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
 512         /*
 513          * Cancel the INIT timer, We do this first before queueing the
 514          * cookie. We always cancel at the primary to assume that we are
 515          * canceling the timer started by the INIT which always goes to the
 516          * primary.
 517          */
 518         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
 519             asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 520
 521         /* calculate the RTO */
 522         if (asoc->overall_error_count == 0) {
 523                 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered,
 524                     SCTP_RTT_FROM_NON_DATA);
 525         }
 526         stcb->asoc.overall_error_count = 0;
 527         net->error_count = 0;
 528         retval = sctp_send_cookie_echo(m, offset, initack_limit, stcb, net);
 529         return (retval);
 530 }
 531
 532 static void
 533 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
 534     struct sctp_tcb *stcb, struct sctp_nets *net)
 535 {
 536         union sctp_sockstore store;
 537         struct sctp_nets *r_net, *f_net;
 538         struct timeval tv;
 539         int req_prim = 0;
 540         uint16_t old_error_counter;
 541
 542         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
 543                 /* Invalid length */
 544                 return;
 545         }
 546
 547         memset(&store, 0, sizeof(store));
 548         switch (cp->heartbeat.hb_info.addr_family) {
 549 #ifdef INET
 550         case AF_INET:
 551                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
 552                         store.sin.sin_family = cp->heartbeat.hb_info.addr_family;
 553                         store.sin.sin_len = cp->heartbeat.hb_info.addr_len;
 554                         store.sin.sin_port = stcb->rport;
 555                         memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address,
 556                             sizeof(store.sin.sin_addr));
 557                 } else {
 558                         return;
 559                 }
 560                 break;
 561 #endif
 562 #ifdef INET6
 563         case AF_INET6:
 564                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
 565                         store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family;
 566                         store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len;
 567                         store.sin6.sin6_port = stcb->rport;
 568                         memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr));
 569                 } else {
 570                         return;
 571                 }
 572                 break;
 573 #endif
 574         default:
 575                 return;
 576         }
 577         r_net = sctp_findnet(stcb, &store.sa);
 578         if (r_net == NULL) {
 579                 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
 580                 return;
 581         }
 582         if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 583             (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
 584             (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
 585                 /*
 586                  * If the its a HB and it's random value is correct when can
 587                  * confirm the destination.
 588                  */
 589                 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 590                 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
 591                         stcb->asoc.primary_destination = r_net;
 592                         r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
 593                         f_net = TAILQ_FIRST(&stcb->asoc.nets);
 594                         if (f_net != r_net) {
 595                                 /*
 596                                  * first one on the list is NOT the primary
 597                                  * sctp_cmpaddr() is much more efficient if
 598                                  * the primary is the first on the list,
 599                                  * make it so.
 600                                  */
 601                                 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
 602                                 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
 603                         }
 604                         req_prim = 1;
 605                 }
 606                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 607                     stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 608                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb,
 609                     r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
 610                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 611         }
 612         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 613                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 614                     stcb->asoc.overall_error_count,
 615                     0,
 616                     SCTP_FROM_SCTP_INPUT,
 617                     __LINE__);
 618         }
 619         stcb->asoc.overall_error_count = 0;
 620         old_error_counter = r_net->error_count;
 621         r_net->error_count = 0;
 622         r_net->hb_responded = 1;
 623         tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
 624         tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
 625         /* Now lets do a RTO with this */
 626         sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv,
 627             SCTP_RTT_FROM_NON_DATA);
 628         if ((r_net->dest_state & SCTP_ADDR_REACHABLE) == 0) {
 629                 r_net->dest_state |= SCTP_ADDR_REACHABLE;
 630                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
 631                     0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 632         }
 633         if (r_net->dest_state & SCTP_ADDR_PF) {
 634                 r_net->dest_state &= ~SCTP_ADDR_PF;
 635                 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
 636         }
 637         if (old_error_counter > 0) {
 638                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
 639                     stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5);
 640                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 641         }
 642         if (r_net == stcb->asoc.primary_destination) {
 643                 if (stcb->asoc.alternate) {
 644                         /* release the alternate, primary is good */
 645                         sctp_free_remote_addr(stcb->asoc.alternate);
 646                         stcb->asoc.alternate = NULL;
 647                 }
 648         }
 649         /* Mobility adaptation */
 650         if (req_prim) {
 651                 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
 652                     SCTP_MOBILITY_BASE) ||
 653                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 654                     SCTP_MOBILITY_FASTHANDOFF)) &&
 655                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 656                     SCTP_MOBILITY_PRIM_DELETED)) {
 657                         sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED,
 658                             stcb->sctp_ep, stcb, NULL,
 659                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 660                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 661                             SCTP_MOBILITY_FASTHANDOFF)) {
 662                                 sctp_assoc_immediate_retrans(stcb,
 663                                     stcb->asoc.primary_destination);
 664                         }
 665                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 666                             SCTP_MOBILITY_BASE)) {
 667                                 sctp_move_chunks_from_net(stcb,
 668                                     stcb->asoc.deleted_primary);
 669                         }
 670                         sctp_delete_prim_timer(stcb->sctp_ep, stcb);
 671                 }
 672         }
 673 }
 674
 675 static int
 676 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
 677 {
 678         /*
 679          * Return 0 means we want you to proceed with the abort non-zero
 680          * means no abort processing.
 681          */
 682         uint32_t new_vtag;
 683         struct sctpasochead *head;
 684
 685         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
 686             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
 687                 atomic_add_int(&stcb->asoc.refcnt, 1);
 688                 SCTP_TCB_UNLOCK(stcb);
 689                 SCTP_INP_INFO_WLOCK();
 690                 SCTP_TCB_LOCK(stcb);
 691                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 692         } else {
 693                 return (0);
 694         }
 695         new_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 696         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) {
 697                 /* generate a new vtag and send init */
 698                 LIST_REMOVE(stcb, sctp_asocs);
 699                 stcb->asoc.my_vtag = new_vtag;
 700                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 701                 /*
 702                  * put it in the bucket in the vtag hash of assoc's for the
 703                  * system
 704                  */
 705                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 706                 SCTP_INP_INFO_WUNLOCK();
 707                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 708                 return (1);
 709         } else {
 710                 /*
 711                  * treat like a case where the cookie expired i.e.: - dump
 712                  * current cookie. - generate a new vtag. - resend init.
 713                  */
 714                 /* generate a new vtag and send init */
 715                 LIST_REMOVE(stcb, sctp_asocs);
 716                 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
 717                 sctp_stop_all_cookie_timers(stcb);
 718                 sctp_toss_old_cookies(stcb, &stcb->asoc);
 719                 stcb->asoc.my_vtag = new_vtag;
 720                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 721                 /*
 722                  * put it in the bucket in the vtag hash of assoc's for the
 723                  * system
 724                  */
 725                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 726                 SCTP_INP_INFO_WUNLOCK();
 727                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 728                 return (1);
 729         }
 730         return (0);
 731 }
 732
 733 static int
 734 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
 735     struct sctp_nets *net)
 736 {
 737         /*
 738          * return 0 means we want you to proceed with the abort non-zero
 739          * means no abort processing
 740          */
 741         if (stcb->asoc.auth_supported == 0) {
 742                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
 743                 return (0);
 744         }
 745         sctp_asconf_send_nat_state_update(stcb, net);
 746         return (1);
 747 }
 748
 749 /* Returns 1 if the stcb was aborted, 0 otherwise */
 750 static int
 751 sctp_handle_abort(struct sctp_abort_chunk *abort,
 752     struct sctp_tcb *stcb, struct sctp_nets *net)
 753 {
 754         uint16_t len;
 755         uint16_t error;
 756
 757         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
 758         if (stcb == NULL)
 759                 return (0);
 760
 761         len = ntohs(abort->ch.chunk_length);
 762         if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) {
 763                 /*
 764                  * Need to check the cause codes for our two magic nat
 765                  * aborts which don't kill the assoc necessarily.
 766                  */
 767                 struct sctp_error_cause *cause;
 768
 769                 cause = (struct sctp_error_cause *)(abort + 1);
 770                 error = ntohs(cause->code);
 771                 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) {
 772                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ABORT flags:%x\n",
 773                             abort->ch.chunk_flags);
 774                         if (sctp_handle_nat_colliding_state(stcb)) {
 775                                 return (0);
 776                         }
 777                 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) {
 778                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ABORT flags:%x\n",
 779                             abort->ch.chunk_flags);
 780                         if (sctp_handle_nat_missing_state(stcb, net)) {
 781                                 return (0);
 782                         }
 783                 }
 784         } else {
 785                 error = 0;
 786         }
 787         /* stop any receive timers */
 788         sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL,
 789             SCTP_FROM_SCTP_INPUT + SCTP_LOC_7);
 790         /* notify user of the abort and clean up... */
 791         sctp_abort_notification(stcb, true, false, error, abort, SCTP_SO_NOT_LOCKED);
 792         /* free the tcb */
 793         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
 794         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
 795             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 796                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 797         }
 798 #ifdef SCTP_ASOCLOG_OF_TSNS
 799         sctp_print_out_track_log(stcb);
 800 #endif
 801         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 802             SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
 803         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
 804         return (1);
 805 }
 806
 807 static void
 808 sctp_start_net_timers(struct sctp_tcb *stcb)
 809 {
 810         uint32_t cnt_hb_sent;
 811         struct sctp_nets *net;
 812
 813         cnt_hb_sent = 0;
 814         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 815                 /*
 816                  * For each network start: 1) A pmtu timer. 2) A HB timer 3)
 817                  * If the dest in unconfirmed send a hb as well if under
 818                  * max_hb_burst have been sent.
 819                  */
 820                 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
 821                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
 822                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
 823                     (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
 824                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 825                         cnt_hb_sent++;
 826                 }
 827         }
 828         if (cnt_hb_sent) {
 829                 sctp_chunk_output(stcb->sctp_ep, stcb,
 830                     SCTP_OUTPUT_FROM_COOKIE_ACK,
 831                     SCTP_SO_NOT_LOCKED);
 832         }
 833 }
 834
 835 static void
 836 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
 837     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
 838 {
 839         struct sctp_association *asoc;
 840         int some_on_streamwheel;
 841         int old_state;
 842
 843         SCTPDBG(SCTP_DEBUG_INPUT2,
 844             "sctp_handle_shutdown: handling SHUTDOWN\n");
 845         if (stcb == NULL)
 846                 return;
 847         asoc = &stcb->asoc;
 848         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
 849             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
 850                 return;
 851         }
 852         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
 853                 /* Shutdown NOT the expected size */
 854                 return;
 855         }
 856         old_state = SCTP_GET_STATE(stcb);
 857         sctp_update_acked(stcb, cp, abort_flag);
 858         if (*abort_flag) {
 859                 return;
 860         }
 861         if (asoc->control_pdapi) {
 862                 /*
 863                  * With a normal shutdown we assume the end of last record.
 864                  */
 865                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 866                 if (asoc->control_pdapi->on_strm_q) {
 867                         struct sctp_stream_in *strm;
 868
 869                         strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream];
 870                         if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) {
 871                                 /* Unordered */
 872                                 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm);
 873                                 asoc->control_pdapi->on_strm_q = 0;
 874                         } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) {
 875                                 /* Ordered */
 876                                 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm);
 877                                 asoc->control_pdapi->on_strm_q = 0;
 878 #ifdef INVARIANTS
 879                         } else {
 880                                 panic("Unknown state on ctrl:%p on_strm_q:%d",
 881                                     asoc->control_pdapi,
 882                                     asoc->control_pdapi->on_strm_q);
 883 #endif
 884                         }
 885                 }
 886                 asoc->control_pdapi->end_added = 1;
 887                 asoc->control_pdapi->pdapi_aborted = 1;
 888                 asoc->control_pdapi = NULL;
 889                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 890                 if (stcb->sctp_socket) {
 891                         sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 892                 }
 893         }
 894         /* goto SHUTDOWN_RECEIVED state to block new requests */
 895         if (stcb->sctp_socket) {
 896                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 897                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
 898                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) {
 899                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_RECEIVED);
 900                         /*
 901                          * notify upper layer that peer has initiated a
 902                          * shutdown
 903                          */
 904                         sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 905
 906                         /* reset time */
 907                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
 908                 }
 909         }
 910         if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) {
 911                 /*
 912                  * stop the shutdown timer, since we WILL move to
 913                  * SHUTDOWN-ACK-SENT.
 914                  */
 915                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
 916                     net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
 917         }
 918         /* Now is there unsent data on a stream somewhere? */
 919         some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
 920
 921         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 922             !TAILQ_EMPTY(&asoc->sent_queue) ||
 923             some_on_streamwheel) {
 924                 /* By returning we will push more data out */
 925                 return;
 926         } else {
 927                 /* no outstanding data to send, so move on... */
 928                 /* send SHUTDOWN-ACK */
 929                 /* move to SHUTDOWN-ACK-SENT state */
 930                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
 931                     (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 932                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 933                 }
 934                 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
 935                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_ACK_SENT);
 936                         sctp_stop_timers_for_shutdown(stcb);
 937                         sctp_send_shutdown_ack(stcb, net);
 938                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
 939                             stcb->sctp_ep, stcb, net);
 940                 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) {
 941                         sctp_send_shutdown_ack(stcb, net);
 942                 }
 943         }
 944 }
 945
 946 static void
 947 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
 948     struct sctp_tcb *stcb,
 949     struct sctp_nets *net)
 950 {
 951         struct sctp_association *asoc;
 952
 953         SCTPDBG(SCTP_DEBUG_INPUT2,
 954             "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
 955         if (stcb == NULL)
 956                 return;
 957
 958         asoc = &stcb->asoc;
 959         /* process according to association state */
 960         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
 961             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
 962                 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
 963                 sctp_send_shutdown_complete(stcb, net, 1);
 964                 SCTP_TCB_UNLOCK(stcb);
 965                 return;
 966         }
 967         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
 968             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 969                 /* unexpected SHUTDOWN-ACK... so ignore... */
 970                 SCTP_TCB_UNLOCK(stcb);
 971                 return;
 972         }
 973         if (asoc->control_pdapi) {
 974                 /*
 975                  * With a normal shutdown we assume the end of last record.
 976                  */
 977                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 978                 asoc->control_pdapi->end_added = 1;
 979                 asoc->control_pdapi->pdapi_aborted = 1;
 980                 asoc->control_pdapi = NULL;
 981                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 982                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 983         }
 984 #ifdef INVARIANTS
 985         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 986             !TAILQ_EMPTY(&asoc->sent_queue) ||
 987             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
 988                 panic("Queues are not empty when handling SHUTDOWN-ACK");
 989         }
 990 #endif
 991         /* stop the timer */
 992         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net,
 993             SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
 994         /* send SHUTDOWN-COMPLETE */
 995         sctp_send_shutdown_complete(stcb, net, 0);
 996         /* notify upper layer protocol */
 997         if (stcb->sctp_socket) {
 998                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
 999                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
1000                         SCTP_SB_CLEAR(stcb->sctp_socket->so_snd);
1001                 }
1002                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
1003         }
1004         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1005         /* free the TCB but first save off the ep */
1006         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1007             SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1008 }
1009
1010 static void
1011 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type)
1012 {
1013         switch (chunk_type) {
1014         case SCTP_ASCONF_ACK:
1015         case SCTP_ASCONF:
1016                 sctp_asconf_cleanup(stcb);
1017                 break;
1018         case SCTP_IFORWARD_CUM_TSN:
1019         case SCTP_FORWARD_CUM_TSN:
1020                 stcb->asoc.prsctp_supported = 0;
1021                 break;
1022         default:
1023                 SCTPDBG(SCTP_DEBUG_INPUT2,
1024                     "Peer does not support chunk type %d (0x%x).\n",
1025                     chunk_type, chunk_type);
1026                 break;
1027         }
1028 }
1029
1030 /*
1031  * Skip past the param header and then we will find the param that caused the
1032  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1033  * these will turn of specific features.
1034  * XXX: Is this the right thing to do?
1035  */
1036 static void
1037 sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type)
1038 {
1039         switch (parameter_type) {
1040                 /* pr-sctp draft */
1041         case SCTP_PRSCTP_SUPPORTED:
1042                 stcb->asoc.prsctp_supported = 0;
1043                 break;
1044         case SCTP_SUPPORTED_CHUNK_EXT:
1045                 break;
1046                 /* draft-ietf-tsvwg-addip-sctp */
1047         case SCTP_HAS_NAT_SUPPORT:
1048                 stcb->asoc.peer_supports_nat = 0;
1049                 break;
1050         case SCTP_ADD_IP_ADDRESS:
1051         case SCTP_DEL_IP_ADDRESS:
1052         case SCTP_SET_PRIM_ADDR:
1053                 stcb->asoc.asconf_supported = 0;
1054                 break;
1055         case SCTP_SUCCESS_REPORT:
1056         case SCTP_ERROR_CAUSE_IND:
1057                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1058                 SCTPDBG(SCTP_DEBUG_INPUT2,
1059                     "Turning off ASCONF to this strange peer\n");
1060                 stcb->asoc.asconf_supported = 0;
1061                 break;
1062         default:
1063                 SCTPDBG(SCTP_DEBUG_INPUT2,
1064                     "Peer does not support param type %d (0x%x)??\n",
1065                     parameter_type, parameter_type);
1066                 break;
1067         }
1068 }
1069
1070 static int
1071 sctp_handle_error(struct sctp_chunkhdr *ch,
1072     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
1073 {
1074         struct sctp_error_cause *cause;
1075         struct sctp_association *asoc;
1076         uint32_t remaining_length, adjust;
1077         uint16_t code, cause_code, cause_length;
1078
1079         /* parse through all of the errors and process */
1080         asoc = &stcb->asoc;
1081         cause = (struct sctp_error_cause *)((caddr_t)ch +
1082             sizeof(struct sctp_chunkhdr));
1083         remaining_length = ntohs(ch->chunk_length);
1084         if (remaining_length > limit) {
1085                 remaining_length = limit;
1086         }
1087         if (remaining_length >= sizeof(struct sctp_chunkhdr)) {
1088                 remaining_length -= sizeof(struct sctp_chunkhdr);
1089         } else {
1090                 remaining_length = 0;
1091         }
1092         code = 0;
1093         while (remaining_length >= sizeof(struct sctp_error_cause)) {
1094                 /* Process an Error Cause */
1095                 cause_code = ntohs(cause->code);
1096                 cause_length = ntohs(cause->length);
1097                 if ((cause_length > remaining_length) || (cause_length == 0)) {
1098                         /* Invalid cause length, possibly due to truncation. */
1099                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n",
1100                             remaining_length, cause_length);
1101                         return (0);
1102                 }
1103                 if (code == 0) {
1104                         /* report the first error cause */
1105                         code = cause_code;
1106                 }
1107                 switch (cause_code) {
1108                 case SCTP_CAUSE_INVALID_STREAM:
1109                 case SCTP_CAUSE_MISSING_PARAM:
1110                 case SCTP_CAUSE_INVALID_PARAM:
1111                 case SCTP_CAUSE_NO_USER_DATA:
1112                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n",
1113                             cause_code);
1114                         break;
1115                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1116                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ERROR flags: %x\n",
1117                             ch->chunk_flags);
1118                         if (sctp_handle_nat_colliding_state(stcb)) {
1119                                 return (0);
1120                         }
1121                         break;
1122                 case SCTP_CAUSE_NAT_MISSING_STATE:
1123                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ERROR flags: %x\n",
1124                             ch->chunk_flags);
1125                         if (sctp_handle_nat_missing_state(stcb, net)) {
1126                                 return (0);
1127                         }
1128                         break;
1129                 case SCTP_CAUSE_STALE_COOKIE:
1130                         /*
1131                          * We only act if we have echoed a cookie and are
1132                          * waiting.
1133                          */
1134                         if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) &&
1135                             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
1136                                 struct timeval now;
1137                                 struct sctp_error_stale_cookie *stale_cookie;
1138                                 uint64_t stale_time;
1139
1140                                 asoc->stale_cookie_count++;
1141                                 if (asoc->stale_cookie_count > asoc->max_init_times) {
1142                                         sctp_abort_notification(stcb, false, true, 0, NULL, SCTP_SO_NOT_LOCKED);
1143                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1144                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1145                                         return (-1);
1146                                 }
1147                                 stale_cookie = (struct sctp_error_stale_cookie *)cause;
1148                                 stale_time = ntohl(stale_cookie->stale_time);
1149                                 if (stale_time == 0) {
1150                                         /* Use an RTT as an approximation. */
1151                                         (void)SCTP_GETTIME_TIMEVAL(&now);
1152                                         timevalsub(&now, &asoc->time_entered);
1153                                         stale_time = (uint64_t)1000000 * (uint64_t)now.tv_sec + (uint64_t)now.tv_usec;
1154                                         if (stale_time == 0) {
1155                                                 stale_time = 1;
1156                                         }
1157                                 }
1158                                 /*
1159                                  * stale_time is in usec, convert it to
1160                                  * msec. Round upwards, to ensure that it is
1161                                  * non-zero.
1162                                  */
1163                                 stale_time = (stale_time + 999) / 1000;
1164                                 /* Double it, to be more robust on RTX. */
1165                                 stale_time = 2 * stale_time;
1166                                 asoc->cookie_preserve_req = (uint32_t)stale_time;
1167                                 if (asoc->overall_error_count == 0) {
1168                                         sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered,
1169                                             SCTP_RTT_FROM_NON_DATA);
1170                                 }
1171                                 asoc->overall_error_count = 0;
1172                                 /* Blast back to INIT state */
1173                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
1174                                 sctp_stop_all_cookie_timers(stcb);
1175                                 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
1176                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
1177                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1178                         }
1179                         break;
1180                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1181                         /*
1182                          * Nothing we can do here, we don't do hostname
1183                          * addresses so if the peer does not like my IPv6
1184                          * (or IPv4 for that matter) it does not matter. If
1185                          * they don't support that type of address, they can
1186                          * NOT possibly get that packet type... i.e. with no
1187                          * IPv6 you can't receive a IPv6 packet. so we can
1188                          * safely ignore this one. If we ever added support
1189                          * for HOSTNAME Addresses, then we would need to do
1190                          * something here.
