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
  59
  60 static void
  61 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb)
  62 {
  63         struct sctp_nets *net;
  64
  65         /*
  66          * This now not only stops all cookie timers it also stops any INIT
  67          * timers as well. This will make sure that the timers are stopped
  68          * in all collision cases.
  69          */
  70         SCTP_TCB_LOCK_ASSERT(stcb);
  71         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
  72                 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) {
  73                         sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE,
  74                             stcb->sctp_ep,
  75                             stcb,
  76                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1);
  77                 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) {
  78                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT,
  79                             stcb->sctp_ep,
  80                             stcb,
  81                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2);
  82                 }
  83         }
  84 }
  85
  86 /* INIT handler */
  87 static void
  88 sctp_handle_init(struct mbuf *m, int iphlen, int offset,
  89     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
  90     struct sctp_init_chunk *cp, struct sctp_inpcb *inp,
  91     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_no_unlock,
  92     uint8_t mflowtype, uint32_t mflowid,
  93     uint32_t vrf_id, uint16_t port)
  94 {
  95         struct sctp_init *init;
  96         struct mbuf *op_err;
  97
  98         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
  99             (void *)stcb);
 100         if (stcb == NULL) {
 101                 SCTP_INP_RLOCK(inp);
 102         }
 103         /* validate length */
 104         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) {
 105                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 106                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 107                     mflowtype, mflowid,
 108                     vrf_id, port);
 109                 if (stcb)
 110                         *abort_no_unlock = 1;
 111                 goto outnow;
 112         }
 113         /* validate parameters */
 114         init = &cp->init;
 115         if (init->initiate_tag == 0) {
 116                 /* protocol error... send abort */
 117                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 118                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 119                     mflowtype, mflowid,
 120                     vrf_id, port);
 121                 if (stcb)
 122                         *abort_no_unlock = 1;
 123                 goto outnow;
 124         }
 125         if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) {
 126                 /* invalid parameter... send abort */
 127                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 128                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 129                     mflowtype, mflowid,
 130                     vrf_id, port);
 131                 if (stcb)
 132                         *abort_no_unlock = 1;
 133                 goto outnow;
 134         }
 135         if (init->num_inbound_streams == 0) {
 136                 /* protocol error... send abort */
 137                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 138                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 139                     mflowtype, mflowid,
 140                     vrf_id, port);
 141                 if (stcb)
 142                         *abort_no_unlock = 1;
 143                 goto outnow;
 144         }
 145         if (init->num_outbound_streams == 0) {
 146                 /* protocol error... send abort */
 147                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 148                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 149                     mflowtype, mflowid,
 150                     vrf_id, port);
 151                 if (stcb)
 152                         *abort_no_unlock = 1;
 153                 goto outnow;
 154         }
 155         if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
 156             offset + ntohs(cp->ch.chunk_length))) {
 157                 /* auth parameter(s) error... send abort */
 158                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 159                     "Problem with AUTH parameters");
 160                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 161                     mflowtype, mflowid,
 162                     vrf_id, port);
 163                 if (stcb)
 164                         *abort_no_unlock = 1;
 165                 goto outnow;
 166         }
 167         /* We are only accepting if we have a listening socket. */
 168         if ((stcb == NULL) &&
 169             ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
 170             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
 171             (!SCTP_IS_LISTENING(inp)))) {
 172                 /*
 173                  * FIX ME ?? What about TCP model and we have a
 174                  * match/restart case? Actually no fix is needed. the lookup
 175                  * will always find the existing assoc so stcb would not be
 176                  * NULL. It may be questionable to do this since we COULD
 177                  * just send back the INIT-ACK and hope that the app did
 178                  * accept()'s by the time the COOKIE was sent. But there is
 179                  * a price to pay for COOKIE generation and I don't want to
 180                  * pay it on the chance that the app will actually do some
 181                  * accepts(). The App just looses and should NOT be in this
 182                  * state :-)
 183                  */
 184                 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) {
 185                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 186                             "No listener");
 187                         sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
 188                             mflowtype, mflowid, inp->fibnum,
 189                             vrf_id, port);
 190                 }
 191                 goto outnow;
 192         }
 193         if ((stcb != NULL) &&
 194             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 195                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n");
 196                 sctp_send_shutdown_ack(stcb, NULL);
 197                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
 198         } else {
 199                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
 200                 sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset,
 201                     src, dst, sh, cp,
 202                     mflowtype, mflowid,
 203                     vrf_id, port);
 204         }
 205 outnow:
 206         if (stcb == NULL) {
 207                 SCTP_INP_RUNLOCK(inp);
 208         }
 209 }
 210
 211 /*
 212  * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
 213  */
 214
 215 int
 216 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked
 217 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 218     SCTP_UNUSED
 219 #endif
 220 )
 221 {
 222         int unsent_data;
 223         unsigned int i;
 224         struct sctp_stream_queue_pending *sp;
 225         struct sctp_association *asoc;
 226
 227         /*
 228          * This function returns if any stream has true unsent data on it.
 229          * Note that as it looks through it will clean up any places that
 230          * have old data that has been sent but left at top of stream queue.
 231          */
 232         asoc = &stcb->asoc;
 233         unsent_data = 0;
 234         SCTP_TCB_SEND_LOCK(stcb);
 235         if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
 236                 /* Check to see if some data queued */
 237                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 238                         /* sa_ignore FREED_MEMORY */
 239                         sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
 240                         if (sp == NULL) {
 241                                 continue;
 242                         }
 243                         if ((sp->msg_is_complete) &&
 244                             (sp->length == 0) &&
 245                             (sp->sender_all_done)) {
 246                                 /*
 247                                  * We are doing differed cleanup. Last time
 248                                  * through when we took all the data the
 249                                  * sender_all_done was not set.
 250                                  */
 251                                 if (sp->put_last_out == 0) {
 252                                         SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
 253                                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
 254                                             sp->sender_all_done,
 255                                             sp->length,
 256                                             sp->msg_is_complete,
 257                                             sp->put_last_out);
 258                                 }
 259                                 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 260                                 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
 261                                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp, 1);
 262                                 if (sp->net) {
 263                                         sctp_free_remote_addr(sp->net);
 264                                         sp->net = NULL;
 265                                 }
 266                                 if (sp->data) {
 267                                         sctp_m_freem(sp->data);
 268                                         sp->data = NULL;
 269                                 }
 270                                 sctp_free_a_strmoq(stcb, sp, so_locked);
 271                                 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
 272                                         unsent_data++;
 273                                 }
 274                         } else {
 275                                 unsent_data++;
 276                         }
 277                         if (unsent_data > 0) {
 278                                 break;
 279                         }
 280                 }
 281         }
 282         SCTP_TCB_SEND_UNLOCK(stcb);
 283         return (unsent_data);
 284 }
 285
 286 static int
 287 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb)
 288 {
 289         struct sctp_init *init;
 290         struct sctp_association *asoc;
 291         struct sctp_nets *lnet;
 292         unsigned int i;
 293
 294         init = &cp->init;
 295         asoc = &stcb->asoc;
 296         /* save off parameters */
 297         asoc->peer_vtag = ntohl(init->initiate_tag);
 298         asoc->peers_rwnd = ntohl(init->a_rwnd);
 299         /* init tsn's */
 300         asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
 301
 302         if (!TAILQ_EMPTY(&asoc->nets)) {
 303                 /* update any ssthresh's that may have a default */
 304                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
 305                         lnet->ssthresh = asoc->peers_rwnd;
 306                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
 307                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
 308                         }
 309
 310                 }
 311         }
 312         SCTP_TCB_SEND_LOCK(stcb);
 313         if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
 314                 unsigned int newcnt;
 315                 struct sctp_stream_out *outs;
 316                 struct sctp_stream_queue_pending *sp, *nsp;
 317                 struct sctp_tmit_chunk *chk, *nchk;
 318
 319                 /* abandon the upper streams */
 320                 newcnt = ntohs(init->num_inbound_streams);
 321                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
 322                         if (chk->rec.data.sid >= newcnt) {
 323                                 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
 324                                 asoc->send_queue_cnt--;
 325                                 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) {
 326                                         asoc->strmout[chk->rec.data.sid].chunks_on_queues--;
 327 #ifdef INVARIANTS
 328                                 } else {
 329                                         panic("No chunks on the queues for sid %u.", chk->rec.data.sid);
 330 #endif
 331                                 }
 332                                 if (chk->data != NULL) {
 333                                         sctp_free_bufspace(stcb, asoc, chk, 1);
 334                                         sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb,
 335                                             0, chk, SCTP_SO_NOT_LOCKED);
 336                                         if (chk->data) {
 337                                                 sctp_m_freem(chk->data);
 338                                                 chk->data = NULL;
 339                                         }
 340                                 }
 341                                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 342                                 /* sa_ignore FREED_MEMORY */
 343                         }
 344                 }
 345                 if (asoc->strmout) {
 346                         for (i = newcnt; i < asoc->pre_open_streams; i++) {
 347                                 outs = &asoc->strmout[i];
 348                                 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
 349                                         atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 350                                         TAILQ_REMOVE(&outs->outqueue, sp, next);
 351                                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp, 1);
 352                                         sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
 353                                             stcb, 0, sp, SCTP_SO_NOT_LOCKED);
 354                                         if (sp->data) {
 355                                                 sctp_m_freem(sp->data);
 356                                                 sp->data = NULL;
 357                                         }
 358                                         if (sp->net) {
 359                                                 sctp_free_remote_addr(sp->net);
 360                                                 sp->net = NULL;
 361                                         }
 362                                         /* Free the chunk */
 363                                         sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
 364                                         /* sa_ignore FREED_MEMORY */
 365                                 }
 366                                 outs->state = SCTP_STREAM_CLOSED;
 367                         }
 368                 }
 369                 /* cut back the count */
 370                 asoc->pre_open_streams = newcnt;
 371         }
 372         SCTP_TCB_SEND_UNLOCK(stcb);
 373         asoc->streamoutcnt = asoc->pre_open_streams;
 374         if (asoc->strmout) {
 375                 for (i = 0; i < asoc->streamoutcnt; i++) {
 376                         asoc->strmout[i].state = SCTP_STREAM_OPEN;
 377                 }
 378         }
 379         /* EY - nr_sack: initialize highest tsn in nr_mapping_array */
 380         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
 381         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
 382                 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 383         }
 384         /* This is the next one we expect */
 385         asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
 386
 387         asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
 388         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
 389
 390         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
 391         /* open the requested streams */
 392
 393         if (asoc->strmin != NULL) {
 394                 /* Free the old ones */
 395                 for (i = 0; i < asoc->streamincnt; i++) {
 396                         sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue);
 397                         sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue);
 398                 }
 399                 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
 400         }
 401         if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) {
 402                 asoc->streamincnt = ntohs(init->num_outbound_streams);
 403         } else {
 404                 asoc->streamincnt = asoc->max_inbound_streams;
 405         }
 406         SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
 407             sizeof(struct sctp_stream_in), SCTP_M_STRMI);
 408         if (asoc->strmin == NULL) {
 409                 /* we didn't get memory for the streams! */
 410                 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
 411                 return (-1);
 412         }
 413         for (i = 0; i < asoc->streamincnt; i++) {
 414                 asoc->strmin[i].sid = i;
 415                 asoc->strmin[i].last_mid_delivered = 0xffffffff;
 416                 TAILQ_INIT(&asoc->strmin[i].inqueue);
 417                 TAILQ_INIT(&asoc->strmin[i].uno_inqueue);
 418                 asoc->strmin[i].pd_api_started = 0;
 419                 asoc->strmin[i].delivery_started = 0;
 420         }
 421         /*
 422          * load_address_from_init will put the addresses into the
 423          * association when the COOKIE is processed or the INIT-ACK is
 424          * processed. Both types of COOKIE's existing and new call this
 425          * routine. It will remove addresses that are no longer in the
 426          * association (for the restarting case where addresses are
 427          * removed). Up front when the INIT arrives we will discard it if it
 428          * is a restart and new addresses have been added.
 429          */
 430         /* sa_ignore MEMLEAK */
 431         return (0);
 432 }
 433
 434 /*
 435  * INIT-ACK message processing/consumption returns value < 0 on error
 436  */
 437 static int
 438 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
 439     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
 440     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
 441     struct sctp_nets *net, int *abort_no_unlock,
 442     uint8_t mflowtype, uint32_t mflowid,
 443     uint32_t vrf_id)
 444 {
 445         struct sctp_association *asoc;
 446         struct mbuf *op_err;
 447         int retval, abort_flag, cookie_found;
 448         int initack_limit;
 449         int nat_friendly = 0;
 450
 451         /* First verify that we have no illegal param's */
 452         abort_flag = 0;
 453         cookie_found = 0;
 454
 455         op_err = sctp_arethere_unrecognized_parameters(m,
 456             (offset + sizeof(struct sctp_init_chunk)),
 457             &abort_flag, (struct sctp_chunkhdr *)cp,
 458             &nat_friendly, &cookie_found);
 459         if (abort_flag) {
 460                 /* Send an abort and notify peer */
 461                 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
 462                 *abort_no_unlock = 1;
 463                 return (-1);
 464         }
 465         if (!cookie_found) {
 466                 uint16_t len;
 467
 468                 /* Only report the missing cookie parameter */
 469                 if (op_err != NULL) {
 470                         sctp_m_freem(op_err);
 471                 }
 472                 len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t));
 473                 /* We abort with an error of missing mandatory param */
 474                 op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA);
 475                 if (op_err != NULL) {
 476                         struct sctp_error_missing_param *cause;
 477
 478                         SCTP_BUF_LEN(op_err) = len;
 479                         cause = mtod(op_err, struct sctp_error_missing_param *);
 480                         /* Subtract the reserved param */
 481                         cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM);
 482                         cause->cause.length = htons(len);
 483                         cause->num_missing_params = htonl(1);
 484                         cause->type[0] = htons(SCTP_STATE_COOKIE);
 485                 }
 486                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 487                     src, dst, sh, op_err,
 488                     mflowtype, mflowid,
 489                     vrf_id, net->port);
 490                 *abort_no_unlock = 1;
 491                 return (-3);
 492         }
 493         asoc = &stcb->asoc;
 494         asoc->peer_supports_nat = (uint8_t)nat_friendly;
 495         /* process the peer's parameters in the INIT-ACK */
 496         retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb);
 497         if (retval < 0) {
 498                 if (op_err != NULL) {
 499                         sctp_m_freem(op_err);
 500                 }
 501                 return (retval);
 502         }
 503         initack_limit = offset + ntohs(cp->ch.chunk_length);
 504         /* load all addresses */
 505         if ((retval = sctp_load_addresses_from_init(stcb, m,
 506             (offset + sizeof(struct sctp_init_chunk)), initack_limit,
 507             src, dst, NULL, stcb->asoc.port))) {
 508                 if (op_err != NULL) {
 509                         sctp_m_freem(op_err);
 510                 }
 511                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 512                     "Problem with address parameters");
 513                 SCTPDBG(SCTP_DEBUG_INPUT1,
 514                     "Load addresses from INIT causes an abort %d\n",
 515                     retval);
 516                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 517                     src, dst, sh, op_err,
 518                     mflowtype, mflowid,
 519                     vrf_id, net->port);
 520                 *abort_no_unlock = 1;
 521                 return (-1);
 522         }
 523         /* if the peer doesn't support asconf, flush the asconf queue */
 524         if (asoc->asconf_supported == 0) {
 525                 struct sctp_asconf_addr *param, *nparam;
 526
 527                 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
 528                         TAILQ_REMOVE(&asoc->asconf_queue, param, next);
 529                         SCTP_FREE(param, SCTP_M_ASC_ADDR);
 530                 }
 531         }
 532
 533         stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
 534             stcb->asoc.local_hmacs);
 535         if (op_err) {
 536                 sctp_queue_op_err(stcb, op_err);
 537                 /* queuing will steal away the mbuf chain to the out queue */
 538                 op_err = NULL;
 539         }
 540         /* extract the cookie and queue it to "echo" it back... */
 541         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 542                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 543                     stcb->asoc.overall_error_count,
 544                     0,
 545                     SCTP_FROM_SCTP_INPUT,
 546                     __LINE__);
 547         }
 548         stcb->asoc.overall_error_count = 0;
 549         net->error_count = 0;
 550
 551         /*
 552          * Cancel the INIT timer, We do this first before queueing the
 553          * cookie. We always cancel at the primary to assue that we are
 554          * canceling the timer started by the INIT which always goes to the
 555          * primary.
