sys/netinet/sctp_input.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   5  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   6  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  * a) Redistributions of source code must retain the above copyright notice,
  12  *    this list of conditions and the following disclaimer.
  13  *
  14  * b) Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the distribution.
  17  *
  18  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  19  *    contributors may be used to endorse or promote products derived
  20  *    from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  24  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  32  * THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 __FBSDID("$FreeBSD$");
  37
  38 #include <netinet/sctp_os.h>
  39 #include <netinet/sctp_var.h>
  40 #include <netinet/sctp_sysctl.h>
  41 #include <netinet/sctp_pcb.h>
  42 #include <netinet/sctp_header.h>
  43 #include <netinet/sctputil.h>
  44 #include <netinet/sctp_output.h>
  45 #include <netinet/sctp_input.h>
  46 #include <netinet/sctp_auth.h>
  47 #include <netinet/sctp_indata.h>
  48 #include <netinet/sctp_asconf.h>
  49 #include <netinet/sctp_bsd_addr.h>
  50 #include <netinet/sctp_timer.h>
  51 #include <netinet/sctp_crc32.h>
  52 #include <netinet/sctp_kdtrace.h>
  53 #if defined(INET) || defined(INET6)
  54 #include <netinet/udp.h>
  55 #endif
  56 #include <sys/smp.h>
  57
  58 static void
  59 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb)
  60 {
  61         struct sctp_nets *net;
  62
  63         /*
  64          * This now not only stops all cookie timers it also stops any INIT
  65          * timers as well. This will make sure that the timers are stopped
  66          * in all collision cases.
  67          */
  68         SCTP_TCB_LOCK_ASSERT(stcb);
  69         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
  70                 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) {
  71                         sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE,
  72                             stcb->sctp_ep,
  73                             stcb,
  74                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1);
  75                 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) {
  76                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT,
  77                             stcb->sctp_ep,
  78                             stcb,
  79                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2);
  80                 }
  81         }
  82 }
  83
  84 /* INIT handler */
  85 static void
  86 sctp_handle_init(struct mbuf *m, int iphlen, int offset,
  87     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
  88     struct sctp_init_chunk *cp, struct sctp_inpcb *inp,
  89     struct sctp_tcb *stcb, struct sctp_nets *net,
  90     uint8_t mflowtype, uint32_t mflowid,
  91     uint32_t vrf_id, uint16_t port)
  92 {
  93         struct sctp_init *init;
  94         struct mbuf *op_err;
  95
  96         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
  97             (void *)stcb);
  98         if (stcb == NULL) {
  99                 SCTP_INP_RLOCK(inp);
 100         }
 101         /* Validate parameters */
 102         init = &cp->init;
 103         if (ntohl(init->initiate_tag) == 0) {
 104                 goto outnow;
 105         }
 106         if ((ntohl(init->a_rwnd) < SCTP_MIN_RWND) ||
 107             (ntohs(init->num_inbound_streams) == 0) ||
 108             (ntohs(init->num_outbound_streams) == 0)) {
 109                 /* protocol error... send abort */
 110                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 111                 sctp_send_abort(m, iphlen, src, dst, sh, init->initiate_tag, op_err,
 112                     mflowtype, mflowid, inp->fibnum,
 113                     vrf_id, port);
 114                 goto outnow;
 115         }
 116         if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
 117             offset + ntohs(cp->ch.chunk_length))) {
 118                 /* auth parameter(s) error... send abort */
 119                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 120                     "Problem with AUTH parameters");
 121                 sctp_send_abort(m, iphlen, src, dst, sh, init->initiate_tag, op_err,
 122                     mflowtype, mflowid, inp->fibnum,
 123                     vrf_id, port);
 124                 goto outnow;
 125         }
 126         /* We are only accepting if we have a listening socket. */
 127         if ((stcb == NULL) &&
 128             ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
 129             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
 130             (!SCTP_IS_LISTENING(inp)))) {
 131                 /*
 132                  * FIX ME ?? What about TCP model and we have a
 133                  * match/restart case? Actually no fix is needed. the lookup
 134                  * will always find the existing assoc so stcb would not be
 135                  * NULL. It may be questionable to do this since we COULD
 136                  * just send back the INIT-ACK and hope that the app did
 137                  * accept()'s by the time the COOKIE was sent. But there is
 138                  * a price to pay for COOKIE generation and I don't want to
 139                  * pay it on the chance that the app will actually do some
 140                  * accepts(). The App just looses and should NOT be in this
 141                  * state :-)
 142                  */
 143                 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) {
 144                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 145                             "No listener");
 146                         sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
 147                             mflowtype, mflowid, inp->fibnum,
 148                             vrf_id, port);
 149                 }
 150                 goto outnow;
 151         }
 152         if ((stcb != NULL) &&
 153             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 154                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n");
 155                 sctp_send_shutdown_ack(stcb, NULL);
 156                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
 157         } else {
 158                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
 159                 sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset,
 160                     src, dst, sh, cp,
 161                     mflowtype, mflowid,
 162                     vrf_id, port);
 163         }
 164 outnow:
 165         if (stcb == NULL) {
 166                 SCTP_INP_RUNLOCK(inp);
 167         }
 168 }
 169
 170 /*
 171  * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
 172  */
 173
 174 int
 175 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked)
 176 {
 177         int unsent_data;
 178         unsigned int i;
 179         struct sctp_stream_queue_pending *sp;
 180         struct sctp_association *asoc;
 181
 182         /*
 183          * This function returns if any stream has true unsent data on it.
 184          * Note that as it looks through it will clean up any places that
 185          * have old data that has been sent but left at top of stream queue.
 186          */
 187         asoc = &stcb->asoc;
 188         unsent_data = 0;
 189         SCTP_TCB_SEND_LOCK(stcb);
 190         if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
 191                 /* Check to see if some data queued */
 192                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 193                         /* sa_ignore FREED_MEMORY */
 194                         sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
 195                         if (sp == NULL) {
 196                                 continue;
 197                         }
 198                         if ((sp->msg_is_complete) &&
 199                             (sp->length == 0) &&
 200                             (sp->sender_all_done)) {
 201                                 /*
 202                                  * We are doing differed cleanup. Last time
 203                                  * through when we took all the data the
 204                                  * sender_all_done was not set.
 205                                  */
 206                                 if (sp->put_last_out == 0) {
 207                                         SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
 208                                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
 209                                             sp->sender_all_done,
 210                                             sp->length,
 211                                             sp->msg_is_complete,
 212                                             sp->put_last_out);
 213                                 }
 214                                 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 215                                 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
 216                                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp);
 217                                 if (sp->net) {
 218                                         sctp_free_remote_addr(sp->net);
 219                                         sp->net = NULL;
 220                                 }
 221                                 if (sp->data) {
 222                                         sctp_m_freem(sp->data);
 223                                         sp->data = NULL;
 224                                 }
 225                                 sctp_free_a_strmoq(stcb, sp, so_locked);
 226                                 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
 227                                         unsent_data++;
 228                                 }
 229                         } else {
 230                                 unsent_data++;
 231                         }
 232                         if (unsent_data > 0) {
 233                                 break;
 234                         }
 235                 }
 236         }
 237         SCTP_TCB_SEND_UNLOCK(stcb);
 238         return (unsent_data);
 239 }
 240
 241 static int
 242 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb)
 243 {
 244         struct sctp_init *init;
 245         struct sctp_association *asoc;
 246         struct sctp_nets *lnet;
 247         unsigned int i;
 248
 249         init = &cp->init;
 250         asoc = &stcb->asoc;
 251         /* save off parameters */
 252         asoc->peer_vtag = ntohl(init->initiate_tag);
 253         asoc->peers_rwnd = ntohl(init->a_rwnd);
 254         /* init tsn's */
 255         asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
 256
 257         if (!TAILQ_EMPTY(&asoc->nets)) {
 258                 /* update any ssthresh's that may have a default */
 259                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
 260                         lnet->ssthresh = asoc->peers_rwnd;
 261                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
 262                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
 263                         }
 264                 }
 265         }
 266         SCTP_TCB_SEND_LOCK(stcb);
 267         if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
 268                 unsigned int newcnt;
 269                 struct sctp_stream_out *outs;
 270                 struct sctp_stream_queue_pending *sp, *nsp;
 271                 struct sctp_tmit_chunk *chk, *nchk;
 272
 273                 /* abandon the upper streams */
 274                 newcnt = ntohs(init->num_inbound_streams);
 275                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
 276                         if (chk->rec.data.sid >= newcnt) {
 277                                 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
 278                                 asoc->send_queue_cnt--;
 279                                 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) {
 280                                         asoc->strmout[chk->rec.data.sid].chunks_on_queues--;
 281 #ifdef INVARIANTS
 282                                 } else {
 283                                         panic("No chunks on the queues for sid %u.", chk->rec.data.sid);
 284 #endif
 285                                 }
 286                                 if (chk->data != NULL) {
 287                                         sctp_free_bufspace(stcb, asoc, chk, 1);
 288                                         sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb,
 289                                             0, chk, SCTP_SO_NOT_LOCKED);
 290                                         if (chk->data) {
 291                                                 sctp_m_freem(chk->data);
 292                                                 chk->data = NULL;
 293                                         }
 294                                 }
 295                                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 296                                 /* sa_ignore FREED_MEMORY */
 297                         }
 298                 }
 299                 if (asoc->strmout) {
 300                         for (i = newcnt; i < asoc->pre_open_streams; i++) {
 301                                 outs = &asoc->strmout[i];
 302                                 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
 303                                         atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 304                                         TAILQ_REMOVE(&outs->outqueue, sp, next);
 305                                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp);
 306                                         sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
 307                                             stcb, 0, sp, SCTP_SO_NOT_LOCKED);
 308                                         if (sp->data) {
 309                                                 sctp_m_freem(sp->data);
 310                                                 sp->data = NULL;
 311                                         }
 312                                         if (sp->net) {
 313                                                 sctp_free_remote_addr(sp->net);
 314                                                 sp->net = NULL;
 315                                         }
 316                                         /* Free the chunk */
 317                                         sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
 318                                         /* sa_ignore FREED_MEMORY */
 319                                 }
 320                                 outs->state = SCTP_STREAM_CLOSED;
 321                         }
 322                 }
 323                 /* cut back the count */
 324                 asoc->pre_open_streams = newcnt;
 325         }
 326         SCTP_TCB_SEND_UNLOCK(stcb);
 327         asoc->streamoutcnt = asoc->pre_open_streams;
 328         if (asoc->strmout) {
 329                 for (i = 0; i < asoc->streamoutcnt; i++) {
 330                         asoc->strmout[i].state = SCTP_STREAM_OPEN;
 331                 }
 332         }
 333         /* EY - nr_sack: initialize highest tsn in nr_mapping_array */
 334         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
 335         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
 336                 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 337         }
 338         /* This is the next one we expect */
 339         asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
 340
 341         asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
 342         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
 343
 344         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
 345         /* open the requested streams */
 346
 347         if (asoc->strmin != NULL) {
 348                 /* Free the old ones */
 349                 for (i = 0; i < asoc->streamincnt; i++) {
 350                         sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue);
 351                         sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue);
 352                 }
 353                 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
 354         }
 355         if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) {
 356                 asoc->streamincnt = ntohs(init->num_outbound_streams);
 357         } else {
 358                 asoc->streamincnt = asoc->max_inbound_streams;
 359         }
 360         SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
 361             sizeof(struct sctp_stream_in), SCTP_M_STRMI);
 362         if (asoc->strmin == NULL) {
 363                 /* we didn't get memory for the streams! */
 364                 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
 365                 return (-1);
 366         }
 367         for (i = 0; i < asoc->streamincnt; i++) {
 368                 asoc->strmin[i].sid = i;
 369                 asoc->strmin[i].last_mid_delivered = 0xffffffff;
 370                 TAILQ_INIT(&asoc->strmin[i].inqueue);
 371                 TAILQ_INIT(&asoc->strmin[i].uno_inqueue);
 372                 asoc->strmin[i].pd_api_started = 0;
 373                 asoc->strmin[i].delivery_started = 0;
 374         }
 375         /*
 376          * load_address_from_init will put the addresses into the
 377          * association when the COOKIE is processed or the INIT-ACK is
 378          * processed. Both types of COOKIE's existing and new call this
 379          * routine. It will remove addresses that are no longer in the
 380          * association (for the restarting case where addresses are
 381          * removed). Up front when the INIT arrives we will discard it if it
 382          * is a restart and new addresses have been added.
 383          */
 384         /* sa_ignore MEMLEAK */
 385         return (0);
 386 }
 387
 388 /*
 389  * INIT-ACK message processing/consumption returns value < 0 on error
 390  */
 391 static int
 392 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
 393     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
 394     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
 395     struct sctp_nets *net, int *abort_no_unlock,
 396     uint8_t mflowtype, uint32_t mflowid,
 397     uint32_t vrf_id)
 398 {
 399         struct sctp_association *asoc;
 400         struct mbuf *op_err;
 401         int retval, abort_flag, cookie_found;
 402         int initack_limit;
 403         int nat_friendly = 0;
 404
 405         /* First verify that we have no illegal param's */
 406         abort_flag = 0;
 407         cookie_found = 0;
 408
 409         op_err = sctp_arethere_unrecognized_parameters(m,
 410             (offset + sizeof(struct sctp_init_chunk)),
 411             &abort_flag, (struct sctp_chunkhdr *)cp,
 412             &nat_friendly, &cookie_found);
 413         if (abort_flag) {
 414                 /* Send an abort and notify peer */
 415                 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, false, SCTP_SO_NOT_LOCKED);
 416                 *abort_no_unlock = 1;
 417                 return (-1);
 418         }
 419         if (!cookie_found) {
 420                 uint16_t len;
 421
 422                 /* Only report the missing cookie parameter */
 423                 if (op_err != NULL) {
 424                         sctp_m_freem(op_err);
 425                 }
 426                 len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t));
 427                 /* We abort with an error of missing mandatory param */
 428                 op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA);
 429                 if (op_err != NULL) {
 430                         struct sctp_error_missing_param *cause;
 431
 432                         SCTP_BUF_LEN(op_err) = len;
 433                         cause = mtod(op_err, struct sctp_error_missing_param *);
 434                         /* Subtract the reserved param */
 435                         cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM);
 436                         cause->cause.length = htons(len);
 437                         cause->num_missing_params = htonl(1);
 438                         cause->type[0] = htons(SCTP_STATE_COOKIE);
 439                 }
 440                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 441                     src, dst, sh, op_err,
 442                     mflowtype, mflowid,
 443                     vrf_id, net->port);
 444                 *abort_no_unlock = 1;
 445                 return (-3);
 446         }
 447         asoc = &stcb->asoc;
 448         asoc->peer_supports_nat = (uint8_t)nat_friendly;
 449         /* process the peer's parameters in the INIT-ACK */
 450         if (sctp_process_init((struct sctp_init_chunk *)cp, stcb) < 0) {
 451                 if (op_err != NULL) {
 452                         sctp_m_freem(op_err);
 453                 }
 454                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
 455                 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n");
 456                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 457                     src, dst, sh, op_err,
 458                     mflowtype, mflowid,
 459                     vrf_id, net->port);
 460                 *abort_no_unlock = 1;
 461                 return (-1);
 462         }
 463         initack_limit = offset + ntohs(cp->ch.chunk_length);
 464         /* load all addresses */
 465         if ((retval = sctp_load_addresses_from_init(stcb, m,
 466             offset + sizeof(struct sctp_init_chunk),
 467             initack_limit, src, dst, NULL, stcb->asoc.port)) < 0) {
 468                 if (op_err != NULL) {
 469                         sctp_m_freem(op_err);
 470                 }
 471                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 472                     "Problem with address parameters");
 473                 SCTPDBG(SCTP_DEBUG_INPUT1,
 474                     "Load addresses from INIT causes an abort %d\n",
 475                     retval);
 476                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 477                     src, dst, sh, op_err,
 478                     mflowtype, mflowid,
 479                     vrf_id, net->port);
 480                 *abort_no_unlock = 1;
 481                 return (-1);
 482         }
 483         /* if the peer doesn't support asconf, flush the asconf queue */
 484         if (asoc->asconf_supported == 0) {
 485                 struct sctp_asconf_addr *param, *nparam;
 486
 487                 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
 488                         TAILQ_REMOVE(&asoc->asconf_queue, param, next);
 489                         SCTP_FREE(param, SCTP_M_ASC_ADDR);
 490                 }
 491         }
 492
 493         stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
 494             stcb->asoc.local_hmacs);
 495         if (op_err) {
 496                 sctp_queue_op_err(stcb, op_err);
 497                 /* queuing will steal away the mbuf chain to the out queue */
 498                 op_err = NULL;
 499         }
 500         /* extract the cookie and queue it to "echo" it back... */
 501         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 502                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 503                     stcb->asoc.overall_error_count,
 504                     0,
 505                     SCTP_FROM_SCTP_INPUT,
 506                     __LINE__);
 507         }
 508         stcb->asoc.overall_error_count = 0;
 509         net->error_count = 0;
 510
 511         /*
 512          * Cancel the INIT timer, We do this first before queueing the
 513          * cookie. We always cancel at the primary to assume that we are
 514          * canceling the timer started by the INIT which always goes to the
 515          * primary.
 516          */
 517         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
 518             asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 519
 520         /* calculate the RTO */
 521         sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered,
 522             SCTP_RTT_FROM_NON_DATA);
 523         retval = sctp_send_cookie_echo(m, offset, initack_limit, stcb, net);
 524         return (retval);
 525 }
 526
 527 static void
 528 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
 529     struct sctp_tcb *stcb, struct sctp_nets *net)
 530 {
 531         union sctp_sockstore store;
 532         struct sctp_nets *r_net, *f_net;
 533         struct timeval tv;
 534         int req_prim = 0;
 535         uint16_t old_error_counter;
 536
 537         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
 538                 /* Invalid length */
 539                 return;
 540         }
 541
 542         memset(&store, 0, sizeof(store));
 543         switch (cp->heartbeat.hb_info.addr_family) {
 544 #ifdef INET
 545         case AF_INET:
 546                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
 547                         store.sin.sin_family = cp->heartbeat.hb_info.addr_family;
 548                         store.sin.sin_len = cp->heartbeat.hb_info.addr_len;
 549                         store.sin.sin_port = stcb->rport;
 550                         memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address,
 551                             sizeof(store.sin.sin_addr));
 552                 } else {
 553                         return;
 554                 }
 555                 break;
 556 #endif
 557 #ifdef INET6
 558         case AF_INET6:
 559                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
 560                         store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family;
 561                         store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len;
 562                         store.sin6.sin6_port = stcb->rport;
 563                         memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr));
 564                 } else {
 565                         return;
 566                 }
 567                 break;
 568 #endif
 569         default:
 570                 return;
 571         }
 572         r_net = sctp_findnet(stcb, &store.sa);
 573         if (r_net == NULL) {
 574                 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
 575                 return;
 576         }
 577         if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 578             (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
 579             (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
 580                 /*
 581                  * If the its a HB and it's random value is correct when can
 582                  * confirm the destination.
 583                  */
 584                 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 585                 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
 586                         stcb->asoc.primary_destination = r_net;
 587                         r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
 588                         f_net = TAILQ_FIRST(&stcb->asoc.nets);
 589                         if (f_net != r_net) {
 590                                 /*
 591                                  * first one on the list is NOT the primary
 592                                  * sctp_cmpaddr() is much more efficient if
 593                                  * the primary is the first on the list,
 594                                  * make it so.
 595                                  */
 596                                 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
 597                                 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
 598                         }
 599                         req_prim = 1;
 600                 }
 601                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 602                     stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 603                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb,
 604                     r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
 605                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 606         }
 607         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 608                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 609                     stcb->asoc.overall_error_count,
 610                     0,
 611                     SCTP_FROM_SCTP_INPUT,
 612                     __LINE__);
 613         }
 614         stcb->asoc.overall_error_count = 0;
 615         old_error_counter = r_net->error_count;
 616         r_net->error_count = 0;
 617         r_net->hb_responded = 1;
 618         tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
 619         tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
 620         /* Now lets do a RTO with this */
 621         sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv,
 622             SCTP_RTT_FROM_NON_DATA);
 623         if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
 624                 r_net->dest_state |= SCTP_ADDR_REACHABLE;
 625                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
 626                     0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 627         }
 628         if (r_net->dest_state & SCTP_ADDR_PF) {
 629                 r_net->dest_state &= ~SCTP_ADDR_PF;
 630                 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
 631         }
 632         if (old_error_counter > 0) {
 633                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
 634                     stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5);
 635                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 636         }
 637         if (r_net == stcb->asoc.primary_destination) {
 638                 if (stcb->asoc.alternate) {
 639                         /* release the alternate, primary is good */
 640                         sctp_free_remote_addr(stcb->asoc.alternate);
 641                         stcb->asoc.alternate = NULL;
 642                 }
 643         }
 644         /* Mobility adaptation */
 645         if (req_prim) {
 646                 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
 647                     SCTP_MOBILITY_BASE) ||
 648                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 649                     SCTP_MOBILITY_FASTHANDOFF)) &&
 650                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 651                     SCTP_MOBILITY_PRIM_DELETED)) {
 652                         sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED,
 653                             stcb->sctp_ep, stcb, NULL,
 654                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 655                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 656                             SCTP_MOBILITY_FASTHANDOFF)) {
 657                                 sctp_assoc_immediate_retrans(stcb,
 658                                     stcb->asoc.primary_destination);
 659                         }
 660                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 661                             SCTP_MOBILITY_BASE)) {
 662                                 sctp_move_chunks_from_net(stcb,
 663                                     stcb->asoc.deleted_primary);
 664                         }
 665                         sctp_delete_prim_timer(stcb->sctp_ep, stcb);
 666                 }
 667         }
 668 }
 669
 670 static int
 671 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
 672 {
 673         /*
 674          * Return 0 means we want you to proceed with the abort non-zero
 675          * means no abort processing.
 676          */
 677         uint32_t new_vtag;
 678         struct sctpasochead *head;
 679
 680         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
 681             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
 682                 atomic_add_int(&stcb->asoc.refcnt, 1);
 683                 SCTP_TCB_UNLOCK(stcb);
 684                 SCTP_INP_INFO_WLOCK();
 685                 SCTP_TCB_LOCK(stcb);
 686                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 687         } else {
 688                 return (0);
 689         }
 690         new_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 691         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) {
 692                 /* generate a new vtag and send init */
 693                 LIST_REMOVE(stcb, sctp_asocs);
 694                 stcb->asoc.my_vtag = new_vtag;
 695                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 696                 /*
 697                  * put it in the bucket in the vtag hash of assoc's for the
 698                  * system
 699                  */
 700                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 701                 SCTP_INP_INFO_WUNLOCK();
 702                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 703                 return (1);
 704         } else {
 705                 /*
 706                  * treat like a case where the cookie expired i.e.: - dump
 707                  * current cookie. - generate a new vtag. - resend init.