1191                          */
1192                         break;
1193                 case SCTP_CAUSE_UNRECOG_CHUNK:
1194                         if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) {
1195                                 struct sctp_error_unrecognized_chunk *unrec_chunk;
1196
1197                                 unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause;
1198                                 sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type);
1199                         }
1200                         break;
1201                 case SCTP_CAUSE_UNRECOG_PARAM:
1202                         /* XXX: We only consider the first parameter */
1203                         if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) {
1204                                 struct sctp_paramhdr *unrec_parameter;
1205
1206                                 unrec_parameter = (struct sctp_paramhdr *)(cause + 1);
1207                                 sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type));
1208                         }
1209                         break;
1210                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1211                         /*
1212                          * We ignore this since the timer will drive out a
1213                          * new cookie anyway and there timer will drive us
1214                          * to send a SHUTDOWN_COMPLETE. We can't send one
1215                          * here since we don't have their tag.
1216                          */
1217                         break;
1218                 case SCTP_CAUSE_DELETING_LAST_ADDR:
1219                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1220                 case SCTP_CAUSE_DELETING_SRC_ADDR:
1221                         /*
1222                          * We should NOT get these here, but in a
1223                          * ASCONF-ACK.
1224                          */
1225                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n",
1226                             cause_code);
1227                         break;
1228                 case SCTP_CAUSE_OUT_OF_RESC:
1229                         /*
1230                          * And what, pray tell do we do with the fact that
1231                          * the peer is out of resources? Not really sure we
1232                          * could do anything but abort. I suspect this
1233                          * should have came WITH an abort instead of in a
1234                          * OP-ERROR.
1235                          */
1236                         break;
1237                 default:
1238                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n",
1239                             cause_code);
1240                         break;
1241                 }
1242                 adjust = SCTP_SIZE32(cause_length);
1243                 if (remaining_length >= adjust) {
1244                         remaining_length -= adjust;
1245                 } else {
1246                         remaining_length = 0;
1247                 }
1248                 cause = (struct sctp_error_cause *)((caddr_t)cause + adjust);
1249         }
1250         sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED);
1251         return (0);
1252 }
1253
1254 static int
1255 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1256     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
1257     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1258     struct sctp_nets *net, int *abort_no_unlock,
1259     uint8_t mflowtype, uint32_t mflowid,
1260     uint32_t vrf_id)
1261 {
1262         struct sctp_init_ack *init_ack;
1263         struct mbuf *op_err;
1264
1265         SCTPDBG(SCTP_DEBUG_INPUT2,
1266             "sctp_handle_init_ack: handling INIT-ACK\n");
1267
1268         if (stcb == NULL) {
1269                 SCTPDBG(SCTP_DEBUG_INPUT2,
1270                     "sctp_handle_init_ack: TCB is null\n");
1271                 return (-1);
1272         }
1273         /* Only process the INIT-ACK chunk in COOKIE WAIT state. */
1274         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) {
1275                 init_ack = &cp->init;
1276                 /* Validate parameters. */
1277                 if ((ntohl(init_ack->initiate_tag) == 0) ||
1278                     (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) ||
1279                     (ntohs(init_ack->num_inbound_streams) == 0) ||
1280                     (ntohs(init_ack->num_outbound_streams) == 0)) {
1281                         /* One of the mandatory parameters is illegal. */
1282                         op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1283                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1284                             src, dst, sh, op_err,
1285                             mflowtype, mflowid,
1286                             vrf_id, net->port);
1287                         *abort_no_unlock = 1;
1288                         return (-1);
1289                 }
1290                 if (stcb->asoc.primary_destination->dest_state &
1291                     SCTP_ADDR_UNCONFIRMED) {
1292                         /*
1293                          * The primary is where we sent the INIT, we can
1294                          * always consider it confirmed when the INIT-ACK is
1295                          * returned. Do this before we load addresses
1296                          * though.
1297                          */
1298                         stcb->asoc.primary_destination->dest_state &=
1299                             ~SCTP_ADDR_UNCONFIRMED;
1300                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1301                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1302                 }
1303                 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
1304                     net, abort_no_unlock,
1305                     mflowtype, mflowid,
1306                     vrf_id) < 0) {
1307                         /* error in parsing parameters */
1308                         return (-1);
1309                 }
1310                 /* Update our state. */
1311                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1312                 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_ECHOED);
1313
1314                 /* Reset the RTO calculation. */
1315                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1316                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1317                             stcb->asoc.overall_error_count,
1318                             0,
1319                             SCTP_FROM_SCTP_INPUT,
1320                             __LINE__);
1321                 }
1322                 stcb->asoc.overall_error_count = 0;
1323                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1324                 /*
1325                  * Collapse the init timer back in case of a exponential
1326                  * backoff.
1327                  */
1328                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1329                     stcb, net);
1330                 /*
1331                  * The output routine at the end of the inbound data
1332                  * processing will cause the cookie to be sent.
1333                  */
1334                 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1335                 return (0);
1336         } else {
1337                 return (-1);
1338         }
1339 }
1340
1341 static struct sctp_tcb *
1342 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1343     struct sockaddr *src, struct sockaddr *dst,
1344     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1345     struct sctp_inpcb *inp, struct sctp_nets **netp,
1346     struct sockaddr *init_src, int *notification,
1347     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1348     uint8_t mflowtype, uint32_t mflowid,
1349     uint32_t vrf_id, uint16_t port);
1350
1351 /*
1352  * handle a state cookie for an existing association m: input packet mbuf
1353  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1354  * "split" mbuf and the cookie signature does not exist offset: offset into
1355  * mbuf to the cookie-echo chunk
1356  */
1357 static struct sctp_tcb *
1358 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1359     struct sockaddr *src, struct sockaddr *dst,
1360     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1361     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1362     struct sockaddr *init_src, int *notification,
1363     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1364     uint8_t mflowtype, uint32_t mflowid,
1365     uint32_t vrf_id, uint16_t port)
1366 {
1367         struct sctp_association *asoc;
1368         struct sctp_init_chunk *init_cp, init_buf;
1369         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1370         struct sctp_asconf_addr *aparam, *naparam;
1371         struct sctp_asconf_ack *aack, *naack;
1372         struct sctp_tmit_chunk *chk, *nchk;
1373         struct sctp_stream_reset_list *strrst, *nstrrst;
1374         struct sctp_queued_to_read *sq, *nsq;
1375         struct sctp_nets *net;
1376         struct mbuf *op_err;
1377         int init_offset, initack_offset, i;
1378         int retval;
1379         int spec_flag = 0;
1380         uint32_t how_indx;
1381 #if defined(SCTP_DETAILED_STR_STATS)
1382         int j;
1383 #endif
1384
1385         net = *netp;
1386         /* I know that the TCB is non-NULL from the caller */
1387         asoc = &stcb->asoc;
1388         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1389                 if (asoc->cookie_how[how_indx] == 0)
1390                         break;
1391         }
1392         if (how_indx < sizeof(asoc->cookie_how)) {
1393                 asoc->cookie_how[how_indx] = 1;
1394         }
1395         if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1396                 /* SHUTDOWN came in after sending INIT-ACK */
1397                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1398                 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, "");
1399                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
1400                     mflowtype, mflowid, inp->fibnum,
1401                     vrf_id, net->port);
1402                 if (how_indx < sizeof(asoc->cookie_how))
1403                         asoc->cookie_how[how_indx] = 2;
1404                 SCTP_TCB_UNLOCK(stcb);
1405                 return (NULL);
1406         }
1407         /*
1408          * find and validate the INIT chunk in the cookie (peer's info) the
1409          * INIT should start after the cookie-echo header struct (chunk
1410          * header, state cookie header struct)
1411          */
1412         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1413
1414         init_cp = (struct sctp_init_chunk *)
1415             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1416             (uint8_t *)&init_buf);
1417         if (init_cp == NULL) {
1418                 /* could not pull a INIT chunk in cookie */
1419                 SCTP_TCB_UNLOCK(stcb);
1420                 return (NULL);
1421         }
1422         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1423                 SCTP_TCB_UNLOCK(stcb);
1424                 return (NULL);
1425         }
1426         /*
1427          * find and validate the INIT-ACK chunk in the cookie (my info) the
1428          * INIT-ACK follows the INIT chunk
1429          */
1430         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1431         initack_cp = (struct sctp_init_ack_chunk *)
1432             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1433             (uint8_t *)&initack_buf);
1434         if (initack_cp == NULL) {
1435                 /* could not pull INIT-ACK chunk in cookie */
1436                 SCTP_TCB_UNLOCK(stcb);
1437                 return (NULL);
1438         }
1439         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1440                 SCTP_TCB_UNLOCK(stcb);
1441                 return (NULL);
1442         }
1443         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1444             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1445                 /*
1446                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
1447                  * to get into the OPEN state
1448                  */
1449                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1450                         /*-
1451                          * Opps, this means that we somehow generated two vtag's
1452                          * the same. I.e. we did:
1453                          *  Us               Peer
1454                          *   <---INIT(tag=a)------
1455                          *   ----INIT-ACK(tag=t)-->
1456                          *   ----INIT(tag=t)------> *1
1457                          *   <---INIT-ACK(tag=a)---
1458                          *   <----CE(tag=t)------------- *2
1459                          *
1460                          * At point *1 we should be generating a different
1461                          * tag t'. Which means we would throw away the CE and send
1462                          * ours instead. Basically this is case C (throw away side).
1463                          */
1464                         if (how_indx < sizeof(asoc->cookie_how))
1465                                 asoc->cookie_how[how_indx] = 17;
1466                         SCTP_TCB_UNLOCK(stcb);
1467                         return (NULL);
1468                 }
1469                 switch (SCTP_GET_STATE(stcb)) {
1470                 case SCTP_STATE_COOKIE_WAIT:
1471                 case SCTP_STATE_COOKIE_ECHOED:
1472                         /*
1473                          * INIT was sent but got a COOKIE_ECHO with the
1474                          * correct tags... just accept it...but we must
1475                          * process the init so that we can make sure we have
1476                          * the right seq no's.
1477                          */
1478                         /* First we must process the INIT !! */
1479                         if (sctp_process_init(init_cp, stcb) < 0) {
1480                                 if (how_indx < sizeof(asoc->cookie_how))
1481                                         asoc->cookie_how[how_indx] = 3;
1482                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
1483                                 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n");
1484                                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1485                                     src, dst, sh, op_err,
1486                                     mflowtype, mflowid,
1487                                     vrf_id, net->port);
1488                                 return (NULL);
1489                         }
1490                         /* we have already processed the INIT so no problem */
1491                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp,
1492                             stcb, net,
1493                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1494                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp,
1495                             stcb, net,
1496                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1497                         /* update current state */
1498                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)
1499                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1500                         else
1501                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1502
1503                         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1504                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1505                         sctp_stop_all_cookie_timers(stcb);
1506                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1507                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1508                             (!SCTP_IS_LISTENING(inp))) {
1509                                 /*
1510                                  * Here is where collision would go if we
1511                                  * did a connect() and instead got a
1512                                  * init/init-ack/cookie done before the
1513                                  * init-ack came back..
1514                                  */
1515                                 sctp_pcb_add_flags(stcb->sctp_ep, SCTP_PCB_FLAGS_CONNECTED);
1516                                 soisconnected(stcb->sctp_socket);
1517                         }
1518                         /* notify upper layer */
1519                         *notification = SCTP_NOTIFY_ASSOC_UP;
1520                         net->hb_responded = 1;
1521                         if (stcb->asoc.sctp_autoclose_ticks &&
1522                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1523                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1524                                     inp, stcb, NULL);
1525                         }
1526                         break;
1527                 default:
1528                         /*
1529                          * we're in the OPEN state (or beyond), so peer must
1530                          * have simply lost the COOKIE-ACK
1531                          */
1532                         break;
1533                 }               /* end switch */
1534                 sctp_stop_all_cookie_timers(stcb);
1535                 if ((retval = sctp_load_addresses_from_init(stcb, m,
1536                     init_offset + sizeof(struct sctp_init_chunk),
1537                     initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) {
1538                         if (how_indx < sizeof(asoc->cookie_how))
1539                                 asoc->cookie_how[how_indx] = 4;
1540                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
1541                             "Problem with address parameters");
1542                         SCTPDBG(SCTP_DEBUG_INPUT1,
1543                             "Load addresses from INIT causes an abort %d\n",
1544                             retval);
1545                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1546                             src, dst, sh, op_err,
1547                             mflowtype, mflowid,
1548                             vrf_id, net->port);
1549                         return (NULL);
1550                 }
1551                 /* respond with a COOKIE-ACK */
1552                 sctp_toss_old_cookies(stcb, asoc);
1553                 sctp_send_cookie_ack(stcb);
1554                 if (how_indx < sizeof(asoc->cookie_how))
1555                         asoc->cookie_how[how_indx] = 5;
1556                 return (stcb);
1557         }
1558
1559         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1560             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1561             cookie->tie_tag_my_vtag == 0 &&
1562             cookie->tie_tag_peer_vtag == 0) {
1563                 /*
1564                  * case C in Section 5.2.4 Table 2: XMOO silently discard
1565                  */
1566                 if (how_indx < sizeof(asoc->cookie_how))
1567                         asoc->cookie_how[how_indx] = 6;
1568                 SCTP_TCB_UNLOCK(stcb);
1569                 return (NULL);
1570         }
1571         /*
1572          * If nat support, and the below and stcb is established, send back
1573          * a ABORT(colliding state) if we are established.
1574          */
1575         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) &&
1576             (asoc->peer_supports_nat) &&
1577             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1578             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1579             (asoc->peer_vtag == 0)))) {
1580                 /*
1581                  * Special case - Peer's support nat. We may have two init's
1582                  * that we gave out the same tag on since one was not
1583                  * established.. i.e. we get INIT from host-1 behind the nat
1584                  * and we respond tag-a, we get a INIT from host-2 behind
1585                  * the nat and we get tag-a again. Then we bring up host-1
1586                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1587                  * Now we have colliding state. We must send an abort here
1588                  * with colliding state indication.
1589                  */
1590                 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, "");
1591                 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
1592                     mflowtype, mflowid, inp->fibnum,
1593                     vrf_id, port);
1594                 SCTP_TCB_UNLOCK(stcb);
1595                 return (NULL);
1596         }
1597         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1598             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1599             (asoc->peer_vtag == 0))) {
1600                 /*
1601                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1602                  * should be ok, re-accept peer info
1603                  */
1604                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1605                         /*
1606                          * Extension of case C. If we hit this, then the
1607                          * random number generator returned the same vtag
1608                          * when we first sent our INIT-ACK and when we later
1609                          * sent our INIT. The side with the seq numbers that
1610                          * are different will be the one that normally would
1611                          * have hit case C. This in effect "extends" our
1612                          * vtags in this collision case to be 64 bits. The
1613                          * same collision could occur aka you get both vtag
1614                          * and seq number the same twice in a row.. but is
1615                          * much less likely. If it did happen then we would
1616                          * proceed through and bring up the assoc.. we may
1617                          * end up with the wrong stream setup however..
1618                          * which would be bad.. but there is no way to
1619                          * tell.. until we send on a stream that does not
1620                          * exist :-)
1621                          */
1622                         if (how_indx < sizeof(asoc->cookie_how))
1623                                 asoc->cookie_how[how_indx] = 7;
1624
1625                         SCTP_TCB_UNLOCK(stcb);
1626                         return (NULL);
1627                 }
1628                 if (how_indx < sizeof(asoc->cookie_how))
1629                         asoc->cookie_how[how_indx] = 8;
1630                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1631                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1632                 sctp_stop_all_cookie_timers(stcb);
1633                 /*
1634                  * since we did not send a HB make sure we don't double
1635                  * things
1636                  */
1637                 net->hb_responded = 1;
1638                 if (stcb->asoc.sctp_autoclose_ticks &&
1639                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1640                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1641                             NULL);
1642                 }
1643                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1644                 if (asoc->pre_open_streams < asoc->streamoutcnt) {
1645                         asoc->pre_open_streams = asoc->streamoutcnt;
1646                 }
1647
1648                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1649                         /*
1650                          * Ok the peer probably discarded our data (if we
1651                          * echoed a cookie+data). So anything on the
1652                          * sent_queue should be marked for retransmit, we
1653                          * may not get something to kick us so it COULD
1654                          * still take a timeout to move these.. but it can't
1655                          * hurt to mark them.
1656                          */
1657
1658                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1659                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1660                                         chk->sent = SCTP_DATAGRAM_RESEND;
1661                                         sctp_flight_size_decrease(chk);
1662                                         sctp_total_flight_decrease(stcb, chk);
1663                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1664                                         spec_flag++;
1665                                 }
1666                         }
1667                 }
1668                 /* process the INIT info (peer's info) */
1669                 if (sctp_process_init(init_cp, stcb) < 0) {
1670                         if (how_indx < sizeof(asoc->cookie_how))
1671                                 asoc->cookie_how[how_indx] = 9;
1672                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
1673                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n");
1674                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1675                             src, dst, sh, op_err,
1676                             mflowtype, mflowid,
1677                             vrf_id, net->port);
1678                         return (NULL);
1679                 }
1680                 if ((retval = sctp_load_addresses_from_init(stcb, m,
1681                     init_offset + sizeof(struct sctp_init_chunk),
1682                     initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) {
1683                         if (how_indx < sizeof(asoc->cookie_how))
1684                                 asoc->cookie_how[how_indx] = 10;
1685                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
1686                             "Problem with address parameters");
1687                         SCTPDBG(SCTP_DEBUG_INPUT1,
1688                             "Load addresses from INIT causes an abort %d\n",
1689                             retval);
1690                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1691                             src, dst, sh, op_err,
1692                             mflowtype, mflowid,
1693                             vrf_id, net->port);
1694                         return (NULL);
1695                 }
1696                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
1697                     (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
1698                         *notification = SCTP_NOTIFY_ASSOC_UP;
1699
1700                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1701                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1702                             (!SCTP_IS_LISTENING(inp))) {
1703                                 sctp_pcb_add_flags(stcb->sctp_ep, SCTP_PCB_FLAGS_CONNECTED);
1704                                 soisconnected(stcb->sctp_socket);
1705                         }
1706                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)
1707                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1708                         else
1709                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1710                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1711                 } else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
1712                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1713                 } else {
1714                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1715                 }
1716                 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1717                 sctp_stop_all_cookie_timers(stcb);
1718                 sctp_toss_old_cookies(stcb, asoc);
1719                 sctp_send_cookie_ack(stcb);
1720                 if (spec_flag) {
1721                         /*
1722                          * only if we have retrans set do we do this. What
1723                          * this call does is get only the COOKIE-ACK out and
1724                          * then when we return the normal call to
1725                          * sctp_chunk_output will get the retrans out behind
1726                          * this.
1727                          */
1728                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1729                 }
1730                 if (how_indx < sizeof(asoc->cookie_how))
1731                         asoc->cookie_how[how_indx] = 11;
1732
1733                 return (stcb);
1734         }
1735         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1736             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1737             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1738             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1739             cookie->tie_tag_peer_vtag != 0) {
1740                 struct sctpasochead *head;
1741
1742                 if (asoc->peer_supports_nat) {
1743                         struct sctp_tcb *local_stcb;
1744
1745                         /*
1746                          * This is a gross gross hack. Just call the
1747                          * cookie_new code since we are allowing a duplicate
1748                          * association. I hope this works...
