sys/netinet/sctp_input.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   5  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   6  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  * a) Redistributions of source code must retain the above copyright notice,
  12  *    this list of conditions and the following disclaimer.
  13  *
  14  * b) Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the distribution.
  17  *
  18  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  19  *    contributors may be used to endorse or promote products derived
  20  *    from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  24  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  32  * THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 __FBSDID("$FreeBSD$");
  37
  38 #include <netinet/sctp_os.h>
  39 #include <netinet/sctp_var.h>
  40 #include <netinet/sctp_sysctl.h>
  41 #include <netinet/sctp_pcb.h>
  42 #include <netinet/sctp_header.h>
  43 #include <netinet/sctputil.h>
  44 #include <netinet/sctp_output.h>
  45 #include <netinet/sctp_input.h>
  46 #include <netinet/sctp_auth.h>
  47 #include <netinet/sctp_indata.h>
  48 #include <netinet/sctp_asconf.h>
  49 #include <netinet/sctp_bsd_addr.h>
  50 #include <netinet/sctp_timer.h>
  51 #include <netinet/sctp_crc32.h>
  52 #include <netinet/sctp_kdtrace.h>
  53 #if defined(INET) || defined(INET6)
  54 #include <netinet/udp.h>
  55 #endif
  56 #include <sys/smp.h>
  57
  58 static void
  59 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb)
  60 {
  61         struct sctp_nets *net;
  62
  63         /*
  64          * This now not only stops all cookie timers it also stops any INIT
  65          * timers as well. This will make sure that the timers are stopped
  66          * in all collision cases.
  67          */
  68         SCTP_TCB_LOCK_ASSERT(stcb);
  69         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
  70                 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) {
  71                         sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE,
  72                             stcb->sctp_ep,
  73                             stcb,
  74                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1);
  75                 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) {
  76                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT,
  77                             stcb->sctp_ep,
  78                             stcb,
  79                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2);
  80                 }
  81         }
  82 }
  83
  84 /* INIT handler */
  85 static void
  86 sctp_handle_init(struct mbuf *m, int iphlen, int offset,
  87     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
  88     struct sctp_init_chunk *cp, struct sctp_inpcb *inp,
  89     struct sctp_tcb *stcb, struct sctp_nets *net,
  90     uint8_t mflowtype, uint32_t mflowid,
  91     uint32_t vrf_id, uint16_t port)
  92 {
  93         struct sctp_init *init;
  94         struct mbuf *op_err;
  95
  96         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
  97             (void *)stcb);
  98         if (stcb == NULL) {
  99                 SCTP_INP_RLOCK(inp);
 100         }
 101         /* Validate parameters */
 102         init = &cp->init;
 103         if (ntohl(init->initiate_tag) == 0) {
 104                 goto outnow;
 105         }
 106         if ((ntohl(init->a_rwnd) < SCTP_MIN_RWND) ||
 107             (ntohs(init->num_inbound_streams) == 0) ||
 108             (ntohs(init->num_outbound_streams) == 0)) {
 109                 /* protocol error... send abort */
 110                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 111                 sctp_send_abort(m, iphlen, src, dst, sh, init->initiate_tag, op_err,
 112                     mflowtype, mflowid, inp->fibnum,
 113                     vrf_id, port);
 114                 goto outnow;
 115         }
 116         if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
 117             offset + ntohs(cp->ch.chunk_length))) {
 118                 /* auth parameter(s) error... send abort */
 119                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 120                     "Problem with AUTH parameters");
 121                 sctp_send_abort(m, iphlen, src, dst, sh, init->initiate_tag, op_err,
 122                     mflowtype, mflowid, inp->fibnum,
 123                     vrf_id, port);
 124                 goto outnow;
 125         }
 126         /* We are only accepting if we have a listening socket. */
 127         if ((stcb == NULL) &&
 128             ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
 129             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
 130             (!SCTP_IS_LISTENING(inp)))) {
 131                 /*
 132                  * FIX ME ?? What about TCP model and we have a
 133                  * match/restart case? Actually no fix is needed. the lookup
 134                  * will always find the existing assoc so stcb would not be
 135                  * NULL. It may be questionable to do this since we COULD
 136                  * just send back the INIT-ACK and hope that the app did
 137                  * accept()'s by the time the COOKIE was sent. But there is
 138                  * a price to pay for COOKIE generation and I don't want to
 139                  * pay it on the chance that the app will actually do some
 140                  * accepts(). The App just looses and should NOT be in this
 141                  * state :-)
 142                  */
 143                 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) {
 144                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 145                             "No listener");
 146                         sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
 147                             mflowtype, mflowid, inp->fibnum,
 148                             vrf_id, port);
 149                 }
 150                 goto outnow;
 151         }
 152         if ((stcb != NULL) &&
 153             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 154                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n");
 155                 sctp_send_shutdown_ack(stcb, NULL);
 156                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
 157         } else {
 158                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
 159                 sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset,
 160                     src, dst, sh, cp,
 161                     mflowtype, mflowid,
 162                     vrf_id, port);
 163         }
 164 outnow:
 165         if (stcb == NULL) {
 166                 SCTP_INP_RUNLOCK(inp);
 167         }
 168 }
 169
 170 /*
 171  * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
 172  */
 173
 174 int
 175 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked)
 176 {
 177         int unsent_data;
 178         unsigned int i;
 179         struct sctp_stream_queue_pending *sp;
 180         struct sctp_association *asoc;
 181
 182         SCTP_TCB_LOCK_ASSERT(stcb);
 183
 184         /*
 185          * This function returns if any stream has true unsent data on it.
 186          * Note that as it looks through it will clean up any places that
 187          * have old data that has been sent but left at top of stream queue.
 188          */
 189         asoc = &stcb->asoc;
 190         unsent_data = 0;
 191         if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
 192                 /* Check to see if some data queued */
 193                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 194                         /* sa_ignore FREED_MEMORY */
 195                         sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
 196                         if (sp == NULL) {
 197                                 continue;
 198                         }
 199                         if ((sp->msg_is_complete) &&
 200                             (sp->length == 0) &&
 201                             (sp->sender_all_done)) {
 202                                 /*
 203                                  * We are doing differed cleanup. Last time
 204                                  * through when we took all the data the
 205                                  * sender_all_done was not set.
 206                                  */
 207                                 if (sp->put_last_out == 0) {
 208                                         SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
 209                                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
 210                                             sp->sender_all_done,
 211                                             sp->length,
 212                                             sp->msg_is_complete,
 213                                             sp->put_last_out);
 214                                 }
 215                                 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 216                                 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
 217                                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp);
 218                                 if (sp->net) {
 219                                         sctp_free_remote_addr(sp->net);
 220                                         sp->net = NULL;
 221                                 }
 222                                 if (sp->data) {
 223                                         sctp_m_freem(sp->data);
 224                                         sp->data = NULL;
 225                                 }
 226                                 sctp_free_a_strmoq(stcb, sp, so_locked);
 227                                 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
 228                                         unsent_data++;
 229                                 }
 230                         } else {
 231                                 unsent_data++;
 232                         }
 233                         if (unsent_data > 0) {
 234                                 break;
 235                         }
 236                 }
 237         }
 238         return (unsent_data);
 239 }
 240
 241 static int
 242 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb)
 243 {
 244         struct sctp_init *init;
 245         struct sctp_association *asoc;
 246         struct sctp_nets *lnet;
 247         unsigned int i;
 248
 249         SCTP_TCB_LOCK_ASSERT(stcb);
 250
 251         init = &cp->init;
 252         asoc = &stcb->asoc;
 253         /* save off parameters */
 254         asoc->peer_vtag = ntohl(init->initiate_tag);
 255         asoc->peers_rwnd = ntohl(init->a_rwnd);
 256         /* init tsn's */
 257         asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
 258
 259         if (!TAILQ_EMPTY(&asoc->nets)) {
 260                 /* update any ssthresh's that may have a default */
 261                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
 262                         lnet->ssthresh = asoc->peers_rwnd;
 263                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
 264                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
 265                         }
 266                 }
 267         }
 268         if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
 269                 unsigned int newcnt;
 270                 struct sctp_stream_out *outs;
 271                 struct sctp_stream_queue_pending *sp, *nsp;
 272                 struct sctp_tmit_chunk *chk, *nchk;
 273
 274                 /* abandon the upper streams */
 275                 newcnt = ntohs(init->num_inbound_streams);
 276                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
 277                         if (chk->rec.data.sid >= newcnt) {
 278                                 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
 279                                 asoc->send_queue_cnt--;
 280                                 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) {
 281                                         asoc->strmout[chk->rec.data.sid].chunks_on_queues--;
 282 #ifdef INVARIANTS
 283                                 } else {
 284                                         panic("No chunks on the queues for sid %u.", chk->rec.data.sid);
 285 #endif
 286                                 }
 287                                 if (chk->data != NULL) {
 288                                         sctp_free_bufspace(stcb, asoc, chk, 1);
 289                                         sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb,
 290                                             0, chk, SCTP_SO_NOT_LOCKED);
 291                                         if (chk->data) {
 292                                                 sctp_m_freem(chk->data);
 293                                                 chk->data = NULL;
 294                                         }
 295                                 }
 296                                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 297                                 /* sa_ignore FREED_MEMORY */
 298                         }
 299                 }
 300                 if (asoc->strmout) {
 301                         for (i = newcnt; i < asoc->pre_open_streams; i++) {
 302                                 outs = &asoc->strmout[i];
 303                                 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
 304                                         atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 305                                         TAILQ_REMOVE(&outs->outqueue, sp, next);
 306                                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp);
 307                                         sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
 308                                             stcb, 0, sp, SCTP_SO_NOT_LOCKED);
 309                                         if (sp->data) {
 310                                                 sctp_m_freem(sp->data);
 311                                                 sp->data = NULL;
 312                                         }
 313                                         if (sp->net) {
 314                                                 sctp_free_remote_addr(sp->net);
 315                                                 sp->net = NULL;
 316                                         }
 317                                         /* Free the chunk */
 318                                         sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
 319                                         /* sa_ignore FREED_MEMORY */
 320                                 }
 321                                 outs->state = SCTP_STREAM_CLOSED;
 322                         }
 323                 }
 324                 /* cut back the count */
 325                 asoc->pre_open_streams = newcnt;
 326         }
 327         asoc->streamoutcnt = asoc->pre_open_streams;
 328         if (asoc->strmout) {
 329                 for (i = 0; i < asoc->streamoutcnt; i++) {
 330                         asoc->strmout[i].state = SCTP_STREAM_OPEN;
 331                 }
 332         }
 333         /* EY - nr_sack: initialize highest tsn in nr_mapping_array */
 334         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
 335         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
 336                 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 337         }
 338         /* This is the next one we expect */
 339         asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
 340
 341         asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
 342         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
 343
 344         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
 345         /* open the requested streams */
 346
 347         if (asoc->strmin != NULL) {
 348                 /* Free the old ones */
 349                 for (i = 0; i < asoc->streamincnt; i++) {
 350                         sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue);
 351                         sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue);
 352                 }
 353                 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
 354         }
 355         if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) {
 356                 asoc->streamincnt = ntohs(init->num_outbound_streams);
 357         } else {
 358                 asoc->streamincnt = asoc->max_inbound_streams;
 359         }
 360         SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
 361             sizeof(struct sctp_stream_in), SCTP_M_STRMI);
 362         if (asoc->strmin == NULL) {
 363                 /* we didn't get memory for the streams! */
 364                 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
 365                 return (-1);
 366         }
 367         for (i = 0; i < asoc->streamincnt; i++) {
 368                 asoc->strmin[i].sid = i;
 369                 asoc->strmin[i].last_mid_delivered = 0xffffffff;
 370                 TAILQ_INIT(&asoc->strmin[i].inqueue);
 371                 TAILQ_INIT(&asoc->strmin[i].uno_inqueue);
 372                 asoc->strmin[i].pd_api_started = 0;
 373                 asoc->strmin[i].delivery_started = 0;
 374         }
 375         /*
 376          * load_address_from_init will put the addresses into the
 377          * association when the COOKIE is processed or the INIT-ACK is
 378          * processed. Both types of COOKIE's existing and new call this
 379          * routine. It will remove addresses that are no longer in the
 380          * association (for the restarting case where addresses are
 381          * removed). Up front when the INIT arrives we will discard it if it
 382          * is a restart and new addresses have been added.
 383          */
 384         /* sa_ignore MEMLEAK */
 385         return (0);
 386 }
 387
 388 /*
 389  * INIT-ACK message processing/consumption returns value < 0 on error
 390  */
 391 static int
 392 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
 393     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
 394     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
 395     struct sctp_nets *net, int *abort_no_unlock,
 396     uint8_t mflowtype, uint32_t mflowid,
 397     uint32_t vrf_id)
 398 {
 399         struct sctp_association *asoc;
 400         struct mbuf *op_err;
 401         int retval, abort_flag, cookie_found;
 402         int initack_limit;
 403         int nat_friendly = 0;
 404
 405         /* First verify that we have no illegal param's */
 406         abort_flag = 0;
 407         cookie_found = 0;
 408
 409         op_err = sctp_arethere_unrecognized_parameters(m,
 410             (offset + sizeof(struct sctp_init_chunk)),
 411             &abort_flag, (struct sctp_chunkhdr *)cp,
 412             &nat_friendly, &cookie_found);
 413         if (abort_flag) {
 414                 /* Send an abort and notify peer */
 415                 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, false, SCTP_SO_NOT_LOCKED);
 416                 *abort_no_unlock = 1;
 417                 return (-1);
 418         }
 419         if (!cookie_found) {
 420                 uint16_t len;
 421
 422                 /* Only report the missing cookie parameter */
 423                 if (op_err != NULL) {
 424                         sctp_m_freem(op_err);
 425                 }
 426                 len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t));
 427                 /* We abort with an error of missing mandatory param */
 428                 op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA);
 429                 if (op_err != NULL) {
 430                         struct sctp_error_missing_param *cause;
 431
 432                         SCTP_BUF_LEN(op_err) = len;
 433                         cause = mtod(op_err, struct sctp_error_missing_param *);
 434                         /* Subtract the reserved param */
 435                         cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM);
 436                         cause->cause.length = htons(len);
 437                         cause->num_missing_params = htonl(1);
 438                         cause->type[0] = htons(SCTP_STATE_COOKIE);
 439                 }
 440                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 441                     src, dst, sh, op_err,
 442                     mflowtype, mflowid,
 443                     vrf_id, net->port);
 444                 *abort_no_unlock = 1;
 445                 return (-3);
 446         }
 447         asoc = &stcb->asoc;
 448         asoc->peer_supports_nat = (uint8_t)nat_friendly;
 449         /* process the peer's parameters in the INIT-ACK */
 450         if (sctp_process_init((struct sctp_init_chunk *)cp, stcb) < 0) {
 451                 if (op_err != NULL) {
 452                         sctp_m_freem(op_err);
 453                 }
 454                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
 455                 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n");
 456                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 457                     src, dst, sh, op_err,
 458                     mflowtype, mflowid,
 459                     vrf_id, net->port);
 460                 *abort_no_unlock = 1;
 461                 return (-1);
 462         }
 463         initack_limit = offset + ntohs(cp->ch.chunk_length);
 464         /* load all addresses */
 465         if ((retval = sctp_load_addresses_from_init(stcb, m,
 466             offset + sizeof(struct sctp_init_chunk),
 467             initack_limit, src, dst, NULL, stcb->asoc.port)) < 0) {
 468                 if (op_err != NULL) {
 469                         sctp_m_freem(op_err);
 470                 }
 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
 493         stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
 494             stcb->asoc.local_hmacs);
 495         if (op_err) {
 496                 sctp_queue_op_err(stcb, op_err);
 497                 /* queuing will steal away the mbuf chain to the out queue */
 498                 op_err = NULL;
 499         }
 500         /* extract the cookie and queue it to "echo" it back... */
 501         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 502                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 503                     stcb->asoc.overall_error_count,
 504                     0,
 505                     SCTP_FROM_SCTP_INPUT,
 506                     __LINE__);
 507         }
 508         stcb->asoc.overall_error_count = 0;
 509         net->error_count = 0;
 510
 511         /*
 512          * Cancel the INIT timer, We do this first before queueing the
 513          * cookie. We always cancel at the primary to assume that we are
 514          * canceling the timer started by the INIT which always goes to the
 515          * primary.
 516          */
 517         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
 518             asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 519
 520         /* calculate the RTO */
 521         sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered,
 522             SCTP_RTT_FROM_NON_DATA);
 523         retval = sctp_send_cookie_echo(m, offset, initack_limit, stcb, net);
 524         return (retval);
 525 }
 526
 527 static void
 528 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
 529     struct sctp_tcb *stcb, struct sctp_nets *net)
 530 {
 531         union sctp_sockstore store;
 532         struct sctp_nets *r_net, *f_net;
 533         struct timeval tv;
 534         int req_prim = 0;
 535         uint16_t old_error_counter;
 536
 537         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
 538                 /* Invalid length */
 539                 return;
 540         }
 541
 542         memset(&store, 0, sizeof(store));
 543         switch (cp->heartbeat.hb_info.addr_family) {
 544 #ifdef INET
 545         case AF_INET:
 546                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
 547                         store.sin.sin_family = cp->heartbeat.hb_info.addr_family;
 548                         store.sin.sin_len = cp->heartbeat.hb_info.addr_len;
 549                         store.sin.sin_port = stcb->rport;
 550                         memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address,
 551                             sizeof(store.sin.sin_addr));
 552                 } else {
 553                         return;
 554                 }
 555                 break;
 556 #endif
 557 #ifdef INET6
 558         case AF_INET6:
 559                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
 560                         store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family;
 561                         store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len;
 562                         store.sin6.sin6_port = stcb->rport;
 563                         memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr));
 564                 } else {
 565                         return;
 566                 }
 567                 break;
 568 #endif
 569         default:
 570                 return;
 571         }
 572         r_net = sctp_findnet(stcb, &store.sa);
 573         if (r_net == NULL) {
 574                 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
 575                 return;
 576         }
 577         if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 578             (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
 579             (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
 580                 /*
 581                  * If the its a HB and it's random value is correct when can
 582                  * confirm the destination.
 583                  */
 584                 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 585                 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
 586                         stcb->asoc.primary_destination = r_net;
 587                         r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
 588                         f_net = TAILQ_FIRST(&stcb->asoc.nets);
 589                         if (f_net != r_net) {
 590                                 /*
 591                                  * first one on the list is NOT the primary
 592                                  * sctp_cmpaddr() is much more efficient if
 593                                  * the primary is the first on the list,
 594                                  * make it so.
 595                                  */
 596                                 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
 597                                 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
 598                         }
 599                         req_prim = 1;
 600                 }
 601                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 602                     stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 603                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb,
 604                     r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
 605                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 606         }
 607         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 608                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 609                     stcb->asoc.overall_error_count,
 610                     0,
 611                     SCTP_FROM_SCTP_INPUT,
 612                     __LINE__);
 613         }
 614         stcb->asoc.overall_error_count = 0;
 615         old_error_counter = r_net->error_count;
 616         r_net->error_count = 0;
 617         r_net->hb_responded = 1;
 618         tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
 619         tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
 620         /* Now lets do a RTO with this */
 621         sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv,
 622             SCTP_RTT_FROM_NON_DATA);
 623         if ((r_net->dest_state & SCTP_ADDR_REACHABLE) == 0) {
 624                 r_net->dest_state |= SCTP_ADDR_REACHABLE;
 625                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
 626                     0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 627         }
 628         if (r_net->dest_state & SCTP_ADDR_PF) {
 629                 r_net->dest_state &= ~SCTP_ADDR_PF;
 630                 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
 631         }
 632         if (old_error_counter > 0) {
 633                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
 634                     stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5);
 635                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 636         }
 637         if (r_net == stcb->asoc.primary_destination) {
 638                 if (stcb->asoc.alternate) {
 639                         /* release the alternate, primary is good */
 640                         sctp_free_remote_addr(stcb->asoc.alternate);
 641                         stcb->asoc.alternate = NULL;
 642                 }
 643         }
 644         /* Mobility adaptation */
 645         if (req_prim) {
 646                 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
 647                     SCTP_MOBILITY_BASE) ||
 648                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 649                     SCTP_MOBILITY_FASTHANDOFF)) &&
 650                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 651                     SCTP_MOBILITY_PRIM_DELETED)) {
 652                         sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED,
 653                             stcb->sctp_ep, stcb, NULL,
 654                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 655                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 656                             SCTP_MOBILITY_FASTHANDOFF)) {
 657                                 sctp_assoc_immediate_retrans(stcb,
 658                                     stcb->asoc.primary_destination);
 659                         }
 660                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 661                             SCTP_MOBILITY_BASE)) {
 662                                 sctp_move_chunks_from_net(stcb,
 663                                     stcb->asoc.deleted_primary);
 664                         }
 665                         sctp_delete_prim_timer(stcb->sctp_ep, stcb);
 666                 }
 667         }
 668 }
 669
 670 static int
 671 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
 672 {
 673         /*
 674          * Return 0 means we want you to proceed with the abort non-zero
 675          * means no abort processing.
 676          */
 677         uint32_t new_vtag;
 678         struct sctpasochead *head;
 679
 680         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
 681             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
 682                 atomic_add_int(&stcb->asoc.refcnt, 1);
 683                 SCTP_TCB_UNLOCK(stcb);
 684                 SCTP_INP_INFO_WLOCK();
 685                 SCTP_TCB_LOCK(stcb);
 686                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 687         } else {
 688                 return (0);
 689         }
 690         new_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 691         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) {
 692                 /* generate a new vtag and send init */
 693                 LIST_REMOVE(stcb, sctp_asocs);
 694                 stcb->asoc.my_vtag = new_vtag;
 695                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 696                 /*
 697                  * put it in the bucket in the vtag hash of assoc's for the
 698                  * system
 699                  */
 700                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 701                 SCTP_INP_INFO_WUNLOCK();
 702                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 703                 return (1);
 704         } else {
 705                 /*
 706                  * treat like a case where the cookie expired i.e.: - dump
 707                  * current cookie. - generate a new vtag. - resend init.
 708                  */
 709                 /* generate a new vtag and send init */
 710                 LIST_REMOVE(stcb, sctp_asocs);
 711                 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
 712                 sctp_stop_all_cookie_timers(stcb);
 713                 sctp_toss_old_cookies(stcb, &stcb->asoc);
 714                 stcb->asoc.my_vtag = new_vtag;
 715                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 716                 /*
 717                  * put it in the bucket in the vtag hash of assoc's for the
 718                  * system
 719                  */
 720                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 721                 SCTP_INP_INFO_WUNLOCK();
 722                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 723                 return (1);
 724         }
 725         return (0);
 726 }
 727
 728 static int
 729 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
 730     struct sctp_nets *net)
 731 {
 732         /*
 733          * return 0 means we want you to proceed with the abort non-zero
 734          * means no abort processing
 735          */
 736         if (stcb->asoc.auth_supported == 0) {
 737                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
 738                 return (0);
 739         }
 740         sctp_asconf_send_nat_state_update(stcb, net);
 741         return (1);
 742 }
 743
 744 /* Returns 1 if the stcb was aborted, 0 otherwise */
 745 static int
 746 sctp_handle_abort(struct sctp_abort_chunk *abort,
 747     struct sctp_tcb *stcb, struct sctp_nets *net)
 748 {
 749         uint16_t len;
 750         uint16_t error;
 751
 752         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
 753         if (stcb == NULL)
 754                 return (0);
 755
 756         len = ntohs(abort->ch.chunk_length);
 757         if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) {
 758                 /*
 759                  * Need to check the cause codes for our two magic nat
 760                  * aborts which don't kill the assoc necessarily.