 708                  */
 709                 /* generate a new vtag and send init */
 710                 LIST_REMOVE(stcb, sctp_asocs);
 711                 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
 712                 sctp_stop_all_cookie_timers(stcb);
 713                 sctp_toss_old_cookies(stcb, &stcb->asoc);
 714                 stcb->asoc.my_vtag = new_vtag;
 715                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 716                 /*
 717                  * put it in the bucket in the vtag hash of assoc's for the
 718                  * system
 719                  */
 720                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 721                 SCTP_INP_INFO_WUNLOCK();
 722                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 723                 return (1);
 724         }
 725         return (0);
 726 }
 727
 728 static int
 729 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
 730     struct sctp_nets *net)
 731 {
 732         /*
 733          * return 0 means we want you to proceed with the abort non-zero
 734          * means no abort processing
 735          */
 736         if (stcb->asoc.auth_supported == 0) {
 737                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
 738                 return (0);
 739         }
 740         sctp_asconf_send_nat_state_update(stcb, net);
 741         return (1);
 742 }
 743
 744 /* Returns 1 if the stcb was aborted, 0 otherwise */
 745 static int
 746 sctp_handle_abort(struct sctp_abort_chunk *abort,
 747     struct sctp_tcb *stcb, struct sctp_nets *net)
 748 {
 749         uint16_t len;
 750         uint16_t error;
 751
 752         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
 753         if (stcb == NULL)
 754                 return (0);
 755
 756         len = ntohs(abort->ch.chunk_length);
 757         if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) {
 758                 /*
 759                  * Need to check the cause codes for our two magic nat
 760                  * aborts which don't kill the assoc necessarily.
 761                  */
 762                 struct sctp_error_cause *cause;
 763
 764                 cause = (struct sctp_error_cause *)(abort + 1);
 765                 error = ntohs(cause->code);
 766                 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) {
 767                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ABORT flags:%x\n",
 768                             abort->ch.chunk_flags);
 769                         if (sctp_handle_nat_colliding_state(stcb)) {
 770                                 return (0);
 771                         }
 772                 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) {
 773                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ABORT flags:%x\n",
 774                             abort->ch.chunk_flags);
 775                         if (sctp_handle_nat_missing_state(stcb, net)) {
 776                                 return (0);
 777                         }
 778                 }
 779         } else {
 780                 error = 0;
 781         }
 782         /* stop any receive timers */
 783         sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL,
 784             SCTP_FROM_SCTP_INPUT + SCTP_LOC_7);
 785         /* notify user of the abort and clean up... */
 786         sctp_abort_notification(stcb, true, false, error, abort, SCTP_SO_NOT_LOCKED);
 787         /* free the tcb */
 788         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
 789         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
 790             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 791                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 792         }
 793 #ifdef SCTP_ASOCLOG_OF_TSNS
 794         sctp_print_out_track_log(stcb);
 795 #endif
 796         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 797             SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
 798         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
 799         return (1);
 800 }
 801
 802 static void
 803 sctp_start_net_timers(struct sctp_tcb *stcb)
 804 {
 805         uint32_t cnt_hb_sent;
 806         struct sctp_nets *net;
 807
 808         cnt_hb_sent = 0;
 809         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 810                 /*
 811                  * For each network start: 1) A pmtu timer. 2) A HB timer 3)
 812                  * If the dest in unconfirmed send a hb as well if under
 813                  * max_hb_burst have been sent.
 814                  */
 815                 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
 816                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
 817                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
 818                     (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
 819                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 820                         cnt_hb_sent++;
 821                 }
 822         }
 823         if (cnt_hb_sent) {
 824                 sctp_chunk_output(stcb->sctp_ep, stcb,
 825                     SCTP_OUTPUT_FROM_COOKIE_ACK,
 826                     SCTP_SO_NOT_LOCKED);
 827         }
 828 }
 829
 830 static void
 831 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
 832     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
 833 {
 834         struct sctp_association *asoc;
 835         int some_on_streamwheel;
 836         int old_state;
 837
 838         SCTPDBG(SCTP_DEBUG_INPUT2,
 839             "sctp_handle_shutdown: handling SHUTDOWN\n");
 840         if (stcb == NULL)
 841                 return;
 842         asoc = &stcb->asoc;
 843         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
 844             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
 845                 return;
 846         }
 847         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
 848                 /* Shutdown NOT the expected size */
 849                 return;
 850         }
 851         old_state = SCTP_GET_STATE(stcb);
 852         sctp_update_acked(stcb, cp, abort_flag);
 853         if (*abort_flag) {
 854                 return;
 855         }
 856         if (asoc->control_pdapi) {
 857                 /*
 858                  * With a normal shutdown we assume the end of last record.
 859                  */
 860                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 861                 if (asoc->control_pdapi->on_strm_q) {
 862                         struct sctp_stream_in *strm;
 863
 864                         strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream];
 865                         if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) {
 866                                 /* Unordered */
 867                                 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm);
 868                                 asoc->control_pdapi->on_strm_q = 0;
 869                         } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) {
 870                                 /* Ordered */
 871                                 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm);
 872                                 asoc->control_pdapi->on_strm_q = 0;
 873 #ifdef INVARIANTS
 874                         } else {
 875                                 panic("Unknown state on ctrl:%p on_strm_q:%d",
 876                                     asoc->control_pdapi,
 877                                     asoc->control_pdapi->on_strm_q);
 878 #endif
 879                         }
 880                 }
 881                 asoc->control_pdapi->end_added = 1;
 882                 asoc->control_pdapi->pdapi_aborted = 1;
 883                 asoc->control_pdapi = NULL;
 884                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 885                 if (stcb->sctp_socket) {
 886                         sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 887                 }
 888         }
 889         /* goto SHUTDOWN_RECEIVED state to block new requests */
 890         if (stcb->sctp_socket) {
 891                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 892                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
 893                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) {
 894                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_RECEIVED);
 895                         /*
 896                          * notify upper layer that peer has initiated a
 897                          * shutdown
 898                          */
 899                         sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 900
 901                         /* reset time */
 902                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
 903                 }
 904         }
 905         if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) {
 906                 /*
 907                  * stop the shutdown timer, since we WILL move to
 908                  * SHUTDOWN-ACK-SENT.
 909                  */
 910                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
 911                     net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
 912         }
 913         /* Now is there unsent data on a stream somewhere? */
 914         some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
 915
 916         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 917             !TAILQ_EMPTY(&asoc->sent_queue) ||
 918             some_on_streamwheel) {
 919                 /* By returning we will push more data out */
 920                 return;
 921         } else {
 922                 /* no outstanding data to send, so move on... */
 923                 /* send SHUTDOWN-ACK */
 924                 /* move to SHUTDOWN-ACK-SENT state */
 925                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
 926                     (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 927                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 928                 }
 929                 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
 930                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_ACK_SENT);
 931                         sctp_stop_timers_for_shutdown(stcb);
 932                         sctp_send_shutdown_ack(stcb, net);
 933                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
 934                             stcb->sctp_ep, stcb, net);
 935                 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) {
 936                         sctp_send_shutdown_ack(stcb, net);
 937                 }
 938         }
 939 }
 940
 941 static void
 942 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
 943     struct sctp_tcb *stcb,
 944     struct sctp_nets *net)
 945 {
 946         struct sctp_association *asoc;
 947
 948         SCTPDBG(SCTP_DEBUG_INPUT2,
 949             "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
 950         if (stcb == NULL)
 951                 return;
 952
 953         asoc = &stcb->asoc;
 954         /* process according to association state */
 955         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
 956             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
 957                 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
 958                 sctp_send_shutdown_complete(stcb, net, 1);
 959                 SCTP_TCB_UNLOCK(stcb);
 960                 return;
 961         }
 962         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
 963             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 964                 /* unexpected SHUTDOWN-ACK... so ignore... */
 965                 SCTP_TCB_UNLOCK(stcb);
 966                 return;
 967         }
 968         if (asoc->control_pdapi) {
 969                 /*
 970                  * With a normal shutdown we assume the end of last record.
 971                  */
 972                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 973                 asoc->control_pdapi->end_added = 1;
 974                 asoc->control_pdapi->pdapi_aborted = 1;
 975                 asoc->control_pdapi = NULL;
 976                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 977                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 978         }
 979 #ifdef INVARIANTS
 980         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 981             !TAILQ_EMPTY(&asoc->sent_queue) ||
 982             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
 983                 panic("Queues are not empty when handling SHUTDOWN-ACK");
 984         }
 985 #endif
 986         /* stop the timer */
 987         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net,
 988             SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
 989         /* send SHUTDOWN-COMPLETE */
 990         sctp_send_shutdown_complete(stcb, net, 0);
 991         /* notify upper layer protocol */
 992         if (stcb->sctp_socket) {
 993                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
 994                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
 995                         stcb->sctp_socket->so_snd.sb_cc = 0;
 996                 }
 997                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 998         }
 999         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1000         /* free the TCB but first save off the ep */
1001         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1002             SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1003 }
1004
1005 static void
1006 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type)
1007 {
1008         switch (chunk_type) {
1009         case SCTP_ASCONF_ACK:
1010         case SCTP_ASCONF:
1011                 sctp_asconf_cleanup(stcb);
1012                 break;
1013         case SCTP_IFORWARD_CUM_TSN:
1014         case SCTP_FORWARD_CUM_TSN:
1015                 stcb->asoc.prsctp_supported = 0;
1016                 break;
1017         default:
1018                 SCTPDBG(SCTP_DEBUG_INPUT2,
1019                     "Peer does not support chunk type %d (0x%x).\n",
1020                     chunk_type, chunk_type);
1021                 break;
1022         }
1023 }
1024
1025 /*
1026  * Skip past the param header and then we will find the param that caused the
1027  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1028  * these will turn of specific features.
1029  * XXX: Is this the right thing to do?
1030  */
1031 static void
1032 sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type)
1033 {
1034         switch (parameter_type) {
1035                 /* pr-sctp draft */
1036         case SCTP_PRSCTP_SUPPORTED:
1037                 stcb->asoc.prsctp_supported = 0;
1038                 break;
1039         case SCTP_SUPPORTED_CHUNK_EXT:
1040                 break;
1041                 /* draft-ietf-tsvwg-addip-sctp */
1042         case SCTP_HAS_NAT_SUPPORT:
1043                 stcb->asoc.peer_supports_nat = 0;
1044                 break;
1045         case SCTP_ADD_IP_ADDRESS:
1046         case SCTP_DEL_IP_ADDRESS:
1047         case SCTP_SET_PRIM_ADDR:
1048                 stcb->asoc.asconf_supported = 0;
1049                 break;
1050         case SCTP_SUCCESS_REPORT:
1051         case SCTP_ERROR_CAUSE_IND:
1052                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1053                 SCTPDBG(SCTP_DEBUG_INPUT2,
1054                     "Turning off ASCONF to this strange peer\n");
1055                 stcb->asoc.asconf_supported = 0;
1056                 break;
1057         default:
1058                 SCTPDBG(SCTP_DEBUG_INPUT2,
1059                     "Peer does not support param type %d (0x%x)??\n",
1060                     parameter_type, parameter_type);
1061                 break;
1062         }
1063 }
1064
1065 static int
1066 sctp_handle_error(struct sctp_chunkhdr *ch,
1067     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
1068 {
1069         struct sctp_error_cause *cause;
1070         struct sctp_association *asoc;
1071         uint32_t remaining_length, adjust;
1072         uint16_t code, cause_code, cause_length;
1073
1074         /* parse through all of the errors and process */
1075         asoc = &stcb->asoc;
1076         cause = (struct sctp_error_cause *)((caddr_t)ch +
1077             sizeof(struct sctp_chunkhdr));
1078         remaining_length = ntohs(ch->chunk_length);
1079         if (remaining_length > limit) {
1080                 remaining_length = limit;
1081         }
1082         if (remaining_length >= sizeof(struct sctp_chunkhdr)) {
1083                 remaining_length -= sizeof(struct sctp_chunkhdr);
1084         } else {
1085                 remaining_length = 0;
1086         }
1087         code = 0;
1088         while (remaining_length >= sizeof(struct sctp_error_cause)) {
1089                 /* Process an Error Cause */
1090                 cause_code = ntohs(cause->code);
1091                 cause_length = ntohs(cause->length);
1092                 if ((cause_length > remaining_length) || (cause_length == 0)) {
1093                         /* Invalid cause length, possibly due to truncation. */
1094                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n",
1095                             remaining_length, cause_length);
1096                         return (0);
1097                 }
1098                 if (code == 0) {
1099                         /* report the first error cause */
1100                         code = cause_code;
1101                 }
1102                 switch (cause_code) {
1103                 case SCTP_CAUSE_INVALID_STREAM:
1104                 case SCTP_CAUSE_MISSING_PARAM:
1105                 case SCTP_CAUSE_INVALID_PARAM:
1106                 case SCTP_CAUSE_NO_USER_DATA:
1107                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n",
1108                             cause_code);
1109                         break;
1110                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1111                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ERROR flags: %x\n",
1112                             ch->chunk_flags);
1113                         if (sctp_handle_nat_colliding_state(stcb)) {
1114                                 return (0);
1115                         }
1116                         break;
1117                 case SCTP_CAUSE_NAT_MISSING_STATE:
1118                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ERROR flags: %x\n",
1119                             ch->chunk_flags);
1120                         if (sctp_handle_nat_missing_state(stcb, net)) {
1121                                 return (0);
1122                         }
1123                         break;
1124                 case SCTP_CAUSE_STALE_COOKIE:
1125                         /*
1126                          * We only act if we have echoed a cookie and are
1127                          * waiting.
1128                          */
1129                         if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) &&
1130                             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
1131                                 struct sctp_error_stale_cookie *stale_cookie;
1132
1133                                 stale_cookie = (struct sctp_error_stale_cookie *)cause;
1134                                 /* stable_time is in usec, convert to msec. */
1135                                 asoc->cookie_preserve_req = ntohl(stale_cookie->stale_time) / 1000;
1136                                 /* Double it to be more robust on RTX. */
1137                                 asoc->cookie_preserve_req *= 2;
1138                                 asoc->stale_cookie_count++;
1139                                 if (asoc->stale_cookie_count >
1140                                     asoc->max_init_times) {
1141                                         sctp_abort_notification(stcb, false, true, 0, NULL, SCTP_SO_NOT_LOCKED);
1142                                         /* now free the asoc */
1143                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1144                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1145                                         return (-1);
1146                                 }
1147                                 /* blast back to INIT state */
1148                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
1149                                 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
1150                                 sctp_stop_all_cookie_timers(stcb);
1151                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1152                         }
1153                         break;
1154                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1155                         /*
1156                          * Nothing we can do here, we don't do hostname
1157                          * addresses so if the peer does not like my IPv6
1158                          * (or IPv4 for that matter) it does not matter. If
1159                          * they don't support that type of address, they can
1160                          * NOT possibly get that packet type... i.e. with no
1161                          * IPv6 you can't receive a IPv6 packet. so we can
1162                          * safely ignore this one. If we ever added support
1163                          * for HOSTNAME Addresses, then we would need to do
1164                          * something here.
1165                          */
1166                         break;
1167                 case SCTP_CAUSE_UNRECOG_CHUNK:
1168                         if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) {
1169                                 struct sctp_error_unrecognized_chunk *unrec_chunk;
1170
1171                                 unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause;
1172                                 sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type);
1173                         }
1174                         break;
1175                 case SCTP_CAUSE_UNRECOG_PARAM:
1176                         /* XXX: We only consider the first parameter */
1177                         if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) {
1178                                 struct sctp_paramhdr *unrec_parameter;
1179
1180                                 unrec_parameter = (struct sctp_paramhdr *)(cause + 1);
1181                                 sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type));
1182                         }
1183                         break;
1184                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1185                         /*
1186                          * We ignore this since the timer will drive out a
1187                          * new cookie anyway and there timer will drive us
1188                          * to send a SHUTDOWN_COMPLETE. We can't send one
1189                          * here since we don't have their tag.
1190                          */
1191                         break;
1192                 case SCTP_CAUSE_DELETING_LAST_ADDR:
1193                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1194                 case SCTP_CAUSE_DELETING_SRC_ADDR:
1195                         /*
1196                          * We should NOT get these here, but in a
1197                          * ASCONF-ACK.
1198                          */
1199                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n",
1200                             cause_code);
1201                         break;
1202                 case SCTP_CAUSE_OUT_OF_RESC:
1203                         /*
1204                          * And what, pray tell do we do with the fact that
1205                          * the peer is out of resources? Not really sure we
1206                          * could do anything but abort. I suspect this
1207                          * should have came WITH an abort instead of in a
1208                          * OP-ERROR.
1209                          */
1210                         break;
1211                 default:
1212                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n",
1213                             cause_code);
1214                         break;
1215                 }
1216                 adjust = SCTP_SIZE32(cause_length);
1217                 if (remaining_length >= adjust) {
1218                         remaining_length -= adjust;
1219                 } else {
1220                         remaining_length = 0;
1221                 }
1222                 cause = (struct sctp_error_cause *)((caddr_t)cause + adjust);
1223         }
1224         sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED);
1225         return (0);
1226 }
1227
1228 static int
1229 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1230     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
1231     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1232     struct sctp_nets *net, int *abort_no_unlock,
1233     uint8_t mflowtype, uint32_t mflowid,
1234     uint32_t vrf_id)
1235 {
1236         struct sctp_init_ack *init_ack;
1237         struct mbuf *op_err;
1238
1239         SCTPDBG(SCTP_DEBUG_INPUT2,
1240             "sctp_handle_init_ack: handling INIT-ACK\n");
1241
1242         if (stcb == NULL) {
1243                 SCTPDBG(SCTP_DEBUG_INPUT2,
1244                     "sctp_handle_init_ack: TCB is null\n");
1245                 return (-1);
1246         }
1247         /* Only process the INIT-ACK chunk in COOKIE WAIT state. */
1248         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) {
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                         /* One of the mandatory parameters is illegal. */
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                 if (stcb->asoc.primary_destination->dest_state &
1265                     SCTP_ADDR_UNCONFIRMED) {
1266                         /*
1267                          * The primary is where we sent the INIT, we can
1268                          * always consider it confirmed when the INIT-ACK is
1269                          * returned. Do this before we load addresses
1270                          * though.
1271                          */
1272                         stcb->asoc.primary_destination->dest_state &=
1273                             ~SCTP_ADDR_UNCONFIRMED;
1274                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1275                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1276                 }
1277                 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
1278                     net, abort_no_unlock,
1279                     mflowtype, mflowid,
1280                     vrf_id) < 0) {
1281                         /* error in parsing parameters */
1282                         return (-1);
1283                 }
1284                 /* Update our state. */
1285                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1286                 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_ECHOED);
1287
1288                 /* Reset the RTO calculation. */
1289                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1290                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1291                             stcb->asoc.overall_error_count,
1292                             0,
1293                             SCTP_FROM_SCTP_INPUT,
1294                             __LINE__);
1295                 }
1296                 stcb->asoc.overall_error_count = 0;
1297                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1298                 /*
1299                  * Collapse the init timer back in case of a exponential
1300                  * backoff.
1301                  */
1302                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1303                     stcb, net);
1304                 /*
1305                  * The output routine at the end of the inbound data
1306                  * processing will cause the cookie to be sent.
1307                  */
1308                 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1309                 return (0);
1310         } else {
1311                 return (-1);
1312         }
1313 }
1314
1315 static struct sctp_tcb *
1316 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1317     struct sockaddr *src, struct sockaddr *dst,
1318     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1319     struct sctp_inpcb *inp, struct sctp_nets **netp,
1320     struct sockaddr *init_src, int *notification,
1321     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1322     uint8_t mflowtype, uint32_t mflowid,
1323     uint32_t vrf_id, uint16_t port);
1324
1325 /*
1326  * handle a state cookie for an existing association m: input packet mbuf
1327  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1328  * "split" mbuf and the cookie signature does not exist offset: offset into
1329  * mbuf to the cookie-echo chunk
1330  */
1331 static struct sctp_tcb *
1332 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1333     struct sockaddr *src, struct sockaddr *dst,
1334     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1335     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1336     struct sockaddr *init_src, int *notification,
1337     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1338     uint8_t mflowtype, uint32_t mflowid,
1339     uint32_t vrf_id, uint16_t port)
1340 {
1341         struct sctp_association *asoc;
1342         struct sctp_init_chunk *init_cp, init_buf;
1343         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1344         struct sctp_asconf_addr *aparam, *naparam;
1345         struct sctp_asconf_ack *aack, *naack;
1346         struct sctp_tmit_chunk *chk, *nchk;
1347         struct sctp_stream_reset_list *strrst, *nstrrst;
1348         struct sctp_queued_to_read *sq, *nsq;
1349         struct sctp_nets *net;
1350         struct mbuf *op_err;
1351         struct timeval old;
1352         int init_offset, initack_offset, i;
1353         int retval;
1354         int spec_flag = 0;
1355         uint32_t how_indx;
1356 #if defined(SCTP_DETAILED_STR_STATS)
1357         int j;
1358 #endif
1359
1360         net = *netp;
1361         /* I know that the TCB is non-NULL from the caller */
1362         asoc = &stcb->asoc;
1363         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1364                 if (asoc->cookie_how[how_indx] == 0)
1365                         break;
1366         }
1367         if (how_indx < sizeof(asoc->cookie_how)) {
1368                 asoc->cookie_how[how_indx] = 1;
1369         }
1370         if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1371                 /* SHUTDOWN came in after sending INIT-ACK */
1372                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1373                 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, "");
1374                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
1375                     mflowtype, mflowid, inp->fibnum,
1376                     vrf_id, net->port);
1377                 if (how_indx < sizeof(asoc->cookie_how))
1378                         asoc->cookie_how[how_indx] = 2;
1379                 SCTP_TCB_UNLOCK(stcb);
1380                 return (NULL);
1381         }
1382         /*
1383          * find and validate the INIT chunk in the cookie (peer's info) the
1384          * INIT should start after the cookie-echo header struct (chunk
1385          * header, state cookie header struct)
1386          */
1387         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1388
1389         init_cp = (struct sctp_init_chunk *)
1390             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1391             (uint8_t *)&init_buf);
1392         if (init_cp == NULL) {
1393                 /* could not pull a INIT chunk in cookie */
1394                 SCTP_TCB_UNLOCK(stcb);
1395                 return (NULL);
1396         }
1397         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1398                 SCTP_TCB_UNLOCK(stcb);
1399                 return (NULL);
1400         }
1401         /*
1402          * find and validate the INIT-ACK chunk in the cookie (my info) the
1403          * INIT-ACK follows the INIT chunk
1404          */
1405         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1406         initack_cp = (struct sctp_init_ack_chunk *)
1407             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1408             (uint8_t *)&initack_buf);
1409         if (initack_cp == NULL) {
1410                 /* could not pull INIT-ACK chunk in cookie */
1411                 SCTP_TCB_UNLOCK(stcb);
1412                 return (NULL);
1413         }
1414         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1415                 SCTP_TCB_UNLOCK(stcb);
1416                 return (NULL);
1417         }
1418         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1419             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1420                 /*
1421                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
1422                  * to get into the OPEN state
1423                  */
1424                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1425                         /*-
1426                          * Opps, this means that we somehow generated two vtag's
1427                          * the same. I.e. we did:
1428                          *  Us               Peer
1429                          *   <---INIT(tag=a)------
1430                          *   ----INIT-ACK(tag=t)-->
1431                          *   ----INIT(tag=t)------> *1
1432                          *   <---INIT-ACK(tag=a)---
1433                          *   <----CE(tag=t)------------- *2
1434                          *
1435                          * At point *1 we should be generating a different
1436                          * tag t'. Which means we would throw away the CE and send
1437                          * ours instead. Basically this is case C (throw away side).