1749                          */
1750                         local_stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst,
1751                             sh, cookie, cookie_len,
1752                             inp, netp, init_src, notification,
1753                             auth_skipped, auth_offset, auth_len,
1754                             mflowtype, mflowid,
1755                             vrf_id, port);
1756                         if (local_stcb == NULL) {
1757                                 SCTP_TCB_UNLOCK(stcb);
1758                         }
1759                         return (local_stcb);
1760                 }
1761                 /*
1762                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1763                  */
1764                 /* temp code */
1765                 if (how_indx < sizeof(asoc->cookie_how))
1766                         asoc->cookie_how[how_indx] = 12;
1767                 sctp_stop_association_timers(stcb, false);
1768                 /* notify upper layer */
1769                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1770                 atomic_add_int(&stcb->asoc.refcnt, 1);
1771                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) &&
1772                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1773                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) {
1774                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1775                 }
1776                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
1777                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1778                 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
1779                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1780                 }
1781                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1782                         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1783
1784                 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
1785                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1786                         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1787                 }
1788                 if (asoc->pre_open_streams < asoc->streamoutcnt) {
1789                         asoc->pre_open_streams = asoc->streamoutcnt;
1790                 }
1791                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1792                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1793                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1794                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1795                 asoc->str_reset_seq_in = asoc->init_seq_number;
1796                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1797                 asoc->send_sack = 1;
1798                 asoc->data_pkts_seen = 0;
1799                 asoc->last_data_chunk_from = NULL;
1800                 asoc->last_control_chunk_from = NULL;
1801                 asoc->last_net_cmt_send_started = NULL;
1802                 if (asoc->mapping_array) {
1803                         memset(asoc->mapping_array, 0,
1804                             asoc->mapping_array_size);
1805                 }
1806                 if (asoc->nr_mapping_array) {
1807                         memset(asoc->nr_mapping_array, 0,
1808                             asoc->mapping_array_size);
1809                 }
1810                 SCTP_TCB_UNLOCK(stcb);
1811                 SCTP_INP_INFO_WLOCK();
1812                 SCTP_INP_WLOCK(stcb->sctp_ep);
1813                 SCTP_TCB_LOCK(stcb);
1814                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1815                 /* send up all the data */
1816                 sctp_report_all_outbound(stcb, 0, SCTP_SO_LOCKED);
1817                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1818                         stcb->asoc.strmout[i].chunks_on_queues = 0;
1819 #if defined(SCTP_DETAILED_STR_STATS)
1820                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
1821                                 asoc->strmout[i].abandoned_sent[j] = 0;
1822                                 asoc->strmout[i].abandoned_unsent[j] = 0;
1823                         }
1824 #else
1825                         asoc->strmout[i].abandoned_sent[0] = 0;
1826                         asoc->strmout[i].abandoned_unsent[0] = 0;
1827 #endif
1828                         stcb->asoc.strmout[i].next_mid_ordered = 0;
1829                         stcb->asoc.strmout[i].next_mid_unordered = 0;
1830                         stcb->asoc.strmout[i].sid = i;
1831                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
1832                 }
1833                 TAILQ_FOREACH_SAFE(strrst, &asoc->resetHead, next_resp, nstrrst) {
1834                         TAILQ_REMOVE(&asoc->resetHead, strrst, next_resp);
1835                         SCTP_FREE(strrst, SCTP_M_STRESET);
1836                 }
1837                 TAILQ_FOREACH_SAFE(sq, &asoc->pending_reply_queue, next, nsq) {
1838                         TAILQ_REMOVE(&asoc->pending_reply_queue, sq, next);
1839                         if (sq->data) {
1840                                 sctp_m_freem(sq->data);
1841                                 sq->data = NULL;
1842                         }
1843                         sctp_free_remote_addr(sq->whoFrom);
1844                         sq->whoFrom = NULL;
1845                         sq->stcb = NULL;
1846                         sctp_free_a_readq(stcb, sq);
1847                 }
1848                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
1849                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
1850                         if (chk->data) {
1851                                 sctp_m_freem(chk->data);
1852                                 chk->data = NULL;
1853                         }
1854                         if (chk->holds_key_ref)
1855                                 sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED);
1856                         sctp_free_remote_addr(chk->whoTo);
1857                         SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk);
1858                         SCTP_DECR_CHK_COUNT();
1859                 }
1860                 asoc->ctrl_queue_cnt = 0;
1861                 asoc->str_reset = NULL;
1862                 asoc->stream_reset_outstanding = 0;
1863                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
1864                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
1865                         if (chk->data) {
1866                                 sctp_m_freem(chk->data);
1867                                 chk->data = NULL;
1868                         }
1869                         if (chk->holds_key_ref)
1870                                 sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED);
1871                         sctp_free_remote_addr(chk->whoTo);
1872                         SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk);
1873                         SCTP_DECR_CHK_COUNT();
1874                 }
1875                 TAILQ_FOREACH_SAFE(aparam, &asoc->asconf_queue, next, naparam) {
1876                         TAILQ_REMOVE(&asoc->asconf_queue, aparam, next);
1877                         SCTP_FREE(aparam, SCTP_M_ASC_ADDR);
1878                 }
1879                 TAILQ_FOREACH_SAFE(aack, &asoc->asconf_ack_sent, next, naack) {
1880                         TAILQ_REMOVE(&asoc->asconf_ack_sent, aack, next);
1881                         if (aack->data != NULL) {
1882                                 sctp_m_freem(aack->data);
1883                         }
1884                         SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_asconf_ack), aack);
1885                 }
1886                 asoc->rcv_edmid = cookie->rcv_edmid;
1887
1888                 /* process the INIT-ACK info (my info) */
1889                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1890                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1891
1892                 /* pull from vtag hash */
1893                 LIST_REMOVE(stcb, sctp_asocs);
1894                 /* re-insert to new vtag position */
1895                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1896                     SCTP_BASE_INFO(hashasocmark))];
1897                 /*
1898                  * put it in the bucket in the vtag hash of assoc's for the
1899                  * system
1900                  */
1901                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
1902
1903                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
1904                 SCTP_INP_INFO_WUNLOCK();
1905                 asoc->total_flight = 0;
1906                 asoc->total_flight_count = 0;
1907                 /* process the INIT info (peer's info) */
1908                 if (sctp_process_init(init_cp, stcb) < 0) {
1909                         if (how_indx < sizeof(asoc->cookie_how))
1910                                 asoc->cookie_how[how_indx] = 13;
1911                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
1912                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n");
1913                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1914                             src, dst, sh, op_err,
1915                             mflowtype, mflowid,
1916                             vrf_id, net->port);
1917                         return (NULL);
1918                 }
1919                 /*
1920                  * since we did not send a HB make sure we don't double
1921                  * things
1922                  */
1923                 net->hb_responded = 1;
1924
1925                 if ((retval = sctp_load_addresses_from_init(stcb, m,
1926                     init_offset + sizeof(struct sctp_init_chunk),
1927                     initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) {
1928                         if (how_indx < sizeof(asoc->cookie_how))
1929                                 asoc->cookie_how[how_indx] = 14;
1930                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
1931                             "Problem with address parameters");
1932                         SCTPDBG(SCTP_DEBUG_INPUT1,
1933                             "Load addresses from INIT causes an abort %d\n",
1934                             retval);
1935                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1936                             src, dst, sh, op_err,
1937                             mflowtype, mflowid,
1938                             vrf_id, net->port);
1939                         return (NULL);
1940                 }
1941                 /* respond with a COOKIE-ACK */
1942                 sctp_send_cookie_ack(stcb);
1943                 if (how_indx < sizeof(asoc->cookie_how))
1944                         asoc->cookie_how[how_indx] = 15;
1945                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE) &&
1946                     (asoc->sctp_autoclose_ticks > 0)) {
1947                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
1948                 }
1949                 return (stcb);
1950         }
1951         if (how_indx < sizeof(asoc->cookie_how))
1952                 asoc->cookie_how[how_indx] = 16;
1953         /* all other cases... */
1954         SCTP_TCB_UNLOCK(stcb);
1955         return (NULL);
1956 }
1957
1958 /*
1959  * handle a state cookie for a new association m: input packet mbuf chain--
1960  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
1961  * and the cookie signature does not exist offset: offset into mbuf to the
1962  * cookie-echo chunk length: length of the cookie chunk to: where the init
1963  * was from returns a new TCB
1964  */
1965 static struct sctp_tcb *
1966 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1967     struct sockaddr *src, struct sockaddr *dst,
1968     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1969     struct sctp_inpcb *inp, struct sctp_nets **netp,
1970     struct sockaddr *init_src, int *notification,
1971     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1972     uint8_t mflowtype, uint32_t mflowid,
1973     uint32_t vrf_id, uint16_t port)
1974 {
1975         struct sctp_tcb *stcb;
1976         struct sctp_init_chunk *init_cp, init_buf;
1977         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1978         union sctp_sockstore store;
1979         struct sctp_association *asoc;
1980         int init_offset, initack_offset, initack_limit;
1981         int error = 0;
1982         uint8_t auth_chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
1983
1984         /*
1985          * find and validate the INIT chunk in the cookie (peer's info) the
1986          * INIT should start after the cookie-echo header struct (chunk
1987          * header, state cookie header struct)
1988          */
1989         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
1990         init_cp = (struct sctp_init_chunk *)
1991             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1992             (uint8_t *)&init_buf);
1993         if (init_cp == NULL) {
1994                 /* could not pull a INIT chunk in cookie */
1995                 SCTPDBG(SCTP_DEBUG_INPUT1,
1996                     "process_cookie_new: could not pull INIT chunk hdr\n");
1997                 return (NULL);
1998         }
1999         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
2000                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
2001                 return (NULL);
2002         }
2003         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
2004         /*
2005          * find and validate the INIT-ACK chunk in the cookie (my info) the
2006          * INIT-ACK follows the INIT chunk
2007          */
2008         initack_cp = (struct sctp_init_ack_chunk *)
2009             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
2010             (uint8_t *)&initack_buf);
2011         if (initack_cp == NULL) {
2012                 /* could not pull INIT-ACK chunk in cookie */
2013                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2014                 return (NULL);
2015         }
2016         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2017                 return (NULL);
2018         }
2019         /*
2020          * NOTE: We can't use the INIT_ACK's chk_length to determine the
2021          * "initack_limit" value.  This is because the chk_length field
2022          * includes the length of the cookie, but the cookie is omitted when
2023          * the INIT and INIT_ACK are tacked onto the cookie...
2024          */
2025         initack_limit = offset + cookie_len;
2026
2027         /*
2028          * now that we know the INIT/INIT-ACK are in place, create a new TCB
2029          * and populate
2030          */
2031
2032         /*
2033          * Here we do a trick, we set in NULL for the proc/thread argument.
2034          * We do this since in effect we only use the p argument when the
2035          * socket is unbound and we must do an implicit bind. Since we are
2036          * getting a cookie, we cannot be unbound.
2037          */
2038         stcb = sctp_aloc_assoc(inp, init_src, &error,
2039             ntohl(initack_cp->init.initiate_tag),
2040             ntohl(initack_cp->init.initial_tsn), vrf_id,
2041             ntohs(initack_cp->init.num_outbound_streams),
2042             port,
2043             (struct thread *)NULL,
2044             SCTP_DONT_INITIALIZE_AUTH_PARAMS);
2045         if (stcb == NULL) {
2046                 struct mbuf *op_err;
2047
2048                 /* memory problem? */
2049                 SCTPDBG(SCTP_DEBUG_INPUT1,
2050                     "process_cookie_new: no room for another TCB!\n");
2051                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2052                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2053                     src, dst, sh, op_err,
2054                     mflowtype, mflowid,
2055                     vrf_id, port);
2056                 return (NULL);
2057         }
2058         asoc = &stcb->asoc;
2059         /* get scope variables out of cookie */
2060         asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
2061         asoc->scope.site_scope = cookie->site_scope;
2062         asoc->scope.local_scope = cookie->local_scope;
2063         asoc->scope.loopback_scope = cookie->loopback_scope;
2064
2065         if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2066             (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2067                 struct mbuf *op_err;
2068
2069                 /*
2070                  * Houston we have a problem. The EP changed while the
2071                  * cookie was in flight. Only recourse is to abort the
2072                  * association.
2073                  */
2074                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2075                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2076                     src, dst, sh, op_err,
2077                     mflowtype, mflowid,
2078                     vrf_id, port);
2079                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2080                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2081                 return (NULL);
2082         }
2083         asoc->rcv_edmid = cookie->rcv_edmid;
2084         /* process the INIT-ACK info (my info) */
2085         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2086
2087         /* process the INIT info (peer's info) */
2088         if (sctp_process_init(init_cp, stcb) < 0) {
2089                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2090                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2091                 return (NULL);
2092         }
2093         /* load all addresses */
2094         if (sctp_load_addresses_from_init(stcb, m,
2095             init_offset + sizeof(struct sctp_init_chunk),
2096             initack_offset, src, dst, init_src, port) < 0) {
2097                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2098                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2099                 return (NULL);
2100         }
2101         /*
2102          * verify any preceding AUTH chunk that was skipped
2103          */
2104         /* pull the local authentication parameters from the cookie/init-ack */
2105         sctp_auth_get_cookie_params(stcb, m,
2106             initack_offset + sizeof(struct sctp_init_ack_chunk),
2107             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2108         if (auth_skipped) {
2109                 struct sctp_auth_chunk *auth;
2110
2111                 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) {
2112                         auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2113                 } else {
2114                         auth = NULL;
2115                 }
2116                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2117                         /* auth HMAC failed, dump the assoc and packet */
2118                         SCTPDBG(SCTP_DEBUG_AUTH1,
2119                             "COOKIE-ECHO: AUTH failed\n");
2120                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2121                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_21);
2122                         return (NULL);
2123                 } else {
2124                         /* remaining chunks checked... good to go */
2125                         stcb->asoc.authenticated = 1;
2126                 }
2127         }
2128
2129         /*
2130          * if we're doing ASCONFs, check to see if we have any new local
2131          * addresses that need to get added to the peer (eg. addresses
2132          * changed while cookie echo in flight).  This needs to be done
2133          * after we go to the OPEN state to do the correct asconf
2134          * processing. else, make sure we have the correct addresses in our
2135          * lists
2136          */
2137
2138         /* warning, we re-use sin, sin6, sa_store here! */
2139         /* pull in local_address (our "from" address) */
2140         switch (cookie->laddr_type) {
2141 #ifdef INET
2142         case SCTP_IPV4_ADDRESS:
2143                 /* source addr is IPv4 */
2144                 memset(&store.sin, 0, sizeof(struct sockaddr_in));
2145                 store.sin.sin_family = AF_INET;
2146                 store.sin.sin_len = sizeof(struct sockaddr_in);
2147                 store.sin.sin_addr.s_addr = cookie->laddress[0];
2148                 break;
2149 #endif
2150 #ifdef INET6
2151         case SCTP_IPV6_ADDRESS:
2152                 /* source addr is IPv6 */
2153                 memset(&store.sin6, 0, sizeof(struct sockaddr_in6));
2154                 store.sin6.sin6_family = AF_INET6;
2155                 store.sin6.sin6_len = sizeof(struct sockaddr_in6);
2156                 store.sin6.sin6_scope_id = cookie->scope_id;
2157                 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr));
2158                 break;
2159 #endif
2160         default:
2161                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2162                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
2163                 return (NULL);
2164         }
2165
2166         /* update current state */
2167         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2168         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
2169         sctp_stop_all_cookie_timers(stcb);
2170         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2171         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2172
2173         /* set up to notify upper layer */
2174         *notification = SCTP_NOTIFY_ASSOC_UP;
2175         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2176             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2177             (!SCTP_IS_LISTENING(inp))) {
2178                 /*
2179                  * This is an endpoint that called connect() how it got a
2180                  * cookie that is NEW is a bit of a mystery. It must be that
2181                  * the INIT was sent, but before it got there.. a complete
2182                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2183                  * should have went to the other code.. not here.. oh well..
2184                  * a bit of protection is worth having..
2185                  *
2186                  * XXXMJ unlocked
2187                  */
2188                 sctp_pcb_add_flags(stcb->sctp_ep, SCTP_PCB_FLAGS_CONNECTED);
2189                 soisconnected(stcb->sctp_socket);
2190         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2191             (SCTP_IS_LISTENING(inp))) {
2192                 /*
2193                  * We don't want to do anything with this one. Since it is
2194                  * the listening guy. The timer will get started for
2195                  * accepted connections in the caller.
2196                  */
2197                 ;
2198         }
2199         if (stcb->asoc.sctp_autoclose_ticks &&
2200             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2201                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2202         }
2203         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2204         *netp = sctp_findnet(stcb, init_src);
2205         if (*netp != NULL) {
2206                 /*
2207                  * Since we did not send a HB, make sure we don't double
2208                  * things.
2209                  */
2210                 (*netp)->hb_responded = 1;
2211         }
2212         /* respond with a COOKIE-ACK */
2213         sctp_send_cookie_ack(stcb);
2214
2215         /*
2216          * check the address lists for any ASCONFs that need to be sent
2217          * AFTER the cookie-ack is sent
2218          */
2219         sctp_check_address_list(stcb, m,
2220             initack_offset + sizeof(struct sctp_init_ack_chunk),
2221             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2222             &store.sa, cookie->local_scope, cookie->site_scope,
2223             cookie->ipv4_scope, cookie->loopback_scope);
2224
2225         return (stcb);
2226 }
2227
2228 /*
2229  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2230  * we NEED to make sure we are not already using the vtag. If so we
2231  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2232         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2233                                                             SCTP_BASE_INFO(hashasocmark))];
2234         LIST_FOREACH(stcb, head, sctp_asocs) {
2235                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) {
2236                        -- SEND ABORT - TRY AGAIN --
2237                 }
2238         }
2239 */
2240
2241 /*
2242  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2243  * existing (non-NULL) TCB
2244  */
2245 static struct mbuf *
2246 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2247     struct sockaddr *src, struct sockaddr *dst,
2248     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2249     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2250     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2251     struct sctp_tcb **locked_tcb,
2252     uint8_t mflowtype, uint32_t mflowid,
2253     uint32_t vrf_id, uint16_t port)
2254 {
2255         struct sctp_state_cookie *cookie;
2256         struct sctp_tcb *l_stcb = *stcb;
2257         struct sctp_inpcb *l_inp;
2258         struct sockaddr *to;
2259         struct sctp_pcb *ep;
2260         struct mbuf *m_sig;
2261         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2262         uint8_t *sig;
2263         uint8_t cookie_ok = 0;
2264         unsigned int sig_offset, cookie_offset;
2265         unsigned int cookie_len;
2266         struct timeval now;
2267         struct timeval time_entered, time_expires;
2268         int notification = 0;
2269         struct sctp_nets *netl;
2270         int had_a_existing_tcb = 0;
2271         int send_int_conf = 0;
2272 #ifdef INET
2273         struct sockaddr_in sin;
2274 #endif
2275 #ifdef INET6
2276         struct sockaddr_in6 sin6;
2277 #endif
2278
2279         SCTPDBG(SCTP_DEBUG_INPUT2,
2280             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2281
2282         if (inp_p == NULL) {
2283                 return (NULL);
2284         }
2285         cookie = &cp->cookie;
2286         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2287         cookie_len = ntohs(cp->ch.chunk_length);
2288
2289         if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2290             sizeof(struct sctp_init_chunk) +
2291             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2292                 /* cookie too small */
2293                 return (NULL);
2294         }
2295         if ((cookie->peerport != sh->src_port) ||
2296             (cookie->myport != sh->dest_port) ||
2297             (cookie->my_vtag != sh->v_tag)) {
2298                 /*
2299                  * invalid ports or bad tag.  Note that we always leave the
2300                  * v_tag in the header in network order and when we stored
2301                  * it in the my_vtag slot we also left it in network order.
2302                  * This maintains the match even though it may be in the
2303                  * opposite byte order of the machine :->
2304                  */
2305                 return (NULL);
2306         }
2307         /*
2308          * split off the signature into its own mbuf (since it should not be
2309          * calculated in the sctp_hmac_m() call).
2310          */
2311         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2312         m_sig = m_split(m, sig_offset, M_NOWAIT);
2313         if (m_sig == NULL) {
2314                 /* out of memory or ?? */
2315                 return (NULL);
2316         }
2317 #ifdef SCTP_MBUF_LOGGING
2318         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2319                 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT);
2320         }
2321 #endif
2322
2323         /*
2324          * compute the signature/digest for the cookie
2325          */
2326         if (l_stcb != NULL) {
2327                 atomic_add_int(&l_stcb->asoc.refcnt, 1);
2328                 SCTP_TCB_UNLOCK(l_stcb);
2329         }
2330         l_inp = *inp_p;
2331         SCTP_INP_RLOCK(l_inp);
2332         if (l_stcb != NULL) {
2333                 SCTP_TCB_LOCK(l_stcb);
2334                 atomic_subtract_int(&l_stcb->asoc.refcnt, 1);
2335         }
2336         if (l_inp->sctp_flags & (SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
2337                 SCTP_INP_RUNLOCK(l_inp);
2338                 sctp_m_freem(m_sig);
2339                 return (NULL);
2340         }
2341         ep = &(*inp_p)->sctp_ep;
2342         /* which cookie is it? */
2343         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2344             (ep->current_secret_number != ep->last_secret_number)) {
2345                 /* it's the old cookie */
2346                 (void)sctp_hmac_m(SCTP_HMAC,
2347                     (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2348                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2349         } else {
2350                 /* it's the current cookie */
2351                 (void)sctp_hmac_m(SCTP_HMAC,
2352                     (uint8_t *)ep->secret_key[(int)ep->current_secret_number],
2353                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2354         }
2355         /* get the signature */
2356         SCTP_INP_RUNLOCK(l_inp);
2357         sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig);
2358         if (sig == NULL) {
2359                 /* couldn't find signature */
2360                 sctp_m_freem(m_sig);
2361                 return (NULL);
2362         }
2363         /* compare the received digest with the computed digest */
2364         if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2365                 /* try the old cookie? */
2366                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2367                     (ep->current_secret_number != ep->last_secret_number)) {
2368                         /* compute digest with old */
2369                         (void)sctp_hmac_m(SCTP_HMAC,
2370                             (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2371                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2372                         /* compare */
2373                         if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2374                                 cookie_ok = 1;
2375                 }
2376         } else {
2377                 cookie_ok = 1;
2378         }
2379
2380         /*
2381          * Now before we continue we must reconstruct our mbuf so that
2382          * normal processing of any other chunks will work.
2383          */
2384         {
2385                 struct mbuf *m_at;
2386
2387                 m_at = m;
2388                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2389                         m_at = SCTP_BUF_NEXT(m_at);
2390                 }
2391                 SCTP_BUF_NEXT(m_at) = m_sig;
2392         }
2393
2394         if (cookie_ok == 0) {
2395                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2396                 SCTPDBG(SCTP_DEBUG_INPUT2,
2397                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2398                     (uint32_t)offset, cookie_offset, sig_offset);
2399                 return (NULL);
2400         }
2401
2402         if (sctp_ticks_to_msecs(cookie->cookie_life) > SCTP_MAX_COOKIE_LIFE) {
2403                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: Invalid cookie lifetime\n");
2404                 return (NULL);
2405         }
2406         time_entered.tv_sec = cookie->time_entered.tv_sec;
2407         time_entered.tv_usec = cookie->time_entered.tv_usec;
2408         if ((time_entered.tv_sec < 0) ||
2409             (time_entered.tv_usec < 0) ||
2410             (time_entered.tv_usec >= 1000000)) {
2411                 /* Invalid time stamp. Cookie must have been modified. */
2412                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: Invalid time stamp\n");
2413                 return (NULL);
2414         }
2415         (void)SCTP_GETTIME_TIMEVAL(&now);
2416         if (timevalcmp(&now, &time_entered, <)) {
2417                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie generated in the future!\n");
2418                 return (NULL);
2419         }
2420         /*
2421          * Check the cookie timestamps to be sure it's not stale.
2422          * cookie_life is in ticks, so we convert to seconds.
