722                             calc_check, check, (void *)m, length, iphlen);
5723                         stcb = sctp_findassociation_addr(m, offset, src, dst,
5724                             sh, ch, &inp, &net, vrf_id);
5725 #if defined(INET) || defined(INET6)
5726                         if ((ch->chunk_type != SCTP_INITIATION) &&
5727                             (net != NULL) && (net->port != port)) {
5728                                 if (net->port == 0) {
5729                                         /* UDP encapsulation turned on. */
5730                                         net->mtu -= sizeof(struct udphdr);
5731                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5732                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5733                                         }
5734                                 } else if (port == 0) {
5735                                         /* UDP encapsulation turned off. */
5736                                         net->mtu += sizeof(struct udphdr);
5737                                         /* XXX Update smallest_mtu */
5738                                 }
5739                                 net->port = port;
5740                         }
5741 #endif
5742                         if (net != NULL) {
5743                                 net->flowtype = mflowtype;
5744                                 net->flowid = mflowid;
5745                         }
5746                         if ((inp != NULL) && (stcb != NULL)) {
5747                                 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5748                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5749                         } else if ((inp != NULL) && (stcb == NULL)) {
5750                                 inp_decr = inp;
5751                         }
5752                         SCTP_STAT_INCR(sctps_badsum);
5753                         SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5754                         goto out;
5755                 }
5756         }
5757 #endif
5758         /* Destination port of 0 is illegal, based on RFC4960. */
5759         if (sh->dest_port == 0) {
5760                 SCTP_STAT_INCR(sctps_hdrops);
5761                 goto out;
5762         }
5763         stcb = sctp_findassociation_addr(m, offset, src, dst,
5764             sh, ch, &inp, &net, vrf_id);
5765 #if defined(INET) || defined(INET6)
5766         if ((ch->chunk_type != SCTP_INITIATION) &&
5767             (net != NULL) && (net->port != port)) {
5768                 if (net->port == 0) {
5769                         /* UDP encapsulation turned on. */
5770                         net->mtu -= sizeof(struct udphdr);
5771                         if (stcb->asoc.smallest_mtu > net->mtu) {
5772                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5773                         }
5774                 } else if (port == 0) {
5775                         /* UDP encapsulation turned off. */
5776                         net->mtu += sizeof(struct udphdr);
5777                         /* XXX Update smallest_mtu */
5778                 }
5779                 net->port = port;
5780         }
5781 #endif
5782         if (net != NULL) {
5783                 net->flowtype = mflowtype;
5784                 net->flowid = mflowid;
5785         }
5786         if (inp == NULL) {
5787                 SCTP_STAT_INCR(sctps_noport);
5788                 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5789                         goto out;
5790                 }
5791                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5792                         sctp_send_shutdown_complete2(src, dst, sh,
5793                             mflowtype, mflowid, fibnum,
5794                             vrf_id, port);
5795                         goto out;
5796                 }
5797                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5798                         goto out;
5799                 }
5800                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5801                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5802                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5803                             (ch->chunk_type != SCTP_INIT))) {
5804                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5805                                     "Out of the blue");
5806                                 sctp_send_abort(m, iphlen, src, dst,
5807                                     sh, 0, op_err,
5808                                     mflowtype, mflowid, fibnum,
5809                                     vrf_id, port);
5810                         }
5811                 }
5812                 goto out;
5813         } else if (stcb == NULL) {
5814                 inp_decr = inp;
5815         }
5816         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5817             (void *)m, iphlen, offset, length, (void *)stcb);
5818         if (stcb) {
5819                 /* always clear this before beginning a packet */
5820                 stcb->asoc.authenticated = 0;
5821                 stcb->asoc.seen_a_sack_this_pkt = 0;
5822                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5823                     (void *)stcb, stcb->asoc.state);
5824
5825                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5826                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5827                         /*-
5828                          * If we hit here, we had a ref count
5829                          * up when the assoc was aborted and the
5830                          * timer is clearing out the assoc, we should
5831                          * NOT respond to any packet.. its OOTB.
