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                         inp->inp_starting_point_for_iterator = NULL;
2690                         /*
2691                          * copy in the authentication parameters from the
2692                          * original endpoint
2693                          */
2694                         if (inp->sctp_ep.local_hmacs)
2695                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2696                         inp->sctp_ep.local_hmacs =
2697                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2698                         if (inp->sctp_ep.local_auth_chunks)
2699                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2700                         inp->sctp_ep.local_auth_chunks =
2701                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2702
2703                         /*
2704                          * Now we must move it from one hash table to
2705                          * another and get the tcb in the right place.
2706                          */
2707
2708                         /*
2709                          * This is where the one-2-one socket is put into
2710                          * the accept state waiting for the accept!
2711                          */
2712                         if (*stcb) {
2713                                 SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE);
2714                         }
2715                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2716
2717                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2718                         SCTP_TCB_UNLOCK((*stcb));
2719
2720                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2721                             0);
2722                         SCTP_TCB_LOCK((*stcb));
2723                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2724
2725                         /*
2726                          * now we must check to see if we were aborted while
2727                          * the move was going on and the lock/unlock
2728                          * happened.
2729                          */
2730                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2731                                 /*
2732                                  * yep it was, we leave the assoc attached
2733                                  * to the socket since the sctp_inpcb_free()
2734                                  * call will send an abort for us.
2735                                  */
2736                                 SCTP_INP_DECR_REF(inp);
2737                                 return (NULL);
2738                         }
2739                         SCTP_INP_DECR_REF(inp);
2740                         /* Switch over to the new guy */
2741                         *inp_p = inp;
2742                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2743                         if (send_int_conf) {
2744                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2745                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2746                         }
2747
2748                         /*
2749                          * Pull it from the incomplete queue and wake the
2750                          * guy
2751                          */
2752                         soisconnected(so);
2753                         return (m);
2754                 }
2755         }
2756         if (notification) {
2757                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2758         }
2759         if (send_int_conf) {
2760                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2761                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2762         }
2763         return (m);
2764 }
2765
2766 static void
2767 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2768     struct sctp_tcb *stcb, struct sctp_nets *net)
2769 {
2770         /* cp must not be used, others call this without a c-ack :-) */
2771         struct sctp_association *asoc;
2772         struct sctp_tmit_chunk *chk;
2773
2774         SCTPDBG(SCTP_DEBUG_INPUT2,
2775             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2776         if ((stcb == NULL) || (net == NULL)) {
2777                 return;
2778         }
2779
2780         asoc = &stcb->asoc;
2781         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
2782                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
2783                     asoc->overall_error_count,
2784                     0,
2785                     SCTP_FROM_SCTP_INPUT,
2786                     __LINE__);
2787         }
2788         asoc->overall_error_count = 0;
2789         sctp_stop_all_cookie_timers(stcb);
2790         /* process according to association state */
2791         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) {
2792                 /* state change only needed when I am in right state */
2793                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2794                 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
2795                 sctp_start_net_timers(stcb);
2796                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2797                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2798                             stcb->sctp_ep, stcb, NULL);
2799                 }
2800                 /* update RTO */
2801                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2802                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2803                 if (asoc->overall_error_count == 0) {
2804                         sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered,
2805                             SCTP_RTT_FROM_NON_DATA);
2806                 }
2807                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2808                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2809                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2810                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2811                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2812                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
2813                                 soisconnected(stcb->sctp_socket);
2814                         }
2815                 }
2816                 /*
2817                  * since we did not send a HB make sure we don't double
2818                  * things
2819                  */
2820                 net->hb_responded = 1;
2821
2822                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2823                         /*
2824                          * We don't need to do the asconf thing, nor hb or
2825                          * autoclose if the socket is closed.
2826                          */
2827                         goto closed_socket;
2828                 }
2829
2830                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2831                     stcb, net);
2832
2833                 if (stcb->asoc.sctp_autoclose_ticks &&
2834                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2835                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2836                             stcb->sctp_ep, stcb, NULL);
2837                 }
2838                 /*
2839                  * send ASCONF if parameters are pending and ASCONFs are
2840                  * allowed (eg. addresses changed when init/cookie echo were
2841                  * in flight)
2842                  */
2843                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2844                     (stcb->asoc.asconf_supported == 1) &&
2845                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2846 #ifdef SCTP_TIMER_BASED_ASCONF
2847                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2848                             stcb->sctp_ep, stcb,
2849                             stcb->asoc.primary_destination);
2850 #else
2851                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2852                             SCTP_ADDR_NOT_LOCKED);
2853 #endif
2854                 }
2855         }
2856 closed_socket:
2857         /* Toss the cookie if I can */
2858         sctp_toss_old_cookies(stcb, asoc);
2859         /* Restart the timer if we have pending data */
2860         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
2861                 if (chk->whoTo != NULL) {
2862                         break;
2863                 }
2864         }
2865         if (chk != NULL) {
2866                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
2867         }
2868 }
2869
2870 static void
2871 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
2872     struct sctp_tcb *stcb)
2873 {
2874         struct sctp_nets *net;
2875         struct sctp_tmit_chunk *lchk;
2876         struct sctp_ecne_chunk bkup;
2877         uint8_t override_bit;
2878         uint32_t tsn, window_data_tsn;
2879         int len;
2880         unsigned int pkt_cnt;
2881
2882         len = ntohs(cp->ch.chunk_length);
2883         if (len == sizeof(struct old_sctp_ecne_chunk)) {
2884                 /* Its the old format */
2885                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
2886                 bkup.num_pkts_since_cwr = htonl(1);
2887                 cp = &bkup;
2888         }
2889         SCTP_STAT_INCR(sctps_recvecne);
2890         tsn = ntohl(cp->tsn);
2891         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
2892         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
2893         if (lchk == NULL) {
2894                 window_data_tsn = stcb->asoc.sending_seq - 1;
2895         } else {
2896                 window_data_tsn = lchk->rec.data.tsn;
2897         }
2898
2899         /* Find where it was sent to if possible. */
2900         net = NULL;
2901         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
2902                 if (lchk->rec.data.tsn == tsn) {
2903                         net = lchk->whoTo;
2904                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
2905                         break;
2906                 }
2907                 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) {
2908                         break;
2909                 }
2910         }
2911         if (net == NULL) {
2912                 /*
2913                  * What to do. A previous send of a CWR was possibly lost.
2914                  * See how old it is, we may have it marked on the actual
2915                  * net.
2916                  */
2917                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
2918                         if (tsn == net->last_cwr_tsn) {
2919                                 /* Found him, send it off */
2920                                 break;
2921                         }
2922                 }
2923                 if (net == NULL) {
2924                         /*
2925                          * If we reach here, we need to send a special CWR
2926                          * that says hey, we did this a long time ago and
2927                          * you lost the response.
2928                          */
2929                         net = TAILQ_FIRST(&stcb->asoc.nets);
2930                         if (net == NULL) {
2931                                 /* TSNH */
2932                                 return;
2933                         }
2934                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
2935                 } else {
2936                         override_bit = 0;
2937                 }
2938         } else {
2939                 override_bit = 0;
2940         }
2941         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
2942             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
2943                 /*
2944                  * JRS - Use the congestion control given in the pluggable
2945                  * CC module
2946                  */
2947                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
2948                 /*
2949                  * We reduce once every RTT. So we will only lower cwnd at
2950                  * the next sending seq i.e. the window_data_tsn
2951                  */
2952                 net->cwr_window_tsn = window_data_tsn;
2953                 net->ecn_ce_pkt_cnt += pkt_cnt;
2954                 net->lost_cnt = pkt_cnt;
2955                 net->last_cwr_tsn = tsn;
2956         } else {
2957                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
2958                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
2959                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
2960                         /*
2961                          * Another loss in the same window update how many
2962                          * marks/packets lost we have had.
2963                          */
2964                         int cnt = 1;
2965
2966                         if (pkt_cnt > net->lost_cnt) {
2967                                 /* Should be the case */
2968                                 cnt = (pkt_cnt - net->lost_cnt);
2969                                 net->ecn_ce_pkt_cnt += cnt;
2970                         }
2971                         net->lost_cnt = pkt_cnt;
2972                         net->last_cwr_tsn = tsn;
2973                         /*
2974                          * Most CC functions will ignore this call, since we
2975                          * are in-window yet of the initial CE the peer saw.
2976                          */
2977                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
2978                 }
2979         }
2980         /*
2981          * We always send a CWR this way if our previous one was lost our
2982          * peer will get an update, or if it is not time again to reduce we
2983          * still get the cwr to the peer. Note we set the override when we
2984          * could not find the TSN on the chunk or the destination network.
2985          */
2986         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
2987 }
2988
2989 static void
2990 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
2991 {
2992         /*
2993          * Here we get a CWR from the peer. We must look in the outqueue and
2994          * make sure that we have a covered ECNE in the control chunk part.
2995          * If so remove it.
2996          */
2997         struct sctp_tmit_chunk *chk, *nchk;
2998         struct sctp_ecne_chunk *ecne;
2999         int override;
3000         uint32_t cwr_tsn;
3001
3002         cwr_tsn = ntohl(cp->tsn);
3003         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3004         TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) {
3005                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3006                         continue;
3007                 }
3008                 if ((override == 0) && (chk->whoTo != net)) {
3009                         /* Must be from the right src unless override is set */
3010                         continue;
3011                 }
3012                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3013                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3014                         /* this covers this ECNE, we can remove it */
3015                         stcb->asoc.ecn_echo_cnt_onq--;
3016                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3017                             sctp_next);
3018                         stcb->asoc.ctrl_queue_cnt--;
3019                         sctp_m_freem(chk->data);
3020                         chk->data = NULL;
3021                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3022                         if (override == 0) {
3023                                 break;
3024                         }
3025                 }
3026         }
3027 }
3028
3029 static void
3030 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3031     struct sctp_tcb *stcb, struct sctp_nets *net)
3032 {
3033
3034         SCTPDBG(SCTP_DEBUG_INPUT2,
3035             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3036         if (stcb == NULL)
3037                 return;
3038
3039         /* process according to association state */
3040         if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3041                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3042                 SCTPDBG(SCTP_DEBUG_INPUT2,
3043                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3044                 SCTP_TCB_UNLOCK(stcb);
3045                 return;
3046         }
3047         /* notify upper layer protocol */
3048         if (stcb->sctp_socket) {
3049                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3050         }
3051 #ifdef INVARIANTS
3052         if (!TAILQ_EMPTY(&stcb->asoc.send_queue) ||
3053             !TAILQ_EMPTY(&stcb->asoc.sent_queue) ||
3054             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
3055                 panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
3056         }
3057 #endif
3058         /* stop the timer */
3059         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net,
3060             SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3061         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3062         /* free the TCB */
3063         SCTPDBG(SCTP_DEBUG_INPUT2,
3064             "sctp_handle_shutdown_complete: calls free-asoc\n");
3065         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
3066             SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3067         return;
3068 }
3069
3070 static int
3071 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3072     struct sctp_nets *net, uint8_t flg)
3073 {
3074         switch (desc->chunk_type) {
3075         case SCTP_DATA:
3076         case SCTP_IDATA:
3077                 /* find the tsn to resend (possibly) */
3078                 {
3079                         uint32_t tsn;
3080                         struct sctp_tmit_chunk *tp1;
3081
3082                         tsn = ntohl(desc->tsn_ifany);
3083                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3084                                 if (tp1->rec.data.tsn == tsn) {
3085                                         /* found it */
3086                                         break;
3087                                 }
3088                                 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) {
3089                                         /* not found */
3090                                         tp1 = NULL;
3091                                         break;
3092                                 }
3093                         }
3094                         if (tp1 == NULL) {
3095                                 /*
3096                                  * Do it the other way , aka without paying
3097                                  * attention to queue seq order.