2423          */
2424         time_expires.tv_sec = time_entered.tv_sec + sctp_ticks_to_secs(cookie->cookie_life);
2425         time_expires.tv_usec = time_entered.tv_usec;
2426         if (timevalcmp(&now, &time_expires, >)) {
2427                 /* cookie is stale! */
2428                 struct mbuf *op_err;
2429                 struct sctp_error_stale_cookie *cause;
2430                 struct timeval diff;
2431                 uint32_t staleness;
2432
2433                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie),
2434                     0, M_NOWAIT, 1, MT_DATA);
2435                 if (op_err == NULL) {
2436                         /* FOOBAR */
2437                         return (NULL);
2438                 }
2439                 /* Set the len */
2440                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie);
2441                 cause = mtod(op_err, struct sctp_error_stale_cookie *);
2442                 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE);
2443                 cause->cause.length = htons(sizeof(struct sctp_error_stale_cookie));
2444                 diff = now;
2445                 timevalsub(&diff, &time_expires);
2446                 if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) {
2447                         staleness = UINT32_MAX;
2448                 } else {
2449                         staleness = (uint32_t)diff.tv_sec * 1000000;
2450                 }
2451                 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) {
2452                         staleness += (uint32_t)diff.tv_usec;
2453                 } else {
2454                         staleness = UINT32_MAX;
2455                 }
2456                 cause->stale_time = htonl(staleness);
2457                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
2458                     mflowtype, mflowid, l_inp->fibnum,
2459                     vrf_id, port);
2460                 return (NULL);
2461         }
2462         /*
2463          * Now we must see with the lookup address if we have an existing
2464          * asoc. This will only happen if we were in the COOKIE-WAIT state
2465          * and a INIT collided with us and somewhere the peer sent the
2466          * cookie on another address besides the single address our assoc
2467          * had for him. In this case we will have one of the tie-tags set at
2468          * least AND the address field in the cookie can be used to look it
2469          * up.
2470          */
2471         to = NULL;
2472         switch (cookie->addr_type) {
2473 #ifdef INET6
2474         case SCTP_IPV6_ADDRESS:
2475                 memset(&sin6, 0, sizeof(sin6));
2476                 sin6.sin6_family = AF_INET6;
2477                 sin6.sin6_len = sizeof(sin6);
2478                 sin6.sin6_port = sh->src_port;
2479                 sin6.sin6_scope_id = cookie->scope_id;
2480                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2481                     sizeof(sin6.sin6_addr.s6_addr));
2482                 to = (struct sockaddr *)&sin6;
2483                 break;
2484 #endif
2485 #ifdef INET
2486         case SCTP_IPV4_ADDRESS:
2487                 memset(&sin, 0, sizeof(sin));
2488                 sin.sin_family = AF_INET;
2489                 sin.sin_len = sizeof(sin);
2490                 sin.sin_port = sh->src_port;
2491                 sin.sin_addr.s_addr = cookie->address[0];
2492                 to = (struct sockaddr *)&sin;
2493                 break;
2494 #endif
2495         default:
2496                 /* This should not happen */
2497                 return (NULL);
2498         }
2499         if (*stcb == NULL) {
2500                 /* Yep, lets check */
2501                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
2502                 if (*stcb == NULL) {
2503                         /*
2504                          * We should have only got back the same inp. If we
2505                          * got back a different ep we have a problem. The
2506                          * original findep got back l_inp and now
2507                          */
2508                         if (l_inp != *inp_p) {
2509                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2510                         }
2511                 } else {
2512                         if (*locked_tcb == NULL) {
2513                                 /*
2514                                  * In this case we found the assoc only
2515                                  * after we locked the create lock. This
2516                                  * means we are in a colliding case and we
2517                                  * must make sure that we unlock the tcb if
2518                                  * its one of the cases where we throw away
2519                                  * the incoming packets.
2520                                  */
2521                                 *locked_tcb = *stcb;
2522
2523                                 /*
2524                                  * We must also increment the inp ref count
2525                                  * since the ref_count flags was set when we
2526                                  * did not find the TCB, now we found it
2527                                  * which reduces the refcount.. we must
2528                                  * raise it back out to balance it all :-)
2529                                  */
2530                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2531                                 if ((*stcb)->sctp_ep != l_inp) {
2532                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2533                                             (void *)(*stcb)->sctp_ep, (void *)l_inp);
2534                                 }
2535                         }
2536                 }
2537         }
2538
2539         cookie_len -= SCTP_SIGNATURE_SIZE;
2540         if (*stcb == NULL) {
2541                 /* this is the "normal" case... get a new TCB */
2542                 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
2543                     cookie, cookie_len, *inp_p,
2544                     netp, to, &notification,
2545                     auth_skipped, auth_offset, auth_len,
2546                     mflowtype, mflowid,
2547                     vrf_id, port);
2548         } else {
2549                 /* this is abnormal... cookie-echo on existing TCB */
2550                 had_a_existing_tcb = 1;
2551                 *stcb = sctp_process_cookie_existing(m, iphlen, offset,
2552                     src, dst, sh,
2553                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2554                     &notification, auth_skipped, auth_offset, auth_len,
2555                     mflowtype, mflowid,
2556                     vrf_id, port);
2557                 if (*stcb == NULL) {
2558                         *locked_tcb = NULL;
2559                 }
2560         }
2561
2562         if (*stcb == NULL) {
2563                 /* still no TCB... must be bad cookie-echo */
2564                 return (NULL);
2565         }
2566         if (*netp != NULL) {
2567                 (*netp)->flowtype = mflowtype;
2568                 (*netp)->flowid = mflowid;
2569         }
2570         /*
2571          * Ok, we built an association so confirm the address we sent the
2572          * INIT-ACK to.
2573          */
2574         netl = sctp_findnet(*stcb, to);
2575         /*
2576          * This code should in theory NOT run but
2577          */
2578         if (netl == NULL) {
2579                 /* TSNH! Huh, why do I need to add this address here? */
2580                 if (sctp_add_remote_addr(*stcb, to, NULL, port,
2581                     SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2582                         return (NULL);
2583                 }
2584                 netl = sctp_findnet(*stcb, to);
2585         }
2586         if (netl) {
2587                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2588                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2589                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2590                             netl);
2591                         send_int_conf = 1;
2592                 }
2593         }
2594         sctp_start_net_timers(*stcb);
2595         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2596                 if (!had_a_existing_tcb ||
2597                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2598                         /*
2599                          * If we have a NEW cookie or the connect never
2600                          * reached the connected state during collision we
2601                          * must do the TCP accept thing.
2602                          */
2603                         struct socket *so, *oso;
2604                         struct sctp_inpcb *inp;
2605
2606                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2607                                 /*
2608                                  * For a restart we will keep the same
2609                                  * socket, no need to do anything. I THINK!!
2610                                  */
2611                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2612                                 if (send_int_conf) {
2613                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2614                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2615                                 }
2616                                 return (m);
2617                         }
2618                         oso = (*inp_p)->sctp_socket;
2619                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2620                         SCTP_TCB_UNLOCK((*stcb));
2621                         CURVNET_SET(oso->so_vnet);
2622                         so = sonewconn(oso, 0
2623                             );
2624                         CURVNET_RESTORE();
2625                         SCTP_TCB_LOCK((*stcb));
2626                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2627
2628                         if (so == NULL) {
2629                                 struct mbuf *op_err;
2630
2631                                 /* Too many sockets */
2632                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2633                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2634                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2635                                     src, dst, sh, op_err,
2636                                     mflowtype, mflowid,
2637                                     vrf_id, port);
2638                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC,
2639                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
2640                                 return (NULL);
2641                         }
2642                         inp = (struct sctp_inpcb *)so->so_pcb;
2643                         SCTP_INP_INCR_REF(inp);
2644                         /*
2645                          * We add the unbound flag here so that if we get an
2646                          * soabort() before we get the move_pcb done, we
2647                          * will properly cleanup.
2648                          */
2649                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2650                             SCTP_PCB_FLAGS_CONNECTED |
2651                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2652                             SCTP_PCB_FLAGS_UNBOUND |
2653                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2654                             SCTP_PCB_FLAGS_DONT_WAKE);
2655                         inp->sctp_features = (*inp_p)->sctp_features;
2656                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2657                         inp->sctp_socket = so;
2658                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2659                         inp->max_cwnd = (*inp_p)->max_cwnd;
2660                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2661                         inp->ecn_supported = (*inp_p)->ecn_supported;
2662                         inp->prsctp_supported = (*inp_p)->prsctp_supported;
2663                         inp->auth_supported = (*inp_p)->auth_supported;
2664                         inp->asconf_supported = (*inp_p)->asconf_supported;
2665                         inp->reconfig_supported = (*inp_p)->reconfig_supported;
2666                         inp->nrsack_supported = (*inp_p)->nrsack_supported;
2667                         inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
2668                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2669                         inp->sctp_context = (*inp_p)->sctp_context;
2670                         inp->local_strreset_support = (*inp_p)->local_strreset_support;
2671                         inp->fibnum = (*inp_p)->fibnum;
2672                         /*
2673                          * copy in the authentication parameters from the
2674                          * original endpoint
2675                          */
2676                         if (inp->sctp_ep.local_hmacs)
2677                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2678                         inp->sctp_ep.local_hmacs =
2679                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2680                         if (inp->sctp_ep.local_auth_chunks)
2681                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2682                         inp->sctp_ep.local_auth_chunks =
2683                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2684
2685                         /*
2686                          * Now we must move it from one hash table to
2687                          * another and get the tcb in the right place.
2688                          */
2689
2690                         /*
2691                          * This is where the one-2-one socket is put into
2692                          * the accept state waiting for the accept!
2693                          */
2694                         if (*stcb) {
2695                                 SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE);
2696                         }
2697                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2698
2699                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2700                         SCTP_TCB_UNLOCK((*stcb));
2701
2702                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2703                             0);
2704                         SCTP_TCB_LOCK((*stcb));
2705                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2706
2707                         /*
2708                          * now we must check to see if we were aborted while
2709                          * the move was going on and the lock/unlock
2710                          * happened.
2711                          */
2712                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2713                                 /*
2714                                  * yep it was, we leave the assoc attached
2715                                  * to the socket since the sctp_inpcb_free()
2716                                  * call will send an abort for us.
2717                                  */
2718                                 SCTP_INP_DECR_REF(inp);
2719                                 return (NULL);
2720                         }
2721                         SCTP_INP_DECR_REF(inp);
2722                         /* Switch over to the new guy */
2723                         *inp_p = inp;
2724                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2725                         if (send_int_conf) {
2726                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2727                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2728                         }
2729
2730                         /*
2731                          * Pull it from the incomplete queue and wake the
2732                          * guy
2733                          */
2734                         soisconnected(so);
2735                         return (m);
2736                 }
2737         }
2738         if (notification) {
2739                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2740         }
2741         if (send_int_conf) {
2742                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2743                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2744         }
2745         return (m);
2746 }
2747
2748 static void
2749 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2750     struct sctp_tcb *stcb, struct sctp_nets *net)
2751 {
2752         /* cp must not be used, others call this without a c-ack :-) */
2753         struct sctp_association *asoc;
2754         struct sctp_tmit_chunk *chk;
2755
2756         SCTPDBG(SCTP_DEBUG_INPUT2,
2757             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2758         if ((stcb == NULL) || (net == NULL)) {
2759                 return;
2760         }
2761
2762         asoc = &stcb->asoc;
2763         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
2764                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
2765                     asoc->overall_error_count,
2766                     0,
2767                     SCTP_FROM_SCTP_INPUT,
2768                     __LINE__);
2769         }
2770         sctp_stop_all_cookie_timers(stcb);
2771         sctp_toss_old_cookies(stcb, asoc);
2772         /* process according to association state */
2773         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) {
2774                 /* state change only needed when I am in right state */
2775                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2776                 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
2777                 sctp_start_net_timers(stcb);
2778                 /* update RTO */
2779                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2780                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2781                 if (asoc->overall_error_count == 0) {
2782                         sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered,
2783                             SCTP_RTT_FROM_NON_DATA);
2784                 }
2785                 /*
2786                  * Since we did not send a HB make sure we don't double
2787                  * things.
2788                  */
2789                 asoc->overall_error_count = 0;
2790                 net->hb_responded = 1;
2791                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2792                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2793                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2794                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2795                         sctp_pcb_add_flags(stcb->sctp_ep, SCTP_PCB_FLAGS_CONNECTED);
2796                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
2797                                 soisconnected(stcb->sctp_socket);
2798                         }
2799                 }
2800
2801                 if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) &&
2802                     TAILQ_EMPTY(&asoc->send_queue) &&
2803                     TAILQ_EMPTY(&asoc->sent_queue) &&
2804                     (asoc->stream_queue_cnt == 0)) {
2805                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
2806                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
2807                         sctp_stop_timers_for_shutdown(stcb);
2808                         sctp_send_shutdown(stcb, net);
2809                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
2810                             stcb->sctp_ep, stcb, net);
2811                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2812                             stcb->sctp_ep, stcb, NULL);
2813                         sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_T3, SCTP_SO_LOCKED);
2814                 }
2815
2816                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2817                         /*
2818                          * We don't need to do the asconf thing, nor hb or
2819                          * autoclose if the socket is closed.
2820                          */
2821                         goto closed_socket;
2822                 }
2823
2824                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2825                     stcb, net);
2826
2827                 if (stcb->asoc.sctp_autoclose_ticks &&
2828                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2829                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2830                             stcb->sctp_ep, stcb, NULL);
2831                 }
2832                 /*
2833                  * send ASCONF if parameters are pending and ASCONFs are
2834                  * allowed (eg. addresses changed when init/cookie echo were
2835                  * in flight)
2836                  */
2837                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2838                     (stcb->asoc.asconf_supported == 1) &&
2839                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2840 #ifdef SCTP_TIMER_BASED_ASCONF
2841                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2842                             stcb->sctp_ep, stcb,
2843                             stcb->asoc.primary_destination);
2844 #else
2845                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2846                             SCTP_ADDR_NOT_LOCKED);
2847 #endif
2848                 }
2849         }
2850 closed_socket:
2851         /* Restart the timer if we have pending data */
2852         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
2853                 if (chk->whoTo != NULL) {
2854                         break;
2855                 }
2856         }
2857         if (chk != NULL) {
2858                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
2859         }
2860 }
2861
2862 static void
2863 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
2864     struct sctp_tcb *stcb)
2865 {
2866         struct sctp_nets *net;
2867         struct sctp_tmit_chunk *lchk;
2868         struct sctp_ecne_chunk bkup;
2869         uint8_t override_bit;
2870         uint32_t tsn, window_data_tsn;
2871         int len;
2872         unsigned int pkt_cnt;
2873
2874         len = ntohs(cp->ch.chunk_length);
2875         if (len == sizeof(struct old_sctp_ecne_chunk)) {
2876                 /* Its the old format */
2877                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
2878                 bkup.num_pkts_since_cwr = htonl(1);
2879                 cp = &bkup;
2880         }
2881         SCTP_STAT_INCR(sctps_recvecne);
2882         tsn = ntohl(cp->tsn);
2883         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
2884         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
2885         if (lchk == NULL) {
2886                 window_data_tsn = stcb->asoc.sending_seq - 1;
2887         } else {
2888                 window_data_tsn = lchk->rec.data.tsn;
2889         }
2890
2891         /* Find where it was sent to if possible. */
2892         net = NULL;
2893         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
2894                 if (lchk->rec.data.tsn == tsn) {
2895                         net = lchk->whoTo;
2896                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
2897                         break;
2898                 }
2899                 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) {
2900                         break;
2901                 }
2902         }
2903         if (net == NULL) {
2904                 /*
2905                  * What to do. A previous send of a CWR was possibly lost.
2906                  * See how old it is, we may have it marked on the actual
2907                  * net.
2908                  */
2909                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
2910                         if (tsn == net->last_cwr_tsn) {
2911                                 /* Found him, send it off */
2912                                 break;
2913                         }
2914                 }
2915                 if (net == NULL) {
2916                         /*
2917                          * If we reach here, we need to send a special CWR
2918                          * that says hey, we did this a long time ago and
2919                          * you lost the response.
2920                          */
2921                         net = TAILQ_FIRST(&stcb->asoc.nets);
2922                         if (net == NULL) {
2923                                 /* TSNH */
2924                                 return;
2925                         }
2926                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
2927                 } else {
2928                         override_bit = 0;
2929                 }
2930         } else {
2931                 override_bit = 0;
2932         }
2933         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
2934             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
2935                 /*
2936                  * JRS - Use the congestion control given in the pluggable
2937                  * CC module
2938                  */
2939                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
2940                 /*
2941                  * We reduce once every RTT. So we will only lower cwnd at
2942                  * the next sending seq i.e. the window_data_tsn
2943                  */
2944                 net->cwr_window_tsn = window_data_tsn;
2945                 net->ecn_ce_pkt_cnt += pkt_cnt;
2946                 net->lost_cnt = pkt_cnt;
2947                 net->last_cwr_tsn = tsn;
2948         } else {
2949                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
2950                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
2951                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
2952                         /*
2953                          * Another loss in the same window update how many
2954                          * marks/packets lost we have had.
2955                          */
2956                         int cnt = 1;
2957
2958                         if (pkt_cnt > net->lost_cnt) {
2959                                 /* Should be the case */
2960                                 cnt = (pkt_cnt - net->lost_cnt);
2961                                 net->ecn_ce_pkt_cnt += cnt;
2962                         }
2963                         net->lost_cnt = pkt_cnt;
2964                         net->last_cwr_tsn = tsn;
2965                         /*
2966                          * Most CC functions will ignore this call, since we
2967                          * are in-window yet of the initial CE the peer saw.
2968                          */
2969                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
2970                 }
2971         }
2972         /*
2973          * We always send a CWR this way if our previous one was lost our
2974          * peer will get an update, or if it is not time again to reduce we
2975          * still get the cwr to the peer. Note we set the override when we
2976          * could not find the TSN on the chunk or the destination network.
2977          */
2978         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
2979 }
2980
2981 static void
2982 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
2983 {
2984         /*
2985          * Here we get a CWR from the peer. We must look in the outqueue and
2986          * make sure that we have a covered ECNE in the control chunk part.
2987          * If so remove it.
2988          */
2989         struct sctp_tmit_chunk *chk, *nchk;
2990         struct sctp_ecne_chunk *ecne;
2991         int override;
2992         uint32_t cwr_tsn;
2993
2994         cwr_tsn = ntohl(cp->tsn);
2995         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
2996         TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) {
2997                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
2998                         continue;
2999                 }
3000                 if ((override == 0) && (chk->whoTo != net)) {
3001                         /* Must be from the right src unless override is set */
3002                         continue;
3003                 }
3004                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3005                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3006                         /* this covers this ECNE, we can remove it */
3007                         stcb->asoc.ecn_echo_cnt_onq--;
3008                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3009                             sctp_next);
3010                         stcb->asoc.ctrl_queue_cnt--;
3011                         sctp_m_freem(chk->data);
3012                         chk->data = NULL;
3013                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3014                         if (override == 0) {
3015                                 break;
3016                         }
3017                 }
3018         }
3019 }
3020
3021 static void
3022 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3023     struct sctp_tcb *stcb, struct sctp_nets *net)
3024 {
3025
3026         SCTPDBG(SCTP_DEBUG_INPUT2,
3027             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3028         if (stcb == NULL)
3029                 return;
3030
3031         /* process according to association state */
3032         if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3033                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3034                 SCTPDBG(SCTP_DEBUG_INPUT2,
3035                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3036                 SCTP_TCB_UNLOCK(stcb);
3037                 return;
3038         }
3039         /* notify upper layer protocol */
3040         if (stcb->sctp_socket) {
3041                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3042         }
3043 #ifdef INVARIANTS
3044         if (!TAILQ_EMPTY(&stcb->asoc.send_queue) ||
3045             !TAILQ_EMPTY(&stcb->asoc.sent_queue) ||
3046             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
3047                 panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
3048         }
3049 #endif
3050         /* stop the timer */
3051         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net,
3052             SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3053         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3054         /* free the TCB */
3055         SCTPDBG(SCTP_DEBUG_INPUT2,
3056             "sctp_handle_shutdown_complete: calls free-asoc\n");
3057         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
3058             SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3059         return;
3060 }
3061
3062 static int
3063 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3064     struct sctp_nets *net, uint8_t flg)
3065 {
3066         switch (desc->chunk_type) {
3067         case SCTP_DATA:
3068         case SCTP_IDATA:
3069                 /* find the tsn to resend (possibly) */
3070                 {
3071                         uint32_t tsn;
3072                         struct sctp_tmit_chunk *tp1;
3073
3074                         tsn = ntohl(desc->tsn_ifany);
3075                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3076                                 if (tp1->rec.data.tsn == tsn) {
3077                                         /* found it */
3078                                         break;
3079                                 }
3080                                 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) {
3081                                         /* not found */
3082                                         tp1 = NULL;
3083                                         break;
3084                                 }
3085                         }
3086                         if (tp1 == NULL) {
3087                                 /*
3088                                  * Do it the other way , aka without paying
3089                                  * attention to queue seq order.
3090                                  */
3091                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3092                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3093                                         if (tp1->rec.data.tsn == tsn) {
3094                                                 /* found it */
3095                                                 break;
3096                                         }
3097                                 }
3098                         }
3099                         if (tp1 == NULL) {
3100                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3101                         }
3102                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3103                                 if (((flg & SCTP_BADCRC) == 0) &&
3104                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3105                                         return (0);
3106                                 }
3107                                 if ((stcb->asoc.peers_rwnd == 0) &&
3108                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3109                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3110                                         return (0);
3111                                 }
3112                                 if (stcb->asoc.peers_rwnd == 0 &&
3113                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3114                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3115                                         return (0);
3116                                 }
3117                                 if ((uint32_t)SCTP_BUF_LEN(tp1->data) <
3118                                     SCTP_DATA_CHUNK_OVERHEAD(stcb) + SCTP_NUM_DB_TO_VERIFY) {
3119                                         /* Payload not matching. */
3120                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3121                                         return (-1);
3122                                 }
3123                                 if (memcmp(mtod(tp1->data, caddr_t)+SCTP_DATA_CHUNK_OVERHEAD(stcb),
3124                                     desc->data_bytes, SCTP_NUM_DB_TO_VERIFY) != 0) {
3125                                         /* Payload not matching. */
3126                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3127                                         return (-1);
3128                                 }
3129                                 if (tp1->do_rtt) {
3130                                         /*
3131                                          * this guy had a RTO calculation
3132                                          * pending on it, cancel it
3133                                          */
3134                                         if (tp1->whoTo->rto_needed == 0) {
3135                                                 tp1->whoTo->rto_needed = 1;
3136                                         }
3137                                         tp1->do_rtt = 0;
3138                                 }
3139                                 SCTP_STAT_INCR(sctps_pdrpmark);
3140                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3141                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3142                                 /*
3143                                  * mark it as if we were doing a FR, since
3144                                  * we will be getting gap ack reports behind
3145                                  * the info from the router.