 761                  */
 762                 struct sctp_error_cause *cause;
 763
 764                 cause = (struct sctp_error_cause *)(abort + 1);
 765                 error = ntohs(cause->code);
 766                 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) {
 767                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ABORT flags:%x\n",
 768                             abort->ch.chunk_flags);
 769                         if (sctp_handle_nat_colliding_state(stcb)) {
 770                                 return (0);
 771                         }
 772                 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) {
 773                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ABORT flags:%x\n",
 774                             abort->ch.chunk_flags);
 775                         if (sctp_handle_nat_missing_state(stcb, net)) {
 776                                 return (0);
 777                         }
 778                 }
 779         } else {
 780                 error = 0;
 781         }
 782         /* stop any receive timers */
 783         sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL,
 784             SCTP_FROM_SCTP_INPUT + SCTP_LOC_7);
 785         /* notify user of the abort and clean up... */
 786         sctp_abort_notification(stcb, true, false, error, abort, SCTP_SO_NOT_LOCKED);
 787         /* free the tcb */
 788         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
 789         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
 790             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 791                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 792         }
 793 #ifdef SCTP_ASOCLOG_OF_TSNS
 794         sctp_print_out_track_log(stcb);
 795 #endif
 796         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 797             SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
 798         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
 799         return (1);
 800 }
 801
 802 static void
 803 sctp_start_net_timers(struct sctp_tcb *stcb)
 804 {
 805         uint32_t cnt_hb_sent;
 806         struct sctp_nets *net;
 807
 808         cnt_hb_sent = 0;
 809         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 810                 /*
 811                  * For each network start: 1) A pmtu timer. 2) A HB timer 3)
 812                  * If the dest in unconfirmed send a hb as well if under
 813                  * max_hb_burst have been sent.
 814                  */
 815                 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
 816                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
 817                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
 818                     (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
 819                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 820                         cnt_hb_sent++;
 821                 }
 822         }
 823         if (cnt_hb_sent) {
 824                 sctp_chunk_output(stcb->sctp_ep, stcb,
 825                     SCTP_OUTPUT_FROM_COOKIE_ACK,
 826                     SCTP_SO_NOT_LOCKED);
 827         }
 828 }
 829
 830 static void
 831 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
 832     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
 833 {
 834         struct sctp_association *asoc;
 835         int some_on_streamwheel;
 836         int old_state;
 837
 838         SCTPDBG(SCTP_DEBUG_INPUT2,
 839             "sctp_handle_shutdown: handling SHUTDOWN\n");
 840         if (stcb == NULL)
 841                 return;
 842         asoc = &stcb->asoc;
 843         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
 844             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
 845                 return;
 846         }
 847         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
 848                 /* Shutdown NOT the expected size */
 849                 return;
 850         }
 851         old_state = SCTP_GET_STATE(stcb);
 852         sctp_update_acked(stcb, cp, abort_flag);
 853         if (*abort_flag) {
 854                 return;
 855         }
 856         if (asoc->control_pdapi) {
 857                 /*
 858                  * With a normal shutdown we assume the end of last record.
 859                  */
 860                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 861                 if (asoc->control_pdapi->on_strm_q) {
 862                         struct sctp_stream_in *strm;
 863
 864                         strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream];
 865                         if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) {
 866                                 /* Unordered */
 867                                 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm);
 868                                 asoc->control_pdapi->on_strm_q = 0;
 869                         } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) {
 870                                 /* Ordered */
 871                                 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm);
 872                                 asoc->control_pdapi->on_strm_q = 0;
 873 #ifdef INVARIANTS
 874                         } else {
 875                                 panic("Unknown state on ctrl:%p on_strm_q:%d",
 876                                     asoc->control_pdapi,
 877                                     asoc->control_pdapi->on_strm_q);
 878 #endif
 879                         }
 880                 }
 881                 asoc->control_pdapi->end_added = 1;
 882                 asoc->control_pdapi->pdapi_aborted = 1;
 883                 asoc->control_pdapi = NULL;
 884                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 885                 if (stcb->sctp_socket) {
 886                         sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 887                 }
 888         }
 889         /* goto SHUTDOWN_RECEIVED state to block new requests */
 890         if (stcb->sctp_socket) {
 891                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 892                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
 893                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) {
 894                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_RECEIVED);
 895                         /*
 896                          * notify upper layer that peer has initiated a
 897                          * shutdown
 898                          */
 899                         sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 900
 901                         /* reset time */
 902                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
 903                 }
 904         }
 905         if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) {
 906                 /*
 907                  * stop the shutdown timer, since we WILL move to
 908                  * SHUTDOWN-ACK-SENT.
 909                  */
 910                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
 911                     net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
 912         }
 913         /* Now is there unsent data on a stream somewhere? */
 914         some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
 915
 916         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 917             !TAILQ_EMPTY(&asoc->sent_queue) ||
 918             some_on_streamwheel) {
 919                 /* By returning we will push more data out */
 920                 return;
 921         } else {
 922                 /* no outstanding data to send, so move on... */
 923                 /* send SHUTDOWN-ACK */
 924                 /* move to SHUTDOWN-ACK-SENT state */
 925                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
 926                     (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 927                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 928                 }
 929                 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
 930                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_ACK_SENT);
 931                         sctp_stop_timers_for_shutdown(stcb);
 932                         sctp_send_shutdown_ack(stcb, net);
 933                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
 934                             stcb->sctp_ep, stcb, net);
 935                 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) {
 936                         sctp_send_shutdown_ack(stcb, net);
 937                 }
 938         }
 939 }
 940
 941 static void
 942 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
 943     struct sctp_tcb *stcb,
 944     struct sctp_nets *net)
 945 {
 946         struct sctp_association *asoc;
 947
 948         SCTPDBG(SCTP_DEBUG_INPUT2,
 949             "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
 950         if (stcb == NULL)
 951                 return;
 952
 953         asoc = &stcb->asoc;
 954         /* process according to association state */
 955         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
 956             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
 957                 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
 958                 sctp_send_shutdown_complete(stcb, net, 1);
 959                 SCTP_TCB_UNLOCK(stcb);
 960                 return;
 961         }
 962         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
 963             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 964                 /* unexpected SHUTDOWN-ACK... so ignore... */
 965                 SCTP_TCB_UNLOCK(stcb);
 966                 return;
 967         }
 968         if (asoc->control_pdapi) {
 969                 /*
 970                  * With a normal shutdown we assume the end of last record.
 971                  */
 972                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 973                 asoc->control_pdapi->end_added = 1;
 974                 asoc->control_pdapi->pdapi_aborted = 1;
 975                 asoc->control_pdapi = NULL;
 976                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 977                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 978         }
 979 #ifdef INVARIANTS
 980         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 981             !TAILQ_EMPTY(&asoc->sent_queue) ||
 982             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
 983                 panic("Queues are not empty when handling SHUTDOWN-ACK");
 984         }
 985 #endif
 986         /* stop the timer */
 987         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net,
 988             SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
 989         /* send SHUTDOWN-COMPLETE */
 990         sctp_send_shutdown_complete(stcb, net, 0);
 991         /* notify upper layer protocol */
 992         if (stcb->sctp_socket) {
 993                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
 994                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
 995                         SCTP_SB_CLEAR(stcb->sctp_socket->so_snd);
 996                 }
 997                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 998         }
 999         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1000         /* free the TCB but first save off the ep */
1001         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1002             SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1003 }
1004
1005 static void
1006 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type)
1007 {
1008         switch (chunk_type) {
1009         case SCTP_ASCONF_ACK:
1010         case SCTP_ASCONF:
1011                 sctp_asconf_cleanup(stcb);
1012                 break;
1013         case SCTP_IFORWARD_CUM_TSN:
1014         case SCTP_FORWARD_CUM_TSN:
1015                 stcb->asoc.prsctp_supported = 0;
1016                 break;
1017         default:
1018                 SCTPDBG(SCTP_DEBUG_INPUT2,
1019                     "Peer does not support chunk type %d (0x%x).\n",
1020                     chunk_type, chunk_type);
1021                 break;
1022         }
1023 }
1024
1025 /*
1026  * Skip past the param header and then we will find the param that caused the
1027  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1028  * these will turn of specific features.
1029  * XXX: Is this the right thing to do?
1030  */
1031 static void
1032 sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type)
1033 {
1034         switch (parameter_type) {
1035                 /* pr-sctp draft */
1036         case SCTP_PRSCTP_SUPPORTED:
1037                 stcb->asoc.prsctp_supported = 0;
1038                 break;
1039         case SCTP_SUPPORTED_CHUNK_EXT:
1040                 break;
1041                 /* draft-ietf-tsvwg-addip-sctp */
1042         case SCTP_HAS_NAT_SUPPORT:
1043                 stcb->asoc.peer_supports_nat = 0;
1044                 break;
1045         case SCTP_ADD_IP_ADDRESS:
1046         case SCTP_DEL_IP_ADDRESS:
1047         case SCTP_SET_PRIM_ADDR:
1048                 stcb->asoc.asconf_supported = 0;
1049                 break;
1050         case SCTP_SUCCESS_REPORT:
1051         case SCTP_ERROR_CAUSE_IND:
1052                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1053                 SCTPDBG(SCTP_DEBUG_INPUT2,
1054                     "Turning off ASCONF to this strange peer\n");
1055                 stcb->asoc.asconf_supported = 0;
1056                 break;
1057         default:
1058                 SCTPDBG(SCTP_DEBUG_INPUT2,
1059                     "Peer does not support param type %d (0x%x)??\n",
1060                     parameter_type, parameter_type);
1061                 break;
1062         }
1063 }
1064
1065 static int
1066 sctp_handle_error(struct sctp_chunkhdr *ch,
1067     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
1068 {
1069         struct sctp_error_cause *cause;
1070         struct sctp_association *asoc;
1071         uint32_t remaining_length, adjust;
1072         uint16_t code, cause_code, cause_length;
1073
1074         /* parse through all of the errors and process */
1075         asoc = &stcb->asoc;
1076         cause = (struct sctp_error_cause *)((caddr_t)ch +
1077             sizeof(struct sctp_chunkhdr));
1078         remaining_length = ntohs(ch->chunk_length);
1079         if (remaining_length > limit) {
1080                 remaining_length = limit;
1081         }
1082         if (remaining_length >= sizeof(struct sctp_chunkhdr)) {
1083                 remaining_length -= sizeof(struct sctp_chunkhdr);
1084         } else {
1085                 remaining_length = 0;
1086         }
1087         code = 0;
1088         while (remaining_length >= sizeof(struct sctp_error_cause)) {
1089                 /* Process an Error Cause */
1090                 cause_code = ntohs(cause->code);
1091                 cause_length = ntohs(cause->length);
1092                 if ((cause_length > remaining_length) || (cause_length == 0)) {
1093                         /* Invalid cause length, possibly due to truncation. */
1094                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n",
1095                             remaining_length, cause_length);
1096                         return (0);
1097                 }
1098                 if (code == 0) {
1099                         /* report the first error cause */
1100                         code = cause_code;
1101                 }
1102                 switch (cause_code) {
1103                 case SCTP_CAUSE_INVALID_STREAM:
1104                 case SCTP_CAUSE_MISSING_PARAM:
1105                 case SCTP_CAUSE_INVALID_PARAM:
1106                 case SCTP_CAUSE_NO_USER_DATA:
1107                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n",
1108                             cause_code);
1109                         break;
1110                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1111                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ERROR flags: %x\n",
1112                             ch->chunk_flags);
1113                         if (sctp_handle_nat_colliding_state(stcb)) {
1114                                 return (0);
1115                         }
1116                         break;
1117                 case SCTP_CAUSE_NAT_MISSING_STATE:
1118                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ERROR flags: %x\n",
1119                             ch->chunk_flags);
1120                         if (sctp_handle_nat_missing_state(stcb, net)) {
1121                                 return (0);
1122                         }
1123                         break;
1124                 case SCTP_CAUSE_STALE_COOKIE:
1125                         /*
1126                          * We only act if we have echoed a cookie and are
1127                          * waiting.
1128                          */
1129                         if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) &&
1130                             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
1131                                 struct sctp_error_stale_cookie *stale_cookie;
1132
1133                                 stale_cookie = (struct sctp_error_stale_cookie *)cause;
1134                                 /* stable_time is in usec, convert to msec. */
1135                                 asoc->cookie_preserve_req = ntohl(stale_cookie->stale_time) / 1000;
1136                                 /* Double it to be more robust on RTX. */
1137                                 asoc->cookie_preserve_req *= 2;
1138                                 asoc->stale_cookie_count++;
1139                                 if (asoc->stale_cookie_count >
1140                                     asoc->max_init_times) {
1141                                         sctp_abort_notification(stcb, false, true, 0, NULL, SCTP_SO_NOT_LOCKED);
1142                                         /* now free the asoc */
1143                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1144                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1145                                         return (-1);
1146                                 }
1147                                 /* blast back to INIT state */
1148                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
1149                                 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
1150                                 sctp_stop_all_cookie_timers(stcb);
1151                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1152                         }
1153                         break;
1154                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1155                         /*
1156                          * Nothing we can do here, we don't do hostname
1157                          * addresses so if the peer does not like my IPv6
1158                          * (or IPv4 for that matter) it does not matter. If
1159                          * they don't support that type of address, they can
1160                          * NOT possibly get that packet type... i.e. with no
1161                          * IPv6 you can't receive a IPv6 packet. so we can
1162                          * safely ignore this one. If we ever added support
1163                          * for HOSTNAME Addresses, then we would need to do
1164                          * something here.
1165                          */
1166                         break;
1167                 case SCTP_CAUSE_UNRECOG_CHUNK:
1168                         if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) {
1169                                 struct sctp_error_unrecognized_chunk *unrec_chunk;
1170
1171                                 unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause;
1172                                 sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type);
1173                         }
1174                         break;
1175                 case SCTP_CAUSE_UNRECOG_PARAM:
1176                         /* XXX: We only consider the first parameter */
1177                         if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) {
1178                                 struct sctp_paramhdr *unrec_parameter;
1179
1180                                 unrec_parameter = (struct sctp_paramhdr *)(cause + 1);
1181                                 sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type));
1182                         }
1183                         break;
1184                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1185                         /*
1186                          * We ignore this since the timer will drive out a
1187                          * new cookie anyway and there timer will drive us
1188                          * to send a SHUTDOWN_COMPLETE. We can't send one
1189                          * here since we don't have their tag.
1190                          */
1191                         break;
1192                 case SCTP_CAUSE_DELETING_LAST_ADDR:
1193                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1194                 case SCTP_CAUSE_DELETING_SRC_ADDR:
1195                         /*
1196                          * We should NOT get these here, but in a
1197                          * ASCONF-ACK.
1198                          */
1199                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n",
1200                             cause_code);
1201                         break;
1202                 case SCTP_CAUSE_OUT_OF_RESC:
1203                         /*
1204                          * And what, pray tell do we do with the fact that
1205                          * the peer is out of resources? Not really sure we
1206                          * could do anything but abort. I suspect this
1207                          * should have came WITH an abort instead of in a
1208                          * OP-ERROR.
1209                          */
1210                         break;
1211                 default:
1212                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n",
1213                             cause_code);
1214                         break;
1215                 }
1216                 adjust = SCTP_SIZE32(cause_length);
1217                 if (remaining_length >= adjust) {
1218                         remaining_length -= adjust;
1219                 } else {
1220                         remaining_length = 0;
1221                 }
1222                 cause = (struct sctp_error_cause *)((caddr_t)cause + adjust);
1223         }
1224         sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED);
1225         return (0);
1226 }
1227
1228 static int
1229 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1230     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
1231     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1232     struct sctp_nets *net, int *abort_no_unlock,
1233     uint8_t mflowtype, uint32_t mflowid,
1234     uint32_t vrf_id)
1235 {
1236         struct sctp_init_ack *init_ack;
1237         struct mbuf *op_err;
1238
1239         SCTPDBG(SCTP_DEBUG_INPUT2,
1240             "sctp_handle_init_ack: handling INIT-ACK\n");
1241
1242         if (stcb == NULL) {
1243                 SCTPDBG(SCTP_DEBUG_INPUT2,
1244                     "sctp_handle_init_ack: TCB is null\n");
1245                 return (-1);
1246         }
1247         /* Only process the INIT-ACK chunk in COOKIE WAIT state. */
1248         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) {
1249                 init_ack = &cp->init;
1250                 /* Validate parameters. */
1251                 if ((ntohl(init_ack->initiate_tag) == 0) ||
1252                     (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) ||
1253                     (ntohs(init_ack->num_inbound_streams) == 0) ||
1254                     (ntohs(init_ack->num_outbound_streams) == 0)) {
1255                         /* One of the mandatory parameters is illegal. */
1256                         op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1257                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1258                             src, dst, sh, op_err,
1259                             mflowtype, mflowid,
1260                             vrf_id, net->port);
1261                         *abort_no_unlock = 1;
1262                         return (-1);
1263                 }
1264                 if (stcb->asoc.primary_destination->dest_state &
1265                     SCTP_ADDR_UNCONFIRMED) {
1266                         /*
1267                          * The primary is where we sent the INIT, we can
1268                          * always consider it confirmed when the INIT-ACK is
1269                          * returned. Do this before we load addresses
1270                          * though.
1271                          */
1272                         stcb->asoc.primary_destination->dest_state &=
1273                             ~SCTP_ADDR_UNCONFIRMED;
1274                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1275                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1276                 }
1277                 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
1278                     net, abort_no_unlock,
1279                     mflowtype, mflowid,
1280                     vrf_id) < 0) {
1281                         /* error in parsing parameters */
1282                         return (-1);
1283                 }
1284                 /* Update our state. */
1285                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1286                 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_ECHOED);
1287
1288                 /* Reset the RTO calculation. */
1289                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1290                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1291                             stcb->asoc.overall_error_count,
1292                             0,
1293                             SCTP_FROM_SCTP_INPUT,
1294                             __LINE__);
1295                 }
1296                 stcb->asoc.overall_error_count = 0;
1297                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1298                 /*
1299                  * Collapse the init timer back in case of a exponential
1300                  * backoff.
1301                  */
1302                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1303                     stcb, net);
1304                 /*
1305                  * The output routine at the end of the inbound data
1306                  * processing will cause the cookie to be sent.
1307                  */
1308                 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1309                 return (0);
1310         } else {
1311                 return (-1);
1312         }
1313 }
1314
1315 static struct sctp_tcb *
1316 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1317     struct sockaddr *src, struct sockaddr *dst,
1318     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1319     struct sctp_inpcb *inp, struct sctp_nets **netp,
1320     struct sockaddr *init_src, int *notification,
1321     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1322     uint8_t mflowtype, uint32_t mflowid,
1323     uint32_t vrf_id, uint16_t port);
1324
1325 /*
1326  * handle a state cookie for an existing association m: input packet mbuf
1327  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1328  * "split" mbuf and the cookie signature does not exist offset: offset into
1329  * mbuf to the cookie-echo chunk
1330  */
1331 static struct sctp_tcb *
1332 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1333     struct sockaddr *src, struct sockaddr *dst,
1334     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1335     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1336     struct sockaddr *init_src, int *notification,
1337     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1338     uint8_t mflowtype, uint32_t mflowid,
1339     uint32_t vrf_id, uint16_t port)
1340 {
1341         struct sctp_association *asoc;
1342         struct sctp_init_chunk *init_cp, init_buf;
1343         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1344         struct sctp_asconf_addr *aparam, *naparam;
1345         struct sctp_asconf_ack *aack, *naack;
1346         struct sctp_tmit_chunk *chk, *nchk;
1347         struct sctp_stream_reset_list *strrst, *nstrrst;
1348         struct sctp_queued_to_read *sq, *nsq;
1349         struct sctp_nets *net;
1350         struct mbuf *op_err;
1351         struct timeval old;
1352         int init_offset, initack_offset, i;
1353         int retval;
1354         int spec_flag = 0;
1355         uint32_t how_indx;
1356 #if defined(SCTP_DETAILED_STR_STATS)
1357         int j;
1358 #endif
1359
1360         net = *netp;
1361         /* I know that the TCB is non-NULL from the caller */
1362         asoc = &stcb->asoc;
1363         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1364                 if (asoc->cookie_how[how_indx] == 0)
1365                         break;
1366         }
1367         if (how_indx < sizeof(asoc->cookie_how)) {
1368                 asoc->cookie_how[how_indx] = 1;
1369         }
1370         if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1371                 /* SHUTDOWN came in after sending INIT-ACK */
1372                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1373                 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, "");
1374                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
1375                     mflowtype, mflowid, inp->fibnum,
1376                     vrf_id, net->port);
1377                 if (how_indx < sizeof(asoc->cookie_how))
1378                         asoc->cookie_how[how_indx] = 2;
1379                 SCTP_TCB_UNLOCK(stcb);
1380                 return (NULL);
1381         }
1382         /*
1383          * find and validate the INIT chunk in the cookie (peer's info) the
1384          * INIT should start after the cookie-echo header struct (chunk
1385          * header, state cookie header struct)
1386          */
1387         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1388
1389         init_cp = (struct sctp_init_chunk *)
1390             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1391             (uint8_t *)&init_buf);
1392         if (init_cp == NULL) {
1393                 /* could not pull a INIT chunk in cookie */
1394                 SCTP_TCB_UNLOCK(stcb);
1395                 return (NULL);
1396         }
1397         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1398                 SCTP_TCB_UNLOCK(stcb);
1399                 return (NULL);
1400         }
1401         /*
1402          * find and validate the INIT-ACK chunk in the cookie (my info) the
1403          * INIT-ACK follows the INIT chunk
1404          */
1405         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1406         initack_cp = (struct sctp_init_ack_chunk *)
1407             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1408             (uint8_t *)&initack_buf);
1409         if (initack_cp == NULL) {
1410                 /* could not pull INIT-ACK chunk in cookie */
1411                 SCTP_TCB_UNLOCK(stcb);
1412                 return (NULL);
1413         }
1414         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1415                 SCTP_TCB_UNLOCK(stcb);
1416                 return (NULL);
1417         }
1418         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1419             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1420                 /*
1421                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
1422                  * to get into the OPEN state
1423                  */
1424                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1425                         /*-
1426                          * Opps, this means that we somehow generated two vtag's
1427                          * the same. I.e. we did:
1428                          *  Us               Peer
1429                          *   <---INIT(tag=a)------
1430                          *   ----INIT-ACK(tag=t)-->
1431                          *   ----INIT(tag=t)------> *1
1432                          *   <---INIT-ACK(tag=a)---
1433                          *   <----CE(tag=t)------------- *2
1434                          *
1435                          * At point *1 we should be generating a different
1436                          * tag t'. Which means we would throw away the CE and send
1437                          * ours instead. Basically this is case C (throw away side).
1438                          */
1439                         if (how_indx < sizeof(asoc->cookie_how))
1440                                 asoc->cookie_how[how_indx] = 17;
1441                         SCTP_TCB_UNLOCK(stcb);
1442                         return (NULL);
1443                 }
1444                 switch (SCTP_GET_STATE(stcb)) {
1445                 case SCTP_STATE_COOKIE_WAIT:
1446                 case SCTP_STATE_COOKIE_ECHOED:
1447                         /*
1448                          * INIT was sent but got a COOKIE_ECHO with the
1449                          * correct tags... just accept it...but we must
1450                          * process the init so that we can make sure we have
1451                          * the right seq no's.