1438                          */
1439                         if (how_indx < sizeof(asoc->cookie_how))
1440                                 asoc->cookie_how[how_indx] = 17;
1441                         SCTP_TCB_UNLOCK(stcb);
1442                         return (NULL);
1443                 }
1444                 switch (SCTP_GET_STATE(stcb)) {
1445                 case SCTP_STATE_COOKIE_WAIT:
1446                 case SCTP_STATE_COOKIE_ECHOED:
1447                         /*
1448                          * INIT was sent but got a COOKIE_ECHO with the
1449                          * correct tags... just accept it...but we must
1450                          * process the init so that we can make sure we have
1451                          * the right seq no's.
1452                          */
1453                         /* First we must process the INIT !! */
1454                         if (sctp_process_init(init_cp, stcb) < 0) {
1455                                 if (how_indx < sizeof(asoc->cookie_how))
1456                                         asoc->cookie_how[how_indx] = 3;
1457                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
1458                                 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n");
1459                                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1460                                     src, dst, sh, op_err,
1461                                     mflowtype, mflowid,
1462                                     vrf_id, net->port);
1463                                 return (NULL);
1464                         }
1465                         /* we have already processed the INIT so no problem */
1466                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp,
1467                             stcb, net,
1468                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1469                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp,
1470                             stcb, net,
1471                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1472                         /* update current state */
1473                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)
1474                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1475                         else
1476                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1477
1478                         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1479                         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1480                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1481                                     stcb->sctp_ep, stcb, NULL);
1482                         }
1483                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1484                         sctp_stop_all_cookie_timers(stcb);
1485                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1486                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1487                             (!SCTP_IS_LISTENING(inp))) {
1488                                 /*
1489                                  * Here is where collision would go if we
1490                                  * did a connect() and instead got a
1491                                  * init/init-ack/cookie done before the
1492                                  * init-ack came back..
1493                                  */
1494                                 stcb->sctp_ep->sctp_flags |=
1495                                     SCTP_PCB_FLAGS_CONNECTED;
1496                                 soisconnected(stcb->sctp_socket);
1497                         }
1498                         /* notify upper layer */
1499                         *notification = SCTP_NOTIFY_ASSOC_UP;
1500                         /*
1501                          * since we did not send a HB make sure we don't
1502                          * double things
1503                          */
1504                         old.tv_sec = cookie->time_entered.tv_sec;
1505                         old.tv_usec = cookie->time_entered.tv_usec;
1506                         net->hb_responded = 1;
1507                         sctp_calculate_rto(stcb, asoc, net, &old,
1508                             SCTP_RTT_FROM_NON_DATA);
1509
1510                         if (stcb->asoc.sctp_autoclose_ticks &&
1511                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1512                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1513                                     inp, stcb, NULL);
1514                         }
1515                         break;
1516                 default:
1517                         /*
1518                          * we're in the OPEN state (or beyond), so peer must
1519                          * have simply lost the COOKIE-ACK
1520                          */
1521                         break;
1522                 }               /* end switch */
1523                 sctp_stop_all_cookie_timers(stcb);
1524                 if ((retval = sctp_load_addresses_from_init(stcb, m,
1525                     init_offset + sizeof(struct sctp_init_chunk),
1526                     initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) {
1527                         if (how_indx < sizeof(asoc->cookie_how))
1528                                 asoc->cookie_how[how_indx] = 4;
1529                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
1530                             "Problem with address parameters");
1531                         SCTPDBG(SCTP_DEBUG_INPUT1,
1532                             "Load addresses from INIT causes an abort %d\n",
1533                             retval);
1534                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1535                             src, dst, sh, op_err,
1536                             mflowtype, mflowid,
1537                             vrf_id, net->port);
1538                         return (NULL);
1539                 }
1540                 /* respond with a COOKIE-ACK */
1541                 sctp_toss_old_cookies(stcb, asoc);
1542                 sctp_send_cookie_ack(stcb);
1543                 if (how_indx < sizeof(asoc->cookie_how))
1544                         asoc->cookie_how[how_indx] = 5;
1545                 return (stcb);
1546         }
1547
1548         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1549             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1550             cookie->tie_tag_my_vtag == 0 &&
1551             cookie->tie_tag_peer_vtag == 0) {
1552                 /*
1553                  * case C in Section 5.2.4 Table 2: XMOO silently discard
1554                  */
1555                 if (how_indx < sizeof(asoc->cookie_how))
1556                         asoc->cookie_how[how_indx] = 6;
1557                 SCTP_TCB_UNLOCK(stcb);
1558                 return (NULL);
1559         }
1560         /*
1561          * If nat support, and the below and stcb is established, send back
1562          * a ABORT(colliding state) if we are established.
1563          */
1564         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) &&
1565             (asoc->peer_supports_nat) &&
1566             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1567             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1568             (asoc->peer_vtag == 0)))) {
1569                 /*
1570                  * Special case - Peer's support nat. We may have two init's
1571                  * that we gave out the same tag on since one was not
1572                  * established.. i.e. we get INIT from host-1 behind the nat
1573                  * and we respond tag-a, we get a INIT from host-2 behind
1574                  * the nat and we get tag-a again. Then we bring up host-1
1575                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1576                  * Now we have colliding state. We must send an abort here
1577                  * with colliding state indication.
1578                  */
1579                 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, "");
1580                 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
1581                     mflowtype, mflowid, inp->fibnum,
1582                     vrf_id, port);
1583                 SCTP_TCB_UNLOCK(stcb);
1584                 return (NULL);
1585         }
1586         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1587             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1588             (asoc->peer_vtag == 0))) {
1589                 /*
1590                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1591                  * should be ok, re-accept peer info
1592                  */
1593                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1594                         /*
1595                          * Extension of case C. If we hit this, then the
1596                          * random number generator returned the same vtag
1597                          * when we first sent our INIT-ACK and when we later
1598                          * sent our INIT. The side with the seq numbers that
1599                          * are different will be the one that normnally
1600                          * would have hit case C. This in effect "extends"
1601                          * our vtags in this collision case to be 64 bits.
1602                          * The same collision could occur aka you get both
1603                          * vtag and seq number the same twice in a row.. but
1604                          * is much less likely. If it did happen then we
1605                          * would proceed through and bring up the assoc.. we
1606                          * may end up with the wrong stream setup however..
1607                          * which would be bad.. but there is no way to
1608                          * tell.. until we send on a stream that does not
1609                          * exist :-)
1610                          */
1611                         if (how_indx < sizeof(asoc->cookie_how))
1612                                 asoc->cookie_how[how_indx] = 7;
1613
1614                         SCTP_TCB_UNLOCK(stcb);
1615                         return (NULL);
1616                 }
1617                 if (how_indx < sizeof(asoc->cookie_how))
1618                         asoc->cookie_how[how_indx] = 8;
1619                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1620                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1621                 sctp_stop_all_cookie_timers(stcb);
1622                 /*
1623                  * since we did not send a HB make sure we don't double
1624                  * things
1625                  */
1626                 net->hb_responded = 1;
1627                 if (stcb->asoc.sctp_autoclose_ticks &&
1628                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1629                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1630                             NULL);
1631                 }
1632                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1633                 if (asoc->pre_open_streams < asoc->streamoutcnt) {
1634                         asoc->pre_open_streams = asoc->streamoutcnt;
1635                 }
1636
1637                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1638                         /*
1639                          * Ok the peer probably discarded our data (if we
1640                          * echoed a cookie+data). So anything on the
1641                          * sent_queue should be marked for retransmit, we
1642                          * may not get something to kick us so it COULD
1643                          * still take a timeout to move these.. but it can't
1644                          * hurt to mark them.
1645                          */
1646
1647                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1648                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1649                                         chk->sent = SCTP_DATAGRAM_RESEND;
1650                                         sctp_flight_size_decrease(chk);
1651                                         sctp_total_flight_decrease(stcb, chk);
1652                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1653                                         spec_flag++;
1654                                 }
1655                         }
1656                 }
1657                 /* process the INIT info (peer's info) */
1658                 if (sctp_process_init(init_cp, stcb) < 0) {
1659                         if (how_indx < sizeof(asoc->cookie_how))
1660                                 asoc->cookie_how[how_indx] = 9;
1661                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
1662                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n");
1663                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1664                             src, dst, sh, op_err,
1665                             mflowtype, mflowid,
1666                             vrf_id, net->port);
1667                         return (NULL);
1668                 }
1669                 if ((retval = sctp_load_addresses_from_init(stcb, m,
1670                     init_offset + sizeof(struct sctp_init_chunk),
1671                     initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) {
1672                         if (how_indx < sizeof(asoc->cookie_how))
1673                                 asoc->cookie_how[how_indx] = 10;
1674                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
1675                             "Problem with address parameters");
1676                         SCTPDBG(SCTP_DEBUG_INPUT1,
1677                             "Load addresses from INIT causes an abort %d\n",
1678                             retval);
1679                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1680                             src, dst, sh, op_err,
1681                             mflowtype, mflowid,
1682                             vrf_id, net->port);
1683                         return (NULL);
1684                 }
1685                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
1686                     (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
1687                         *notification = SCTP_NOTIFY_ASSOC_UP;
1688
1689                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1690                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1691                             (!SCTP_IS_LISTENING(inp))) {
1692                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
1693                                 soisconnected(stcb->sctp_socket);
1694                         }
1695                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)
1696                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1697                         else
1698                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1699                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1700                 } else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
1701                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1702                 } else {
1703                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1704                 }
1705                 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1706                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1707                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1708                             stcb->sctp_ep, stcb, NULL);
1709                 }
1710                 sctp_stop_all_cookie_timers(stcb);
1711                 sctp_toss_old_cookies(stcb, asoc);
1712                 sctp_send_cookie_ack(stcb);
1713                 if (spec_flag) {
1714                         /*
1715                          * only if we have retrans set do we do this. What
1716                          * this call does is get only the COOKIE-ACK out and
1717                          * then when we return the normal call to
1718                          * sctp_chunk_output will get the retrans out behind
1719                          * this.
1720                          */
1721                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1722                 }
1723                 if (how_indx < sizeof(asoc->cookie_how))
1724                         asoc->cookie_how[how_indx] = 11;
1725
1726                 return (stcb);
1727         }
1728         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1729             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1730             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1731             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1732             cookie->tie_tag_peer_vtag != 0) {
1733                 struct sctpasochead *head;
1734
1735                 if (asoc->peer_supports_nat) {
1736                         struct sctp_tcb *local_stcb;
1737
1738                         /*
1739                          * This is a gross gross hack. Just call the
1740                          * cookie_new code since we are allowing a duplicate
1741                          * association. I hope this works...
1742                          */
1743                         local_stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst,
1744                             sh, cookie, cookie_len,
1745                             inp, netp, init_src, notification,
1746                             auth_skipped, auth_offset, auth_len,
1747                             mflowtype, mflowid,
1748                             vrf_id, port);
1749                         if (local_stcb == NULL) {
1750                                 SCTP_TCB_UNLOCK(stcb);
1751                         }
1752                         return (local_stcb);
1753                 }
1754                 /*
1755                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1756                  */
1757                 /* temp code */
1758                 if (how_indx < sizeof(asoc->cookie_how))
1759                         asoc->cookie_how[how_indx] = 12;
1760                 sctp_stop_association_timers(stcb, false);
1761                 /* notify upper layer */
1762                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1763                 atomic_add_int(&stcb->asoc.refcnt, 1);
1764                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) &&
1765                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1766                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) {
1767                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1768                 }
1769                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
1770                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1771                 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
1772                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1773                 }
1774                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1775                         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1776                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1777                             stcb->sctp_ep, stcb, NULL);
1778
1779                 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
1780                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1781                         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1782                 }
1783                 if (asoc->pre_open_streams < asoc->streamoutcnt) {
1784                         asoc->pre_open_streams = asoc->streamoutcnt;
1785                 }
1786                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1787                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1788                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1789                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1790                 asoc->str_reset_seq_in = asoc->init_seq_number;
1791                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1792                 asoc->send_sack = 1;
1793                 asoc->data_pkts_seen = 0;
1794                 asoc->last_data_chunk_from = NULL;
1795                 asoc->last_control_chunk_from = NULL;
1796                 asoc->last_net_cmt_send_started = NULL;
1797                 if (asoc->mapping_array) {
1798                         memset(asoc->mapping_array, 0,
1799                             asoc->mapping_array_size);
1800                 }
1801                 if (asoc->nr_mapping_array) {
1802                         memset(asoc->nr_mapping_array, 0,
1803                             asoc->mapping_array_size);
1804                 }
1805                 SCTP_TCB_UNLOCK(stcb);
1806                 SCTP_INP_INFO_WLOCK();
1807                 SCTP_INP_WLOCK(stcb->sctp_ep);
1808                 SCTP_TCB_LOCK(stcb);
1809                 atomic_add_int(&stcb->asoc.refcnt, -1);
1810                 /* send up all the data */
1811                 SCTP_TCB_SEND_LOCK(stcb);
1812
1813                 sctp_report_all_outbound(stcb, 0, SCTP_SO_LOCKED);
1814                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1815                         stcb->asoc.strmout[i].chunks_on_queues = 0;
1816 #if defined(SCTP_DETAILED_STR_STATS)
1817                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
1818                                 asoc->strmout[i].abandoned_sent[j] = 0;
1819                                 asoc->strmout[i].abandoned_unsent[j] = 0;
1820                         }
1821 #else
1822                         asoc->strmout[i].abandoned_sent[0] = 0;
1823                         asoc->strmout[i].abandoned_unsent[0] = 0;
1824 #endif
1825                         stcb->asoc.strmout[i].next_mid_ordered = 0;
1826                         stcb->asoc.strmout[i].next_mid_unordered = 0;
1827                         stcb->asoc.strmout[i].sid = i;
1828                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
1829                 }
1830                 TAILQ_FOREACH_SAFE(strrst, &asoc->resetHead, next_resp, nstrrst) {
1831                         TAILQ_REMOVE(&asoc->resetHead, strrst, next_resp);
1832                         SCTP_FREE(strrst, SCTP_M_STRESET);
1833                 }
1834                 TAILQ_FOREACH_SAFE(sq, &asoc->pending_reply_queue, next, nsq) {
1835                         TAILQ_REMOVE(&asoc->pending_reply_queue, sq, next);
1836                         if (sq->data) {
1837                                 sctp_m_freem(sq->data);
1838                                 sq->data = NULL;
1839                         }
1840                         sctp_free_remote_addr(sq->whoFrom);
1841                         sq->whoFrom = NULL;
1842                         sq->stcb = NULL;
1843                         sctp_free_a_readq(stcb, sq);
1844                 }
1845                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
1846                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
1847                         if (chk->data) {
1848                                 sctp_m_freem(chk->data);
1849                                 chk->data = NULL;
1850                         }
1851                         if (chk->holds_key_ref)
1852                                 sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED);
1853                         sctp_free_remote_addr(chk->whoTo);
1854                         SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk);
1855                         SCTP_DECR_CHK_COUNT();
1856                 }
1857                 asoc->ctrl_queue_cnt = 0;
1858                 asoc->str_reset = NULL;
1859                 asoc->stream_reset_outstanding = 0;
1860                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
1861                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
1862                         if (chk->data) {
1863                                 sctp_m_freem(chk->data);
1864                                 chk->data = NULL;
1865                         }
1866                         if (chk->holds_key_ref)
1867                                 sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED);
1868                         sctp_free_remote_addr(chk->whoTo);
1869                         SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk);
1870                         SCTP_DECR_CHK_COUNT();
1871                 }
1872                 TAILQ_FOREACH_SAFE(aparam, &asoc->asconf_queue, next, naparam) {
1873                         TAILQ_REMOVE(&asoc->asconf_queue, aparam, next);
1874                         SCTP_FREE(aparam, SCTP_M_ASC_ADDR);
1875                 }
1876                 TAILQ_FOREACH_SAFE(aack, &asoc->asconf_ack_sent, next, naack) {
1877                         TAILQ_REMOVE(&asoc->asconf_ack_sent, aack, next);
1878                         if (aack->data != NULL) {
1879                                 sctp_m_freem(aack->data);
1880                         }
1881                         SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_asconf_ack), aack);
1882                 }
1883
1884                 /* process the INIT-ACK info (my info) */
1885                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1886                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1887
1888                 /* pull from vtag hash */
1889                 LIST_REMOVE(stcb, sctp_asocs);
1890                 /* re-insert to new vtag position */
1891                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1892                     SCTP_BASE_INFO(hashasocmark))];
1893                 /*
1894                  * put it in the bucket in the vtag hash of assoc's for the
1895                  * system
1896                  */
1897                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
1898
1899                 SCTP_TCB_SEND_UNLOCK(stcb);
1900                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
1901                 SCTP_INP_INFO_WUNLOCK();
1902                 asoc->total_flight = 0;
1903                 asoc->total_flight_count = 0;
1904                 /* process the INIT info (peer's info) */
1905                 if (sctp_process_init(init_cp, stcb) < 0) {
1906                         if (how_indx < sizeof(asoc->cookie_how))
1907                                 asoc->cookie_how[how_indx] = 13;
1908                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
1909                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n");
1910                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1911                             src, dst, sh, op_err,
1912                             mflowtype, mflowid,
1913                             vrf_id, net->port);
1914                         return (NULL);
1915                 }
1916                 /*
1917                  * since we did not send a HB make sure we don't double
1918                  * things
1919                  */
1920                 net->hb_responded = 1;
1921
1922                 if ((retval = sctp_load_addresses_from_init(stcb, m,
1923                     init_offset + sizeof(struct sctp_init_chunk),
1924                     initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) {
1925                         if (how_indx < sizeof(asoc->cookie_how))
1926                                 asoc->cookie_how[how_indx] = 14;
1927                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
1928                             "Problem with address parameters");
1929                         SCTPDBG(SCTP_DEBUG_INPUT1,
1930                             "Load addresses from INIT causes an abort %d\n",
1931                             retval);
1932                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1933                             src, dst, sh, op_err,
1934                             mflowtype, mflowid,
1935                             vrf_id, net->port);
1936                         return (NULL);
1937                 }
1938                 /* respond with a COOKIE-ACK */
1939                 sctp_send_cookie_ack(stcb);
1940                 if (how_indx < sizeof(asoc->cookie_how))
1941                         asoc->cookie_how[how_indx] = 15;
1942                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE) &&
1943                     (asoc->sctp_autoclose_ticks > 0)) {
1944                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
1945                 }
1946                 return (stcb);
1947         }
1948         if (how_indx < sizeof(asoc->cookie_how))
1949                 asoc->cookie_how[how_indx] = 16;
1950         /* all other cases... */
1951         SCTP_TCB_UNLOCK(stcb);
1952         return (NULL);
1953 }
1954
1955 /*
1956  * handle a state cookie for a new association m: input packet mbuf chain--
1957  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
1958  * and the cookie signature does not exist offset: offset into mbuf to the
1959  * cookie-echo chunk length: length of the cookie chunk to: where the init
1960  * was from returns a new TCB
1961  */
1962 static struct sctp_tcb *
1963 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1964     struct sockaddr *src, struct sockaddr *dst,
1965     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1966     struct sctp_inpcb *inp, struct sctp_nets **netp,
1967     struct sockaddr *init_src, int *notification,
1968     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1969     uint8_t mflowtype, uint32_t mflowid,
1970     uint32_t vrf_id, uint16_t port)
1971 {
1972         struct sctp_tcb *stcb;
1973         struct sctp_init_chunk *init_cp, init_buf;
1974         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1975         union sctp_sockstore store;
1976         struct sctp_association *asoc;
1977         int init_offset, initack_offset, initack_limit;
1978         int error = 0;
1979         uint8_t auth_chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
1980
1981         /*
1982          * find and validate the INIT chunk in the cookie (peer's info) the
1983          * INIT should start after the cookie-echo header struct (chunk
1984          * header, state cookie header struct)
1985          */
1986         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
1987         init_cp = (struct sctp_init_chunk *)
1988             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1989             (uint8_t *)&init_buf);
1990         if (init_cp == NULL) {
1991                 /* could not pull a INIT chunk in cookie */
1992                 SCTPDBG(SCTP_DEBUG_INPUT1,
1993                     "process_cookie_new: could not pull INIT chunk hdr\n");
1994                 return (NULL);
1995         }
1996         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1997                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
1998                 return (NULL);
1999         }
2000         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
2001         /*
2002          * find and validate the INIT-ACK chunk in the cookie (my info) the
2003          * INIT-ACK follows the INIT chunk
2004          */
2005         initack_cp = (struct sctp_init_ack_chunk *)
2006             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
2007             (uint8_t *)&initack_buf);
2008         if (initack_cp == NULL) {
2009                 /* could not pull INIT-ACK chunk in cookie */
2010                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2011                 return (NULL);
2012         }
2013         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2014                 return (NULL);
2015         }
2016         /*
2017          * NOTE: We can't use the INIT_ACK's chk_length to determine the
2018          * "initack_limit" value.  This is because the chk_length field
2019          * includes the length of the cookie, but the cookie is omitted when
2020          * the INIT and INIT_ACK are tacked onto the cookie...
2021          */
2022         initack_limit = offset + cookie_len;
2023
2024         /*
2025          * now that we know the INIT/INIT-ACK are in place, create a new TCB
2026          * and popluate
2027          */
2028
2029         /*
2030          * Here we do a trick, we set in NULL for the proc/thread argument.
2031          * We do this since in effect we only use the p argument when the
2032          * socket is unbound and we must do an implicit bind. Since we are
2033          * getting a cookie, we cannot be unbound.
2034          */
2035         stcb = sctp_aloc_assoc(inp, init_src, &error,
2036             ntohl(initack_cp->init.initiate_tag),
2037             ntohl(initack_cp->init.initial_tsn), vrf_id,
2038             ntohs(initack_cp->init.num_outbound_streams),
2039             port,
2040             (struct thread *)NULL,
2041             SCTP_DONT_INITIALIZE_AUTH_PARAMS);
2042         if (stcb == NULL) {
2043                 struct mbuf *op_err;
2044
2045                 /* memory problem? */
2046                 SCTPDBG(SCTP_DEBUG_INPUT1,
2047                     "process_cookie_new: no room for another TCB!\n");
2048                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2049                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2050                     src, dst, sh, op_err,
2051                     mflowtype, mflowid,
2052                     vrf_id, port);
2053                 return (NULL);
2054         }
2055         asoc = &stcb->asoc;
2056         /* get scope variables out of cookie */
2057         asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
2058         asoc->scope.site_scope = cookie->site_scope;
2059         asoc->scope.local_scope = cookie->local_scope;
2060         asoc->scope.loopback_scope = cookie->loopback_scope;
2061
2062         if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2063             (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2064                 struct mbuf *op_err;
2065
2066                 /*
2067                  * Houston we have a problem. The EP changed while the
2068                  * cookie was in flight. Only recourse is to abort the
2069                  * association.