3098                                  */
3099                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3100                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3101                                         if (tp1->rec.data.tsn == tsn) {
3102                                                 /* found it */
3103                                                 break;
3104                                         }
3105                                 }
3106                         }
3107                         if (tp1 == NULL) {
3108                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3109                         }
3110                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3111                                 if (((flg & SCTP_BADCRC) == 0) &&
3112                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3113                                         return (0);
3114                                 }
3115                                 if ((stcb->asoc.peers_rwnd == 0) &&
3116                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3117                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3118                                         return (0);
3119                                 }
3120                                 if (stcb->asoc.peers_rwnd == 0 &&
3121                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3122                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3123                                         return (0);
3124                                 }
3125                                 if ((uint32_t)SCTP_BUF_LEN(tp1->data) <
3126                                     SCTP_DATA_CHUNK_OVERHEAD(stcb) + SCTP_NUM_DB_TO_VERIFY) {
3127                                         /* Payload not matching. */
3128                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3129                                         return (-1);
3130                                 }
3131                                 if (memcmp(mtod(tp1->data, caddr_t)+SCTP_DATA_CHUNK_OVERHEAD(stcb),
3132                                     desc->data_bytes, SCTP_NUM_DB_TO_VERIFY) != 0) {
3133                                         /* Payload not matching. */
3134                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3135                                         return (-1);
3136                                 }
3137                                 if (tp1->do_rtt) {
3138                                         /*
3139                                          * this guy had a RTO calculation
3140                                          * pending on it, cancel it
3141                                          */
3142                                         if (tp1->whoTo->rto_needed == 0) {
3143                                                 tp1->whoTo->rto_needed = 1;
3144                                         }
3145                                         tp1->do_rtt = 0;
3146                                 }
3147                                 SCTP_STAT_INCR(sctps_pdrpmark);
3148                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3149                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3150                                 /*
3151                                  * mark it as if we were doing a FR, since
3152                                  * we will be getting gap ack reports behind
3153                                  * the info from the router.
3154                                  */
3155                                 tp1->rec.data.doing_fast_retransmit = 1;
3156                                 /*
3157                                  * mark the tsn with what sequences can
3158                                  * cause a new FR.
3159                                  */
3160                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3161                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3162                                 } else {
3163                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn;
3164                                 }
3165
3166                                 /* restart the timer */
3167                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3168                                     stcb, tp1->whoTo,
3169                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3170                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3171                                     stcb, tp1->whoTo);
3172
3173                                 /* fix counts and things */
3174                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3175                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3176                                             tp1->whoTo->flight_size,
3177                                             tp1->book_size,
3178                                             (uint32_t)(uintptr_t)stcb,
3179                                             tp1->rec.data.tsn);
3180                                 }
3181                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3182                                         sctp_flight_size_decrease(tp1);
3183                                         sctp_total_flight_decrease(stcb, tp1);
3184                                 }
3185                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3186                         } {
3187                                 /* audit code */
3188                                 unsigned int audit;
3189
3190                                 audit = 0;
3191                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3192                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3193                                                 audit++;
3194                                 }
3195                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3196                                     sctp_next) {
3197                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3198                                                 audit++;
3199                                 }
3200                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3201                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3202                                             audit, stcb->asoc.sent_queue_retran_cnt);
3203 #ifndef SCTP_AUDITING_ENABLED
3204                                         stcb->asoc.sent_queue_retran_cnt = audit;
3205 #endif
3206                                 }
3207                         }
3208                 }
3209                 break;
3210         case SCTP_ASCONF:
3211                 {
3212                         struct sctp_tmit_chunk *asconf;
3213
3214                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3215                             sctp_next) {
3216                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3217                                         break;
3218                                 }
3219                         }
3220                         if (asconf) {
3221                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3222                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3223                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3224                                 asconf->snd_count--;
3225                         }
3226                 }
3227                 break;
3228         case SCTP_INITIATION:
3229                 /* resend the INIT */
3230                 stcb->asoc.dropped_special_cnt++;
3231                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3232                         /*
3233                          * If we can get it in, in a few attempts we do
3234                          * this, otherwise we let the timer fire.
3235                          */
3236                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3237                             stcb, net,
3238                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
3239                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3240                 }
3241                 break;
3242         case SCTP_SELECTIVE_ACK:
3243         case SCTP_NR_SELECTIVE_ACK:
3244                 /* resend the sack */
3245                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3246                 break;
3247         case SCTP_HEARTBEAT_REQUEST:
3248                 /* resend a demand HB */
3249                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3250                         /*
3251                          * Only retransmit if we KNOW we wont destroy the
3252                          * tcb
3253                          */
3254                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3255                 }
3256                 break;
3257         case SCTP_SHUTDOWN:
3258                 sctp_send_shutdown(stcb, net);
3259                 break;
3260         case SCTP_SHUTDOWN_ACK:
3261                 sctp_send_shutdown_ack(stcb, net);
3262                 break;
3263         case SCTP_COOKIE_ECHO:
3264                 {
3265                         struct sctp_tmit_chunk *cookie;
3266
3267                         cookie = NULL;
3268                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3269                             sctp_next) {
3270                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3271                                         break;
3272                                 }
3273                         }
3274                         if (cookie) {
3275                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3276                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3277                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3278                                 sctp_stop_all_cookie_timers(stcb);
3279                         }
3280                 }
3281                 break;
3282         case SCTP_COOKIE_ACK:
3283                 sctp_send_cookie_ack(stcb);
3284                 break;
3285         case SCTP_ASCONF_ACK:
3286                 /* resend last asconf ack */
3287                 sctp_send_asconf_ack(stcb);
3288                 break;
3289         case SCTP_IFORWARD_CUM_TSN:
3290         case SCTP_FORWARD_CUM_TSN:
3291                 send_forward_tsn(stcb, &stcb->asoc);
3292                 break;
3293                 /* can't do anything with these */
3294         case SCTP_PACKET_DROPPED:
3295         case SCTP_INITIATION_ACK:       /* this should not happen */
3296         case SCTP_HEARTBEAT_ACK:
3297         case SCTP_ABORT_ASSOCIATION:
3298         case SCTP_OPERATION_ERROR:
3299         case SCTP_SHUTDOWN_COMPLETE:
3300         case SCTP_ECN_ECHO:
3301         case SCTP_ECN_CWR:
3302         default:
3303                 break;
3304         }
3305         return (0);
3306 }
3307
3308 void
3309 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3310 {
3311         uint32_t i;
3312         uint16_t temp;
3313
3314         /*
3315          * We set things to 0xffffffff since this is the last delivered
3316          * sequence and we will be sending in 0 after the reset.
3317          */
3318
3319         if (number_entries) {
3320                 for (i = 0; i < number_entries; i++) {
3321                         temp = ntohs(list[i]);
3322                         if (temp >= stcb->asoc.streamincnt) {
3323                                 continue;
3324                         }
3325                         stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff;
3326                 }
3327         } else {
3328                 list = NULL;
3329                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3330                         stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
3331                 }
3332         }
3333         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3334 }
3335
3336 static void
3337 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3338 {
3339         uint32_t i;
3340         uint16_t temp;
3341
3342         if (number_entries > 0) {
3343                 for (i = 0; i < number_entries; i++) {
3344                         temp = ntohs(list[i]);
3345                         if (temp >= stcb->asoc.streamoutcnt) {
3346                                 /* no such stream */
3347                                 continue;
3348                         }
3349                         stcb->asoc.strmout[temp].next_mid_ordered = 0;
3350                         stcb->asoc.strmout[temp].next_mid_unordered = 0;
3351                 }
3352         } else {
3353                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3354                         stcb->asoc.strmout[i].next_mid_ordered = 0;
3355                         stcb->asoc.strmout[i].next_mid_unordered = 0;
3356                 }
3357         }
3358         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3359 }
3360
3361 static void
3362 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3363 {
3364         uint32_t i;
3365         uint16_t temp;
3366
3367         if (number_entries > 0) {
3368                 for (i = 0; i < number_entries; i++) {
3369                         temp = ntohs(list[i]);
3370                         if (temp >= stcb->asoc.streamoutcnt) {
3371                                 /* no such stream */
3372                                 continue;
3373                         }
3374                         stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN;
3375                 }
3376         } else {
3377                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3378                         stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN;
3379                 }
3380         }
3381 }
3382
3383 struct sctp_stream_reset_request *
3384 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3385 {
3386         struct sctp_association *asoc;
3387         struct sctp_chunkhdr *ch;
3388         struct sctp_stream_reset_request *r;
3389         struct sctp_tmit_chunk *chk;
3390         int len, clen;
3391
3392         asoc = &stcb->asoc;
3393         chk = asoc->str_reset;
3394         if (TAILQ_EMPTY(&asoc->control_send_queue) ||
3395             (chk == NULL)) {
3396                 asoc->stream_reset_outstanding = 0;
3397                 return (NULL);
3398         }
3399         if (chk->data == NULL) {
3400                 return (NULL);
3401         }
3402         if (bchk != NULL) {
3403                 /* he wants a copy of the chk pointer */
3404                 *bchk = chk;
3405         }
3406         clen = chk->send_size;
3407         ch = mtod(chk->data, struct sctp_chunkhdr *);
3408         r = (struct sctp_stream_reset_request *)(ch + 1);
3409         if (ntohl(r->request_seq) == seq) {
3410                 /* found it */
3411                 return (r);
3412         }
3413         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3414         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3415                 /* move to the next one, there can only be a max of two */
3416                 r = (struct sctp_stream_reset_request *)((caddr_t)r + len);
3417                 if (ntohl(r->request_seq) == seq) {
3418                         return (r);
3419                 }
3420         }
3421         /* that seq is not here */
3422         return (NULL);
3423 }
3424
3425 static void
3426 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3427 {
3428         struct sctp_association *asoc;
3429         struct sctp_tmit_chunk *chk;
3430
3431         asoc = &stcb->asoc;
3432         chk = asoc->str_reset;
3433         if (chk == NULL) {
3434                 return;
3435         }
3436         asoc->str_reset = NULL;
3437         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb,
3438             NULL, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28);
3439         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
3440         asoc->ctrl_queue_cnt--;
3441         if (chk->data) {
3442                 sctp_m_freem(chk->data);
3443                 chk->data = NULL;
3444         }
3445         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3446 }
3447
3448 static int
3449 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3450     uint32_t seq, uint32_t action,
3451     struct sctp_stream_reset_response *respin)
3452 {
3453         uint16_t type;
3454         int lparam_len;
3455         struct sctp_association *asoc = &stcb->asoc;
3456         struct sctp_tmit_chunk *chk;
3457         struct sctp_stream_reset_request *req_param;
3458         struct sctp_stream_reset_out_request *req_out_param;
3459         struct sctp_stream_reset_in_request *req_in_param;
3460         uint32_t number_entries;
3461
3462         if (asoc->stream_reset_outstanding == 0) {
3463                 /* duplicate */
3464                 return (0);
3465         }
3466         if (seq == stcb->asoc.str_reset_seq_out) {
3467                 req_param = sctp_find_stream_reset(stcb, seq, &chk);
3468                 if (req_param != NULL) {
3469                         stcb->asoc.str_reset_seq_out++;
3470                         type = ntohs(req_param->ph.param_type);
3471                         lparam_len = ntohs(req_param->ph.param_length);
3472                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3473                                 int no_clear = 0;
3474
3475                                 req_out_param = (struct sctp_stream_reset_out_request *)req_param;
3476                                 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3477                                 asoc->stream_reset_out_is_outstanding = 0;
3478                                 if (asoc->stream_reset_outstanding)
3479                                         asoc->stream_reset_outstanding--;
3480                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3481                                         /* do it */
3482                                         sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
3483                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3484                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3485                                 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) {
3486                                         /*
3487                                          * Set it up so we don't stop
3488                                          * retransmitting
3489                                          */
3490                                         asoc->stream_reset_outstanding++;
3491                                         stcb->asoc.str_reset_seq_out--;
3492                                         asoc->stream_reset_out_is_outstanding = 1;
3493                                         no_clear = 1;
3494                                 } else {
3495                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3496                                 }
3497                                 if (no_clear == 0) {
3498                                         sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams);
3499                                 }
3500                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3501                                 req_in_param = (struct sctp_stream_reset_in_request *)req_param;
3502                                 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3503                                 if (asoc->stream_reset_outstanding)
3504                                         asoc->stream_reset_outstanding--;
3505                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3506                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3507                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3508                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3509                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3510                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3511                                 }
3512                         } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3513                                 /* Ok we now may have more streams */
3514                                 int num_stream;
3515
3516                                 num_stream = stcb->asoc.strm_pending_add_size;
3517                                 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3518                                         /* TSNH */
3519                                         num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3520                                 }
3521                                 stcb->asoc.strm_pending_add_size = 0;
3522                                 if (asoc->stream_reset_outstanding)
3523                                         asoc->stream_reset_outstanding--;
3524                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3525                                         /* Put the new streams into effect */
3526                                         int i;
3527
3528                                         for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) {
3529                                                 asoc->strmout[i].state = SCTP_STREAM_OPEN;
3530                                         }
3531                                         asoc->streamoutcnt += num_stream;
3532                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3533                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3534                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3535                                             SCTP_STREAM_CHANGE_DENIED);
3536                                 } else {
3537                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3538                                             SCTP_STREAM_CHANGE_FAILED);
3539                                 }
3540                         } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3541                                 if (asoc->stream_reset_outstanding)
3542                                         asoc->stream_reset_outstanding--;
3543                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3544                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3545                                             SCTP_STREAM_CHANGE_DENIED);
3546                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3547                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3548                                             SCTP_STREAM_CHANGE_FAILED);
3549                                 }
3550                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3551                                 /**
3552                                  * a) Adopt the new in tsn.