1452                          */
1453                         /* First we must process the INIT !! */
1454                         if (sctp_process_init(init_cp, stcb) < 0) {
1455                                 if (how_indx < sizeof(asoc->cookie_how))
1456                                         asoc->cookie_how[how_indx] = 3;
1457                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
1458                                 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n");
1459                                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1460                                     src, dst, sh, op_err,
1461                                     mflowtype, mflowid,
1462                                     vrf_id, net->port);
1463                                 return (NULL);
1464                         }
1465                         /* we have already processed the INIT so no problem */
1466                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp,
1467                             stcb, net,
1468                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1469                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp,
1470                             stcb, net,
1471                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1472                         /* update current state */
1473                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)
1474                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1475                         else
1476                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1477
1478                         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1479                         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1480                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1481                                     stcb->sctp_ep, stcb, NULL);
1482                         }
1483                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1484                         sctp_stop_all_cookie_timers(stcb);
1485                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1486                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1487                             (!SCTP_IS_LISTENING(inp))) {
1488                                 /*
1489                                  * Here is where collision would go if we
1490                                  * did a connect() and instead got a
1491                                  * init/init-ack/cookie done before the
1492                                  * init-ack came back..
1493                                  */
1494                                 sctp_pcb_add_flags(stcb->sctp_ep, SCTP_PCB_FLAGS_CONNECTED);
1495                                 soisconnected(stcb->sctp_socket);
1496                         }
1497                         /* notify upper layer */
1498                         *notification = SCTP_NOTIFY_ASSOC_UP;
1499                         /*
1500                          * since we did not send a HB make sure we don't
1501                          * double things
1502                          */
1503                         old.tv_sec = cookie->time_entered.tv_sec;
1504                         old.tv_usec = cookie->time_entered.tv_usec;
1505                         net->hb_responded = 1;
1506                         sctp_calculate_rto(stcb, asoc, net, &old,
1507                             SCTP_RTT_FROM_NON_DATA);
1508
1509                         if (stcb->asoc.sctp_autoclose_ticks &&
1510                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1511                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1512                                     inp, stcb, NULL);
1513                         }
1514                         break;
1515                 default:
1516                         /*
1517                          * we're in the OPEN state (or beyond), so peer must
1518                          * have simply lost the COOKIE-ACK
1519                          */
1520                         break;
1521                 }               /* end switch */
1522                 sctp_stop_all_cookie_timers(stcb);
1523                 if ((retval = sctp_load_addresses_from_init(stcb, m,
1524                     init_offset + sizeof(struct sctp_init_chunk),
1525                     initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) {
1526                         if (how_indx < sizeof(asoc->cookie_how))
1527                                 asoc->cookie_how[how_indx] = 4;
1528                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
1529                             "Problem with address parameters");
1530                         SCTPDBG(SCTP_DEBUG_INPUT1,
1531                             "Load addresses from INIT causes an abort %d\n",
1532                             retval);
1533                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1534                             src, dst, sh, op_err,
1535                             mflowtype, mflowid,
1536                             vrf_id, net->port);
1537                         return (NULL);
1538                 }
1539                 /* respond with a COOKIE-ACK */
1540                 sctp_toss_old_cookies(stcb, asoc);
1541                 sctp_send_cookie_ack(stcb);
1542                 if (how_indx < sizeof(asoc->cookie_how))
1543                         asoc->cookie_how[how_indx] = 5;
1544                 return (stcb);
1545         }
1546
1547         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1548             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1549             cookie->tie_tag_my_vtag == 0 &&
1550             cookie->tie_tag_peer_vtag == 0) {
1551                 /*
1552                  * case C in Section 5.2.4 Table 2: XMOO silently discard
1553                  */
1554                 if (how_indx < sizeof(asoc->cookie_how))
1555                         asoc->cookie_how[how_indx] = 6;
1556                 SCTP_TCB_UNLOCK(stcb);
1557                 return (NULL);
1558         }
1559         /*
1560          * If nat support, and the below and stcb is established, send back
1561          * a ABORT(colliding state) if we are established.
1562          */
1563         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) &&
1564             (asoc->peer_supports_nat) &&
1565             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1566             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1567             (asoc->peer_vtag == 0)))) {
1568                 /*
1569                  * Special case - Peer's support nat. We may have two init's
1570                  * that we gave out the same tag on since one was not
1571                  * established.. i.e. we get INIT from host-1 behind the nat
1572                  * and we respond tag-a, we get a INIT from host-2 behind
1573                  * the nat and we get tag-a again. Then we bring up host-1
1574                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1575                  * Now we have colliding state. We must send an abort here
1576                  * with colliding state indication.
1577                  */
1578                 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, "");
1579                 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
1580                     mflowtype, mflowid, inp->fibnum,
1581                     vrf_id, port);
1582                 SCTP_TCB_UNLOCK(stcb);
1583                 return (NULL);
1584         }
1585         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1586             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1587             (asoc->peer_vtag == 0))) {
1588                 /*
1589                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1590                  * should be ok, re-accept peer info
1591                  */
1592                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1593                         /*
1594                          * Extension of case C. If we hit this, then the
1595                          * random number generator returned the same vtag
1596                          * when we first sent our INIT-ACK and when we later
1597                          * sent our INIT. The side with the seq numbers that
1598                          * are different will be the one that normally would
1599                          * have hit case C. This in effect "extends" our
1600                          * vtags in this collision case to be 64 bits. The
1601                          * same collision could occur aka you get both vtag
1602                          * and seq number the same twice in a row.. but is
1603                          * much less likely. If it did happen then we would
1604                          * proceed through and bring up the assoc.. we may
1605                          * end up with the wrong stream setup however..
1606                          * which would be bad.. but there is no way to
1607                          * tell.. until we send on a stream that does not
1608                          * exist :-)
1609                          */
1610                         if (how_indx < sizeof(asoc->cookie_how))
1611                                 asoc->cookie_how[how_indx] = 7;
1612
1613                         SCTP_TCB_UNLOCK(stcb);
1614                         return (NULL);
1615                 }
1616                 if (how_indx < sizeof(asoc->cookie_how))
1617                         asoc->cookie_how[how_indx] = 8;
1618                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1619                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1620                 sctp_stop_all_cookie_timers(stcb);
1621                 /*
1622                  * since we did not send a HB make sure we don't double
1623                  * things
1624                  */
1625                 net->hb_responded = 1;
1626                 if (stcb->asoc.sctp_autoclose_ticks &&
1627                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1628                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1629                             NULL);
1630                 }
1631                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1632                 if (asoc->pre_open_streams < asoc->streamoutcnt) {
1633                         asoc->pre_open_streams = asoc->streamoutcnt;
1634                 }
1635
1636                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1637                         /*
1638                          * Ok the peer probably discarded our data (if we
1639                          * echoed a cookie+data). So anything on the
1640                          * sent_queue should be marked for retransmit, we
1641                          * may not get something to kick us so it COULD
1642                          * still take a timeout to move these.. but it can't
1643                          * hurt to mark them.
1644                          */
1645
1646                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1647                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1648                                         chk->sent = SCTP_DATAGRAM_RESEND;
1649                                         sctp_flight_size_decrease(chk);
1650                                         sctp_total_flight_decrease(stcb, chk);
1651                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1652                                         spec_flag++;
1653                                 }
1654                         }
1655                 }
1656                 /* process the INIT info (peer's info) */
1657                 if (sctp_process_init(init_cp, stcb) < 0) {
1658                         if (how_indx < sizeof(asoc->cookie_how))
1659                                 asoc->cookie_how[how_indx] = 9;
1660                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
1661                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n");
1662                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1663                             src, dst, sh, op_err,
1664                             mflowtype, mflowid,
1665                             vrf_id, net->port);
1666                         return (NULL);
1667                 }
1668                 if ((retval = sctp_load_addresses_from_init(stcb, m,
1669                     init_offset + sizeof(struct sctp_init_chunk),
1670                     initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) {
1671                         if (how_indx < sizeof(asoc->cookie_how))
1672                                 asoc->cookie_how[how_indx] = 10;
1673                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
1674                             "Problem with address parameters");
1675                         SCTPDBG(SCTP_DEBUG_INPUT1,
1676                             "Load addresses from INIT causes an abort %d\n",
1677                             retval);
1678                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1679                             src, dst, sh, op_err,
1680                             mflowtype, mflowid,
1681                             vrf_id, net->port);
1682                         return (NULL);
1683                 }
1684                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
1685                     (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
1686                         *notification = SCTP_NOTIFY_ASSOC_UP;
1687
1688                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1689                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1690                             (!SCTP_IS_LISTENING(inp))) {
1691                                 sctp_pcb_add_flags(stcb->sctp_ep, SCTP_PCB_FLAGS_CONNECTED);
1692                                 soisconnected(stcb->sctp_socket);
1693                         }
1694                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)
1695                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1696                         else
1697                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1698                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1699                 } else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
1700                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1701                 } else {
1702                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1703                 }
1704                 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1705                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1706                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1707                             stcb->sctp_ep, stcb, NULL);
1708                 }
1709                 sctp_stop_all_cookie_timers(stcb);
1710                 sctp_toss_old_cookies(stcb, asoc);
1711                 sctp_send_cookie_ack(stcb);
1712                 if (spec_flag) {
1713                         /*
1714                          * only if we have retrans set do we do this. What
1715                          * this call does is get only the COOKIE-ACK out and
1716                          * then when we return the normal call to
1717                          * sctp_chunk_output will get the retrans out behind
1718                          * this.
1719                          */
1720                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1721                 }
1722                 if (how_indx < sizeof(asoc->cookie_how))
1723                         asoc->cookie_how[how_indx] = 11;
1724
1725                 return (stcb);
1726         }
1727         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1728             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1729             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1730             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1731             cookie->tie_tag_peer_vtag != 0) {
1732                 struct sctpasochead *head;
1733
1734                 if (asoc->peer_supports_nat) {
1735                         struct sctp_tcb *local_stcb;
1736
1737                         /*
1738                          * This is a gross gross hack. Just call the
1739                          * cookie_new code since we are allowing a duplicate
1740                          * association. I hope this works...
1741                          */
1742                         local_stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst,
1743                             sh, cookie, cookie_len,
1744                             inp, netp, init_src, notification,
1745                             auth_skipped, auth_offset, auth_len,
1746                             mflowtype, mflowid,
1747                             vrf_id, port);
1748                         if (local_stcb == NULL) {
1749                                 SCTP_TCB_UNLOCK(stcb);
1750                         }
1751                         return (local_stcb);
1752                 }
1753                 /*
1754                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1755                  */
1756                 /* temp code */
1757                 if (how_indx < sizeof(asoc->cookie_how))
1758                         asoc->cookie_how[how_indx] = 12;
1759                 sctp_stop_association_timers(stcb, false);
1760                 /* notify upper layer */
1761                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1762                 atomic_add_int(&stcb->asoc.refcnt, 1);
1763                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) &&
1764                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1765                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) {
1766                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1767                 }
1768                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
1769                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1770                 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
1771                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1772                 }
1773                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1774                         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1775                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1776                             stcb->sctp_ep, stcb, NULL);
1777
1778                 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
1779                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1780                         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1781                 }
1782                 if (asoc->pre_open_streams < asoc->streamoutcnt) {
1783                         asoc->pre_open_streams = asoc->streamoutcnt;
1784                 }
1785                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1786                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1787                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1788                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1789                 asoc->str_reset_seq_in = asoc->init_seq_number;
1790                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1791                 asoc->send_sack = 1;
1792                 asoc->data_pkts_seen = 0;
1793                 asoc->last_data_chunk_from = NULL;
1794                 asoc->last_control_chunk_from = NULL;
1795                 asoc->last_net_cmt_send_started = NULL;
1796                 if (asoc->mapping_array) {
1797                         memset(asoc->mapping_array, 0,
1798                             asoc->mapping_array_size);
1799                 }
1800                 if (asoc->nr_mapping_array) {
1801                         memset(asoc->nr_mapping_array, 0,
1802                             asoc->mapping_array_size);
1803                 }
1804                 SCTP_TCB_UNLOCK(stcb);
1805                 SCTP_INP_INFO_WLOCK();
1806                 SCTP_INP_WLOCK(stcb->sctp_ep);
1807                 SCTP_TCB_LOCK(stcb);
1808                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1809                 /* send up all the data */
1810                 sctp_report_all_outbound(stcb, 0, SCTP_SO_LOCKED);
1811                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1812                         stcb->asoc.strmout[i].chunks_on_queues = 0;
1813 #if defined(SCTP_DETAILED_STR_STATS)
1814                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
1815                                 asoc->strmout[i].abandoned_sent[j] = 0;
1816                                 asoc->strmout[i].abandoned_unsent[j] = 0;
1817                         }
1818 #else
1819                         asoc->strmout[i].abandoned_sent[0] = 0;
1820                         asoc->strmout[i].abandoned_unsent[0] = 0;
1821 #endif
1822                         stcb->asoc.strmout[i].next_mid_ordered = 0;
1823                         stcb->asoc.strmout[i].next_mid_unordered = 0;
1824                         stcb->asoc.strmout[i].sid = i;
1825                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
1826                 }
1827                 TAILQ_FOREACH_SAFE(strrst, &asoc->resetHead, next_resp, nstrrst) {
1828                         TAILQ_REMOVE(&asoc->resetHead, strrst, next_resp);
1829                         SCTP_FREE(strrst, SCTP_M_STRESET);
1830                 }
1831                 TAILQ_FOREACH_SAFE(sq, &asoc->pending_reply_queue, next, nsq) {
1832                         TAILQ_REMOVE(&asoc->pending_reply_queue, sq, next);
1833                         if (sq->data) {
1834                                 sctp_m_freem(sq->data);
1835                                 sq->data = NULL;
1836                         }
1837                         sctp_free_remote_addr(sq->whoFrom);
1838                         sq->whoFrom = NULL;
1839                         sq->stcb = NULL;
1840                         sctp_free_a_readq(stcb, sq);
1841                 }
1842                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
1843                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
1844                         if (chk->data) {
1845                                 sctp_m_freem(chk->data);
1846                                 chk->data = NULL;
1847                         }
1848                         if (chk->holds_key_ref)
1849                                 sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED);
1850                         sctp_free_remote_addr(chk->whoTo);
1851                         SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk);
1852                         SCTP_DECR_CHK_COUNT();
1853                 }
1854                 asoc->ctrl_queue_cnt = 0;
1855                 asoc->str_reset = NULL;
1856                 asoc->stream_reset_outstanding = 0;
1857                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
1858                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
1859                         if (chk->data) {
1860                                 sctp_m_freem(chk->data);
1861                                 chk->data = NULL;
1862                         }
1863                         if (chk->holds_key_ref)
1864                                 sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED);
1865                         sctp_free_remote_addr(chk->whoTo);
1866                         SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk);
1867                         SCTP_DECR_CHK_COUNT();
1868                 }
1869                 TAILQ_FOREACH_SAFE(aparam, &asoc->asconf_queue, next, naparam) {
1870                         TAILQ_REMOVE(&asoc->asconf_queue, aparam, next);
1871                         SCTP_FREE(aparam, SCTP_M_ASC_ADDR);
1872                 }
1873                 TAILQ_FOREACH_SAFE(aack, &asoc->asconf_ack_sent, next, naack) {
1874                         TAILQ_REMOVE(&asoc->asconf_ack_sent, aack, next);
1875                         if (aack->data != NULL) {
1876                                 sctp_m_freem(aack->data);
1877                         }
1878                         SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_asconf_ack), aack);
1879                 }
1880
1881                 /* process the INIT-ACK info (my info) */
1882                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1883                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1884
1885                 /* pull from vtag hash */
1886                 LIST_REMOVE(stcb, sctp_asocs);
1887                 /* re-insert to new vtag position */
1888                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1889                     SCTP_BASE_INFO(hashasocmark))];
1890                 /*
1891                  * put it in the bucket in the vtag hash of assoc's for the
1892                  * system
1893                  */
1894                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
1895
1896                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
1897                 SCTP_INP_INFO_WUNLOCK();
1898                 asoc->total_flight = 0;
1899                 asoc->total_flight_count = 0;
1900                 /* process the INIT info (peer's info) */
1901                 if (sctp_process_init(init_cp, stcb) < 0) {
1902                         if (how_indx < sizeof(asoc->cookie_how))
1903                                 asoc->cookie_how[how_indx] = 13;
1904                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
1905                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n");
1906                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1907                             src, dst, sh, op_err,
1908                             mflowtype, mflowid,
1909                             vrf_id, net->port);
1910                         return (NULL);
1911                 }
1912                 /*
1913                  * since we did not send a HB make sure we don't double
1914                  * things
1915                  */
1916                 net->hb_responded = 1;
1917
1918                 if ((retval = sctp_load_addresses_from_init(stcb, m,
1919                     init_offset + sizeof(struct sctp_init_chunk),
1920                     initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) {
1921                         if (how_indx < sizeof(asoc->cookie_how))
1922                                 asoc->cookie_how[how_indx] = 14;
1923                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
1924                             "Problem with address parameters");
1925                         SCTPDBG(SCTP_DEBUG_INPUT1,
1926                             "Load addresses from INIT causes an abort %d\n",
1927                             retval);
1928                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1929                             src, dst, sh, op_err,
1930                             mflowtype, mflowid,
1931                             vrf_id, net->port);
1932                         return (NULL);
1933                 }
1934                 /* respond with a COOKIE-ACK */
1935                 sctp_send_cookie_ack(stcb);
1936                 if (how_indx < sizeof(asoc->cookie_how))
1937                         asoc->cookie_how[how_indx] = 15;
1938                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE) &&
1939                     (asoc->sctp_autoclose_ticks > 0)) {
1940                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
1941                 }
1942                 return (stcb);
1943         }
1944         if (how_indx < sizeof(asoc->cookie_how))
1945                 asoc->cookie_how[how_indx] = 16;
1946         /* all other cases... */
1947         SCTP_TCB_UNLOCK(stcb);
1948         return (NULL);
1949 }
1950
1951 /*
1952  * handle a state cookie for a new association m: input packet mbuf chain--
1953  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
1954  * and the cookie signature does not exist offset: offset into mbuf to the
1955  * cookie-echo chunk length: length of the cookie chunk to: where the init
1956  * was from returns a new TCB
1957  */
1958 static struct sctp_tcb *
1959 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1960     struct sockaddr *src, struct sockaddr *dst,
1961     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1962     struct sctp_inpcb *inp, struct sctp_nets **netp,
1963     struct sockaddr *init_src, int *notification,
1964     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1965     uint8_t mflowtype, uint32_t mflowid,
1966     uint32_t vrf_id, uint16_t port)
1967 {
1968         struct sctp_tcb *stcb;
1969         struct sctp_init_chunk *init_cp, init_buf;
1970         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1971         union sctp_sockstore store;
1972         struct sctp_association *asoc;
1973         int init_offset, initack_offset, initack_limit;
1974         int error = 0;
1975         uint8_t auth_chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
1976
1977         /*
1978          * find and validate the INIT chunk in the cookie (peer's info) the
1979          * INIT should start after the cookie-echo header struct (chunk
1980          * header, state cookie header struct)
1981          */
1982         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
1983         init_cp = (struct sctp_init_chunk *)
1984             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1985             (uint8_t *)&init_buf);
1986         if (init_cp == NULL) {
1987                 /* could not pull a INIT chunk in cookie */
1988                 SCTPDBG(SCTP_DEBUG_INPUT1,
1989                     "process_cookie_new: could not pull INIT chunk hdr\n");
1990                 return (NULL);
1991         }
1992         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1993                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
1994                 return (NULL);
1995         }
1996         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1997         /*
1998          * find and validate the INIT-ACK chunk in the cookie (my info) the
1999          * INIT-ACK follows the INIT chunk
2000          */
2001         initack_cp = (struct sctp_init_ack_chunk *)
2002             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
2003             (uint8_t *)&initack_buf);
2004         if (initack_cp == NULL) {
2005                 /* could not pull INIT-ACK chunk in cookie */
2006                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2007                 return (NULL);
2008         }
2009         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2010                 return (NULL);
2011         }
2012         /*
2013          * NOTE: We can't use the INIT_ACK's chk_length to determine the
2014          * "initack_limit" value.  This is because the chk_length field
2015          * includes the length of the cookie, but the cookie is omitted when
2016          * the INIT and INIT_ACK are tacked onto the cookie...
2017          */
2018         initack_limit = offset + cookie_len;
2019
2020         /*
2021          * now that we know the INIT/INIT-ACK are in place, create a new TCB
2022          * and populate
2023          */
2024
2025         /*
2026          * Here we do a trick, we set in NULL for the proc/thread argument.
2027          * We do this since in effect we only use the p argument when the
2028          * socket is unbound and we must do an implicit bind. Since we are
2029          * getting a cookie, we cannot be unbound.
2030          */
2031         stcb = sctp_aloc_assoc(inp, init_src, &error,
2032             ntohl(initack_cp->init.initiate_tag),
2033             ntohl(initack_cp->init.initial_tsn), vrf_id,
2034             ntohs(initack_cp->init.num_outbound_streams),
2035             port,
2036             (struct thread *)NULL,
2037             SCTP_DONT_INITIALIZE_AUTH_PARAMS);
2038         if (stcb == NULL) {
2039                 struct mbuf *op_err;
2040
2041                 /* memory problem? */
2042                 SCTPDBG(SCTP_DEBUG_INPUT1,
2043                     "process_cookie_new: no room for another TCB!\n");
2044                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2045                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2046                     src, dst, sh, op_err,
2047                     mflowtype, mflowid,
2048                     vrf_id, port);
2049                 return (NULL);
2050         }
2051         asoc = &stcb->asoc;
2052         /* get scope variables out of cookie */
2053         asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
2054         asoc->scope.site_scope = cookie->site_scope;
2055         asoc->scope.local_scope = cookie->local_scope;
2056         asoc->scope.loopback_scope = cookie->loopback_scope;
2057
2058         if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2059             (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2060                 struct mbuf *op_err;
2061
2062                 /*
2063                  * Houston we have a problem. The EP changed while the
2064                  * cookie was in flight. Only recourse is to abort the
2065                  * association.