2070                  */
2071                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2072                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2073                     src, dst, sh, op_err,
2074                     mflowtype, mflowid,
2075                     vrf_id, port);
2076                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2077                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2078                 return (NULL);
2079         }
2080         /* process the INIT-ACK info (my info) */
2081         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2082
2083         /* process the INIT info (peer's info) */
2084         if (sctp_process_init(init_cp, stcb) < 0) {
2085                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2086                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2087                 return (NULL);
2088         }
2089         /* load all addresses */
2090         if (sctp_load_addresses_from_init(stcb, m,
2091             init_offset + sizeof(struct sctp_init_chunk),
2092             initack_offset, src, dst, init_src, port) < 0) {
2093                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2094                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2095                 return (NULL);
2096         }
2097         /*
2098          * verify any preceding AUTH chunk that was skipped
2099          */
2100         /* pull the local authentication parameters from the cookie/init-ack */
2101         sctp_auth_get_cookie_params(stcb, m,
2102             initack_offset + sizeof(struct sctp_init_ack_chunk),
2103             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2104         if (auth_skipped) {
2105                 struct sctp_auth_chunk *auth;
2106
2107                 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) {
2108                         auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2109                 } else {
2110                         auth = NULL;
2111                 }
2112                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2113                         /* auth HMAC failed, dump the assoc and packet */
2114                         SCTPDBG(SCTP_DEBUG_AUTH1,
2115                             "COOKIE-ECHO: AUTH failed\n");
2116                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2117                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_21);
2118                         return (NULL);
2119                 } else {
2120                         /* remaining chunks checked... good to go */
2121                         stcb->asoc.authenticated = 1;
2122                 }
2123         }
2124
2125         /*
2126          * if we're doing ASCONFs, check to see if we have any new local
2127          * addresses that need to get added to the peer (eg. addresses
2128          * changed while cookie echo in flight).  This needs to be done
2129          * after we go to the OPEN state to do the correct asconf
2130          * processing. else, make sure we have the correct addresses in our
2131          * lists
2132          */
2133
2134         /* warning, we re-use sin, sin6, sa_store here! */
2135         /* pull in local_address (our "from" address) */
2136         switch (cookie->laddr_type) {
2137 #ifdef INET
2138         case SCTP_IPV4_ADDRESS:
2139                 /* source addr is IPv4 */
2140                 memset(&store.sin, 0, sizeof(struct sockaddr_in));
2141                 store.sin.sin_family = AF_INET;
2142                 store.sin.sin_len = sizeof(struct sockaddr_in);
2143                 store.sin.sin_addr.s_addr = cookie->laddress[0];
2144                 break;
2145 #endif
2146 #ifdef INET6
2147         case SCTP_IPV6_ADDRESS:
2148                 /* source addr is IPv6 */
2149                 memset(&store.sin6, 0, sizeof(struct sockaddr_in6));
2150                 store.sin6.sin6_family = AF_INET6;
2151                 store.sin6.sin6_len = sizeof(struct sockaddr_in6);
2152                 store.sin6.sin6_scope_id = cookie->scope_id;
2153                 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr));
2154                 break;
2155 #endif
2156         default:
2157                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2158                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
2159                 return (NULL);
2160         }
2161
2162         /* update current state */
2163         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2164         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
2165         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2166                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2167                     stcb->sctp_ep, stcb, NULL);
2168         }
2169         sctp_stop_all_cookie_timers(stcb);
2170         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2171         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2172
2173         /* set up to notify upper layer */
2174         *notification = SCTP_NOTIFY_ASSOC_UP;
2175         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2176             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2177             (!SCTP_IS_LISTENING(inp))) {
2178                 /*
2179                  * This is an endpoint that called connect() how it got a
2180                  * cookie that is NEW is a bit of a mystery. It must be that
2181                  * the INIT was sent, but before it got there.. a complete
2182                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2183                  * should have went to the other code.. not here.. oh well..
2184                  * a bit of protection is worth having..
2185                  *
2186                  * XXXMJ unlocked
2187                  */
2188                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2189                 soisconnected(stcb->sctp_socket);
2190         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2191             (SCTP_IS_LISTENING(inp))) {
2192                 /*
2193                  * We don't want to do anything with this one. Since it is
2194                  * the listening guy. The timer will get started for
2195                  * accepted connections in the caller.
2196                  */
2197                 ;
2198         }
2199         if (stcb->asoc.sctp_autoclose_ticks &&
2200             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2201                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2202         }
2203         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2204         *netp = sctp_findnet(stcb, init_src);
2205         if (*netp != NULL) {
2206                 struct timeval old;
2207
2208                 /*
2209                  * Since we did not send a HB, make sure we don't double
2210                  * things.
2211                  */
2212                 (*netp)->hb_responded = 1;
2213                 /* Calculate the RTT. */
2214                 old.tv_sec = cookie->time_entered.tv_sec;
2215                 old.tv_usec = cookie->time_entered.tv_usec;
2216                 sctp_calculate_rto(stcb, asoc, *netp, &old, SCTP_RTT_FROM_NON_DATA);
2217         }
2218         /* respond with a COOKIE-ACK */
2219         sctp_send_cookie_ack(stcb);
2220
2221         /*
2222          * check the address lists for any ASCONFs that need to be sent
2223          * AFTER the cookie-ack is sent
2224          */
2225         sctp_check_address_list(stcb, m,
2226             initack_offset + sizeof(struct sctp_init_ack_chunk),
2227             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2228             &store.sa, cookie->local_scope, cookie->site_scope,
2229             cookie->ipv4_scope, cookie->loopback_scope);
2230
2231         return (stcb);
2232 }
2233
2234 /*
2235  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2236  * we NEED to make sure we are not already using the vtag. If so we
2237  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2238         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2239                                                             SCTP_BASE_INFO(hashasocmark))];
2240         LIST_FOREACH(stcb, head, sctp_asocs) {
2241                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2242                        -- SEND ABORT - TRY AGAIN --
2243                 }
2244         }
2245 */
2246
2247 /*
2248  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2249  * existing (non-NULL) TCB
2250  */
2251 static struct mbuf *
2252 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2253     struct sockaddr *src, struct sockaddr *dst,
2254     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2255     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2256     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2257     struct sctp_tcb **locked_tcb,
2258     uint8_t mflowtype, uint32_t mflowid,
2259     uint32_t vrf_id, uint16_t port)
2260 {
2261         struct sctp_state_cookie *cookie;
2262         struct sctp_tcb *l_stcb = *stcb;
2263         struct sctp_inpcb *l_inp;
2264         struct sockaddr *to;
2265         struct sctp_pcb *ep;
2266         struct mbuf *m_sig;
2267         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2268         uint8_t *sig;
2269         uint8_t cookie_ok = 0;
2270         unsigned int sig_offset, cookie_offset;
2271         unsigned int cookie_len;
2272         struct timeval now;
2273         struct timeval time_entered, time_expires;
2274         int notification = 0;
2275         struct sctp_nets *netl;
2276         int had_a_existing_tcb = 0;
2277         int send_int_conf = 0;
2278 #ifdef INET
2279         struct sockaddr_in sin;
2280 #endif
2281 #ifdef INET6
2282         struct sockaddr_in6 sin6;
2283 #endif
2284
2285         SCTPDBG(SCTP_DEBUG_INPUT2,
2286             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2287
2288         if (inp_p == NULL) {
2289                 return (NULL);
2290         }
2291         cookie = &cp->cookie;
2292         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2293         cookie_len = ntohs(cp->ch.chunk_length);
2294
2295         if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2296             sizeof(struct sctp_init_chunk) +
2297             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2298                 /* cookie too small */
2299                 return (NULL);
2300         }
2301         if ((cookie->peerport != sh->src_port) ||
2302             (cookie->myport != sh->dest_port) ||
2303             (cookie->my_vtag != sh->v_tag)) {
2304                 /*
2305                  * invalid ports or bad tag.  Note that we always leave the
2306                  * v_tag in the header in network order and when we stored
2307                  * it in the my_vtag slot we also left it in network order.
2308                  * This maintains the match even though it may be in the
2309                  * opposite byte order of the machine :->
2310                  */
2311                 return (NULL);
2312         }
2313         /*
2314          * split off the signature into its own mbuf (since it should not be
2315          * calculated in the sctp_hmac_m() call).
2316          */
2317         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2318         m_sig = m_split(m, sig_offset, M_NOWAIT);
2319         if (m_sig == NULL) {
2320                 /* out of memory or ?? */
2321                 return (NULL);
2322         }
2323 #ifdef SCTP_MBUF_LOGGING
2324         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2325                 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT);
2326         }
2327 #endif
2328
2329         /*
2330          * compute the signature/digest for the cookie
2331          */
2332         ep = &(*inp_p)->sctp_ep;
2333         l_inp = *inp_p;
2334         if (l_stcb) {
2335                 SCTP_TCB_UNLOCK(l_stcb);
2336         }
2337         SCTP_INP_RLOCK(l_inp);
2338         if (l_stcb) {
2339                 SCTP_TCB_LOCK(l_stcb);
2340         }
2341         /* which cookie is it? */
2342         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2343             (ep->current_secret_number != ep->last_secret_number)) {
2344                 /* it's the old cookie */
2345                 (void)sctp_hmac_m(SCTP_HMAC,
2346                     (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2347                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2348         } else {
2349                 /* it's the current cookie */
2350                 (void)sctp_hmac_m(SCTP_HMAC,
2351                     (uint8_t *)ep->secret_key[(int)ep->current_secret_number],
2352                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2353         }
2354         /* get the signature */
2355         SCTP_INP_RUNLOCK(l_inp);
2356         sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig);
2357         if (sig == NULL) {
2358                 /* couldn't find signature */
2359                 sctp_m_freem(m_sig);
2360                 return (NULL);
2361         }
2362         /* compare the received digest with the computed digest */
2363         if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2364                 /* try the old cookie? */
2365                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2366                     (ep->current_secret_number != ep->last_secret_number)) {
2367                         /* compute digest with old */
2368                         (void)sctp_hmac_m(SCTP_HMAC,
2369                             (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2370                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2371                         /* compare */
2372                         if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2373                                 cookie_ok = 1;
2374                 }
2375         } else {
2376                 cookie_ok = 1;
2377         }
2378
2379         /*
2380          * Now before we continue we must reconstruct our mbuf so that
2381          * normal processing of any other chunks will work.
2382          */
2383         {
2384                 struct mbuf *m_at;
2385
2386                 m_at = m;
2387                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2388                         m_at = SCTP_BUF_NEXT(m_at);
2389                 }
2390                 SCTP_BUF_NEXT(m_at) = m_sig;
2391         }
2392
2393         if (cookie_ok == 0) {
2394                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2395                 SCTPDBG(SCTP_DEBUG_INPUT2,
2396                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2397                     (uint32_t)offset, cookie_offset, sig_offset);
2398                 return (NULL);
2399         }
2400
2401         if (sctp_ticks_to_msecs(cookie->cookie_life) > SCTP_MAX_COOKIE_LIFE) {
2402                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: Invalid cookie lifetime\n");
2403                 return (NULL);
2404         }
2405         time_entered.tv_sec = cookie->time_entered.tv_sec;
2406         time_entered.tv_usec = cookie->time_entered.tv_usec;
2407         if ((time_entered.tv_sec < 0) ||
2408             (time_entered.tv_usec < 0) ||
2409             (time_entered.tv_usec >= 1000000)) {
2410                 /* Invalid time stamp. Cookie must have been modified. */
2411                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: Invalid time stamp\n");
2412                 return (NULL);
2413         }
2414         (void)SCTP_GETTIME_TIMEVAL(&now);
2415         if (timevalcmp(&now, &time_entered, <)) {
2416                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie generated in the future!\n");
2417                 return (NULL);
2418         }
2419         /*
2420          * Check the cookie timestamps to be sure it's not stale.
2421          * cookie_life is in ticks, so we convert to seconds.
2422          */
2423         time_expires.tv_sec = time_entered.tv_sec + sctp_ticks_to_secs(cookie->cookie_life);
2424         time_expires.tv_usec = time_entered.tv_usec;
2425         if (timevalcmp(&now, &time_expires, >)) {
2426                 /* cookie is stale! */
2427                 struct mbuf *op_err;
2428                 struct sctp_error_stale_cookie *cause;
2429                 struct timeval diff;
2430                 uint32_t staleness;
2431
2432                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie),
2433                     0, M_NOWAIT, 1, MT_DATA);
2434                 if (op_err == NULL) {
2435                         /* FOOBAR */
2436                         return (NULL);
2437                 }
2438                 /* Set the len */
2439                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie);
2440                 cause = mtod(op_err, struct sctp_error_stale_cookie *);
2441                 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE);
2442                 cause->cause.length = htons(sizeof(struct sctp_error_stale_cookie));
2443                 diff = now;
2444                 timevalsub(&diff, &time_expires);
2445                 if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) {
2446                         staleness = UINT32_MAX;
2447                 } else {
2448                         staleness = (uint32_t)diff.tv_sec * 1000000;
2449                 }
2450                 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) {
2451                         staleness += (uint32_t)diff.tv_usec;
2452                 } else {
2453                         staleness = UINT32_MAX;
2454                 }
2455                 cause->stale_time = htonl(staleness);
2456                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
2457                     mflowtype, mflowid, l_inp->fibnum,
2458                     vrf_id, port);
2459                 return (NULL);
2460         }
2461         /*
2462          * Now we must see with the lookup address if we have an existing
2463          * asoc. This will only happen if we were in the COOKIE-WAIT state
2464          * and a INIT collided with us and somewhere the peer sent the
2465          * cookie on another address besides the single address our assoc
2466          * had for him. In this case we will have one of the tie-tags set at
2467          * least AND the address field in the cookie can be used to look it
2468          * up.
2469          */
2470         to = NULL;
2471         switch (cookie->addr_type) {
2472 #ifdef INET6
2473         case SCTP_IPV6_ADDRESS:
2474                 memset(&sin6, 0, sizeof(sin6));
2475                 sin6.sin6_family = AF_INET6;
2476                 sin6.sin6_len = sizeof(sin6);
2477                 sin6.sin6_port = sh->src_port;
2478                 sin6.sin6_scope_id = cookie->scope_id;
2479                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2480                     sizeof(sin6.sin6_addr.s6_addr));
2481                 to = (struct sockaddr *)&sin6;
2482                 break;
2483 #endif
2484 #ifdef INET
2485         case SCTP_IPV4_ADDRESS:
2486                 memset(&sin, 0, sizeof(sin));
2487                 sin.sin_family = AF_INET;
2488                 sin.sin_len = sizeof(sin);
2489                 sin.sin_port = sh->src_port;
2490                 sin.sin_addr.s_addr = cookie->address[0];
2491                 to = (struct sockaddr *)&sin;
2492                 break;
2493 #endif
2494         default:
2495                 /* This should not happen */
2496                 return (NULL);
2497         }
2498         if (*stcb == NULL) {
2499                 /* Yep, lets check */
2500                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
2501                 if (*stcb == NULL) {
2502                         /*
2503                          * We should have only got back the same inp. If we
2504                          * got back a different ep we have a problem. The
2505                          * original findep got back l_inp and now
2506                          */
2507                         if (l_inp != *inp_p) {
2508                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2509                         }
2510                 } else {
2511                         if (*locked_tcb == NULL) {
2512                                 /*
2513                                  * In this case we found the assoc only
2514                                  * after we locked the create lock. This
2515                                  * means we are in a colliding case and we
2516                                  * must make sure that we unlock the tcb if
2517                                  * its one of the cases where we throw away
2518                                  * the incoming packets.
2519                                  */
2520                                 *locked_tcb = *stcb;
2521
2522                                 /*
2523                                  * We must also increment the inp ref count
2524                                  * since the ref_count flags was set when we
2525                                  * did not find the TCB, now we found it
2526                                  * which reduces the refcount.. we must
2527                                  * raise it back out to balance it all :-)
2528                                  */
2529                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2530                                 if ((*stcb)->sctp_ep != l_inp) {
2531                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2532                                             (void *)(*stcb)->sctp_ep, (void *)l_inp);
2533                                 }
2534                         }
2535                 }
2536         }
2537
2538         cookie_len -= SCTP_SIGNATURE_SIZE;
2539         if (*stcb == NULL) {
2540                 /* this is the "normal" case... get a new TCB */
2541                 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
2542                     cookie, cookie_len, *inp_p,
2543                     netp, to, &notification,
2544                     auth_skipped, auth_offset, auth_len,
2545                     mflowtype, mflowid,
2546                     vrf_id, port);
2547         } else {
2548                 /* this is abnormal... cookie-echo on existing TCB */
2549                 had_a_existing_tcb = 1;
2550                 *stcb = sctp_process_cookie_existing(m, iphlen, offset,
2551                     src, dst, sh,
2552                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2553                     &notification, auth_skipped, auth_offset, auth_len,
2554                     mflowtype, mflowid,
2555                     vrf_id, port);
2556                 if (*stcb == NULL) {
2557                         *locked_tcb = NULL;
2558                 }
2559         }
2560
2561         if (*stcb == NULL) {
2562                 /* still no TCB... must be bad cookie-echo */
2563                 return (NULL);
2564         }
2565         if (*netp != NULL) {
2566                 (*netp)->flowtype = mflowtype;
2567                 (*netp)->flowid = mflowid;
2568         }
2569         /*
2570          * Ok, we built an association so confirm the address we sent the
2571          * INIT-ACK to.
2572          */
2573         netl = sctp_findnet(*stcb, to);
2574         /*
2575          * This code should in theory NOT run but
2576          */
2577         if (netl == NULL) {
2578                 /* TSNH! Huh, why do I need to add this address here? */
2579                 if (sctp_add_remote_addr(*stcb, to, NULL, port,
2580                     SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2581                         return (NULL);
2582                 }
2583                 netl = sctp_findnet(*stcb, to);
2584         }
2585         if (netl) {
2586                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2587                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2588                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2589                             netl);
2590                         send_int_conf = 1;
2591                 }
2592         }
2593         sctp_start_net_timers(*stcb);
2594         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2595                 if (!had_a_existing_tcb ||
2596                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2597                         /*
2598                          * If we have a NEW cookie or the connect never
2599                          * reached the connected state during collision we
2600                          * must do the TCP accept thing.
2601                          */
2602                         struct socket *so, *oso;
2603                         struct sctp_inpcb *inp;
2604
2605                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2606                                 /*
2607                                  * For a restart we will keep the same
2608                                  * socket, no need to do anything. I THINK!!
2609                                  */
2610                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2611                                 if (send_int_conf) {
2612                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2613                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2614                                 }
2615                                 return (m);
2616                         }
2617                         oso = (*inp_p)->sctp_socket;
2618                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2619                         SCTP_TCB_UNLOCK((*stcb));
2620                         CURVNET_SET(oso->so_vnet);
2621                         so = sonewconn(oso, 0
2622                             );
2623                         CURVNET_RESTORE();
2624                         SCTP_TCB_LOCK((*stcb));
2625                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2626
2627                         if (so == NULL) {
2628                                 struct mbuf *op_err;
2629
2630                                 /* Too many sockets */
2631                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2632                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2633                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2634                                     src, dst, sh, op_err,
2635                                     mflowtype, mflowid,
2636                                     vrf_id, port);
2637                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC,
2638                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
2639                                 return (NULL);
2640                         }
2641                         inp = (struct sctp_inpcb *)so->so_pcb;
2642                         SCTP_INP_INCR_REF(inp);
2643                         /*
2644                          * We add the unbound flag here so that if we get an
2645                          * soabort() before we get the move_pcb done, we
2646                          * will properly cleanup.
2647                          */
2648                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2649                             SCTP_PCB_FLAGS_CONNECTED |
2650                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2651                             SCTP_PCB_FLAGS_UNBOUND |
2652                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2653                             SCTP_PCB_FLAGS_DONT_WAKE);
2654                         inp->sctp_features = (*inp_p)->sctp_features;
2655                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2656                         inp->sctp_socket = so;
2657                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2658                         inp->max_cwnd = (*inp_p)->max_cwnd;
2659                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2660                         inp->ecn_supported = (*inp_p)->ecn_supported;
2661                         inp->prsctp_supported = (*inp_p)->prsctp_supported;
2662                         inp->auth_supported = (*inp_p)->auth_supported;
2663                         inp->asconf_supported = (*inp_p)->asconf_supported;
2664                         inp->reconfig_supported = (*inp_p)->reconfig_supported;
2665                         inp->nrsack_supported = (*inp_p)->nrsack_supported;
2666                         inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
2667                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2668                         inp->sctp_context = (*inp_p)->sctp_context;
2669                         inp->local_strreset_support = (*inp_p)->local_strreset_support;
2670                         inp->fibnum = (*inp_p)->fibnum;
2671                         /*
2672                          * copy in the authentication parameters from the
2673                          * original endpoint
2674                          */
2675                         if (inp->sctp_ep.local_hmacs)
2676                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2677                         inp->sctp_ep.local_hmacs =
2678                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2679                         if (inp->sctp_ep.local_auth_chunks)
2680                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2681                         inp->sctp_ep.local_auth_chunks =
2682                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2683
2684                         /*
2685                          * Now we must move it from one hash table to
2686                          * another and get the tcb in the right place.
2687                          */
2688
2689                         /*
2690                          * This is where the one-2-one socket is put into
2691                          * the accept state waiting for the accept!
2692                          */
2693                         if (*stcb) {
2694                                 SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE);
2695                         }
2696                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2697
2698                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2699                         SCTP_TCB_UNLOCK((*stcb));
2700
2701                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2702                             0);
2703                         SCTP_TCB_LOCK((*stcb));
2704                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2705
2706                         /*
2707                          * now we must check to see if we were aborted while
2708                          * the move was going on and the lock/unlock
2709                          * happened.
2710                          */
2711                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2712                                 /*
2713                                  * yep it was, we leave the assoc attached
2714                                  * to the socket since the sctp_inpcb_free()
2715                                  * call will send an abort for us.
2716                                  */
2717                                 SCTP_INP_DECR_REF(inp);
2718                                 return (NULL);
2719                         }
2720                         SCTP_INP_DECR_REF(inp);
2721                         /* Switch over to the new guy */
2722                         *inp_p = inp;
2723                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2724                         if (send_int_conf) {
2725                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2726                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2727                         }
2728
2729                         /*
2730                          * Pull it from the incomplete queue and wake the
2731                          * guy
2732                          */
2733                         soisconnected(so);
2734                         return (m);
2735                 }
2736         }
2737         if (notification) {
2738                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2739         }
2740         if (send_int_conf) {
2741                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2742                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2743         }
2744         return (m);
2745 }
2746
2747 static void
2748 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2749     struct sctp_tcb *stcb, struct sctp_nets *net)
2750 {
2751         /* cp must not be used, others call this without a c-ack :-) */
2752         struct sctp_association *asoc;
2753         struct sctp_tmit_chunk *chk;
2754
2755         SCTPDBG(SCTP_DEBUG_INPUT2,
2756             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2757         if ((stcb == NULL) || (net == NULL)) {
2758                 return;
2759         }
2760
2761         asoc = &stcb->asoc;
2762         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
2763                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
2764                     asoc->overall_error_count,
2765                     0,
2766                     SCTP_FROM_SCTP_INPUT,
2767                     __LINE__);
2768         }
2769         asoc->overall_error_count = 0;
2770         sctp_stop_all_cookie_timers(stcb);
2771         /* process according to association state */
2772         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) {
2773                 /* state change only needed when I am in right state */
2774                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2775                 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
2776                 sctp_start_net_timers(stcb);
2777                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2778                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2779                             stcb->sctp_ep, stcb, NULL);
2780                 }
2781                 /* update RTO */
2782                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2783                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2784                 if (asoc->overall_error_count == 0) {
2785                         sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered,
2786                             SCTP_RTT_FROM_NON_DATA);
2787                 }
2788                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2789                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2790                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2791                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2792                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2793                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
2794                                 soisconnected(stcb->sctp_socket);
2795                         }
2796                 }
2797                 /*
2798                  * since we did not send a HB make sure we don't double
2799                  * things
2800                  */
2801                 net->hb_responded = 1;
2802
2803                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2804                         /*
2805                          * We don't need to do the asconf thing, nor hb or
2806                          * autoclose if the socket is closed.