 556          */
 557         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
 558             asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 559
 560         /* calculate the RTO */
 561         sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered,
 562             SCTP_RTT_FROM_NON_DATA);
 563         retval = sctp_send_cookie_echo(m, offset, initack_limit, stcb, net);
 564         return (retval);
 565 }
 566
 567 static void
 568 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
 569     struct sctp_tcb *stcb, struct sctp_nets *net)
 570 {
 571         union sctp_sockstore store;
 572         struct sctp_nets *r_net, *f_net;
 573         struct timeval tv;
 574         int req_prim = 0;
 575         uint16_t old_error_counter;
 576
 577         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
 578                 /* Invalid length */
 579                 return;
 580         }
 581
 582         memset(&store, 0, sizeof(store));
 583         switch (cp->heartbeat.hb_info.addr_family) {
 584 #ifdef INET
 585         case AF_INET:
 586                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
 587                         store.sin.sin_family = cp->heartbeat.hb_info.addr_family;
 588                         store.sin.sin_len = cp->heartbeat.hb_info.addr_len;
 589                         store.sin.sin_port = stcb->rport;
 590                         memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address,
 591                             sizeof(store.sin.sin_addr));
 592                 } else {
 593                         return;
 594                 }
 595                 break;
 596 #endif
 597 #ifdef INET6
 598         case AF_INET6:
 599                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
 600                         store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family;
 601                         store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len;
 602                         store.sin6.sin6_port = stcb->rport;
 603                         memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr));
 604                 } else {
 605                         return;
 606                 }
 607                 break;
 608 #endif
 609         default:
 610                 return;
 611         }
 612         r_net = sctp_findnet(stcb, &store.sa);
 613         if (r_net == NULL) {
 614                 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
 615                 return;
 616         }
 617         if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 618             (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
 619             (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
 620                 /*
 621                  * If the its a HB and it's random value is correct when can
 622                  * confirm the destination.
 623                  */
 624                 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 625                 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
 626                         stcb->asoc.primary_destination = r_net;
 627                         r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
 628                         f_net = TAILQ_FIRST(&stcb->asoc.nets);
 629                         if (f_net != r_net) {
 630                                 /*
 631                                  * first one on the list is NOT the primary
 632                                  * sctp_cmpaddr() is much more efficient if
 633                                  * the primary is the first on the list,
 634                                  * make it so.
 635                                  */
 636                                 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
 637                                 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
 638                         }
 639                         req_prim = 1;
 640                 }
 641                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 642                     stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 643                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb,
 644                     r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
 645                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 646         }
 647         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 648                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 649                     stcb->asoc.overall_error_count,
 650                     0,
 651                     SCTP_FROM_SCTP_INPUT,
 652                     __LINE__);
 653         }
 654         stcb->asoc.overall_error_count = 0;
 655         old_error_counter = r_net->error_count;
 656         r_net->error_count = 0;
 657         r_net->hb_responded = 1;
 658         tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
 659         tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
 660         /* Now lets do a RTO with this */
 661         sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv,
 662             SCTP_RTT_FROM_NON_DATA);
 663         if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
 664                 r_net->dest_state |= SCTP_ADDR_REACHABLE;
 665                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
 666                     0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 667         }
 668         if (r_net->dest_state & SCTP_ADDR_PF) {
 669                 r_net->dest_state &= ~SCTP_ADDR_PF;
 670                 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
 671         }
 672         if (old_error_counter > 0) {
 673                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
 674                     stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5);
 675                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 676         }
 677         if (r_net == stcb->asoc.primary_destination) {
 678                 if (stcb->asoc.alternate) {
 679                         /* release the alternate, primary is good */
 680                         sctp_free_remote_addr(stcb->asoc.alternate);
 681                         stcb->asoc.alternate = NULL;
 682                 }
 683         }
 684         /* Mobility adaptation */
 685         if (req_prim) {
 686                 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
 687                     SCTP_MOBILITY_BASE) ||
 688                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 689                     SCTP_MOBILITY_FASTHANDOFF)) &&
 690                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 691                     SCTP_MOBILITY_PRIM_DELETED)) {
 692
 693                         sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED,
 694                             stcb->sctp_ep, stcb, NULL,
 695                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 696                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 697                             SCTP_MOBILITY_FASTHANDOFF)) {
 698                                 sctp_assoc_immediate_retrans(stcb,
 699                                     stcb->asoc.primary_destination);
 700                         }
 701                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 702                             SCTP_MOBILITY_BASE)) {
 703                                 sctp_move_chunks_from_net(stcb,
 704                                     stcb->asoc.deleted_primary);
 705                         }
 706                         sctp_delete_prim_timer(stcb->sctp_ep, stcb,
 707                             stcb->asoc.deleted_primary);
 708                 }
 709         }
 710 }
 711
 712 static int
 713 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
 714 {
 715         /*
 716          * Return 0 means we want you to proceed with the abort non-zero
 717          * means no abort processing.
 718          */
 719         uint32_t new_vtag;
 720         struct sctpasochead *head;
 721
 722         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
 723             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
 724                 new_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 725                 atomic_add_int(&stcb->asoc.refcnt, 1);
 726                 SCTP_TCB_UNLOCK(stcb);
 727                 SCTP_INP_INFO_WLOCK();
 728                 SCTP_TCB_LOCK(stcb);
 729                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 730         } else {
 731                 return (0);
 732         }
 733         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) {
 734                 /* generate a new vtag and send init */
 735                 LIST_REMOVE(stcb, sctp_asocs);
 736                 stcb->asoc.my_vtag = new_vtag;
 737                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 738                 /*
 739                  * put it in the bucket in the vtag hash of assoc's for the
 740                  * system
 741                  */
 742                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 743                 SCTP_INP_INFO_WUNLOCK();
 744                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 745                 return (1);
 746         } else {
 747                 /*
 748                  * treat like a case where the cookie expired i.e.: - dump
 749                  * current cookie. - generate a new vtag. - resend init.
 750                  */
 751                 /* generate a new vtag and send init */
 752                 LIST_REMOVE(stcb, sctp_asocs);
 753                 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
 754                 sctp_stop_all_cookie_timers(stcb);
 755                 sctp_toss_old_cookies(stcb, &stcb->asoc);
 756                 stcb->asoc.my_vtag = new_vtag;
 757                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 758                 /*
 759                  * put it in the bucket in the vtag hash of assoc's for the
 760                  * system
 761                  */
 762                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 763                 SCTP_INP_INFO_WUNLOCK();
 764                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 765                 return (1);
 766         }
 767         return (0);
 768 }
 769
 770 static int
 771 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
 772     struct sctp_nets *net)
 773 {
 774         /*
 775          * return 0 means we want you to proceed with the abort non-zero
 776          * means no abort processing
 777          */
 778         if (stcb->asoc.auth_supported == 0) {
 779                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
 780                 return (0);
 781         }
 782         sctp_asconf_send_nat_state_update(stcb, net);
 783         return (1);
 784 }
 785
 786
 787 /* Returns 1 if the stcb was aborted, 0 otherwise */
 788 static int
 789 sctp_handle_abort(struct sctp_abort_chunk *abort,
 790     struct sctp_tcb *stcb, struct sctp_nets *net)
 791 {
 792 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 793         struct socket *so;
 794 #endif
 795         uint16_t len;
 796         uint16_t error;
 797
 798         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
 799         if (stcb == NULL)
 800                 return (0);
 801
 802         len = ntohs(abort->ch.chunk_length);
 803         if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) {
 804                 /*
 805                  * Need to check the cause codes for our two magic nat
 806                  * aborts which don't kill the assoc necessarily.
 807                  */
 808                 struct sctp_error_cause *cause;
 809
 810                 cause = (struct sctp_error_cause *)(abort + 1);
 811                 error = ntohs(cause->code);
 812                 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) {
 813                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
 814                             abort->ch.chunk_flags);
 815                         if (sctp_handle_nat_colliding_state(stcb)) {
 816                                 return (0);
 817                         }
 818                 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) {
 819                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
 820                             abort->ch.chunk_flags);
 821                         if (sctp_handle_nat_missing_state(stcb, net)) {
 822                                 return (0);
 823                         }
 824                 }
 825         } else {
 826                 error = 0;
 827         }
 828         /* stop any receive timers */
 829         sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net,
 830             SCTP_FROM_SCTP_INPUT + SCTP_LOC_7);
 831         /* notify user of the abort and clean up... */
 832         sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED);
 833         /* free the tcb */
 834         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
 835         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
 836             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 837                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 838         }
 839 #ifdef SCTP_ASOCLOG_OF_TSNS
 840         sctp_print_out_track_log(stcb);
 841 #endif
 842 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 843         so = SCTP_INP_SO(stcb->sctp_ep);
 844         atomic_add_int(&stcb->asoc.refcnt, 1);
 845         SCTP_TCB_UNLOCK(stcb);
 846         SCTP_SOCKET_LOCK(so, 1);
 847         SCTP_TCB_LOCK(stcb);
 848         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 849 #endif
 850         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_WAS_ABORTED);
 851         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 852             SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
 853 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 854         SCTP_SOCKET_UNLOCK(so, 1);
 855 #endif
 856         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
 857         return (1);
 858 }
 859
 860 static void
 861 sctp_start_net_timers(struct sctp_tcb *stcb)
 862 {
 863         uint32_t cnt_hb_sent;
 864         struct sctp_nets *net;
 865
 866         cnt_hb_sent = 0;
 867         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 868                 /*
 869                  * For each network start: 1) A pmtu timer. 2) A HB timer 3)
 870                  * If the dest in unconfirmed send a hb as well if under
 871                  * max_hb_burst have been sent.
 872                  */
 873                 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
 874                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
 875                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
 876                     (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
 877                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 878                         cnt_hb_sent++;
 879                 }
 880         }
 881         if (cnt_hb_sent) {
 882                 sctp_chunk_output(stcb->sctp_ep, stcb,
 883                     SCTP_OUTPUT_FROM_COOKIE_ACK,
 884                     SCTP_SO_NOT_LOCKED);
 885         }
 886 }
 887
 888
 889 static void
 890 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
 891     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
 892 {
 893         struct sctp_association *asoc;
 894         int some_on_streamwheel;
 895         int old_state;
 896 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 897         struct socket *so;
 898 #endif
 899
 900         SCTPDBG(SCTP_DEBUG_INPUT2,
 901             "sctp_handle_shutdown: handling SHUTDOWN\n");
 902         if (stcb == NULL)
 903                 return;
 904         asoc = &stcb->asoc;
 905         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
 906             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
 907                 return;
 908         }
 909         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
 910                 /* Shutdown NOT the expected size */
 911                 return;
 912         }
 913         old_state = SCTP_GET_STATE(stcb);
 914         sctp_update_acked(stcb, cp, abort_flag);
 915         if (*abort_flag) {
 916                 return;
 917         }
 918         if (asoc->control_pdapi) {
 919                 /*
 920                  * With a normal shutdown we assume the end of last record.
 921                  */
 922                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 923                 if (asoc->control_pdapi->on_strm_q) {
 924                         struct sctp_stream_in *strm;
 925
 926                         strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream];
 927                         if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) {
 928                                 /* Unordered */
 929                                 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm);
 930                                 asoc->control_pdapi->on_strm_q = 0;
 931                         } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) {
 932                                 /* Ordered */
 933                                 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm);
 934                                 asoc->control_pdapi->on_strm_q = 0;
 935 #ifdef INVARIANTS
 936                         } else {
 937                                 panic("Unknown state on ctrl:%p on_strm_q:%d",
 938                                     asoc->control_pdapi,
 939                                     asoc->control_pdapi->on_strm_q);
 940 #endif
 941                         }
 942                 }
 943                 asoc->control_pdapi->end_added = 1;
 944                 asoc->control_pdapi->pdapi_aborted = 1;
 945                 asoc->control_pdapi = NULL;
 946                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 947 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 948                 so = SCTP_INP_SO(stcb->sctp_ep);
 949                 atomic_add_int(&stcb->asoc.refcnt, 1);
 950                 SCTP_TCB_UNLOCK(stcb);
 951                 SCTP_SOCKET_LOCK(so, 1);
 952                 SCTP_TCB_LOCK(stcb);
 953                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 954                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 955                         /* assoc was freed while we were unlocked */
 956                         SCTP_SOCKET_UNLOCK(so, 1);
 957                         return;
 958                 }
 959 #endif
 960                 if (stcb->sctp_socket) {
 961                         sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 962                 }
 963 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 964                 SCTP_SOCKET_UNLOCK(so, 1);
 965 #endif
 966         }
 967         /* goto SHUTDOWN_RECEIVED state to block new requests */
 968         if (stcb->sctp_socket) {
 969                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 970                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
 971                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) {
 972                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_RECEIVED);
 973                         /*
 974                          * notify upper layer that peer has initiated a
 975                          * shutdown
 976                          */
 977                         sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 978
 979                         /* reset time */
 980                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
 981                 }
 982         }
 983         if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) {
 984                 /*
 985                  * stop the shutdown timer, since we WILL move to
 986                  * SHUTDOWN-ACK-SENT.
