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