2066                  */
2067                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2068                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2069                     src, dst, sh, op_err,
2070                     mflowtype, mflowid,
2071                     vrf_id, port);
2072                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2073                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2074                 return (NULL);
2075         }
2076         /* process the INIT-ACK info (my info) */
2077         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2078
2079         /* process the INIT info (peer's info) */
2080         if (sctp_process_init(init_cp, stcb) < 0) {
2081                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2082                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2083                 return (NULL);
2084         }
2085         /* load all addresses */
2086         if (sctp_load_addresses_from_init(stcb, m,
2087             init_offset + sizeof(struct sctp_init_chunk),
2088             initack_offset, src, dst, init_src, port) < 0) {
2089                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2090                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2091                 return (NULL);
2092         }
2093         /*
2094          * verify any preceding AUTH chunk that was skipped
2095          */
2096         /* pull the local authentication parameters from the cookie/init-ack */
2097         sctp_auth_get_cookie_params(stcb, m,
2098             initack_offset + sizeof(struct sctp_init_ack_chunk),
2099             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2100         if (auth_skipped) {
2101                 struct sctp_auth_chunk *auth;
2102
2103                 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) {
2104                         auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2105                 } else {
2106                         auth = NULL;
2107                 }
2108                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2109                         /* auth HMAC failed, dump the assoc and packet */
2110                         SCTPDBG(SCTP_DEBUG_AUTH1,
2111                             "COOKIE-ECHO: AUTH failed\n");
2112                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2113                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_21);
2114                         return (NULL);
2115                 } else {
2116                         /* remaining chunks checked... good to go */
2117                         stcb->asoc.authenticated = 1;
2118                 }
2119         }
2120
2121         /*
2122          * if we're doing ASCONFs, check to see if we have any new local
2123          * addresses that need to get added to the peer (eg. addresses
2124          * changed while cookie echo in flight).  This needs to be done
2125          * after we go to the OPEN state to do the correct asconf
2126          * processing. else, make sure we have the correct addresses in our
2127          * lists
2128          */
2129
2130         /* warning, we re-use sin, sin6, sa_store here! */
2131         /* pull in local_address (our "from" address) */
2132         switch (cookie->laddr_type) {
2133 #ifdef INET
2134         case SCTP_IPV4_ADDRESS:
2135                 /* source addr is IPv4 */
2136                 memset(&store.sin, 0, sizeof(struct sockaddr_in));
2137                 store.sin.sin_family = AF_INET;
2138                 store.sin.sin_len = sizeof(struct sockaddr_in);
2139                 store.sin.sin_addr.s_addr = cookie->laddress[0];
2140                 break;
2141 #endif
2142 #ifdef INET6
2143         case SCTP_IPV6_ADDRESS:
2144                 /* source addr is IPv6 */
2145                 memset(&store.sin6, 0, sizeof(struct sockaddr_in6));
2146                 store.sin6.sin6_family = AF_INET6;
2147                 store.sin6.sin6_len = sizeof(struct sockaddr_in6);
2148                 store.sin6.sin6_scope_id = cookie->scope_id;
2149                 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr));
2150                 break;
2151 #endif
2152         default:
2153                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2154                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
2155                 return (NULL);
2156         }
2157
2158         /* update current state */
2159         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2160         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
2161         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2162                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2163                     stcb->sctp_ep, stcb, NULL);
2164         }
2165         sctp_stop_all_cookie_timers(stcb);
2166         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2167         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2168
2169         /* set up to notify upper layer */
2170         *notification = SCTP_NOTIFY_ASSOC_UP;
2171         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2172             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2173             (!SCTP_IS_LISTENING(inp))) {
2174                 /*
2175                  * This is an endpoint that called connect() how it got a
2176                  * cookie that is NEW is a bit of a mystery. It must be that
2177                  * the INIT was sent, but before it got there.. a complete
2178                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2179                  * should have went to the other code.. not here.. oh well..
2180                  * a bit of protection is worth having..
2181                  *
2182                  * XXXMJ unlocked
2183                  */
2184                 sctp_pcb_add_flags(stcb->sctp_ep, SCTP_PCB_FLAGS_CONNECTED);
2185                 soisconnected(stcb->sctp_socket);
2186         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2187             (SCTP_IS_LISTENING(inp))) {
2188                 /*
2189                  * We don't want to do anything with this one. Since it is
2190                  * the listening guy. The timer will get started for
2191                  * accepted connections in the caller.
2192                  */
2193                 ;
2194         }
2195         if (stcb->asoc.sctp_autoclose_ticks &&
2196             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2197                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2198         }
2199         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2200         *netp = sctp_findnet(stcb, init_src);
2201         if (*netp != NULL) {
2202                 struct timeval old;
2203
2204                 /*
2205                  * Since we did not send a HB, make sure we don't double
2206                  * things.
2207                  */
2208                 (*netp)->hb_responded = 1;
2209                 /* Calculate the RTT. */
2210                 old.tv_sec = cookie->time_entered.tv_sec;
2211                 old.tv_usec = cookie->time_entered.tv_usec;
2212                 sctp_calculate_rto(stcb, asoc, *netp, &old, SCTP_RTT_FROM_NON_DATA);
2213         }
2214         /* respond with a COOKIE-ACK */
2215         sctp_send_cookie_ack(stcb);
2216
2217         /*
2218          * check the address lists for any ASCONFs that need to be sent
2219          * AFTER the cookie-ack is sent
2220          */
2221         sctp_check_address_list(stcb, m,
2222             initack_offset + sizeof(struct sctp_init_ack_chunk),
2223             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2224             &store.sa, cookie->local_scope, cookie->site_scope,
2225             cookie->ipv4_scope, cookie->loopback_scope);
2226
2227         return (stcb);
2228 }
2229
2230 /*
2231  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2232  * we NEED to make sure we are not already using the vtag. If so we
2233  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2234         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2235                                                             SCTP_BASE_INFO(hashasocmark))];
2236         LIST_FOREACH(stcb, head, sctp_asocs) {
2237                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) {
2238                        -- SEND ABORT - TRY AGAIN --
2239                 }
2240         }
2241 */
2242
2243 /*
2244  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2245  * existing (non-NULL) TCB
2246  */
2247 static struct mbuf *
2248 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2249     struct sockaddr *src, struct sockaddr *dst,
2250     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2251     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2252     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2253     struct sctp_tcb **locked_tcb,
2254     uint8_t mflowtype, uint32_t mflowid,
2255     uint32_t vrf_id, uint16_t port)
2256 {
2257         struct sctp_state_cookie *cookie;
2258         struct sctp_tcb *l_stcb = *stcb;
2259         struct sctp_inpcb *l_inp;
2260         struct sockaddr *to;
2261         struct sctp_pcb *ep;
2262         struct mbuf *m_sig;
2263         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2264         uint8_t *sig;
2265         uint8_t cookie_ok = 0;
2266         unsigned int sig_offset, cookie_offset;
2267         unsigned int cookie_len;
2268         struct timeval now;
2269         struct timeval time_entered, time_expires;
2270         int notification = 0;
2271         struct sctp_nets *netl;
2272         int had_a_existing_tcb = 0;
2273         int send_int_conf = 0;
2274 #ifdef INET
2275         struct sockaddr_in sin;
2276 #endif
2277 #ifdef INET6
2278         struct sockaddr_in6 sin6;
2279 #endif
2280
2281         SCTPDBG(SCTP_DEBUG_INPUT2,
2282             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2283
2284         if (inp_p == NULL) {
2285                 return (NULL);
2286         }
2287         cookie = &cp->cookie;
2288         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2289         cookie_len = ntohs(cp->ch.chunk_length);
2290
2291         if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2292             sizeof(struct sctp_init_chunk) +
2293             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2294                 /* cookie too small */
2295                 return (NULL);
2296         }
2297         if ((cookie->peerport != sh->src_port) ||
2298             (cookie->myport != sh->dest_port) ||
2299             (cookie->my_vtag != sh->v_tag)) {
2300                 /*
2301                  * invalid ports or bad tag.  Note that we always leave the
2302                  * v_tag in the header in network order and when we stored
2303                  * it in the my_vtag slot we also left it in network order.
2304                  * This maintains the match even though it may be in the
2305                  * opposite byte order of the machine :->
2306                  */
2307                 return (NULL);
2308         }
2309         /*
2310          * split off the signature into its own mbuf (since it should not be
2311          * calculated in the sctp_hmac_m() call).
2312          */
2313         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2314         m_sig = m_split(m, sig_offset, M_NOWAIT);
2315         if (m_sig == NULL) {
2316                 /* out of memory or ?? */
2317                 return (NULL);
2318         }
2319 #ifdef SCTP_MBUF_LOGGING
2320         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2321                 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT);
2322         }
2323 #endif
2324
2325         /*
2326          * compute the signature/digest for the cookie
2327          */
2328         if (l_stcb != NULL) {
2329                 atomic_add_int(&l_stcb->asoc.refcnt, 1);
2330                 SCTP_TCB_UNLOCK(l_stcb);
2331         }
2332         l_inp = *inp_p;
2333         SCTP_INP_RLOCK(l_inp);
2334         if (l_stcb != NULL) {
2335                 SCTP_TCB_LOCK(l_stcb);
2336                 atomic_subtract_int(&l_stcb->asoc.refcnt, 1);
2337         }
2338         if (l_inp->sctp_flags & (SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
2339                 SCTP_INP_RUNLOCK(l_inp);
2340                 sctp_m_freem(m_sig);
2341                 return (NULL);
2342         }
2343         ep = &(*inp_p)->sctp_ep;
2344         /* which cookie is it? */
2345         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2346             (ep->current_secret_number != ep->last_secret_number)) {
2347                 /* it's the old cookie */
2348                 (void)sctp_hmac_m(SCTP_HMAC,
2349                     (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2350                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2351         } else {
2352                 /* it's the current cookie */
2353                 (void)sctp_hmac_m(SCTP_HMAC,
2354                     (uint8_t *)ep->secret_key[(int)ep->current_secret_number],
2355                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2356         }
2357         /* get the signature */
2358         SCTP_INP_RUNLOCK(l_inp);
2359         sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig);
2360         if (sig == NULL) {
2361                 /* couldn't find signature */
2362                 sctp_m_freem(m_sig);
2363                 return (NULL);
2364         }
2365         /* compare the received digest with the computed digest */
2366         if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2367                 /* try the old cookie? */
2368                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2369                     (ep->current_secret_number != ep->last_secret_number)) {
2370                         /* compute digest with old */
2371                         (void)sctp_hmac_m(SCTP_HMAC,
2372                             (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2373                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2374                         /* compare */
2375                         if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2376                                 cookie_ok = 1;
2377                 }
2378         } else {
2379                 cookie_ok = 1;
2380         }
2381
2382         /*
2383          * Now before we continue we must reconstruct our mbuf so that
2384          * normal processing of any other chunks will work.
2385          */
2386         {
2387                 struct mbuf *m_at;
2388
2389                 m_at = m;
2390                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2391                         m_at = SCTP_BUF_NEXT(m_at);
2392                 }
2393                 SCTP_BUF_NEXT(m_at) = m_sig;
2394         }
2395
2396         if (cookie_ok == 0) {
2397                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2398                 SCTPDBG(SCTP_DEBUG_INPUT2,
2399                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2400                     (uint32_t)offset, cookie_offset, sig_offset);
2401                 return (NULL);
2402         }
2403
2404         if (sctp_ticks_to_msecs(cookie->cookie_life) > SCTP_MAX_COOKIE_LIFE) {
2405                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: Invalid cookie lifetime\n");
2406                 return (NULL);
2407         }
2408         time_entered.tv_sec = cookie->time_entered.tv_sec;
2409         time_entered.tv_usec = cookie->time_entered.tv_usec;
2410         if ((time_entered.tv_sec < 0) ||
2411             (time_entered.tv_usec < 0) ||
2412             (time_entered.tv_usec >= 1000000)) {
2413                 /* Invalid time stamp. Cookie must have been modified. */
2414                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: Invalid time stamp\n");
2415                 return (NULL);
2416         }
2417         (void)SCTP_GETTIME_TIMEVAL(&now);
2418         if (timevalcmp(&now, &time_entered, <)) {
2419                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie generated in the future!\n");
2420                 return (NULL);
2421         }
2422         /*
2423          * Check the cookie timestamps to be sure it's not stale.
2424          * cookie_life is in ticks, so we convert to seconds.
2425          */
2426         time_expires.tv_sec = time_entered.tv_sec + sctp_ticks_to_secs(cookie->cookie_life);
2427         time_expires.tv_usec = time_entered.tv_usec;
2428         if (timevalcmp(&now, &time_expires, >)) {
2429                 /* cookie is stale! */
2430                 struct mbuf *op_err;
2431                 struct sctp_error_stale_cookie *cause;
2432                 struct timeval diff;
2433                 uint32_t staleness;
2434
2435                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie),
2436                     0, M_NOWAIT, 1, MT_DATA);
2437                 if (op_err == NULL) {
2438                         /* FOOBAR */
2439                         return (NULL);
2440                 }
2441                 /* Set the len */
2442                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie);
2443                 cause = mtod(op_err, struct sctp_error_stale_cookie *);
2444                 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE);
2445                 cause->cause.length = htons(sizeof(struct sctp_error_stale_cookie));
2446                 diff = now;
2447                 timevalsub(&diff, &time_expires);
2448                 if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) {
2449                         staleness = UINT32_MAX;
2450                 } else {
2451                         staleness = (uint32_t)diff.tv_sec * 1000000;
2452                 }
2453                 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) {
2454                         staleness += (uint32_t)diff.tv_usec;
2455                 } else {
2456                         staleness = UINT32_MAX;
2457                 }
2458                 cause->stale_time = htonl(staleness);
2459                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
2460                     mflowtype, mflowid, l_inp->fibnum,
2461                     vrf_id, port);
2462                 return (NULL);
2463         }
2464         /*
2465          * Now we must see with the lookup address if we have an existing
2466          * asoc. This will only happen if we were in the COOKIE-WAIT state
2467          * and a INIT collided with us and somewhere the peer sent the
2468          * cookie on another address besides the single address our assoc
2469          * had for him. In this case we will have one of the tie-tags set at
2470          * least AND the address field in the cookie can be used to look it
2471          * up.
2472          */
2473         to = NULL;
2474         switch (cookie->addr_type) {
2475 #ifdef INET6
2476         case SCTP_IPV6_ADDRESS:
2477                 memset(&sin6, 0, sizeof(sin6));
2478                 sin6.sin6_family = AF_INET6;
2479                 sin6.sin6_len = sizeof(sin6);
2480                 sin6.sin6_port = sh->src_port;
2481                 sin6.sin6_scope_id = cookie->scope_id;
2482                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2483                     sizeof(sin6.sin6_addr.s6_addr));
2484                 to = (struct sockaddr *)&sin6;
2485                 break;
2486 #endif
2487 #ifdef INET
2488         case SCTP_IPV4_ADDRESS:
2489                 memset(&sin, 0, sizeof(sin));
2490                 sin.sin_family = AF_INET;
2491                 sin.sin_len = sizeof(sin);
2492                 sin.sin_port = sh->src_port;
2493                 sin.sin_addr.s_addr = cookie->address[0];
2494                 to = (struct sockaddr *)&sin;
2495                 break;
2496 #endif
2497         default:
2498                 /* This should not happen */
2499                 return (NULL);
2500         }
2501         if (*stcb == NULL) {
2502                 /* Yep, lets check */
2503                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
2504                 if (*stcb == NULL) {
2505                         /*
2506                          * We should have only got back the same inp. If we
2507                          * got back a different ep we have a problem. The
2508                          * original findep got back l_inp and now
2509                          */
2510                         if (l_inp != *inp_p) {
2511                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2512                         }
2513                 } else {
2514                         if (*locked_tcb == NULL) {
2515                                 /*
2516                                  * In this case we found the assoc only
2517                                  * after we locked the create lock. This
2518                                  * means we are in a colliding case and we
2519                                  * must make sure that we unlock the tcb if
2520                                  * its one of the cases where we throw away
2521                                  * the incoming packets.
2522                                  */
2523                                 *locked_tcb = *stcb;
2524
2525                                 /*
2526                                  * We must also increment the inp ref count
2527                                  * since the ref_count flags was set when we
2528                                  * did not find the TCB, now we found it
2529                                  * which reduces the refcount.. we must
2530                                  * raise it back out to balance it all :-)
2531                                  */
2532                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2533                                 if ((*stcb)->sctp_ep != l_inp) {
2534                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2535                                             (void *)(*stcb)->sctp_ep, (void *)l_inp);
2536                                 }
2537                         }
2538                 }
2539         }
2540
2541         cookie_len -= SCTP_SIGNATURE_SIZE;
2542         if (*stcb == NULL) {
2543                 /* this is the "normal" case... get a new TCB */
2544                 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
2545                     cookie, cookie_len, *inp_p,
2546                     netp, to, &notification,
2547                     auth_skipped, auth_offset, auth_len,
2548                     mflowtype, mflowid,
2549                     vrf_id, port);
2550         } else {
2551                 /* this is abnormal... cookie-echo on existing TCB */
2552                 had_a_existing_tcb = 1;
2553                 *stcb = sctp_process_cookie_existing(m, iphlen, offset,
2554                     src, dst, sh,
2555                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2556                     &notification, auth_skipped, auth_offset, auth_len,
2557                     mflowtype, mflowid,
2558                     vrf_id, port);
2559                 if (*stcb == NULL) {
2560                         *locked_tcb = NULL;
2561                 }
2562         }
2563
2564         if (*stcb == NULL) {
2565                 /* still no TCB... must be bad cookie-echo */
2566                 return (NULL);
2567         }
2568         if (*netp != NULL) {
2569                 (*netp)->flowtype = mflowtype;
2570                 (*netp)->flowid = mflowid;
2571         }
2572         /*
2573          * Ok, we built an association so confirm the address we sent the
2574          * INIT-ACK to.
2575          */
2576         netl = sctp_findnet(*stcb, to);
2577         /*
2578          * This code should in theory NOT run but
2579          */
2580         if (netl == NULL) {
2581                 /* TSNH! Huh, why do I need to add this address here? */
2582                 if (sctp_add_remote_addr(*stcb, to, NULL, port,
2583                     SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2584                         return (NULL);
2585                 }
2586                 netl = sctp_findnet(*stcb, to);
2587         }
2588         if (netl) {
2589                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2590                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2591                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2592                             netl);
2593                         send_int_conf = 1;
2594                 }
2595         }
2596         sctp_start_net_timers(*stcb);
2597         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2598                 if (!had_a_existing_tcb ||
2599                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2600                         /*
2601                          * If we have a NEW cookie or the connect never
2602                          * reached the connected state during collision we
2603                          * must do the TCP accept thing.
2604                          */
2605                         struct socket *so, *oso;
2606                         struct sctp_inpcb *inp;
2607
2608                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2609                                 /*
2610                                  * For a restart we will keep the same
2611                                  * socket, no need to do anything. I THINK!!
2612                                  */
2613                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2614                                 if (send_int_conf) {
2615                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2616                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2617                                 }
2618                                 return (m);
2619                         }
2620                         oso = (*inp_p)->sctp_socket;
2621                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2622                         SCTP_TCB_UNLOCK((*stcb));
2623                         CURVNET_SET(oso->so_vnet);
2624                         so = sonewconn(oso, 0
2625                             );
2626                         CURVNET_RESTORE();
2627                         SCTP_TCB_LOCK((*stcb));
2628                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2629
2630                         if (so == NULL) {
2631                                 struct mbuf *op_err;
2632
2633                                 /* Too many sockets */
2634                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2635                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2636                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2637                                     src, dst, sh, op_err,
2638                                     mflowtype, mflowid,
2639                                     vrf_id, port);
2640                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC,
2641                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
2642                                 return (NULL);
2643                         }
2644                         inp = (struct sctp_inpcb *)so->so_pcb;
2645                         SCTP_INP_INCR_REF(inp);
2646                         /*
2647                          * We add the unbound flag here so that if we get an
2648                          * soabort() before we get the move_pcb done, we
2649                          * will properly cleanup.
2650                          */
2651                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2652                             SCTP_PCB_FLAGS_CONNECTED |
2653                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2654                             SCTP_PCB_FLAGS_UNBOUND |
2655                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2656                             SCTP_PCB_FLAGS_DONT_WAKE);
2657                         inp->sctp_features = (*inp_p)->sctp_features;
2658                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2659                         inp->sctp_socket = so;
2660                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2661                         inp->max_cwnd = (*inp_p)->max_cwnd;
2662                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2663                         inp->ecn_supported = (*inp_p)->ecn_supported;
2664                         inp->prsctp_supported = (*inp_p)->prsctp_supported;
2665                         inp->auth_supported = (*inp_p)->auth_supported;
2666                         inp->asconf_supported = (*inp_p)->asconf_supported;
2667                         inp->reconfig_supported = (*inp_p)->reconfig_supported;
2668                         inp->nrsack_supported = (*inp_p)->nrsack_supported;
2669                         inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
2670                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2671                         inp->sctp_context = (*inp_p)->sctp_context;
2672                         inp->local_strreset_support = (*inp_p)->local_strreset_support;
2673                         inp->fibnum = (*inp_p)->fibnum;
2674                         /*
2675                          * copy in the authentication parameters from the
2676                          * original endpoint
2677                          */
2678                         if (inp->sctp_ep.local_hmacs)
2679                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2680                         inp->sctp_ep.local_hmacs =
2681                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2682                         if (inp->sctp_ep.local_auth_chunks)
2683                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2684                         inp->sctp_ep.local_auth_chunks =
2685                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2686
2687                         /*
2688                          * Now we must move it from one hash table to
2689                          * another and get the tcb in the right place.
2690                          */
2691
2692                         /*
2693                          * This is where the one-2-one socket is put into
2694                          * the accept state waiting for the accept!
2695                          */
2696                         if (*stcb) {
2697                                 SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE);
2698                         }
2699                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2700
2701                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2702                         SCTP_TCB_UNLOCK((*stcb));
2703
2704                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2705                             0);
2706                         SCTP_TCB_LOCK((*stcb));
2707                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2708
2709                         /*
2710                          * now we must check to see if we were aborted while
2711                          * the move was going on and the lock/unlock
2712                          * happened.
2713                          */
2714                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2715                                 /*
2716                                  * yep it was, we leave the assoc attached
2717                                  * to the socket since the sctp_inpcb_free()
2718                                  * call will send an abort for us.
2719                                  */
2720                                 SCTP_INP_DECR_REF(inp);
2721                                 return (NULL);
2722                         }
2723                         SCTP_INP_DECR_REF(inp);
2724                         /* Switch over to the new guy */
2725                         *inp_p = inp;
2726                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2727                         if (send_int_conf) {
2728                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2729                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2730                         }
2731
2732                         /*
2733                          * Pull it from the incomplete queue and wake the
2734                          * guy
2735                          */
2736                         soisconnected(so);
2737                         return (m);
2738                 }
2739         }
2740         if (notification) {
2741                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2742         }
2743         if (send_int_conf) {
2744                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2745                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2746         }
2747         return (m);
2748 }
2749
2750 static void
2751 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2752     struct sctp_tcb *stcb, struct sctp_nets *net)
2753 {
2754         /* cp must not be used, others call this without a c-ack :-) */
2755         struct sctp_association *asoc;
2756         struct sctp_tmit_chunk *chk;
2757
2758         SCTPDBG(SCTP_DEBUG_INPUT2,
2759             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2760         if ((stcb == NULL) || (net == NULL)) {
2761                 return;
2762         }
2763
2764         asoc = &stcb->asoc;
2765         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
2766                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
2767                     asoc->overall_error_count,
2768                     0,
2769                     SCTP_FROM_SCTP_INPUT,
2770                     __LINE__);
2771         }
2772         asoc->overall_error_count = 0;
2773         sctp_stop_all_cookie_timers(stcb);
2774         /* process according to association state */
2775         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) {
2776                 /* state change only needed when I am in right state */
2777                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2778                 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
2779                 sctp_start_net_timers(stcb);
2780                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2781                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2782                             stcb->sctp_ep, stcb, NULL);
2783                 }
2784                 /* update RTO */
2785                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2786                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2787                 if (asoc->overall_error_count == 0) {
2788                         sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered,
2789                             SCTP_RTT_FROM_NON_DATA);
2790                 }
2791                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2792                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2793                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2794                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2795                         sctp_pcb_add_flags(stcb->sctp_ep, SCTP_PCB_FLAGS_CONNECTED);
2796                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
2797                                 soisconnected(stcb->sctp_socket);
2798                         }
2799                 }
2800                 /*
2801                  * since we did not send a HB make sure we don't double
2802                  * things
2803                  */
2804                 net->hb_responded = 1;
2805
2806                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2807                         /*
2808                          * We don't need to do the asconf thing, nor hb or
2809                          * autoclose if the socket is closed.