3146                                  */
3147                                 tp1->rec.data.doing_fast_retransmit = 1;
3148                                 /*
3149                                  * mark the tsn with what sequences can
3150                                  * cause a new FR.
3151                                  */
3152                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3153                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3154                                 } else {
3155                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn;
3156                                 }
3157
3158                                 /* restart the timer */
3159                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3160                                     stcb, tp1->whoTo,
3161                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3162                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3163                                     stcb, tp1->whoTo);
3164
3165                                 /* fix counts and things */
3166                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3167                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3168                                             tp1->whoTo->flight_size,
3169                                             tp1->book_size,
3170                                             (uint32_t)(uintptr_t)stcb,
3171                                             tp1->rec.data.tsn);
3172                                 }
3173                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3174                                         sctp_flight_size_decrease(tp1);
3175                                         sctp_total_flight_decrease(stcb, tp1);
3176                                 }
3177                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3178                         } {
3179                                 /* audit code */
3180                                 unsigned int audit;
3181
3182                                 audit = 0;
3183                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3184                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3185                                                 audit++;
3186                                 }
3187                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3188                                     sctp_next) {
3189                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3190                                                 audit++;
3191                                 }
3192                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3193                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3194                                             audit, stcb->asoc.sent_queue_retran_cnt);
3195 #ifndef SCTP_AUDITING_ENABLED
3196                                         stcb->asoc.sent_queue_retran_cnt = audit;
3197 #endif
3198                                 }
3199                         }
3200                 }
3201                 break;
3202         case SCTP_ASCONF:
3203                 {
3204                         struct sctp_tmit_chunk *asconf;
3205
3206                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3207                             sctp_next) {
3208                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3209                                         break;
3210                                 }
3211                         }
3212                         if (asconf) {
3213                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3214                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3215                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3216                                 asconf->snd_count--;
3217                         }
3218                 }
3219                 break;
3220         case SCTP_INITIATION:
3221                 /* resend the INIT */
3222                 stcb->asoc.dropped_special_cnt++;
3223                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3224                         /*
3225                          * If we can get it in, in a few attempts we do
3226                          * this, otherwise we let the timer fire.
3227                          */
3228                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3229                             stcb, net,
3230                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
3231                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3232                 }
3233                 break;
3234         case SCTP_SELECTIVE_ACK:
3235         case SCTP_NR_SELECTIVE_ACK:
3236                 /* resend the sack */
3237                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3238                 break;
3239         case SCTP_HEARTBEAT_REQUEST:
3240                 /* resend a demand HB */
3241                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3242                         /*
3243                          * Only retransmit if we KNOW we wont destroy the
3244                          * tcb
3245                          */
3246                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3247                 }
3248                 break;
3249         case SCTP_SHUTDOWN:
3250                 sctp_send_shutdown(stcb, net);
3251                 break;
3252         case SCTP_SHUTDOWN_ACK:
3253                 sctp_send_shutdown_ack(stcb, net);
3254                 break;
3255         case SCTP_COOKIE_ECHO:
3256                 {
3257                         struct sctp_tmit_chunk *cookie;
3258
3259                         cookie = NULL;
3260                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3261                             sctp_next) {
3262                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3263                                         break;
3264                                 }
3265                         }
3266                         if (cookie) {
3267                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3268                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3269                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3270                                 sctp_stop_all_cookie_timers(stcb);
3271                         }
3272                 }
3273                 break;
3274         case SCTP_COOKIE_ACK:
3275                 sctp_send_cookie_ack(stcb);
3276                 break;
3277         case SCTP_ASCONF_ACK:
3278                 /* resend last asconf ack */
3279                 sctp_send_asconf_ack(stcb);
3280                 break;
3281         case SCTP_IFORWARD_CUM_TSN:
3282         case SCTP_FORWARD_CUM_TSN:
3283                 send_forward_tsn(stcb, &stcb->asoc);
3284                 break;
3285                 /* can't do anything with these */
3286         case SCTP_PACKET_DROPPED:
3287         case SCTP_INITIATION_ACK:       /* this should not happen */
3288         case SCTP_HEARTBEAT_ACK:
3289         case SCTP_ABORT_ASSOCIATION:
3290         case SCTP_OPERATION_ERROR:
3291         case SCTP_SHUTDOWN_COMPLETE:
3292         case SCTP_ECN_ECHO:
3293         case SCTP_ECN_CWR:
3294         default:
3295                 break;
3296         }
3297         return (0);
3298 }
3299
3300 void
3301 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3302 {
3303         uint32_t i;
3304         uint16_t temp;
3305
3306         /*
3307          * We set things to 0xffffffff since this is the last delivered
3308          * sequence and we will be sending in 0 after the reset.
3309          */
3310
3311         if (number_entries) {
3312                 for (i = 0; i < number_entries; i++) {
3313                         temp = ntohs(list[i]);
3314                         if (temp >= stcb->asoc.streamincnt) {
3315                                 continue;
3316                         }
3317                         stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff;
3318                 }
3319         } else {
3320                 list = NULL;
3321                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3322                         stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
3323                 }
3324         }
3325         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3326 }
3327
3328 static void
3329 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3330 {
3331         uint32_t i;
3332         uint16_t temp;
3333
3334         if (number_entries > 0) {
3335                 for (i = 0; i < number_entries; i++) {
3336                         temp = ntohs(list[i]);
3337                         if (temp >= stcb->asoc.streamoutcnt) {
3338                                 /* no such stream */
3339                                 continue;
3340                         }
3341                         stcb->asoc.strmout[temp].next_mid_ordered = 0;
3342                         stcb->asoc.strmout[temp].next_mid_unordered = 0;
3343                 }
3344         } else {
3345                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3346                         stcb->asoc.strmout[i].next_mid_ordered = 0;
3347                         stcb->asoc.strmout[i].next_mid_unordered = 0;
3348                 }
3349         }
3350         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3351 }
3352
3353 static void
3354 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3355 {
3356         uint32_t i;
3357         uint16_t temp;
3358
3359         if (number_entries > 0) {
3360                 for (i = 0; i < number_entries; i++) {
3361                         temp = ntohs(list[i]);
3362                         if (temp >= stcb->asoc.streamoutcnt) {
3363                                 /* no such stream */
3364                                 continue;
3365                         }
3366                         stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN;
3367                 }
3368         } else {
3369                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3370                         stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN;
3371                 }
3372         }
3373 }
3374
3375 struct sctp_stream_reset_request *
3376 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3377 {
3378         struct sctp_association *asoc;
3379         struct sctp_chunkhdr *ch;
3380         struct sctp_stream_reset_request *r;
3381         struct sctp_tmit_chunk *chk;
3382         int len, clen;
3383
3384         asoc = &stcb->asoc;
3385         chk = asoc->str_reset;
3386         if (TAILQ_EMPTY(&asoc->control_send_queue) ||
3387             (chk == NULL)) {
3388                 asoc->stream_reset_outstanding = 0;
3389                 return (NULL);
3390         }
3391         if (chk->data == NULL) {
3392                 return (NULL);
3393         }
3394         if (bchk != NULL) {
3395                 /* he wants a copy of the chk pointer */
3396                 *bchk = chk;
3397         }
3398         clen = chk->send_size;
3399         ch = mtod(chk->data, struct sctp_chunkhdr *);
3400         r = (struct sctp_stream_reset_request *)(ch + 1);
3401         if (ntohl(r->request_seq) == seq) {
3402                 /* found it */
3403                 return (r);
3404         }
3405         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3406         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3407                 /* move to the next one, there can only be a max of two */
3408                 r = (struct sctp_stream_reset_request *)((caddr_t)r + len);
3409                 if (ntohl(r->request_seq) == seq) {
3410                         return (r);
3411                 }
3412         }
3413         /* that seq is not here */
3414         return (NULL);
3415 }
3416
3417 static void
3418 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3419 {
3420         struct sctp_association *asoc;
3421         struct sctp_tmit_chunk *chk;
3422
3423         asoc = &stcb->asoc;
3424         chk = asoc->str_reset;
3425         if (chk == NULL) {
3426                 return;
3427         }
3428         asoc->str_reset = NULL;
3429         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb,
3430             NULL, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28);
3431         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
3432         asoc->ctrl_queue_cnt--;
3433         if (chk->data) {
3434                 sctp_m_freem(chk->data);
3435                 chk->data = NULL;
3436         }
3437         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3438 }
3439
3440 static int
3441 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3442     uint32_t seq, uint32_t action,
3443     struct sctp_stream_reset_response *respin)
3444 {
3445         uint16_t type;
3446         int lparam_len;
3447         struct sctp_association *asoc = &stcb->asoc;
3448         struct sctp_tmit_chunk *chk;
3449         struct sctp_stream_reset_request *req_param;
3450         struct sctp_stream_reset_out_request *req_out_param;
3451         struct sctp_stream_reset_in_request *req_in_param;
3452         uint32_t number_entries;
3453
3454         if (asoc->stream_reset_outstanding == 0) {
3455                 /* duplicate */
3456                 return (0);
3457         }
3458         if (seq == stcb->asoc.str_reset_seq_out) {
3459                 req_param = sctp_find_stream_reset(stcb, seq, &chk);
3460                 if (req_param != NULL) {
3461                         stcb->asoc.str_reset_seq_out++;
3462                         type = ntohs(req_param->ph.param_type);
3463                         lparam_len = ntohs(req_param->ph.param_length);
3464                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3465                                 int no_clear = 0;
3466
3467                                 req_out_param = (struct sctp_stream_reset_out_request *)req_param;
3468                                 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3469                                 asoc->stream_reset_out_is_outstanding = 0;
3470                                 if (asoc->stream_reset_outstanding)
3471                                         asoc->stream_reset_outstanding--;
3472                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3473                                         /* do it */
3474                                         sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
3475                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3476                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3477                                 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) {
3478                                         /*
3479                                          * Set it up so we don't stop
3480                                          * retransmitting
3481                                          */
3482                                         asoc->stream_reset_outstanding++;
3483                                         stcb->asoc.str_reset_seq_out--;
3484                                         asoc->stream_reset_out_is_outstanding = 1;
3485                                         no_clear = 1;
3486                                 } else {
3487                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3488                                 }
3489                                 if (no_clear == 0) {
3490                                         sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams);
3491                                 }
3492                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3493                                 req_in_param = (struct sctp_stream_reset_in_request *)req_param;
3494                                 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3495                                 if (asoc->stream_reset_outstanding)
3496                                         asoc->stream_reset_outstanding--;
3497                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3498                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3499                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3500                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3501                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3502                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3503                                 }
3504                         } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3505                                 /* Ok we now may have more streams */
3506                                 int num_stream;
3507
3508                                 num_stream = stcb->asoc.strm_pending_add_size;
3509                                 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3510                                         /* TSNH */
3511                                         num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3512                                 }
3513                                 stcb->asoc.strm_pending_add_size = 0;
3514                                 if (asoc->stream_reset_outstanding)
3515                                         asoc->stream_reset_outstanding--;
3516                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3517                                         /* Put the new streams into effect */
3518                                         int i;
3519
3520                                         for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) {
3521                                                 asoc->strmout[i].state = SCTP_STREAM_OPEN;
3522                                         }
3523                                         asoc->streamoutcnt += num_stream;
3524                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3525                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3526                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3527                                             SCTP_STREAM_CHANGE_DENIED);
3528                                 } else {
3529                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3530                                             SCTP_STREAM_CHANGE_FAILED);
3531                                 }
3532                         } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3533                                 if (asoc->stream_reset_outstanding)
3534                                         asoc->stream_reset_outstanding--;
3535                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3536                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3537                                             SCTP_STREAM_CHANGE_DENIED);
3538                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3539                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3540                                             SCTP_STREAM_CHANGE_FAILED);
3541                                 }
3542                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3543                                 /**
3544                                  * a) Adopt the new in tsn.
3545                                  * b) reset the map
3546                                  * c) Adopt the new out-tsn
3547                                  */
3548                                 struct sctp_stream_reset_response_tsn *resp;
3549                                 struct sctp_forward_tsn_chunk fwdtsn;
3550                                 int abort_flag = 0;
3551
3552                                 if (respin == NULL) {
3553                                         /* huh ? */
3554                                         return (0);
3555                                 }
3556                                 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
3557                                         return (0);
3558                                 }
3559                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3560                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3561                                         asoc->stream_reset_outstanding--;
3562                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3563                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3564                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3565                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3566                                         if (abort_flag) {
3567                                                 return (1);
3568                                         }
3569                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3570                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3571                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3572                                         }
3573
3574                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3575                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3576                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3577
3578                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3579                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3580
3581                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3582                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3583
3584                                         sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3585                                         sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3586                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3587                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3588                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3589                                             SCTP_ASSOC_RESET_DENIED);
3590                                 } else {
3591                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3592                                             SCTP_ASSOC_RESET_FAILED);
3593                                 }
3594                         }
3595                         /* get rid of the request and get the request flags */
3596                         if (asoc->stream_reset_outstanding == 0) {
3597                                 sctp_clean_up_stream_reset(stcb);
3598                         }
3599                 }
3600         }
3601         if (asoc->stream_reset_outstanding == 0) {
3602                 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3603         }
3604         return (0);
3605 }
3606
3607 static void
3608 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3609     struct sctp_tmit_chunk *chk,
3610     struct sctp_stream_reset_in_request *req, int trunc)
3611 {
3612         uint32_t seq;
3613         int len, i;
3614         int number_entries;
3615         uint16_t temp;
3616
3617         /*
3618          * peer wants me to send a str-reset to him for my outgoing seq's if
3619          * seq_in is right.
3620          */
3621         struct sctp_association *asoc = &stcb->asoc;
3622
3623         seq = ntohl(req->request_seq);
3624         if (asoc->str_reset_seq_in == seq) {
3625                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3626                 if ((asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ) == 0) {
3627                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3628                 } else if (trunc) {
3629                         /* Can't do it, since they exceeded our buffer size  */
3630                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3631                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3632                         len = ntohs(req->ph.param_length);
3633                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3634                         if (number_entries) {
3635                                 for (i = 0; i < number_entries; i++) {
3636                                         temp = ntohs(req->list_of_streams[i]);
3637                                         if (temp >= stcb->asoc.streamoutcnt) {
3638                                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3639                                                 goto bad_boy;
3640                                         }
3641                                         req->list_of_streams[i] = temp;
3642                                 }
3643                                 for (i = 0; i < number_entries; i++) {
3644                                         if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) {
3645                                                 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING;
3646                                         }
3647                                 }
3648                         } else {
3649                                 /* Its all */
3650                                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3651                                         if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN)
3652                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING;
3653                                 }
3654                         }
3655                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3656                 } else {
3657                         /* Can't do it, since we have sent one out */
3658                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3659                 }
3660 bad_boy:
3661                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3662                 asoc->str_reset_seq_in++;
3663         } else if (asoc->str_reset_seq_in - 1 == seq) {
3664                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3665         } else if (asoc->str_reset_seq_in - 2 == seq) {
3666                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3667         } else {
3668                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3669         }
3670         sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3671 }
3672
3673 static int
3674 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3675     struct sctp_tmit_chunk *chk,
3676     struct sctp_stream_reset_tsn_request *req)
3677 {
3678         /* reset all in and out and update the tsn */
3679         /*
3680          * A) reset my str-seq's on in and out. B) Select a receive next,
3681          * and set cum-ack to it. Also process this selected number as a
3682          * fwd-tsn as well. C) set in the response my next sending seq.
3683          */
3684         struct sctp_forward_tsn_chunk fwdtsn;
3685         struct sctp_association *asoc = &stcb->asoc;
3686         int abort_flag = 0;
3687         uint32_t seq;
3688
3689         seq = ntohl(req->request_seq);
3690         if (asoc->str_reset_seq_in == seq) {
3691                 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3692                 if ((asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ) == 0) {
3693                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3694                 } else {
3695                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3696                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3697                         fwdtsn.ch.chunk_flags = 0;
3698                         fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3699                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3700                         if (abort_flag) {
3701                                 return (1);
3702                         }
3703                         asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3704                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3705                                 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3706                         }
3707                         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3708                         asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3709                         memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3710                         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3711                         memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3712                         atomic_add_int(&asoc->sending_seq, 1);
3713                         /* save off historical data for retrans */
3714                         asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3715                         asoc->last_sending_seq[0] = asoc->sending_seq;
3716                         asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3717                         asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3718                         sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3719                         sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3720                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3721                         sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3722                 }
3723                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3724                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3725                 asoc->str_reset_seq_in++;
3726         } else if (asoc->str_reset_seq_in - 1 == seq) {
3727                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3728                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3729         } else if (asoc->str_reset_seq_in - 2 == seq) {
3730                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3731                     asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3732         } else {
3733                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3734         }
3735         return (0);
3736 }
3737
3738 static void
3739 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3740     struct sctp_tmit_chunk *chk,
3741     struct sctp_stream_reset_out_request *req, int trunc)
3742 {
3743         uint32_t seq, tsn;
3744         int number_entries, len;
3745         struct sctp_association *asoc = &stcb->asoc;
3746
3747         seq = ntohl(req->request_seq);
3748
3749         /* now if its not a duplicate we process it */
3750         if (asoc->str_reset_seq_in == seq) {
3751                 len = ntohs(req->ph.param_length);
3752                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3753                 /*
3754                  * the sender is resetting, handle the list issue.. we must
3755                  * a) verify if we can do the reset, if so no problem b) If
3756                  * we can't do the reset we must copy the request. c) queue
3757                  * it, and setup the data in processor to trigger it off
3758                  * when needed and dequeue all the queued data.
3759                  */
3760                 tsn = ntohl(req->send_reset_at_tsn);
3761
3762                 /* move the reset action back one */
3763                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3764                 if ((asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ) == 0) {
3765                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3766                 } else if (trunc) {
3767                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3768                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3769                         /* we can do it now */
3770                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3771                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3772                 } else {
3773                         /*
3774                          * we must queue it up and thus wait for the TSN's
3775                          * to arrive that are at or before tsn
3776                          */
3777                         struct sctp_stream_reset_list *liste;
3778                         int siz;
3779
3780                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3781                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3782                             siz, SCTP_M_STRESET);
3783                         if (liste == NULL) {
3784                                 /* gak out of memory */
3785                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3786                                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3787                                 return;
3788                         }
3789                         liste->seq = seq;
3790                         liste->tsn = tsn;
3791                         liste->number_entries = number_entries;
3792                         memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
3793                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3794                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS;
3795                 }
3796                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3797                 asoc->str_reset_seq_in++;
3798         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3799                 /*
3800                  * one seq back, just echo back last action since my
3801                  * response was lost.
3802                  */
3803                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3804         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3805                 /*
3806                  * two seq back, just echo back last action since my
3807                  * response was lost.
3808                  */
3809                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3810         } else {
3811                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3812         }
3813 }
3814
3815 static void
3816 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3817     struct sctp_stream_reset_add_strm *str_add)
3818 {
3819         /*
3820          * Peer is requesting to add more streams. If its within our
3821          * max-streams we will allow it.
3822          */
3823         uint32_t num_stream, i;
3824         uint32_t seq;
3825         struct sctp_association *asoc = &stcb->asoc;
3826         struct sctp_queued_to_read *ctl, *nctl;
3827
3828         /* Get the number. */
3829         seq = ntohl(str_add->request_seq);
3830         num_stream = ntohs(str_add->number_of_streams);
3831         /* Now what would be the new total? */
3832         if (asoc->str_reset_seq_in == seq) {
3833                 num_stream += stcb->asoc.streamincnt;
3834                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3835                 if ((asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ) == 0) {
3836                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3837                 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
3838                     (num_stream > 0xffff)) {
3839                         /* We must reject it they ask for to many */
3840         denied:
3841                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3842                 } else {
3843                         /* Ok, we can do that :-) */
3844                         struct sctp_stream_in *oldstrm;
3845
3846                         /* save off the old */
3847                         oldstrm = stcb->asoc.strmin;
3848                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
3849                             (num_stream * sizeof(struct sctp_stream_in)),
3850                             SCTP_M_STRMI);
3851                         if (stcb->asoc.strmin == NULL) {
3852                                 stcb->asoc.strmin = oldstrm;
3853                                 goto denied;
3854                         }
3855                         /* copy off the old data */
3856                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
3857                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3858                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
3859                                 stcb->asoc.strmin[i].sid = i;
3860                                 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered;
3861                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
3862                                 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started;
3863                                 /* now anything on those queues? */
3864                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) {
3865                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm);
3866                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm);
3867                                 }
3868                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) {
3869                                         TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm);
3870                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm);
3871                                 }
3872                         }
3873                         /* Init the new streams */
3874                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
3875                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3876                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
3877                                 stcb->asoc.strmin[i].sid = i;
3878                                 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
3879                                 stcb->asoc.strmin[i].pd_api_started = 0;
3880                                 stcb->asoc.strmin[i].delivery_started = 0;
3881                         }
3882                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
3883                         /* update the size */
3884                         stcb->asoc.streamincnt = num_stream;
3885                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3886                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3887                 }
3888                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3889                 asoc->str_reset_seq_in++;
3890         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3891                 /*
3892                  * one seq back, just echo back last action since my
3893                  * response was lost.
3894                  */
3895                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3896         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3897                 /*
3898                  * two seq back, just echo back last action since my
3899                  * response was lost.
3900                  */
3901                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3902         } else {
3903                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3904         }
3905 }
3906
3907 static void
3908 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3909     struct sctp_stream_reset_add_strm *str_add)
3910 {
3911         /*
3912          * Peer is requesting to add more streams. If its within our
3913          * max-streams we will allow it.