 987                  */
 988                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
 989                     net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
 990         }
 991         /* Now is there unsent data on a stream somewhere? */
 992         some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
 993
 994         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 995             !TAILQ_EMPTY(&asoc->sent_queue) ||
 996             some_on_streamwheel) {
 997                 /* By returning we will push more data out */
 998                 return;
 999         } else {
1000                 /* no outstanding data to send, so move on... */
1001                 /* send SHUTDOWN-ACK */
1002                 /* move to SHUTDOWN-ACK-SENT state */
1003                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
1004                     (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
1005                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
1006                 }
1007                 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
1008                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_ACK_SENT);
1009                         sctp_stop_timers_for_shutdown(stcb);
1010                         sctp_send_shutdown_ack(stcb, net);
1011                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
1012                             stcb->sctp_ep, stcb, net);
1013                 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1014                         sctp_send_shutdown_ack(stcb, net);
1015                 }
1016         }
1017 }
1018
1019 static void
1020 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
1021     struct sctp_tcb *stcb,
1022     struct sctp_nets *net)
1023 {
1024         struct sctp_association *asoc;
1025 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1026         struct socket *so;
1027
1028         so = SCTP_INP_SO(stcb->sctp_ep);
1029 #endif
1030         SCTPDBG(SCTP_DEBUG_INPUT2,
1031             "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
1032         if (stcb == NULL)
1033                 return;
1034
1035         asoc = &stcb->asoc;
1036         /* process according to association state */
1037         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
1038             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
1039                 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
1040                 sctp_send_shutdown_complete(stcb, net, 1);
1041                 SCTP_TCB_UNLOCK(stcb);
1042                 return;
1043         }
1044         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
1045             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
1046                 /* unexpected SHUTDOWN-ACK... so ignore... */
1047                 SCTP_TCB_UNLOCK(stcb);
1048                 return;
1049         }
1050         if (asoc->control_pdapi) {
1051                 /*
1052                  * With a normal shutdown we assume the end of last record.
1053                  */
1054                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
1055                 asoc->control_pdapi->end_added = 1;
1056                 asoc->control_pdapi->pdapi_aborted = 1;
1057                 asoc->control_pdapi = NULL;
1058                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
1059 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1060                 atomic_add_int(&stcb->asoc.refcnt, 1);
1061                 SCTP_TCB_UNLOCK(stcb);
1062                 SCTP_SOCKET_LOCK(so, 1);
1063                 SCTP_TCB_LOCK(stcb);
1064                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1065                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1066                         /* assoc was freed while we were unlocked */
1067                         SCTP_SOCKET_UNLOCK(so, 1);
1068                         return;
1069                 }
1070 #endif
1071                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
1072 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1073                 SCTP_SOCKET_UNLOCK(so, 1);
1074 #endif
1075         }
1076 #ifdef INVARIANTS
1077         if (!TAILQ_EMPTY(&asoc->send_queue) ||
1078             !TAILQ_EMPTY(&asoc->sent_queue) ||
1079             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
1080                 panic("Queues are not empty when handling SHUTDOWN-ACK");
1081         }
1082 #endif
1083         /* stop the timer */
1084         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net,
1085             SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
1086         /* send SHUTDOWN-COMPLETE */
1087         sctp_send_shutdown_complete(stcb, net, 0);
1088         /* notify upper layer protocol */
1089         if (stcb->sctp_socket) {
1090                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1091                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
1092                         stcb->sctp_socket->so_snd.sb_cc = 0;
1093                 }
1094                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
1095         }
1096         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1097         /* free the TCB but first save off the ep */
1098 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1099         atomic_add_int(&stcb->asoc.refcnt, 1);
1100         SCTP_TCB_UNLOCK(stcb);
1101         SCTP_SOCKET_LOCK(so, 1);
1102         SCTP_TCB_LOCK(stcb);
1103         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1104 #endif
1105         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1106             SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1107 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1108         SCTP_SOCKET_UNLOCK(so, 1);
1109 #endif
1110 }
1111
1112 static void
1113 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type,
1114     struct sctp_nets *net)
1115 {
1116         switch (chunk_type) {
1117         case SCTP_ASCONF_ACK:
1118         case SCTP_ASCONF:
1119                 sctp_asconf_cleanup(stcb, net);
1120                 break;
1121         case SCTP_IFORWARD_CUM_TSN:
1122         case SCTP_FORWARD_CUM_TSN:
1123                 stcb->asoc.prsctp_supported = 0;
1124                 break;
1125         default:
1126                 SCTPDBG(SCTP_DEBUG_INPUT2,
1127                     "Peer does not support chunk type %d (0x%x).\n",
1128                     chunk_type, chunk_type);
1129                 break;
1130         }
1131 }
1132
1133 /*
1134  * Skip past the param header and then we will find the param that caused the
1135  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1136  * these will turn of specific features.
1137  * XXX: Is this the right thing to do?
1138  */
1139 static void
1140 sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type)
1141 {
1142         switch (parameter_type) {
1143                 /* pr-sctp draft */
1144         case SCTP_PRSCTP_SUPPORTED:
1145                 stcb->asoc.prsctp_supported = 0;
1146                 break;
1147         case SCTP_SUPPORTED_CHUNK_EXT:
1148                 break;
1149                 /* draft-ietf-tsvwg-addip-sctp */
1150         case SCTP_HAS_NAT_SUPPORT:
1151                 stcb->asoc.peer_supports_nat = 0;
1152                 break;
1153         case SCTP_ADD_IP_ADDRESS:
1154         case SCTP_DEL_IP_ADDRESS:
1155         case SCTP_SET_PRIM_ADDR:
1156                 stcb->asoc.asconf_supported = 0;
1157                 break;
1158         case SCTP_SUCCESS_REPORT:
1159         case SCTP_ERROR_CAUSE_IND:
1160                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1161                 SCTPDBG(SCTP_DEBUG_INPUT2,
1162                     "Turning off ASCONF to this strange peer\n");
1163                 stcb->asoc.asconf_supported = 0;
1164                 break;
1165         default:
1166                 SCTPDBG(SCTP_DEBUG_INPUT2,
1167                     "Peer does not support param type %d (0x%x)??\n",
1168                     parameter_type, parameter_type);
1169                 break;
1170         }
1171 }
1172
1173 static int
1174 sctp_handle_error(struct sctp_chunkhdr *ch,
1175     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
1176 {
1177         struct sctp_error_cause *cause;
1178         struct sctp_association *asoc;
1179         uint32_t remaining_length, adjust;
1180         uint16_t code, cause_code, cause_length;
1181 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1182         struct socket *so;
1183 #endif
1184
1185         /* parse through all of the errors and process */
1186         asoc = &stcb->asoc;
1187         cause = (struct sctp_error_cause *)((caddr_t)ch +
1188             sizeof(struct sctp_chunkhdr));
1189         remaining_length = ntohs(ch->chunk_length);
1190         if (remaining_length > limit) {
1191                 remaining_length = limit;
1192         }
1193         if (remaining_length >= sizeof(struct sctp_chunkhdr)) {
1194                 remaining_length -= sizeof(struct sctp_chunkhdr);
1195         } else {
1196                 remaining_length = 0;
1197         }
1198         code = 0;
1199         while (remaining_length >= sizeof(struct sctp_error_cause)) {
1200                 /* Process an Error Cause */
1201                 cause_code = ntohs(cause->code);
1202                 cause_length = ntohs(cause->length);
1203                 if ((cause_length > remaining_length) || (cause_length == 0)) {
1204                         /* Invalid cause length, possibly due to truncation. */
1205                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n",
1206                             remaining_length, cause_length);
1207                         return (0);
1208                 }
1209                 if (code == 0) {
1210                         /* report the first error cause */
1211                         code = cause_code;
1212                 }
1213                 switch (cause_code) {
1214                 case SCTP_CAUSE_INVALID_STREAM:
1215                 case SCTP_CAUSE_MISSING_PARAM:
1216                 case SCTP_CAUSE_INVALID_PARAM:
1217                 case SCTP_CAUSE_NO_USER_DATA:
1218                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n",
1219                             cause_code);
1220                         break;
1221                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1222                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags: %x\n",
1223                             ch->chunk_flags);
1224                         if (sctp_handle_nat_colliding_state(stcb)) {
1225                                 return (0);
1226                         }
1227                         break;
1228                 case SCTP_CAUSE_NAT_MISSING_STATE:
1229                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags: %x\n",
1230                             ch->chunk_flags);
1231                         if (sctp_handle_nat_missing_state(stcb, net)) {
1232                                 return (0);
1233                         }
1234                         break;
1235                 case SCTP_CAUSE_STALE_COOKIE:
1236                         /*
1237                          * We only act if we have echoed a cookie and are
1238                          * waiting.
1239                          */
1240                         if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) &&
1241                             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
1242                                 struct sctp_error_stale_cookie *stale_cookie;
1243
1244                                 stale_cookie = (struct sctp_error_stale_cookie *)cause;
1245                                 asoc->cookie_preserve_req = ntohl(stale_cookie->stale_time);
1246                                 /* Double it to be more robust on RTX */
1247                                 if (asoc->cookie_preserve_req <= UINT32_MAX / 2) {
1248                                         asoc->cookie_preserve_req *= 2;
1249                                 } else {
1250                                         asoc->cookie_preserve_req = UINT32_MAX;
1251                                 }
1252                                 asoc->stale_cookie_count++;
1253                                 if (asoc->stale_cookie_count >
1254                                     asoc->max_init_times) {
1255                                         sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED);
1256                                         /* now free the asoc */
1257 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1258                                         so = SCTP_INP_SO(stcb->sctp_ep);
1259                                         atomic_add_int(&stcb->asoc.refcnt, 1);
1260                                         SCTP_TCB_UNLOCK(stcb);
1261                                         SCTP_SOCKET_LOCK(so, 1);
1262                                         SCTP_TCB_LOCK(stcb);
1263                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1264 #endif
1265                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1266                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1267 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1268                                         SCTP_SOCKET_UNLOCK(so, 1);
1269 #endif
1270                                         return (-1);
1271                                 }
1272                                 /* blast back to INIT state */
1273                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
1274                                 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
1275                                 sctp_stop_all_cookie_timers(stcb);
1276                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1277                         }
1278                         break;
1279                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1280                         /*
1281                          * Nothing we can do here, we don't do hostname
1282                          * addresses so if the peer does not like my IPv6
1283                          * (or IPv4 for that matter) it does not matter. If
1284                          * they don't support that type of address, they can
1285                          * NOT possibly get that packet type... i.e. with no
1286                          * IPv6 you can't receive a IPv6 packet. so we can
1287                          * safely ignore this one. If we ever added support
1288                          * for HOSTNAME Addresses, then we would need to do
1289                          * something here.
1290                          */
1291                         break;
1292                 case SCTP_CAUSE_UNRECOG_CHUNK:
1293                         if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) {
1294                                 struct sctp_error_unrecognized_chunk *unrec_chunk;
1295
1296                                 unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause;
1297                                 sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type, net);
1298                         }
1299                         break;
1300                 case SCTP_CAUSE_UNRECOG_PARAM:
1301                         /* XXX: We only consider the first parameter */
1302                         if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) {
1303                                 struct sctp_paramhdr *unrec_parameter;
1304
1305                                 unrec_parameter = (struct sctp_paramhdr *)(cause + 1);
1306                                 sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type));
1307                         }
1308                         break;
1309                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1310                         /*
1311                          * We ignore this since the timer will drive out a
1312                          * new cookie anyway and there timer will drive us
1313                          * to send a SHUTDOWN_COMPLETE. We can't send one
1314                          * here since we don't have their tag.
1315                          */
1316                         break;
1317                 case SCTP_CAUSE_DELETING_LAST_ADDR:
1318                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1319                 case SCTP_CAUSE_DELETING_SRC_ADDR:
1320                         /*
1321                          * We should NOT get these here, but in a
1322                          * ASCONF-ACK.
1323                          */
1324                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n",
1325                             cause_code);
1326                         break;
1327                 case SCTP_CAUSE_OUT_OF_RESC:
1328                         /*
1329                          * And what, pray tell do we do with the fact that
1330                          * the peer is out of resources? Not really sure we
1331                          * could do anything but abort. I suspect this
1332                          * should have came WITH an abort instead of in a
1333                          * OP-ERROR.
1334                          */
1335                         break;
1336                 default:
1337                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n",
1338                             cause_code);
1339                         break;
1340                 }
1341                 adjust = SCTP_SIZE32(cause_length);
1342                 if (remaining_length >= adjust) {
1343                         remaining_length -= adjust;
1344                 } else {
1345                         remaining_length = 0;
1346                 }
1347                 cause = (struct sctp_error_cause *)((caddr_t)cause + adjust);
1348         }
1349         sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED);
1350         return (0);
1351 }
1352
1353 static int
1354 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1355     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
1356     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1357     struct sctp_nets *net, int *abort_no_unlock,
1358     uint8_t mflowtype, uint32_t mflowid,
1359     uint32_t vrf_id)
1360 {
1361         struct sctp_init_ack *init_ack;
1362         struct mbuf *op_err;
1363
1364         SCTPDBG(SCTP_DEBUG_INPUT2,
1365             "sctp_handle_init_ack: handling INIT-ACK\n");
1366
1367         if (stcb == NULL) {
1368                 SCTPDBG(SCTP_DEBUG_INPUT2,
1369                     "sctp_handle_init_ack: TCB is null\n");
1370                 return (-1);
1371         }
1372         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1373                 /* Invalid length */
1374                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1375                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1376                     src, dst, sh, op_err,
1377                     mflowtype, mflowid,
1378                     vrf_id, net->port);
1379                 *abort_no_unlock = 1;
1380                 return (-1);
1381         }
1382         init_ack = &cp->init;
1383         /* validate parameters */
1384         if (init_ack->initiate_tag == 0) {
1385                 /* protocol error... send an abort */
1386                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1387                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1388                     src, dst, sh, op_err,
1389                     mflowtype, mflowid,
1390                     vrf_id, net->port);
1391                 *abort_no_unlock = 1;
1392                 return (-1);
1393         }
1394         if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1395                 /* protocol error... send an abort */
1396                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1397                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1398                     src, dst, sh, op_err,
1399                     mflowtype, mflowid,
1400                     vrf_id, net->port);
1401                 *abort_no_unlock = 1;
1402                 return (-1);
1403         }
1404         if (init_ack->num_inbound_streams == 0) {
1405                 /* protocol error... send an abort */
1406                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1407                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1408                     src, dst, sh, op_err,
1409                     mflowtype, mflowid,
1410                     vrf_id, net->port);
1411                 *abort_no_unlock = 1;
1412                 return (-1);
1413         }
1414         if (init_ack->num_outbound_streams == 0) {
1415                 /* protocol error... send an abort */
1416                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1417                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1418                     src, dst, sh, op_err,
1419                     mflowtype, mflowid,
1420                     vrf_id, net->port);
1421                 *abort_no_unlock = 1;
1422                 return (-1);
1423         }
1424         /* process according to association state... */
1425         switch (SCTP_GET_STATE(stcb)) {
1426         case SCTP_STATE_COOKIE_WAIT:
1427                 /* this is the expected state for this chunk */
1428                 /* process the INIT-ACK parameters */
1429                 if (stcb->asoc.primary_destination->dest_state &
1430                     SCTP_ADDR_UNCONFIRMED) {
1431                         /*
1432                          * The primary is where we sent the INIT, we can
1433                          * always consider it confirmed when the INIT-ACK is
1434                          * returned. Do this before we load addresses
1435                          * though.