2810                          */
2811                         goto closed_socket;
2812                 }
2813
2814                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2815                     stcb, net);
2816
2817                 if (stcb->asoc.sctp_autoclose_ticks &&
2818                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2819                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2820                             stcb->sctp_ep, stcb, NULL);
2821                 }
2822                 /*
2823                  * send ASCONF if parameters are pending and ASCONFs are
2824                  * allowed (eg. addresses changed when init/cookie echo were
2825                  * in flight)
2826                  */
2827                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2828                     (stcb->asoc.asconf_supported == 1) &&
2829                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2830 #ifdef SCTP_TIMER_BASED_ASCONF
2831                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2832                             stcb->sctp_ep, stcb,
2833                             stcb->asoc.primary_destination);
2834 #else
2835                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2836                             SCTP_ADDR_NOT_LOCKED);
2837 #endif
2838                 }
2839         }
2840 closed_socket:
2841         /* Toss the cookie if I can */
2842         sctp_toss_old_cookies(stcb, asoc);
2843         /* Restart the timer if we have pending data */
2844         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
2845                 if (chk->whoTo != NULL) {
2846                         break;
2847                 }
2848         }
2849         if (chk != NULL) {
2850                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
2851         }
2852 }
2853
2854 static void
2855 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
2856     struct sctp_tcb *stcb)
2857 {
2858         struct sctp_nets *net;
2859         struct sctp_tmit_chunk *lchk;
2860         struct sctp_ecne_chunk bkup;
2861         uint8_t override_bit;
2862         uint32_t tsn, window_data_tsn;
2863         int len;
2864         unsigned int pkt_cnt;
2865
2866         len = ntohs(cp->ch.chunk_length);
2867         if (len == sizeof(struct old_sctp_ecne_chunk)) {
2868                 /* Its the old format */
2869                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
2870                 bkup.num_pkts_since_cwr = htonl(1);
2871                 cp = &bkup;
2872         }
2873         SCTP_STAT_INCR(sctps_recvecne);
2874         tsn = ntohl(cp->tsn);
2875         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
2876         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
2877         if (lchk == NULL) {
2878                 window_data_tsn = stcb->asoc.sending_seq - 1;
2879         } else {
2880                 window_data_tsn = lchk->rec.data.tsn;
2881         }
2882
2883         /* Find where it was sent to if possible. */
2884         net = NULL;
2885         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
2886                 if (lchk->rec.data.tsn == tsn) {
2887                         net = lchk->whoTo;
2888                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
2889                         break;
2890                 }
2891                 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) {
2892                         break;
2893                 }
2894         }
2895         if (net == NULL) {
2896                 /*
2897                  * What to do. A previous send of a CWR was possibly lost.
2898                  * See how old it is, we may have it marked on the actual
2899                  * net.
2900                  */
2901                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
2902                         if (tsn == net->last_cwr_tsn) {
2903                                 /* Found him, send it off */
2904                                 break;
2905                         }
2906                 }
2907                 if (net == NULL) {
2908                         /*
2909                          * If we reach here, we need to send a special CWR
2910                          * that says hey, we did this a long time ago and
2911                          * you lost the response.
2912                          */
2913                         net = TAILQ_FIRST(&stcb->asoc.nets);
2914                         if (net == NULL) {
2915                                 /* TSNH */
2916                                 return;
2917                         }
2918                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
2919                 } else {
2920                         override_bit = 0;
2921                 }
2922         } else {
2923                 override_bit = 0;
2924         }
2925         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
2926             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
2927                 /*
2928                  * JRS - Use the congestion control given in the pluggable
2929                  * CC module
2930                  */
2931                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
2932                 /*
2933                  * We reduce once every RTT. So we will only lower cwnd at
2934                  * the next sending seq i.e. the window_data_tsn
2935                  */
2936                 net->cwr_window_tsn = window_data_tsn;
2937                 net->ecn_ce_pkt_cnt += pkt_cnt;
2938                 net->lost_cnt = pkt_cnt;
2939                 net->last_cwr_tsn = tsn;
2940         } else {
2941                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
2942                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
2943                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
2944                         /*
2945                          * Another loss in the same window update how many
2946                          * marks/packets lost we have had.
2947                          */
2948                         int cnt = 1;
2949
2950                         if (pkt_cnt > net->lost_cnt) {
2951                                 /* Should be the case */
2952                                 cnt = (pkt_cnt - net->lost_cnt);
2953                                 net->ecn_ce_pkt_cnt += cnt;
2954                         }
2955                         net->lost_cnt = pkt_cnt;
2956                         net->last_cwr_tsn = tsn;
2957                         /*
2958                          * Most CC functions will ignore this call, since we
2959                          * are in-window yet of the initial CE the peer saw.
2960                          */
2961                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
2962                 }
2963         }
2964         /*
2965          * We always send a CWR this way if our previous one was lost our
2966          * peer will get an update, or if it is not time again to reduce we
2967          * still get the cwr to the peer. Note we set the override when we
2968          * could not find the TSN on the chunk or the destination network.
2969          */
2970         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
2971 }
2972
2973 static void
2974 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
2975 {
2976         /*
2977          * Here we get a CWR from the peer. We must look in the outqueue and
2978          * make sure that we have a covered ECNE in the control chunk part.
2979          * If so remove it.
2980          */
2981         struct sctp_tmit_chunk *chk, *nchk;
2982         struct sctp_ecne_chunk *ecne;
2983         int override;
2984         uint32_t cwr_tsn;
2985
2986         cwr_tsn = ntohl(cp->tsn);
2987         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
2988         TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) {
2989                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
2990                         continue;
2991                 }
2992                 if ((override == 0) && (chk->whoTo != net)) {
2993                         /* Must be from the right src unless override is set */
2994                         continue;
2995                 }
2996                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
2997                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
2998                         /* this covers this ECNE, we can remove it */
2999                         stcb->asoc.ecn_echo_cnt_onq--;
3000                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3001                             sctp_next);
3002                         stcb->asoc.ctrl_queue_cnt--;
3003                         sctp_m_freem(chk->data);
3004                         chk->data = NULL;
3005                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3006                         if (override == 0) {
3007                                 break;
3008                         }
3009                 }
3010         }
3011 }
3012
3013 static void
3014 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3015     struct sctp_tcb *stcb, struct sctp_nets *net)
3016 {
3017
3018         SCTPDBG(SCTP_DEBUG_INPUT2,
3019             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3020         if (stcb == NULL)
3021                 return;
3022
3023         /* process according to association state */
3024         if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3025                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3026                 SCTPDBG(SCTP_DEBUG_INPUT2,
3027                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3028                 SCTP_TCB_UNLOCK(stcb);
3029                 return;
3030         }
3031         /* notify upper layer protocol */
3032         if (stcb->sctp_socket) {
3033                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3034         }
3035 #ifdef INVARIANTS
3036         if (!TAILQ_EMPTY(&stcb->asoc.send_queue) ||
3037             !TAILQ_EMPTY(&stcb->asoc.sent_queue) ||
3038             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
3039                 panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
3040         }
3041 #endif
3042         /* stop the timer */
3043         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net,
3044             SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3045         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3046         /* free the TCB */
3047         SCTPDBG(SCTP_DEBUG_INPUT2,
3048             "sctp_handle_shutdown_complete: calls free-asoc\n");
3049         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
3050             SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3051         return;
3052 }
3053
3054 static int
3055 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3056     struct sctp_nets *net, uint8_t flg)
3057 {
3058         switch (desc->chunk_type) {
3059         case SCTP_DATA:
3060         case SCTP_IDATA:
3061                 /* find the tsn to resend (possibly) */
3062                 {
3063                         uint32_t tsn;
3064                         struct sctp_tmit_chunk *tp1;
3065
3066                         tsn = ntohl(desc->tsn_ifany);
3067                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3068                                 if (tp1->rec.data.tsn == tsn) {
3069                                         /* found it */
3070                                         break;
3071                                 }
3072                                 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) {
3073                                         /* not found */
3074                                         tp1 = NULL;
3075                                         break;
3076                                 }
3077                         }
3078                         if (tp1 == NULL) {
3079                                 /*
3080                                  * Do it the other way , aka without paying
3081                                  * attention to queue seq order.
3082                                  */
3083                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3084                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3085                                         if (tp1->rec.data.tsn == tsn) {
3086                                                 /* found it */
3087                                                 break;
3088                                         }
3089                                 }
3090                         }
3091                         if (tp1 == NULL) {
3092                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3093                         }
3094                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3095                                 if (((flg & SCTP_BADCRC) == 0) &&
3096                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3097                                         return (0);
3098                                 }
3099                                 if ((stcb->asoc.peers_rwnd == 0) &&
3100                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3101                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3102                                         return (0);
3103                                 }
3104                                 if (stcb->asoc.peers_rwnd == 0 &&
3105                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3106                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3107                                         return (0);
3108                                 }
3109                                 if ((uint32_t)SCTP_BUF_LEN(tp1->data) <
3110                                     SCTP_DATA_CHUNK_OVERHEAD(stcb) + SCTP_NUM_DB_TO_VERIFY) {
3111                                         /* Payload not matching. */
3112                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3113                                         return (-1);
3114                                 }
3115                                 if (memcmp(mtod(tp1->data, caddr_t)+SCTP_DATA_CHUNK_OVERHEAD(stcb),
3116                                     desc->data_bytes, SCTP_NUM_DB_TO_VERIFY) != 0) {
3117                                         /* Payload not matching. */
3118                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3119                                         return (-1);
3120                                 }
3121                                 if (tp1->do_rtt) {
3122                                         /*
3123                                          * this guy had a RTO calculation
3124                                          * pending on it, cancel it
3125                                          */
3126                                         if (tp1->whoTo->rto_needed == 0) {
3127                                                 tp1->whoTo->rto_needed = 1;
3128                                         }
3129                                         tp1->do_rtt = 0;
3130                                 }
3131                                 SCTP_STAT_INCR(sctps_pdrpmark);
3132                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3133                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3134                                 /*
3135                                  * mark it as if we were doing a FR, since
3136                                  * we will be getting gap ack reports behind
3137                                  * the info from the router.
3138                                  */
3139                                 tp1->rec.data.doing_fast_retransmit = 1;
3140                                 /*
3141                                  * mark the tsn with what sequences can
3142                                  * cause a new FR.
3143                                  */
3144                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3145                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3146                                 } else {
3147                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn;
3148                                 }
3149
3150                                 /* restart the timer */
3151                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3152                                     stcb, tp1->whoTo,
3153                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3154                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3155                                     stcb, tp1->whoTo);
3156
3157                                 /* fix counts and things */
3158                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3159                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3160                                             tp1->whoTo->flight_size,
3161                                             tp1->book_size,
3162                                             (uint32_t)(uintptr_t)stcb,
3163                                             tp1->rec.data.tsn);
3164                                 }
3165                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3166                                         sctp_flight_size_decrease(tp1);
3167                                         sctp_total_flight_decrease(stcb, tp1);
3168                                 }
3169                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3170                         } {
3171                                 /* audit code */
3172                                 unsigned int audit;
3173
3174                                 audit = 0;
3175                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3176                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3177                                                 audit++;
3178                                 }
3179                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3180                                     sctp_next) {
3181                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3182                                                 audit++;
3183                                 }
3184                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3185                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3186                                             audit, stcb->asoc.sent_queue_retran_cnt);
3187 #ifndef SCTP_AUDITING_ENABLED
3188                                         stcb->asoc.sent_queue_retran_cnt = audit;
3189 #endif
3190                                 }
3191                         }
3192                 }
3193                 break;
3194         case SCTP_ASCONF:
3195                 {
3196                         struct sctp_tmit_chunk *asconf;
3197
3198                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3199                             sctp_next) {
3200                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3201                                         break;
3202                                 }
3203                         }
3204                         if (asconf) {
3205                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3206                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3207                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3208                                 asconf->snd_count--;
3209                         }
3210                 }
3211                 break;
3212         case SCTP_INITIATION:
3213                 /* resend the INIT */
3214                 stcb->asoc.dropped_special_cnt++;
3215                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3216                         /*
3217                          * If we can get it in, in a few attempts we do
3218                          * this, otherwise we let the timer fire.
3219                          */
3220                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3221                             stcb, net,
3222                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
3223                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3224                 }
3225                 break;
3226         case SCTP_SELECTIVE_ACK:
3227         case SCTP_NR_SELECTIVE_ACK:
3228                 /* resend the sack */
3229                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3230                 break;
3231         case SCTP_HEARTBEAT_REQUEST:
3232                 /* resend a demand HB */
3233                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3234                         /*
3235                          * Only retransmit if we KNOW we wont destroy the
3236                          * tcb
3237                          */
3238                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3239                 }
3240                 break;
3241         case SCTP_SHUTDOWN:
3242                 sctp_send_shutdown(stcb, net);
3243                 break;
3244         case SCTP_SHUTDOWN_ACK:
3245                 sctp_send_shutdown_ack(stcb, net);
3246                 break;
3247         case SCTP_COOKIE_ECHO:
3248                 {
3249                         struct sctp_tmit_chunk *cookie;
3250
3251                         cookie = NULL;
3252                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3253                             sctp_next) {
3254                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3255                                         break;
3256                                 }
3257                         }
3258                         if (cookie) {
3259                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3260                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3261                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3262                                 sctp_stop_all_cookie_timers(stcb);
3263                         }
3264                 }
3265                 break;
3266         case SCTP_COOKIE_ACK:
3267                 sctp_send_cookie_ack(stcb);
3268                 break;
3269         case SCTP_ASCONF_ACK:
3270                 /* resend last asconf ack */
3271                 sctp_send_asconf_ack(stcb);
3272                 break;
3273         case SCTP_IFORWARD_CUM_TSN:
3274         case SCTP_FORWARD_CUM_TSN:
3275                 send_forward_tsn(stcb, &stcb->asoc);
3276                 break;
3277                 /* can't do anything with these */
3278         case SCTP_PACKET_DROPPED:
3279         case SCTP_INITIATION_ACK:       /* this should not happen */
3280         case SCTP_HEARTBEAT_ACK:
3281         case SCTP_ABORT_ASSOCIATION:
3282         case SCTP_OPERATION_ERROR:
3283         case SCTP_SHUTDOWN_COMPLETE:
3284         case SCTP_ECN_ECHO:
3285         case SCTP_ECN_CWR:
3286         default:
3287                 break;
3288         }
3289         return (0);
3290 }
3291
3292 void
3293 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3294 {
3295         uint32_t i;
3296         uint16_t temp;
3297
3298         /*
3299          * We set things to 0xffffffff since this is the last delivered
3300          * sequence and we will be sending in 0 after the reset.
3301          */
3302
3303         if (number_entries) {
3304                 for (i = 0; i < number_entries; i++) {
3305                         temp = ntohs(list[i]);
3306                         if (temp >= stcb->asoc.streamincnt) {
3307                                 continue;
3308                         }
3309                         stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff;
3310                 }
3311         } else {
3312                 list = NULL;
3313                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3314                         stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
3315                 }
3316         }
3317         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3318 }
3319
3320 static void
3321 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3322 {
3323         uint32_t i;
3324         uint16_t temp;
3325
3326         if (number_entries > 0) {
3327                 for (i = 0; i < number_entries; i++) {
3328                         temp = ntohs(list[i]);
3329                         if (temp >= stcb->asoc.streamoutcnt) {
3330                                 /* no such stream */
3331                                 continue;
3332                         }
3333                         stcb->asoc.strmout[temp].next_mid_ordered = 0;
3334                         stcb->asoc.strmout[temp].next_mid_unordered = 0;
3335                 }
3336         } else {
3337                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3338                         stcb->asoc.strmout[i].next_mid_ordered = 0;
3339                         stcb->asoc.strmout[i].next_mid_unordered = 0;
3340                 }
3341         }
3342         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3343 }
3344
3345 static void
3346 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3347 {
3348         uint32_t i;
3349         uint16_t temp;
3350
3351         if (number_entries > 0) {
3352                 for (i = 0; i < number_entries; i++) {
3353                         temp = ntohs(list[i]);
3354                         if (temp >= stcb->asoc.streamoutcnt) {
3355                                 /* no such stream */
3356                                 continue;
3357                         }
3358                         stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN;
3359                 }
3360         } else {
3361                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3362                         stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN;
3363                 }
3364         }
3365 }
3366
3367 struct sctp_stream_reset_request *
3368 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3369 {
3370         struct sctp_association *asoc;
3371         struct sctp_chunkhdr *ch;
3372         struct sctp_stream_reset_request *r;
3373         struct sctp_tmit_chunk *chk;
3374         int len, clen;
3375
3376         asoc = &stcb->asoc;
3377         chk = asoc->str_reset;
3378         if (TAILQ_EMPTY(&asoc->control_send_queue) ||
3379             (chk == NULL)) {
3380                 asoc->stream_reset_outstanding = 0;
3381                 return (NULL);
3382         }
3383         if (chk->data == NULL) {
3384                 return (NULL);
3385         }
3386         if (bchk != NULL) {
3387                 /* he wants a copy of the chk pointer */
3388                 *bchk = chk;
3389         }
3390         clen = chk->send_size;
3391         ch = mtod(chk->data, struct sctp_chunkhdr *);
3392         r = (struct sctp_stream_reset_request *)(ch + 1);
3393         if (ntohl(r->request_seq) == seq) {
3394                 /* found it */
3395                 return (r);
3396         }
3397         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3398         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3399                 /* move to the next one, there can only be a max of two */
3400                 r = (struct sctp_stream_reset_request *)((caddr_t)r + len);
3401                 if (ntohl(r->request_seq) == seq) {
3402                         return (r);
3403                 }
3404         }
3405         /* that seq is not here */
3406         return (NULL);
3407 }
3408
3409 static void
3410 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3411 {
3412         struct sctp_association *asoc;
3413         struct sctp_tmit_chunk *chk;
3414
3415         asoc = &stcb->asoc;
3416         chk = asoc->str_reset;
3417         if (chk == NULL) {
3418                 return;
3419         }
3420         asoc->str_reset = NULL;
3421         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb,
3422             NULL, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28);
3423         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
3424         asoc->ctrl_queue_cnt--;
3425         if (chk->data) {
3426                 sctp_m_freem(chk->data);
3427                 chk->data = NULL;
3428         }
3429         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3430 }
3431
3432 static int
3433 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3434     uint32_t seq, uint32_t action,
3435     struct sctp_stream_reset_response *respin)
3436 {
3437         uint16_t type;
3438         int lparam_len;
3439         struct sctp_association *asoc = &stcb->asoc;
3440         struct sctp_tmit_chunk *chk;
3441         struct sctp_stream_reset_request *req_param;
3442         struct sctp_stream_reset_out_request *req_out_param;
3443         struct sctp_stream_reset_in_request *req_in_param;
3444         uint32_t number_entries;
3445
3446         if (asoc->stream_reset_outstanding == 0) {
3447                 /* duplicate */
3448                 return (0);
3449         }
3450         if (seq == stcb->asoc.str_reset_seq_out) {
3451                 req_param = sctp_find_stream_reset(stcb, seq, &chk);
3452                 if (req_param != NULL) {
3453                         stcb->asoc.str_reset_seq_out++;
3454                         type = ntohs(req_param->ph.param_type);
3455                         lparam_len = ntohs(req_param->ph.param_length);
3456                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3457                                 int no_clear = 0;
3458
3459                                 req_out_param = (struct sctp_stream_reset_out_request *)req_param;
3460                                 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3461                                 asoc->stream_reset_out_is_outstanding = 0;
3462                                 if (asoc->stream_reset_outstanding)
3463                                         asoc->stream_reset_outstanding--;
3464                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3465                                         /* do it */
3466                                         sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
3467                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3468                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3469                                 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) {
3470                                         /*
3471                                          * Set it up so we don't stop
3472                                          * retransmitting
3473                                          */
3474                                         asoc->stream_reset_outstanding++;
3475                                         stcb->asoc.str_reset_seq_out--;
3476                                         asoc->stream_reset_out_is_outstanding = 1;
3477                                         no_clear = 1;
3478                                 } else {
3479                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3480                                 }
3481                                 if (no_clear == 0) {
3482                                         sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams);
3483                                 }
3484                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3485                                 req_in_param = (struct sctp_stream_reset_in_request *)req_param;
3486                                 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3487                                 if (asoc->stream_reset_outstanding)
3488                                         asoc->stream_reset_outstanding--;
3489                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3490                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3491                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3492                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3493                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3494                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3495                                 }
3496                         } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3497                                 /* Ok we now may have more streams */
3498                                 int num_stream;
3499
3500                                 num_stream = stcb->asoc.strm_pending_add_size;
3501                                 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3502                                         /* TSNH */
3503                                         num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3504                                 }
3505                                 stcb->asoc.strm_pending_add_size = 0;
3506                                 if (asoc->stream_reset_outstanding)
3507                                         asoc->stream_reset_outstanding--;
3508                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3509                                         /* Put the new streams into effect */
3510                                         int i;
3511
3512                                         for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) {
3513                                                 asoc->strmout[i].state = SCTP_STREAM_OPEN;
3514                                         }
3515                                         asoc->streamoutcnt += num_stream;
3516                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3517                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3518                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3519                                             SCTP_STREAM_CHANGE_DENIED);
3520                                 } else {
3521                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3522                                             SCTP_STREAM_CHANGE_FAILED);
3523                                 }
3524                         } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3525                                 if (asoc->stream_reset_outstanding)
3526                                         asoc->stream_reset_outstanding--;
3527                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3528                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3529                                             SCTP_STREAM_CHANGE_DENIED);
3530                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3531                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3532                                             SCTP_STREAM_CHANGE_FAILED);
3533                                 }
3534                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3535                                 /**
3536                                  * a) Adopt the new in tsn.
3537                                  * b) reset the map
3538                                  * c) Adopt the new out-tsn
3539                                  */
3540                                 struct sctp_stream_reset_response_tsn *resp;
3541                                 struct sctp_forward_tsn_chunk fwdtsn;
3542                                 int abort_flag = 0;
3543
3544                                 if (respin == NULL) {
3545                                         /* huh ? */
3546                                         return (0);
3547                                 }
3548                                 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
3549                                         return (0);
3550                                 }
3551                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3552                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3553                                         asoc->stream_reset_outstanding--;
3554                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3555                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3556                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3557                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3558                                         if (abort_flag) {
3559                                                 return (1);
3560                                         }
3561                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3562                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3563                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3564                                         }
3565
3566                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3567                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3568                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3569
3570                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3571                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3572
3573                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3574                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3575
3576                                         sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3577                                         sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3578                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3579                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3580                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3581                                             SCTP_ASSOC_RESET_DENIED);
3582                                 } else {
3583                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3584                                             SCTP_ASSOC_RESET_FAILED);
3585                                 }
3586                         }
3587                         /* get rid of the request and get the request flags */
3588                         if (asoc->stream_reset_outstanding == 0) {
3589                                 sctp_clean_up_stream_reset(stcb);
3590                         }
3591                 }
3592         }
3593         if (asoc->stream_reset_outstanding == 0) {
3594                 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3595         }
3596         return (0);
3597 }
3598
3599 static void
3600 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3601     struct sctp_tmit_chunk *chk,
3602     struct sctp_stream_reset_in_request *req, int trunc)
3603 {
3604         uint32_t seq;
3605         int len, i;
3606         int number_entries;
3607         uint16_t temp;
3608
3609         /*
3610          * peer wants me to send a str-reset to him for my outgoing seq's if
3611          * seq_in is right.