3553                                  * b) reset the map
3554                                  * c) Adopt the new out-tsn
3555                                  */
3556                                 struct sctp_stream_reset_response_tsn *resp;
3557                                 struct sctp_forward_tsn_chunk fwdtsn;
3558                                 int abort_flag = 0;
3559
3560                                 if (respin == NULL) {
3561                                         /* huh ? */
3562                                         return (0);
3563                                 }
3564                                 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
3565                                         return (0);
3566                                 }
3567                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3568                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3569                                         asoc->stream_reset_outstanding--;
3570                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3571                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3572                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3573                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3574                                         if (abort_flag) {
3575                                                 return (1);
3576                                         }
3577                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3578                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3579                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3580                                         }
3581
3582                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3583                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3584                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3585
3586                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3587                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3588
3589                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3590                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3591
3592                                         sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3593                                         sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3594                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3595                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3596                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3597                                             SCTP_ASSOC_RESET_DENIED);
3598                                 } else {
3599                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3600                                             SCTP_ASSOC_RESET_FAILED);
3601                                 }
3602                         }
3603                         /* get rid of the request and get the request flags */
3604                         if (asoc->stream_reset_outstanding == 0) {
3605                                 sctp_clean_up_stream_reset(stcb);
3606                         }
3607                 }
3608         }
3609         if (asoc->stream_reset_outstanding == 0) {
3610                 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3611         }
3612         return (0);
3613 }
3614
3615 static void
3616 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3617     struct sctp_tmit_chunk *chk,
3618     struct sctp_stream_reset_in_request *req, int trunc)
3619 {
3620         uint32_t seq;
3621         int len, i;
3622         int number_entries;
3623         uint16_t temp;
3624
3625         /*
3626          * peer wants me to send a str-reset to him for my outgoing seq's if
3627          * seq_in is right.
3628          */
3629         struct sctp_association *asoc = &stcb->asoc;
3630
3631         seq = ntohl(req->request_seq);
3632         if (asoc->str_reset_seq_in == seq) {
3633                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3634                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3635                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3636                 } else if (trunc) {
3637                         /* Can't do it, since they exceeded our buffer size  */
3638                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3639                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3640                         len = ntohs(req->ph.param_length);
3641                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3642                         if (number_entries) {
3643                                 for (i = 0; i < number_entries; i++) {
3644                                         temp = ntohs(req->list_of_streams[i]);
3645                                         if (temp >= stcb->asoc.streamoutcnt) {
3646                                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3647                                                 goto bad_boy;
3648                                         }
3649                                         req->list_of_streams[i] = temp;
3650                                 }
3651                                 for (i = 0; i < number_entries; i++) {
3652                                         if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) {
3653                                                 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING;
3654                                         }
3655                                 }
3656                         } else {
3657                                 /* Its all */
3658                                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3659                                         if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN)
3660                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING;
3661                                 }
3662                         }
3663                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3664                 } else {
3665                         /* Can't do it, since we have sent one out */
3666                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3667                 }
3668 bad_boy:
3669                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3670                 asoc->str_reset_seq_in++;
3671         } else if (asoc->str_reset_seq_in - 1 == seq) {
3672                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3673         } else if (asoc->str_reset_seq_in - 2 == seq) {
3674                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3675         } else {
3676                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3677         }
3678         sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3679 }
3680
3681 static int
3682 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3683     struct sctp_tmit_chunk *chk,
3684     struct sctp_stream_reset_tsn_request *req)
3685 {
3686         /* reset all in and out and update the tsn */
3687         /*
3688          * A) reset my str-seq's on in and out. B) Select a receive next,
3689          * and set cum-ack to it. Also process this selected number as a
3690          * fwd-tsn as well. C) set in the response my next sending seq.
3691          */
3692         struct sctp_forward_tsn_chunk fwdtsn;
3693         struct sctp_association *asoc = &stcb->asoc;
3694         int abort_flag = 0;
3695         uint32_t seq;
3696
3697         seq = ntohl(req->request_seq);
3698         if (asoc->str_reset_seq_in == seq) {
3699                 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3700                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3701                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3702                 } else {
3703                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3704                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3705                         fwdtsn.ch.chunk_flags = 0;
3706                         fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3707                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3708                         if (abort_flag) {
3709                                 return (1);
3710                         }
3711                         asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3712                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3713                                 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3714                         }
3715                         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3716                         asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3717                         memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3718                         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3719                         memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3720                         atomic_add_int(&asoc->sending_seq, 1);
3721                         /* save off historical data for retrans */
3722                         asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3723                         asoc->last_sending_seq[0] = asoc->sending_seq;
3724                         asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3725                         asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3726                         sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3727                         sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3728                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3729                         sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3730                 }
3731                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3732                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3733                 asoc->str_reset_seq_in++;
3734         } else if (asoc->str_reset_seq_in - 1 == seq) {
3735                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3736                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3737         } else if (asoc->str_reset_seq_in - 2 == seq) {
3738                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3739                     asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3740         } else {
3741                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3742         }
3743         return (0);
3744 }
3745
3746 static void
3747 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3748     struct sctp_tmit_chunk *chk,
3749     struct sctp_stream_reset_out_request *req, int trunc)
3750 {
3751         uint32_t seq, tsn;
3752         int number_entries, len;
3753         struct sctp_association *asoc = &stcb->asoc;
3754
3755         seq = ntohl(req->request_seq);
3756
3757         /* now if its not a duplicate we process it */
3758         if (asoc->str_reset_seq_in == seq) {
3759                 len = ntohs(req->ph.param_length);
3760                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3761                 /*
3762                  * the sender is resetting, handle the list issue.. we must
3763                  * a) verify if we can do the reset, if so no problem b) If
3764                  * we can't do the reset we must copy the request. c) queue
3765                  * it, and setup the data in processor to trigger it off
3766                  * when needed and dequeue all the queued data.
3767                  */
3768                 tsn = ntohl(req->send_reset_at_tsn);
3769
3770                 /* move the reset action back one */
3771                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3772                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3773                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3774                 } else if (trunc) {
3775                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3776                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3777                         /* we can do it now */
3778                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3779                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3780                 } else {
3781                         /*
3782                          * we must queue it up and thus wait for the TSN's
3783                          * to arrive that are at or before tsn
3784                          */
3785                         struct sctp_stream_reset_list *liste;
3786                         int siz;
3787
3788                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3789                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3790                             siz, SCTP_M_STRESET);
3791                         if (liste == NULL) {
3792                                 /* gak out of memory */
3793                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3794                                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3795                                 return;
3796                         }
3797                         liste->seq = seq;
3798                         liste->tsn = tsn;
3799                         liste->number_entries = number_entries;
3800                         memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
3801                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3802                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS;
3803                 }
3804                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3805                 asoc->str_reset_seq_in++;
3806         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3807                 /*
3808                  * one seq back, just echo back last action since my
3809                  * response was lost.
3810                  */
3811                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3812         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3813                 /*
3814                  * two seq back, just echo back last action since my
3815                  * response was lost.
3816                  */
3817                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3818         } else {
3819                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3820         }
3821 }
3822
3823 static void
3824 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3825     struct sctp_stream_reset_add_strm *str_add)
3826 {
3827         /*
3828          * Peer is requesting to add more streams. If its within our
3829          * max-streams we will allow it.
3830          */
3831         uint32_t num_stream, i;
3832         uint32_t seq;
3833         struct sctp_association *asoc = &stcb->asoc;
3834         struct sctp_queued_to_read *ctl, *nctl;
3835
3836         /* Get the number. */
3837         seq = ntohl(str_add->request_seq);
3838         num_stream = ntohs(str_add->number_of_streams);
3839         /* Now what would be the new total? */
3840         if (asoc->str_reset_seq_in == seq) {
3841                 num_stream += stcb->asoc.streamincnt;
3842                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3843                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3844                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3845                 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
3846                     (num_stream > 0xffff)) {
3847                         /* We must reject it they ask for to many */
3848         denied:
3849                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3850                 } else {
3851                         /* Ok, we can do that :-) */
3852                         struct sctp_stream_in *oldstrm;
3853
3854                         /* save off the old */
3855                         oldstrm = stcb->asoc.strmin;
3856                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
3857                             (num_stream * sizeof(struct sctp_stream_in)),
3858                             SCTP_M_STRMI);
3859                         if (stcb->asoc.strmin == NULL) {
3860                                 stcb->asoc.strmin = oldstrm;
3861                                 goto denied;
3862                         }
3863                         /* copy off the old data */
3864                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
3865                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3866                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
3867                                 stcb->asoc.strmin[i].sid = i;
3868                                 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered;
3869                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
3870                                 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started;
3871                                 /* now anything on those queues? */
3872                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) {
3873                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm);
3874                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm);
3875                                 }
3876                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) {
3877                                         TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm);
3878                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm);
3879                                 }
3880                         }
3881                         /* Init the new streams */
3882                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
3883                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3884                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
3885                                 stcb->asoc.strmin[i].sid = i;
3886                                 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
3887                                 stcb->asoc.strmin[i].pd_api_started = 0;
3888                                 stcb->asoc.strmin[i].delivery_started = 0;
3889                         }
3890                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
3891                         /* update the size */
3892                         stcb->asoc.streamincnt = num_stream;
3893                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3894                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3895                 }
3896                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3897                 asoc->str_reset_seq_in++;
3898         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3899                 /*
3900                  * one seq back, just echo back last action since my
3901                  * response was lost.
3902                  */
3903                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3904         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3905                 /*
3906                  * two seq back, just echo back last action since my
3907                  * response was lost.
3908                  */
3909                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3910         } else {
3911                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3912         }
3913 }
3914
3915 static void
3916 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3917     struct sctp_stream_reset_add_strm *str_add)
3918 {
3919         /*
3920          * Peer is requesting to add more streams. If its within our
3921          * max-streams we will allow it.
3922          */
3923         uint16_t num_stream;
3924         uint32_t seq;
3925         struct sctp_association *asoc = &stcb->asoc;
3926
3927         /* Get the number. */
3928         seq = ntohl(str_add->request_seq);
3929         num_stream = ntohs(str_add->number_of_streams);
3930         /* Now what would be the new total? */
3931         if (asoc->str_reset_seq_in == seq) {
3932                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3933                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3934                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3935                 } else if (stcb->asoc.stream_reset_outstanding) {
3936                         /* We must reject it we have something pending */
3937                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3938                 } else {
3939                         /* Ok, we can do that :-) */
3940                         int mychk;
3941
3942                         mychk = stcb->asoc.streamoutcnt;
3943                         mychk += num_stream;
3944                         if (mychk < 0x10000) {
3945                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3946                                 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) {
3947                                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3948                                 }
3949                         } else {
3950                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3951                         }
3952                 }
3953                 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
3954                 asoc->str_reset_seq_in++;
3955         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3956                 /*
3957                  * one seq back, just echo back last action since my
3958                  * response was lost.
3959                  */
3960                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3961         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3962                 /*
3963                  * two seq back, just echo back last action since my
3964                  * response was lost.