1436                          */
1437                         stcb->asoc.primary_destination->dest_state &=
1438                             ~SCTP_ADDR_UNCONFIRMED;
1439                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1440                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1441                 }
1442                 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
1443                     net, abort_no_unlock,
1444                     mflowtype, mflowid,
1445                     vrf_id) < 0) {
1446                         /* error in parsing parameters */
1447                         return (-1);
1448                 }
1449                 /* update our state */
1450                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1451                 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_ECHOED);
1452
1453                 /* reset the RTO calc */
1454                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1455                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1456                             stcb->asoc.overall_error_count,
1457                             0,
1458                             SCTP_FROM_SCTP_INPUT,
1459                             __LINE__);
1460                 }
1461                 stcb->asoc.overall_error_count = 0;
1462                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1463                 /*
1464                  * collapse the init timer back in case of a exponential
1465                  * backoff
1466                  */
1467                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1468                     stcb, net);
1469                 /*
1470                  * the send at the end of the inbound data processing will
1471                  * cause the cookie to be sent
1472                  */
1473                 break;
1474         case SCTP_STATE_SHUTDOWN_SENT:
1475                 /* incorrect state... discard */
1476                 break;
1477         case SCTP_STATE_COOKIE_ECHOED:
1478                 /* incorrect state... discard */
1479                 break;
1480         case SCTP_STATE_OPEN:
1481                 /* incorrect state... discard */
1482                 break;
1483         case SCTP_STATE_EMPTY:
1484         case SCTP_STATE_INUSE:
1485         default:
1486                 /* incorrect state... discard */
1487                 return (-1);
1488                 break;
1489         }
1490         SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1491         return (0);
1492 }
1493
1494 static struct sctp_tcb *
1495 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1496     struct sockaddr *src, struct sockaddr *dst,
1497     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1498     struct sctp_inpcb *inp, struct sctp_nets **netp,
1499     struct sockaddr *init_src, int *notification,
1500     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1501     uint8_t mflowtype, uint32_t mflowid,
1502     uint32_t vrf_id, uint16_t port);
1503
1504
1505 /*
1506  * handle a state cookie for an existing association m: input packet mbuf
1507  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1508  * "split" mbuf and the cookie signature does not exist offset: offset into
1509  * mbuf to the cookie-echo chunk
1510  */
1511 static struct sctp_tcb *
1512 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1513     struct sockaddr *src, struct sockaddr *dst,
1514     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1515     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1516     struct sockaddr *init_src, int *notification,
1517     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1518     uint8_t mflowtype, uint32_t mflowid,
1519     uint32_t vrf_id, uint16_t port)
1520 {
1521         struct sctp_association *asoc;
1522         struct sctp_init_chunk *init_cp, init_buf;
1523         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1524         struct sctp_nets *net;
1525         struct mbuf *op_err;
1526         struct timeval old;
1527         int init_offset, initack_offset, i;
1528         int retval;
1529         int spec_flag = 0;
1530         uint32_t how_indx;
1531 #if defined(SCTP_DETAILED_STR_STATS)
1532         int j;
1533 #endif
1534
1535         net = *netp;
1536         /* I know that the TCB is non-NULL from the caller */
1537         asoc = &stcb->asoc;
1538         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1539                 if (asoc->cookie_how[how_indx] == 0)
1540                         break;
1541         }
1542         if (how_indx < sizeof(asoc->cookie_how)) {
1543                 asoc->cookie_how[how_indx] = 1;
1544         }
1545         if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1546                 /* SHUTDOWN came in after sending INIT-ACK */
1547                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1548                 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, "");
1549                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
1550                     mflowtype, mflowid, inp->fibnum,
1551                     vrf_id, net->port);
1552                 if (how_indx < sizeof(asoc->cookie_how))
1553                         asoc->cookie_how[how_indx] = 2;
1554                 return (NULL);
1555         }
1556         /*
1557          * find and validate the INIT chunk in the cookie (peer's info) the
1558          * INIT should start after the cookie-echo header struct (chunk
1559          * header, state cookie header struct)
1560          */
1561         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1562
1563         init_cp = (struct sctp_init_chunk *)
1564             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1565             (uint8_t *)&init_buf);
1566         if (init_cp == NULL) {
1567                 /* could not pull a INIT chunk in cookie */
1568                 return (NULL);
1569         }
1570         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1571                 return (NULL);
1572         }
1573         /*
1574          * find and validate the INIT-ACK chunk in the cookie (my info) the
1575          * INIT-ACK follows the INIT chunk
1576          */
1577         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1578         initack_cp = (struct sctp_init_ack_chunk *)
1579             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1580             (uint8_t *)&initack_buf);
1581         if (initack_cp == NULL) {
1582                 /* could not pull INIT-ACK chunk in cookie */
1583                 return (NULL);
1584         }
1585         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1586                 return (NULL);
1587         }
1588         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1589             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1590                 /*
1591                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
1592                  * to get into the OPEN state
1593                  */
1594                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1595                         /*-
1596                          * Opps, this means that we somehow generated two vtag's
1597                          * the same. I.e. we did:
1598                          *  Us               Peer
1599                          *   <---INIT(tag=a)------
1600                          *   ----INIT-ACK(tag=t)-->
1601                          *   ----INIT(tag=t)------> *1
1602                          *   <---INIT-ACK(tag=a)---
1603                          *   <----CE(tag=t)------------- *2
1604                          *
1605                          * At point *1 we should be generating a different
1606                          * tag t'. Which means we would throw away the CE and send
1607                          * ours instead. Basically this is case C (throw away side).
1608                          */
1609                         if (how_indx < sizeof(asoc->cookie_how))
1610                                 asoc->cookie_how[how_indx] = 17;
1611                         return (NULL);
1612
1613                 }
1614                 switch (SCTP_GET_STATE(stcb)) {
1615                 case SCTP_STATE_COOKIE_WAIT:
1616                 case SCTP_STATE_COOKIE_ECHOED:
1617                         /*
1618                          * INIT was sent but got a COOKIE_ECHO with the
1619                          * correct tags... just accept it...but we must
1620                          * process the init so that we can make sure we have
1621                          * the right seq no's.
1622                          */
1623                         /* First we must process the INIT !! */
1624                         retval = sctp_process_init(init_cp, stcb);
1625                         if (retval < 0) {
1626                                 if (how_indx < sizeof(asoc->cookie_how))
1627                                         asoc->cookie_how[how_indx] = 3;
1628                                 return (NULL);
1629                         }
1630                         /* we have already processed the INIT so no problem */
1631                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp,
1632                             stcb, net,
1633                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1634                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp,
1635                             stcb, net,
1636                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1637                         /* update current state */
1638                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)
1639                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1640                         else
1641                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1642
1643                         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1644                         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1645                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1646                                     stcb->sctp_ep, stcb, asoc->primary_destination);
1647                         }
1648                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1649                         sctp_stop_all_cookie_timers(stcb);
1650                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1651                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1652                             (!SCTP_IS_LISTENING(inp))) {
1653 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1654                                 struct socket *so;
1655 #endif
1656                                 /*
1657                                  * Here is where collision would go if we
1658                                  * did a connect() and instead got a
1659                                  * init/init-ack/cookie done before the
1660                                  * init-ack came back..
1661                                  */
1662                                 stcb->sctp_ep->sctp_flags |=
1663                                     SCTP_PCB_FLAGS_CONNECTED;
1664 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1665                                 so = SCTP_INP_SO(stcb->sctp_ep);
1666                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1667                                 SCTP_TCB_UNLOCK(stcb);
1668                                 SCTP_SOCKET_LOCK(so, 1);
1669                                 SCTP_TCB_LOCK(stcb);
1670                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1671                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1672                                         SCTP_SOCKET_UNLOCK(so, 1);
1673                                         return (NULL);
1674                                 }
1675 #endif
1676                                 soisconnected(stcb->sctp_socket);
1677 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1678                                 SCTP_SOCKET_UNLOCK(so, 1);
1679 #endif
1680                         }
1681                         /* notify upper layer */
1682                         *notification = SCTP_NOTIFY_ASSOC_UP;
1683                         /*
1684                          * since we did not send a HB make sure we don't
1685                          * double things
1686                          */
1687                         old.tv_sec = cookie->time_entered.tv_sec;
1688                         old.tv_usec = cookie->time_entered.tv_usec;
1689                         net->hb_responded = 1;
1690                         sctp_calculate_rto(stcb, asoc, net, &old,
1691                             SCTP_RTT_FROM_NON_DATA);
1692
1693                         if (stcb->asoc.sctp_autoclose_ticks &&
1694                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1695                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1696                                     inp, stcb, NULL);
1697                         }
1698                         break;
1699                 default:
1700                         /*
1701                          * we're in the OPEN state (or beyond), so peer must
1702                          * have simply lost the COOKIE-ACK
1703                          */
1704                         break;
1705                 }               /* end switch */
1706                 sctp_stop_all_cookie_timers(stcb);
1707                 /*
1708                  * We ignore the return code here.. not sure if we should
1709                  * somehow abort.. but we do have an existing asoc. This
1710                  * really should not fail.
1711                  */
1712                 if (sctp_load_addresses_from_init(stcb, m,
1713                     init_offset + sizeof(struct sctp_init_chunk),
1714                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
1715                         if (how_indx < sizeof(asoc->cookie_how))
1716                                 asoc->cookie_how[how_indx] = 4;
1717                         return (NULL);
1718                 }
1719                 /* respond with a COOKIE-ACK */
1720                 sctp_toss_old_cookies(stcb, asoc);
1721                 sctp_send_cookie_ack(stcb);
1722                 if (how_indx < sizeof(asoc->cookie_how))
1723                         asoc->cookie_how[how_indx] = 5;
1724                 return (stcb);
1725         }
1726
1727         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1728             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1729             cookie->tie_tag_my_vtag == 0 &&
1730             cookie->tie_tag_peer_vtag == 0) {
1731                 /*
1732                  * case C in Section 5.2.4 Table 2: XMOO silently discard
1733                  */
1734                 if (how_indx < sizeof(asoc->cookie_how))
1735                         asoc->cookie_how[how_indx] = 6;
1736                 return (NULL);
1737         }
1738         /*
1739          * If nat support, and the below and stcb is established, send back
1740          * a ABORT(colliding state) if we are established.
1741          */
1742         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) &&
1743             (asoc->peer_supports_nat) &&
1744             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1745             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1746             (asoc->peer_vtag == 0)))) {
1747                 /*
1748                  * Special case - Peer's support nat. We may have two init's
1749                  * that we gave out the same tag on since one was not
1750                  * established.. i.e. we get INIT from host-1 behind the nat
1751                  * and we respond tag-a, we get a INIT from host-2 behind
1752                  * the nat and we get tag-a again. Then we bring up host-1
1753                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1754                  * Now we have colliding state. We must send an abort here
1755                  * with colliding state indication.
1756                  */
1757                 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, "");
1758                 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
1759                     mflowtype, mflowid, inp->fibnum,
1760                     vrf_id, port);
1761                 return (NULL);
1762         }
1763         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1764             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1765             (asoc->peer_vtag == 0))) {
1766                 /*
1767                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1768                  * should be ok, re-accept peer info
1769                  */
1770                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1771                         /*
1772                          * Extension of case C. If we hit this, then the
1773                          * random number generator returned the same vtag
1774                          * when we first sent our INIT-ACK and when we later
1775                          * sent our INIT. The side with the seq numbers that
1776                          * are different will be the one that normnally
1777                          * would have hit case C. This in effect "extends"
1778                          * our vtags in this collision case to be 64 bits.
1779                          * The same collision could occur aka you get both
1780                          * vtag and seq number the same twice in a row.. but
1781                          * is much less likely. If it did happen then we
1782                          * would proceed through and bring up the assoc.. we
1783                          * may end up with the wrong stream setup however..
1784                          * which would be bad.. but there is no way to
1785                          * tell.. until we send on a stream that does not
1786                          * exist :-)
1787                          */
1788                         if (how_indx < sizeof(asoc->cookie_how))
1789                                 asoc->cookie_how[how_indx] = 7;
1790
1791                         return (NULL);
1792                 }
1793                 if (how_indx < sizeof(asoc->cookie_how))
1794                         asoc->cookie_how[how_indx] = 8;
1795                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1796                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1797                 sctp_stop_all_cookie_timers(stcb);
1798                 /*
1799                  * since we did not send a HB make sure we don't double
1800                  * things
1801                  */
1802                 net->hb_responded = 1;
1803                 if (stcb->asoc.sctp_autoclose_ticks &&
1804                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1805                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1806                             NULL);
1807                 }
1808                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1809                 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1810
1811                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1812                         /*
1813                          * Ok the peer probably discarded our data (if we
1814                          * echoed a cookie+data). So anything on the
1815                          * sent_queue should be marked for retransmit, we
1816                          * may not get something to kick us so it COULD
1817                          * still take a timeout to move these.. but it can't
1818                          * hurt to mark them.
1819                          */
1820                         struct sctp_tmit_chunk *chk;
1821
1822                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1823                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1824                                         chk->sent = SCTP_DATAGRAM_RESEND;
1825                                         sctp_flight_size_decrease(chk);
1826                                         sctp_total_flight_decrease(stcb, chk);
1827                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1828                                         spec_flag++;
1829                                 }
1830                         }
1831
1832                 }
1833                 /* process the INIT info (peer's info) */
1834                 retval = sctp_process_init(init_cp, stcb);
1835                 if (retval < 0) {
1836                         if (how_indx < sizeof(asoc->cookie_how))
1837                                 asoc->cookie_how[how_indx] = 9;
1838                         return (NULL);
1839                 }
1840                 if (sctp_load_addresses_from_init(stcb, m,
1841                     init_offset + sizeof(struct sctp_init_chunk),
1842                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
1843                         if (how_indx < sizeof(asoc->cookie_how))
1844                                 asoc->cookie_how[how_indx] = 10;
1845                         return (NULL);
1846                 }
1847                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
1848                     (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
1849                         *notification = SCTP_NOTIFY_ASSOC_UP;
1850
1851                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1852                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1853                             (!SCTP_IS_LISTENING(inp))) {
1854 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1855                                 struct socket *so;
1856 #endif
1857                                 stcb->sctp_ep->sctp_flags |=
1858                                     SCTP_PCB_FLAGS_CONNECTED;
1859 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1860                                 so = SCTP_INP_SO(stcb->sctp_ep);
1861                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1862                                 SCTP_TCB_UNLOCK(stcb);
1863                                 SCTP_SOCKET_LOCK(so, 1);
1864                                 SCTP_TCB_LOCK(stcb);
1865                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1866                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1867                                         SCTP_SOCKET_UNLOCK(so, 1);
1868                                         return (NULL);
1869                                 }
1870 #endif
1871                                 soisconnected(stcb->sctp_socket);
1872 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1873                                 SCTP_SOCKET_UNLOCK(so, 1);
1874 #endif
1875                         }
1876                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)
1877                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1878                         else
1879                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1880                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1881                 } else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
1882                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1883                 } else {
1884                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1885                 }
1886                 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1887                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1888                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1889                             stcb->sctp_ep, stcb, asoc->primary_destination);
1890                 }
1891                 sctp_stop_all_cookie_timers(stcb);
1892                 sctp_toss_old_cookies(stcb, asoc);
1893                 sctp_send_cookie_ack(stcb);
1894                 if (spec_flag) {
1895                         /*
1896                          * only if we have retrans set do we do this. What
1897                          * this call does is get only the COOKIE-ACK out and
1898                          * then when we return the normal call to
1899                          * sctp_chunk_output will get the retrans out behind
1900                          * this.