3612          */
3613         struct sctp_association *asoc = &stcb->asoc;
3614
3615         seq = ntohl(req->request_seq);
3616         if (asoc->str_reset_seq_in == seq) {
3617                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3618                 if ((asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ) == 0) {
3619                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3620                 } else if (trunc) {
3621                         /* Can't do it, since they exceeded our buffer size  */
3622                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3623                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3624                         len = ntohs(req->ph.param_length);
3625                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3626                         if (number_entries) {
3627                                 for (i = 0; i < number_entries; i++) {
3628                                         temp = ntohs(req->list_of_streams[i]);
3629                                         if (temp >= stcb->asoc.streamoutcnt) {
3630                                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3631                                                 goto bad_boy;
3632                                         }
3633                                         req->list_of_streams[i] = temp;
3634                                 }
3635                                 for (i = 0; i < number_entries; i++) {
3636                                         if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) {
3637                                                 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING;
3638                                         }
3639                                 }
3640                         } else {
3641                                 /* Its all */
3642                                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3643                                         if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN)
3644                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING;
3645                                 }
3646                         }
3647                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3648                 } else {
3649                         /* Can't do it, since we have sent one out */
3650                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3651                 }
3652 bad_boy:
3653                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3654                 asoc->str_reset_seq_in++;
3655         } else if (asoc->str_reset_seq_in - 1 == seq) {
3656                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3657         } else if (asoc->str_reset_seq_in - 2 == seq) {
3658                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3659         } else {
3660                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3661         }
3662         sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3663 }
3664
3665 static int
3666 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3667     struct sctp_tmit_chunk *chk,
3668     struct sctp_stream_reset_tsn_request *req)
3669 {
3670         /* reset all in and out and update the tsn */
3671         /*
3672          * A) reset my str-seq's on in and out. B) Select a receive next,
3673          * and set cum-ack to it. Also process this selected number as a
3674          * fwd-tsn as well. C) set in the response my next sending seq.
3675          */
3676         struct sctp_forward_tsn_chunk fwdtsn;
3677         struct sctp_association *asoc = &stcb->asoc;
3678         int abort_flag = 0;
3679         uint32_t seq;
3680
3681         seq = ntohl(req->request_seq);
3682         if (asoc->str_reset_seq_in == seq) {
3683                 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3684                 if ((asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ) == 0) {
3685                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3686                 } else {
3687                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3688                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3689                         fwdtsn.ch.chunk_flags = 0;
3690                         fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3691                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3692                         if (abort_flag) {
3693                                 return (1);
3694                         }
3695                         asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3696                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3697                                 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3698                         }
3699                         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3700                         asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3701                         memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3702                         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3703                         memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3704                         atomic_add_int(&asoc->sending_seq, 1);
3705                         /* save off historical data for retrans */
3706                         asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3707                         asoc->last_sending_seq[0] = asoc->sending_seq;
3708                         asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3709                         asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3710                         sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3711                         sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3712                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3713                         sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3714                 }
3715                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3716                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3717                 asoc->str_reset_seq_in++;
3718         } else if (asoc->str_reset_seq_in - 1 == seq) {
3719                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3720                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3721         } else if (asoc->str_reset_seq_in - 2 == seq) {
3722                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3723                     asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3724         } else {
3725                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3726         }
3727         return (0);
3728 }
3729
3730 static void
3731 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3732     struct sctp_tmit_chunk *chk,
3733     struct sctp_stream_reset_out_request *req, int trunc)
3734 {
3735         uint32_t seq, tsn;
3736         int number_entries, len;
3737         struct sctp_association *asoc = &stcb->asoc;
3738
3739         seq = ntohl(req->request_seq);
3740
3741         /* now if its not a duplicate we process it */
3742         if (asoc->str_reset_seq_in == seq) {
3743                 len = ntohs(req->ph.param_length);
3744                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3745                 /*
3746                  * the sender is resetting, handle the list issue.. we must
3747                  * a) verify if we can do the reset, if so no problem b) If
3748                  * we can't do the reset we must copy the request. c) queue
3749                  * it, and setup the data in processor to trigger it off
3750                  * when needed and dequeue all the queued data.
3751                  */
3752                 tsn = ntohl(req->send_reset_at_tsn);
3753
3754                 /* move the reset action back one */
3755                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3756                 if ((asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ) == 0) {
3757                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3758                 } else if (trunc) {
3759                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3760                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3761                         /* we can do it now */
3762                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3763                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3764                 } else {
3765                         /*
3766                          * we must queue it up and thus wait for the TSN's
3767                          * to arrive that are at or before tsn
3768                          */
3769                         struct sctp_stream_reset_list *liste;
3770                         int siz;
3771
3772                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3773                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3774                             siz, SCTP_M_STRESET);
3775                         if (liste == NULL) {
3776                                 /* gak out of memory */
3777                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3778                                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3779                                 return;
3780                         }
3781                         liste->seq = seq;
3782                         liste->tsn = tsn;
3783                         liste->number_entries = number_entries;
3784                         memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
3785                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3786                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS;
3787                 }
3788                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3789                 asoc->str_reset_seq_in++;
3790         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3791                 /*
3792                  * one seq back, just echo back last action since my
3793                  * response was lost.
3794                  */
3795                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3796         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3797                 /*
3798                  * two seq back, just echo back last action since my
3799                  * response was lost.
3800                  */
3801                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3802         } else {
3803                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3804         }
3805 }
3806
3807 static void
3808 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3809     struct sctp_stream_reset_add_strm *str_add)
3810 {
3811         /*
3812          * Peer is requesting to add more streams. If its within our
3813          * max-streams we will allow it.
3814          */
3815         uint32_t num_stream, i;
3816         uint32_t seq;
3817         struct sctp_association *asoc = &stcb->asoc;
3818         struct sctp_queued_to_read *ctl, *nctl;
3819
3820         /* Get the number. */
3821         seq = ntohl(str_add->request_seq);
3822         num_stream = ntohs(str_add->number_of_streams);
3823         /* Now what would be the new total? */
3824         if (asoc->str_reset_seq_in == seq) {
3825                 num_stream += stcb->asoc.streamincnt;
3826                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3827                 if ((asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ) == 0) {
3828                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3829                 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
3830                     (num_stream > 0xffff)) {
3831                         /* We must reject it they ask for to many */
3832         denied:
3833                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3834                 } else {
3835                         /* Ok, we can do that :-) */
3836                         struct sctp_stream_in *oldstrm;
3837
3838                         /* save off the old */
3839                         oldstrm = stcb->asoc.strmin;
3840                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
3841                             (num_stream * sizeof(struct sctp_stream_in)),
3842                             SCTP_M_STRMI);
3843                         if (stcb->asoc.strmin == NULL) {
3844                                 stcb->asoc.strmin = oldstrm;
3845                                 goto denied;
3846                         }
3847                         /* copy off the old data */
3848                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
3849                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3850                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
3851                                 stcb->asoc.strmin[i].sid = i;
3852                                 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered;
3853                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
3854                                 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started;
3855                                 /* now anything on those queues? */
3856                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) {
3857                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm);
3858                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm);
3859                                 }
3860                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) {
3861                                         TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm);
3862                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm);
3863                                 }
3864                         }
3865                         /* Init the new streams */
3866                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
3867                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3868                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
3869                                 stcb->asoc.strmin[i].sid = i;
3870                                 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
3871                                 stcb->asoc.strmin[i].pd_api_started = 0;
3872                                 stcb->asoc.strmin[i].delivery_started = 0;
3873                         }
3874                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
3875                         /* update the size */
3876                         stcb->asoc.streamincnt = num_stream;
3877                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3878                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3879                 }
3880                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3881                 asoc->str_reset_seq_in++;
3882         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3883                 /*
3884                  * one seq back, just echo back last action since my
3885                  * response was lost.
3886                  */
3887                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3888         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3889                 /*
3890                  * two seq back, just echo back last action since my
3891                  * response was lost.
3892                  */
3893                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3894         } else {
3895                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3896         }
3897 }
3898
3899 static void
3900 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3901     struct sctp_stream_reset_add_strm *str_add)
3902 {
3903         /*
3904          * Peer is requesting to add more streams. If its within our
3905          * max-streams we will allow it.
3906          */
3907         uint16_t num_stream;
3908         uint32_t seq;
3909         struct sctp_association *asoc = &stcb->asoc;
3910
3911         /* Get the number. */
3912         seq = ntohl(str_add->request_seq);
3913         num_stream = ntohs(str_add->number_of_streams);
3914         /* Now what would be the new total? */
3915         if (asoc->str_reset_seq_in == seq) {
3916                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3917                 if ((asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ) == 0) {
3918                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3919                 } else if (stcb->asoc.stream_reset_outstanding) {
3920                         /* We must reject it we have something pending */
3921                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3922                 } else {
3923                         /* Ok, we can do that :-) */
3924                         int mychk;
3925
3926                         mychk = stcb->asoc.streamoutcnt;
3927                         mychk += num_stream;
3928                         if (mychk < 0x10000) {
3929                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3930                                 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) {
3931                                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3932                                 }
3933                         } else {
3934                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3935                         }
3936                 }
3937                 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
3938                 asoc->str_reset_seq_in++;
3939         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3940                 /*
3941                  * one seq back, just echo back last action since my
3942                  * response was lost.
3943                  */
3944                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3945         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3946                 /*
3947                  * two seq back, just echo back last action since my
3948                  * response was lost.
3949                  */
3950                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3951         } else {
3952                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3953         }
3954 }
3955
3956 #ifdef __GNUC__
3957 __attribute__((noinline))
3958 #endif
3959 static int
3960 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
3961     struct sctp_chunkhdr *ch_req)
3962 {
3963         uint16_t remaining_length, param_len, ptype;
3964         struct sctp_paramhdr pstore;
3965         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
3966         uint32_t seq = 0;
3967         int num_req = 0;
3968         int trunc = 0;
3969         struct sctp_tmit_chunk *chk;
3970         struct sctp_chunkhdr *ch;
3971         struct sctp_paramhdr *ph;
3972         int ret_code = 0;
3973         int num_param = 0;
3974
3975         /* now it may be a reset or a reset-response */
3976         remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
3977
3978         /* setup for adding the response */
3979         sctp_alloc_a_chunk(stcb, chk);
3980         if (chk == NULL) {
3981                 return (ret_code);
3982         }
3983         chk->copy_by_ref = 0;
3984         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
3985         chk->rec.chunk_id.can_take_data = 0;
3986         chk->flags = 0;
3987         chk->asoc = &stcb->asoc;
3988         chk->no_fr_allowed = 0;
3989         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
3990         chk->book_size_scale = 0;
3991         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
3992         if (chk->data == NULL) {
3993 strres_nochunk:
3994                 if (chk->data) {
3995                         sctp_m_freem(chk->data);
3996                         chk->data = NULL;
3997                 }
3998                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3999                 return (ret_code);
4000         }
4001         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
4002
4003         /* setup chunk parameters */
4004         chk->sent = SCTP_DATAGRAM_UNSENT;
4005         chk->snd_count = 0;
4006         chk->whoTo = NULL;
4007
4008         ch = mtod(chk->data, struct sctp_chunkhdr *);
4009         ch->chunk_type = SCTP_STREAM_RESET;
4010         ch->chunk_flags = 0;
4011         ch->chunk_length = htons(chk->send_size);
4012         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4013         offset += sizeof(struct sctp_chunkhdr);
4014         while (remaining_length >= sizeof(struct sctp_paramhdr)) {
4015                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore);
4016                 if (ph == NULL) {
4017                         /* TSNH */
4018                         break;
4019                 }
4020                 param_len = ntohs(ph->param_length);
4021                 if ((param_len > remaining_length) ||
4022                     (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
4023                         /* bad parameter length */
4024                         break;
4025                 }
4026                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
4027                     (uint8_t *)&cstore);
4028                 if (ph == NULL) {
4029                         /* TSNH */
4030                         break;
4031                 }
4032                 ptype = ntohs(ph->param_type);
4033                 num_param++;
4034                 if (param_len > sizeof(cstore)) {
4035                         trunc = 1;
4036                 } else {
4037                         trunc = 0;
4038                 }
4039                 if (num_param > SCTP_MAX_RESET_PARAMS) {
4040                         /* hit the max of parameters already sorry.. */
4041                         break;
4042                 }
4043                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4044                         struct sctp_stream_reset_out_request *req_out;
4045
4046                         if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
4047                                 break;
4048                         }
4049                         req_out = (struct sctp_stream_reset_out_request *)ph;
4050                         num_req++;
4051                         if (stcb->asoc.stream_reset_outstanding) {
4052                                 seq = ntohl(req_out->response_seq);
4053                                 if (seq == stcb->asoc.str_reset_seq_out) {
4054                                         /* implicit ack */
4055                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4056                                 }
4057                         }
4058                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4059                 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4060                         struct sctp_stream_reset_add_strm *str_add;
4061
4062                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4063                                 break;
4064                         }
4065                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4066                         num_req++;
4067                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4068                 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4069                         struct sctp_stream_reset_add_strm *str_add;
4070
4071                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4072                                 break;
4073                         }
4074                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4075                         num_req++;
4076                         sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4077                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4078                         struct sctp_stream_reset_in_request *req_in;
4079
4080                         num_req++;
4081                         req_in = (struct sctp_stream_reset_in_request *)ph;
4082                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4083                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4084                         struct sctp_stream_reset_tsn_request *req_tsn;
4085
4086                         num_req++;
4087                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4088                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4089                                 ret_code = 1;
4090                                 goto strres_nochunk;
4091                         }
4092                         /* no more */
4093                         break;
4094                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4095                         struct sctp_stream_reset_response *resp;
4096                         uint32_t result;
4097
4098                         if (param_len < sizeof(struct sctp_stream_reset_response)) {
4099                                 break;
4100                         }
4101                         resp = (struct sctp_stream_reset_response *)ph;
4102                         seq = ntohl(resp->response_seq);
4103                         result = ntohl(resp->result);
4104                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4105                                 ret_code = 1;
4106                                 goto strres_nochunk;
4107                         }
4108                 } else {
4109                         break;
4110                 }
4111                 offset += SCTP_SIZE32(param_len);
4112                 if (remaining_length >= SCTP_SIZE32(param_len)) {
4113                         remaining_length -= SCTP_SIZE32(param_len);
4114                 } else {
4115                         remaining_length = 0;
4116                 }
4117         }
4118         if (num_req == 0) {
4119                 /* we have no response free the stuff */
4120                 goto strres_nochunk;
4121         }
4122         /* ok we have a chunk to link in */
4123         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4124             chk,
4125             sctp_next);
4126         stcb->asoc.ctrl_queue_cnt++;
4127         return (ret_code);
4128 }
4129
4130 /*
4131  * Handle a router or endpoints report of a packet loss, there are two ways
4132  * to handle this, either we get the whole packet and must disect it
4133  * ourselves (possibly with truncation and or corruption) or it is a summary
4134  * from a middle box that did the disecting for us.
4135  */
4136 static void
4137 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4138     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4139 {
4140         struct sctp_chunk_desc desc;
4141         struct sctp_chunkhdr *chk_hdr;
4142         struct sctp_data_chunk *data_chunk;
4143         struct sctp_idata_chunk *idata_chunk;
4144         uint32_t bottle_bw, on_queue;
4145         uint32_t offset, chk_len;
4146         uint16_t pktdrp_len;
4147         uint8_t pktdrp_flags;
4148
4149         KASSERT(sizeof(struct sctp_pktdrop_chunk) <= limit,
4150             ("PKTDROP chunk too small"));
4151         pktdrp_flags = cp->ch.chunk_flags;
4152         pktdrp_len = ntohs(cp->ch.chunk_length);
4153         KASSERT(limit <= pktdrp_len, ("Inconsistent limit"));
4154         if (pktdrp_flags & SCTP_PACKET_TRUNCATED) {
4155                 if (ntohs(cp->trunc_len) <= pktdrp_len - sizeof(struct sctp_pktdrop_chunk)) {
4156                         /* The peer plays games with us. */
4157                         return;
4158                 }
4159         }
4160         limit -= sizeof(struct sctp_pktdrop_chunk);
4161         offset = 0;
4162         if (offset == limit) {
4163                 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4164                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4165                 }
4166         } else if (offset + sizeof(struct sctphdr) > limit) {
4167                 /* Only a partial SCTP common header. */
4168                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4169                 offset = limit;
4170         } else {
4171                 /* XXX: Check embedded SCTP common header. */
4172                 offset += sizeof(struct sctphdr);
4173         }
4174         /* Now parse through the chunks themselves. */
4175         while (offset < limit) {
4176                 if (offset + sizeof(struct sctp_chunkhdr) > limit) {
4177                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4178                         break;
4179                 }
4180                 chk_hdr = (struct sctp_chunkhdr *)(cp->data + offset);
4181                 desc.chunk_type = chk_hdr->chunk_type;
4182                 /* get amount we need to move */
4183                 chk_len = (uint32_t)ntohs(chk_hdr->chunk_length);
4184                 if (chk_len < sizeof(struct sctp_chunkhdr)) {
4185                         /* Someone is lying... */
4186                         break;
4187                 }
4188                 if (desc.chunk_type == SCTP_DATA) {
4189                         if (stcb->asoc.idata_supported) {
4190                                 /* Some is playing games with us. */
4191                                 break;
4192                         }
4193                         if (chk_len <= sizeof(struct sctp_data_chunk)) {
4194                                 /* Some is playing games with us. */
4195                                 break;
4196                         }
4197                         if (chk_len < sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY) {
4198                                 /*
4199                                  * Not enough data bytes available in the
4200                                  * chunk.
4201                                  */
4202                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4203                                 goto next_chunk;
4204                         }
4205                         if (offset + sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) {
4206                                 /* Not enough data in buffer. */
4207                                 break;
4208                         }
4209                         data_chunk = (struct sctp_data_chunk *)(cp->data + offset);
4210                         memcpy(desc.data_bytes, data_chunk + 1, SCTP_NUM_DB_TO_VERIFY);
4211                         desc.tsn_ifany = data_chunk->dp.tsn;
4212                         if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4213                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4214                         }
4215                 } else if (desc.chunk_type == SCTP_IDATA) {
4216                         if (!stcb->asoc.idata_supported) {
4217                                 /* Some is playing games with us. */
4218                                 break;
4219                         }
4220                         if (chk_len <= sizeof(struct sctp_idata_chunk)) {
4221                                 /* Some is playing games with us. */
4222                                 break;
4223                         }
4224                         if (chk_len < sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY) {
4225                                 /*
4226                                  * Not enough data bytes available in the
4227                                  * chunk.
4228                                  */
4229                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4230                                 goto next_chunk;
4231                         }
4232                         if (offset + sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) {
4233                                 /* Not enough data in buffer. */
4234                                 break;
4235                         }
4236                         idata_chunk = (struct sctp_idata_chunk *)(cp->data + offset);
4237                         memcpy(desc.data_bytes, idata_chunk + 1, SCTP_NUM_DB_TO_VERIFY);
4238                         desc.tsn_ifany = idata_chunk->dp.tsn;
4239                         if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4240                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4241                         }
4242                 } else {
4243                         if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4244                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4245                         }
4246                 }
4247                 if (process_chunk_drop(stcb, &desc, net, pktdrp_flags)) {
4248                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4249                         break;
4250                 }
4251 next_chunk:
4252                 offset += SCTP_SIZE32(chk_len);
4253         }
4254         /* Now update any rwnd --- possibly */
4255         if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4256                 /* From a peer, we get a rwnd report */
4257                 uint32_t a_rwnd;
4258
4259                 SCTP_STAT_INCR(sctps_pdrpfehos);
4260
4261                 bottle_bw = ntohl(cp->bottle_bw);
4262                 on_queue = ntohl(cp->current_onq);
4263                 if (bottle_bw && on_queue) {
4264                         /* a rwnd report is in here */
4265                         if (bottle_bw > on_queue)
4266                                 a_rwnd = bottle_bw - on_queue;
4267                         else
4268                                 a_rwnd = 0;
4269
4270                         if (a_rwnd == 0)
4271                                 stcb->asoc.peers_rwnd = 0;
4272                         else {
4273                                 if (a_rwnd > stcb->asoc.total_flight) {
4274                                         stcb->asoc.peers_rwnd =
4275                                             a_rwnd - stcb->asoc.total_flight;
4276                                 } else {
4277                                         stcb->asoc.peers_rwnd = 0;
4278                                 }
4279                                 if (stcb->asoc.peers_rwnd <
4280                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4281                                         /* SWS sender side engages */
4282                                         stcb->asoc.peers_rwnd = 0;
4283                                 }
4284                         }
4285                 }
4286         } else {
4287                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4288         }
4289
4290         /* now middle boxes in sat networks get a cwnd bump */
4291         if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) &&
4292             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4293             (stcb->asoc.sat_network)) {
4294                 /*
4295                  * This is debatable but for sat networks it makes sense
4296                  * Note if a T3 timer has went off, we will prohibit any
4297                  * changes to cwnd until we exit the t3 loss recovery.
4298                  */
4299                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4300                     net, cp, &bottle_bw, &on_queue);
4301         }
4302 }
4303
4304 /*
4305  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4306  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4307  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4308  * length of the complete packet outputs: - length: modified to remaining
4309  * length after control processing - netp: modified to new sctp_nets after
4310  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4311  * bad packet,...) otherwise return the tcb for this packet
4312  */
4313 #ifdef __GNUC__
4314 __attribute__((noinline))
4315 #endif
4316 static struct sctp_tcb *
4317 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4318     struct sockaddr *src, struct sockaddr *dst,
4319     struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4320     struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4321     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
4322     uint32_t vrf_id, uint16_t port)
4323 {
4324         struct sctp_association *asoc;
4325         struct mbuf *op_err;
4326         char msg[SCTP_DIAG_INFO_LEN];
4327         uint32_t vtag_in;
4328         int num_chunks = 0;     /* number of control chunks processed */
4329         uint32_t chk_length, contiguous;
4330         int ret;
4331         int abort_no_unlock = 0;
4332         int ecne_seen = 0;
4333         int abort_flag;
4334
4335         /*
4336          * How big should this be, and should it be alloc'd? Lets try the
4337          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4338          * until we get into jumbo grams and such..
4339          */
4340         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4341         int got_auth = 0;
4342         uint32_t auth_offset = 0, auth_len = 0;
4343         int auth_skipped = 0;
4344         int asconf_cnt = 0;
4345
4346         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4347             iphlen, *offset, length, (void *)stcb);
4348
4349         if (stcb) {
4350                 SCTP_TCB_LOCK_ASSERT(stcb);
4351         }
4352         /* validate chunk header length... */
4353         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4354                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4355                     ntohs(ch->chunk_length));
4356                 *offset = length;
4357                 return (stcb);
4358         }
4359         /*
4360          * validate the verification tag
4361          */
4362         vtag_in = ntohl(sh->v_tag);
4363
4364         if (ch->chunk_type == SCTP_INITIATION) {
4365                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4366                     ntohs(ch->chunk_length), vtag_in);
4367                 if (vtag_in != 0) {
4368                         /* protocol error- silently discard... */
4369                         SCTP_STAT_INCR(sctps_badvtag);
4370                         if (stcb != NULL) {
4371                                 SCTP_TCB_UNLOCK(stcb);
4372                         }
4373                         return (NULL);
4374                 }
4375         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4376                 /*
4377                  * If there is no stcb, skip the AUTH chunk and process
4378                  * later after a stcb is found (to validate the lookup was
4379                  * valid.