3965                  */
3966                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3967         } else {
3968                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3969         }
3970 }
3971
3972 #ifdef __GNUC__
3973 __attribute__((noinline))
3974 #endif
3975 static int
3976 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
3977     struct sctp_chunkhdr *ch_req)
3978 {
3979         uint16_t remaining_length, param_len, ptype;
3980         struct sctp_paramhdr pstore;
3981         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
3982         uint32_t seq = 0;
3983         int num_req = 0;
3984         int trunc = 0;
3985         struct sctp_tmit_chunk *chk;
3986         struct sctp_chunkhdr *ch;
3987         struct sctp_paramhdr *ph;
3988         int ret_code = 0;
3989         int num_param = 0;
3990
3991         /* now it may be a reset or a reset-response */
3992         remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
3993
3994         /* setup for adding the response */
3995         sctp_alloc_a_chunk(stcb, chk);
3996         if (chk == NULL) {
3997                 return (ret_code);
3998         }
3999         chk->copy_by_ref = 0;
4000         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
4001         chk->rec.chunk_id.can_take_data = 0;
4002         chk->flags = 0;
4003         chk->asoc = &stcb->asoc;
4004         chk->no_fr_allowed = 0;
4005         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
4006         chk->book_size_scale = 0;
4007         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
4008         if (chk->data == NULL) {
4009 strres_nochunk:
4010                 if (chk->data) {
4011                         sctp_m_freem(chk->data);
4012                         chk->data = NULL;
4013                 }
4014                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
4015                 return (ret_code);
4016         }
4017         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
4018
4019         /* setup chunk parameters */
4020         chk->sent = SCTP_DATAGRAM_UNSENT;
4021         chk->snd_count = 0;
4022         chk->whoTo = NULL;
4023
4024         ch = mtod(chk->data, struct sctp_chunkhdr *);
4025         ch->chunk_type = SCTP_STREAM_RESET;
4026         ch->chunk_flags = 0;
4027         ch->chunk_length = htons(chk->send_size);
4028         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4029         offset += sizeof(struct sctp_chunkhdr);
4030         while (remaining_length >= sizeof(struct sctp_paramhdr)) {
4031                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore);
4032                 if (ph == NULL) {
4033                         /* TSNH */
4034                         break;
4035                 }
4036                 param_len = ntohs(ph->param_length);
4037                 if ((param_len > remaining_length) ||
4038                     (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
4039                         /* bad parameter length */
4040                         break;
4041                 }
4042                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
4043                     (uint8_t *)&cstore);
4044                 if (ph == NULL) {
4045                         /* TSNH */
4046                         break;
4047                 }
4048                 ptype = ntohs(ph->param_type);
4049                 num_param++;
4050                 if (param_len > sizeof(cstore)) {
4051                         trunc = 1;
4052                 } else {
4053                         trunc = 0;
4054                 }
4055                 if (num_param > SCTP_MAX_RESET_PARAMS) {
4056                         /* hit the max of parameters already sorry.. */
4057                         break;
4058                 }
4059                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4060                         struct sctp_stream_reset_out_request *req_out;
4061
4062                         if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
4063                                 break;
4064                         }
4065                         req_out = (struct sctp_stream_reset_out_request *)ph;
4066                         num_req++;
4067                         if (stcb->asoc.stream_reset_outstanding) {
4068                                 seq = ntohl(req_out->response_seq);
4069                                 if (seq == stcb->asoc.str_reset_seq_out) {
4070                                         /* implicit ack */
4071                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4072                                 }
4073                         }
4074                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4075                 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4076                         struct sctp_stream_reset_add_strm *str_add;
4077
4078                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4079                                 break;
4080                         }
4081                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4082                         num_req++;
4083                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4084                 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4085                         struct sctp_stream_reset_add_strm *str_add;
4086
4087                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4088                                 break;
4089                         }
4090                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4091                         num_req++;
4092                         sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4093                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4094                         struct sctp_stream_reset_in_request *req_in;
4095
4096                         num_req++;
4097                         req_in = (struct sctp_stream_reset_in_request *)ph;
4098                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4099                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4100                         struct sctp_stream_reset_tsn_request *req_tsn;
4101
4102                         num_req++;
4103                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4104                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4105                                 ret_code = 1;
4106                                 goto strres_nochunk;
4107                         }
4108                         /* no more */
4109                         break;
4110                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4111                         struct sctp_stream_reset_response *resp;
4112                         uint32_t result;
4113
4114                         if (param_len < sizeof(struct sctp_stream_reset_response)) {
4115                                 break;
4116                         }
4117                         resp = (struct sctp_stream_reset_response *)ph;
4118                         seq = ntohl(resp->response_seq);
4119                         result = ntohl(resp->result);
4120                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4121                                 ret_code = 1;
4122                                 goto strres_nochunk;
4123                         }
4124                 } else {
4125                         break;
4126                 }
4127                 offset += SCTP_SIZE32(param_len);
4128                 if (remaining_length >= SCTP_SIZE32(param_len)) {
4129                         remaining_length -= SCTP_SIZE32(param_len);
4130                 } else {
4131                         remaining_length = 0;
4132                 }
4133         }
4134         if (num_req == 0) {
4135                 /* we have no response free the stuff */
4136                 goto strres_nochunk;
4137         }
4138         /* ok we have a chunk to link in */
4139         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4140             chk,
4141             sctp_next);
4142         stcb->asoc.ctrl_queue_cnt++;
4143         return (ret_code);
4144 }
4145
4146 /*
4147  * Handle a router or endpoints report of a packet loss, there are two ways
4148  * to handle this, either we get the whole packet and must disect it
4149  * ourselves (possibly with truncation and or corruption) or it is a summary
4150  * from a middle box that did the disectting for us.
4151  */
4152 static void
4153 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4154     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4155 {
4156         struct sctp_chunk_desc desc;
4157         struct sctp_chunkhdr *chk_hdr;
4158         struct sctp_data_chunk *data_chunk;
4159         struct sctp_idata_chunk *idata_chunk;
4160         uint32_t bottle_bw, on_queue;
4161         uint32_t offset, chk_len;
4162         uint16_t pktdrp_len;
4163         uint8_t pktdrp_flags;
4164
4165         KASSERT(sizeof(struct sctp_pktdrop_chunk) <= limit,
4166             ("PKTDROP chunk too small"));
4167         pktdrp_flags = cp->ch.chunk_flags;
4168         pktdrp_len = ntohs(cp->ch.chunk_length);
4169         KASSERT(limit <= pktdrp_len, ("Inconsistent limit"));
4170         if (pktdrp_flags & SCTP_PACKET_TRUNCATED) {
4171                 if (ntohs(cp->trunc_len) <= pktdrp_len - sizeof(struct sctp_pktdrop_chunk)) {
4172                         /* The peer plays games with us. */
4173                         return;
4174                 }
4175         }
4176         limit -= sizeof(struct sctp_pktdrop_chunk);
4177         offset = 0;
4178         if (offset == limit) {
4179                 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4180                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4181                 }
4182         } else if (offset + sizeof(struct sctphdr) > limit) {
4183                 /* Only a partial SCTP common header. */
4184                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4185                 offset = limit;
4186         } else {
4187                 /* XXX: Check embedded SCTP common header. */
4188                 offset += sizeof(struct sctphdr);
4189         }
4190         /* Now parse through the chunks themselves. */
4191         while (offset < limit) {
4192                 if (offset + sizeof(struct sctp_chunkhdr) > limit) {
4193                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4194                         break;
4195                 }
4196                 chk_hdr = (struct sctp_chunkhdr *)(cp->data + offset);
4197                 desc.chunk_type = chk_hdr->chunk_type;
4198                 /* get amount we need to move */
4199                 chk_len = (uint32_t)ntohs(chk_hdr->chunk_length);
4200                 if (chk_len < sizeof(struct sctp_chunkhdr)) {
4201                         /* Someone is lying... */
4202                         break;
4203                 }
4204                 if (desc.chunk_type == SCTP_DATA) {
4205                         if (stcb->asoc.idata_supported) {
4206                                 /* Some is playing games with us. */
4207                                 break;
4208                         }
4209                         if (chk_len <= sizeof(struct sctp_data_chunk)) {
4210                                 /* Some is playing games with us. */
4211                                 break;
4212                         }
4213                         if (chk_len < sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY) {
4214                                 /*
4215                                  * Not enough data bytes available in the
4216                                  * chunk.
4217                                  */
4218                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4219                                 goto next_chunk;
4220                         }
4221                         if (offset + sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) {
4222                                 /* Not enough data in buffer. */
4223                                 break;
4224                         }
4225                         data_chunk = (struct sctp_data_chunk *)(cp->data + offset);
4226                         memcpy(desc.data_bytes, data_chunk + 1, SCTP_NUM_DB_TO_VERIFY);
4227                         desc.tsn_ifany = data_chunk->dp.tsn;
4228                         if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4229                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4230                         }
4231                 } else if (desc.chunk_type == SCTP_IDATA) {
4232                         if (!stcb->asoc.idata_supported) {
4233                                 /* Some is playing games with us. */
4234                                 break;
4235                         }
4236                         if (chk_len <= sizeof(struct sctp_idata_chunk)) {
4237                                 /* Some is playing games with us. */
4238                                 break;
4239                         }
4240                         if (chk_len < sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY) {
4241                                 /*
4242                                  * Not enough data bytes available in the
4243                                  * chunk.
4244                                  */
4245                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4246                                 goto next_chunk;
4247                         }
4248                         if (offset + sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) {
4249                                 /* Not enough data in buffer. */
4250                                 break;
4251                         }
4252                         idata_chunk = (struct sctp_idata_chunk *)(cp->data + offset);
4253                         memcpy(desc.data_bytes, idata_chunk + 1, SCTP_NUM_DB_TO_VERIFY);
4254                         desc.tsn_ifany = idata_chunk->dp.tsn;
4255                         if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4256                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4257                         }
4258                 } else {
4259                         if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4260                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4261                         }
4262                 }
4263                 if (process_chunk_drop(stcb, &desc, net, pktdrp_flags)) {
4264                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4265                         break;
4266                 }
4267 next_chunk:
4268                 offset += SCTP_SIZE32(chk_len);
4269         }
4270         /* Now update any rwnd --- possibly */
4271         if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4272                 /* From a peer, we get a rwnd report */
4273                 uint32_t a_rwnd;
4274
4275                 SCTP_STAT_INCR(sctps_pdrpfehos);
4276
4277                 bottle_bw = ntohl(cp->bottle_bw);
4278                 on_queue = ntohl(cp->current_onq);
4279                 if (bottle_bw && on_queue) {
4280                         /* a rwnd report is in here */
4281                         if (bottle_bw > on_queue)
4282                                 a_rwnd = bottle_bw - on_queue;
4283                         else
4284                                 a_rwnd = 0;
4285
4286                         if (a_rwnd == 0)
4287                                 stcb->asoc.peers_rwnd = 0;
4288                         else {
4289                                 if (a_rwnd > stcb->asoc.total_flight) {
4290                                         stcb->asoc.peers_rwnd =
4291                                             a_rwnd - stcb->asoc.total_flight;
4292                                 } else {
4293                                         stcb->asoc.peers_rwnd = 0;
4294                                 }
4295                                 if (stcb->asoc.peers_rwnd <
4296                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4297                                         /* SWS sender side engages */
4298                                         stcb->asoc.peers_rwnd = 0;
4299                                 }
4300                         }
4301                 }
4302         } else {
4303                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4304         }
4305
4306         /* now middle boxes in sat networks get a cwnd bump */
4307         if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) &&
4308             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4309             (stcb->asoc.sat_network)) {
4310                 /*
4311                  * This is debatable but for sat networks it makes sense
4312                  * Note if a T3 timer has went off, we will prohibit any
4313                  * changes to cwnd until we exit the t3 loss recovery.
4314                  */
4315                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4316                     net, cp, &bottle_bw, &on_queue);
4317         }
4318 }
4319
4320 /*
4321  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4322  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4323  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4324  * length of the complete packet outputs: - length: modified to remaining
4325  * length after control processing - netp: modified to new sctp_nets after
4326  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4327  * bad packet,...) otherwise return the tcb for this packet
4328  */
4329 #ifdef __GNUC__
4330 __attribute__((noinline))
4331 #endif
4332 static struct sctp_tcb *
4333 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4334     struct sockaddr *src, struct sockaddr *dst,
4335     struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4336     struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4337     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
4338     uint32_t vrf_id, uint16_t port)
4339 {
4340         struct sctp_association *asoc;
4341         struct mbuf *op_err;
4342         char msg[SCTP_DIAG_INFO_LEN];
4343         uint32_t vtag_in;
4344         int num_chunks = 0;     /* number of control chunks processed */
4345         uint32_t chk_length, contiguous;
4346         int ret;
4347         int abort_no_unlock = 0;
4348         int ecne_seen = 0;
4349         int abort_flag;
4350
4351         /*
4352          * How big should this be, and should it be alloc'd? Lets try the
4353          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4354          * until we get into jumbo grams and such..