5832                          */
5833                         SCTP_TCB_UNLOCK(stcb);
5834                         stcb = NULL;
5835                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5836                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5837                             msg);
5838                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5839                             mflowtype, mflowid, inp->fibnum,
5840                             vrf_id, port);
5841                         goto out;
5842                 }
5843         }
5844         if (IS_SCTP_CONTROL(ch)) {
5845                 /* process the control portion of the SCTP packet */
5846                 /* sa_ignore NO_NULL_CHK */
5847                 stcb = sctp_process_control(m, iphlen, &offset, length,
5848                     src, dst, sh, ch,
5849                     inp, stcb, &net, &fwd_tsn_seen,
5850                     mflowtype, mflowid, fibnum,
5851                     vrf_id, port);
5852                 if (stcb) {
5853                         /*
5854                          * This covers us if the cookie-echo was there and
5855                          * it changes our INP.
5856                          */
5857                         inp = stcb->sctp_ep;
5858 #if defined(INET) || defined(INET6)
5859                         if ((ch->chunk_type != SCTP_INITIATION) &&
5860                             (net != NULL) && (net->port != port)) {
5861                                 if (net->port == 0) {
5862                                         /* UDP encapsulation turned on. */
5863                                         net->mtu -= sizeof(struct udphdr);
5864                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5865                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5866                                         }
5867                                 } else if (port == 0) {
5868                                         /* UDP encapsulation turned off. */
5869                                         net->mtu += sizeof(struct udphdr);
5870                                         /* XXX Update smallest_mtu */
5871                                 }
5872                                 net->port = port;
5873                         }
5874 #endif
5875                 }
5876         } else {
5877                 /*
5878                  * no control chunks, so pre-process DATA chunks (these
5879                  * checks are taken care of by control processing)
5880                  */
5881
5882                 /*
5883                  * if DATA only packet, and auth is required, then punt...
5884                  * can't have authenticated without any AUTH (control)
5885                  * chunks
5886                  */
5887                 if ((stcb != NULL) &&
5888                     (stcb->asoc.auth_supported == 1) &&
5889                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5890                         /* "silently" ignore */
5891                         SCTP_STAT_INCR(sctps_recvauthmissing);
5892                         goto out;
5893                 }
5894                 if (stcb == NULL) {
5895                         /* out of the blue DATA chunk */
5896                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5897                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5898                             msg);
5899                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5900                             mflowtype, mflowid, fibnum,
5901                             vrf_id, port);
5902                         goto out;
5903                 }
5904                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5905                         /* v_tag mismatch! */
5906                         SCTP_STAT_INCR(sctps_badvtag);
5907                         goto out;
5908                 }
5909         }
5910
5911         if (stcb == NULL) {
5912                 /*
5913                  * no valid TCB for this packet, or we found it's a bad
5914                  * packet while processing control, or we're done with this
5915                  * packet (done or skip rest of data), so we drop it...
5916                  */
5917                 goto out;
5918         }
5919         /*
5920          * DATA chunk processing
5921          */
5922         /* plow through the data chunks while length > offset */
5923
5924         /*
5925          * Rest should be DATA only.  Check authentication state if AUTH for
5926          * DATA is required.
5927          */
5928         if ((length > offset) &&
5929             (stcb != NULL) &&
5930             (stcb->asoc.auth_supported == 1) &&
5931             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5932             !stcb->asoc.authenticated) {
5933                 /* "silently" ignore */
5934                 SCTP_STAT_INCR(sctps_recvauthmissing);
5935                 SCTPDBG(SCTP_DEBUG_AUTH1,
5936                     "Data chunk requires AUTH, skipped\n");
5937                 goto trigger_send;
5938         }
5939         if (length > offset) {
5940                 int retval;
5941
5942                 /*
5943                  * First check to make sure our state is correct. We would
5944                  * not get here unless we really did have a tag, so we don't
5945                  * abort if this happens, just dump the chunk silently.
5946                  */
5947                 switch (SCTP_GET_STATE(&stcb->asoc)) {
5948                 case SCTP_STATE_COOKIE_ECHOED:
5949                         /*
5950                          * we consider data with valid tags in this state
5951                          * shows us the cookie-ack was lost. Imply it was
5952                          * there.
5953                          */
5954                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5955                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5956                                     stcb->asoc.overall_error_count,
5957                                     0,
5958                                     SCTP_FROM_SCTP_INPUT,
5959                                     __LINE__);
5960                         }
5961                         stcb->asoc.overall_error_count = 0;
5962                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5963                         break;
5964                 case SCTP_STATE_COOKIE_WAIT:
5965                         /*
5966                          * We consider OOTB any data sent during asoc setup.