4380                  */
4381                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4382                     (stcb == NULL) &&
4383                     (inp->auth_supported == 1)) {
4384                         /* save this chunk for later processing */
4385                         auth_skipped = 1;
4386                         auth_offset = *offset;
4387                         auth_len = ntohs(ch->chunk_length);
4388
4389                         /* (temporarily) move past this chunk */
4390                         *offset += SCTP_SIZE32(auth_len);
4391                         if (*offset >= length) {
4392                                 /* no more data left in the mbuf chain */
4393                                 *offset = length;
4394                                 return (NULL);
4395                         }
4396                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4397                             sizeof(struct sctp_chunkhdr), chunk_buf);
4398                 }
4399                 if (ch == NULL) {
4400                         /* Help */
4401                         *offset = length;
4402                         return (stcb);
4403                 }
4404                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4405                         goto process_control_chunks;
4406                 }
4407                 /*
4408                  * first check if it's an ASCONF with an unknown src addr we
4409                  * need to look inside to find the association
4410                  */
4411                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4412                         struct sctp_chunkhdr *asconf_ch = ch;
4413                         uint32_t asconf_offset = 0, asconf_len = 0;
4414
4415                         /* inp's refcount may be reduced */
4416                         SCTP_INP_INCR_REF(inp);
4417
4418                         asconf_offset = *offset;
4419                         do {
4420                                 asconf_len = ntohs(asconf_ch->chunk_length);
4421                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4422                                         break;
4423                                 stcb = sctp_findassociation_ep_asconf(m,
4424                                     *offset,
4425                                     dst,
4426                                     sh, &inp, netp, vrf_id);
4427                                 if (stcb != NULL)
4428                                         break;
4429                                 asconf_offset += SCTP_SIZE32(asconf_len);
4430                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4431                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4432                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4433                         if (stcb == NULL) {
4434                                 /*
4435                                  * reduce inp's refcount if not reduced in
4436                                  * sctp_findassociation_ep_asconf().
4437                                  */
4438                                 SCTP_INP_DECR_REF(inp);
4439                         }
4440
4441                         /* now go back and verify any auth chunk to be sure */
4442                         if (auth_skipped && (stcb != NULL)) {
4443                                 struct sctp_auth_chunk *auth;
4444
4445                                 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) {
4446                                         auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, chunk_buf);
4447                                         got_auth = 1;
4448                                         auth_skipped = 0;
4449                                 } else {
4450                                         auth = NULL;
4451                                 }
4452                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4453                                     auth_offset)) {
4454                                         /* auth HMAC failed so dump it */
4455                                         *offset = length;
4456                                         return (stcb);
4457                                 } else {
4458                                         /* remaining chunks are HMAC checked */
4459                                         stcb->asoc.authenticated = 1;
4460                                 }
4461                         }
4462                 }
4463                 if (stcb == NULL) {
4464                         SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4465                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4466                             msg);
4467                         /* no association, so it's out of the blue... */
4468                         sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
4469                             mflowtype, mflowid, inp->fibnum,
4470                             vrf_id, port);
4471                         *offset = length;
4472                         return (NULL);
4473                 }
4474                 asoc = &stcb->asoc;
4475                 /* ABORT and SHUTDOWN can use either v_tag... */
4476                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4477                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4478                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4479                         /* Take the T-bit always into account. */
4480                         if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
4481                             (vtag_in == asoc->my_vtag)) ||
4482                             (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
4483                             (asoc->peer_vtag != htonl(0)) &&
4484                             (vtag_in == asoc->peer_vtag))) {
4485                                 /* this is valid */
4486                         } else {
4487                                 /* drop this packet... */
4488                                 SCTP_STAT_INCR(sctps_badvtag);
4489                                 if (stcb != NULL) {
4490                                         SCTP_TCB_UNLOCK(stcb);
4491                                 }
4492                                 return (NULL);
4493                         }
4494                 } else {
4495                         /* for all other chunks, vtag must match */
4496                         if (vtag_in != asoc->my_vtag) {
4497                                 /* invalid vtag... */
4498                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4499                                     "invalid vtag: %xh, expect %xh\n",
4500                                     vtag_in, asoc->my_vtag);
4501                                 SCTP_STAT_INCR(sctps_badvtag);
4502                                 if (stcb != NULL) {
4503                                         SCTP_TCB_UNLOCK(stcb);
4504                                 }
4505                                 *offset = length;
4506                                 return (NULL);
4507                         }
4508                 }
4509         }                       /* end if !SCTP_COOKIE_ECHO */
4510         /*
4511          * process all control chunks...
4512          */
4513         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4514             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4515             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4516             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
4517                 /* implied cookie-ack.. we must have lost the ack */
4518                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4519                     *netp);
4520         }
4521
4522 process_control_chunks:
4523         while (IS_SCTP_CONTROL(ch)) {
4524                 /* validate chunk length */
4525                 chk_length = ntohs(ch->chunk_length);
4526                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4527                     ch->chunk_type, chk_length);
4528                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4529                 if (chk_length < sizeof(*ch) ||
4530                     (*offset + (int)chk_length) > length) {
4531                         *offset = length;
4532                         return (stcb);
4533                 }
4534                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4535                 /*
4536                  * INIT and INIT-ACK only gets the init ack "header" portion
4537                  * only because we don't have to process the peer's COOKIE.
4538                  * All others get a complete chunk.
4539                  */
4540                 switch (ch->chunk_type) {
4541                 case SCTP_INITIATION:
4542                         contiguous = sizeof(struct sctp_init_chunk);
4543                         break;
4544                 case SCTP_INITIATION_ACK:
4545                         contiguous = sizeof(struct sctp_init_ack_chunk);
4546                         break;
4547                 default:
4548                         contiguous = min(chk_length, sizeof(chunk_buf));
4549                         break;
4550                 }
4551                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4552                     contiguous,
4553                     chunk_buf);
4554                 if (ch == NULL) {
4555                         *offset = length;
4556                         return (stcb);
4557                 }
4558
4559                 num_chunks++;
4560                 /* Save off the last place we got a control from */
4561                 if (stcb != NULL) {
4562                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4563                                 /*
4564                                  * allow last_control to be NULL if
4565                                  * ASCONF... ASCONF processing will find the
4566                                  * right net later
4567                                  */
4568                                 if ((netp != NULL) && (*netp != NULL))
4569                                         stcb->asoc.last_control_chunk_from = *netp;
4570                         }
4571                 }
4572 #ifdef SCTP_AUDITING_ENABLED
4573                 sctp_audit_log(0xB0, ch->chunk_type);
4574 #endif
4575
4576                 /* check to see if this chunk required auth, but isn't */
4577                 if ((stcb != NULL) &&
4578                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4579                     !stcb->asoc.authenticated) {
4580                         /* "silently" ignore */
4581                         SCTP_STAT_INCR(sctps_recvauthmissing);
4582                         goto next_chunk;
4583                 }
4584                 switch (ch->chunk_type) {
4585                 case SCTP_INITIATION:
4586                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4587                         /* The INIT chunk must be the only chunk. */
4588                         if ((num_chunks > 1) ||
4589                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4590                                 /*
4591                                  * RFC 4960bis requires stopping the
4592                                  * processing of the packet.
4593                                  */
4594                                 *offset = length;
4595                                 return (stcb);
4596                         }
4597                         /* Honor our resource limit. */
4598                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4599                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4600                                 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
4601                                     mflowtype, mflowid, inp->fibnum,
4602                                     vrf_id, port);
4603                                 *offset = length;
4604                                 if (stcb != NULL) {
4605                                         SCTP_TCB_UNLOCK(stcb);
4606                                 }
4607                                 return (NULL);
4608                         }
4609                         sctp_handle_init(m, iphlen, *offset, src, dst, sh,
4610                             (struct sctp_init_chunk *)ch, inp,
4611                             stcb, *netp,
4612                             mflowtype, mflowid,
4613                             vrf_id, port);
4614                         *offset = length;
4615                         if (stcb != NULL) {
4616                                 SCTP_TCB_UNLOCK(stcb);
4617                         }
4618                         return (NULL);
4619                         break;
4620                 case SCTP_PAD_CHUNK:
4621                         break;
4622                 case SCTP_INITIATION_ACK:
4623                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n");
4624                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4625                                 /* We are not interested anymore */
4626                                 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) {
4627                                         ;
4628                                 } else {
4629                                         *offset = length;
4630                                         if (stcb != NULL) {
4631                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
4632                                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
4633                                         }
4634                                         return (NULL);
4635                                 }
4636                         }
4637                         /* The INIT-ACK chunk must be the only chunk. */
4638                         if ((num_chunks > 1) ||
4639                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4640                                 *offset = length;
4641                                 return (stcb);
4642                         }
4643                         if ((netp != NULL) && (*netp != NULL)) {
4644                                 ret = sctp_handle_init_ack(m, iphlen, *offset,
4645                                     src, dst, sh,
4646                                     (struct sctp_init_ack_chunk *)ch,
4647                                     stcb, *netp,
4648                                     &abort_no_unlock,
4649                                     mflowtype, mflowid,
4650                                     vrf_id);
4651                         } else {
4652                                 ret = -1;
4653                         }
4654                         *offset = length;
4655                         if (abort_no_unlock) {
4656                                 return (NULL);
4657                         }
4658                         /*
4659                          * Special case, I must call the output routine to
4660                          * get the cookie echoed
4661                          */
4662                         if ((stcb != NULL) && (ret == 0)) {
4663                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4664                         }
4665                         return (stcb);
4666                         break;
4667                 case SCTP_SELECTIVE_ACK:
4668                 case SCTP_NR_SELECTIVE_ACK:
4669                         {
4670                                 int abort_now = 0;
4671                                 uint32_t a_rwnd, cum_ack;
4672                                 uint16_t num_seg, num_nr_seg, num_dup;
4673                                 uint8_t flags;
4674                                 int offset_seg, offset_dup;
4675
4676                                 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n",
4677                                     ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK");
4678                                 SCTP_STAT_INCR(sctps_recvsacks);
4679                                 if (stcb == NULL) {
4680                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n",
4681                                             (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK");
4682                                         break;
4683                                 }
4684                                 if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
4685                                         if (chk_length < sizeof(struct sctp_sack_chunk)) {
4686                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4687                                                 break;
4688                                         }
4689                                 } else {
4690                                         if (stcb->asoc.nrsack_supported == 0) {
4691                                                 goto unknown_chunk;
4692                                         }
4693                                         if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
4694                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n");
4695                                                 break;
4696                                         }
4697                                 }
4698                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4699                                         /*-
4700                                          * If we have sent a shutdown-ack, we will pay no
4701                                          * attention to a sack sent in to us since
4702                                          * we don't care anymore.
4703                                          */
4704                                         break;
4705                                 }
4706                                 flags = ch->chunk_flags;
4707                                 if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
4708                                         struct sctp_sack_chunk *sack;
4709
4710                                         sack = (struct sctp_sack_chunk *)ch;
4711                                         cum_ack = ntohl(sack->sack.cum_tsn_ack);
4712                                         num_seg = ntohs(sack->sack.num_gap_ack_blks);
4713                                         num_nr_seg = 0;
4714                                         num_dup = ntohs(sack->sack.num_dup_tsns);
4715                                         a_rwnd = ntohl(sack->sack.a_rwnd);
4716                                         if (sizeof(struct sctp_sack_chunk) +
4717                                             num_seg * sizeof(struct sctp_gap_ack_block) +
4718                                             num_dup * sizeof(uint32_t) != chk_length) {
4719                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4720                                                 break;
4721                                         }
4722                                         offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4723                                         offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4724                                 } else {
4725                                         struct sctp_nr_sack_chunk *nr_sack;
4726
4727                                         nr_sack = (struct sctp_nr_sack_chunk *)ch;
4728                                         cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
4729                                         num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
4730                                         num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
4731                                         num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
4732                                         a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd);
4733                                         if (sizeof(struct sctp_nr_sack_chunk) +
4734                                             (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
4735                                             num_dup * sizeof(uint32_t) != chk_length) {
4736                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
4737                                                 break;
4738                                         }
4739                                         offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
4740                                         offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block);
4741                                 }
4742                                 SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4743                                     (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK",
4744                                     cum_ack, num_seg, a_rwnd);
4745                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4746                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4747                                     (num_seg == 0) && (num_nr_seg == 0) &&
4748                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4749                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4750                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4751                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
4752                                         /*
4753                                          * We have a SIMPLE sack having no
4754                                          * prior segments and data on sent
4755                                          * queue to be acked. Use the faster
4756                                          * path sack processing. We also
4757                                          * allow window update sacks with no
4758                                          * missing segments to go this way
4759                                          * too.
4760                                          */
4761                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
4762                                             &abort_now, ecne_seen);
4763                                 } else {
4764                                         if ((netp != NULL) && (*netp != NULL)) {
4765                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4766                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
4767                                                     cum_ack, a_rwnd, ecne_seen);
4768                                         }
4769                                 }
4770                                 if (abort_now) {
4771                                         /* ABORT signal from sack processing */
4772                                         *offset = length;
4773                                         return (NULL);
4774                                 }
4775                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4776                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4777                                     (stcb->asoc.stream_queue_cnt == 0)) {
4778                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4779                                 }
4780                                 break;
4781                         }
4782                 case SCTP_HEARTBEAT_REQUEST:
4783                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
4784                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
4785                                 SCTP_STAT_INCR(sctps_recvheartbeat);
4786                                 sctp_send_heartbeat_ack(stcb, m, *offset,
4787                                     chk_length, *netp);
4788                         }
4789                         break;
4790                 case SCTP_HEARTBEAT_ACK:
4791                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n");
4792                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
4793                                 /* Its not ours */
4794                                 break;
4795                         }
4796                         SCTP_STAT_INCR(sctps_recvheartbeatack);
4797                         if ((netp != NULL) && (*netp != NULL)) {
4798                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
4799                                     stcb, *netp);
4800                         }
4801                         break;
4802                 case SCTP_ABORT_ASSOCIATION:
4803                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
4804                             (void *)stcb);
4805                         *offset = length;
4806                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
4807                                 if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) {
4808                                         return (NULL);
4809                                 } else {
4810                                         return (stcb);
4811                                 }
4812                         } else {
4813                                 return (NULL);
4814                         }
4815                         break;
4816                 case SCTP_SHUTDOWN:
4817                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
4818                             (void *)stcb);
4819                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
4820                                 break;
4821                         }
4822                         if ((netp != NULL) && (*netp != NULL)) {
4823                                 abort_flag = 0;
4824                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
4825                                     stcb, *netp, &abort_flag);
4826                                 if (abort_flag) {
4827                                         *offset = length;
4828                                         return (NULL);
4829                                 }
4830                         }
4831                         break;
4832                 case SCTP_SHUTDOWN_ACK:
4833                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb);
4834                         if ((chk_length == sizeof(struct sctp_shutdown_ack_chunk)) &&
4835                             (stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
4836                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
4837                                 *offset = length;
4838                                 return (NULL);
4839                         }
4840                         break;
4841                 case SCTP_OPERATION_ERROR:
4842                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n");
4843                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) &&
4844                             sctp_handle_error(ch, stcb, *netp, contiguous) < 0) {
4845                                 *offset = length;
4846                                 return (NULL);
4847                         }
4848                         break;
4849                 case SCTP_COOKIE_ECHO:
4850                         SCTPDBG(SCTP_DEBUG_INPUT3,
4851                             "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb);
4852                         if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) {
4853                                 ;
4854                         } else {
4855                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4856                                         /* We are not interested anymore */
4857                         abend:
4858                                         if (stcb != NULL) {
4859                                                 SCTP_TCB_UNLOCK(stcb);
4860                                         }
4861                                         *offset = length;
4862                                         return (NULL);
4863                                 }
4864                         }
4865                         /*-
4866                          * First are we accepting? We do this again here
4867                          * since it is possible that a previous endpoint WAS
4868                          * listening responded to a INIT-ACK and then
4869                          * closed. We opened and bound.. and are now no
4870                          * longer listening.
4871                          *
4872                          * XXXGL: notes on checking listen queue length.
4873                          * 1) SCTP_IS_LISTENING() doesn't necessarily mean
4874                          *    SOLISTENING(), because a listening "UDP type"
4875                          *    socket isn't listening in terms of the socket
4876                          *    layer.  It is a normal data flow socket, that
4877                          *    can fork off new connections.  Thus, we should
4878                          *    look into sol_qlen only in case we are !UDP.
4879                          * 2) Checking sol_qlen in general requires locking
4880                          *    the socket, and this code lacks that.
4881                          */
4882                         if ((stcb == NULL) &&
4883                             (!SCTP_IS_LISTENING(inp) ||
4884                             (((inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) == 0) &&
4885                             inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) {
4886                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
4887                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
4888                                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4889                                         sctp_abort_association(inp, stcb, m, iphlen,
4890                                             src, dst, sh, op_err,
4891                                             mflowtype, mflowid,
4892                                             vrf_id, port);
4893                                 }
4894                                 *offset = length;
4895                                 return (NULL);
4896                         } else {
4897                                 struct mbuf *ret_buf;
4898                                 struct sctp_inpcb *linp;
4899                                 struct sctp_tmit_chunk *chk;
4900
4901                                 if (inp->sctp_flags & (SCTP_PCB_FLAGS_SOCKET_GONE |
4902                                     SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
4903                                         goto abend;
4904                                 }
4905
4906                                 if (stcb) {
4907                                         linp = NULL;
4908                                 } else {
4909                                         linp = inp;
4910                                 }
4911
4912                                 if (linp != NULL) {
4913                                         SCTP_ASOC_CREATE_LOCK(linp);
4914                                 }
4915
4916                                 if (netp != NULL) {
4917                                         struct sctp_tcb *locked_stcb;
4918
4919                                         locked_stcb = stcb;
4920                                         ret_buf =
4921                                             sctp_handle_cookie_echo(m, iphlen,
4922                                             *offset,
4923                                             src, dst,
4924                                             sh,
4925                                             (struct sctp_cookie_echo_chunk *)ch,
4926                                             &inp, &stcb, netp,
4927                                             auth_skipped,
4928                                             auth_offset,
4929                                             auth_len,
4930                                             &locked_stcb,
4931                                             mflowtype,
4932                                             mflowid,
4933                                             vrf_id,
4934                                             port);
4935                                         if ((locked_stcb != NULL) && (locked_stcb != stcb)) {
4936                                                 SCTP_TCB_UNLOCK(locked_stcb);
4937                                         }
4938                                         if (stcb != NULL) {
4939                                                 SCTP_TCB_LOCK_ASSERT(stcb);
4940                                         }
4941                                 } else {
4942                                         ret_buf = NULL;
4943                                 }
4944                                 if (linp != NULL) {
4945                                         SCTP_ASOC_CREATE_UNLOCK(linp);
4946                                 }
4947                                 if (ret_buf == NULL) {
4948                                         if (stcb != NULL) {
4949                                                 SCTP_TCB_UNLOCK(stcb);
4950                                         }
4951                                         SCTPDBG(SCTP_DEBUG_INPUT3,
4952                                             "GAK, null buffer\n");
4953                                         *offset = length;
4954                                         return (NULL);
4955                                 }
4956                                 /* if AUTH skipped, see if it verified... */
4957                                 if (auth_skipped) {
4958                                         got_auth = 1;
4959                                         auth_skipped = 0;
4960                                 }
4961                                 /* Restart the timer if we have pending data */
4962                                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
4963                                         if (chk->whoTo != NULL) {
4964                                                 break;
4965                                         }
4966                                 }
4967                                 if (chk != NULL) {
4968                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
4969                                 }
4970                         }
4971                         break;
4972                 case SCTP_COOKIE_ACK:
4973                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb);
4974                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
4975                                 break;
4976                         }
4977                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4978                                 /* We are not interested anymore */
4979                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4980                                         ;
4981                                 } else if (stcb) {
4982                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
4983                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
4984                                         *offset = length;
4985                                         return (NULL);
4986                                 }
4987                         }
4988                         if ((netp != NULL) && (*netp != NULL)) {
4989                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
4990                         }
4991                         break;
4992                 case SCTP_ECN_ECHO:
4993                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n");
4994                         if (stcb == NULL) {
4995                                 break;
4996                         }
4997                         if (stcb->asoc.ecn_supported == 0) {
4998                                 goto unknown_chunk;
4999                         }
5000                         if ((chk_length != sizeof(struct sctp_ecne_chunk)) &&
5001                             (chk_length != sizeof(struct old_sctp_ecne_chunk))) {
5002                                 break;
5003                         }
5004                         sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb);
5005                         ecne_seen = 1;
5006                         break;
5007                 case SCTP_ECN_CWR:
5008                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n");
5009                         if (stcb == NULL) {
5010                                 break;
5011                         }
5012                         if (stcb->asoc.ecn_supported == 0) {
5013                                 goto unknown_chunk;
5014                         }
5015                         if (chk_length != sizeof(struct sctp_cwr_chunk)) {
5016                                 break;
5017                         }
5018                         sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5019                         break;
5020                 case SCTP_SHUTDOWN_COMPLETE:
5021                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb);
5022                         /* must be first and only chunk */
5023                         if ((num_chunks > 1) ||
5024                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5025                                 *offset = length;
5026                                 return (stcb);
5027                         }
5028                         if ((chk_length == sizeof(struct sctp_shutdown_complete_chunk)) &&
5029                             (stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5030                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5031                                     stcb, *netp);
5032                                 *offset = length;
5033                                 return (NULL);
5034                         }
5035                         break;
5036                 case SCTP_ASCONF:
5037                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5038                         if (stcb != NULL) {
5039                                 if (stcb->asoc.asconf_supported == 0) {
5040                                         goto unknown_chunk;
5041                                 }
5042                                 sctp_handle_asconf(m, *offset, src,
5043                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5044                                 asconf_cnt++;
5045                         }
5046                         break;
5047                 case SCTP_ASCONF_ACK:
5048                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n");
5049                         if (stcb == NULL) {
5050                                 break;
5051                         }
5052                         if (stcb->asoc.asconf_supported == 0) {
5053                                 goto unknown_chunk;
5054                         }
5055                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5056                                 break;
5057                         }
5058                         if ((netp != NULL) && (*netp != NULL)) {
5059                                 /* He's alive so give him credit */
5060                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5061                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5062                                             stcb->asoc.overall_error_count,
5063                                             0,
5064                                             SCTP_FROM_SCTP_INPUT,
5065                                             __LINE__);
5066                                 }
5067                                 stcb->asoc.overall_error_count = 0;
5068                                 sctp_handle_asconf_ack(m, *offset,
5069                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5070                                 if (abort_no_unlock)
5071                                         return (NULL);
5072                         }
5073                         break;
5074                 case SCTP_FORWARD_CUM_TSN:
5075                 case SCTP_IFORWARD_CUM_TSN:
5076                         SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n",
5077                             ch->chunk_type == SCTP_FORWARD_CUM_TSN ? "FORWARD_TSN" : "I_FORWARD_TSN");
5078                         if (stcb == NULL) {
5079                                 break;
5080                         }
5081                         if (stcb->asoc.prsctp_supported == 0) {
5082                                 goto unknown_chunk;
5083                         }
5084                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5085                                 break;
5086                         }
5087                         if (((stcb->asoc.idata_supported == 1) && (ch->chunk_type == SCTP_FORWARD_CUM_TSN)) ||
5088                             ((stcb->asoc.idata_supported == 0) && (ch->chunk_type == SCTP_IFORWARD_CUM_TSN))) {
5089                                 if (ch->chunk_type == SCTP_FORWARD_CUM_TSN) {
5090                                         SCTP_SNPRINTF(msg, sizeof(msg), "%s", "FORWARD-TSN chunk received when I-FORWARD-TSN was negotiated");
5091                                 } else {
5092                                         SCTP_SNPRINTF(msg, sizeof(msg), "%s", "I-FORWARD-TSN chunk received when FORWARD-TSN was negotiated");
5093                                 }
5094                                 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
5095                                 sctp_abort_an_association(inp, stcb, op_err, false, SCTP_SO_NOT_LOCKED);
5096                                 *offset = length;
5097                                 return (NULL);
5098                         }
5099                         *fwd_tsn_seen = 1;
5100                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5101                                 /* We are not interested anymore */
5102                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5103                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_31);
5104                                 *offset = length;
5105                                 return (NULL);
5106                         }
5107                         /*
5108                          * For sending a SACK this looks like DATA chunks.