4355          */
4356         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4357         int got_auth = 0;
4358         uint32_t auth_offset = 0, auth_len = 0;
4359         int auth_skipped = 0;
4360         int asconf_cnt = 0;
4361
4362         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4363             iphlen, *offset, length, (void *)stcb);
4364
4365         if (stcb) {
4366                 SCTP_TCB_LOCK_ASSERT(stcb);
4367         }
4368         /* validate chunk header length... */
4369         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4370                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4371                     ntohs(ch->chunk_length));
4372                 *offset = length;
4373                 return (stcb);
4374         }
4375         /*
4376          * validate the verification tag
4377          */
4378         vtag_in = ntohl(sh->v_tag);
4379
4380         if (ch->chunk_type == SCTP_INITIATION) {
4381                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4382                     ntohs(ch->chunk_length), vtag_in);
4383                 if (vtag_in != 0) {
4384                         /* protocol error- silently discard... */
4385                         SCTP_STAT_INCR(sctps_badvtag);
4386                         if (stcb != NULL) {
4387                                 SCTP_TCB_UNLOCK(stcb);
4388                         }
4389                         return (NULL);
4390                 }
4391         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4392                 /*
4393                  * If there is no stcb, skip the AUTH chunk and process
4394                  * later after a stcb is found (to validate the lookup was
4395                  * valid.
4396                  */
4397                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4398                     (stcb == NULL) &&
4399                     (inp->auth_supported == 1)) {
4400                         /* save this chunk for later processing */
4401                         auth_skipped = 1;
4402                         auth_offset = *offset;
4403                         auth_len = ntohs(ch->chunk_length);
4404
4405                         /* (temporarily) move past this chunk */
4406                         *offset += SCTP_SIZE32(auth_len);
4407                         if (*offset >= length) {
4408                                 /* no more data left in the mbuf chain */
4409                                 *offset = length;
4410                                 return (NULL);
4411                         }
4412                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4413                             sizeof(struct sctp_chunkhdr), chunk_buf);
4414                 }
4415                 if (ch == NULL) {
4416                         /* Help */
4417                         *offset = length;
4418                         return (stcb);
4419                 }
4420                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4421                         goto process_control_chunks;
4422                 }
4423                 /*
4424                  * first check if it's an ASCONF with an unknown src addr we
4425                  * need to look inside to find the association
4426                  */
4427                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4428                         struct sctp_chunkhdr *asconf_ch = ch;
4429                         uint32_t asconf_offset = 0, asconf_len = 0;
4430
4431                         /* inp's refcount may be reduced */
4432                         SCTP_INP_INCR_REF(inp);
4433
4434                         asconf_offset = *offset;
4435                         do {
4436                                 asconf_len = ntohs(asconf_ch->chunk_length);
4437                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4438                                         break;
4439                                 stcb = sctp_findassociation_ep_asconf(m,
4440                                     *offset,
4441                                     dst,
4442                                     sh, &inp, netp, vrf_id);
4443                                 if (stcb != NULL)
4444                                         break;
4445                                 asconf_offset += SCTP_SIZE32(asconf_len);
4446                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4447                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4448                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4449                         if (stcb == NULL) {
4450                                 /*
4451                                  * reduce inp's refcount if not reduced in
4452                                  * sctp_findassociation_ep_asconf().
4453                                  */
4454                                 SCTP_INP_DECR_REF(inp);
4455                         }
4456
4457                         /* now go back and verify any auth chunk to be sure */
4458                         if (auth_skipped && (stcb != NULL)) {
4459                                 struct sctp_auth_chunk *auth;
4460
4461                                 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) {
4462                                         auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, chunk_buf);
4463                                         got_auth = 1;
4464                                         auth_skipped = 0;
4465                                 } else {
4466                                         auth = NULL;
4467                                 }
4468                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4469                                     auth_offset)) {
4470                                         /* auth HMAC failed so dump it */
4471                                         *offset = length;
4472                                         return (stcb);
4473                                 } else {
4474                                         /* remaining chunks are HMAC checked */
4475                                         stcb->asoc.authenticated = 1;
4476                                 }
4477                         }
4478                 }
4479                 if (stcb == NULL) {
4480                         SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4481                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4482                             msg);
4483                         /* no association, so it's out of the blue... */
4484                         sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
4485                             mflowtype, mflowid, inp->fibnum,
4486                             vrf_id, port);
4487                         *offset = length;
4488                         return (NULL);
4489                 }
4490                 asoc = &stcb->asoc;
4491                 /* ABORT and SHUTDOWN can use either v_tag... */
4492                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4493                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4494                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4495                         /* Take the T-bit always into account. */
4496                         if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
4497                             (vtag_in == asoc->my_vtag)) ||
4498                             (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
4499                             (asoc->peer_vtag != htonl(0)) &&
4500                             (vtag_in == asoc->peer_vtag))) {
4501                                 /* this is valid */
4502                         } else {
4503                                 /* drop this packet... */
4504                                 SCTP_STAT_INCR(sctps_badvtag);
4505                                 if (stcb != NULL) {
4506                                         SCTP_TCB_UNLOCK(stcb);
4507                                 }
4508                                 return (NULL);
4509                         }
4510                 } else {
4511                         /* for all other chunks, vtag must match */
4512                         if (vtag_in != asoc->my_vtag) {
4513                                 /* invalid vtag... */
4514                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4515                                     "invalid vtag: %xh, expect %xh\n",
4516                                     vtag_in, asoc->my_vtag);
4517                                 SCTP_STAT_INCR(sctps_badvtag);
4518                                 if (stcb != NULL) {
4519                                         SCTP_TCB_UNLOCK(stcb);
4520                                 }
4521                                 *offset = length;
4522                                 return (NULL);
4523                         }
4524                 }
4525         }                       /* end if !SCTP_COOKIE_ECHO */
4526         /*
4527          * process all control chunks...
4528          */
4529         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4530             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4531             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4532             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
4533                 /* implied cookie-ack.. we must have lost the ack */
4534                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4535                     *netp);
4536         }
4537
4538 process_control_chunks:
4539         while (IS_SCTP_CONTROL(ch)) {
4540                 /* validate chunk length */
4541                 chk_length = ntohs(ch->chunk_length);
4542                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4543                     ch->chunk_type, chk_length);
4544                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4545                 if (chk_length < sizeof(*ch) ||
4546                     (*offset + (int)chk_length) > length) {
4547                         *offset = length;
4548                         return (stcb);
4549                 }
4550                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4551                 /*
4552                  * INIT and INIT-ACK only gets the init ack "header" portion
4553                  * only because we don't have to process the peer's COOKIE.
4554                  * All others get a complete chunk.
4555                  */
4556                 switch (ch->chunk_type) {
4557                 case SCTP_INITIATION:
4558                         contiguous = sizeof(struct sctp_init_chunk);
4559                         break;
4560                 case SCTP_INITIATION_ACK:
4561                         contiguous = sizeof(struct sctp_init_ack_chunk);
4562                         break;
4563                 default:
4564                         contiguous = min(chk_length, sizeof(chunk_buf));
4565                         break;
4566                 }
4567                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4568                     contiguous,
4569                     chunk_buf);
4570                 if (ch == NULL) {
4571                         *offset = length;
4572                         return (stcb);
4573                 }
4574
4575                 num_chunks++;
4576                 /* Save off the last place we got a control from */
4577                 if (stcb != NULL) {
4578                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4579                                 /*
4580                                  * allow last_control to be NULL if
4581                                  * ASCONF... ASCONF processing will find the
4582                                  * right net later
4583                                  */
4584                                 if ((netp != NULL) && (*netp != NULL))
4585                                         stcb->asoc.last_control_chunk_from = *netp;
4586                         }
4587                 }
4588 #ifdef SCTP_AUDITING_ENABLED
4589                 sctp_audit_log(0xB0, ch->chunk_type);
4590 #endif
4591
4592                 /* check to see if this chunk required auth, but isn't */
4593                 if ((stcb != NULL) &&
4594                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4595                     !stcb->asoc.authenticated) {
4596                         /* "silently" ignore */
4597                         SCTP_STAT_INCR(sctps_recvauthmissing);
4598                         goto next_chunk;
4599                 }
4600                 switch (ch->chunk_type) {
4601                 case SCTP_INITIATION:
4602                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4603                         /* The INIT chunk must be the only chunk. */
4604                         if ((num_chunks > 1) ||
4605                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4606                                 /*
4607                                  * RFC 4960bis requires stopping the
4608                                  * processing of the packet.
4609                                  */
4610                                 *offset = length;
4611                                 return (stcb);
4612                         }
4613                         /* Honor our resource limit. */
4614                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4615                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4616                                 sctp_abort_association(inp, stcb, m, iphlen,
4617                                     src, dst, sh, op_err,
4618                                     mflowtype, mflowid,
4619                                     vrf_id, port);
4620                                 *offset = length;
4621                                 return (NULL);
4622                         }
4623                         sctp_handle_init(m, iphlen, *offset, src, dst, sh,
4624                             (struct sctp_init_chunk *)ch, inp,
4625                             stcb, *netp, &abort_no_unlock,
4626                             mflowtype, mflowid,
4627                             vrf_id, port);
4628                         *offset = length;
4629                         if ((!abort_no_unlock) && (stcb != NULL)) {
4630                                 SCTP_TCB_UNLOCK(stcb);
4631                         }
4632                         return (NULL);
4633                         break;
4634                 case SCTP_PAD_CHUNK:
4635                         break;
4636                 case SCTP_INITIATION_ACK:
4637                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n");
4638                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4639                                 /* We are not interested anymore */
4640                                 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) {
4641                                         ;
4642                                 } else {
4643                                         *offset = length;
4644                                         if (stcb != NULL) {
4645                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
4646                                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
4647                                         }
4648                                         return (NULL);
4649                                 }
4650                         }
4651                         /* The INIT-ACK chunk must be the only chunk. */
4652                         if ((num_chunks > 1) ||
4653                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4654                                 *offset = length;
4655                                 return (stcb);
4656                         }
4657                         if ((netp != NULL) && (*netp != NULL)) {
4658                                 ret = sctp_handle_init_ack(m, iphlen, *offset,
4659                                     src, dst, sh,
4660                                     (struct sctp_init_ack_chunk *)ch,
4661                                     stcb, *netp,
4662                                     &abort_no_unlock,
4663                                     mflowtype, mflowid,
4664                                     vrf_id);
4665                         } else {
4666                                 ret = -1;
4667                         }
4668                         *offset = length;
4669                         if (abort_no_unlock) {
4670                                 return (NULL);
4671                         }
4672                         /*
4673                          * Special case, I must call the output routine to
4674                          * get the cookie echoed
4675                          */
4676                         if ((stcb != NULL) && (ret == 0)) {
4677                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4678                         }
4679                         return (stcb);
4680                         break;
4681                 case SCTP_SELECTIVE_ACK:
4682                 case SCTP_NR_SELECTIVE_ACK:
4683                         {
4684                                 int abort_now = 0;
4685                                 uint32_t a_rwnd, cum_ack;
4686                                 uint16_t num_seg, num_nr_seg, num_dup;
4687                                 uint8_t flags;
4688                                 int offset_seg, offset_dup;
4689
4690                                 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n",
4691                                     ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK");
4692                                 SCTP_STAT_INCR(sctps_recvsacks);
4693                                 if (stcb == NULL) {
4694                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n",
4695                                             (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK");
4696                                         break;
4697                                 }
4698                                 if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
4699                                         if (chk_length < sizeof(struct sctp_sack_chunk)) {
4700                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4701                                                 break;
4702                                         }
4703                                 } else {
4704                                         if (stcb->asoc.nrsack_supported == 0) {
4705                                                 goto unknown_chunk;
4706                                         }
4707                                         if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
4708                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n");
4709                                                 break;
4710                                         }
4711                                 }
4712                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4713                                         /*-
4714                                          * If we have sent a shutdown-ack, we will pay no
4715                                          * attention to a sack sent in to us since
4716                                          * we don't care anymore.