3914          */
3915         uint16_t num_stream;
3916         uint32_t seq;
3917         struct sctp_association *asoc = &stcb->asoc;
3918
3919         /* Get the number. */
3920         seq = ntohl(str_add->request_seq);
3921         num_stream = ntohs(str_add->number_of_streams);
3922         /* Now what would be the new total? */
3923         if (asoc->str_reset_seq_in == seq) {
3924                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3925                 if ((asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ) == 0) {
3926                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3927                 } else if (stcb->asoc.stream_reset_outstanding) {
3928                         /* We must reject it we have something pending */
3929                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3930                 } else {
3931                         /* Ok, we can do that :-) */
3932                         int mychk;
3933
3934                         mychk = stcb->asoc.streamoutcnt;
3935                         mychk += num_stream;
3936                         if (mychk < 0x10000) {
3937                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3938                                 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) {
3939                                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3940                                 }
3941                         } else {
3942                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3943                         }
3944                 }
3945                 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
3946                 asoc->str_reset_seq_in++;
3947         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3948                 /*
3949                  * one seq back, just echo back last action since my
3950                  * response was lost.
3951                  */
3952                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3953         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3954                 /*
3955                  * two seq back, just echo back last action since my
3956                  * response was lost.
3957                  */
3958                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3959         } else {
3960                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3961         }
3962 }
3963
3964 #ifdef __GNUC__
3965 __attribute__((noinline))
3966 #endif
3967 static int
3968 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
3969     struct sctp_chunkhdr *ch_req)
3970 {
3971         uint16_t remaining_length, param_len, ptype;
3972         struct sctp_paramhdr pstore;
3973         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
3974         uint32_t seq = 0;
3975         int num_req = 0;
3976         int trunc = 0;
3977         struct sctp_tmit_chunk *chk;
3978         struct sctp_chunkhdr *ch;
3979         struct sctp_paramhdr *ph;
3980         int ret_code = 0;
3981         int num_param = 0;
3982
3983         /* now it may be a reset or a reset-response */
3984         remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
3985
3986         /* setup for adding the response */
3987         sctp_alloc_a_chunk(stcb, chk);
3988         if (chk == NULL) {
3989                 return (ret_code);
3990         }
3991         chk->copy_by_ref = 0;
3992         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
3993         chk->rec.chunk_id.can_take_data = 0;
3994         chk->flags = 0;
3995         chk->asoc = &stcb->asoc;
3996         chk->no_fr_allowed = 0;
3997         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
3998         chk->book_size_scale = 0;
3999         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
4000         if (chk->data == NULL) {
4001 strres_nochunk:
4002                 if (chk->data) {
4003                         sctp_m_freem(chk->data);
4004                         chk->data = NULL;
4005                 }
4006                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
4007                 return (ret_code);
4008         }
4009         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
4010
4011         /* setup chunk parameters */
4012         chk->sent = SCTP_DATAGRAM_UNSENT;
4013         chk->snd_count = 0;
4014         chk->whoTo = NULL;
4015
4016         ch = mtod(chk->data, struct sctp_chunkhdr *);
4017         ch->chunk_type = SCTP_STREAM_RESET;
4018         ch->chunk_flags = 0;
4019         ch->chunk_length = htons(chk->send_size);
4020         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4021         offset += sizeof(struct sctp_chunkhdr);
4022         while (remaining_length >= sizeof(struct sctp_paramhdr)) {
4023                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore);
4024                 if (ph == NULL) {
4025                         /* TSNH */
4026                         break;
4027                 }
4028                 param_len = ntohs(ph->param_length);
4029                 if ((param_len > remaining_length) ||
4030                     (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
4031                         /* bad parameter length */
4032                         break;
4033                 }
4034                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
4035                     (uint8_t *)&cstore);
4036                 if (ph == NULL) {
4037                         /* TSNH */
4038                         break;
4039                 }
4040                 ptype = ntohs(ph->param_type);
4041                 num_param++;
4042                 if (param_len > sizeof(cstore)) {
4043                         trunc = 1;
4044                 } else {
4045                         trunc = 0;
4046                 }
4047                 if (num_param > SCTP_MAX_RESET_PARAMS) {
4048                         /* hit the max of parameters already sorry.. */
4049                         break;
4050                 }
4051                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4052                         struct sctp_stream_reset_out_request *req_out;
4053
4054                         if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
4055                                 break;
4056                         }
4057                         req_out = (struct sctp_stream_reset_out_request *)ph;
4058                         num_req++;
4059                         if (stcb->asoc.stream_reset_outstanding) {
4060                                 seq = ntohl(req_out->response_seq);
4061                                 if (seq == stcb->asoc.str_reset_seq_out) {
4062                                         /* implicit ack */
4063                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4064                                 }
4065                         }
4066                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4067                 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4068                         struct sctp_stream_reset_add_strm *str_add;
4069
4070                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4071                                 break;
4072                         }
4073                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4074                         num_req++;
4075                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4076                 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4077                         struct sctp_stream_reset_add_strm *str_add;
4078
4079                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4080                                 break;
4081                         }
4082                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4083                         num_req++;
4084                         sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4085                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4086                         struct sctp_stream_reset_in_request *req_in;
4087
4088                         num_req++;
4089                         req_in = (struct sctp_stream_reset_in_request *)ph;
4090                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4091                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4092                         struct sctp_stream_reset_tsn_request *req_tsn;
4093
4094                         num_req++;
4095                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4096                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4097                                 ret_code = 1;
4098                                 goto strres_nochunk;
4099                         }
4100                         /* no more */
4101                         break;
4102                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4103                         struct sctp_stream_reset_response *resp;
4104                         uint32_t result;
4105
4106                         if (param_len < sizeof(struct sctp_stream_reset_response)) {
4107                                 break;
4108                         }
4109                         resp = (struct sctp_stream_reset_response *)ph;
4110                         seq = ntohl(resp->response_seq);
4111                         result = ntohl(resp->result);
4112                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4113                                 ret_code = 1;
4114                                 goto strres_nochunk;
4115                         }
4116                 } else {
4117                         break;
4118                 }
4119                 offset += SCTP_SIZE32(param_len);
4120                 if (remaining_length >= SCTP_SIZE32(param_len)) {
4121                         remaining_length -= SCTP_SIZE32(param_len);
4122                 } else {
4123                         remaining_length = 0;
4124                 }
4125         }
4126         if (num_req == 0) {
4127                 /* we have no response free the stuff */
4128                 goto strres_nochunk;
4129         }
4130         /* ok we have a chunk to link in */
4131         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4132             chk,
4133             sctp_next);
4134         stcb->asoc.ctrl_queue_cnt++;
4135         return (ret_code);
4136 }
4137
4138 /*
4139  * Handle a router or endpoints report of a packet loss, there are two ways
4140  * to handle this, either we get the whole packet and must disect it
4141  * ourselves (possibly with truncation and or corruption) or it is a summary
4142  * from a middle box that did the disecting for us.
4143  */
4144 static void
4145 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4146     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4147 {
4148         struct sctp_chunk_desc desc;
4149         struct sctp_chunkhdr *chk_hdr;
4150         struct sctp_data_chunk *data_chunk;
4151         struct sctp_idata_chunk *idata_chunk;
4152         uint32_t bottle_bw, on_queue;
4153         uint32_t offset, chk_len;
4154         uint16_t pktdrp_len;
4155         uint8_t pktdrp_flags;
4156
4157         KASSERT(sizeof(struct sctp_pktdrop_chunk) <= limit,
4158             ("PKTDROP chunk too small"));
4159         pktdrp_flags = cp->ch.chunk_flags;
4160         pktdrp_len = ntohs(cp->ch.chunk_length);
4161         KASSERT(limit <= pktdrp_len, ("Inconsistent limit"));
4162         if (pktdrp_flags & SCTP_PACKET_TRUNCATED) {
4163                 if (ntohs(cp->trunc_len) <= pktdrp_len - sizeof(struct sctp_pktdrop_chunk)) {
4164                         /* The peer plays games with us. */
4165                         return;
4166                 }
4167         }
4168         limit -= sizeof(struct sctp_pktdrop_chunk);
4169         offset = 0;
4170         if (offset == limit) {
4171                 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4172                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4173                 }
4174         } else if (offset + sizeof(struct sctphdr) > limit) {
4175                 /* Only a partial SCTP common header. */
4176                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4177                 offset = limit;
4178         } else {
4179                 /* XXX: Check embedded SCTP common header. */
4180                 offset += sizeof(struct sctphdr);
4181         }
4182         /* Now parse through the chunks themselves. */
4183         while (offset < limit) {
4184                 if (offset + sizeof(struct sctp_chunkhdr) > limit) {
4185                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4186                         break;
4187                 }
4188                 chk_hdr = (struct sctp_chunkhdr *)(cp->data + offset);
4189                 desc.chunk_type = chk_hdr->chunk_type;
4190                 /* get amount we need to move */
4191                 chk_len = (uint32_t)ntohs(chk_hdr->chunk_length);
4192                 if (chk_len < sizeof(struct sctp_chunkhdr)) {
4193                         /* Someone is lying... */
4194                         break;
4195                 }
4196                 if (desc.chunk_type == SCTP_DATA) {
4197                         if (stcb->asoc.idata_supported) {
4198                                 /* Some is playing games with us. */
4199                                 break;
4200                         }
4201                         if (chk_len <= sizeof(struct sctp_data_chunk)) {
4202                                 /* Some is playing games with us. */
4203                                 break;
4204                         }
4205                         if (chk_len < sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY) {
4206                                 /*
4207                                  * Not enough data bytes available in the
4208                                  * chunk.
4209                                  */
4210                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4211                                 goto next_chunk;
4212                         }
4213                         if (offset + sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) {
4214                                 /* Not enough data in buffer. */
4215                                 break;
4216                         }
4217                         data_chunk = (struct sctp_data_chunk *)(cp->data + offset);
4218                         memcpy(desc.data_bytes, data_chunk + 1, SCTP_NUM_DB_TO_VERIFY);
4219                         desc.tsn_ifany = data_chunk->dp.tsn;
4220                         if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4221                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4222                         }
4223                 } else if (desc.chunk_type == SCTP_IDATA) {
4224                         if (!stcb->asoc.idata_supported) {
4225                                 /* Some is playing games with us. */
4226                                 break;
4227                         }
4228                         if (chk_len <= sizeof(struct sctp_idata_chunk)) {
4229                                 /* Some is playing games with us. */
4230                                 break;
4231                         }
4232                         if (chk_len < sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY) {
4233                                 /*
4234                                  * Not enough data bytes available in the
4235                                  * chunk.
4236                                  */
4237                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4238                                 goto next_chunk;
4239                         }
4240                         if (offset + sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) {
4241                                 /* Not enough data in buffer. */
4242                                 break;
4243                         }
4244                         idata_chunk = (struct sctp_idata_chunk *)(cp->data + offset);
4245                         memcpy(desc.data_bytes, idata_chunk + 1, SCTP_NUM_DB_TO_VERIFY);
4246                         desc.tsn_ifany = idata_chunk->dp.tsn;
4247                         if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4248                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4249                         }
4250                 } else {
4251                         if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4252                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4253                         }
4254                 }
4255                 if (process_chunk_drop(stcb, &desc, net, pktdrp_flags)) {
4256                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4257                         break;
4258                 }
4259 next_chunk:
4260                 offset += SCTP_SIZE32(chk_len);
4261         }
4262         /* Now update any rwnd --- possibly */
4263         if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4264                 /* From a peer, we get a rwnd report */
4265                 uint32_t a_rwnd;
4266
4267                 SCTP_STAT_INCR(sctps_pdrpfehos);
4268
4269                 bottle_bw = ntohl(cp->bottle_bw);
4270                 on_queue = ntohl(cp->current_onq);
4271                 if (bottle_bw && on_queue) {
4272                         /* a rwnd report is in here */
4273                         if (bottle_bw > on_queue)
4274                                 a_rwnd = bottle_bw - on_queue;
4275                         else
4276                                 a_rwnd = 0;
4277
4278                         if (a_rwnd == 0)
4279                                 stcb->asoc.peers_rwnd = 0;
4280                         else {
4281                                 if (a_rwnd > stcb->asoc.total_flight) {
4282                                         stcb->asoc.peers_rwnd =
4283                                             a_rwnd - stcb->asoc.total_flight;
4284                                 } else {
4285                                         stcb->asoc.peers_rwnd = 0;
4286                                 }
4287                                 if (stcb->asoc.peers_rwnd <
4288                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4289                                         /* SWS sender side engages */
4290                                         stcb->asoc.peers_rwnd = 0;
4291                                 }
4292                         }
4293                 }
4294         } else {
4295                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4296         }
4297
4298         /* now middle boxes in sat networks get a cwnd bump */
4299         if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) &&
4300             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4301             (stcb->asoc.sat_network)) {
4302                 /*
4303                  * This is debatable but for sat networks it makes sense
4304                  * Note if a T3 timer has went off, we will prohibit any
4305                  * changes to cwnd until we exit the t3 loss recovery.
4306                  */
4307                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4308                     net, cp, &bottle_bw, &on_queue);
4309         }
4310 }
4311
4312 /*
4313  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4314  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4315  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4316  * length of the complete packet outputs: - length: modified to remaining
4317  * length after control processing - netp: modified to new sctp_nets after
4318  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4319  * bad packet,...) otherwise return the tcb for this packet
4320  */
4321 #ifdef __GNUC__
4322 __attribute__((noinline))
4323 #endif
4324 static struct sctp_tcb *
4325 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4326     struct sockaddr *src, struct sockaddr *dst,
4327     struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4328     struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4329     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
4330     uint32_t vrf_id, uint16_t port)
4331 {
4332         struct sctp_association *asoc;
4333         struct mbuf *op_err;
4334         char msg[SCTP_DIAG_INFO_LEN];
4335         uint32_t vtag_in;
4336         int num_chunks = 0;     /* number of control chunks processed */
4337         uint32_t chk_length, contiguous;
4338         int ret;
4339         int abort_no_unlock = 0;
4340         int ecne_seen = 0;
4341         int abort_flag;
4342
4343         /*
4344          * How big should this be, and should it be alloc'd? Lets try the
4345          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4346          * until we get into jumbo grams and such..
4347          */
4348         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4349         int got_auth = 0;
4350         uint32_t auth_offset = 0, auth_len = 0;
4351         int auth_skipped = 0;
4352         int asconf_cnt = 0;
4353
4354         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4355             iphlen, *offset, length, (void *)stcb);
4356
4357         if (stcb) {
4358                 SCTP_TCB_LOCK_ASSERT(stcb);
4359         }
4360         /* validate chunk header length... */
4361         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4362                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4363                     ntohs(ch->chunk_length));
4364                 *offset = length;
4365                 return (stcb);
4366         }
4367         /*
4368          * validate the verification tag
4369          */
4370         vtag_in = ntohl(sh->v_tag);
4371
4372         if (ch->chunk_type == SCTP_INITIATION) {
4373                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4374                     ntohs(ch->chunk_length), vtag_in);
4375                 if (vtag_in != 0) {
4376                         /* protocol error- silently discard... */
4377                         SCTP_STAT_INCR(sctps_badvtag);
4378                         if (stcb != NULL) {
4379                                 SCTP_TCB_UNLOCK(stcb);
4380                         }
4381                         return (NULL);
4382                 }
4383         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4384                 /*
4385                  * If there is no stcb, skip the AUTH chunk and process
4386                  * later after a stcb is found (to validate the lookup was
4387                  * valid.
4388                  */
4389                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4390                     (stcb == NULL) &&
4391                     (inp->auth_supported == 1)) {
4392                         /* save this chunk for later processing */
4393                         auth_skipped = 1;
4394                         auth_offset = *offset;
4395                         auth_len = ntohs(ch->chunk_length);
4396
4397                         /* (temporarily) move past this chunk */
4398                         *offset += SCTP_SIZE32(auth_len);
4399                         if (*offset >= length) {
4400                                 /* no more data left in the mbuf chain */
4401                                 *offset = length;
4402                                 return (NULL);
4403                         }
4404                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4405                             sizeof(struct sctp_chunkhdr), chunk_buf);
4406                 }
4407                 if (ch == NULL) {
4408                         /* Help */
4409                         *offset = length;
4410                         return (stcb);
4411                 }
4412                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4413                         goto process_control_chunks;
4414                 }
4415                 /*
4416                  * first check if it's an ASCONF with an unknown src addr we
4417                  * need to look inside to find the association
4418                  */
4419                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4420                         struct sctp_chunkhdr *asconf_ch = ch;
4421                         uint32_t asconf_offset = 0, asconf_len = 0;
4422
4423                         /* inp's refcount may be reduced */
4424                         SCTP_INP_INCR_REF(inp);
4425
4426                         asconf_offset = *offset;
4427                         do {
4428                                 asconf_len = ntohs(asconf_ch->chunk_length);
4429                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4430                                         break;
4431                                 stcb = sctp_findassociation_ep_asconf(m,
4432                                     *offset,
4433                                     dst,
4434                                     sh, &inp, netp, vrf_id);
4435                                 if (stcb != NULL)
4436                                         break;
4437                                 asconf_offset += SCTP_SIZE32(asconf_len);
4438                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4439                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4440                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4441                         if (stcb == NULL) {
4442                                 /*
4443                                  * reduce inp's refcount if not reduced in
4444                                  * sctp_findassociation_ep_asconf().
4445                                  */
4446                                 SCTP_INP_DECR_REF(inp);
4447                         }
4448
4449                         /* now go back and verify any auth chunk to be sure */
4450                         if (auth_skipped && (stcb != NULL)) {
4451                                 struct sctp_auth_chunk *auth;
4452
4453                                 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) {
4454                                         auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, chunk_buf);
4455                                         got_auth = 1;
4456                                         auth_skipped = 0;
4457                                 } else {
4458                                         auth = NULL;
4459                                 }
4460                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4461                                     auth_offset)) {
4462                                         /* auth HMAC failed so dump it */
4463                                         *offset = length;
4464                                         return (stcb);
4465                                 } else {
4466                                         /* remaining chunks are HMAC checked */
4467                                         stcb->asoc.authenticated = 1;
4468                                 }
4469                         }
4470                 }
4471                 if (stcb == NULL) {
4472                         SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4473                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4474                             msg);
4475                         /* no association, so it's out of the blue... */
4476                         sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
4477                             mflowtype, mflowid, inp->fibnum,
4478                             vrf_id, port);
4479                         *offset = length;
4480                         return (NULL);
4481                 }
4482                 asoc = &stcb->asoc;
4483                 /* ABORT and SHUTDOWN can use either v_tag... */
4484                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4485                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4486                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4487                         /* Take the T-bit always into account. */
4488                         if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
4489                             (vtag_in == asoc->my_vtag)) ||
4490                             (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
4491                             (asoc->peer_vtag != htonl(0)) &&
4492                             (vtag_in == asoc->peer_vtag))) {
4493                                 /* this is valid */
4494                         } else {
4495                                 /* drop this packet... */
4496                                 SCTP_STAT_INCR(sctps_badvtag);
4497                                 if (stcb != NULL) {
4498                                         SCTP_TCB_UNLOCK(stcb);
4499                                 }
4500                                 return (NULL);
4501                         }
4502                 } else {
4503                         /* for all other chunks, vtag must match */
4504                         if (vtag_in != asoc->my_vtag) {
4505                                 /* invalid vtag... */
4506                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4507                                     "invalid vtag: %xh, expect %xh\n",
4508                                     vtag_in, asoc->my_vtag);
4509                                 SCTP_STAT_INCR(sctps_badvtag);
4510                                 if (stcb != NULL) {
4511                                         SCTP_TCB_UNLOCK(stcb);
4512                                 }
4513                                 *offset = length;
4514                                 return (NULL);
4515                         }
4516                 }
4517         }                       /* end if !SCTP_COOKIE_ECHO */
4518         /*
4519          * process all control chunks...
4520          */
4521         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4522             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4523             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4524             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
4525                 /* implied cookie-ack.. we must have lost the ack */
4526                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4527                     *netp);
4528         }
4529
4530 process_control_chunks:
4531         while (IS_SCTP_CONTROL(ch)) {
4532                 /* validate chunk length */
4533                 chk_length = ntohs(ch->chunk_length);
4534                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4535                     ch->chunk_type, chk_length);
4536                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4537                 if (chk_length < sizeof(*ch) ||
4538                     (*offset + (int)chk_length) > length) {
4539                         *offset = length;
4540                         return (stcb);
4541                 }
4542                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4543                 /*
4544                  * INIT and INIT-ACK only gets the init ack "header" portion
4545                  * only because we don't have to process the peer's COOKIE.
4546                  * All others get a complete chunk.
4547                  */
4548                 switch (ch->chunk_type) {
4549                 case SCTP_INITIATION:
4550                         contiguous = sizeof(struct sctp_init_chunk);
4551                         break;
4552                 case SCTP_INITIATION_ACK:
4553                         contiguous = sizeof(struct sctp_init_ack_chunk);
4554                         break;
4555                 default:
4556                         contiguous = min(chk_length, sizeof(chunk_buf));
4557                         break;
4558                 }
4559                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4560                     contiguous,
4561                     chunk_buf);
4562                 if (ch == NULL) {
4563                         *offset = length;
4564                         return (stcb);
4565                 }
4566
4567                 num_chunks++;
4568                 /* Save off the last place we got a control from */
4569                 if (stcb != NULL) {
4570                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4571                                 /*
4572                                  * allow last_control to be NULL if
4573                                  * ASCONF... ASCONF processing will find the
4574                                  * right net later
4575                                  */
4576                                 if ((netp != NULL) && (*netp != NULL))
4577                                         stcb->asoc.last_control_chunk_from = *netp;
4578                         }
4579                 }
4580 #ifdef SCTP_AUDITING_ENABLED
4581                 sctp_audit_log(0xB0, ch->chunk_type);
4582 #endif
4583
4584                 /* check to see if this chunk required auth, but isn't */
4585                 if ((stcb != NULL) &&
4586                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4587                     !stcb->asoc.authenticated) {
4588                         /* "silently" ignore */
4589                         SCTP_STAT_INCR(sctps_recvauthmissing);
4590                         goto next_chunk;
4591                 }
4592                 switch (ch->chunk_type) {
4593                 case SCTP_INITIATION:
4594                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4595                         /* The INIT chunk must be the only chunk. */
4596                         if ((num_chunks > 1) ||
4597                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4598                                 /*
4599                                  * RFC 4960bis requires stopping the
4600                                  * processing of the packet.