5109                          */
5110                         stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from;
5111                         abort_flag = 0;
5112                         sctp_handle_forward_tsn(stcb,
5113                             (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5114                         if (abort_flag) {
5115                                 *offset = length;
5116                                 return (NULL);
5117                         }
5118                         break;
5119                 case SCTP_STREAM_RESET:
5120                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5121                         if (stcb == NULL) {
5122                                 break;
5123                         }
5124                         if (stcb->asoc.reconfig_supported == 0) {
5125                                 goto unknown_chunk;
5126                         }
5127                         if (chk_length < sizeof(struct sctp_stream_reset_tsn_req)) {
5128                                 break;
5129                         }
5130                         if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5131                                 /* stop processing */
5132                                 *offset = length;
5133                                 return (NULL);
5134                         }
5135                         break;
5136                 case SCTP_PACKET_DROPPED:
5137                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5138                         if (stcb == NULL) {
5139                                 break;
5140                         }
5141                         if (stcb->asoc.pktdrop_supported == 0) {
5142                                 goto unknown_chunk;
5143                         }
5144                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5145                                 break;
5146                         }
5147                         if ((netp != NULL) && (*netp != NULL)) {
5148                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5149                                     stcb, *netp,
5150                                     min(chk_length, contiguous));
5151                         }
5152                         break;
5153                 case SCTP_AUTHENTICATION:
5154                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5155                         if (stcb == NULL) {
5156                                 /* save the first AUTH for later processing */
5157                                 if (auth_skipped == 0) {
5158                                         auth_offset = *offset;
5159                                         auth_len = chk_length;
5160                                         auth_skipped = 1;
5161                                 }
5162                                 /* skip this chunk (temporarily) */
5163                                 break;
5164                         }
5165                         if (stcb->asoc.auth_supported == 0) {
5166                                 goto unknown_chunk;
5167                         }
5168                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5169                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5170                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5171                                 /* Its not ours */
5172                                 *offset = length;
5173                                 return (stcb);
5174                         }
5175                         if (got_auth == 1) {
5176                                 /* skip this chunk... it's already auth'd */
5177                                 break;
5178                         }
5179                         got_auth = 1;
5180                         if (sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, m, *offset)) {
5181                                 /* auth HMAC failed so dump the packet */
5182                                 *offset = length;
5183                                 return (stcb);
5184                         } else {
5185                                 /* remaining chunks are HMAC checked */
5186                                 stcb->asoc.authenticated = 1;
5187                         }
5188                         break;
5189
5190                 default:
5191         unknown_chunk:
5192                         /* it's an unknown chunk! */
5193                         if ((ch->chunk_type & 0x40) &&
5194                             (stcb != NULL) &&
5195                             (SCTP_GET_STATE(stcb) != SCTP_STATE_EMPTY) &&
5196                             (SCTP_GET_STATE(stcb) != SCTP_STATE_INUSE) &&
5197                             (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) {
5198                                 struct sctp_gen_error_cause *cause;
5199                                 int len;
5200
5201                                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause),
5202                                     0, M_NOWAIT, 1, MT_DATA);
5203                                 if (op_err != NULL) {
5204                                         len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset));
5205                                         cause = mtod(op_err, struct sctp_gen_error_cause *);
5206                                         cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5207                                         cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause)));
5208                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5209                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
5210                                         if (SCTP_BUF_NEXT(op_err) != NULL) {
5211 #ifdef SCTP_MBUF_LOGGING
5212                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5213                                                         sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY);
5214                                                 }
5215 #endif
5216                                                 sctp_queue_op_err(stcb, op_err);
5217                                         } else {
5218                                                 sctp_m_freem(op_err);
5219                                         }
5220                                 }
5221                         }
5222                         if ((ch->chunk_type & 0x80) == 0) {
5223                                 /* discard this packet */
5224                                 *offset = length;
5225                                 return (stcb);
5226                         }       /* else skip this bad chunk and continue... */
5227                         break;
5228                 }               /* switch (ch->chunk_type) */
5229
5230 next_chunk:
5231                 /* get the next chunk */
5232                 *offset += SCTP_SIZE32(chk_length);
5233                 if (*offset >= length) {
5234                         /* no more data left in the mbuf chain */
5235                         break;
5236                 }
5237                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5238                     sizeof(struct sctp_chunkhdr), chunk_buf);
5239                 if (ch == NULL) {
5240                         *offset = length;
5241                         return (stcb);
5242                 }
5243         }                       /* while */
5244
5245         if ((asconf_cnt > 0) && (stcb != NULL)) {
5246                 sctp_send_asconf_ack(stcb);
5247         }
5248         return (stcb);
5249 }
5250
5251 /*
5252  * common input chunk processing (v4 and v6)
5253  */
5254 void
5255 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5256     struct sockaddr *src, struct sockaddr *dst,
5257     struct sctphdr *sh, struct sctp_chunkhdr *ch,
5258     uint8_t compute_crc,
5259     uint8_t ecn_bits,
5260     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
5261     uint32_t vrf_id, uint16_t port)
5262 {
5263         uint32_t high_tsn;
5264         int fwd_tsn_seen = 0, data_processed = 0;
5265         struct mbuf *m = *mm, *op_err;
5266         char msg[SCTP_DIAG_INFO_LEN];
5267         int un_sent;
5268         int cnt_ctrl_ready = 0;
5269         struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5270         struct sctp_tcb *stcb = NULL;
5271         struct sctp_nets *net = NULL;
5272
5273         SCTP_STAT_INCR(sctps_recvdatagrams);
5274 #ifdef SCTP_AUDITING_ENABLED
5275         sctp_audit_log(0xE0, 1);
5276         sctp_auditing(0, inp, stcb, net);
5277 #endif
5278         if (compute_crc != 0) {
5279                 uint32_t check, calc_check;
5280
5281                 check = sh->checksum;
5282                 sh->checksum = 0;
5283                 calc_check = sctp_calculate_cksum(m, iphlen);
5284                 sh->checksum = check;
5285                 if (calc_check != check) {
5286                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5287                             calc_check, check, (void *)m, length, iphlen);
5288                         stcb = sctp_findassociation_addr(m, offset, src, dst,
5289                             sh, ch, &inp, &net, vrf_id);
5290 #if defined(INET) || defined(INET6)
5291                         if ((ch->chunk_type != SCTP_INITIATION) &&
5292                             (net != NULL) && (net->port != port)) {
5293                                 if (net->port == 0) {
5294                                         /* UDP encapsulation turned on. */
5295                                         net->mtu -= sizeof(struct udphdr);
5296                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5297                                                 sctp_pathmtu_adjustment(stcb, net->mtu, true);
5298                                         }
5299                                 } else if (port == 0) {
5300                                         /* UDP encapsulation turned off. */
5301                                         net->mtu += sizeof(struct udphdr);
5302                                         /* XXX Update smallest_mtu */
5303                                 }
5304                                 net->port = port;
5305                         }
5306 #endif
5307                         if (net != NULL) {
5308                                 net->flowtype = mflowtype;
5309                                 net->flowid = mflowid;
5310                         }
5311                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5312                         if ((inp != NULL) && (stcb != NULL)) {
5313                                 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5314                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5315                         } else if ((inp != NULL) && (stcb == NULL)) {
5316                                 inp_decr = inp;
5317                         }
5318                         SCTP_STAT_INCR(sctps_badsum);
5319                         SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5320                         goto out;
5321                 }
5322         }
5323         /* Destination port of 0 is illegal, based on RFC4960. */
5324         if (sh->dest_port == 0) {
5325                 SCTP_STAT_INCR(sctps_hdrops);
5326                 goto out;
5327         }
5328         stcb = sctp_findassociation_addr(m, offset, src, dst,
5329             sh, ch, &inp, &net, vrf_id);
5330 #if defined(INET) || defined(INET6)
5331         if ((ch->chunk_type != SCTP_INITIATION) &&
5332             (net != NULL) && (net->port != port)) {
5333                 if (net->port == 0) {
5334                         /* UDP encapsulation turned on. */
5335                         net->mtu -= sizeof(struct udphdr);
5336                         if (stcb->asoc.smallest_mtu > net->mtu) {
5337                                 sctp_pathmtu_adjustment(stcb, net->mtu, true);
5338                         }
5339                 } else if (port == 0) {
5340                         /* UDP encapsulation turned off. */
5341                         net->mtu += sizeof(struct udphdr);
5342                         /* XXX Update smallest_mtu */
5343                 }
5344                 net->port = port;
5345         }
5346 #endif
5347         if (net != NULL) {
5348                 net->flowtype = mflowtype;
5349                 net->flowid = mflowid;
5350         }
5351         if (inp == NULL) {
5352                 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5353                 SCTP_STAT_INCR(sctps_noport);
5354                 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5355                         goto out;
5356                 }
5357                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5358                         SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
5359                         sctp_send_shutdown_complete2(src, dst, sh,
5360                             mflowtype, mflowid, fibnum,
5361                             vrf_id, port);
5362                         goto out;
5363                 }
5364                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5365                         SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
5366                         goto out;
5367                 }
5368                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5369                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5370                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5371                             (ch->chunk_type != SCTP_INIT))) {
5372                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5373                                     "Out of the blue");
5374                                 sctp_send_abort(m, iphlen, src, dst,
5375                                     sh, 0, op_err,
5376                                     mflowtype, mflowid, fibnum,
5377                                     vrf_id, port);
5378                         }
5379                 }
5380                 goto out;
5381         } else if (stcb == NULL) {
5382                 inp_decr = inp;
5383         }
5384         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5385             (void *)m, iphlen, offset, length, (void *)stcb);
5386         if (stcb) {
5387                 /* always clear this before beginning a packet */
5388                 stcb->asoc.authenticated = 0;
5389                 stcb->asoc.seen_a_sack_this_pkt = 0;
5390                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5391                     (void *)stcb, stcb->asoc.state);
5392
5393                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5394                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5395                         /*-
5396                          * If we hit here, we had a ref count
5397                          * up when the assoc was aborted and the
5398                          * timer is clearing out the assoc, we should
5399                          * NOT respond to any packet.. its OOTB.
5400                          */
5401                         SCTP_TCB_UNLOCK(stcb);
5402                         stcb = NULL;
5403                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5404                         SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5405                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5406                             msg);
5407                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5408                             mflowtype, mflowid, inp->fibnum,
5409                             vrf_id, port);
5410                         goto out;
5411                 }
5412         }
5413         if (IS_SCTP_CONTROL(ch)) {
5414                 /* process the control portion of the SCTP packet */
5415                 /* sa_ignore NO_NULL_CHK */
5416                 stcb = sctp_process_control(m, iphlen, &offset, length,
5417                     src, dst, sh, ch,
5418                     inp, stcb, &net, &fwd_tsn_seen,
5419                     mflowtype, mflowid, fibnum,
5420                     vrf_id, port);
5421                 if (stcb) {
5422                         /*
5423                          * This covers us if the cookie-echo was there and
5424                          * it changes our INP.
5425                          */
5426                         inp = stcb->sctp_ep;
5427 #if defined(INET) || defined(INET6)
5428                         if ((ch->chunk_type != SCTP_INITIATION) &&
5429                             (net != NULL) && (net->port != port)) {
5430                                 if (net->port == 0) {
5431                                         /* UDP encapsulation turned on. */
5432                                         net->mtu -= sizeof(struct udphdr);
5433                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5434                                                 sctp_pathmtu_adjustment(stcb, net->mtu, true);
5435                                         }
5436                                 } else if (port == 0) {
5437                                         /* UDP encapsulation turned off. */
5438                                         net->mtu += sizeof(struct udphdr);
5439                                         /* XXX Update smallest_mtu */
5440                                 }
5441                                 net->port = port;
5442                         }
5443 #endif
5444                 }
5445         } else {
5446                 /*
5447                  * no control chunks, so pre-process DATA chunks (these
5448                  * checks are taken care of by control processing)
5449                  */
5450
5451                 /*
5452                  * if DATA only packet, and auth is required, then punt...
5453                  * can't have authenticated without any AUTH (control)
5454                  * chunks
5455                  */
5456                 if ((stcb != NULL) &&
5457                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5458                         /* "silently" ignore */
5459                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5460                         SCTP_STAT_INCR(sctps_recvauthmissing);
5461                         goto out;
5462                 }
5463                 if (stcb == NULL) {
5464                         /* out of the blue DATA chunk */
5465                         SCTP_PROBE5(receive, NULL, NULL, m, NULL, sh);
5466                         SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5467                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5468                             msg);
5469                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5470                             mflowtype, mflowid, fibnum,
5471                             vrf_id, port);
5472                         goto out;
5473                 }
5474                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5475                         /* v_tag mismatch! */
5476                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5477                         SCTP_STAT_INCR(sctps_badvtag);
5478                         goto out;
5479                 }
5480         }
5481
5482         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5483         if (stcb == NULL) {
5484                 /*
5485                  * no valid TCB for this packet, or we found it's a bad
5486                  * packet while processing control, or we're done with this
5487                  * packet (done or skip rest of data), so we drop it...
5488                  */
5489                 goto out;
5490         }
5491
5492         /*
5493          * DATA chunk processing
5494          */
5495         /* plow through the data chunks while length > offset */
5496
5497         /*
5498          * Rest should be DATA only.  Check authentication state if AUTH for
5499          * DATA is required.
5500          */
5501         if ((length > offset) &&
5502             (stcb != NULL) &&
5503             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5504             !stcb->asoc.authenticated) {
5505                 /* "silently" ignore */
5506                 SCTP_STAT_INCR(sctps_recvauthmissing);
5507                 SCTPDBG(SCTP_DEBUG_AUTH1,
5508                     "Data chunk requires AUTH, skipped\n");
5509                 goto trigger_send;
5510         }
5511         if (length > offset) {
5512                 int retval;
5513
5514                 /*
5515                  * First check to make sure our state is correct. We would
5516                  * not get here unless we really did have a tag, so we don't
5517                  * abort if this happens, just dump the chunk silently.
5518                  */
5519                 switch (SCTP_GET_STATE(stcb)) {
5520                 case SCTP_STATE_COOKIE_ECHOED:
5521                         /*
5522                          * we consider data with valid tags in this state
5523                          * shows us the cookie-ack was lost. Imply it was
5524                          * there.
5525                          */
5526                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5527                         break;
5528                 case SCTP_STATE_COOKIE_WAIT:
5529                         /*
5530                          * We consider OOTB any data sent during asoc setup.
5531                          */
5532                         SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5533                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5534                             msg);
5535                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5536                             mflowtype, mflowid, inp->fibnum,
5537                             vrf_id, port);
5538                         goto out;
5539                         /* sa_ignore NOTREACHED */
5540                         break;
5541                 case SCTP_STATE_EMPTY:  /* should not happen */
5542                 case SCTP_STATE_INUSE:  /* should not happen */
5543                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5544                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5545                 default:
5546                         goto out;
5547                         /* sa_ignore NOTREACHED */
5548                         break;
5549                 case SCTP_STATE_OPEN:
5550                 case SCTP_STATE_SHUTDOWN_SENT:
5551                         break;
5552                 }
5553                 /* plow through the data chunks while length > offset */
5554                 retval = sctp_process_data(mm, iphlen, &offset, length,
5555                     inp, stcb, net, &high_tsn);
5556                 if (retval == 2) {
5557                         /*
5558                          * The association aborted, NO UNLOCK needed since
5559                          * the association is destroyed.
5560                          */
5561                         stcb = NULL;
5562                         goto out;
5563                 }
5564                 if (retval == 0) {
5565                         data_processed = 1;
5566                 }
5567                 /*
5568                  * Anything important needs to have been m_copy'ed in
5569                  * process_data
5570                  */
5571         }
5572
5573         /* take care of ecn */
5574         if ((data_processed == 1) &&
5575             (stcb->asoc.ecn_supported == 1) &&
5576             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5577                 /* Yep, we need to add a ECNE */
5578                 sctp_send_ecn_echo(stcb, net, high_tsn);
5579         }
5580
5581         if ((data_processed == 0) && (fwd_tsn_seen)) {
5582                 int was_a_gap;
5583                 uint32_t highest_tsn;
5584
5585                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
5586                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
5587                 } else {
5588                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
5589                 }
5590                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
5591                 stcb->asoc.send_sack = 1;
5592                 sctp_sack_check(stcb, was_a_gap);
5593         } else if (fwd_tsn_seen) {
5594                 stcb->asoc.send_sack = 1;
5595         }
5596         /* trigger send of any chunks in queue... */
5597 trigger_send:
5598 #ifdef SCTP_AUDITING_ENABLED
5599         sctp_audit_log(0xE0, 2);
5600         sctp_auditing(1, inp, stcb, net);
5601 #endif
5602         SCTPDBG(SCTP_DEBUG_INPUT1,
5603             "Check for chunk output prw:%d tqe:%d tf=%d\n",
5604             stcb->asoc.peers_rwnd,
5605             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
5606             stcb->asoc.total_flight);
5607         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
5608         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
5609                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
5610         }
5611         if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) ||
5612             cnt_ctrl_ready ||
5613             stcb->asoc.trigger_reset ||
5614             ((un_sent > 0) &&
5615             (stcb->asoc.peers_rwnd > 0 || stcb->asoc.total_flight == 0))) {
5616                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
5617                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5618                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
5619         }
5620 #ifdef SCTP_AUDITING_ENABLED
5621         sctp_audit_log(0xE0, 3);
5622         sctp_auditing(2, inp, stcb, net);
5623 #endif
5624 out:
5625         if (stcb != NULL) {
5626                 SCTP_TCB_UNLOCK(stcb);
5627         }
5628         if (inp_decr != NULL) {
5629                 /* reduce ref-count */
5630                 SCTP_INP_WLOCK(inp_decr);
5631                 SCTP_INP_DECR_REF(inp_decr);
5632                 SCTP_INP_WUNLOCK(inp_decr);
5633         }
5634         return;
5635 }
5636
5637 #ifdef INET
5638 void
5639 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
5640 {
5641         struct mbuf *m;
5642         int iphlen;
5643         uint32_t vrf_id = 0;
5644         uint8_t ecn_bits;
5645         struct sockaddr_in src, dst;
5646         struct ip *ip;
5647         struct sctphdr *sh;
5648         struct sctp_chunkhdr *ch;
5649         int length, offset;
5650         uint8_t compute_crc;
5651         uint32_t mflowid;
5652         uint8_t mflowtype;
5653         uint16_t fibnum;
5654
5655         iphlen = off;
5656         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
5657                 SCTP_RELEASE_PKT(i_pak);
5658                 return;
5659         }
5660         m = SCTP_HEADER_TO_CHAIN(i_pak);
5661 #ifdef SCTP_MBUF_LOGGING
5662         /* Log in any input mbufs */
5663         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5664                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
5665         }
5666 #endif
5667 #ifdef SCTP_PACKET_LOGGING
5668         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
5669                 sctp_packet_log(m);
5670         }
5671 #endif
5672         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
5673             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
5674             m->m_pkthdr.len,
5675             if_name(m->m_pkthdr.rcvif),
5676             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
5677         mflowid = m->m_pkthdr.flowid;
5678         mflowtype = M_HASHTYPE_GET(m);
5679         fibnum = M_GETFIB(m);
5680         SCTP_STAT_INCR(sctps_recvpackets);
5681         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
5682         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
5683         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5684         if (SCTP_BUF_LEN(m) < offset) {
5685                 if ((m = m_pullup(m, offset)) == NULL) {
5686                         SCTP_STAT_INCR(sctps_hdrops);
5687                         return;
5688                 }
5689         }
5690         ip = mtod(m, struct ip *);
5691         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
5692         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
5693         offset -= sizeof(struct sctp_chunkhdr);
5694         memset(&src, 0, sizeof(struct sockaddr_in));
5695         src.sin_family = AF_INET;
5696         src.sin_len = sizeof(struct sockaddr_in);
5697         src.sin_port = sh->src_port;
5698         src.sin_addr = ip->ip_src;
5699         memset(&dst, 0, sizeof(struct sockaddr_in));
5700         dst.sin_family = AF_INET;
5701         dst.sin_len = sizeof(struct sockaddr_in);
5702         dst.sin_port = sh->dest_port;
5703         dst.sin_addr = ip->ip_dst;
5704         length = ntohs(ip->ip_len);
5705         /* Validate mbuf chain length with IP payload length. */
5706         if (SCTP_HEADER_LEN(m) != length) {
5707                 SCTPDBG(SCTP_DEBUG_INPUT1,
5708                     "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
5709                 SCTP_STAT_INCR(sctps_hdrops);
5710                 goto out;
5711         }
5712         /* SCTP does not allow broadcasts or multicasts */
5713         if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
5714                 goto out;
5715         }
5716         if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
5717                 goto out;
5718         }
5719         ecn_bits = ip->ip_tos;
5720         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
5721                 SCTP_STAT_INCR(sctps_recvhwcrc);
5722                 compute_crc = 0;
5723         } else {
5724                 SCTP_STAT_INCR(sctps_recvswcrc);
5725                 compute_crc = 1;
5726         }
5727         sctp_common_input_processing(&m, iphlen, offset, length,
5728             (struct sockaddr *)&src,
5729             (struct sockaddr *)&dst,
5730             sh, ch,
5731             compute_crc,
5732             ecn_bits,
5733             mflowtype, mflowid, fibnum,
5734             vrf_id, port);
5735 out:
5736         if (m) {
5737                 sctp_m_freem(m);
5738         }
5739         return;
5740 }
5741
5742 #if defined(SCTP_MCORE_INPUT) && defined(SMP)
5743 extern int *sctp_cpuarry;
5744 #endif
5745
5746 int
5747 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED)
5748 {
5749         struct mbuf *m;
5750         int off;
5751
5752         m = *mp;
5753         off = *offp;
5754 #if defined(SCTP_MCORE_INPUT) && defined(SMP)
5755         if (mp_ncpus > 1) {
5756                 struct ip *ip;
5757                 struct sctphdr *sh;
5758                 int offset;
5759                 int cpu_to_use;
5760                 uint32_t flowid, tag;
5761
5762                 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
5763                         flowid = m->m_pkthdr.flowid;
5764                 } else {
5765                         /*
5766                          * No flow id built by lower layers fix it so we
5767                          * create one.
5768                          */
5769                         offset = off + sizeof(struct sctphdr);
5770                         if (SCTP_BUF_LEN(m) < offset) {
5771                                 if ((m = m_pullup(m, offset)) == NULL) {
5772                                         SCTP_STAT_INCR(sctps_hdrops);
5773                                         return (IPPROTO_DONE);
5774                                 }
5775                         }
5776                         ip = mtod(m, struct ip *);
5777                         sh = (struct sctphdr *)((caddr_t)ip + off);
5778                         tag = htonl(sh->v_tag);
5779                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
5780                         m->m_pkthdr.flowid = flowid;
5781                         M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH);
5782                 }
5783                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
5784                 sctp_queue_to_mcore(m, off, cpu_to_use);
5785                 return (IPPROTO_DONE);
5786         }
5787 #endif
5788         sctp_input_with_port(m, off, 0);
5789         return (IPPROTO_DONE);
5790 }
5791 #endif