4717                                          */
4718                                         break;
4719                                 }
4720                                 flags = ch->chunk_flags;
4721                                 if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
4722                                         struct sctp_sack_chunk *sack;
4723
4724                                         sack = (struct sctp_sack_chunk *)ch;
4725                                         cum_ack = ntohl(sack->sack.cum_tsn_ack);
4726                                         num_seg = ntohs(sack->sack.num_gap_ack_blks);
4727                                         num_nr_seg = 0;
4728                                         num_dup = ntohs(sack->sack.num_dup_tsns);
4729                                         a_rwnd = ntohl(sack->sack.a_rwnd);
4730                                         if (sizeof(struct sctp_sack_chunk) +
4731                                             num_seg * sizeof(struct sctp_gap_ack_block) +
4732                                             num_dup * sizeof(uint32_t) != chk_length) {
4733                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4734                                                 break;
4735                                         }
4736                                         offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4737                                         offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4738                                 } else {
4739                                         struct sctp_nr_sack_chunk *nr_sack;
4740
4741                                         nr_sack = (struct sctp_nr_sack_chunk *)ch;
4742                                         cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
4743                                         num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
4744                                         num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
4745                                         num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
4746                                         a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd);
4747                                         if (sizeof(struct sctp_nr_sack_chunk) +
4748                                             (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
4749                                             num_dup * sizeof(uint32_t) != chk_length) {
4750                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
4751                                                 break;
4752                                         }
4753                                         offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
4754                                         offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block);
4755                                 }
4756                                 SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4757                                     (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK",
4758                                     cum_ack, num_seg, a_rwnd);
4759                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4760                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4761                                     (num_seg == 0) && (num_nr_seg == 0) &&
4762                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4763                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4764                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4765                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
4766                                         /*
4767                                          * We have a SIMPLE sack having no
4768                                          * prior segments and data on sent
4769                                          * queue to be acked. Use the faster
4770                                          * path sack processing. We also
4771                                          * allow window update sacks with no
4772                                          * missing segments to go this way
4773                                          * too.
4774                                          */
4775                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
4776                                             &abort_now, ecne_seen);
4777                                 } else {
4778                                         if ((netp != NULL) && (*netp != NULL)) {
4779                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4780                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
4781                                                     cum_ack, a_rwnd, ecne_seen);
4782                                         }
4783                                 }
4784                                 if (abort_now) {
4785                                         /* ABORT signal from sack processing */
4786                                         *offset = length;
4787                                         return (NULL);
4788                                 }
4789                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4790                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4791                                     (stcb->asoc.stream_queue_cnt == 0)) {
4792                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4793                                 }
4794                                 break;
4795                         }
4796                 case SCTP_HEARTBEAT_REQUEST:
4797                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
4798                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
4799                                 SCTP_STAT_INCR(sctps_recvheartbeat);
4800                                 sctp_send_heartbeat_ack(stcb, m, *offset,
4801                                     chk_length, *netp);
4802                         }
4803                         break;
4804                 case SCTP_HEARTBEAT_ACK:
4805                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n");
4806                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
4807                                 /* Its not ours */
4808                                 break;
4809                         }
4810                         SCTP_STAT_INCR(sctps_recvheartbeatack);
4811                         if ((netp != NULL) && (*netp != NULL)) {
4812                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
4813                                     stcb, *netp);
4814                         }
4815                         break;
4816                 case SCTP_ABORT_ASSOCIATION:
4817                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
4818                             (void *)stcb);
4819                         *offset = length;
4820                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
4821                                 if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) {
4822                                         return (NULL);
4823                                 } else {
4824                                         return (stcb);
4825                                 }
4826                         } else {
4827                                 return (NULL);
4828                         }
4829                         break;
4830                 case SCTP_SHUTDOWN:
4831                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
4832                             (void *)stcb);
4833                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
4834                                 break;
4835                         }
4836                         if ((netp != NULL) && (*netp != NULL)) {
4837                                 abort_flag = 0;
4838                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
4839                                     stcb, *netp, &abort_flag);
4840                                 if (abort_flag) {
4841                                         *offset = length;
4842                                         return (NULL);
4843                                 }
4844                         }
4845                         break;
4846                 case SCTP_SHUTDOWN_ACK:
4847                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb);
4848                         if ((chk_length == sizeof(struct sctp_shutdown_ack_chunk)) &&
4849                             (stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
4850                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
4851                                 *offset = length;
4852                                 return (NULL);
4853                         }
4854                         break;
4855                 case SCTP_OPERATION_ERROR:
4856                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n");
4857                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) &&
4858                             sctp_handle_error(ch, stcb, *netp, contiguous) < 0) {
4859                                 *offset = length;
4860                                 return (NULL);
4861                         }
4862                         break;
4863                 case SCTP_COOKIE_ECHO:
4864                         SCTPDBG(SCTP_DEBUG_INPUT3,
4865                             "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb);
4866                         if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) {
4867                                 ;
4868                         } else {
4869                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4870                                         /* We are not interested anymore */
4871                         abend:
4872                                         if (stcb != NULL) {
4873                                                 SCTP_TCB_UNLOCK(stcb);
4874                                         }
4875                                         *offset = length;
4876                                         return (NULL);
4877                                 }
4878                         }
4879                         /*-
4880                          * First are we accepting? We do this again here
4881                          * since it is possible that a previous endpoint WAS
4882                          * listening responded to a INIT-ACK and then
4883                          * closed. We opened and bound.. and are now no
4884                          * longer listening.
4885                          *
4886                          * XXXGL: notes on checking listen queue length.
4887                          * 1) SCTP_IS_LISTENING() doesn't necessarily mean
4888                          *    SOLISTENING(), because a listening "UDP type"
4889                          *    socket isn't listening in terms of the socket
4890                          *    layer.  It is a normal data flow socket, that
4891                          *    can fork off new connections.  Thus, we should
4892                          *    look into sol_qlen only in case we are !UDP.
4893                          * 2) Checking sol_qlen in general requires locking
4894                          *    the socket, and this code lacks that.
4895                          */
4896                         if ((stcb == NULL) &&
4897                             (!SCTP_IS_LISTENING(inp) ||
4898                             (!(inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) &&
4899                             inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) {
4900                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
4901                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
4902                                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4903                                         sctp_abort_association(inp, stcb, m, iphlen,
4904                                             src, dst, sh, op_err,
4905                                             mflowtype, mflowid,
4906                                             vrf_id, port);
4907                                 }
4908                                 *offset = length;
4909                                 return (NULL);
4910                         } else {
4911                                 struct mbuf *ret_buf;
4912                                 struct sctp_inpcb *linp;
4913                                 struct sctp_tmit_chunk *chk;
4914
4915                                 if (stcb) {
4916                                         linp = NULL;
4917                                 } else {
4918                                         linp = inp;
4919                                 }
4920
4921                                 if (linp != NULL) {
4922                                         SCTP_ASOC_CREATE_LOCK(linp);
4923                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
4924                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
4925                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
4926                                                 goto abend;
4927                                         }
4928                                 }
4929
4930                                 if (netp != NULL) {
4931                                         struct sctp_tcb *locked_stcb;
4932
4933                                         locked_stcb = stcb;
4934                                         ret_buf =
4935                                             sctp_handle_cookie_echo(m, iphlen,
4936                                             *offset,
4937                                             src, dst,
4938                                             sh,
4939                                             (struct sctp_cookie_echo_chunk *)ch,
4940                                             &inp, &stcb, netp,
4941                                             auth_skipped,
4942                                             auth_offset,
4943                                             auth_len,
4944                                             &locked_stcb,
4945                                             mflowtype,
4946                                             mflowid,
4947                                             vrf_id,
4948                                             port);
4949                                         if ((locked_stcb != NULL) && (locked_stcb != stcb)) {
4950                                                 SCTP_TCB_UNLOCK(locked_stcb);
4951                                         }
4952                                         if (stcb != NULL) {
4953                                                 SCTP_TCB_LOCK_ASSERT(stcb);
4954                                         }
4955                                 } else {
4956                                         ret_buf = NULL;
4957                                 }
4958                                 if (linp != NULL) {
4959                                         SCTP_ASOC_CREATE_UNLOCK(linp);
4960                                 }
4961                                 if (ret_buf == NULL) {
4962                                         if (stcb != NULL) {
4963                                                 SCTP_TCB_UNLOCK(stcb);
4964                                         }
4965                                         SCTPDBG(SCTP_DEBUG_INPUT3,
4966                                             "GAK, null buffer\n");
4967                                         *offset = length;
4968                                         return (NULL);
4969                                 }
4970                                 /* if AUTH skipped, see if it verified... */
4971                                 if (auth_skipped) {
4972                                         got_auth = 1;
4973                                         auth_skipped = 0;
4974                                 }
4975                                 /* Restart the timer if we have pending data */
4976                                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
4977                                         if (chk->whoTo != NULL) {
4978                                                 break;
4979                                         }
4980                                 }
4981                                 if (chk != NULL) {
4982                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
4983                                 }
4984                         }
4985                         break;
4986                 case SCTP_COOKIE_ACK:
4987                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb);
4988                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
4989                                 break;
4990                         }
4991                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4992                                 /* We are not interested anymore */
4993                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4994                                         ;
4995                                 } else if (stcb) {
4996                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
4997                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
4998                                         *offset = length;
4999                                         return (NULL);
5000                                 }
5001                         }
5002                         if ((netp != NULL) && (*netp != NULL)) {
5003                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
5004                         }
5005                         break;
5006                 case SCTP_ECN_ECHO:
5007                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n");
5008                         if (stcb == NULL) {
5009                                 break;
5010                         }
5011                         if (stcb->asoc.ecn_supported == 0) {
5012                                 goto unknown_chunk;
5013                         }
5014                         if ((chk_length != sizeof(struct sctp_ecne_chunk)) &&
5015                             (chk_length != sizeof(struct old_sctp_ecne_chunk))) {
5016                                 break;
5017                         }
5018                         sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb);
5019                         ecne_seen = 1;
5020                         break;
5021                 case SCTP_ECN_CWR:
5022                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n");
5023                         if (stcb == NULL) {
5024                                 break;
5025                         }
5026                         if (stcb->asoc.ecn_supported == 0) {
5027                                 goto unknown_chunk;
5028                         }
5029                         if (chk_length != sizeof(struct sctp_cwr_chunk)) {
5030                                 break;
5031                         }
5032                         sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5033                         break;
5034                 case SCTP_SHUTDOWN_COMPLETE:
5035                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb);
5036                         /* must be first and only chunk */
5037                         if ((num_chunks > 1) ||
5038                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5039                                 *offset = length;
5040                                 return (stcb);
5041                         }
5042                         if ((chk_length == sizeof(struct sctp_shutdown_complete_chunk)) &&
5043                             (stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5044                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5045                                     stcb, *netp);
5046                                 *offset = length;
5047                                 return (NULL);
5048                         }
5049                         break;
5050                 case SCTP_ASCONF:
5051                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5052                         if (stcb != NULL) {
5053                                 if (stcb->asoc.asconf_supported == 0) {
5054                                         goto unknown_chunk;
5055                                 }
5056                                 sctp_handle_asconf(m, *offset, src,
5057                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5058                                 asconf_cnt++;
5059                         }
5060                         break;
5061                 case SCTP_ASCONF_ACK:
5062                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n");
5063                         if (stcb == NULL) {
5064                                 break;
5065                         }
5066                         if (stcb->asoc.asconf_supported == 0) {
5067                                 goto unknown_chunk;
5068                         }
5069                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5070                                 break;
5071                         }
5072                         if ((netp != NULL) && (*netp != NULL)) {
5073                                 /* He's alive so give him credit */
5074                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5075                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5076                                             stcb->asoc.overall_error_count,
5077                                             0,
5078                                             SCTP_FROM_SCTP_INPUT,
5079                                             __LINE__);
5080                                 }
5081                                 stcb->asoc.overall_error_count = 0;
5082                                 sctp_handle_asconf_ack(m, *offset,
5083                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5084                                 if (abort_no_unlock)
5085                                         return (NULL);
5086                         }
5087                         break;
5088                 case SCTP_FORWARD_CUM_TSN:
5089                 case SCTP_IFORWARD_CUM_TSN:
5090                         SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n",
5091                             ch->chunk_type == SCTP_FORWARD_CUM_TSN ? "FORWARD_TSN" : "I_FORWARD_TSN");
5092                         if (stcb == NULL) {
5093                                 break;
5094                         }
5095                         if (stcb->asoc.prsctp_supported == 0) {
5096                                 goto unknown_chunk;
5097                         }
5098                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5099                                 break;
5100                         }
5101                         if (((stcb->asoc.idata_supported == 1) && (ch->chunk_type == SCTP_FORWARD_CUM_TSN)) ||
5102                             ((stcb->asoc.idata_supported == 0) && (ch->chunk_type == SCTP_IFORWARD_CUM_TSN))) {
5103                                 if (ch->chunk_type == SCTP_FORWARD_CUM_TSN) {
5104                                         SCTP_SNPRINTF(msg, sizeof(msg), "%s", "FORWARD-TSN chunk received when I-FORWARD-TSN was negotiated");
5105                                 } else {
5106                                         SCTP_SNPRINTF(msg, sizeof(msg), "%s", "I-FORWARD-TSN chunk received when FORWARD-TSN was negotiated");
5107                                 }
5108                                 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
5109                                 sctp_abort_an_association(inp, stcb, op_err, false, SCTP_SO_NOT_LOCKED);
5110                                 *offset = length;
5111                                 return (NULL);
5112                         }
5113                         *fwd_tsn_seen = 1;
5114                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5115                                 /* We are not interested anymore */
5116                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5117                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_31);
5118                                 *offset = length;
5119                                 return (NULL);
5120                         }
5121                         /*
5122                          * For sending a SACK this looks like DATA chunks.
