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