2807                          */
2808                         goto closed_socket;
2809                 }
2810
2811                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2812                     stcb, net);
2813
2814                 if (stcb->asoc.sctp_autoclose_ticks &&
2815                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2816                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2817                             stcb->sctp_ep, stcb, NULL);
2818                 }
2819                 /*
2820                  * send ASCONF if parameters are pending and ASCONFs are
2821                  * allowed (eg. addresses changed when init/cookie echo were
2822                  * in flight)
2823                  */
2824                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2825                     (stcb->asoc.asconf_supported == 1) &&
2826                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2827 #ifdef SCTP_TIMER_BASED_ASCONF
2828                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2829                             stcb->sctp_ep, stcb,
2830                             stcb->asoc.primary_destination);
2831 #else
2832                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2833                             SCTP_ADDR_NOT_LOCKED);
2834 #endif
2835                 }
2836         }
2837 closed_socket:
2838         /* Toss the cookie if I can */
2839         sctp_toss_old_cookies(stcb, asoc);
2840         /* Restart the timer if we have pending data */
2841         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
2842                 if (chk->whoTo != NULL) {
2843                         break;
2844                 }
2845         }
2846         if (chk != NULL) {
2847                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
2848         }
2849 }
2850
2851 static void
2852 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
2853     struct sctp_tcb *stcb)
2854 {
2855         struct sctp_nets *net;
2856         struct sctp_tmit_chunk *lchk;
2857         struct sctp_ecne_chunk bkup;
2858         uint8_t override_bit;
2859         uint32_t tsn, window_data_tsn;
2860         int len;
2861         unsigned int pkt_cnt;
2862
2863         len = ntohs(cp->ch.chunk_length);
2864         if (len == sizeof(struct old_sctp_ecne_chunk)) {
2865                 /* Its the old format */
2866                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
2867                 bkup.num_pkts_since_cwr = htonl(1);
2868                 cp = &bkup;
2869         }
2870         SCTP_STAT_INCR(sctps_recvecne);
2871         tsn = ntohl(cp->tsn);
2872         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
2873         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
2874         if (lchk == NULL) {
2875                 window_data_tsn = stcb->asoc.sending_seq - 1;
2876         } else {
2877                 window_data_tsn = lchk->rec.data.tsn;
2878         }
2879
2880         /* Find where it was sent to if possible. */
2881         net = NULL;
2882         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
2883                 if (lchk->rec.data.tsn == tsn) {
2884                         net = lchk->whoTo;
2885                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
2886                         break;
2887                 }
2888                 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) {
2889                         break;
2890                 }
2891         }
2892         if (net == NULL) {
2893                 /*
2894                  * What to do. A previous send of a CWR was possibly lost.
2895                  * See how old it is, we may have it marked on the actual
2896                  * net.
2897                  */
2898                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
2899                         if (tsn == net->last_cwr_tsn) {
2900                                 /* Found him, send it off */
2901                                 break;
2902                         }
2903                 }
2904                 if (net == NULL) {
2905                         /*
2906                          * If we reach here, we need to send a special CWR
2907                          * that says hey, we did this a long time ago and
2908                          * you lost the response.
2909                          */
2910                         net = TAILQ_FIRST(&stcb->asoc.nets);
2911                         if (net == NULL) {
2912                                 /* TSNH */
2913                                 return;
2914                         }
2915                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
2916                 } else {
2917                         override_bit = 0;
2918                 }
2919         } else {
2920                 override_bit = 0;
2921         }
2922         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
2923             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
2924                 /*
2925                  * JRS - Use the congestion control given in the pluggable
2926                  * CC module
2927                  */
2928                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
2929                 /*
2930                  * We reduce once every RTT. So we will only lower cwnd at
2931                  * the next sending seq i.e. the window_data_tsn
2932                  */
2933                 net->cwr_window_tsn = window_data_tsn;
2934                 net->ecn_ce_pkt_cnt += pkt_cnt;
2935                 net->lost_cnt = pkt_cnt;
2936                 net->last_cwr_tsn = tsn;
2937         } else {
2938                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
2939                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
2940                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
2941                         /*
2942                          * Another loss in the same window update how many
2943                          * marks/packets lost we have had.
2944                          */
2945                         int cnt = 1;
2946
2947                         if (pkt_cnt > net->lost_cnt) {
2948                                 /* Should be the case */
2949                                 cnt = (pkt_cnt - net->lost_cnt);
2950                                 net->ecn_ce_pkt_cnt += cnt;
2951                         }
2952                         net->lost_cnt = pkt_cnt;
2953                         net->last_cwr_tsn = tsn;
2954                         /*
2955                          * Most CC functions will ignore this call, since we
2956                          * are in-window yet of the initial CE the peer saw.
2957                          */
2958                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
2959                 }
2960         }
2961         /*
2962          * We always send a CWR this way if our previous one was lost our
2963          * peer will get an update, or if it is not time again to reduce we
2964          * still get the cwr to the peer. Note we set the override when we
2965          * could not find the TSN on the chunk or the destination network.
2966          */
2967         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
2968 }
2969
2970 static void
2971 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
2972 {
2973         /*
2974          * Here we get a CWR from the peer. We must look in the outqueue and
2975          * make sure that we have a covered ECNE in the control chunk part.
2976          * If so remove it.
2977          */
2978         struct sctp_tmit_chunk *chk, *nchk;
2979         struct sctp_ecne_chunk *ecne;
2980         int override;
2981         uint32_t cwr_tsn;
2982
2983         cwr_tsn = ntohl(cp->tsn);
2984         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
2985         TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) {
2986                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
2987                         continue;
2988                 }
2989                 if ((override == 0) && (chk->whoTo != net)) {
2990                         /* Must be from the right src unless override is set */
2991                         continue;
2992                 }
2993                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
2994                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
2995                         /* this covers this ECNE, we can remove it */
2996                         stcb->asoc.ecn_echo_cnt_onq--;
2997                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
2998                             sctp_next);
2999                         stcb->asoc.ctrl_queue_cnt--;
3000                         sctp_m_freem(chk->data);
3001                         chk->data = NULL;
3002                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3003                         if (override == 0) {
3004                                 break;
3005                         }
3006                 }
3007         }
3008 }
3009
3010 static void
3011 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3012     struct sctp_tcb *stcb, struct sctp_nets *net)
3013 {
3014
3015         SCTPDBG(SCTP_DEBUG_INPUT2,
3016             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3017         if (stcb == NULL)
3018                 return;
3019
3020         /* process according to association state */
3021         if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3022                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3023                 SCTPDBG(SCTP_DEBUG_INPUT2,
3024                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3025                 SCTP_TCB_UNLOCK(stcb);
3026                 return;
3027         }
3028         /* notify upper layer protocol */
3029         if (stcb->sctp_socket) {
3030                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3031         }
3032 #ifdef INVARIANTS
3033         if (!TAILQ_EMPTY(&stcb->asoc.send_queue) ||
3034             !TAILQ_EMPTY(&stcb->asoc.sent_queue) ||
3035             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
3036                 panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
3037         }
3038 #endif
3039         /* stop the timer */
3040         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net,
3041             SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3042         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3043         /* free the TCB */
3044         SCTPDBG(SCTP_DEBUG_INPUT2,
3045             "sctp_handle_shutdown_complete: calls free-asoc\n");
3046         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
3047             SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3048         return;
3049 }
3050
3051 static int
3052 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3053     struct sctp_nets *net, uint8_t flg)
3054 {
3055         switch (desc->chunk_type) {
3056         case SCTP_DATA:
3057         case SCTP_IDATA:
3058                 /* find the tsn to resend (possibly) */
3059                 {
3060                         uint32_t tsn;
3061                         struct sctp_tmit_chunk *tp1;
3062
3063                         tsn = ntohl(desc->tsn_ifany);
3064                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3065                                 if (tp1->rec.data.tsn == tsn) {
3066                                         /* found it */
3067                                         break;
3068                                 }
3069                                 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) {
3070                                         /* not found */
3071                                         tp1 = NULL;
3072                                         break;
3073                                 }
3074                         }
3075                         if (tp1 == NULL) {
3076                                 /*
3077                                  * Do it the other way , aka without paying
3078                                  * attention to queue seq order.
3079                                  */
3080                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3081                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3082                                         if (tp1->rec.data.tsn == tsn) {
3083                                                 /* found it */
3084                                                 break;
3085                                         }
3086                                 }
3087                         }
3088                         if (tp1 == NULL) {
3089                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3090                         }
3091                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3092                                 if (((flg & SCTP_BADCRC) == 0) &&
3093                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3094                                         return (0);
3095                                 }
3096                                 if ((stcb->asoc.peers_rwnd == 0) &&
3097                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3098                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3099                                         return (0);
3100                                 }
3101                                 if (stcb->asoc.peers_rwnd == 0 &&
3102                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3103                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3104                                         return (0);
3105                                 }
3106                                 if ((uint32_t)SCTP_BUF_LEN(tp1->data) <
3107                                     SCTP_DATA_CHUNK_OVERHEAD(stcb) + SCTP_NUM_DB_TO_VERIFY) {
3108                                         /* Payload not matching. */
3109                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3110                                         return (-1);
3111                                 }
3112                                 if (memcmp(mtod(tp1->data, caddr_t)+SCTP_DATA_CHUNK_OVERHEAD(stcb),
3113                                     desc->data_bytes, SCTP_NUM_DB_TO_VERIFY) != 0) {
3114                                         /* Payload not matching. */
3115                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3116                                         return (-1);
3117                                 }
3118                                 if (tp1->do_rtt) {
3119                                         /*
3120                                          * this guy had a RTO calculation
3121                                          * pending on it, cancel it
3122                                          */
3123                                         if (tp1->whoTo->rto_needed == 0) {
3124                                                 tp1->whoTo->rto_needed = 1;
3125                                         }
3126                                         tp1->do_rtt = 0;
3127                                 }
3128                                 SCTP_STAT_INCR(sctps_pdrpmark);
3129                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3130                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3131                                 /*
3132                                  * mark it as if we were doing a FR, since
3133                                  * we will be getting gap ack reports behind
3134                                  * the info from the router.
3135                                  */
3136                                 tp1->rec.data.doing_fast_retransmit = 1;
3137                                 /*
3138                                  * mark the tsn with what sequences can
3139                                  * cause a new FR.
3140                                  */
3141                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3142                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3143                                 } else {
3144                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn;
3145                                 }
3146
3147                                 /* restart the timer */
3148                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3149                                     stcb, tp1->whoTo,
3150                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3151                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3152                                     stcb, tp1->whoTo);
3153
3154                                 /* fix counts and things */
3155                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3156                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3157                                             tp1->whoTo->flight_size,
3158                                             tp1->book_size,
3159                                             (uint32_t)(uintptr_t)stcb,
3160                                             tp1->rec.data.tsn);
3161                                 }
3162                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3163                                         sctp_flight_size_decrease(tp1);
3164                                         sctp_total_flight_decrease(stcb, tp1);
3165                                 }
3166                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3167                         } {
3168                                 /* audit code */
3169                                 unsigned int audit;
3170
3171                                 audit = 0;
3172                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3173                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3174                                                 audit++;
3175                                 }
3176                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3177                                     sctp_next) {
3178                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3179                                                 audit++;
3180                                 }
3181                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3182                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3183                                             audit, stcb->asoc.sent_queue_retran_cnt);
3184 #ifndef SCTP_AUDITING_ENABLED
3185                                         stcb->asoc.sent_queue_retran_cnt = audit;
3186 #endif
3187                                 }
3188                         }
3189                 }
3190                 break;
3191         case SCTP_ASCONF:
3192                 {
3193                         struct sctp_tmit_chunk *asconf;
3194
3195                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3196                             sctp_next) {
3197                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3198                                         break;
3199                                 }
3200                         }
3201                         if (asconf) {
3202                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3203                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3204                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3205                                 asconf->snd_count--;
3206                         }
3207                 }
3208                 break;
3209         case SCTP_INITIATION:
3210                 /* resend the INIT */
3211                 stcb->asoc.dropped_special_cnt++;
3212                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3213                         /*
3214                          * If we can get it in, in a few attempts we do
3215                          * this, otherwise we let the timer fire.
3216                          */
3217                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3218                             stcb, net,
3219                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
3220                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3221                 }
3222                 break;
3223         case SCTP_SELECTIVE_ACK:
3224         case SCTP_NR_SELECTIVE_ACK:
3225                 /* resend the sack */
3226                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3227                 break;
3228         case SCTP_HEARTBEAT_REQUEST:
3229                 /* resend a demand HB */
3230                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3231                         /*
3232                          * Only retransmit if we KNOW we wont destroy the
3233                          * tcb
3234                          */
3235                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3236                 }
3237                 break;
3238         case SCTP_SHUTDOWN:
3239                 sctp_send_shutdown(stcb, net);
3240                 break;
3241         case SCTP_SHUTDOWN_ACK:
3242                 sctp_send_shutdown_ack(stcb, net);
3243                 break;
3244         case SCTP_COOKIE_ECHO:
3245                 {
3246                         struct sctp_tmit_chunk *cookie;
3247
3248                         cookie = NULL;
3249                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3250                             sctp_next) {
3251                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3252                                         break;
3253                                 }
3254                         }
3255                         if (cookie) {
3256                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3257                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3258                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3259                                 sctp_stop_all_cookie_timers(stcb);
3260                         }
3261                 }
3262                 break;
3263         case SCTP_COOKIE_ACK:
3264                 sctp_send_cookie_ack(stcb);
3265                 break;
3266         case SCTP_ASCONF_ACK:
3267                 /* resend last asconf ack */
3268                 sctp_send_asconf_ack(stcb);
3269                 break;
3270         case SCTP_IFORWARD_CUM_TSN:
3271         case SCTP_FORWARD_CUM_TSN:
3272                 send_forward_tsn(stcb, &stcb->asoc);
3273                 break;
3274                 /* can't do anything with these */
3275         case SCTP_PACKET_DROPPED:
3276         case SCTP_INITIATION_ACK:       /* this should not happen */
3277         case SCTP_HEARTBEAT_ACK:
3278         case SCTP_ABORT_ASSOCIATION:
3279         case SCTP_OPERATION_ERROR:
3280         case SCTP_SHUTDOWN_COMPLETE:
3281         case SCTP_ECN_ECHO:
3282         case SCTP_ECN_CWR:
3283         default:
3284                 break;
3285         }
3286         return (0);
3287 }
3288
3289 void
3290 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3291 {
3292         uint32_t i;
3293         uint16_t temp;
3294
3295         /*
3296          * We set things to 0xffffffff since this is the last delivered
3297          * sequence and we will be sending in 0 after the reset.
3298          */
3299
3300         if (number_entries) {
3301                 for (i = 0; i < number_entries; i++) {
3302                         temp = ntohs(list[i]);
3303                         if (temp >= stcb->asoc.streamincnt) {
3304                                 continue;
3305                         }
3306                         stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff;
3307                 }
3308         } else {
3309                 list = NULL;
3310                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3311                         stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
3312                 }
3313         }
3314         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3315 }
3316
3317 static void
3318 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3319 {
3320         uint32_t i;
3321         uint16_t temp;
3322
3323         if (number_entries > 0) {
3324                 for (i = 0; i < number_entries; i++) {
3325                         temp = ntohs(list[i]);
3326                         if (temp >= stcb->asoc.streamoutcnt) {
3327                                 /* no such stream */
3328                                 continue;
3329                         }
3330                         stcb->asoc.strmout[temp].next_mid_ordered = 0;
3331                         stcb->asoc.strmout[temp].next_mid_unordered = 0;
3332                 }
3333         } else {
3334                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3335                         stcb->asoc.strmout[i].next_mid_ordered = 0;
3336                         stcb->asoc.strmout[i].next_mid_unordered = 0;
3337                 }
3338         }
3339         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3340 }
3341
3342 static void
3343 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3344 {
3345         uint32_t i;
3346         uint16_t temp;
3347
3348         if (number_entries > 0) {
3349                 for (i = 0; i < number_entries; i++) {
3350                         temp = ntohs(list[i]);
3351                         if (temp >= stcb->asoc.streamoutcnt) {
3352                                 /* no such stream */
3353                                 continue;
3354                         }
3355                         stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN;
3356                 }
3357         } else {
3358                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3359                         stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN;
3360                 }
3361         }
3362 }
3363
3364 struct sctp_stream_reset_request *
3365 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3366 {
3367         struct sctp_association *asoc;
3368         struct sctp_chunkhdr *ch;
3369         struct sctp_stream_reset_request *r;
3370         struct sctp_tmit_chunk *chk;
3371         int len, clen;
3372
3373         asoc = &stcb->asoc;
3374         chk = asoc->str_reset;
3375         if (TAILQ_EMPTY(&asoc->control_send_queue) ||
3376             (chk == NULL)) {
3377                 asoc->stream_reset_outstanding = 0;
3378                 return (NULL);
3379         }
3380         if (chk->data == NULL) {
3381                 return (NULL);
3382         }
3383         if (bchk != NULL) {
3384                 /* he wants a copy of the chk pointer */
3385                 *bchk = chk;
3386         }
3387         clen = chk->send_size;
3388         ch = mtod(chk->data, struct sctp_chunkhdr *);
3389         r = (struct sctp_stream_reset_request *)(ch + 1);
3390         if (ntohl(r->request_seq) == seq) {
3391                 /* found it */
3392                 return (r);
3393         }
3394         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3395         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3396                 /* move to the next one, there can only be a max of two */
3397                 r = (struct sctp_stream_reset_request *)((caddr_t)r + len);
3398                 if (ntohl(r->request_seq) == seq) {
3399                         return (r);
3400                 }
3401         }
3402         /* that seq is not here */
3403         return (NULL);
3404 }
3405
3406 static void
3407 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3408 {
3409         struct sctp_association *asoc;
3410         struct sctp_tmit_chunk *chk;
3411
3412         asoc = &stcb->asoc;
3413         chk = asoc->str_reset;
3414         if (chk == NULL) {
3415                 return;
3416         }
3417         asoc->str_reset = NULL;
3418         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb,
3419             NULL, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28);
3420         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
3421         asoc->ctrl_queue_cnt--;
3422         if (chk->data) {
3423                 sctp_m_freem(chk->data);
3424                 chk->data = NULL;
3425         }
3426         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3427 }
3428
3429 static int
3430 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3431     uint32_t seq, uint32_t action,
3432     struct sctp_stream_reset_response *respin)
3433 {
3434         uint16_t type;
3435         int lparam_len;
3436         struct sctp_association *asoc = &stcb->asoc;
3437         struct sctp_tmit_chunk *chk;
3438         struct sctp_stream_reset_request *req_param;
3439         struct sctp_stream_reset_out_request *req_out_param;
3440         struct sctp_stream_reset_in_request *req_in_param;
3441         uint32_t number_entries;
3442
3443         if (asoc->stream_reset_outstanding == 0) {
3444                 /* duplicate */
3445                 return (0);
3446         }
3447         if (seq == stcb->asoc.str_reset_seq_out) {
3448                 req_param = sctp_find_stream_reset(stcb, seq, &chk);
3449                 if (req_param != NULL) {
3450                         stcb->asoc.str_reset_seq_out++;
3451                         type = ntohs(req_param->ph.param_type);
3452                         lparam_len = ntohs(req_param->ph.param_length);
3453                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3454                                 int no_clear = 0;
3455
3456                                 req_out_param = (struct sctp_stream_reset_out_request *)req_param;
3457                                 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3458                                 asoc->stream_reset_out_is_outstanding = 0;
3459                                 if (asoc->stream_reset_outstanding)
3460                                         asoc->stream_reset_outstanding--;
3461                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3462                                         /* do it */
3463                                         sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
3464                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3465                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3466                                 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) {
3467                                         /*
3468                                          * Set it up so we don't stop
3469                                          * retransmitting
3470                                          */
3471                                         asoc->stream_reset_outstanding++;
3472                                         stcb->asoc.str_reset_seq_out--;
3473                                         asoc->stream_reset_out_is_outstanding = 1;
3474                                         no_clear = 1;
3475                                 } else {
3476                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3477                                 }
3478                                 if (no_clear == 0) {
3479                                         sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams);
3480                                 }
3481                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3482                                 req_in_param = (struct sctp_stream_reset_in_request *)req_param;
3483                                 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3484                                 if (asoc->stream_reset_outstanding)
3485                                         asoc->stream_reset_outstanding--;
3486                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3487                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3488                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3489                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3490                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3491                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3492                                 }
3493                         } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3494                                 /* Ok we now may have more streams */
3495                                 int num_stream;
3496
3497                                 num_stream = stcb->asoc.strm_pending_add_size;
3498                                 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3499                                         /* TSNH */
3500                                         num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3501                                 }
3502                                 stcb->asoc.strm_pending_add_size = 0;
3503                                 if (asoc->stream_reset_outstanding)
3504                                         asoc->stream_reset_outstanding--;
3505                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3506                                         /* Put the new streams into effect */
3507                                         int i;
3508
3509                                         for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) {
3510                                                 asoc->strmout[i].state = SCTP_STREAM_OPEN;
3511                                         }
3512                                         asoc->streamoutcnt += num_stream;
3513                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3514                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3515                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3516                                             SCTP_STREAM_CHANGE_DENIED);
3517                                 } else {
3518                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3519                                             SCTP_STREAM_CHANGE_FAILED);
3520                                 }
3521                         } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3522                                 if (asoc->stream_reset_outstanding)
3523                                         asoc->stream_reset_outstanding--;
3524                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3525                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3526                                             SCTP_STREAM_CHANGE_DENIED);
3527                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3528                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3529                                             SCTP_STREAM_CHANGE_FAILED);
3530                                 }
3531                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3532                                 /**
3533                                  * a) Adopt the new in tsn.
3534                                  * b) reset the map
3535                                  * c) Adopt the new out-tsn
3536                                  */
3537                                 struct sctp_stream_reset_response_tsn *resp;
3538                                 struct sctp_forward_tsn_chunk fwdtsn;
3539                                 int abort_flag = 0;
3540
3541                                 if (respin == NULL) {
3542                                         /* huh ? */
3543                                         return (0);
3544                                 }
3545                                 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
3546                                         return (0);
3547                                 }
3548                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3549                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3550                                         asoc->stream_reset_outstanding--;
3551                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3552                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3553                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3554                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3555                                         if (abort_flag) {
3556                                                 return (1);
3557                                         }
3558                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3559                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3560                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3561                                         }
3562
3563                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3564                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3565                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3566
3567                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3568                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3569
3570                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3571                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3572
3573                                         sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3574                                         sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3575                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3576                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3577                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3578                                             SCTP_ASSOC_RESET_DENIED);
3579                                 } else {
3580                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3581                                             SCTP_ASSOC_RESET_FAILED);
3582                                 }
3583                         }
3584                         /* get rid of the request and get the request flags */
3585                         if (asoc->stream_reset_outstanding == 0) {
3586                                 sctp_clean_up_stream_reset(stcb);
3587                         }
3588                 }
3589         }
3590         if (asoc->stream_reset_outstanding == 0) {
3591                 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3592         }
3593         return (0);
3594 }
3595
3596 static void
3597 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3598     struct sctp_tmit_chunk *chk,
3599     struct sctp_stream_reset_in_request *req, int trunc)
3600 {
3601         uint32_t seq;
3602         int len, i;
3603         int number_entries;
3604         uint16_t temp;
3605
3606         /*
3607          * peer wants me to send a str-reset to him for my outgoing seq's if
3608          * seq_in is right.