5967                          */
5968                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5969                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5970                             msg);
5971                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5972                             mflowtype, mflowid, inp->fibnum,
5973                             vrf_id, port);
5974                         goto out;
5975                         /* sa_ignore NOTREACHED */
5976                         break;
5977                 case SCTP_STATE_EMPTY:  /* should not happen */
5978                 case SCTP_STATE_INUSE:  /* should not happen */
5979                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5980                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5981                 default:
5982                         goto out;
5983                         /* sa_ignore NOTREACHED */
5984                         break;
5985                 case SCTP_STATE_OPEN:
5986                 case SCTP_STATE_SHUTDOWN_SENT:
5987                         break;
5988                 }
5989                 /* plow through the data chunks while length > offset */
5990                 retval = sctp_process_data(mm, iphlen, &offset, length,
5991                     inp, stcb, net, &high_tsn);
5992                 if (retval == 2) {
5993                         /*
5994                          * The association aborted, NO UNLOCK needed since
5995                          * the association is destroyed.
5996                          */
5997                         stcb = NULL;
5998                         goto out;
5999                 }
6000                 data_processed = 1;
6001                 /*
6002                  * Anything important needs to have been m_copy'ed in
6003                  * process_data
6004                  */
6005         }
6006         /* take care of ecn */
6007         if ((data_processed == 1) &&
6008             (stcb->asoc.ecn_supported == 1) &&
6009             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
6010                 /* Yep, we need to add a ECNE */
6011                 sctp_send_ecn_echo(stcb, net, high_tsn);
6012         }
6013         if ((data_processed == 0) && (fwd_tsn_seen)) {
6014                 int was_a_gap;
6015                 uint32_t highest_tsn;
6016
6017                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
6018                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
6019                 } else {
6020                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
6021                 }
6022                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
6023                 stcb->asoc.send_sack = 1;
6024                 sctp_sack_check(stcb, was_a_gap);
6025         } else if (fwd_tsn_seen) {
6026                 stcb->asoc.send_sack = 1;
6027         }
6028         /* trigger send of any chunks in queue... */
6029 trigger_send:
6030 #ifdef SCTP_AUDITING_ENABLED
6031         sctp_audit_log(0xE0, 2);
6032         sctp_auditing(1, inp, stcb, net);
6033 #endif
6034         SCTPDBG(SCTP_DEBUG_INPUT1,
6035             "Check for chunk output prw:%d tqe:%d tf=%d\n",
6036             stcb->asoc.peers_rwnd,
6037             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
6038             stcb->asoc.total_flight);
6039         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
6040         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
6041                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
6042         }
6043         if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) ||
6044             cnt_ctrl_ready ||
6045             stcb->asoc.trigger_reset ||
6046             ((un_sent) &&
6047             (stcb->asoc.peers_rwnd > 0 ||
6048             (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
6049                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
6050                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
6051                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
6052         }
6053 #ifdef SCTP_AUDITING_ENABLED
6054         sctp_audit_log(0xE0, 3);
6055         sctp_auditing(2, inp, stcb, net);
6056 #endif
6057 out:
6058         if (stcb != NULL) {
6059                 SCTP_TCB_UNLOCK(stcb);
6060         }
6061         if (inp_decr != NULL) {
6062                 /* reduce ref-count */
6063                 SCTP_INP_WLOCK(inp_decr);
6064                 SCTP_INP_DECR_REF(inp_decr);
6065                 SCTP_INP_WUNLOCK(inp_decr);
6066         }
6067         return;
6068 }
6069
6070 #ifdef INET
6071 void
6072 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
6073 {
6074         struct mbuf *m;
6075         int iphlen;
6076         uint32_t vrf_id = 0;
6077         uint8_t ecn_bits;
6078         struct sockaddr_in src, dst;
6079         struct ip *ip;
6080         struct sctphdr *sh;
6081         struct sctp_chunkhdr *ch;
6082         int length, offset;
6083 #if !defined(SCTP_WITH_NO_CSUM)
6084         uint8_t compute_crc;
6085 #endif
6086         uint32_t mflowid;
6087         uint8_t mflowtype;
6088         uint16_t fibnum;
6089
6090         iphlen = off;
6091         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
6092                 SCTP_RELEASE_PKT(i_pak);
6093                 return;
6094         }
6095         m = SCTP_HEADER_TO_CHAIN(i_pak);
6096 #ifdef SCTP_MBUF_LOGGING
6097         /* Log in any input mbufs */