4601                                  */
4602                                 *offset = length;
4603                                 return (stcb);
4604                         }
4605                         /* Honor our resource limit. */
4606                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4607                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4608                                 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
4609                                     mflowtype, mflowid, inp->fibnum,
4610                                     vrf_id, port);
4611                                 *offset = length;
4612                                 if (stcb != NULL) {
4613                                         SCTP_TCB_UNLOCK(stcb);
4614                                 }
4615                                 return (NULL);
4616                         }
4617                         sctp_handle_init(m, iphlen, *offset, src, dst, sh,
4618                             (struct sctp_init_chunk *)ch, inp,
4619                             stcb, *netp,
4620                             mflowtype, mflowid,
4621                             vrf_id, port);
4622                         *offset = length;
4623                         if (stcb != NULL) {
4624                                 SCTP_TCB_UNLOCK(stcb);
4625                         }
4626                         return (NULL);
4627                         break;
4628                 case SCTP_PAD_CHUNK:
4629                         break;
4630                 case SCTP_INITIATION_ACK:
4631                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n");
4632                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4633                                 /* We are not interested anymore */
4634                                 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) {
4635                                         ;
4636                                 } else {
4637                                         *offset = length;
4638                                         if (stcb != NULL) {
4639                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
4640                                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
4641                                         }
4642                                         return (NULL);
4643                                 }
4644                         }
4645                         /* The INIT-ACK chunk must be the only chunk. */
4646                         if ((num_chunks > 1) ||
4647                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4648                                 *offset = length;
4649                                 return (stcb);
4650                         }
4651                         if ((netp != NULL) && (*netp != NULL)) {
4652                                 ret = sctp_handle_init_ack(m, iphlen, *offset,
4653                                     src, dst, sh,
4654                                     (struct sctp_init_ack_chunk *)ch,
4655                                     stcb, *netp,
4656                                     &abort_no_unlock,
4657                                     mflowtype, mflowid,
4658                                     vrf_id);
4659                         } else {
4660                                 ret = -1;
4661                         }
4662                         *offset = length;
4663                         if (abort_no_unlock) {
4664                                 return (NULL);
4665                         }
4666                         /*
4667                          * Special case, I must call the output routine to
4668                          * get the cookie echoed
4669                          */
4670                         if ((stcb != NULL) && (ret == 0)) {
4671                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4672                         }
4673                         return (stcb);
4674                         break;
4675                 case SCTP_SELECTIVE_ACK:
4676                 case SCTP_NR_SELECTIVE_ACK:
4677                         {
4678                                 int abort_now = 0;
4679                                 uint32_t a_rwnd, cum_ack;
4680                                 uint16_t num_seg, num_nr_seg, num_dup;
4681                                 uint8_t flags;
4682                                 int offset_seg, offset_dup;
4683
4684                                 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n",
4685                                     ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK");
4686                                 SCTP_STAT_INCR(sctps_recvsacks);
4687                                 if (stcb == NULL) {
4688                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n",
4689                                             (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK");
4690                                         break;
4691                                 }
4692                                 if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
4693                                         if (chk_length < sizeof(struct sctp_sack_chunk)) {
4694                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4695                                                 break;
4696                                         }
4697                                 } else {
4698                                         if (stcb->asoc.nrsack_supported == 0) {
4699                                                 goto unknown_chunk;
4700                                         }
4701                                         if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
4702                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n");
4703                                                 break;
4704                                         }
4705                                 }
4706                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4707                                         /*-
4708                                          * If we have sent a shutdown-ack, we will pay no
4709                                          * attention to a sack sent in to us since
4710                                          * we don't care anymore.
4711                                          */
4712                                         break;
4713                                 }
4714                                 flags = ch->chunk_flags;
4715                                 if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
4716                                         struct sctp_sack_chunk *sack;
4717
4718                                         sack = (struct sctp_sack_chunk *)ch;
4719                                         cum_ack = ntohl(sack->sack.cum_tsn_ack);
4720                                         num_seg = ntohs(sack->sack.num_gap_ack_blks);
4721                                         num_nr_seg = 0;
4722                                         num_dup = ntohs(sack->sack.num_dup_tsns);
4723                                         a_rwnd = ntohl(sack->sack.a_rwnd);
4724                                         if (sizeof(struct sctp_sack_chunk) +
4725                                             num_seg * sizeof(struct sctp_gap_ack_block) +
4726                                             num_dup * sizeof(uint32_t) != chk_length) {
4727                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4728                                                 break;
4729                                         }
4730                                         offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4731                                         offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4732                                 } else {
4733                                         struct sctp_nr_sack_chunk *nr_sack;
4734
4735                                         nr_sack = (struct sctp_nr_sack_chunk *)ch;
4736                                         cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
4737                                         num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
4738                                         num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
4739                                         num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
4740                                         a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd);
4741                                         if (sizeof(struct sctp_nr_sack_chunk) +
4742                                             (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
4743                                             num_dup * sizeof(uint32_t) != chk_length) {
4744                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
4745                                                 break;
4746                                         }
4747                                         offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
4748                                         offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block);
4749                                 }
4750                                 SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4751                                     (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK",
4752                                     cum_ack, num_seg, a_rwnd);
4753                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4754                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4755                                     (num_seg == 0) && (num_nr_seg == 0) &&
4756                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4757                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4758                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4759                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
4760                                         /*
4761                                          * We have a SIMPLE sack having no
4762                                          * prior segments and data on sent
4763                                          * queue to be acked. Use the faster
4764                                          * path sack processing. We also
4765                                          * allow window update sacks with no
4766                                          * missing segments to go this way
4767                                          * too.
4768                                          */
4769                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
4770                                             &abort_now, ecne_seen);
4771                                 } else {
4772                                         if ((netp != NULL) && (*netp != NULL)) {
4773                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4774                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
4775                                                     cum_ack, a_rwnd, ecne_seen);
4776                                         }
4777                                 }
4778                                 if (abort_now) {
4779                                         /* ABORT signal from sack processing */
4780                                         *offset = length;
4781                                         return (NULL);
4782                                 }
4783                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4784                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4785                                     (stcb->asoc.stream_queue_cnt == 0)) {
4786                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4787                                 }
4788                                 break;
4789                         }
4790                 case SCTP_HEARTBEAT_REQUEST:
4791                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
4792                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
4793                                 SCTP_STAT_INCR(sctps_recvheartbeat);
4794                                 sctp_send_heartbeat_ack(stcb, m, *offset,
4795                                     chk_length, *netp);
4796                         }
4797                         break;
4798                 case SCTP_HEARTBEAT_ACK:
4799                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n");
4800                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
4801                                 /* Its not ours */
4802                                 break;
4803                         }
4804                         SCTP_STAT_INCR(sctps_recvheartbeatack);
4805                         if ((netp != NULL) && (*netp != NULL)) {
4806                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
4807                                     stcb, *netp);
4808                         }
4809                         break;
4810                 case SCTP_ABORT_ASSOCIATION:
4811                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
4812                             (void *)stcb);
4813                         *offset = length;
4814                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
4815                                 if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) {
4816                                         return (NULL);
4817                                 } else {
4818                                         return (stcb);
4819                                 }
4820                         } else {
4821                                 return (NULL);
4822                         }
4823                         break;
4824                 case SCTP_SHUTDOWN:
4825                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
4826                             (void *)stcb);
4827                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
4828                                 break;
4829                         }
4830                         if ((netp != NULL) && (*netp != NULL)) {
4831                                 abort_flag = 0;
4832                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
4833                                     stcb, *netp, &abort_flag);
4834                                 if (abort_flag) {
4835                                         *offset = length;
4836                                         return (NULL);
4837                                 }
4838                         }
4839                         break;
4840                 case SCTP_SHUTDOWN_ACK:
4841                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb);
4842                         if ((chk_length == sizeof(struct sctp_shutdown_ack_chunk)) &&
4843                             (stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
4844                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
4845                                 *offset = length;
4846                                 return (NULL);
4847                         }
4848                         break;
4849                 case SCTP_OPERATION_ERROR:
4850                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n");
4851                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) &&
4852                             sctp_handle_error(ch, stcb, *netp, contiguous) < 0) {
4853                                 *offset = length;
4854                                 return (NULL);
4855                         }
4856                         break;
4857                 case SCTP_COOKIE_ECHO:
4858                         SCTPDBG(SCTP_DEBUG_INPUT3,
4859                             "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb);
4860                         if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) {
4861                                 ;
4862                         } else {
4863                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4864                                         /* We are not interested anymore */
4865                         abend:
4866                                         if (stcb != NULL) {
4867                                                 SCTP_TCB_UNLOCK(stcb);
4868                                         }
4869                                         *offset = length;
4870                                         return (NULL);
4871                                 }
4872                         }
4873                         /*-
4874                          * First are we accepting? We do this again here
4875                          * since it is possible that a previous endpoint WAS
4876                          * listening responded to a INIT-ACK and then
4877                          * closed. We opened and bound.. and are now no
4878                          * longer listening.
4879                          *
4880                          * XXXGL: notes on checking listen queue length.
4881                          * 1) SCTP_IS_LISTENING() doesn't necessarily mean
4882                          *    SOLISTENING(), because a listening "UDP type"
4883                          *    socket isn't listening in terms of the socket
4884                          *    layer.  It is a normal data flow socket, that
4885                          *    can fork off new connections.  Thus, we should
4886                          *    look into sol_qlen only in case we are !UDP.
4887                          * 2) Checking sol_qlen in general requires locking
4888                          *    the socket, and this code lacks that.
4889                          */
4890                         if ((stcb == NULL) &&
4891                             (!SCTP_IS_LISTENING(inp) ||
4892                             (((inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) == 0) &&
4893                             inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) {
4894                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
4895                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
4896                                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4897                                         sctp_abort_association(inp, stcb, m, iphlen,
4898                                             src, dst, sh, op_err,
4899                                             mflowtype, mflowid,
4900                                             vrf_id, port);
4901                                 }
4902                                 *offset = length;
4903                                 return (NULL);
4904                         } else {
4905                                 struct mbuf *ret_buf;
4906                                 struct sctp_inpcb *linp;
4907                                 struct sctp_tmit_chunk *chk;
4908
4909                                 if (inp->sctp_flags & (SCTP_PCB_FLAGS_SOCKET_GONE |
4910                                     SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
4911                                         goto abend;
4912                                 }
4913
4914                                 if (stcb) {
4915                                         linp = NULL;
4916                                 } else {
4917                                         linp = inp;
4918                                 }
4919
4920                                 if (linp != NULL) {
4921                                         SCTP_ASOC_CREATE_LOCK(linp);
4922                                 }
4923
4924                                 if (netp != NULL) {
4925                                         struct sctp_tcb *locked_stcb;
4926
4927                                         locked_stcb = stcb;
4928                                         ret_buf =
4929                                             sctp_handle_cookie_echo(m, iphlen,
4930                                             *offset,
4931                                             src, dst,
4932                                             sh,
4933                                             (struct sctp_cookie_echo_chunk *)ch,
4934                                             &inp, &stcb, netp,
4935                                             auth_skipped,
4936                                             auth_offset,
4937                                             auth_len,
4938                                             &locked_stcb,
4939                                             mflowtype,
4940                                             mflowid,
4941                                             vrf_id,
4942                                             port);
4943                                         if ((locked_stcb != NULL) && (locked_stcb != stcb)) {
4944                                                 SCTP_TCB_UNLOCK(locked_stcb);
4945                                         }
4946                                         if (stcb != NULL) {
4947                                                 SCTP_TCB_LOCK_ASSERT(stcb);
4948                                         }
4949                                 } else {
4950                                         ret_buf = NULL;
4951                                 }
4952                                 if (linp != NULL) {
4953                                         SCTP_ASOC_CREATE_UNLOCK(linp);
4954                                 }
4955                                 if (ret_buf == NULL) {
4956                                         if (stcb != NULL) {
4957                                                 SCTP_TCB_UNLOCK(stcb);
4958                                         }
4959                                         SCTPDBG(SCTP_DEBUG_INPUT3,
4960                                             "GAK, null buffer\n");
4961                                         *offset = length;
4962                                         return (NULL);
4963                                 }
4964                                 /* if AUTH skipped, see if it verified... */
4965                                 if (auth_skipped) {
4966                                         got_auth = 1;
4967                                         auth_skipped = 0;
4968                                 }
4969                                 /* Restart the timer if we have pending data */
4970                                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
4971                                         if (chk->whoTo != NULL) {
4972                                                 break;
4973                                         }
4974                                 }
4975                                 if (chk != NULL) {
4976                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
4977                                 }
4978                         }
4979                         break;
4980                 case SCTP_COOKIE_ACK:
4981                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb);
4982                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
4983                                 break;
4984                         }
4985                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4986                                 /* We are not interested anymore */
4987                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4988                                         ;
4989                                 } else if (stcb) {
4990                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
4991                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
4992                                         *offset = length;
4993                                         return (NULL);
4994                                 }
4995                         }
4996                         if ((netp != NULL) && (*netp != NULL)) {
4997                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
4998                         }
4999                         break;
5000                 case SCTP_ECN_ECHO:
5001                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n");
5002                         if (stcb == NULL) {
5003                                 break;
5004                         }
5005                         if (stcb->asoc.ecn_supported == 0) {
5006                                 goto unknown_chunk;
5007                         }
5008                         if ((chk_length != sizeof(struct sctp_ecne_chunk)) &&
5009                             (chk_length != sizeof(struct old_sctp_ecne_chunk))) {
5010                                 break;
5011                         }
5012                         sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb);
5013                         ecne_seen = 1;
5014                         break;
5015                 case SCTP_ECN_CWR:
5016                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n");
5017                         if (stcb == NULL) {
5018                                 break;
5019                         }
5020                         if (stcb->asoc.ecn_supported == 0) {
5021                                 goto unknown_chunk;
5022                         }
5023                         if (chk_length != sizeof(struct sctp_cwr_chunk)) {
5024                                 break;
5025                         }
5026                         sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5027                         break;
5028                 case SCTP_SHUTDOWN_COMPLETE:
5029                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb);
5030                         /* must be first and only chunk */
5031                         if ((num_chunks > 1) ||
5032                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5033                                 *offset = length;
5034                                 return (stcb);
5035                         }
5036                         if ((chk_length == sizeof(struct sctp_shutdown_complete_chunk)) &&
5037                             (stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5038                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5039                                     stcb, *netp);
5040                                 *offset = length;
5041                                 return (NULL);
5042                         }
5043                         break;
5044                 case SCTP_ASCONF:
5045                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5046                         if (stcb != NULL) {
5047                                 if (stcb->asoc.asconf_supported == 0) {
5048                                         goto unknown_chunk;
5049                                 }
5050                                 sctp_handle_asconf(m, *offset, src,
5051                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5052                                 asconf_cnt++;
5053                         }
5054                         break;
5055                 case SCTP_ASCONF_ACK:
5056                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n");
5057                         if (stcb == NULL) {
5058                                 break;
5059                         }
5060                         if (stcb->asoc.asconf_supported == 0) {
5061                                 goto unknown_chunk;
5062                         }
5063                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5064                                 break;
5065                         }
5066                         if ((netp != NULL) && (*netp != NULL)) {
5067                                 /* He's alive so give him credit */
5068                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5069                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5070                                             stcb->asoc.overall_error_count,
5071                                             0,
5072                                             SCTP_FROM_SCTP_INPUT,
5073                                             __LINE__);
5074                                 }
5075                                 stcb->asoc.overall_error_count = 0;
5076                                 sctp_handle_asconf_ack(m, *offset,
5077                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5078                                 if (abort_no_unlock)
5079                                         return (NULL);
5080                         }
5081                         break;
5082                 case SCTP_FORWARD_CUM_TSN:
5083                 case SCTP_IFORWARD_CUM_TSN:
5084                         SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n",
5085                             ch->chunk_type == SCTP_FORWARD_CUM_TSN ? "FORWARD_TSN" : "I_FORWARD_TSN");
5086                         if (stcb == NULL) {
5087                                 break;
5088                         }
5089                         if (stcb->asoc.prsctp_supported == 0) {
5090                                 goto unknown_chunk;
5091                         }
5092                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5093                                 break;
5094                         }
5095                         if (((stcb->asoc.idata_supported == 1) && (ch->chunk_type == SCTP_FORWARD_CUM_TSN)) ||
5096                             ((stcb->asoc.idata_supported == 0) && (ch->chunk_type == SCTP_IFORWARD_CUM_TSN))) {
5097                                 if (ch->chunk_type == SCTP_FORWARD_CUM_TSN) {
5098                                         SCTP_SNPRINTF(msg, sizeof(msg), "%s", "FORWARD-TSN chunk received when I-FORWARD-TSN was negotiated");
5099                                 } else {
5100                                         SCTP_SNPRINTF(msg, sizeof(msg), "%s", "I-FORWARD-TSN chunk received when FORWARD-TSN was negotiated");
5101                                 }
5102                                 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
5103                                 sctp_abort_an_association(inp, stcb, op_err, false, SCTP_SO_NOT_LOCKED);
5104                                 *offset = length;
5105                                 return (NULL);
5106                         }
5107                         *fwd_tsn_seen = 1;
5108                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5109                                 /* We are not interested anymore */
5110                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5111                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_31);
5112                                 *offset = length;
5113                                 return (NULL);
5114                         }
5115                         /*
5116                          * For sending a SACK this looks like DATA chunks.
5117                          */
5118                         stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from;
5119                         abort_flag = 0;
5120                         sctp_handle_forward_tsn(stcb,
5121                             (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5122                         if (abort_flag) {
5123                                 *offset = length;
5124                                 return (NULL);
5125                         }
5126                         break;
5127                 case SCTP_STREAM_RESET:
5128                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5129                         if (stcb == NULL) {
5130                                 break;
5131                         }
5132                         if (stcb->asoc.reconfig_supported == 0) {
5133                                 goto unknown_chunk;
5134                         }
5135                         if (chk_length < sizeof(struct sctp_stream_reset_tsn_req)) {
5136                                 break;
5137                         }
5138                         if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5139                                 /* stop processing */
5140                                 *offset = length;
5141                                 return (NULL);
5142                         }
5143                         break;
5144                 case SCTP_PACKET_DROPPED:
5145                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5146                         if (stcb == NULL) {
5147                                 break;
5148                         }
5149                         if (stcb->asoc.pktdrop_supported == 0) {
5150                                 goto unknown_chunk;
5151                         }
5152                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5153                                 break;
5154                         }
5155                         if ((netp != NULL) && (*netp != NULL)) {
5156                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5157                                     stcb, *netp,
5158                                     min(chk_length, contiguous));
5159                         }
5160                         break;
5161                 case SCTP_AUTHENTICATION:
5162                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5163                         if (stcb == NULL) {
5164                                 /* save the first AUTH for later processing */
5165                                 if (auth_skipped == 0) {
5166                                         auth_offset = *offset;
5167                                         auth_len = chk_length;
5168                                         auth_skipped = 1;
5169                                 }
5170                                 /* skip this chunk (temporarily) */
5171                                 break;
5172                         }
5173                         if (stcb->asoc.auth_supported == 0) {
5174                                 goto unknown_chunk;
5175                         }
5176                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5177                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5178                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5179                                 /* Its not ours */
5180                                 *offset = length;
5181                                 return (stcb);
5182                         }
5183                         if (got_auth == 1) {
5184                                 /* skip this chunk... it's already auth'd */
5185                                 break;
5186                         }
5187                         got_auth = 1;
5188                         if (sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, m, *offset)) {
5189                                 /* auth HMAC failed so dump the packet */
5190                                 *offset = length;
5191                                 return (stcb);
5192                         } else {
5193                                 /* remaining chunks are HMAC checked */
5194                                 stcb->asoc.authenticated = 1;
5195                         }
5196                         break;
5197
5198                 default:
5199         unknown_chunk:
5200                         /* it's an unknown chunk! */
5201                         if ((ch->chunk_type & 0x40) &&
5202                             (stcb != NULL) &&
5203                             (SCTP_GET_STATE(stcb) != SCTP_STATE_EMPTY) &&
5204                             (SCTP_GET_STATE(stcb) != SCTP_STATE_INUSE) &&
5205                             (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) {
5206                                 struct sctp_gen_error_cause *cause;
5207                                 int len;
5208
5209                                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause),
5210                                     0, M_NOWAIT, 1, MT_DATA);
5211                                 if (op_err != NULL) {
5212                                         len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset));
5213                                         cause = mtod(op_err, struct sctp_gen_error_cause *);
5214                                         cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5215                                         cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause)));
5216                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5217                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
5218                                         if (SCTP_BUF_NEXT(op_err) != NULL) {
5219 #ifdef SCTP_MBUF_LOGGING
5220                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5221                                                         sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY);
5222                                                 }
5223 #endif
5224                                                 sctp_queue_op_err(stcb, op_err);
5225                                         } else {
5226                                                 sctp_m_freem(op_err);
5227                                         }
5228                                 }
5229                         }
5230                         if ((ch->chunk_type & 0x80) == 0) {
5231                                 /* discard this packet */
5232                                 *offset = length;
5233                                 return (stcb);
5234                         }       /* else skip this bad chunk and continue... */
5235                         break;
5236                 }               /* switch (ch->chunk_type) */
5237
5238 next_chunk:
5239                 /* get the next chunk */
5240                 *offset += SCTP_SIZE32(chk_length);
5241                 if (*offset >= length) {
5242                         /* no more data left in the mbuf chain */
5243                         break;
5244                 }
5245                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5246                     sizeof(struct sctp_chunkhdr), chunk_buf);
5247                 if (ch == NULL) {
5248                         *offset = length;
5249                         return (stcb);
5250                 }
5251         }                       /* while */
5252
5253         if ((asconf_cnt > 0) && (stcb != NULL)) {
5254                 sctp_send_asconf_ack(stcb);
5255         }
5256         return (stcb);
5257 }
5258
5259 /*
5260  * common input chunk processing (v4 and v6)
5261  */
5262 void
5263 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5264     struct sockaddr *src, struct sockaddr *dst,
5265     struct sctphdr *sh, struct sctp_chunkhdr *ch,
5266     uint8_t compute_crc,
5267     uint8_t ecn_bits,
5268     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
5269     uint32_t vrf_id, uint16_t port)
5270 {
5271         char msg[SCTP_DIAG_INFO_LEN];
5272         struct mbuf *m = *mm, *op_err;
5273         struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5274         struct sctp_tcb *stcb = NULL;
5275         struct sctp_nets *net = NULL;
5276         uint32_t high_tsn;
5277         uint32_t cksum_in_hdr;
5278         int un_sent;
5279         int cnt_ctrl_ready = 0;
5280         int fwd_tsn_seen = 0, data_processed = 0;
5281         bool cksum_validated, stcb_looked_up;
5282
5283         SCTP_STAT_INCR(sctps_recvdatagrams);
5284 #ifdef SCTP_AUDITING_ENABLED
5285         sctp_audit_log(0xE0, 1);
5286         sctp_auditing(0, inp, stcb, net);
5287 #endif
5288
5289         stcb_looked_up = false;
5290         if (compute_crc != 0) {
5291                 cksum_validated = false;
5292                 cksum_in_hdr = sh->checksum;
5293                 if (cksum_in_hdr != htonl(0)) {
5294                         uint32_t cksum_calculated;
5295
5296         validate_cksum:
5297                         sh->checksum = 0;
5298                         cksum_calculated = sctp_calculate_cksum(m, iphlen);
5299                         sh->checksum = cksum_in_hdr;
5300                         if (cksum_calculated != cksum_in_hdr) {
5301                                 if (stcb_looked_up) {
5302                                         /*
5303                                          * The packet has a zero checksum,
5304                                          * which is not the correct CRC, no
5305                                          * stcb has been found or an stcb
5306                                          * has been found but an incorrect
5307                                          * zero checksum is not acceptable.