5123                          */
5124                         stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from;
5125                         abort_flag = 0;
5126                         sctp_handle_forward_tsn(stcb,
5127                             (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5128                         if (abort_flag) {
5129                                 *offset = length;
5130                                 return (NULL);
5131                         }
5132                         break;
5133                 case SCTP_STREAM_RESET:
5134                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5135                         if (stcb == NULL) {
5136                                 break;
5137                         }
5138                         if (stcb->asoc.reconfig_supported == 0) {
5139                                 goto unknown_chunk;
5140                         }
5141                         if (chk_length < sizeof(struct sctp_stream_reset_tsn_req)) {
5142                                 break;
5143                         }
5144                         if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5145                                 /* stop processing */
5146                                 *offset = length;
5147                                 return (NULL);
5148                         }
5149                         break;
5150                 case SCTP_PACKET_DROPPED:
5151                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5152                         if (stcb == NULL) {
5153                                 break;
5154                         }
5155                         if (stcb->asoc.pktdrop_supported == 0) {
5156                                 goto unknown_chunk;
5157                         }
5158                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5159                                 break;
5160                         }
5161                         if ((netp != NULL) && (*netp != NULL)) {
5162                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5163                                     stcb, *netp,
5164                                     min(chk_length, contiguous));
5165                         }
5166                         break;
5167                 case SCTP_AUTHENTICATION:
5168                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5169                         if (stcb == NULL) {
5170                                 /* save the first AUTH for later processing */
5171                                 if (auth_skipped == 0) {
5172                                         auth_offset = *offset;
5173                                         auth_len = chk_length;
5174                                         auth_skipped = 1;
5175                                 }
5176                                 /* skip this chunk (temporarily) */
5177                                 break;
5178                         }
5179                         if (stcb->asoc.auth_supported == 0) {
5180                                 goto unknown_chunk;
5181                         }
5182                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5183                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5184                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5185                                 /* Its not ours */
5186                                 *offset = length;
5187                                 return (stcb);
5188                         }
5189                         if (got_auth == 1) {
5190                                 /* skip this chunk... it's already auth'd */
5191                                 break;
5192                         }
5193                         got_auth = 1;
5194                         if (sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, m, *offset)) {
5195                                 /* auth HMAC failed so dump the packet */
5196                                 *offset = length;
5197                                 return (stcb);
5198                         } else {
5199                                 /* remaining chunks are HMAC checked */
5200                                 stcb->asoc.authenticated = 1;
5201                         }
5202                         break;
5203
5204                 default:
5205         unknown_chunk:
5206                         /* it's an unknown chunk! */
5207                         if ((ch->chunk_type & 0x40) &&
5208                             (stcb != NULL) &&
5209                             (SCTP_GET_STATE(stcb) != SCTP_STATE_EMPTY) &&
5210                             (SCTP_GET_STATE(stcb) != SCTP_STATE_INUSE) &&
5211                             (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) {
5212                                 struct sctp_gen_error_cause *cause;
5213                                 int len;
5214
5215                                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause),
5216                                     0, M_NOWAIT, 1, MT_DATA);
5217                                 if (op_err != NULL) {
5218                                         len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset));
5219                                         cause = mtod(op_err, struct sctp_gen_error_cause *);
5220                                         cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5221                                         cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause)));
5222                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5223                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
5224                                         if (SCTP_BUF_NEXT(op_err) != NULL) {
5225 #ifdef SCTP_MBUF_LOGGING
5226                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5227                                                         sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY);
5228                                                 }
5229 #endif
5230                                                 sctp_queue_op_err(stcb, op_err);
5231                                         } else {
5232                                                 sctp_m_freem(op_err);
5233                                         }
5234                                 }
5235                         }
5236                         if ((ch->chunk_type & 0x80) == 0) {
5237                                 /* discard this packet */
5238                                 *offset = length;
5239                                 return (stcb);
5240                         }       /* else skip this bad chunk and continue... */
5241                         break;
5242                 }               /* switch (ch->chunk_type) */
5243
5244 next_chunk:
5245                 /* get the next chunk */
5246                 *offset += SCTP_SIZE32(chk_length);
5247                 if (*offset >= length) {
5248                         /* no more data left in the mbuf chain */
5249                         break;
5250                 }
5251                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5252                     sizeof(struct sctp_chunkhdr), chunk_buf);
5253                 if (ch == NULL) {
5254                         *offset = length;
5255                         return (stcb);
5256                 }
5257         }                       /* while */
5258
5259         if ((asconf_cnt > 0) && (stcb != NULL)) {
5260                 sctp_send_asconf_ack(stcb);
5261         }
5262         return (stcb);
5263 }
5264
5265 /*
5266  * common input chunk processing (v4 and v6)
5267  */
5268 void
5269 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5270     struct sockaddr *src, struct sockaddr *dst,
5271     struct sctphdr *sh, struct sctp_chunkhdr *ch,
5272     uint8_t compute_crc,
5273     uint8_t ecn_bits,
5274     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
5275     uint32_t vrf_id, uint16_t port)
5276 {
5277         uint32_t high_tsn;
5278         int fwd_tsn_seen = 0, data_processed = 0;
5279         struct mbuf *m = *mm, *op_err;
5280         char msg[SCTP_DIAG_INFO_LEN];
5281         int un_sent;
5282         int cnt_ctrl_ready = 0;
5283         struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5284         struct sctp_tcb *stcb = NULL;
5285         struct sctp_nets *net = NULL;
5286
5287         SCTP_STAT_INCR(sctps_recvdatagrams);
5288 #ifdef SCTP_AUDITING_ENABLED
5289         sctp_audit_log(0xE0, 1);
5290         sctp_auditing(0, inp, stcb, net);
5291 #endif
5292         if (compute_crc != 0) {
5293                 uint32_t check, calc_check;
5294
5295                 check = sh->checksum;
5296                 sh->checksum = 0;
5297                 calc_check = sctp_calculate_cksum(m, iphlen);
5298                 sh->checksum = check;
5299                 if (calc_check != check) {
5300                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5301                             calc_check, check, (void *)m, length, iphlen);
5302                         stcb = sctp_findassociation_addr(m, offset, src, dst,
5303                             sh, ch, &inp, &net, vrf_id);
5304 #if defined(INET) || defined(INET6)
5305                         if ((ch->chunk_type != SCTP_INITIATION) &&
5306                             (net != NULL) && (net->port != port)) {
5307                                 if (net->port == 0) {
5308                                         /* UDP encapsulation turned on. */
5309                                         net->mtu -= sizeof(struct udphdr);
5310                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5311                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5312                                         }
5313                                 } else if (port == 0) {
5314                                         /* UDP encapsulation turned off. */
5315                                         net->mtu += sizeof(struct udphdr);
5316                                         /* XXX Update smallest_mtu */
5317                                 }
5318                                 net->port = port;
5319                         }
5320 #endif
5321                         if (net != NULL) {
5322                                 net->flowtype = mflowtype;
5323                                 net->flowid = mflowid;
5324                         }
5325                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5326                         if ((inp != NULL) && (stcb != NULL)) {
5327                                 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5328                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5329                         } else if ((inp != NULL) && (stcb == NULL)) {
5330                                 inp_decr = inp;
5331                         }
5332                         SCTP_STAT_INCR(sctps_badsum);
5333                         SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5334                         goto out;
5335                 }
5336         }
5337         /* Destination port of 0 is illegal, based on RFC4960. */
5338         if (sh->dest_port == 0) {
5339                 SCTP_STAT_INCR(sctps_hdrops);
5340                 goto out;
5341         }
5342         stcb = sctp_findassociation_addr(m, offset, src, dst,
5343             sh, ch, &inp, &net, vrf_id);
5344 #if defined(INET) || defined(INET6)
5345         if ((ch->chunk_type != SCTP_INITIATION) &&
5346             (net != NULL) && (net->port != port)) {
5347                 if (net->port == 0) {
5348                         /* UDP encapsulation turned on. */
5349                         net->mtu -= sizeof(struct udphdr);
5350                         if (stcb->asoc.smallest_mtu > net->mtu) {
5351                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5352                         }
5353                 } else if (port == 0) {
5354                         /* UDP encapsulation turned off. */
5355                         net->mtu += sizeof(struct udphdr);
5356                         /* XXX Update smallest_mtu */
5357                 }
5358                 net->port = port;
5359         }
5360 #endif
5361         if (net != NULL) {
5362                 net->flowtype = mflowtype;
5363                 net->flowid = mflowid;
5364         }
5365         if (inp == NULL) {
5366                 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5367                 SCTP_STAT_INCR(sctps_noport);
5368                 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5369                         goto out;
5370                 }
5371                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5372                         sctp_send_shutdown_complete2(src, dst, sh,
5373                             mflowtype, mflowid, fibnum,
5374                             vrf_id, port);
5375                         goto out;
5376                 }
5377                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5378                         goto out;
5379                 }
5380                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5381                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5382                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5383                             (ch->chunk_type != SCTP_INIT))) {
5384                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5385                                     "Out of the blue");
5386                                 sctp_send_abort(m, iphlen, src, dst,
5387                                     sh, 0, op_err,
5388                                     mflowtype, mflowid, fibnum,
5389                                     vrf_id, port);
5390                         }
5391                 }
5392                 goto out;
5393         } else if (stcb == NULL) {
5394                 inp_decr = inp;
5395         }
5396         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5397             (void *)m, iphlen, offset, length, (void *)stcb);
5398         if (stcb) {
5399                 /* always clear this before beginning a packet */
5400                 stcb->asoc.authenticated = 0;
5401                 stcb->asoc.seen_a_sack_this_pkt = 0;
5402                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5403                     (void *)stcb, stcb->asoc.state);
5404
5405                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5406                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5407                         /*-
5408                          * If we hit here, we had a ref count
5409                          * up when the assoc was aborted and the
5410                          * timer is clearing out the assoc, we should
5411                          * NOT respond to any packet.. its OOTB.
5412                          */
5413                         SCTP_TCB_UNLOCK(stcb);
5414                         stcb = NULL;
5415                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5416                         SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5417                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5418                             msg);
5419                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5420                             mflowtype, mflowid, inp->fibnum,
5421                             vrf_id, port);
5422                         goto out;
5423                 }
5424         }
5425         if (IS_SCTP_CONTROL(ch)) {
5426                 /* process the control portion of the SCTP packet */
5427                 /* sa_ignore NO_NULL_CHK */
5428                 stcb = sctp_process_control(m, iphlen, &offset, length,
5429                     src, dst, sh, ch,
5430                     inp, stcb, &net, &fwd_tsn_seen,
5431                     mflowtype, mflowid, fibnum,
5432                     vrf_id, port);
5433                 if (stcb) {
5434                         /*
5435                          * This covers us if the cookie-echo was there and
5436                          * it changes our INP.