1901                          */
1902                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1903                 }
1904                 if (how_indx < sizeof(asoc->cookie_how))
1905                         asoc->cookie_how[how_indx] = 11;
1906
1907                 return (stcb);
1908         }
1909         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1910             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1911             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1912             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1913             cookie->tie_tag_peer_vtag != 0) {
1914                 struct sctpasochead *head;
1915 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1916                 struct socket *so;
1917 #endif
1918
1919                 if (asoc->peer_supports_nat) {
1920                         /*
1921                          * This is a gross gross hack. Just call the
1922                          * cookie_new code since we are allowing a duplicate
1923                          * association. I hope this works...
1924                          */
1925                         return (sctp_process_cookie_new(m, iphlen, offset, src, dst,
1926                             sh, cookie, cookie_len,
1927                             inp, netp, init_src, notification,
1928                             auth_skipped, auth_offset, auth_len,
1929                             mflowtype, mflowid,
1930                             vrf_id, port));
1931                 }
1932                 /*
1933                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1934                  */
1935                 /* temp code */
1936                 if (how_indx < sizeof(asoc->cookie_how))
1937                         asoc->cookie_how[how_indx] = 12;
1938                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net,
1939                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1940                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1941                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
1942
1943                 /* notify upper layer */
1944                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1945                 atomic_add_int(&stcb->asoc.refcnt, 1);
1946                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) &&
1947                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1948                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) {
1949                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1950                 }
1951                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
1952                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1953                 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
1954                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1955                 }
1956                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1957                         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1958                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1959                             stcb->sctp_ep, stcb, asoc->primary_destination);
1960
1961                 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
1962                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1963                         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1964                 }
1965                 asoc->pre_open_streams =
1966                     ntohs(initack_cp->init.num_outbound_streams);
1967                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1968                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1969                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1970
1971                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1972
1973                 asoc->str_reset_seq_in = asoc->init_seq_number;
1974
1975                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1976                 if (asoc->mapping_array) {
1977                         memset(asoc->mapping_array, 0,
1978                             asoc->mapping_array_size);
1979                 }
1980                 if (asoc->nr_mapping_array) {
1981                         memset(asoc->nr_mapping_array, 0,
1982                             asoc->mapping_array_size);
1983                 }
1984                 SCTP_TCB_UNLOCK(stcb);
1985 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1986                 so = SCTP_INP_SO(stcb->sctp_ep);
1987                 SCTP_SOCKET_LOCK(so, 1);
1988 #endif
1989                 SCTP_INP_INFO_WLOCK();
1990                 SCTP_INP_WLOCK(stcb->sctp_ep);
1991                 SCTP_TCB_LOCK(stcb);
1992                 atomic_add_int(&stcb->asoc.refcnt, -1);
1993                 /* send up all the data */
1994                 SCTP_TCB_SEND_LOCK(stcb);
1995
1996                 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED);
1997                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1998                         stcb->asoc.strmout[i].chunks_on_queues = 0;
1999 #if defined(SCTP_DETAILED_STR_STATS)
2000                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
2001                                 asoc->strmout[i].abandoned_sent[j] = 0;
2002                                 asoc->strmout[i].abandoned_unsent[j] = 0;
2003                         }
2004 #else
2005                         asoc->strmout[i].abandoned_sent[0] = 0;
2006                         asoc->strmout[i].abandoned_unsent[0] = 0;
2007 #endif
2008                         stcb->asoc.strmout[i].sid = i;
2009                         stcb->asoc.strmout[i].next_mid_ordered = 0;
2010                         stcb->asoc.strmout[i].next_mid_unordered = 0;
2011                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
2012                 }
2013                 /* process the INIT-ACK info (my info) */
2014                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2015                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2016
2017                 /* pull from vtag hash */
2018                 LIST_REMOVE(stcb, sctp_asocs);
2019                 /* re-insert to new vtag position */
2020                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
2021                     SCTP_BASE_INFO(hashasocmark))];
2022                 /*
2023                  * put it in the bucket in the vtag hash of assoc's for the
2024                  * system
2025                  */
2026                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
2027
2028                 SCTP_TCB_SEND_UNLOCK(stcb);
2029                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
2030                 SCTP_INP_INFO_WUNLOCK();
2031 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2032                 SCTP_SOCKET_UNLOCK(so, 1);
2033 #endif
2034                 asoc->total_flight = 0;
2035                 asoc->total_flight_count = 0;
2036                 /* process the INIT info (peer's info) */
2037                 retval = sctp_process_init(init_cp, stcb);
2038                 if (retval < 0) {
2039                         if (how_indx < sizeof(asoc->cookie_how))
2040                                 asoc->cookie_how[how_indx] = 13;
2041
2042                         return (NULL);
2043                 }
2044                 /*
2045                  * since we did not send a HB make sure we don't double
2046                  * things
2047                  */
2048                 net->hb_responded = 1;
2049
2050                 if (sctp_load_addresses_from_init(stcb, m,
2051                     init_offset + sizeof(struct sctp_init_chunk),
2052                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
2053                         if (how_indx < sizeof(asoc->cookie_how))
2054                                 asoc->cookie_how[how_indx] = 14;
2055
2056                         return (NULL);
2057                 }
2058                 /* respond with a COOKIE-ACK */
2059                 sctp_stop_all_cookie_timers(stcb);
2060                 sctp_toss_old_cookies(stcb, asoc);
2061                 sctp_send_cookie_ack(stcb);
2062                 if (how_indx < sizeof(asoc->cookie_how))
2063                         asoc->cookie_how[how_indx] = 15;
2064
2065                 return (stcb);
2066         }
2067         if (how_indx < sizeof(asoc->cookie_how))
2068                 asoc->cookie_how[how_indx] = 16;
2069         /* all other cases... */
2070         return (NULL);
2071 }
2072
2073
2074 /*
2075  * handle a state cookie for a new association m: input packet mbuf chain--
2076  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
2077  * and the cookie signature does not exist offset: offset into mbuf to the
2078  * cookie-echo chunk length: length of the cookie chunk to: where the init
2079  * was from returns a new TCB
2080  */
2081 static struct sctp_tcb *
2082 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
2083     struct sockaddr *src, struct sockaddr *dst,
2084     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
2085     struct sctp_inpcb *inp, struct sctp_nets **netp,
2086     struct sockaddr *init_src, int *notification,
2087     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2088     uint8_t mflowtype, uint32_t mflowid,
2089     uint32_t vrf_id, uint16_t port)
2090 {
2091         struct sctp_tcb *stcb;
2092         struct sctp_init_chunk *init_cp, init_buf;
2093         struct sctp_init_ack_chunk *initack_cp, initack_buf;
2094         union sctp_sockstore store;
2095         struct sctp_association *asoc;
2096         int init_offset, initack_offset, initack_limit;
2097         int retval;
2098         int error = 0;
2099         uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
2100 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2101         struct socket *so;
2102
2103         so = SCTP_INP_SO(inp);
2104 #endif
2105
2106         /*
2107          * find and validate the INIT chunk in the cookie (peer's info) the
2108          * INIT should start after the cookie-echo header struct (chunk
2109          * header, state cookie header struct)
2110          */
2111         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
2112         init_cp = (struct sctp_init_chunk *)
2113             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
2114             (uint8_t *)&init_buf);
2115         if (init_cp == NULL) {
2116                 /* could not pull a INIT chunk in cookie */
2117                 SCTPDBG(SCTP_DEBUG_INPUT1,
2118                     "process_cookie_new: could not pull INIT chunk hdr\n");
2119                 return (NULL);
2120         }
2121         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
2122                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
2123                 return (NULL);
2124         }
2125         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
2126         /*
2127          * find and validate the INIT-ACK chunk in the cookie (my info) the
2128          * INIT-ACK follows the INIT chunk
2129          */
2130         initack_cp = (struct sctp_init_ack_chunk *)
2131             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
2132             (uint8_t *)&initack_buf);
2133         if (initack_cp == NULL) {
2134                 /* could not pull INIT-ACK chunk in cookie */
2135                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2136                 return (NULL);
2137         }
2138         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2139                 return (NULL);
2140         }
2141         /*
2142          * NOTE: We can't use the INIT_ACK's chk_length to determine the
2143          * "initack_limit" value.  This is because the chk_length field
2144          * includes the length of the cookie, but the cookie is omitted when
2145          * the INIT and INIT_ACK are tacked onto the cookie...
2146          */
2147         initack_limit = offset + cookie_len;
2148
2149         /*
2150          * now that we know the INIT/INIT-ACK are in place, create a new TCB
2151          * and popluate
2152          */
2153
2154         /*
2155          * Here we do a trick, we set in NULL for the proc/thread argument.
2156          * We do this since in effect we only use the p argument when the
2157          * socket is unbound and we must do an implicit bind. Since we are
2158          * getting a cookie, we cannot be unbound.
2159          */
2160         stcb = sctp_aloc_assoc(inp, init_src, &error,
2161             ntohl(initack_cp->init.initiate_tag), vrf_id,
2162             ntohs(initack_cp->init.num_outbound_streams),
2163             port,
2164             (struct thread *)NULL,
2165             SCTP_DONT_INITIALIZE_AUTH_PARAMS);
2166         if (stcb == NULL) {
2167                 struct mbuf *op_err;
2168
2169                 /* memory problem? */
2170                 SCTPDBG(SCTP_DEBUG_INPUT1,
2171                     "process_cookie_new: no room for another TCB!\n");
2172                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2173                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2174                     src, dst, sh, op_err,
2175                     mflowtype, mflowid,
2176                     vrf_id, port);
2177                 return (NULL);
2178         }
2179         /* get the correct sctp_nets */
2180         if (netp)
2181                 *netp = sctp_findnet(stcb, init_src);
2182
2183         asoc = &stcb->asoc;
2184         /* get scope variables out of cookie */
2185         asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
2186         asoc->scope.site_scope = cookie->site_scope;
2187         asoc->scope.local_scope = cookie->local_scope;
2188         asoc->scope.loopback_scope = cookie->loopback_scope;
2189
2190         if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2191             (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2192                 struct mbuf *op_err;
2193
2194                 /*
2195                  * Houston we have a problem. The EP changed while the
2196                  * cookie was in flight. Only recourse is to abort the
2197                  * association.
2198                  */
2199                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2200                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2201                     src, dst, sh, op_err,
2202                     mflowtype, mflowid,
2203                     vrf_id, port);
2204 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2205                 atomic_add_int(&stcb->asoc.refcnt, 1);
2206                 SCTP_TCB_UNLOCK(stcb);
2207                 SCTP_SOCKET_LOCK(so, 1);
2208                 SCTP_TCB_LOCK(stcb);
2209                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2210 #endif
2211                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2212                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2213 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2214                 SCTP_SOCKET_UNLOCK(so, 1);
2215 #endif
2216                 return (NULL);
2217         }
2218         /* process the INIT-ACK info (my info) */
2219         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2220         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2221         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2222         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2223         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2224         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2225         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2226         asoc->str_reset_seq_in = asoc->init_seq_number;
2227
2228         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2229
2230         /* process the INIT info (peer's info) */
2231         if (netp)
2232                 retval = sctp_process_init(init_cp, stcb);
2233         else
2234                 retval = 0;
2235         if (retval < 0) {
2236 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2237                 atomic_add_int(&stcb->asoc.refcnt, 1);
2238                 SCTP_TCB_UNLOCK(stcb);
2239                 SCTP_SOCKET_LOCK(so, 1);
2240                 SCTP_TCB_LOCK(stcb);
2241                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2242 #endif
2243                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2244                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2245 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2246                 SCTP_SOCKET_UNLOCK(so, 1);
2247 #endif
2248                 return (NULL);
2249         }
2250         /* load all addresses */
2251         if (sctp_load_addresses_from_init(stcb, m,
2252             init_offset + sizeof(struct sctp_init_chunk), initack_offset,
2253             src, dst, init_src, port)) {
2254 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2255                 atomic_add_int(&stcb->asoc.refcnt, 1);
2256                 SCTP_TCB_UNLOCK(stcb);
2257                 SCTP_SOCKET_LOCK(so, 1);
2258                 SCTP_TCB_LOCK(stcb);
2259                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2260 #endif
2261                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2262                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2263 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2264                 SCTP_SOCKET_UNLOCK(so, 1);
2265 #endif
2266                 return (NULL);
2267         }
2268         /*
2269          * verify any preceding AUTH chunk that was skipped
2270          */
2271         /* pull the local authentication parameters from the cookie/init-ack */
2272         sctp_auth_get_cookie_params(stcb, m,
2273             initack_offset + sizeof(struct sctp_init_ack_chunk),
2274             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2275         if (auth_skipped) {
2276                 struct sctp_auth_chunk *auth;
2277
2278                 auth = (struct sctp_auth_chunk *)
2279                     sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2280                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2281                         /* auth HMAC failed, dump the assoc and packet */
2282                         SCTPDBG(SCTP_DEBUG_AUTH1,
2283                             "COOKIE-ECHO: AUTH failed\n");
2284 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2285                         atomic_add_int(&stcb->asoc.refcnt, 1);
2286                         SCTP_TCB_UNLOCK(stcb);
2287                         SCTP_SOCKET_LOCK(so, 1);
2288                         SCTP_TCB_LOCK(stcb);
2289                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2290 #endif
2291                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2292                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_21);
2293 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2294                         SCTP_SOCKET_UNLOCK(so, 1);
2295 #endif
2296                         return (NULL);
2297                 } else {
2298                         /* remaining chunks checked... good to go */
2299                         stcb->asoc.authenticated = 1;
2300                 }
2301         }
2302
2303         /*
2304          * if we're doing ASCONFs, check to see if we have any new local
2305          * addresses that need to get added to the peer (eg. addresses
2306          * changed while cookie echo in flight).  This needs to be done
2307          * after we go to the OPEN state to do the correct asconf
2308          * processing. else, make sure we have the correct addresses in our
2309          * lists
2310          */
2311
2312         /* warning, we re-use sin, sin6, sa_store here! */
2313         /* pull in local_address (our "from" address) */
2314         switch (cookie->laddr_type) {
2315 #ifdef INET
2316         case SCTP_IPV4_ADDRESS:
2317                 /* source addr is IPv4 */
2318                 memset(&store.sin, 0, sizeof(struct sockaddr_in));
2319                 store.sin.sin_family = AF_INET;
2320                 store.sin.sin_len = sizeof(struct sockaddr_in);
2321                 store.sin.sin_addr.s_addr = cookie->laddress[0];
2322                 break;
2323 #endif
2324 #ifdef INET6
2325         case SCTP_IPV6_ADDRESS:
2326                 /* source addr is IPv6 */
2327                 memset(&store.sin6, 0, sizeof(struct sockaddr_in6));
2328                 store.sin6.sin6_family = AF_INET6;
2329                 store.sin6.sin6_len = sizeof(struct sockaddr_in6);
2330                 store.sin6.sin6_scope_id = cookie->scope_id;
2331                 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr));
2332                 break;
2333 #endif
2334         default:
2335 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2336                 atomic_add_int(&stcb->asoc.refcnt, 1);
2337                 SCTP_TCB_UNLOCK(stcb);
2338                 SCTP_SOCKET_LOCK(so, 1);
2339                 SCTP_TCB_LOCK(stcb);
2340                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2341 #endif
2342                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2343                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
2344 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2345                 SCTP_SOCKET_UNLOCK(so, 1);
2346 #endif
2347                 return (NULL);
2348         }
2349
2350         /* update current state */
2351         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2352         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
2353         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2354                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2355                     stcb->sctp_ep, stcb, asoc->primary_destination);
2356         }
2357         sctp_stop_all_cookie_timers(stcb);
2358         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2359         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2360
2361         /* set up to notify upper layer */
2362         *notification = SCTP_NOTIFY_ASSOC_UP;
2363         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2364             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2365             (!SCTP_IS_LISTENING(inp))) {
2366                 /*
2367                  * This is an endpoint that called connect() how it got a
2368                  * cookie that is NEW is a bit of a mystery. It must be that
2369                  * the INIT was sent, but before it got there.. a complete
2370                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2371                  * should have went to the other code.. not here.. oh well..