3609          */
3610         struct sctp_association *asoc = &stcb->asoc;
3611
3612         seq = ntohl(req->request_seq);
3613         if (asoc->str_reset_seq_in == seq) {
3614                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3615                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3616                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3617                 } else if (trunc) {
3618                         /* Can't do it, since they exceeded our buffer size  */
3619                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3620                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3621                         len = ntohs(req->ph.param_length);
3622                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3623                         if (number_entries) {
3624                                 for (i = 0; i < number_entries; i++) {
3625                                         temp = ntohs(req->list_of_streams[i]);
3626                                         if (temp >= stcb->asoc.streamoutcnt) {
3627                                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3628                                                 goto bad_boy;
3629                                         }
3630                                         req->list_of_streams[i] = temp;
3631                                 }
3632                                 for (i = 0; i < number_entries; i++) {
3633                                         if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) {
3634                                                 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING;
3635                                         }
3636                                 }
3637                         } else {
3638                                 /* Its all */
3639                                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3640                                         if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN)
3641                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING;
3642                                 }
3643                         }
3644                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3645                 } else {
3646                         /* Can't do it, since we have sent one out */
3647                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3648                 }
3649 bad_boy:
3650                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3651                 asoc->str_reset_seq_in++;
3652         } else if (asoc->str_reset_seq_in - 1 == seq) {
3653                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3654         } else if (asoc->str_reset_seq_in - 2 == seq) {
3655                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3656         } else {
3657                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3658         }
3659         sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3660 }
3661
3662 static int
3663 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3664     struct sctp_tmit_chunk *chk,
3665     struct sctp_stream_reset_tsn_request *req)
3666 {
3667         /* reset all in and out and update the tsn */
3668         /*
3669          * A) reset my str-seq's on in and out. B) Select a receive next,
3670          * and set cum-ack to it. Also process this selected number as a
3671          * fwd-tsn as well. C) set in the response my next sending seq.
3672          */
3673         struct sctp_forward_tsn_chunk fwdtsn;
3674         struct sctp_association *asoc = &stcb->asoc;
3675         int abort_flag = 0;
3676         uint32_t seq;
3677
3678         seq = ntohl(req->request_seq);
3679         if (asoc->str_reset_seq_in == seq) {
3680                 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3681                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3682                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3683                 } else {
3684                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3685                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3686                         fwdtsn.ch.chunk_flags = 0;
3687                         fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3688                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3689                         if (abort_flag) {
3690                                 return (1);
3691                         }
3692                         asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3693                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3694                                 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3695                         }
3696                         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3697                         asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3698                         memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3699                         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3700                         memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3701                         atomic_add_int(&asoc->sending_seq, 1);
3702                         /* save off historical data for retrans */
3703                         asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3704                         asoc->last_sending_seq[0] = asoc->sending_seq;
3705                         asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3706                         asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3707                         sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3708                         sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3709                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3710                         sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3711                 }
3712                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3713                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3714                 asoc->str_reset_seq_in++;
3715         } else if (asoc->str_reset_seq_in - 1 == seq) {
3716                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3717                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3718         } else if (asoc->str_reset_seq_in - 2 == seq) {
3719                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3720                     asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3721         } else {
3722                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3723         }
3724         return (0);
3725 }
3726
3727 static void
3728 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3729     struct sctp_tmit_chunk *chk,
3730     struct sctp_stream_reset_out_request *req, int trunc)
3731 {
3732         uint32_t seq, tsn;
3733         int number_entries, len;
3734         struct sctp_association *asoc = &stcb->asoc;
3735
3736         seq = ntohl(req->request_seq);
3737
3738         /* now if its not a duplicate we process it */
3739         if (asoc->str_reset_seq_in == seq) {
3740                 len = ntohs(req->ph.param_length);
3741                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3742                 /*
3743                  * the sender is resetting, handle the list issue.. we must
3744                  * a) verify if we can do the reset, if so no problem b) If
3745                  * we can't do the reset we must copy the request. c) queue
3746                  * it, and setup the data in processor to trigger it off
3747                  * when needed and dequeue all the queued data.
3748                  */
3749                 tsn = ntohl(req->send_reset_at_tsn);
3750
3751                 /* move the reset action back one */
3752                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3753                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3754                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3755                 } else if (trunc) {
3756                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3757                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3758                         /* we can do it now */
3759                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3760                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3761                 } else {
3762                         /*
3763                          * we must queue it up and thus wait for the TSN's
3764                          * to arrive that are at or before tsn
3765                          */
3766                         struct sctp_stream_reset_list *liste;
3767                         int siz;
3768
3769                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3770                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3771                             siz, SCTP_M_STRESET);
3772                         if (liste == NULL) {
3773                                 /* gak out of memory */
3774                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3775                                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3776                                 return;
3777                         }
3778                         liste->seq = seq;
3779                         liste->tsn = tsn;
3780                         liste->number_entries = number_entries;
3781                         memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
3782                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3783                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS;
3784                 }
3785                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3786                 asoc->str_reset_seq_in++;
3787         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3788                 /*
3789                  * one seq back, just echo back last action since my
3790                  * response was lost.
3791                  */
3792                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3793         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3794                 /*
3795                  * two seq back, just echo back last action since my
3796                  * response was lost.
3797                  */
3798                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3799         } else {
3800                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3801         }
3802 }
3803
3804 static void
3805 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3806     struct sctp_stream_reset_add_strm *str_add)
3807 {
3808         /*
3809          * Peer is requesting to add more streams. If its within our
3810          * max-streams we will allow it.
3811          */
3812         uint32_t num_stream, i;
3813         uint32_t seq;
3814         struct sctp_association *asoc = &stcb->asoc;
3815         struct sctp_queued_to_read *ctl, *nctl;
3816
3817         /* Get the number. */
3818         seq = ntohl(str_add->request_seq);
3819         num_stream = ntohs(str_add->number_of_streams);
3820         /* Now what would be the new total? */
3821         if (asoc->str_reset_seq_in == seq) {
3822                 num_stream += stcb->asoc.streamincnt;
3823                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3824                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3825                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3826                 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
3827                     (num_stream > 0xffff)) {
3828                         /* We must reject it they ask for to many */
3829         denied:
3830                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3831                 } else {
3832                         /* Ok, we can do that :-) */
3833                         struct sctp_stream_in *oldstrm;
3834
3835                         /* save off the old */
3836                         oldstrm = stcb->asoc.strmin;
3837                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
3838                             (num_stream * sizeof(struct sctp_stream_in)),
3839                             SCTP_M_STRMI);
3840                         if (stcb->asoc.strmin == NULL) {
3841                                 stcb->asoc.strmin = oldstrm;
3842                                 goto denied;
3843                         }
3844                         /* copy off the old data */
3845                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
3846                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3847                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
3848                                 stcb->asoc.strmin[i].sid = i;
3849                                 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered;
3850                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
3851                                 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started;
3852                                 /* now anything on those queues? */
3853                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) {
3854                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm);
3855                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm);
3856                                 }
3857                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) {
3858                                         TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm);
3859                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm);
3860                                 }
3861                         }
3862                         /* Init the new streams */
3863                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
3864                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3865                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
3866                                 stcb->asoc.strmin[i].sid = i;
3867                                 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
3868                                 stcb->asoc.strmin[i].pd_api_started = 0;
3869                                 stcb->asoc.strmin[i].delivery_started = 0;
3870                         }
3871                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
3872                         /* update the size */
3873                         stcb->asoc.streamincnt = num_stream;
3874                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3875                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3876                 }
3877                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3878                 asoc->str_reset_seq_in++;
3879         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3880                 /*
3881                  * one seq back, just echo back last action since my
3882                  * response was lost.
3883                  */
3884                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3885         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3886                 /*
3887                  * two seq back, just echo back last action since my
3888                  * response was lost.
3889                  */
3890                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3891         } else {
3892                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3893         }
3894 }
3895
3896 static void
3897 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3898     struct sctp_stream_reset_add_strm *str_add)
3899 {
3900         /*
3901          * Peer is requesting to add more streams. If its within our
3902          * max-streams we will allow it.
3903          */
3904         uint16_t num_stream;
3905         uint32_t seq;
3906         struct sctp_association *asoc = &stcb->asoc;
3907
3908         /* Get the number. */
3909         seq = ntohl(str_add->request_seq);
3910         num_stream = ntohs(str_add->number_of_streams);
3911         /* Now what would be the new total? */
3912         if (asoc->str_reset_seq_in == seq) {
3913                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3914                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3915                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3916                 } else if (stcb->asoc.stream_reset_outstanding) {
3917                         /* We must reject it we have something pending */
3918                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3919                 } else {
3920                         /* Ok, we can do that :-) */
3921                         int mychk;
3922
3923                         mychk = stcb->asoc.streamoutcnt;
3924                         mychk += num_stream;
3925                         if (mychk < 0x10000) {
3926                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3927                                 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) {
3928                                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3929                                 }
3930                         } else {
3931                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3932                         }
3933                 }
3934                 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
3935                 asoc->str_reset_seq_in++;
3936         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3937                 /*
3938                  * one seq back, just echo back last action since my
3939                  * response was lost.
3940                  */
3941                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3942         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3943                 /*
3944                  * two seq back, just echo back last action since my
3945                  * response was lost.
3946                  */
3947                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3948         } else {
3949                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3950         }
3951 }
3952
3953 #ifdef __GNUC__
3954 __attribute__((noinline))
3955 #endif
3956 static int
3957 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
3958     struct sctp_chunkhdr *ch_req)
3959 {
3960         uint16_t remaining_length, param_len, ptype;
3961         struct sctp_paramhdr pstore;
3962         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
3963         uint32_t seq = 0;
3964         int num_req = 0;
3965         int trunc = 0;
3966         struct sctp_tmit_chunk *chk;
3967         struct sctp_chunkhdr *ch;
3968         struct sctp_paramhdr *ph;
3969         int ret_code = 0;
3970         int num_param = 0;
3971
3972         /* now it may be a reset or a reset-response */
3973         remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
3974
3975         /* setup for adding the response */
3976         sctp_alloc_a_chunk(stcb, chk);
3977         if (chk == NULL) {
3978                 return (ret_code);
3979         }
3980         chk->copy_by_ref = 0;
3981         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
3982         chk->rec.chunk_id.can_take_data = 0;
3983         chk->flags = 0;
3984         chk->asoc = &stcb->asoc;
3985         chk->no_fr_allowed = 0;
3986         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
3987         chk->book_size_scale = 0;
3988         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
3989         if (chk->data == NULL) {
3990 strres_nochunk:
3991                 if (chk->data) {
3992                         sctp_m_freem(chk->data);
3993                         chk->data = NULL;
3994                 }
3995                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3996                 return (ret_code);
3997         }
3998         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
3999
4000         /* setup chunk parameters */
4001         chk->sent = SCTP_DATAGRAM_UNSENT;
4002         chk->snd_count = 0;
4003         chk->whoTo = NULL;
4004
4005         ch = mtod(chk->data, struct sctp_chunkhdr *);
4006         ch->chunk_type = SCTP_STREAM_RESET;
4007         ch->chunk_flags = 0;
4008         ch->chunk_length = htons(chk->send_size);
4009         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4010         offset += sizeof(struct sctp_chunkhdr);
4011         while (remaining_length >= sizeof(struct sctp_paramhdr)) {
4012                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore);
4013                 if (ph == NULL) {
4014                         /* TSNH */
4015                         break;
4016                 }
4017                 param_len = ntohs(ph->param_length);
4018                 if ((param_len > remaining_length) ||
4019                     (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
4020                         /* bad parameter length */
4021                         break;
4022                 }
4023                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
4024                     (uint8_t *)&cstore);
4025                 if (ph == NULL) {
4026                         /* TSNH */
4027                         break;
4028                 }
4029                 ptype = ntohs(ph->param_type);
4030                 num_param++;
4031                 if (param_len > sizeof(cstore)) {
4032                         trunc = 1;
4033                 } else {
4034                         trunc = 0;
4035                 }
4036                 if (num_param > SCTP_MAX_RESET_PARAMS) {
4037                         /* hit the max of parameters already sorry.. */
4038                         break;
4039                 }
4040                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4041                         struct sctp_stream_reset_out_request *req_out;
4042
4043                         if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
4044                                 break;
4045                         }
4046                         req_out = (struct sctp_stream_reset_out_request *)ph;
4047                         num_req++;
4048                         if (stcb->asoc.stream_reset_outstanding) {
4049                                 seq = ntohl(req_out->response_seq);
4050                                 if (seq == stcb->asoc.str_reset_seq_out) {
4051                                         /* implicit ack */
4052                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4053                                 }
4054                         }
4055                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4056                 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4057                         struct sctp_stream_reset_add_strm *str_add;
4058
4059                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4060                                 break;
4061                         }
4062                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4063                         num_req++;
4064                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4065                 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4066                         struct sctp_stream_reset_add_strm *str_add;
4067
4068                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4069                                 break;
4070                         }
4071                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4072                         num_req++;
4073                         sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4074                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4075                         struct sctp_stream_reset_in_request *req_in;
4076
4077                         num_req++;
4078                         req_in = (struct sctp_stream_reset_in_request *)ph;
4079                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4080                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4081                         struct sctp_stream_reset_tsn_request *req_tsn;
4082
4083                         num_req++;
4084                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4085                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4086                                 ret_code = 1;
4087                                 goto strres_nochunk;
4088                         }
4089                         /* no more */
4090                         break;
4091                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4092                         struct sctp_stream_reset_response *resp;
4093                         uint32_t result;
4094
4095                         if (param_len < sizeof(struct sctp_stream_reset_response)) {
4096                                 break;
4097                         }
4098                         resp = (struct sctp_stream_reset_response *)ph;
4099                         seq = ntohl(resp->response_seq);
4100                         result = ntohl(resp->result);
4101                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4102                                 ret_code = 1;
4103                                 goto strres_nochunk;
4104                         }
4105                 } else {
4106                         break;
4107                 }
4108                 offset += SCTP_SIZE32(param_len);
4109                 if (remaining_length >= SCTP_SIZE32(param_len)) {
4110                         remaining_length -= SCTP_SIZE32(param_len);
4111                 } else {
4112                         remaining_length = 0;
4113                 }
4114         }
4115         if (num_req == 0) {
4116                 /* we have no response free the stuff */
4117                 goto strres_nochunk;
4118         }
4119         /* ok we have a chunk to link in */
4120         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4121             chk,
4122             sctp_next);
4123         stcb->asoc.ctrl_queue_cnt++;
4124         return (ret_code);
4125 }
4126
4127 /*
4128  * Handle a router or endpoints report of a packet loss, there are two ways
4129  * to handle this, either we get the whole packet and must disect it
4130  * ourselves (possibly with truncation and or corruption) or it is a summary
4131  * from a middle box that did the disectting for us.
4132  */
4133 static void
4134 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4135     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4136 {
4137         struct sctp_chunk_desc desc;
4138         struct sctp_chunkhdr *chk_hdr;
4139         struct sctp_data_chunk *data_chunk;
4140         struct sctp_idata_chunk *idata_chunk;
4141         uint32_t bottle_bw, on_queue;
4142         uint32_t offset, chk_len;
4143         uint16_t pktdrp_len;
4144         uint8_t pktdrp_flags;
4145
4146         KASSERT(sizeof(struct sctp_pktdrop_chunk) <= limit,
4147             ("PKTDROP chunk too small"));
4148         pktdrp_flags = cp->ch.chunk_flags;
4149         pktdrp_len = ntohs(cp->ch.chunk_length);
4150         KASSERT(limit <= pktdrp_len, ("Inconsistent limit"));
4151         if (pktdrp_flags & SCTP_PACKET_TRUNCATED) {
4152                 if (ntohs(cp->trunc_len) <= pktdrp_len - sizeof(struct sctp_pktdrop_chunk)) {
4153                         /* The peer plays games with us. */
4154                         return;
4155                 }
4156         }
4157         limit -= sizeof(struct sctp_pktdrop_chunk);
4158         offset = 0;
4159         if (offset == limit) {
4160                 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4161                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4162                 }
4163         } else if (offset + sizeof(struct sctphdr) > limit) {
4164                 /* Only a partial SCTP common header. */
4165                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4166                 offset = limit;
4167         } else {
4168                 /* XXX: Check embedded SCTP common header. */
4169                 offset += sizeof(struct sctphdr);
4170         }
4171         /* Now parse through the chunks themselves. */
4172         while (offset < limit) {
4173                 if (offset + sizeof(struct sctp_chunkhdr) > limit) {
4174                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4175                         break;
4176                 }
4177                 chk_hdr = (struct sctp_chunkhdr *)(cp->data + offset);
4178                 desc.chunk_type = chk_hdr->chunk_type;
4179                 /* get amount we need to move */
4180                 chk_len = (uint32_t)ntohs(chk_hdr->chunk_length);
4181                 if (chk_len < sizeof(struct sctp_chunkhdr)) {
4182                         /* Someone is lying... */
4183                         break;
4184                 }
4185                 if (desc.chunk_type == SCTP_DATA) {
4186                         if (stcb->asoc.idata_supported) {
4187                                 /* Some is playing games with us. */
4188                                 break;
4189                         }
4190                         if (chk_len <= sizeof(struct sctp_data_chunk)) {
4191                                 /* Some is playing games with us. */
4192                                 break;
4193                         }
4194                         if (chk_len < sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY) {
4195                                 /*
4196                                  * Not enough data bytes available in the
4197                                  * chunk.
4198                                  */
4199                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4200                                 goto next_chunk;
4201                         }
4202                         if (offset + sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) {
4203                                 /* Not enough data in buffer. */
4204                                 break;
4205                         }
4206                         data_chunk = (struct sctp_data_chunk *)(cp->data + offset);
4207                         memcpy(desc.data_bytes, data_chunk + 1, SCTP_NUM_DB_TO_VERIFY);
4208                         desc.tsn_ifany = data_chunk->dp.tsn;
4209                         if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4210                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4211                         }
4212                 } else if (desc.chunk_type == SCTP_IDATA) {
4213                         if (!stcb->asoc.idata_supported) {
4214                                 /* Some is playing games with us. */
4215                                 break;
4216                         }
4217                         if (chk_len <= sizeof(struct sctp_idata_chunk)) {
4218                                 /* Some is playing games with us. */
4219                                 break;
4220                         }
4221                         if (chk_len < sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY) {
4222                                 /*
4223                                  * Not enough data bytes available in the
4224                                  * chunk.
4225                                  */
4226                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4227                                 goto next_chunk;
4228                         }
4229                         if (offset + sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) {
4230                                 /* Not enough data in buffer. */
4231                                 break;
4232                         }
4233                         idata_chunk = (struct sctp_idata_chunk *)(cp->data + offset);
4234                         memcpy(desc.data_bytes, idata_chunk + 1, SCTP_NUM_DB_TO_VERIFY);
4235                         desc.tsn_ifany = idata_chunk->dp.tsn;
4236                         if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4237                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4238                         }
4239                 } else {
4240                         if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4241                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4242                         }
4243                 }
4244                 if (process_chunk_drop(stcb, &desc, net, pktdrp_flags)) {
4245                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4246                         break;
4247                 }
4248 next_chunk:
4249                 offset += SCTP_SIZE32(chk_len);
4250         }
4251         /* Now update any rwnd --- possibly */
4252         if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4253                 /* From a peer, we get a rwnd report */
4254                 uint32_t a_rwnd;
4255
4256                 SCTP_STAT_INCR(sctps_pdrpfehos);
4257
4258                 bottle_bw = ntohl(cp->bottle_bw);
4259                 on_queue = ntohl(cp->current_onq);
4260                 if (bottle_bw && on_queue) {
4261                         /* a rwnd report is in here */
4262                         if (bottle_bw > on_queue)
4263                                 a_rwnd = bottle_bw - on_queue;
4264                         else
4265                                 a_rwnd = 0;
4266
4267                         if (a_rwnd == 0)
4268                                 stcb->asoc.peers_rwnd = 0;
4269                         else {
4270                                 if (a_rwnd > stcb->asoc.total_flight) {
4271                                         stcb->asoc.peers_rwnd =
4272                                             a_rwnd - stcb->asoc.total_flight;
4273                                 } else {
4274                                         stcb->asoc.peers_rwnd = 0;
4275                                 }
4276                                 if (stcb->asoc.peers_rwnd <
4277                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4278                                         /* SWS sender side engages */
4279                                         stcb->asoc.peers_rwnd = 0;
4280                                 }
4281                         }
4282                 }
4283         } else {
4284                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4285         }
4286
4287         /* now middle boxes in sat networks get a cwnd bump */
4288         if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) &&
4289             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4290             (stcb->asoc.sat_network)) {
4291                 /*
4292                  * This is debatable but for sat networks it makes sense
4293                  * Note if a T3 timer has went off, we will prohibit any
4294                  * changes to cwnd until we exit the t3 loss recovery.
4295                  */
4296                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4297                     net, cp, &bottle_bw, &on_queue);
4298         }
4299 }
4300
4301 /*
4302  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4303  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4304  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4305  * length of the complete packet outputs: - length: modified to remaining
4306  * length after control processing - netp: modified to new sctp_nets after
4307  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4308  * bad packet,...) otherwise return the tcb for this packet
4309  */
4310 #ifdef __GNUC__
4311 __attribute__((noinline))
4312 #endif
4313 static struct sctp_tcb *
4314 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4315     struct sockaddr *src, struct sockaddr *dst,
4316     struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4317     struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4318     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
4319     uint32_t vrf_id, uint16_t port)
4320 {
4321         struct sctp_association *asoc;
4322         struct mbuf *op_err;
4323         char msg[SCTP_DIAG_INFO_LEN];
4324         uint32_t vtag_in;
4325         int num_chunks = 0;     /* number of control chunks processed */
4326         uint32_t chk_length, contiguous;
4327         int ret;
4328         int abort_no_unlock = 0;
4329         int ecne_seen = 0;
4330         int abort_flag;
4331
4332         /*
4333          * How big should this be, and should it be alloc'd? Lets try the
4334          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4335          * until we get into jumbo grams and such..
4336          */
4337         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4338         int got_auth = 0;
4339         uint32_t auth_offset = 0, auth_len = 0;
4340         int auth_skipped = 0;
4341         int asconf_cnt = 0;
4342
4343         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4344             iphlen, *offset, length, (void *)stcb);
4345
4346         if (stcb) {
4347                 SCTP_TCB_LOCK_ASSERT(stcb);
4348         }
4349         /* validate chunk header length... */
4350         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4351                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4352                     ntohs(ch->chunk_length));
4353                 *offset = length;
4354                 return (stcb);
4355         }
4356         /*
4357          * validate the verification tag
4358          */
4359         vtag_in = ntohl(sh->v_tag);
4360
4361         if (ch->chunk_type == SCTP_INITIATION) {
4362                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4363                     ntohs(ch->chunk_length), vtag_in);
4364                 if (vtag_in != 0) {
4365                         /* protocol error- silently discard... */
4366                         SCTP_STAT_INCR(sctps_badvtag);
4367                         if (stcb != NULL) {
4368                                 SCTP_TCB_UNLOCK(stcb);
4369                         }
4370                         return (NULL);
4371                 }
4372         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4373                 /*
4374                  * If there is no stcb, skip the AUTH chunk and process
4375                  * later after a stcb is found (to validate the lookup was
4376                  * valid.