5308                                          */
5309                                         KASSERT(cksum_in_hdr == htonl(0),
5310                                             ("cksum in header not zero: %x",
5311                                             ntohl(cksum_in_hdr)));
5312                                         if ((inp == NULL) &&
5313                                             (SCTP_BASE_SYSCTL(sctp_ootb_with_zero_cksum) == 1)) {
5314                                                 /*
5315                                                  * This is an OOTB packet,
5316                                                  * depending on the sysctl
5317                                                  * variable, pretend that
5318                                                  * the checksum is
5319                                                  * acceptable, to allow an
5320                                                  * appropriate response
5321                                                  * (ABORT, for examlpe) to
5322                                                  * be sent.
5323                                                  */
5324                                                 KASSERT(stcb == NULL,
5325                                                     ("stcb is %p", stcb));
5326                                                 SCTP_STAT_INCR(sctps_recvzerocrc);
5327                                                 goto cksum_validated;
5328                                         }
5329                                 } else {
5330                                         stcb = sctp_findassociation_addr(m, offset, src, dst,
5331                                             sh, ch, &inp, &net, vrf_id);
5332                                 }
5333                                 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad cksum in SCTP packet:%x calculated:%x m:%p mlen:%d iphlen:%d\n",
5334                                     ntohl(cksum_in_hdr), ntohl(cksum_calculated), (void *)m, length, iphlen);
5335 #if defined(INET) || defined(INET6)
5336                                 if ((ch->chunk_type != SCTP_INITIATION) &&
5337                                     (net != NULL) && (net->port != port)) {
5338                                         if (net->port == 0) {
5339                                                 /*
5340                                                  * UDP encapsulation turned
5341                                                  * on.
5342                                                  */
5343                                                 net->mtu -= sizeof(struct udphdr);
5344                                                 if (stcb->asoc.smallest_mtu > net->mtu) {
5345                                                         sctp_pathmtu_adjustment(stcb, net->mtu, true);
5346                                                 }
5347                                         } else if (port == 0) {
5348                                                 /*
5349                                                  * UDP encapsulation turned
5350                                                  * off.
5351                                                  */
5352                                                 net->mtu += sizeof(struct udphdr);
5353                                                 /* XXX Update smallest_mtu */
5354                                         }
5355                                         net->port = port;
5356                                 }
5357 #endif
5358                                 if (net != NULL) {
5359                                         net->flowtype = mflowtype;
5360                                         net->flowid = mflowid;
5361                                 }
5362                                 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5363                                 if ((inp != NULL) && (stcb != NULL)) {
5364                                         if (stcb->asoc.pktdrop_supported) {
5365                                                 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5366                                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5367                                         }
5368                                 } else if ((inp != NULL) && (stcb == NULL)) {
5369                                         inp_decr = inp;
5370                                 }
5371                                 SCTP_STAT_INCR(sctps_badsum);
5372                                 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5373                                 goto out;
5374                         } else {
5375                                 cksum_validated = true;
5376                         }
5377                 }
5378                 KASSERT(cksum_validated || cksum_in_hdr == htonl(0),
5379                     ("cksum 0x%08x not zero and not validated", ntohl(cksum_in_hdr)));
5380                 if (!cksum_validated) {
5381                         stcb = sctp_findassociation_addr(m, offset, src, dst,
5382                             sh, ch, &inp, &net, vrf_id);
5383                         stcb_looked_up = true;
5384                         if (stcb == NULL) {
5385                                 goto validate_cksum;
5386                         }
5387                         if (stcb->asoc.rcv_edmid == SCTP_EDMID_NONE) {
5388                                 goto validate_cksum;
5389                         }
5390                         KASSERT(stcb->asoc.rcv_edmid == SCTP_EDMID_LOWER_LAYER_DTLS,
5391                             ("Unexpected EDMID %u", stcb->asoc.rcv_edmid));
5392                         SCTP_STAT_INCR(sctps_recvzerocrc);
5393                 }
5394         }
5395 cksum_validated:
5396         /* Destination port of 0 is illegal, based on RFC4960. */
5397         if (sh->dest_port == htons(0)) {
5398                 SCTP_STAT_INCR(sctps_hdrops);
5399                 if ((stcb == NULL) && (inp != NULL)) {
5400                         inp_decr = inp;
5401                 }
5402                 goto out;
5403         }
5404         if (!stcb_looked_up) {
5405                 stcb = sctp_findassociation_addr(m, offset, src, dst,
5406                     sh, ch, &inp, &net, vrf_id);
5407         }
5408 #if defined(INET) || defined(INET6)
5409         if ((ch->chunk_type != SCTP_INITIATION) &&
5410             (net != NULL) && (net->port != port)) {
5411                 if (net->port == 0) {
5412                         /* UDP encapsulation turned on. */
5413                         net->mtu -= sizeof(struct udphdr);
5414                         if (stcb->asoc.smallest_mtu > net->mtu) {
5415                                 sctp_pathmtu_adjustment(stcb, net->mtu, true);
5416                         }
5417                 } else if (port == 0) {
5418                         /* UDP encapsulation turned off. */
5419                         net->mtu += sizeof(struct udphdr);
5420                         /* XXX Update smallest_mtu */
5421                 }
5422                 net->port = port;
5423         }
5424 #endif
5425         if (net != NULL) {
5426                 net->flowtype = mflowtype;
5427                 net->flowid = mflowid;
5428         }
5429         if (inp == NULL) {
5430                 SCTP_STAT_INCR(sctps_noport);
5431                 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5432                 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5433                         goto out;
5434                 }
5435                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5436                         SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
5437                         sctp_send_shutdown_complete2(src, dst, sh,
5438                             mflowtype, mflowid, fibnum,
5439                             vrf_id, port);
5440                         goto out;
5441                 }
5442                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5443                         SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
5444                         goto out;
5445                 }
5446                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5447                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5448                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5449                             (ch->chunk_type != SCTP_INIT))) {
5450                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5451                                     "Out of the blue");
5452                                 sctp_send_abort(m, iphlen, src, dst,
5453                                     sh, 0, op_err,
5454                                     mflowtype, mflowid, fibnum,
5455                                     vrf_id, port);
5456                         }
5457                 }
5458                 goto out;
5459         } else if (stcb == NULL) {
5460                 inp_decr = inp;
5461         }
5462         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5463             (void *)m, iphlen, offset, length, (void *)stcb);
5464         if (stcb) {
5465                 /* always clear this before beginning a packet */
5466                 stcb->asoc.authenticated = 0;
5467                 stcb->asoc.seen_a_sack_this_pkt = 0;
5468                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5469                     (void *)stcb, stcb->asoc.state);
5470
5471                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5472                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5473                         /*-
5474                          * If we hit here, we had a ref count
5475                          * up when the assoc was aborted and the
5476                          * timer is clearing out the assoc, we should
5477                          * NOT respond to any packet.. its OOTB.
5478                          */
5479                         SCTP_TCB_UNLOCK(stcb);
5480                         stcb = NULL;
5481                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5482                         SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5483                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5484                             msg);
5485                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5486                             mflowtype, mflowid, inp->fibnum,
5487                             vrf_id, port);
5488                         goto out;
5489                 }
5490         }
5491         if (IS_SCTP_CONTROL(ch)) {
5492                 /* process the control portion of the SCTP packet */
5493                 /* sa_ignore NO_NULL_CHK */
5494                 stcb = sctp_process_control(m, iphlen, &offset, length,
5495                     src, dst, sh, ch,
5496                     inp, stcb, &net, &fwd_tsn_seen,
5497                     mflowtype, mflowid, fibnum,
5498                     vrf_id, port);
5499                 if (stcb) {
5500                         /*
5501                          * This covers us if the cookie-echo was there and
5502                          * it changes our INP.
5503                          */
5504                         inp = stcb->sctp_ep;
5505 #if defined(INET) || defined(INET6)
5506                         if ((ch->chunk_type != SCTP_INITIATION) &&
5507                             (net != NULL) && (net->port != port)) {
5508                                 if (net->port == 0) {
5509                                         /* UDP encapsulation turned on. */
5510                                         net->mtu -= sizeof(struct udphdr);
5511                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5512                                                 sctp_pathmtu_adjustment(stcb, net->mtu, true);
5513                                         }
5514                                 } else if (port == 0) {
5515                                         /* UDP encapsulation turned off. */
5516                                         net->mtu += sizeof(struct udphdr);
5517                                         /* XXX Update smallest_mtu */
5518                                 }
5519                                 net->port = port;
5520                         }
5521 #endif
5522                 }
5523         } else {
5524                 /*
5525                  * no control chunks, so pre-process DATA chunks (these
5526                  * checks are taken care of by control processing)
5527                  */
5528
5529                 /*
5530                  * if DATA only packet, and auth is required, then punt...
5531                  * can't have authenticated without any AUTH (control)
5532                  * chunks
5533                  */
5534                 if ((stcb != NULL) &&
5535                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5536                         /* "silently" ignore */
5537                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5538                         SCTP_STAT_INCR(sctps_recvauthmissing);
5539                         goto out;
5540                 }
5541                 if (stcb == NULL) {
5542                         /* out of the blue DATA chunk */
5543                         SCTP_PROBE5(receive, NULL, NULL, m, NULL, sh);
5544                         SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5545                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5546                             msg);
5547                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5548                             mflowtype, mflowid, fibnum,
5549                             vrf_id, port);
5550                         goto out;
5551                 }
5552                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5553                         /* v_tag mismatch! */
5554                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5555                         SCTP_STAT_INCR(sctps_badvtag);
5556                         goto out;
5557                 }
5558         }
5559
5560         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5561         if (stcb == NULL) {
5562                 /*
5563                  * no valid TCB for this packet, or we found it's a bad
5564                  * packet while processing control, or we're done with this
5565                  * packet (done or skip rest of data), so we drop it...
5566                  */
5567                 goto out;
5568         }
5569
5570         /*
5571          * DATA chunk processing
5572          */
5573         /* plow through the data chunks while length > offset */
5574
5575         /*
5576          * Rest should be DATA only.  Check authentication state if AUTH for
5577          * DATA is required.
5578          */
5579         if ((length > offset) &&
5580             (stcb != NULL) &&
5581             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5582             !stcb->asoc.authenticated) {
5583                 /* "silently" ignore */
5584                 SCTP_STAT_INCR(sctps_recvauthmissing);
5585                 SCTPDBG(SCTP_DEBUG_AUTH1,
5586                     "Data chunk requires AUTH, skipped\n");
5587                 goto trigger_send;
5588         }
5589         if (length > offset) {
5590                 int retval;
5591
5592                 /*
5593                  * First check to make sure our state is correct. We would
5594                  * not get here unless we really did have a tag, so we don't
5595                  * abort if this happens, just dump the chunk silently.
5596                  */
5597                 switch (SCTP_GET_STATE(stcb)) {
5598                 case SCTP_STATE_COOKIE_ECHOED:
5599                         /*
5600                          * we consider data with valid tags in this state
5601                          * shows us the cookie-ack was lost. Imply it was
5602                          * there.
5603                          */
5604                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5605                         break;
5606                 case SCTP_STATE_COOKIE_WAIT:
5607                         /*
5608                          * We consider OOTB any data sent during asoc setup.
5609                          */
5610                         SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5611                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5612                             msg);
5613                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5614                             mflowtype, mflowid, inp->fibnum,
5615                             vrf_id, port);
5616                         goto out;
5617                         /* sa_ignore NOTREACHED */
5618                         break;
5619                 case SCTP_STATE_EMPTY:  /* should not happen */
5620                 case SCTP_STATE_INUSE:  /* should not happen */
5621                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5622                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5623                 default:
5624                         goto out;
5625                         /* sa_ignore NOTREACHED */
5626                         break;
5627                 case SCTP_STATE_OPEN:
5628                 case SCTP_STATE_SHUTDOWN_SENT:
5629                         break;
5630                 }
5631                 /* plow through the data chunks while length > offset */
5632                 retval = sctp_process_data(mm, iphlen, &offset, length,
5633                     inp, stcb, net, &high_tsn);
5634                 if (retval == 2) {
5635                         /*
5636                          * The association aborted, NO UNLOCK needed since
5637                          * the association is destroyed.
5638                          */
5639                         stcb = NULL;
5640                         goto out;
5641                 }
5642                 if (retval == 0) {
5643                         data_processed = 1;
5644                 }
5645                 /*
5646                  * Anything important needs to have been m_copy'ed in
5647                  * process_data
5648                  */
5649         }
5650
5651         /* take care of ecn */
5652         if ((data_processed == 1) &&
5653             (stcb->asoc.ecn_supported == 1) &&
5654             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5655                 /* Yep, we need to add a ECNE */
5656                 sctp_send_ecn_echo(stcb, net, high_tsn);
5657         }
5658
5659         if ((data_processed == 0) && (fwd_tsn_seen)) {
5660                 int was_a_gap;
5661                 uint32_t highest_tsn;
5662
5663                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
5664                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
5665                 } else {
5666                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
5667                 }
5668                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
5669                 stcb->asoc.send_sack = 1;
5670                 sctp_sack_check(stcb, was_a_gap);
5671         } else if (fwd_tsn_seen) {
5672                 stcb->asoc.send_sack = 1;
5673         }
5674         /* trigger send of any chunks in queue... */
5675 trigger_send:
5676 #ifdef SCTP_AUDITING_ENABLED
5677         sctp_audit_log(0xE0, 2);
5678         sctp_auditing(1, inp, stcb, net);
5679 #endif
5680         SCTPDBG(SCTP_DEBUG_INPUT1,
5681             "Check for chunk output prw:%d tqe:%d tf=%d\n",
5682             stcb->asoc.peers_rwnd,
5683             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
5684             stcb->asoc.total_flight);
5685         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
5686         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
5687                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
5688         }
5689         if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) ||
5690             cnt_ctrl_ready ||
5691             stcb->asoc.trigger_reset ||
5692             ((un_sent > 0) &&
5693             (stcb->asoc.peers_rwnd > 0 || stcb->asoc.total_flight == 0))) {
5694                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
5695                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5696                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
5697         }
5698 #ifdef SCTP_AUDITING_ENABLED
5699         sctp_audit_log(0xE0, 3);
5700         sctp_auditing(2, inp, stcb, net);
5701 #endif
5702 out:
5703         if (stcb != NULL) {
5704                 SCTP_TCB_UNLOCK(stcb);
5705         }
5706         if (inp_decr != NULL) {
5707                 /* reduce ref-count */
5708                 SCTP_INP_WLOCK(inp_decr);
5709                 SCTP_INP_DECR_REF(inp_decr);
5710                 SCTP_INP_WUNLOCK(inp_decr);
5711         }
5712         return;
5713 }
5714
5715 #ifdef INET
5716 void
5717 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
5718 {
5719         struct mbuf *m;
5720         int iphlen;
5721         uint32_t vrf_id = 0;
5722         uint8_t ecn_bits;
5723         struct sockaddr_in src, dst;
5724         struct ip *ip;
5725         struct sctphdr *sh;
5726         struct sctp_chunkhdr *ch;
5727         int length, offset;
5728         uint8_t compute_crc;
5729         uint32_t mflowid;
5730         uint8_t mflowtype;
5731         uint16_t fibnum;
5732
5733         iphlen = off;
5734         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
5735                 SCTP_RELEASE_PKT(i_pak);
5736                 return;
5737         }
5738         m = SCTP_HEADER_TO_CHAIN(i_pak);
5739 #ifdef SCTP_MBUF_LOGGING
5740         /* Log in any input mbufs */
5741         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5742                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
5743         }
5744 #endif
5745 #ifdef SCTP_PACKET_LOGGING
5746         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
5747                 sctp_packet_log(m);
5748         }
5749 #endif
5750         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
5751             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
5752             m->m_pkthdr.len,
5753             if_name(m->m_pkthdr.rcvif),
5754             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
5755         mflowid = m->m_pkthdr.flowid;
5756         mflowtype = M_HASHTYPE_GET(m);
5757         fibnum = M_GETFIB(m);
5758         SCTP_STAT_INCR(sctps_recvpackets);
5759         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
5760         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
5761         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5762         if (SCTP_BUF_LEN(m) < offset) {
5763                 if ((m = m_pullup(m, offset)) == NULL) {
5764                         SCTP_STAT_INCR(sctps_hdrops);
5765                         return;
5766                 }
5767         }
5768         ip = mtod(m, struct ip *);
5769         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
5770         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
5771         offset -= sizeof(struct sctp_chunkhdr);
5772         memset(&src, 0, sizeof(struct sockaddr_in));
5773         src.sin_family = AF_INET;
5774         src.sin_len = sizeof(struct sockaddr_in);
5775         src.sin_port = sh->src_port;
5776         src.sin_addr = ip->ip_src;
5777         memset(&dst, 0, sizeof(struct sockaddr_in));
5778         dst.sin_family = AF_INET;
5779         dst.sin_len = sizeof(struct sockaddr_in);
5780         dst.sin_port = sh->dest_port;
5781         dst.sin_addr = ip->ip_dst;
5782         length = ntohs(ip->ip_len);
5783         /* Validate mbuf chain length with IP payload length. */
5784         if (SCTP_HEADER_LEN(m) != length) {
5785                 SCTPDBG(SCTP_DEBUG_INPUT1,
5786                     "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
5787                 SCTP_STAT_INCR(sctps_hdrops);
5788                 goto out;
5789         }
5790         /* SCTP does not allow broadcasts or multicasts */
5791         if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
5792                 goto out;
5793         }
5794         if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
5795                 goto out;
5796         }
5797         ecn_bits = ip->ip_tos;
5798         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
5799                 SCTP_STAT_INCR(sctps_recvhwcrc);
5800                 compute_crc = 0;
5801         } else {
5802                 SCTP_STAT_INCR(sctps_recvswcrc);
5803                 compute_crc = 1;
5804         }
5805         sctp_common_input_processing(&m, iphlen, offset, length,
5806             (struct sockaddr *)&src,
5807             (struct sockaddr *)&dst,
5808             sh, ch,
5809             compute_crc,
5810             ecn_bits,
5811             mflowtype, mflowid, fibnum,
5812             vrf_id, port);
5813 out:
5814         if (m) {
5815                 sctp_m_freem(m);
5816         }
5817         return;
5818 }
5819
5820 #if defined(SCTP_MCORE_INPUT) && defined(SMP)
5821 extern int *sctp_cpuarry;
5822 #endif
5823
5824 int
5825 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED)
5826 {
5827         struct mbuf *m;
5828         int off;
5829
5830         m = *mp;
5831         off = *offp;
5832 #if defined(SCTP_MCORE_INPUT) && defined(SMP)
5833         if (mp_ncpus > 1) {
5834                 struct ip *ip;
5835                 struct sctphdr *sh;
5836                 int offset;
5837                 int cpu_to_use;
5838                 uint32_t flowid, tag;
5839
5840                 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
5841                         flowid = m->m_pkthdr.flowid;
5842                 } else {
5843                         /*
5844                          * No flow id built by lower layers fix it so we
5845                          * create one.
5846                          */
5847                         offset = off + sizeof(struct sctphdr);
5848                         if (SCTP_BUF_LEN(m) < offset) {
5849                                 if ((m = m_pullup(m, offset)) == NULL) {
5850                                         SCTP_STAT_INCR(sctps_hdrops);
5851                                         return (IPPROTO_DONE);
5852                                 }
5853                         }
5854                         ip = mtod(m, struct ip *);
5855                         sh = (struct sctphdr *)((caddr_t)ip + off);
5856                         tag = htonl(sh->v_tag);
5857                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
5858                         m->m_pkthdr.flowid = flowid;
5859                         M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH);
5860                 }
5861                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
5862                 sctp_queue_to_mcore(m, off, cpu_to_use);
5863                 return (IPPROTO_DONE);
5864         }
5865 #endif
5866         sctp_input_with_port(m, off, 0);
5867         return (IPPROTO_DONE);
5868 }
5869 #endif