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