4377                  */
4378                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4379                     (stcb == NULL) &&
4380                     (inp->auth_supported == 1)) {
4381                         /* save this chunk for later processing */
4382                         auth_skipped = 1;
4383                         auth_offset = *offset;
4384                         auth_len = ntohs(ch->chunk_length);
4385
4386                         /* (temporarily) move past this chunk */
4387                         *offset += SCTP_SIZE32(auth_len);
4388                         if (*offset >= length) {
4389                                 /* no more data left in the mbuf chain */
4390                                 *offset = length;
4391                                 return (NULL);
4392                         }
4393                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4394                             sizeof(struct sctp_chunkhdr), chunk_buf);
4395                 }
4396                 if (ch == NULL) {
4397                         /* Help */
4398                         *offset = length;
4399                         return (stcb);
4400                 }
4401                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4402                         goto process_control_chunks;
4403                 }
4404                 /*
4405                  * first check if it's an ASCONF with an unknown src addr we
4406                  * need to look inside to find the association
4407                  */
4408                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4409                         struct sctp_chunkhdr *asconf_ch = ch;
4410                         uint32_t asconf_offset = 0, asconf_len = 0;
4411
4412                         /* inp's refcount may be reduced */
4413                         SCTP_INP_INCR_REF(inp);
4414
4415                         asconf_offset = *offset;
4416                         do {
4417                                 asconf_len = ntohs(asconf_ch->chunk_length);
4418                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4419                                         break;
4420                                 stcb = sctp_findassociation_ep_asconf(m,
4421                                     *offset,
4422                                     dst,
4423                                     sh, &inp, netp, vrf_id);
4424                                 if (stcb != NULL)
4425                                         break;
4426                                 asconf_offset += SCTP_SIZE32(asconf_len);
4427                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4428                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4429                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4430                         if (stcb == NULL) {
4431                                 /*
4432                                  * reduce inp's refcount if not reduced in
4433                                  * sctp_findassociation_ep_asconf().
4434                                  */
4435                                 SCTP_INP_DECR_REF(inp);
4436                         }
4437
4438                         /* now go back and verify any auth chunk to be sure */
4439                         if (auth_skipped && (stcb != NULL)) {
4440                                 struct sctp_auth_chunk *auth;
4441
4442                                 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) {
4443                                         auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, chunk_buf);
4444                                         got_auth = 1;
4445                                         auth_skipped = 0;
4446                                 } else {
4447                                         auth = NULL;
4448                                 }
4449                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4450                                     auth_offset)) {
4451                                         /* auth HMAC failed so dump it */
4452                                         *offset = length;
4453                                         return (stcb);
4454                                 } else {
4455                                         /* remaining chunks are HMAC checked */
4456                                         stcb->asoc.authenticated = 1;
4457                                 }
4458                         }
4459                 }
4460                 if (stcb == NULL) {
4461                         SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4462                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4463                             msg);
4464                         /* no association, so it's out of the blue... */
4465                         sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
4466                             mflowtype, mflowid, inp->fibnum,
4467                             vrf_id, port);
4468                         *offset = length;
4469                         return (NULL);
4470                 }
4471                 asoc = &stcb->asoc;
4472                 /* ABORT and SHUTDOWN can use either v_tag... */
4473                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4474                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4475                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4476                         /* Take the T-bit always into account. */
4477                         if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
4478                             (vtag_in == asoc->my_vtag)) ||
4479                             (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
4480                             (asoc->peer_vtag != htonl(0)) &&
4481                             (vtag_in == asoc->peer_vtag))) {
4482                                 /* this is valid */
4483                         } else {
4484                                 /* drop this packet... */
4485                                 SCTP_STAT_INCR(sctps_badvtag);
4486                                 if (stcb != NULL) {
4487                                         SCTP_TCB_UNLOCK(stcb);
4488                                 }
4489                                 return (NULL);
4490                         }
4491                 } else {
4492                         /* for all other chunks, vtag must match */
4493                         if (vtag_in != asoc->my_vtag) {
4494                                 /* invalid vtag... */
4495                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4496                                     "invalid vtag: %xh, expect %xh\n",
4497                                     vtag_in, asoc->my_vtag);
4498                                 SCTP_STAT_INCR(sctps_badvtag);
4499                                 if (stcb != NULL) {
4500                                         SCTP_TCB_UNLOCK(stcb);
4501                                 }
4502                                 *offset = length;
4503                                 return (NULL);
4504                         }
4505                 }
4506         }                       /* end if !SCTP_COOKIE_ECHO */
4507         /*
4508          * process all control chunks...
4509          */
4510         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4511             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4512             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4513             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
4514                 /* implied cookie-ack.. we must have lost the ack */
4515                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4516                     *netp);
4517         }
4518
4519 process_control_chunks:
4520         while (IS_SCTP_CONTROL(ch)) {
4521                 /* validate chunk length */
4522                 chk_length = ntohs(ch->chunk_length);
4523                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4524                     ch->chunk_type, chk_length);
4525                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4526                 if (chk_length < sizeof(*ch) ||
4527                     (*offset + (int)chk_length) > length) {
4528                         *offset = length;
4529                         return (stcb);
4530                 }
4531                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4532                 /*
4533                  * INIT and INIT-ACK only gets the init ack "header" portion
4534                  * only because we don't have to process the peer's COOKIE.
4535                  * All others get a complete chunk.
4536                  */
4537                 switch (ch->chunk_type) {
4538                 case SCTP_INITIATION:
4539                         contiguous = sizeof(struct sctp_init_chunk);
4540                         break;
4541                 case SCTP_INITIATION_ACK:
4542                         contiguous = sizeof(struct sctp_init_ack_chunk);
4543                         break;
4544                 default:
4545                         contiguous = min(chk_length, sizeof(chunk_buf));
4546                         break;
4547                 }
4548                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4549                     contiguous,
4550                     chunk_buf);
4551                 if (ch == NULL) {
4552                         *offset = length;
4553                         return (stcb);
4554                 }
4555
4556                 num_chunks++;
4557                 /* Save off the last place we got a control from */
4558                 if (stcb != NULL) {
4559                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4560                                 /*
4561                                  * allow last_control to be NULL if
4562                                  * ASCONF... ASCONF processing will find the
4563                                  * right net later
4564                                  */
4565                                 if ((netp != NULL) && (*netp != NULL))
4566                                         stcb->asoc.last_control_chunk_from = *netp;
4567                         }
4568                 }
4569 #ifdef SCTP_AUDITING_ENABLED
4570                 sctp_audit_log(0xB0, ch->chunk_type);
4571 #endif
4572
4573                 /* check to see if this chunk required auth, but isn't */
4574                 if ((stcb != NULL) &&
4575                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4576                     !stcb->asoc.authenticated) {
4577                         /* "silently" ignore */
4578                         SCTP_STAT_INCR(sctps_recvauthmissing);
4579                         goto next_chunk;
4580                 }
4581                 switch (ch->chunk_type) {
4582                 case SCTP_INITIATION:
4583                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4584                         /* The INIT chunk must be the only chunk. */
4585                         if ((num_chunks > 1) ||
4586                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4587                                 /*
4588                                  * RFC 4960bis requires stopping the
4589                                  * processing of the packet.
4590                                  */
4591                                 *offset = length;
4592                                 return (stcb);
4593                         }
4594                         /* Honor our resource limit. */
4595                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4596                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4597                                 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
4598                                     mflowtype, mflowid, inp->fibnum,
4599                                     vrf_id, port);
4600                                 *offset = length;
4601                                 if (stcb != NULL) {
4602                                         SCTP_TCB_UNLOCK(stcb);
4603                                 }
4604                                 return (NULL);
4605                         }
4606                         sctp_handle_init(m, iphlen, *offset, src, dst, sh,
4607                             (struct sctp_init_chunk *)ch, inp,
4608                             stcb, *netp,
4609                             mflowtype, mflowid,
4610                             vrf_id, port);
4611                         *offset = length;
4612                         if (stcb != NULL) {
4613                                 SCTP_TCB_UNLOCK(stcb);
4614                         }
4615                         return (NULL);
4616                         break;
4617                 case SCTP_PAD_CHUNK:
4618                         break;
4619                 case SCTP_INITIATION_ACK:
4620                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n");
4621                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4622                                 /* We are not interested anymore */
4623                                 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) {
4624                                         ;
4625                                 } else {
4626                                         *offset = length;
4627                                         if (stcb != NULL) {
4628                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
4629                                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
4630                                         }
4631                                         return (NULL);
4632                                 }
4633                         }
4634                         /* The INIT-ACK chunk must be the only chunk. */
4635                         if ((num_chunks > 1) ||
4636                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4637                                 *offset = length;
4638                                 return (stcb);
4639                         }
4640                         if ((netp != NULL) && (*netp != NULL)) {
4641                                 ret = sctp_handle_init_ack(m, iphlen, *offset,
4642                                     src, dst, sh,
4643                                     (struct sctp_init_ack_chunk *)ch,
4644                                     stcb, *netp,
4645                                     &abort_no_unlock,
4646                                     mflowtype, mflowid,
4647                                     vrf_id);
4648                         } else {
4649                                 ret = -1;
4650                         }
4651                         *offset = length;
4652                         if (abort_no_unlock) {
4653                                 return (NULL);
4654                         }
4655                         /*
4656                          * Special case, I must call the output routine to
4657                          * get the cookie echoed
4658                          */
4659                         if ((stcb != NULL) && (ret == 0)) {
4660                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4661                         }
4662                         return (stcb);
4663                         break;
4664                 case SCTP_SELECTIVE_ACK:
4665                 case SCTP_NR_SELECTIVE_ACK:
4666                         {
4667                                 int abort_now = 0;
4668                                 uint32_t a_rwnd, cum_ack;
4669                                 uint16_t num_seg, num_nr_seg, num_dup;
4670                                 uint8_t flags;
4671                                 int offset_seg, offset_dup;
4672
4673                                 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n",
4674                                     ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK");
4675                                 SCTP_STAT_INCR(sctps_recvsacks);
4676                                 if (stcb == NULL) {
4677                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n",
4678                                             (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK");
4679                                         break;
4680                                 }
4681                                 if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
4682                                         if (chk_length < sizeof(struct sctp_sack_chunk)) {
4683                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4684                                                 break;
4685                                         }
4686                                 } else {
4687                                         if (stcb->asoc.nrsack_supported == 0) {
4688                                                 goto unknown_chunk;
4689                                         }
4690                                         if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
4691                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n");
4692                                                 break;
4693                                         }
4694                                 }
4695                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4696                                         /*-
4697                                          * If we have sent a shutdown-ack, we will pay no
4698                                          * attention to a sack sent in to us since
4699                                          * we don't care anymore.
4700                                          */
4701                                         break;
4702                                 }
4703                                 flags = ch->chunk_flags;
4704                                 if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
4705                                         struct sctp_sack_chunk *sack;
4706
4707                                         sack = (struct sctp_sack_chunk *)ch;
4708                                         cum_ack = ntohl(sack->sack.cum_tsn_ack);
4709                                         num_seg = ntohs(sack->sack.num_gap_ack_blks);
4710                                         num_nr_seg = 0;
4711                                         num_dup = ntohs(sack->sack.num_dup_tsns);
4712                                         a_rwnd = ntohl(sack->sack.a_rwnd);
4713                                         if (sizeof(struct sctp_sack_chunk) +
4714                                             num_seg * sizeof(struct sctp_gap_ack_block) +
4715                                             num_dup * sizeof(uint32_t) != chk_length) {
4716                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4717                                                 break;
4718                                         }
4719                                         offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4720                                         offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4721                                 } else {
4722                                         struct sctp_nr_sack_chunk *nr_sack;
4723
4724                                         nr_sack = (struct sctp_nr_sack_chunk *)ch;
4725                                         cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
4726                                         num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
4727                                         num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
4728                                         num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
4729                                         a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd);
4730                                         if (sizeof(struct sctp_nr_sack_chunk) +
4731                                             (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
4732                                             num_dup * sizeof(uint32_t) != chk_length) {
4733                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
4734                                                 break;
4735                                         }
4736                                         offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
4737                                         offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block);
4738                                 }
4739                                 SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4740                                     (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK",
4741                                     cum_ack, num_seg, a_rwnd);
4742                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4743                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4744                                     (num_seg == 0) && (num_nr_seg == 0) &&
4745                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4746                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4747                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4748                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
4749                                         /*
4750                                          * We have a SIMPLE sack having no
4751                                          * prior segments and data on sent
4752                                          * queue to be acked. Use the faster
4753                                          * path sack processing. We also
4754                                          * allow window update sacks with no
4755                                          * missing segments to go this way
4756                                          * too.
4757                                          */
4758                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
4759                                             &abort_now, ecne_seen);
4760                                 } else {
4761                                         if ((netp != NULL) && (*netp != NULL)) {
4762                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4763                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
4764                                                     cum_ack, a_rwnd, ecne_seen);
4765                                         }
4766                                 }
4767                                 if (abort_now) {
4768                                         /* ABORT signal from sack processing */
4769                                         *offset = length;
4770                                         return (NULL);
4771                                 }
4772                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4773                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4774                                     (stcb->asoc.stream_queue_cnt == 0)) {
4775                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4776                                 }
4777                                 break;
4778                         }
4779                 case SCTP_HEARTBEAT_REQUEST:
4780                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
4781                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
4782                                 SCTP_STAT_INCR(sctps_recvheartbeat);
4783                                 sctp_send_heartbeat_ack(stcb, m, *offset,
4784                                     chk_length, *netp);
4785                         }
4786                         break;
4787                 case SCTP_HEARTBEAT_ACK:
4788                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n");
4789                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
4790                                 /* Its not ours */
4791                                 break;
4792                         }
4793                         SCTP_STAT_INCR(sctps_recvheartbeatack);
4794                         if ((netp != NULL) && (*netp != NULL)) {
4795                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
4796                                     stcb, *netp);
4797                         }
4798                         break;
4799                 case SCTP_ABORT_ASSOCIATION:
4800                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
4801                             (void *)stcb);
4802                         *offset = length;
4803                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
4804                                 if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) {
4805                                         return (NULL);
4806                                 } else {
4807                                         return (stcb);
4808                                 }
4809                         } else {
4810                                 return (NULL);
4811                         }
4812                         break;
4813                 case SCTP_SHUTDOWN:
4814                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
4815                             (void *)stcb);
4816                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
4817                                 break;
4818                         }
4819                         if ((netp != NULL) && (*netp != NULL)) {
4820                                 abort_flag = 0;
4821                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
4822                                     stcb, *netp, &abort_flag);
4823                                 if (abort_flag) {
4824                                         *offset = length;
4825                                         return (NULL);
4826                                 }
4827                         }
4828                         break;
4829                 case SCTP_SHUTDOWN_ACK:
4830                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb);
4831                         if ((chk_length == sizeof(struct sctp_shutdown_ack_chunk)) &&
4832                             (stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
4833                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
4834                                 *offset = length;
4835                                 return (NULL);
4836                         }
4837                         break;
4838                 case SCTP_OPERATION_ERROR:
4839                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n");
4840                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) &&
4841                             sctp_handle_error(ch, stcb, *netp, contiguous) < 0) {
4842                                 *offset = length;
4843                                 return (NULL);
4844                         }
4845                         break;
4846                 case SCTP_COOKIE_ECHO:
4847                         SCTPDBG(SCTP_DEBUG_INPUT3,
4848                             "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb);
4849                         if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) {
4850                                 ;
4851                         } else {
4852                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4853                                         /* We are not interested anymore */
4854                         abend:
4855                                         if (stcb != NULL) {
4856                                                 SCTP_TCB_UNLOCK(stcb);
4857                                         }
4858                                         *offset = length;
4859                                         return (NULL);
4860                                 }
4861                         }
4862                         /*-
4863                          * First are we accepting? We do this again here
4864                          * since it is possible that a previous endpoint WAS
4865                          * listening responded to a INIT-ACK and then
4866                          * closed. We opened and bound.. and are now no
4867                          * longer listening.
4868                          *
4869                          * XXXGL: notes on checking listen queue length.
4870                          * 1) SCTP_IS_LISTENING() doesn't necessarily mean
4871                          *    SOLISTENING(), because a listening "UDP type"
4872                          *    socket isn't listening in terms of the socket
4873                          *    layer.  It is a normal data flow socket, that
4874                          *    can fork off new connections.  Thus, we should
4875                          *    look into sol_qlen only in case we are !UDP.
4876                          * 2) Checking sol_qlen in general requires locking
4877                          *    the socket, and this code lacks that.
4878                          */
4879                         if ((stcb == NULL) &&
4880                             (!SCTP_IS_LISTENING(inp) ||
4881                             (!(inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) &&
4882                             inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) {
4883                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
4884                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
4885                                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4886                                         sctp_abort_association(inp, stcb, m, iphlen,
4887                                             src, dst, sh, op_err,
4888                                             mflowtype, mflowid,
4889                                             vrf_id, port);
4890                                 }
4891                                 *offset = length;
4892                                 return (NULL);
4893                         } else {
4894                                 struct mbuf *ret_buf;
4895                                 struct sctp_inpcb *linp;
4896                                 struct sctp_tmit_chunk *chk;
4897
4898                                 if (inp->sctp_flags & (SCTP_PCB_FLAGS_SOCKET_GONE |
4899                                     SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
4900                                         goto abend;
4901                                 }
4902
4903                                 if (stcb) {
4904                                         linp = NULL;
4905                                 } else {
4906                                         linp = inp;
4907                                 }
4908
4909                                 if (linp != NULL) {
4910                                         SCTP_ASOC_CREATE_LOCK(linp);
4911                                 }
4912
4913                                 if (netp != NULL) {
4914                                         struct sctp_tcb *locked_stcb;
4915
4916                                         locked_stcb = stcb;
4917                                         ret_buf =
4918                                             sctp_handle_cookie_echo(m, iphlen,
4919                                             *offset,
4920                                             src, dst,
4921                                             sh,
4922                                             (struct sctp_cookie_echo_chunk *)ch,
4923                                             &inp, &stcb, netp,
4924                                             auth_skipped,
4925                                             auth_offset,
4926                                             auth_len,
4927                                             &locked_stcb,
4928                                             mflowtype,
4929                                             mflowid,
4930                                             vrf_id,
4931                                             port);
4932                                         if ((locked_stcb != NULL) && (locked_stcb != stcb)) {
4933                                                 SCTP_TCB_UNLOCK(locked_stcb);
4934                                         }
4935                                         if (stcb != NULL) {
4936                                                 SCTP_TCB_LOCK_ASSERT(stcb);
4937                                         }
4938                                 } else {
4939                                         ret_buf = NULL;
4940                                 }
4941                                 if (linp != NULL) {
4942                                         SCTP_ASOC_CREATE_UNLOCK(linp);
4943                                 }
4944                                 if (ret_buf == NULL) {
4945                                         if (stcb != NULL) {
4946                                                 SCTP_TCB_UNLOCK(stcb);
4947                                         }
4948                                         SCTPDBG(SCTP_DEBUG_INPUT3,
4949                                             "GAK, null buffer\n");
4950                                         *offset = length;
4951                                         return (NULL);
4952                                 }
4953                                 /* if AUTH skipped, see if it verified... */
4954                                 if (auth_skipped) {
4955                                         got_auth = 1;
4956                                         auth_skipped = 0;
4957                                 }
4958                                 /* Restart the timer if we have pending data */
4959                                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
4960                                         if (chk->whoTo != NULL) {
4961                                                 break;
4962                                         }
4963                                 }
4964                                 if (chk != NULL) {
4965                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
4966                                 }
4967                         }
4968                         break;
4969                 case SCTP_COOKIE_ACK:
4970                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb);
4971                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
4972                                 break;
4973                         }
4974                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4975                                 /* We are not interested anymore */
4976                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4977                                         ;
4978                                 } else if (stcb) {
4979                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
4980                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
4981                                         *offset = length;
4982                                         return (NULL);
4983                                 }
4984                         }
4985                         if ((netp != NULL) && (*netp != NULL)) {
4986                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
4987                         }
4988                         break;
4989                 case SCTP_ECN_ECHO:
4990                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n");
4991                         if (stcb == NULL) {
4992                                 break;
4993                         }
4994                         if (stcb->asoc.ecn_supported == 0) {
4995                                 goto unknown_chunk;
4996                         }
4997                         if ((chk_length != sizeof(struct sctp_ecne_chunk)) &&
4998                             (chk_length != sizeof(struct old_sctp_ecne_chunk))) {
4999                                 break;
5000                         }
5001                         sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb);
5002                         ecne_seen = 1;
5003                         break;
5004                 case SCTP_ECN_CWR:
5005                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n");
5006                         if (stcb == NULL) {
5007                                 break;
5008                         }
5009                         if (stcb->asoc.ecn_supported == 0) {
5010                                 goto unknown_chunk;
5011                         }
5012                         if (chk_length != sizeof(struct sctp_cwr_chunk)) {
5013                                 break;
5014                         }
5015                         sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5016                         break;
5017                 case SCTP_SHUTDOWN_COMPLETE:
5018                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb);
5019                         /* must be first and only chunk */
5020                         if ((num_chunks > 1) ||
5021                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5022                                 *offset = length;
5023                                 return (stcb);
5024                         }
5025                         if ((chk_length == sizeof(struct sctp_shutdown_complete_chunk)) &&
5026                             (stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5027                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5028                                     stcb, *netp);
5029                                 *offset = length;
5030                                 return (NULL);
5031                         }
5032                         break;
5033                 case SCTP_ASCONF:
5034                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5035                         if (stcb != NULL) {
5036                                 if (stcb->asoc.asconf_supported == 0) {
5037                                         goto unknown_chunk;
5038                                 }
5039                                 sctp_handle_asconf(m, *offset, src,
5040                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5041                                 asconf_cnt++;
5042                         }
5043                         break;
5044                 case SCTP_ASCONF_ACK:
5045                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n");
5046                         if (stcb == NULL) {
5047                                 break;
5048                         }
5049                         if (stcb->asoc.asconf_supported == 0) {
5050                                 goto unknown_chunk;
5051                         }
5052                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5053                                 break;
5054                         }
5055                         if ((netp != NULL) && (*netp != NULL)) {
5056                                 /* He's alive so give him credit */
5057                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5058                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5059                                             stcb->asoc.overall_error_count,
5060                                             0,
5061                                             SCTP_FROM_SCTP_INPUT,
5062                                             __LINE__);
5063                                 }
5064                                 stcb->asoc.overall_error_count = 0;
5065                                 sctp_handle_asconf_ack(m, *offset,
5066                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5067                                 if (abort_no_unlock)
5068                                         return (NULL);
5069                         }
5070                         break;
5071                 case SCTP_FORWARD_CUM_TSN:
5072                 case SCTP_IFORWARD_CUM_TSN:
5073                         SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n",
5074                             ch->chunk_type == SCTP_FORWARD_CUM_TSN ? "FORWARD_TSN" : "I_FORWARD_TSN");
5075                         if (stcb == NULL) {
5076                                 break;
5077                         }
5078                         if (stcb->asoc.prsctp_supported == 0) {
5079                                 goto unknown_chunk;
5080                         }
5081                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5082                                 break;
5083                         }
5084                         if (((stcb->asoc.idata_supported == 1) && (ch->chunk_type == SCTP_FORWARD_CUM_TSN)) ||
5085                             ((stcb->asoc.idata_supported == 0) && (ch->chunk_type == SCTP_IFORWARD_CUM_TSN))) {
5086                                 if (ch->chunk_type == SCTP_FORWARD_CUM_TSN) {
5087                                         SCTP_SNPRINTF(msg, sizeof(msg), "%s", "FORWARD-TSN chunk received when I-FORWARD-TSN was negotiated");
5088                                 } else {
5089                                         SCTP_SNPRINTF(msg, sizeof(msg), "%s", "I-FORWARD-TSN chunk received when FORWARD-TSN was negotiated");
5090                                 }
5091                                 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
5092                                 sctp_abort_an_association(inp, stcb, op_err, false, SCTP_SO_NOT_LOCKED);
5093                                 *offset = length;
5094                                 return (NULL);
5095                         }
5096                         *fwd_tsn_seen = 1;
5097                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5098                                 /* We are not interested anymore */
5099                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5100                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_31);
5101                                 *offset = length;
5102                                 return (NULL);
5103                         }
5104                         /*
5105                          * For sending a SACK this looks like DATA chunks.