2372                  * a bit of protection is worth having..
2373                  */
2374                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2375 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2376                 atomic_add_int(&stcb->asoc.refcnt, 1);
2377                 SCTP_TCB_UNLOCK(stcb);
2378                 SCTP_SOCKET_LOCK(so, 1);
2379                 SCTP_TCB_LOCK(stcb);
2380                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2381                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2382                         SCTP_SOCKET_UNLOCK(so, 1);
2383                         return (NULL);
2384                 }
2385 #endif
2386                 soisconnected(stcb->sctp_socket);
2387 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2388                 SCTP_SOCKET_UNLOCK(so, 1);
2389 #endif
2390         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2391             (SCTP_IS_LISTENING(inp))) {
2392                 /*
2393                  * We don't want to do anything with this one. Since it is
2394                  * the listening guy. The timer will get started for
2395                  * accepted connections in the caller.
2396                  */
2397                 ;
2398         }
2399         /* since we did not send a HB make sure we don't double things */
2400         if ((netp) && (*netp))
2401                 (*netp)->hb_responded = 1;
2402
2403         if (stcb->asoc.sctp_autoclose_ticks &&
2404             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2405                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2406         }
2407         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2408         if ((netp != NULL) && (*netp != NULL)) {
2409                 struct timeval old;
2410
2411                 /* calculate the RTT and set the encaps port */
2412                 old.tv_sec = cookie->time_entered.tv_sec;
2413                 old.tv_usec = cookie->time_entered.tv_usec;
2414                 sctp_calculate_rto(stcb, asoc, *netp, &old, SCTP_RTT_FROM_NON_DATA);
2415         }
2416         /* respond with a COOKIE-ACK */
2417         sctp_send_cookie_ack(stcb);
2418
2419         /*
2420          * check the address lists for any ASCONFs that need to be sent
2421          * AFTER the cookie-ack is sent
2422          */
2423         sctp_check_address_list(stcb, m,
2424             initack_offset + sizeof(struct sctp_init_ack_chunk),
2425             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2426             &store.sa, cookie->local_scope, cookie->site_scope,
2427             cookie->ipv4_scope, cookie->loopback_scope);
2428
2429
2430         return (stcb);
2431 }
2432
2433 /*
2434  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2435  * we NEED to make sure we are not already using the vtag. If so we
2436  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2437         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2438                                                             SCTP_BASE_INFO(hashasocmark))];
2439         LIST_FOREACH(stcb, head, sctp_asocs) {
2440                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2441                        -- SEND ABORT - TRY AGAIN --
2442                 }
2443         }
2444 */
2445
2446 /*
2447  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2448  * existing (non-NULL) TCB
2449  */
2450 static struct mbuf *
2451 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2452     struct sockaddr *src, struct sockaddr *dst,
2453     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2454     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2455     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2456     struct sctp_tcb **locked_tcb,
2457     uint8_t mflowtype, uint32_t mflowid,
2458     uint32_t vrf_id, uint16_t port)
2459 {
2460         struct sctp_state_cookie *cookie;
2461         struct sctp_tcb *l_stcb = *stcb;
2462         struct sctp_inpcb *l_inp;
2463         struct sockaddr *to;
2464         struct sctp_pcb *ep;
2465         struct mbuf *m_sig;
2466         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2467         uint8_t *sig;
2468         uint8_t cookie_ok = 0;
2469         unsigned int sig_offset, cookie_offset;
2470         unsigned int cookie_len;
2471         struct timeval now;
2472         struct timeval time_expires;
2473         int notification = 0;
2474         struct sctp_nets *netl;
2475         int had_a_existing_tcb = 0;
2476         int send_int_conf = 0;
2477 #ifdef INET
2478         struct sockaddr_in sin;
2479 #endif
2480 #ifdef INET6
2481         struct sockaddr_in6 sin6;
2482 #endif
2483
2484         SCTPDBG(SCTP_DEBUG_INPUT2,
2485             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2486
2487         if (inp_p == NULL) {
2488                 return (NULL);
2489         }
2490         cookie = &cp->cookie;
2491         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2492         cookie_len = ntohs(cp->ch.chunk_length);
2493
2494         if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2495             sizeof(struct sctp_init_chunk) +
2496             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2497                 /* cookie too small */
2498                 return (NULL);
2499         }
2500         if ((cookie->peerport != sh->src_port) ||
2501             (cookie->myport != sh->dest_port) ||
2502             (cookie->my_vtag != sh->v_tag)) {
2503                 /*
2504                  * invalid ports or bad tag.  Note that we always leave the
2505                  * v_tag in the header in network order and when we stored
2506                  * it in the my_vtag slot we also left it in network order.
2507                  * This maintains the match even though it may be in the
2508                  * opposite byte order of the machine :->
2509                  */
2510                 return (NULL);
2511         }
2512         /*
2513          * split off the signature into its own mbuf (since it should not be
2514          * calculated in the sctp_hmac_m() call).
2515          */
2516         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2517         m_sig = m_split(m, sig_offset, M_NOWAIT);
2518         if (m_sig == NULL) {
2519                 /* out of memory or ?? */
2520                 return (NULL);
2521         }
2522 #ifdef SCTP_MBUF_LOGGING
2523         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2524                 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT);
2525         }
2526 #endif
2527
2528         /*
2529          * compute the signature/digest for the cookie
2530          */
2531         ep = &(*inp_p)->sctp_ep;
2532         l_inp = *inp_p;
2533         if (l_stcb) {
2534                 SCTP_TCB_UNLOCK(l_stcb);
2535         }
2536         SCTP_INP_RLOCK(l_inp);
2537         if (l_stcb) {
2538                 SCTP_TCB_LOCK(l_stcb);
2539         }
2540         /* which cookie is it? */
2541         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2542             (ep->current_secret_number != ep->last_secret_number)) {
2543                 /* it's the old cookie */
2544                 (void)sctp_hmac_m(SCTP_HMAC,
2545                     (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2546                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2547         } else {
2548                 /* it's the current cookie */
2549                 (void)sctp_hmac_m(SCTP_HMAC,
2550                     (uint8_t *)ep->secret_key[(int)ep->current_secret_number],
2551                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2552         }
2553         /* get the signature */
2554         SCTP_INP_RUNLOCK(l_inp);
2555         sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig);
2556         if (sig == NULL) {
2557                 /* couldn't find signature */
2558                 sctp_m_freem(m_sig);
2559                 return (NULL);
2560         }
2561         /* compare the received digest with the computed digest */
2562         if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2563                 /* try the old cookie? */
2564                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2565                     (ep->current_secret_number != ep->last_secret_number)) {
2566                         /* compute digest with old */
2567                         (void)sctp_hmac_m(SCTP_HMAC,
2568                             (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2569                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2570                         /* compare */
2571                         if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2572                                 cookie_ok = 1;
2573                 }
2574         } else {
2575                 cookie_ok = 1;
2576         }
2577
2578         /*
2579          * Now before we continue we must reconstruct our mbuf so that
2580          * normal processing of any other chunks will work.
2581          */
2582         {
2583                 struct mbuf *m_at;
2584
2585                 m_at = m;
2586                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2587                         m_at = SCTP_BUF_NEXT(m_at);
2588                 }
2589                 SCTP_BUF_NEXT(m_at) = m_sig;
2590         }
2591
2592         if (cookie_ok == 0) {
2593                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2594                 SCTPDBG(SCTP_DEBUG_INPUT2,
2595                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2596                     (uint32_t)offset, cookie_offset, sig_offset);
2597                 return (NULL);
2598         }
2599
2600         /*
2601          * check the cookie timestamps to be sure it's not stale
2602          */
2603         (void)SCTP_GETTIME_TIMEVAL(&now);
2604         /* Expire time is in Ticks, so we convert to seconds */
2605         time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
2606         time_expires.tv_usec = cookie->time_entered.tv_usec;
2607         if (timevalcmp(&now, &time_expires, >)) {
2608                 /* cookie is stale! */
2609                 struct mbuf *op_err;
2610                 struct sctp_error_stale_cookie *cause;
2611                 struct timeval diff;
2612                 uint32_t staleness;
2613
2614                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie),
2615                     0, M_NOWAIT, 1, MT_DATA);
2616                 if (op_err == NULL) {
2617                         /* FOOBAR */
2618                         return (NULL);
2619                 }
2620                 /* Set the len */
2621                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie);
2622                 cause = mtod(op_err, struct sctp_error_stale_cookie *);
2623                 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE);
2624                 cause->cause.length = htons((sizeof(struct sctp_paramhdr) +
2625                     (sizeof(uint32_t))));
2626                 diff = now;
2627                 timevalsub(&diff, &time_expires);
2628                 if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) {
2629                         staleness = UINT32_MAX;
2630                 } else {
2631                         staleness = diff.tv_sec * 1000000;
2632                 }
2633                 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) {
2634                         staleness += diff.tv_usec;
2635                 } else {
2636                         staleness = UINT32_MAX;
2637                 }
2638                 cause->stale_time = htonl(staleness);
2639                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
2640                     mflowtype, mflowid, l_inp->fibnum,
2641                     vrf_id, port);
2642                 return (NULL);
2643         }
2644         /*
2645          * Now we must see with the lookup address if we have an existing
2646          * asoc. This will only happen if we were in the COOKIE-WAIT state
2647          * and a INIT collided with us and somewhere the peer sent the
2648          * cookie on another address besides the single address our assoc
2649          * had for him. In this case we will have one of the tie-tags set at
2650          * least AND the address field in the cookie can be used to look it
2651          * up.
2652          */
2653         to = NULL;
2654         switch (cookie->addr_type) {
2655 #ifdef INET6
2656         case SCTP_IPV6_ADDRESS:
2657                 memset(&sin6, 0, sizeof(sin6));
2658                 sin6.sin6_family = AF_INET6;
2659                 sin6.sin6_len = sizeof(sin6);
2660                 sin6.sin6_port = sh->src_port;
2661                 sin6.sin6_scope_id = cookie->scope_id;
2662                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2663                     sizeof(sin6.sin6_addr.s6_addr));
2664                 to = (struct sockaddr *)&sin6;
2665                 break;
2666 #endif
2667 #ifdef INET
2668         case SCTP_IPV4_ADDRESS:
2669                 memset(&sin, 0, sizeof(sin));
2670                 sin.sin_family = AF_INET;
2671                 sin.sin_len = sizeof(sin);
2672                 sin.sin_port = sh->src_port;
2673                 sin.sin_addr.s_addr = cookie->address[0];
2674                 to = (struct sockaddr *)&sin;
2675                 break;
2676 #endif
2677         default:
2678                 /* This should not happen */
2679                 return (NULL);
2680         }
2681         if (*stcb == NULL) {
2682                 /* Yep, lets check */
2683                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
2684                 if (*stcb == NULL) {
2685                         /*
2686                          * We should have only got back the same inp. If we
2687                          * got back a different ep we have a problem. The
2688                          * original findep got back l_inp and now
2689                          */
2690                         if (l_inp != *inp_p) {
2691                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2692                         }
2693                 } else {
2694                         if (*locked_tcb == NULL) {
2695                                 /*
2696                                  * In this case we found the assoc only
2697                                  * after we locked the create lock. This
2698                                  * means we are in a colliding case and we
2699                                  * must make sure that we unlock the tcb if
2700                                  * its one of the cases where we throw away
2701                                  * the incoming packets.
2702                                  */
2703                                 *locked_tcb = *stcb;
2704
2705                                 /*
2706                                  * We must also increment the inp ref count
2707                                  * since the ref_count flags was set when we
2708                                  * did not find the TCB, now we found it
2709                                  * which reduces the refcount.. we must
2710                                  * raise it back out to balance it all :-)
2711                                  */
2712                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2713                                 if ((*stcb)->sctp_ep != l_inp) {
2714                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2715                                             (void *)(*stcb)->sctp_ep, (void *)l_inp);
2716                                 }
2717                         }
2718                 }
2719         }
2720
2721         cookie_len -= SCTP_SIGNATURE_SIZE;
2722         if (*stcb == NULL) {
2723                 /* this is the "normal" case... get a new TCB */
2724                 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
2725                     cookie, cookie_len, *inp_p,
2726                     netp, to, &notification,
2727                     auth_skipped, auth_offset, auth_len,
2728                     mflowtype, mflowid,
2729                     vrf_id, port);
2730         } else {
2731                 /* this is abnormal... cookie-echo on existing TCB */
2732                 had_a_existing_tcb = 1;
2733                 *stcb = sctp_process_cookie_existing(m, iphlen, offset,
2734                     src, dst, sh,
2735                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2736                     &notification, auth_skipped, auth_offset, auth_len,
2737                     mflowtype, mflowid,
2738                     vrf_id, port);
2739         }
2740
2741         if (*stcb == NULL) {
2742                 /* still no TCB... must be bad cookie-echo */
2743                 return (NULL);
2744         }
2745         if (*netp != NULL) {
2746                 (*netp)->flowtype = mflowtype;
2747                 (*netp)->flowid = mflowid;
2748         }
2749         /*
2750          * Ok, we built an association so confirm the address we sent the
2751          * INIT-ACK to.
2752          */
2753         netl = sctp_findnet(*stcb, to);
2754         /*
2755          * This code should in theory NOT run but
2756          */
2757         if (netl == NULL) {
2758                 /* TSNH! Huh, why do I need to add this address here? */
2759                 if (sctp_add_remote_addr(*stcb, to, NULL, port,
2760                     SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2761                         return (NULL);
2762                 }
2763                 netl = sctp_findnet(*stcb, to);
2764         }
2765         if (netl) {
2766                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2767                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2768                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2769                             netl);
2770                         send_int_conf = 1;
2771                 }
2772         }
2773         sctp_start_net_timers(*stcb);
2774         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2775                 if (!had_a_existing_tcb ||
2776                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2777                         /*
2778                          * If we have a NEW cookie or the connect never
2779                          * reached the connected state during collision we
2780                          * must do the TCP accept thing.