6098         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6099                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
6100         }
6101 #endif
6102 #ifdef SCTP_PACKET_LOGGING
6103         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
6104                 sctp_packet_log(m);
6105         }
6106 #endif
6107         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
6108             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
6109             m->m_pkthdr.len,
6110             if_name(m->m_pkthdr.rcvif),
6111             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
6112         mflowid = m->m_pkthdr.flowid;
6113         mflowtype = M_HASHTYPE_GET(m);
6114         fibnum = M_GETFIB(m);
6115         SCTP_STAT_INCR(sctps_recvpackets);
6116         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
6117         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
6118         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
6119         if (SCTP_BUF_LEN(m) < offset) {
6120                 if ((m = m_pullup(m, offset)) == NULL) {
6121                         SCTP_STAT_INCR(sctps_hdrops);
6122                         return;
6123                 }
6124         }
6125         ip = mtod(m, struct ip *);
6126         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
6127         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
6128         offset -= sizeof(struct sctp_chunkhdr);
6129         memset(&src, 0, sizeof(struct sockaddr_in));
6130         src.sin_family = AF_INET;
6131         src.sin_len = sizeof(struct sockaddr_in);
6132         src.sin_port = sh->src_port;
6133         src.sin_addr = ip->ip_src;
6134         memset(&dst, 0, sizeof(struct sockaddr_in));
6135         dst.sin_family = AF_INET;
6136         dst.sin_len = sizeof(struct sockaddr_in);
6137         dst.sin_port = sh->dest_port;
6138         dst.sin_addr = ip->ip_dst;
6139         length = ntohs(ip->ip_len);
6140         /* Validate mbuf chain length with IP payload length. */
6141         if (SCTP_HEADER_LEN(m) != length) {
6142                 SCTPDBG(SCTP_DEBUG_INPUT1,
6143                     "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
6144                 SCTP_STAT_INCR(sctps_hdrops);
6145                 goto out;
6146         }
6147         /* SCTP does not allow broadcasts or multicasts */
6148         if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
6149                 goto out;
6150         }
6151         if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
6152                 goto out;
6153         }
6154         ecn_bits = ip->ip_tos;
6155 #if defined(SCTP_WITH_NO_CSUM)
6156         SCTP_STAT_INCR(sctps_recvnocrc);
6157 #else
6158         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
6159                 SCTP_STAT_INCR(sctps_recvhwcrc);
6160                 compute_crc = 0;
6161         } else {
6162                 SCTP_STAT_INCR(sctps_recvswcrc);
6163                 compute_crc = 1;
6164         }
6165 #endif
6166         sctp_common_input_processing(&m, iphlen, offset, length,
6167             (struct sockaddr *)&src,
6168             (struct sockaddr *)&dst,
6169             sh, ch,
6170 #if !defined(SCTP_WITH_NO_CSUM)
6171             compute_crc,
6172 #endif
6173             ecn_bits,
6174             mflowtype, mflowid, fibnum,
6175             vrf_id, port);
6176 out:
6177         if (m) {
6178                 sctp_m_freem(m);
6179         }
6180         return;
6181 }
6182
6183 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6184 extern int *sctp_cpuarry;
6185 #endif
6186
6187 int
6188 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED)
6189 {
6190         struct mbuf *m;
6191         int off;
6192
6193         m = *mp;
6194         off = *offp;
6195 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6196         if (mp_ncpus > 1) {
6197                 struct ip *ip;
6198                 struct sctphdr *sh;
6199                 int offset;
6200                 int cpu_to_use;
6201                 uint32_t flowid, tag;
6202
6203                 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
6204                         flowid = m->m_pkthdr.flowid;
6205                 } else {
6206                         /*
6207                          * No flow id built by lower layers fix it so we
6208                          * create one.
6209                          */
6210                         offset = off + sizeof(struct sctphdr);
6211                         if (SCTP_BUF_LEN(m) < offset) {
6212                                 if ((m = m_pullup(m, offset)) == NULL) {
6213                                         SCTP_STAT_INCR(sctps_hdrops);
6214                                         return (IPPROTO_DONE);
6215                                 }
6216                         }
6217                         ip = mtod(m, struct ip *);
6218                         sh = (struct sctphdr *)((caddr_t)ip + off);
6219                         tag = htonl(sh->v_tag);
6220                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
6221                         m->m_pkthdr.flowid = flowid;
6222                         M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH);
6223                 }
6224                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
6225                 sctp_queue_to_mcore(m, off, cpu_to_use);
6226                 return (IPPROTO_DONE);
6227         }
6228 #endif
6229         sctp_input_with_port(m, off, 0);
6230         return (IPPROTO_DONE);
6231 }
6232 #endif