5106                          */
5107                         stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from;
5108                         abort_flag = 0;
5109                         sctp_handle_forward_tsn(stcb,
5110                             (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5111                         if (abort_flag) {
5112                                 *offset = length;
5113                                 return (NULL);
5114                         }
5115                         break;
5116                 case SCTP_STREAM_RESET:
5117                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5118                         if (stcb == NULL) {
5119                                 break;
5120                         }
5121                         if (stcb->asoc.reconfig_supported == 0) {
5122                                 goto unknown_chunk;
5123                         }
5124                         if (chk_length < sizeof(struct sctp_stream_reset_tsn_req)) {
5125                                 break;
5126                         }
5127                         if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5128                                 /* stop processing */
5129                                 *offset = length;
5130                                 return (NULL);
5131                         }
5132                         break;
5133                 case SCTP_PACKET_DROPPED:
5134                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5135                         if (stcb == NULL) {
5136                                 break;
5137                         }
5138                         if (stcb->asoc.pktdrop_supported == 0) {
5139                                 goto unknown_chunk;
5140                         }
5141                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5142                                 break;
5143                         }
5144                         if ((netp != NULL) && (*netp != NULL)) {
5145                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5146                                     stcb, *netp,
5147                                     min(chk_length, contiguous));
5148                         }
5149                         break;
5150                 case SCTP_AUTHENTICATION:
5151                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5152                         if (stcb == NULL) {
5153                                 /* save the first AUTH for later processing */
5154                                 if (auth_skipped == 0) {
5155                                         auth_offset = *offset;
5156                                         auth_len = chk_length;
5157                                         auth_skipped = 1;
5158                                 }
5159                                 /* skip this chunk (temporarily) */
5160                                 break;
5161                         }
5162                         if (stcb->asoc.auth_supported == 0) {
5163                                 goto unknown_chunk;
5164                         }
5165                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5166                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5167                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5168                                 /* Its not ours */
5169                                 *offset = length;
5170                                 return (stcb);
5171                         }
5172                         if (got_auth == 1) {
5173                                 /* skip this chunk... it's already auth'd */
5174                                 break;
5175                         }
5176                         got_auth = 1;
5177                         if (sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, m, *offset)) {
5178                                 /* auth HMAC failed so dump the packet */
5179                                 *offset = length;
5180                                 return (stcb);
5181                         } else {
5182                                 /* remaining chunks are HMAC checked */
5183                                 stcb->asoc.authenticated = 1;
5184                         }
5185                         break;
5186
5187                 default:
5188         unknown_chunk:
5189                         /* it's an unknown chunk! */
5190                         if ((ch->chunk_type & 0x40) &&
5191                             (stcb != NULL) &&
5192                             (SCTP_GET_STATE(stcb) != SCTP_STATE_EMPTY) &&
5193                             (SCTP_GET_STATE(stcb) != SCTP_STATE_INUSE) &&
5194                             (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) {
5195                                 struct sctp_gen_error_cause *cause;
5196                                 int len;
5197
5198                                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause),
5199                                     0, M_NOWAIT, 1, MT_DATA);
5200                                 if (op_err != NULL) {
5201                                         len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset));
5202                                         cause = mtod(op_err, struct sctp_gen_error_cause *);
5203                                         cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5204                                         cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause)));
5205                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5206                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
5207                                         if (SCTP_BUF_NEXT(op_err) != NULL) {
5208 #ifdef SCTP_MBUF_LOGGING
5209                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5210                                                         sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY);
5211                                                 }
5212 #endif
5213                                                 sctp_queue_op_err(stcb, op_err);
5214                                         } else {
5215                                                 sctp_m_freem(op_err);
5216                                         }
5217                                 }
5218                         }
5219                         if ((ch->chunk_type & 0x80) == 0) {
5220                                 /* discard this packet */
5221                                 *offset = length;
5222                                 return (stcb);
5223                         }       /* else skip this bad chunk and continue... */
5224                         break;
5225                 }               /* switch (ch->chunk_type) */
5226
5227 next_chunk:
5228                 /* get the next chunk */
5229                 *offset += SCTP_SIZE32(chk_length);
5230                 if (*offset >= length) {
5231                         /* no more data left in the mbuf chain */
5232                         break;
5233                 }
5234                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5235                     sizeof(struct sctp_chunkhdr), chunk_buf);
5236                 if (ch == NULL) {
5237                         *offset = length;
5238                         return (stcb);
5239                 }
5240         }                       /* while */
5241
5242         if ((asconf_cnt > 0) && (stcb != NULL)) {
5243                 sctp_send_asconf_ack(stcb);
5244         }
5245         return (stcb);
5246 }
5247
5248 /*
5249  * common input chunk processing (v4 and v6)
5250  */
5251 void
5252 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5253     struct sockaddr *src, struct sockaddr *dst,
5254     struct sctphdr *sh, struct sctp_chunkhdr *ch,
5255     uint8_t compute_crc,
5256     uint8_t ecn_bits,
5257     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
5258     uint32_t vrf_id, uint16_t port)
5259 {
5260         uint32_t high_tsn;
5261         int fwd_tsn_seen = 0, data_processed = 0;
5262         struct mbuf *m = *mm, *op_err;
5263         char msg[SCTP_DIAG_INFO_LEN];
5264         int un_sent;
5265         int cnt_ctrl_ready = 0;
5266         struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5267         struct sctp_tcb *stcb = NULL;
5268         struct sctp_nets *net = NULL;
5269
5270         SCTP_STAT_INCR(sctps_recvdatagrams);
5271 #ifdef SCTP_AUDITING_ENABLED
5272         sctp_audit_log(0xE0, 1);
5273         sctp_auditing(0, inp, stcb, net);
5274 #endif
5275         if (compute_crc != 0) {
5276                 uint32_t check, calc_check;
5277
5278                 check = sh->checksum;
5279                 sh->checksum = 0;
5280                 calc_check = sctp_calculate_cksum(m, iphlen);
5281                 sh->checksum = check;
5282                 if (calc_check != check) {
5283                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5284                             calc_check, check, (void *)m, length, iphlen);
5285                         stcb = sctp_findassociation_addr(m, offset, src, dst,
5286                             sh, ch, &inp, &net, vrf_id);
5287 #if defined(INET) || defined(INET6)
5288                         if ((ch->chunk_type != SCTP_INITIATION) &&
5289                             (net != NULL) && (net->port != port)) {
5290                                 if (net->port == 0) {
5291                                         /* UDP encapsulation turned on. */
5292                                         net->mtu -= sizeof(struct udphdr);
5293                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5294                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5295                                         }
5296                                 } else if (port == 0) {
5297                                         /* UDP encapsulation turned off. */
5298                                         net->mtu += sizeof(struct udphdr);
5299                                         /* XXX Update smallest_mtu */
5300                                 }
5301                                 net->port = port;
5302                         }
5303 #endif
5304                         if (net != NULL) {
5305                                 net->flowtype = mflowtype;
5306                                 net->flowid = mflowid;
5307                         }
5308                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5309                         if ((inp != NULL) && (stcb != NULL)) {
5310                                 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5311                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5312                         } else if ((inp != NULL) && (stcb == NULL)) {
5313                                 inp_decr = inp;
5314                         }
5315                         SCTP_STAT_INCR(sctps_badsum);
5316                         SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5317                         goto out;
5318                 }
5319         }
5320         /* Destination port of 0 is illegal, based on RFC4960. */
5321         if (sh->dest_port == 0) {
5322                 SCTP_STAT_INCR(sctps_hdrops);
5323                 goto out;
5324         }
5325         stcb = sctp_findassociation_addr(m, offset, src, dst,
5326             sh, ch, &inp, &net, vrf_id);
5327 #if defined(INET) || defined(INET6)
5328         if ((ch->chunk_type != SCTP_INITIATION) &&
5329             (net != NULL) && (net->port != port)) {
5330                 if (net->port == 0) {
5331                         /* UDP encapsulation turned on. */
5332                         net->mtu -= sizeof(struct udphdr);
5333                         if (stcb->asoc.smallest_mtu > net->mtu) {
5334                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5335                         }
5336                 } else if (port == 0) {
5337                         /* UDP encapsulation turned off. */
5338                         net->mtu += sizeof(struct udphdr);
5339                         /* XXX Update smallest_mtu */
5340                 }
5341                 net->port = port;
5342         }
5343 #endif
5344         if (net != NULL) {
5345                 net->flowtype = mflowtype;
5346                 net->flowid = mflowid;
5347         }
5348         if (inp == NULL) {
5349                 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5350                 SCTP_STAT_INCR(sctps_noport);
5351                 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5352                         goto out;
5353                 }
5354                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5355                         sctp_send_shutdown_complete2(src, dst, sh,
5356                             mflowtype, mflowid, fibnum,
5357                             vrf_id, port);
5358                         goto out;
5359                 }
5360                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5361                         goto out;
5362                 }
5363                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5364                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5365                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5366                             (ch->chunk_type != SCTP_INIT))) {
5367                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5368                                     "Out of the blue");
5369                                 sctp_send_abort(m, iphlen, src, dst,
5370                                     sh, 0, op_err,
5371                                     mflowtype, mflowid, fibnum,
5372                                     vrf_id, port);
5373                         }
5374                 }
5375                 goto out;
5376         } else if (stcb == NULL) {
5377                 inp_decr = inp;
5378         }
5379         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5380             (void *)m, iphlen, offset, length, (void *)stcb);
5381         if (stcb) {
5382                 /* always clear this before beginning a packet */
5383                 stcb->asoc.authenticated = 0;
5384                 stcb->asoc.seen_a_sack_this_pkt = 0;
5385                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5386                     (void *)stcb, stcb->asoc.state);
5387
5388                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5389                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5390                         /*-
5391                          * If we hit here, we had a ref count
5392                          * up when the assoc was aborted and the
5393                          * timer is clearing out the assoc, we should
5394                          * NOT respond to any packet.. its OOTB.
5395                          */
5396                         SCTP_TCB_UNLOCK(stcb);
5397                         stcb = NULL;
5398                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5399                         SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5400                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5401                             msg);
5402                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5403                             mflowtype, mflowid, inp->fibnum,
5404                             vrf_id, port);
5405                         goto out;
5406                 }
5407         }
5408         if (IS_SCTP_CONTROL(ch)) {
5409                 /* process the control portion of the SCTP packet */
5410                 /* sa_ignore NO_NULL_CHK */
5411                 stcb = sctp_process_control(m, iphlen, &offset, length,
5412                     src, dst, sh, ch,
5413                     inp, stcb, &net, &fwd_tsn_seen,
5414                     mflowtype, mflowid, fibnum,
5415                     vrf_id, port);
5416                 if (stcb) {
5417                         /*
5418                          * This covers us if the cookie-echo was there and
5419                          * it changes our INP.
5420                          */
5421                         inp = stcb->sctp_ep;
5422 #if defined(INET) || defined(INET6)
5423                         if ((ch->chunk_type != SCTP_INITIATION) &&
5424                             (net != NULL) && (net->port != port)) {
5425                                 if (net->port == 0) {
5426                                         /* UDP encapsulation turned on. */
5427                                         net->mtu -= sizeof(struct udphdr);
5428                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5429                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5430                                         }
5431                                 } else if (port == 0) {
5432                                         /* UDP encapsulation turned off. */
5433                                         net->mtu += sizeof(struct udphdr);
5434                                         /* XXX Update smallest_mtu */
5435                                 }
5436                                 net->port = port;
5437                         }
5438 #endif
5439                 }
5440         } else {
5441                 /*
5442                  * no control chunks, so pre-process DATA chunks (these
5443                  * checks are taken care of by control processing)
5444                  */
5445
5446                 /*
5447                  * if DATA only packet, and auth is required, then punt...
5448                  * can't have authenticated without any AUTH (control)
5449                  * chunks
5450                  */
5451                 if ((stcb != NULL) &&
5452                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5453                         /* "silently" ignore */
5454                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5455                         SCTP_STAT_INCR(sctps_recvauthmissing);
5456                         goto out;
5457                 }
5458                 if (stcb == NULL) {
5459                         /* out of the blue DATA chunk */
5460                         SCTP_PROBE5(receive, NULL, NULL, m, NULL, sh);
5461                         SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5462                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5463                             msg);
5464                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5465                             mflowtype, mflowid, fibnum,
5466                             vrf_id, port);
5467                         goto out;
5468                 }
5469                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5470                         /* v_tag mismatch! */
5471                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5472                         SCTP_STAT_INCR(sctps_badvtag);
5473                         goto out;
5474                 }
5475         }
5476
5477         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5478         if (stcb == NULL) {
5479                 /*
5480                  * no valid TCB for this packet, or we found it's a bad
5481                  * packet while processing control, or we're done with this
5482                  * packet (done or skip rest of data), so we drop it...
5483                  */
5484                 goto out;
5485         }
5486
5487         /*
5488          * DATA chunk processing
5489          */
5490         /* plow through the data chunks while length > offset */
5491
5492         /*
5493          * Rest should be DATA only.  Check authentication state if AUTH for
5494          * DATA is required.
5495          */
5496         if ((length > offset) &&
5497             (stcb != NULL) &&
5498             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5499             !stcb->asoc.authenticated) {
5500                 /* "silently" ignore */
5501                 SCTP_STAT_INCR(sctps_recvauthmissing);
5502                 SCTPDBG(SCTP_DEBUG_AUTH1,
5503                     "Data chunk requires AUTH, skipped\n");
5504                 goto trigger_send;
5505         }
5506         if (length > offset) {
5507                 int retval;
5508
5509                 /*
5510                  * First check to make sure our state is correct. We would
5511                  * not get here unless we really did have a tag, so we don't
5512                  * abort if this happens, just dump the chunk silently.
5513                  */
5514                 switch (SCTP_GET_STATE(stcb)) {
5515                 case SCTP_STATE_COOKIE_ECHOED:
5516                         /*
5517                          * we consider data with valid tags in this state
5518                          * shows us the cookie-ack was lost. Imply it was
5519                          * there.
5520                          */
5521                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5522                         break;
5523                 case SCTP_STATE_COOKIE_WAIT:
5524                         /*
5525                          * We consider OOTB any data sent during asoc setup.
5526                          */
5527                         SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5528                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5529                             msg);
5530                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5531                             mflowtype, mflowid, inp->fibnum,
5532                             vrf_id, port);
5533                         goto out;
5534                         /* sa_ignore NOTREACHED */
5535                         break;
5536                 case SCTP_STATE_EMPTY:  /* should not happen */
5537                 case SCTP_STATE_INUSE:  /* should not happen */
5538                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5539                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5540                 default:
5541                         goto out;
5542                         /* sa_ignore NOTREACHED */
5543                         break;
5544                 case SCTP_STATE_OPEN:
5545                 case SCTP_STATE_SHUTDOWN_SENT:
5546                         break;
5547                 }
5548                 /* plow through the data chunks while length > offset */
5549                 retval = sctp_process_data(mm, iphlen, &offset, length,
5550                     inp, stcb, net, &high_tsn);
5551                 if (retval == 2) {
5552                         /*
5553                          * The association aborted, NO UNLOCK needed since
5554                          * the association is destroyed.
5555                          */
5556                         stcb = NULL;
5557                         goto out;
5558                 }
5559                 if (retval == 0) {
5560                         data_processed = 1;
5561                 }
5562                 /*
5563                  * Anything important needs to have been m_copy'ed in
5564                  * process_data
5565                  */
5566         }
5567
5568         /* take care of ecn */
5569         if ((data_processed == 1) &&
5570             (stcb->asoc.ecn_supported == 1) &&
5571             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5572                 /* Yep, we need to add a ECNE */
5573                 sctp_send_ecn_echo(stcb, net, high_tsn);
5574         }
5575
5576         if ((data_processed == 0) && (fwd_tsn_seen)) {
5577                 int was_a_gap;
5578                 uint32_t highest_tsn;
5579
5580                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
5581                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
5582                 } else {
5583                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
5584                 }
5585                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
5586                 stcb->asoc.send_sack = 1;
5587                 sctp_sack_check(stcb, was_a_gap);
5588         } else if (fwd_tsn_seen) {
5589                 stcb->asoc.send_sack = 1;
5590         }
5591         /* trigger send of any chunks in queue... */
5592 trigger_send:
5593 #ifdef SCTP_AUDITING_ENABLED
5594         sctp_audit_log(0xE0, 2);
5595         sctp_auditing(1, inp, stcb, net);
5596 #endif
5597         SCTPDBG(SCTP_DEBUG_INPUT1,
5598             "Check for chunk output prw:%d tqe:%d tf=%d\n",
5599             stcb->asoc.peers_rwnd,
5600             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
5601             stcb->asoc.total_flight);
5602         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
5603         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
5604                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
5605         }
5606         if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) ||
5607             cnt_ctrl_ready ||
5608             stcb->asoc.trigger_reset ||
5609             ((un_sent > 0) &&
5610             (stcb->asoc.peers_rwnd > 0 || stcb->asoc.total_flight == 0))) {
5611                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
5612                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5613                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
5614         }
5615 #ifdef SCTP_AUDITING_ENABLED
5616         sctp_audit_log(0xE0, 3);
5617         sctp_auditing(2, inp, stcb, net);
5618 #endif
5619 out:
5620         if (stcb != NULL) {
5621                 SCTP_TCB_UNLOCK(stcb);
5622         }
5623         if (inp_decr != NULL) {
5624                 /* reduce ref-count */
5625                 SCTP_INP_WLOCK(inp_decr);
5626                 SCTP_INP_DECR_REF(inp_decr);
5627                 SCTP_INP_WUNLOCK(inp_decr);
5628         }
5629         return;
5630 }
5631
5632 #ifdef INET
5633 void
5634 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
5635 {
5636         struct mbuf *m;
5637         int iphlen;
5638         uint32_t vrf_id = 0;
5639         uint8_t ecn_bits;
5640         struct sockaddr_in src, dst;
5641         struct ip *ip;
5642         struct sctphdr *sh;
5643         struct sctp_chunkhdr *ch;
5644         int length, offset;
5645         uint8_t compute_crc;
5646         uint32_t mflowid;
5647         uint8_t mflowtype;
5648         uint16_t fibnum;
5649
5650         iphlen = off;
5651         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
5652                 SCTP_RELEASE_PKT(i_pak);
5653                 return;
5654         }
5655         m = SCTP_HEADER_TO_CHAIN(i_pak);
5656 #ifdef SCTP_MBUF_LOGGING
5657         /* Log in any input mbufs */
5658         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5659                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
5660         }
5661 #endif
5662 #ifdef SCTP_PACKET_LOGGING
5663         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
5664                 sctp_packet_log(m);
5665         }
5666 #endif
5667         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
5668             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
5669             m->m_pkthdr.len,
5670             if_name(m->m_pkthdr.rcvif),
5671             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
5672         mflowid = m->m_pkthdr.flowid;
5673         mflowtype = M_HASHTYPE_GET(m);
5674         fibnum = M_GETFIB(m);
5675         SCTP_STAT_INCR(sctps_recvpackets);
5676         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
5677         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
5678         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5679         if (SCTP_BUF_LEN(m) < offset) {
5680                 if ((m = m_pullup(m, offset)) == NULL) {
5681                         SCTP_STAT_INCR(sctps_hdrops);
5682                         return;
5683                 }
5684         }
5685         ip = mtod(m, struct ip *);
5686         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
5687         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
5688         offset -= sizeof(struct sctp_chunkhdr);
5689         memset(&src, 0, sizeof(struct sockaddr_in));
5690         src.sin_family = AF_INET;
5691         src.sin_len = sizeof(struct sockaddr_in);
5692         src.sin_port = sh->src_port;
5693         src.sin_addr = ip->ip_src;
5694         memset(&dst, 0, sizeof(struct sockaddr_in));
5695         dst.sin_family = AF_INET;
5696         dst.sin_len = sizeof(struct sockaddr_in);
5697         dst.sin_port = sh->dest_port;
5698         dst.sin_addr = ip->ip_dst;
5699         length = ntohs(ip->ip_len);
5700         /* Validate mbuf chain length with IP payload length. */
5701         if (SCTP_HEADER_LEN(m) != length) {
5702                 SCTPDBG(SCTP_DEBUG_INPUT1,
5703                     "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
5704                 SCTP_STAT_INCR(sctps_hdrops);
5705                 goto out;
5706         }
5707         /* SCTP does not allow broadcasts or multicasts */
5708         if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
5709                 goto out;
5710         }
5711         if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
5712                 goto out;
5713         }
5714         ecn_bits = ip->ip_tos;
5715         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
5716                 SCTP_STAT_INCR(sctps_recvhwcrc);
5717                 compute_crc = 0;
5718         } else {
5719                 SCTP_STAT_INCR(sctps_recvswcrc);
5720                 compute_crc = 1;
5721         }
5722         sctp_common_input_processing(&m, iphlen, offset, length,
5723             (struct sockaddr *)&src,
5724             (struct sockaddr *)&dst,
5725             sh, ch,
5726             compute_crc,
5727             ecn_bits,
5728             mflowtype, mflowid, fibnum,
5729             vrf_id, port);
5730 out:
5731         if (m) {
5732                 sctp_m_freem(m);
5733         }
5734         return;
5735 }
5736
5737 #if defined(SCTP_MCORE_INPUT) && defined(SMP)
5738 extern int *sctp_cpuarry;
5739 #endif
5740
5741 int
5742 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED)
5743 {
5744         struct mbuf *m;
5745         int off;
5746
5747         m = *mp;
5748         off = *offp;
5749 #if defined(SCTP_MCORE_INPUT) && defined(SMP)
5750         if (mp_ncpus > 1) {
5751                 struct ip *ip;
5752                 struct sctphdr *sh;
5753                 int offset;
5754                 int cpu_to_use;
5755                 uint32_t flowid, tag;
5756
5757                 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
5758                         flowid = m->m_pkthdr.flowid;
5759                 } else {
5760                         /*
5761                          * No flow id built by lower layers fix it so we
5762                          * create one.
5763                          */
5764                         offset = off + sizeof(struct sctphdr);
5765                         if (SCTP_BUF_LEN(m) < offset) {
5766                                 if ((m = m_pullup(m, offset)) == NULL) {
5767                                         SCTP_STAT_INCR(sctps_hdrops);
5768                                         return (IPPROTO_DONE);
5769                                 }
5770                         }
5771                         ip = mtod(m, struct ip *);
5772                         sh = (struct sctphdr *)((caddr_t)ip + off);
5773                         tag = htonl(sh->v_tag);
5774                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
5775                         m->m_pkthdr.flowid = flowid;
5776                         M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH);
5777                 }
5778                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
5779                 sctp_queue_to_mcore(m, off, cpu_to_use);
5780                 return (IPPROTO_DONE);
5781         }
5782 #endif
5783         sctp_input_with_port(m, off, 0);
5784         return (IPPROTO_DONE);
5785 }
5786 #endif