2781                          */
2782                         struct socket *so, *oso;
2783                         struct sctp_inpcb *inp;
2784
2785                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2786                                 /*
2787                                  * For a restart we will keep the same
2788                                  * socket, no need to do anything. I THINK!!
2789                                  */
2790                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2791                                 if (send_int_conf) {
2792                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2793                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2794                                 }
2795                                 return (m);
2796                         }
2797                         oso = (*inp_p)->sctp_socket;
2798                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2799                         SCTP_TCB_UNLOCK((*stcb));
2800                         CURVNET_SET(oso->so_vnet);
2801                         so = sonewconn(oso, 0
2802                             );
2803                         CURVNET_RESTORE();
2804                         SCTP_TCB_LOCK((*stcb));
2805                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2806
2807                         if (so == NULL) {
2808                                 struct mbuf *op_err;
2809 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2810                                 struct socket *pcb_so;
2811 #endif
2812                                 /* Too many sockets */
2813                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2814                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2815                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2816                                     src, dst, sh, op_err,
2817                                     mflowtype, mflowid,
2818                                     vrf_id, port);
2819 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2820                                 pcb_so = SCTP_INP_SO(*inp_p);
2821                                 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2822                                 SCTP_TCB_UNLOCK((*stcb));
2823                                 SCTP_SOCKET_LOCK(pcb_so, 1);
2824                                 SCTP_TCB_LOCK((*stcb));
2825                                 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2826 #endif
2827                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC,
2828                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
2829 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2830                                 SCTP_SOCKET_UNLOCK(pcb_so, 1);
2831 #endif
2832                                 return (NULL);
2833                         }
2834                         inp = (struct sctp_inpcb *)so->so_pcb;
2835                         SCTP_INP_INCR_REF(inp);
2836                         /*
2837                          * We add the unbound flag here so that if we get an
2838                          * soabort() before we get the move_pcb done, we
2839                          * will properly cleanup.
2840                          */
2841                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2842                             SCTP_PCB_FLAGS_CONNECTED |
2843                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2844                             SCTP_PCB_FLAGS_UNBOUND |
2845                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2846                             SCTP_PCB_FLAGS_DONT_WAKE);
2847                         inp->sctp_features = (*inp_p)->sctp_features;
2848                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2849                         inp->sctp_socket = so;
2850                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2851                         inp->max_cwnd = (*inp_p)->max_cwnd;
2852                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2853                         inp->ecn_supported = (*inp_p)->ecn_supported;
2854                         inp->prsctp_supported = (*inp_p)->prsctp_supported;
2855                         inp->auth_supported = (*inp_p)->auth_supported;
2856                         inp->asconf_supported = (*inp_p)->asconf_supported;
2857                         inp->reconfig_supported = (*inp_p)->reconfig_supported;
2858                         inp->nrsack_supported = (*inp_p)->nrsack_supported;
2859                         inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
2860                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2861                         inp->sctp_context = (*inp_p)->sctp_context;
2862                         inp->local_strreset_support = (*inp_p)->local_strreset_support;
2863                         inp->fibnum = (*inp_p)->fibnum;
2864                         inp->inp_starting_point_for_iterator = NULL;
2865                         /*
2866                          * copy in the authentication parameters from the
2867                          * original endpoint
2868                          */
2869                         if (inp->sctp_ep.local_hmacs)
2870                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2871                         inp->sctp_ep.local_hmacs =
2872                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2873                         if (inp->sctp_ep.local_auth_chunks)
2874                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2875                         inp->sctp_ep.local_auth_chunks =
2876                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2877
2878                         /*
2879                          * Now we must move it from one hash table to
2880                          * another and get the tcb in the right place.
2881                          */
2882
2883                         /*
2884                          * This is where the one-2-one socket is put into
2885                          * the accept state waiting for the accept!
2886                          */
2887                         if (*stcb) {
2888                                 SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE);
2889                         }
2890                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2891
2892                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2893                         SCTP_TCB_UNLOCK((*stcb));
2894
2895                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2896                             0);
2897                         SCTP_TCB_LOCK((*stcb));
2898                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2899
2900
2901                         /*
2902                          * now we must check to see if we were aborted while
2903                          * the move was going on and the lock/unlock
2904                          * happened.
2905                          */
2906                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2907                                 /*
2908                                  * yep it was, we leave the assoc attached
2909                                  * to the socket since the sctp_inpcb_free()
2910                                  * call will send an abort for us.
2911                                  */
2912                                 SCTP_INP_DECR_REF(inp);
2913                                 return (NULL);
2914                         }
2915                         SCTP_INP_DECR_REF(inp);
2916                         /* Switch over to the new guy */
2917                         *inp_p = inp;
2918                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2919                         if (send_int_conf) {
2920                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2921                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2922                         }
2923
2924                         /*
2925                          * Pull it from the incomplete queue and wake the
2926                          * guy
2927                          */
2928 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2929                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2930                         SCTP_TCB_UNLOCK((*stcb));
2931                         SCTP_SOCKET_LOCK(so, 1);
2932 #endif
2933                         soisconnected(so);
2934 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2935                         SCTP_TCB_LOCK((*stcb));
2936                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2937                         SCTP_SOCKET_UNLOCK(so, 1);
2938 #endif
2939                         return (m);
2940                 }
2941         }
2942         if (notification) {
2943                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2944         }
2945         if (send_int_conf) {
2946                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2947                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2948         }
2949         return (m);
2950 }
2951
2952 static void
2953 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2954     struct sctp_tcb *stcb, struct sctp_nets *net)
2955 {
2956         /* cp must not be used, others call this without a c-ack :-) */
2957         struct sctp_association *asoc;
2958
2959         SCTPDBG(SCTP_DEBUG_INPUT2,
2960             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2961         if ((stcb == NULL) || (net == NULL)) {
2962                 return;
2963         }
2964
2965         asoc = &stcb->asoc;
2966         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
2967                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
2968                     asoc->overall_error_count,
2969                     0,
2970                     SCTP_FROM_SCTP_INPUT,
2971                     __LINE__);
2972         }
2973         asoc->overall_error_count = 0;
2974         sctp_stop_all_cookie_timers(stcb);
2975         /* process according to association state */
2976         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) {
2977                 /* state change only needed when I am in right state */
2978                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2979                 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
2980                 sctp_start_net_timers(stcb);
2981                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2982                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2983                             stcb->sctp_ep, stcb, asoc->primary_destination);
2984
2985                 }
2986                 /* update RTO */
2987                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2988                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2989                 if (asoc->overall_error_count == 0) {
2990                         sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered,
2991                             SCTP_RTT_FROM_NON_DATA);
2992                 }
2993                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2994                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2995                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2996                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2997 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2998                         struct socket *so;
2999
3000 #endif
3001                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
3002 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3003                         so = SCTP_INP_SO(stcb->sctp_ep);
3004                         atomic_add_int(&stcb->asoc.refcnt, 1);
3005                         SCTP_TCB_UNLOCK(stcb);
3006                         SCTP_SOCKET_LOCK(so, 1);
3007                         SCTP_TCB_LOCK(stcb);
3008                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3009 #endif
3010                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
3011                                 soisconnected(stcb->sctp_socket);
3012                         }
3013 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3014                         SCTP_SOCKET_UNLOCK(so, 1);
3015 #endif
3016                 }
3017                 /*
3018                  * since we did not send a HB make sure we don't double
3019                  * things
3020                  */
3021                 net->hb_responded = 1;
3022
3023                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
3024                         /*
3025                          * We don't need to do the asconf thing, nor hb or
3026                          * autoclose if the socket is closed.
3027                          */
3028                         goto closed_socket;
3029                 }
3030
3031                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
3032                     stcb, net);
3033
3034
3035                 if (stcb->asoc.sctp_autoclose_ticks &&
3036                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
3037                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
3038                             stcb->sctp_ep, stcb, NULL);
3039                 }
3040                 /*
3041                  * send ASCONF if parameters are pending and ASCONFs are
3042                  * allowed (eg. addresses changed when init/cookie echo were
3043                  * in flight)
3044                  */
3045                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
3046                     (stcb->asoc.asconf_supported == 1) &&
3047                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
3048 #ifdef SCTP_TIMER_BASED_ASCONF
3049                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
3050                             stcb->sctp_ep, stcb,
3051                             stcb->asoc.primary_destination);
3052 #else
3053                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
3054                             SCTP_ADDR_NOT_LOCKED);
3055 #endif
3056                 }
3057         }
3058 closed_socket:
3059         /* Toss the cookie if I can */
3060         sctp_toss_old_cookies(stcb, asoc);
3061         if (!TAILQ_EMPTY(&asoc->sent_queue)) {
3062                 /* Restart the timer if we have pending data */
3063                 struct sctp_tmit_chunk *chk;
3064
3065                 chk = TAILQ_FIRST(&asoc->sent_queue);
3066                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
3067         }
3068 }
3069
3070 static void
3071 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
3072     struct sctp_tcb *stcb)
3073 {
3074         struct sctp_nets *net;
3075         struct sctp_tmit_chunk *lchk;
3076         struct sctp_ecne_chunk bkup;
3077         uint8_t override_bit;
3078         uint32_t tsn, window_data_tsn;
3079         int len;
3080         unsigned int pkt_cnt;
3081
3082         len = ntohs(cp->ch.chunk_length);
3083         if ((len != sizeof(struct sctp_ecne_chunk)) &&
3084             (len != sizeof(struct old_sctp_ecne_chunk))) {
3085                 return;
3086         }
3087         if (len == sizeof(struct old_sctp_ecne_chunk)) {
3088                 /* Its the old format */
3089                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
3090                 bkup.num_pkts_since_cwr = htonl(1);
3091                 cp = &bkup;
3092         }
3093         SCTP_STAT_INCR(sctps_recvecne);
3094         tsn = ntohl(cp->tsn);
3095         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
3096         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
3097         if (lchk == NULL) {
3098                 window_data_tsn = stcb->asoc.sending_seq - 1;
3099         } else {
3100                 window_data_tsn = lchk->rec.data.tsn;
3101         }
3102
3103         /* Find where it was sent to if possible. */
3104         net = NULL;
3105         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
3106                 if (lchk->rec.data.tsn == tsn) {
3107                         net = lchk->whoTo;
3108                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
3109                         break;
3110                 }
3111                 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) {
3112                         break;
3113                 }
3114         }
3115         if (net == NULL) {
3116                 /*
3117                  * What to do. A previous send of a CWR was possibly lost.
3118                  * See how old it is, we may have it marked on the actual
3119                  * net.
3120                  */
3121                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
3122                         if (tsn == net->last_cwr_tsn) {
3123                                 /* Found him, send it off */
3124                                 break;
3125                         }
3126                 }
3127                 if (net == NULL) {
3128                         /*
3129                          * If we reach here, we need to send a special CWR
3130                          * that says hey, we did this a long time ago and
3131                          * you lost the response.
3132                          */
3133                         net = TAILQ_FIRST(&stcb->asoc.nets);
3134                         if (net == NULL) {
3135                                 /* TSNH */
3136                                 return;
3137                         }
3138                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
3139                 } else {
3140                         override_bit = 0;
3141                 }
3142         } else {
3143                 override_bit = 0;
3144         }
3145         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
3146             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3147                 /*
3148                  * JRS - Use the congestion control given in the pluggable
3149                  * CC module
3150                  */
3151                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
3152                 /*
3153                  * We reduce once every RTT. So we will only lower cwnd at
3154                  * the next sending seq i.e. the window_data_tsn
3155                  */
3156                 net->cwr_window_tsn = window_data_tsn;
3157                 net->ecn_ce_pkt_cnt += pkt_cnt;
3158                 net->lost_cnt = pkt_cnt;
3159                 net->last_cwr_tsn = tsn;
3160         } else {
3161                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
3162                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
3163                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3164                         /*
3165                          * Another loss in the same window update how many
3166                          * marks/packets lost we have had.
3167                          */
3168                         int cnt = 1;
3169
3170                         if (pkt_cnt > net->lost_cnt) {
3171                                 /* Should be the case */
3172                                 cnt = (pkt_cnt - net->lost_cnt);
3173                                 net->ecn_ce_pkt_cnt += cnt;
3174                         }
3175                         net->lost_cnt = pkt_cnt;
3176                         net->last_cwr_tsn = tsn;
3177                         /*
3178                          * Most CC functions will ignore this call, since we
3179                          * are in-window yet of the initial CE the peer saw.
3180                          */
3181                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
3182                 }
3183         }
3184         /*
3185          * We always send a CWR this way if our previous one was lost our
3186          * peer will get an update, or if it is not time again to reduce we
3187          * still get the cwr to the peer. Note we set the override when we
3188          * could not find the TSN on the chunk or the destination network.
3189          */
3190         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
3191 }
3192
3193 static void
3194 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3195 {
3196         /*
3197          * Here we get a CWR from the peer. We must look in the outqueue and
3198          * make sure that we have a covered ECNE in the control chunk part.
3199          * If so remove it.
3200          */
3201         struct sctp_tmit_chunk *chk, *nchk;
3202         struct sctp_ecne_chunk *ecne;
3203         int override;
3204         uint32_t cwr_tsn;
3205
3206         cwr_tsn = ntohl(cp->tsn);
3207         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3208         TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) {
3209                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3210                         continue;
3211                 }
3212                 if ((override == 0) && (chk->whoTo != net)) {
3213                         /* Must be from the right src unless override is set */
3214                         continue;
3215                 }
3216                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3217                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3218                         /* this covers this ECNE, we can remove it */
3219                         stcb->asoc.ecn_echo_cnt_onq--;
3220                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3221                             sctp_next);
3222                         stcb->asoc.ctrl_queue_cnt--;
3223                         sctp_m_freem(chk->data);
3224                         chk->data = NULL;
3225                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3226                         if (override == 0) {
3227                                 break;
3228                         }
3229                 }
3230         }
3231 }
3232
3233 static void
3234 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3235     struct sctp_tcb *stcb, struct sctp_nets *net)
3236 {
3237 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3238         struct socket *so;
3239 #endif
3240
3241         SCTPDBG(SCTP_DEBUG_INPUT2,
3242             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3243         if (stcb == NULL)
3244                 return;
3245
3246         /* process according to association state */
3247         if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3248                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3249                 SCTPDBG(SCTP_DEBUG_INPUT2,
3250                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3251                 SCTP_TCB_UNLOCK(stcb);
3252                 return;
3253         }
3254         /* notify upper layer protocol */
3255         if (stcb->sctp_socket) {
3256                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3257         }
3258 #ifdef INVARIANTS
3259         if (!TAILQ_EMPTY(&stcb->asoc.send_queue) ||
3260             !TAILQ_EMPTY(&stcb->asoc.sent_queue) ||
3261             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
3262                 panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
3263         }
3264 #endif
3265         /* stop the timer */
3266         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net,
3267             SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3268         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3269         /* free the TCB */
3270         SCTPDBG(SCTP_DEBUG_INPUT2,
3271             "sctp_handle_shutdown_complete: calls free-asoc\n");
3272 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3273         so = SCTP_INP_SO(stcb->sctp_ep);
3274         atomic_add_int(&stcb->asoc.refcnt, 1);
3275         SCTP_TCB_UNLOCK(stcb);
3276         SCTP_SOCKET_LOCK(so, 1);
3277         SCTP_TCB_LOCK(stcb);
3278         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3279 #endif
3280         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
3281             SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3282 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3283         SCTP_SOCKET_UNLOCK(so, 1);
3284 #endif
3285         return;
3286 }
3287
3288 static int
3289 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3290     struct sctp_nets *net, uint8_t flg)
3291 {
3292         switch (desc->chunk_type) {
3293         case SCTP_DATA:
3294                 /* find the tsn to resend (possibly */
3295                 {
3296                         uint32_t tsn;
3297                         struct sctp_tmit_chunk *tp1;
3298
3299                         tsn = ntohl(desc->tsn_ifany);
3300                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3301                                 if (tp1->rec.data.tsn == tsn) {
3302                                         /* found it */
3303                                         break;
3304                                 }
3305                                 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) {
3306                                         /* not found */
3307                                         tp1 = NULL;
3308                                         break;
3309                                 }
3310                         }
3311                         if (tp1 == NULL) {
3312                                 /*
3313                                  * Do it the other way , aka without paying
3314                                  * attention to queue seq order.