5437                          */
5438                         inp = stcb->sctp_ep;
5439 #if defined(INET) || defined(INET6)
5440                         if ((ch->chunk_type != SCTP_INITIATION) &&
5441                             (net != NULL) && (net->port != port)) {
5442                                 if (net->port == 0) {
5443                                         /* UDP encapsulation turned on. */
5444                                         net->mtu -= sizeof(struct udphdr);
5445                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5446                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5447                                         }
5448                                 } else if (port == 0) {
5449                                         /* UDP encapsulation turned off. */
5450                                         net->mtu += sizeof(struct udphdr);
5451                                         /* XXX Update smallest_mtu */
5452                                 }
5453                                 net->port = port;
5454                         }
5455 #endif
5456                 }
5457         } else {
5458                 /*
5459                  * no control chunks, so pre-process DATA chunks (these
5460                  * checks are taken care of by control processing)
5461                  */
5462
5463                 /*
5464                  * if DATA only packet, and auth is required, then punt...
5465                  * can't have authenticated without any AUTH (control)
5466                  * chunks
5467                  */
5468                 if ((stcb != NULL) &&
5469                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5470                         /* "silently" ignore */
5471                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5472                         SCTP_STAT_INCR(sctps_recvauthmissing);
5473                         goto out;
5474                 }
5475                 if (stcb == NULL) {
5476                         /* out of the blue DATA chunk */
5477                         SCTP_PROBE5(receive, NULL, NULL, m, NULL, sh);
5478                         SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5479                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5480                             msg);
5481                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5482                             mflowtype, mflowid, fibnum,
5483                             vrf_id, port);
5484                         goto out;
5485                 }
5486                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5487                         /* v_tag mismatch! */
5488                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5489                         SCTP_STAT_INCR(sctps_badvtag);
5490                         goto out;
5491                 }
5492         }
5493
5494         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5495         if (stcb == NULL) {
5496                 /*
5497                  * no valid TCB for this packet, or we found it's a bad
5498                  * packet while processing control, or we're done with this
5499                  * packet (done or skip rest of data), so we drop it...
5500                  */
5501                 goto out;
5502         }
5503
5504         /*
5505          * DATA chunk processing
5506          */
5507         /* plow through the data chunks while length > offset */
5508
5509         /*
5510          * Rest should be DATA only.  Check authentication state if AUTH for
5511          * DATA is required.
5512          */
5513         if ((length > offset) &&
5514             (stcb != NULL) &&
5515             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5516             !stcb->asoc.authenticated) {
5517                 /* "silently" ignore */
5518                 SCTP_STAT_INCR(sctps_recvauthmissing);
5519                 SCTPDBG(SCTP_DEBUG_AUTH1,
5520                     "Data chunk requires AUTH, skipped\n");
5521                 goto trigger_send;
5522         }
5523         if (length > offset) {
5524                 int retval;
5525
5526                 /*
5527                  * First check to make sure our state is correct. We would
5528                  * not get here unless we really did have a tag, so we don't
5529                  * abort if this happens, just dump the chunk silently.
5530                  */
5531                 switch (SCTP_GET_STATE(stcb)) {
5532                 case SCTP_STATE_COOKIE_ECHOED:
5533                         /*
5534                          * we consider data with valid tags in this state
5535                          * shows us the cookie-ack was lost. Imply it was
5536                          * there.
5537                          */
5538                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5539                         break;
5540                 case SCTP_STATE_COOKIE_WAIT:
5541                         /*
5542                          * We consider OOTB any data sent during asoc setup.
5543                          */
5544                         SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5545                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5546                             msg);
5547                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5548                             mflowtype, mflowid, inp->fibnum,
5549                             vrf_id, port);
5550                         goto out;
5551                         /* sa_ignore NOTREACHED */
5552                         break;
5553                 case SCTP_STATE_EMPTY:  /* should not happen */
5554                 case SCTP_STATE_INUSE:  /* should not happen */
5555                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5556                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5557                 default:
5558                         goto out;
5559                         /* sa_ignore NOTREACHED */
5560                         break;
5561                 case SCTP_STATE_OPEN:
5562                 case SCTP_STATE_SHUTDOWN_SENT:
5563                         break;
5564                 }
5565                 /* plow through the data chunks while length > offset */
5566                 retval = sctp_process_data(mm, iphlen, &offset, length,
5567                     inp, stcb, net, &high_tsn);
5568                 if (retval == 2) {
5569                         /*
5570                          * The association aborted, NO UNLOCK needed since
5571                          * the association is destroyed.
5572                          */
5573                         stcb = NULL;
5574                         goto out;
5575                 }
5576                 if (retval == 0) {
5577                         data_processed = 1;
5578                 }
5579                 /*
5580                  * Anything important needs to have been m_copy'ed in
5581                  * process_data
5582                  */
5583         }
5584
5585         /* take care of ecn */
5586         if ((data_processed == 1) &&
5587             (stcb->asoc.ecn_supported == 1) &&
5588             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5589                 /* Yep, we need to add a ECNE */
5590                 sctp_send_ecn_echo(stcb, net, high_tsn);
5591         }
5592
5593         if ((data_processed == 0) && (fwd_tsn_seen)) {
5594                 int was_a_gap;
5595                 uint32_t highest_tsn;
5596
5597                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
5598                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
5599                 } else {
5600                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
5601                 }
5602                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
5603                 stcb->asoc.send_sack = 1;
5604                 sctp_sack_check(stcb, was_a_gap);
5605         } else if (fwd_tsn_seen) {
5606                 stcb->asoc.send_sack = 1;
5607         }
5608         /* trigger send of any chunks in queue... */
5609 trigger_send:
5610 #ifdef SCTP_AUDITING_ENABLED
5611         sctp_audit_log(0xE0, 2);
5612         sctp_auditing(1, inp, stcb, net);
5613 #endif
5614         SCTPDBG(SCTP_DEBUG_INPUT1,
5615             "Check for chunk output prw:%d tqe:%d tf=%d\n",
5616             stcb->asoc.peers_rwnd,
5617             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
5618             stcb->asoc.total_flight);
5619         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
5620         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
5621                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
5622         }
5623         if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) ||
5624             cnt_ctrl_ready ||
5625             stcb->asoc.trigger_reset ||
5626             ((un_sent > 0) &&
5627             (stcb->asoc.peers_rwnd > 0 || stcb->asoc.total_flight == 0))) {
5628                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
5629                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5630                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
5631         }
5632 #ifdef SCTP_AUDITING_ENABLED
5633         sctp_audit_log(0xE0, 3);
5634         sctp_auditing(2, inp, stcb, net);
5635 #endif
5636 out:
5637         if (stcb != NULL) {
5638                 SCTP_TCB_UNLOCK(stcb);
5639         }
5640         if (inp_decr != NULL) {
5641                 /* reduce ref-count */
5642                 SCTP_INP_WLOCK(inp_decr);
5643                 SCTP_INP_DECR_REF(inp_decr);
5644                 SCTP_INP_WUNLOCK(inp_decr);
5645         }
5646         return;
5647 }
5648
5649 #ifdef INET
5650 void
5651 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
5652 {
5653         struct mbuf *m;
5654         int iphlen;
5655         uint32_t vrf_id = 0;
5656         uint8_t ecn_bits;
5657         struct sockaddr_in src, dst;
5658         struct ip *ip;
5659         struct sctphdr *sh;
5660         struct sctp_chunkhdr *ch;
5661         int length, offset;
5662         uint8_t compute_crc;
5663         uint32_t mflowid;
5664         uint8_t mflowtype;
5665         uint16_t fibnum;
5666
5667         iphlen = off;
5668         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
5669                 SCTP_RELEASE_PKT(i_pak);
5670                 return;
5671         }
5672         m = SCTP_HEADER_TO_CHAIN(i_pak);
5673 #ifdef SCTP_MBUF_LOGGING
5674         /* Log in any input mbufs */
5675         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5676                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
5677         }
5678 #endif
5679 #ifdef SCTP_PACKET_LOGGING
5680         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
5681                 sctp_packet_log(m);
5682         }
5683 #endif
5684         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
5685             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
5686             m->m_pkthdr.len,
5687             if_name(m->m_pkthdr.rcvif),
5688             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
5689         mflowid = m->m_pkthdr.flowid;
5690         mflowtype = M_HASHTYPE_GET(m);
5691         fibnum = M_GETFIB(m);
5692         SCTP_STAT_INCR(sctps_recvpackets);
5693         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
5694         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
5695         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5696         if (SCTP_BUF_LEN(m) < offset) {
5697                 if ((m = m_pullup(m, offset)) == NULL) {
5698                         SCTP_STAT_INCR(sctps_hdrops);
5699                         return;
5700                 }
5701         }
5702         ip = mtod(m, struct ip *);
5703         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
5704         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
5705         offset -= sizeof(struct sctp_chunkhdr);
5706         memset(&src, 0, sizeof(struct sockaddr_in));
5707         src.sin_family = AF_INET;
5708         src.sin_len = sizeof(struct sockaddr_in);
5709         src.sin_port = sh->src_port;
5710         src.sin_addr = ip->ip_src;
5711         memset(&dst, 0, sizeof(struct sockaddr_in));
5712         dst.sin_family = AF_INET;
5713         dst.sin_len = sizeof(struct sockaddr_in);
5714         dst.sin_port = sh->dest_port;
5715         dst.sin_addr = ip->ip_dst;
5716         length = ntohs(ip->ip_len);
5717         /* Validate mbuf chain length with IP payload length. */
5718         if (SCTP_HEADER_LEN(m) != length) {
5719                 SCTPDBG(SCTP_DEBUG_INPUT1,
5720                     "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
5721                 SCTP_STAT_INCR(sctps_hdrops);
5722                 goto out;
5723         }
5724         /* SCTP does not allow broadcasts or multicasts */
5725         if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
5726                 goto out;
5727         }
5728         if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
5729                 goto out;
5730         }
5731         ecn_bits = ip->ip_tos;
5732         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
5733                 SCTP_STAT_INCR(sctps_recvhwcrc);
5734                 compute_crc = 0;
5735         } else {
5736                 SCTP_STAT_INCR(sctps_recvswcrc);
5737                 compute_crc = 1;
5738         }
5739         sctp_common_input_processing(&m, iphlen, offset, length,
5740             (struct sockaddr *)&src,
5741             (struct sockaddr *)&dst,
5742             sh, ch,
5743             compute_crc,
5744             ecn_bits,
5745             mflowtype, mflowid, fibnum,
5746             vrf_id, port);
5747 out:
5748         if (m) {
5749                 sctp_m_freem(m);
5750         }
5751         return;
5752 }
5753
5754 #if defined(SCTP_MCORE_INPUT) && defined(SMP)
5755 extern int *sctp_cpuarry;
5756 #endif
5757
5758 int
5759 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED)
5760 {
5761         struct mbuf *m;
5762         int off;
5763
5764         m = *mp;
5765         off = *offp;
5766 #if defined(SCTP_MCORE_INPUT) && defined(SMP)
5767         if (mp_ncpus > 1) {
5768                 struct ip *ip;
5769                 struct sctphdr *sh;
5770                 int offset;
5771                 int cpu_to_use;
5772                 uint32_t flowid, tag;
5773
5774                 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
5775                         flowid = m->m_pkthdr.flowid;
5776                 } else {
5777                         /*
5778                          * No flow id built by lower layers fix it so we
5779                          * create one.
5780                          */
5781                         offset = off + sizeof(struct sctphdr);
5782                         if (SCTP_BUF_LEN(m) < offset) {
5783                                 if ((m = m_pullup(m, offset)) == NULL) {
5784                                         SCTP_STAT_INCR(sctps_hdrops);
5785                                         return (IPPROTO_DONE);
5786                                 }
5787                         }
5788                         ip = mtod(m, struct ip *);
5789                         sh = (struct sctphdr *)((caddr_t)ip + off);
5790                         tag = htonl(sh->v_tag);
5791                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
5792                         m->m_pkthdr.flowid = flowid;
5793                         M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH);
5794                 }
5795                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
5796                 sctp_queue_to_mcore(m, off, cpu_to_use);
5797                 return (IPPROTO_DONE);
5798         }
5799 #endif
5800         sctp_input_with_port(m, off, 0);
5801         return (IPPROTO_DONE);
5802 }
5803 #endif