3315                                  */
3316                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3317                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3318                                         if (tp1->rec.data.tsn == tsn) {
3319                                                 /* found it */
3320                                                 break;
3321                                         }
3322                                 }
3323                         }
3324                         if (tp1 == NULL) {
3325                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3326                         }
3327                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3328                                 uint8_t *ddp;
3329
3330                                 if (((flg & SCTP_BADCRC) == 0) &&
3331                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3332                                         return (0);
3333                                 }
3334                                 if ((stcb->asoc.peers_rwnd == 0) &&
3335                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3336                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3337                                         return (0);
3338                                 }
3339                                 if (stcb->asoc.peers_rwnd == 0 &&
3340                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3341                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3342                                         return (0);
3343                                 }
3344                                 ddp = (uint8_t *)(mtod(tp1->data, caddr_t)+
3345                                     sizeof(struct sctp_data_chunk));
3346                                 {
3347                                         unsigned int iii;
3348
3349                                         for (iii = 0; iii < sizeof(desc->data_bytes);
3350                                             iii++) {
3351                                                 if (ddp[iii] != desc->data_bytes[iii]) {
3352                                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3353                                                         return (-1);
3354                                                 }
3355                                         }
3356                                 }
3357
3358                                 if (tp1->do_rtt) {
3359                                         /*
3360                                          * this guy had a RTO calculation
3361                                          * pending on it, cancel it
3362                                          */
3363                                         if (tp1->whoTo->rto_needed == 0) {
3364                                                 tp1->whoTo->rto_needed = 1;
3365                                         }
3366                                         tp1->do_rtt = 0;
3367                                 }
3368                                 SCTP_STAT_INCR(sctps_pdrpmark);
3369                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3370                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3371                                 /*
3372                                  * mark it as if we were doing a FR, since
3373                                  * we will be getting gap ack reports behind
3374                                  * the info from the router.
3375                                  */
3376                                 tp1->rec.data.doing_fast_retransmit = 1;
3377                                 /*
3378                                  * mark the tsn with what sequences can
3379                                  * cause a new FR.
3380                                  */
3381                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3382                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3383                                 } else {
3384                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn;
3385                                 }
3386
3387                                 /* restart the timer */
3388                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3389                                     stcb, tp1->whoTo,
3390                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3391                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3392                                     stcb, tp1->whoTo);
3393
3394                                 /* fix counts and things */
3395                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3396                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3397                                             tp1->whoTo->flight_size,
3398                                             tp1->book_size,
3399                                             (uint32_t)(uintptr_t)stcb,
3400                                             tp1->rec.data.tsn);
3401                                 }
3402                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3403                                         sctp_flight_size_decrease(tp1);
3404                                         sctp_total_flight_decrease(stcb, tp1);
3405                                 }
3406                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3407                         } {
3408                                 /* audit code */
3409                                 unsigned int audit;
3410
3411                                 audit = 0;
3412                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3413                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3414                                                 audit++;
3415                                 }
3416                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3417                                     sctp_next) {
3418                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3419                                                 audit++;
3420                                 }
3421                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3422                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3423                                             audit, stcb->asoc.sent_queue_retran_cnt);
3424 #ifndef SCTP_AUDITING_ENABLED
3425                                         stcb->asoc.sent_queue_retran_cnt = audit;
3426 #endif
3427                                 }
3428                         }
3429                 }
3430                 break;
3431         case SCTP_ASCONF:
3432                 {
3433                         struct sctp_tmit_chunk *asconf;
3434
3435                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3436                             sctp_next) {
3437                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3438                                         break;
3439                                 }
3440                         }
3441                         if (asconf) {
3442                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3443                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3444                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3445                                 asconf->snd_count--;
3446                         }
3447                 }
3448                 break;
3449         case SCTP_INITIATION:
3450                 /* resend the INIT */
3451                 stcb->asoc.dropped_special_cnt++;
3452                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3453                         /*
3454                          * If we can get it in, in a few attempts we do
3455                          * this, otherwise we let the timer fire.
3456                          */
3457                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3458                             stcb, net,
3459                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
3460                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3461                 }
3462                 break;
3463         case SCTP_SELECTIVE_ACK:
3464         case SCTP_NR_SELECTIVE_ACK:
3465                 /* resend the sack */
3466                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3467                 break;
3468         case SCTP_HEARTBEAT_REQUEST:
3469                 /* resend a demand HB */
3470                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3471                         /*
3472                          * Only retransmit if we KNOW we wont destroy the
3473                          * tcb
3474                          */
3475                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3476                 }
3477                 break;
3478         case SCTP_SHUTDOWN:
3479                 sctp_send_shutdown(stcb, net);
3480                 break;
3481         case SCTP_SHUTDOWN_ACK:
3482                 sctp_send_shutdown_ack(stcb, net);
3483                 break;
3484         case SCTP_COOKIE_ECHO:
3485                 {
3486                         struct sctp_tmit_chunk *cookie;
3487
3488                         cookie = NULL;
3489                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3490                             sctp_next) {
3491                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3492                                         break;
3493                                 }
3494                         }
3495                         if (cookie) {
3496                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3497                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3498                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3499                                 sctp_stop_all_cookie_timers(stcb);
3500                         }
3501                 }
3502                 break;
3503         case SCTP_COOKIE_ACK:
3504                 sctp_send_cookie_ack(stcb);
3505                 break;
3506         case SCTP_ASCONF_ACK:
3507                 /* resend last asconf ack */
3508                 sctp_send_asconf_ack(stcb);
3509                 break;
3510         case SCTP_IFORWARD_CUM_TSN:
3511         case SCTP_FORWARD_CUM_TSN:
3512                 send_forward_tsn(stcb, &stcb->asoc);
3513                 break;
3514                 /* can't do anything with these */
3515         case SCTP_PACKET_DROPPED:
3516         case SCTP_INITIATION_ACK:       /* this should not happen */
3517         case SCTP_HEARTBEAT_ACK:
3518         case SCTP_ABORT_ASSOCIATION:
3519         case SCTP_OPERATION_ERROR:
3520         case SCTP_SHUTDOWN_COMPLETE:
3521         case SCTP_ECN_ECHO:
3522         case SCTP_ECN_CWR:
3523         default:
3524                 break;
3525         }
3526         return (0);
3527 }
3528
3529 void
3530 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3531 {
3532         uint32_t i;
3533         uint16_t temp;
3534
3535         /*
3536          * We set things to 0xffffffff since this is the last delivered
3537          * sequence and we will be sending in 0 after the reset.
3538          */
3539
3540         if (number_entries) {
3541                 for (i = 0; i < number_entries; i++) {
3542                         temp = ntohs(list[i]);
3543                         if (temp >= stcb->asoc.streamincnt) {
3544                                 continue;
3545                         }
3546                         stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff;
3547                 }
3548         } else {
3549                 list = NULL;
3550                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3551                         stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
3552                 }
3553         }
3554         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3555 }
3556
3557 static void
3558 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3559 {
3560         uint32_t i;
3561         uint16_t temp;
3562
3563         if (number_entries > 0) {
3564                 for (i = 0; i < number_entries; i++) {
3565                         temp = ntohs(list[i]);
3566                         if (temp >= stcb->asoc.streamoutcnt) {
3567                                 /* no such stream */
3568                                 continue;
3569                         }
3570                         stcb->asoc.strmout[temp].next_mid_ordered = 0;
3571                         stcb->asoc.strmout[temp].next_mid_unordered = 0;
3572                 }
3573         } else {
3574                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3575                         stcb->asoc.strmout[i].next_mid_ordered = 0;
3576                         stcb->asoc.strmout[i].next_mid_unordered = 0;
3577                 }
3578         }
3579         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3580 }
3581
3582 static void
3583 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3584 {
3585         uint32_t i;
3586         uint16_t temp;
3587
3588         if (number_entries > 0) {
3589                 for (i = 0; i < number_entries; i++) {
3590                         temp = ntohs(list[i]);
3591                         if (temp >= stcb->asoc.streamoutcnt) {
3592                                 /* no such stream */
3593                                 continue;
3594                         }
3595                         stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN;
3596                 }
3597         } else {
3598                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3599                         stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN;
3600                 }
3601         }
3602 }
3603
3604
3605 struct sctp_stream_reset_request *
3606 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3607 {
3608         struct sctp_association *asoc;
3609         struct sctp_chunkhdr *ch;
3610         struct sctp_stream_reset_request *r;
3611         struct sctp_tmit_chunk *chk;
3612         int len, clen;
3613
3614         asoc = &stcb->asoc;
3615         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3616                 asoc->stream_reset_outstanding = 0;
3617                 return (NULL);
3618         }
3619         if (stcb->asoc.str_reset == NULL) {
3620                 asoc->stream_reset_outstanding = 0;
3621                 return (NULL);
3622         }
3623         chk = stcb->asoc.str_reset;
3624         if (chk->data == NULL) {
3625                 return (NULL);
3626         }
3627         if (bchk) {
3628                 /* he wants a copy of the chk pointer */
3629                 *bchk = chk;
3630         }
3631         clen = chk->send_size;
3632         ch = mtod(chk->data, struct sctp_chunkhdr *);
3633         r = (struct sctp_stream_reset_request *)(ch + 1);
3634         if (ntohl(r->request_seq) == seq) {
3635                 /* found it */
3636                 return (r);
3637         }
3638         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3639         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3640                 /* move to the next one, there can only be a max of two */
3641                 r = (struct sctp_stream_reset_request *)((caddr_t)r + len);
3642                 if (ntohl(r->request_seq) == seq) {
3643                         return (r);
3644                 }
3645         }
3646         /* that seq is not here */
3647         return (NULL);
3648 }
3649
3650 static void
3651 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3652 {
3653         struct sctp_association *asoc;
3654         struct sctp_tmit_chunk *chk;
3655
3656         asoc = &stcb->asoc;
3657         chk = asoc->str_reset;
3658         if (chk == NULL) {
3659                 return;
3660         }
3661         asoc->str_reset = NULL;
3662         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb,
3663             chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28);
3664         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
3665         asoc->ctrl_queue_cnt--;
3666         if (chk->data) {
3667                 sctp_m_freem(chk->data);
3668                 chk->data = NULL;
3669         }
3670         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3671 }
3672
3673
3674 static int
3675 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3676     uint32_t seq, uint32_t action,
3677     struct sctp_stream_reset_response *respin)
3678 {
3679         uint16_t type;
3680         int lparam_len;
3681         struct sctp_association *asoc = &stcb->asoc;
3682         struct sctp_tmit_chunk *chk;
3683         struct sctp_stream_reset_request *req_param;
3684         struct sctp_stream_reset_out_request *req_out_param;
3685         struct sctp_stream_reset_in_request *req_in_param;
3686         uint32_t number_entries;
3687
3688         if (asoc->stream_reset_outstanding == 0) {
3689                 /* duplicate */
3690                 return (0);
3691         }
3692         if (seq == stcb->asoc.str_reset_seq_out) {
3693                 req_param = sctp_find_stream_reset(stcb, seq, &chk);
3694                 if (req_param != NULL) {
3695                         stcb->asoc.str_reset_seq_out++;
3696                         type = ntohs(req_param->ph.param_type);
3697                         lparam_len = ntohs(req_param->ph.param_length);
3698                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3699                                 int no_clear = 0;
3700
3701                                 req_out_param = (struct sctp_stream_reset_out_request *)req_param;
3702                                 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3703                                 asoc->stream_reset_out_is_outstanding = 0;
3704                                 if (asoc->stream_reset_outstanding)
3705                                         asoc->stream_reset_outstanding--;
3706                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3707                                         /* do it */
3708                                         sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
3709                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3710                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3711                                 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) {
3712                                         /*
3713                                          * Set it up so we don't stop
3714                                          * retransmitting
3715                                          */
3716                                         asoc->stream_reset_outstanding++;
3717                                         stcb->asoc.str_reset_seq_out--;
3718                                         asoc->stream_reset_out_is_outstanding = 1;
3719                                         no_clear = 1;
3720                                 } else {
3721                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3722                                 }
3723                                 if (no_clear == 0) {
3724                                         sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams);
3725                                 }
3726                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3727                                 req_in_param = (struct sctp_stream_reset_in_request *)req_param;
3728                                 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3729                                 if (asoc->stream_reset_outstanding)
3730                                         asoc->stream_reset_outstanding--;
3731                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3732                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3733                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3734                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3735                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3736                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3737                                 }
3738                         } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3739                                 /* Ok we now may have more streams */
3740                                 int num_stream;
3741
3742                                 num_stream = stcb->asoc.strm_pending_add_size;
3743                                 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3744                                         /* TSNH */
3745                                         num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3746                                 }
3747                                 stcb->asoc.strm_pending_add_size = 0;
3748                                 if (asoc->stream_reset_outstanding)
3749                                         asoc->stream_reset_outstanding--;
3750                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3751                                         /* Put the new streams into effect */
3752                                         int i;
3753
3754                                         for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) {
3755                                                 asoc->strmout[i].state = SCTP_STREAM_OPEN;
3756                                         }
3757                                         asoc->streamoutcnt += num_stream;
3758                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3759                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3760                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3761                                             SCTP_STREAM_CHANGE_DENIED);
3762                                 } else {
3763                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3764                                             SCTP_STREAM_CHANGE_FAILED);
3765                                 }
3766                         } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3767                                 if (asoc->stream_reset_outstanding)
3768                                         asoc->stream_reset_outstanding--;
3769                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3770                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3771                                             SCTP_STREAM_CHANGE_DENIED);
3772                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3773                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3774                                             SCTP_STREAM_CHANGE_FAILED);
3775                                 }
3776                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3777                                 /**
3778                                  * a) Adopt the new in tsn.
3779                                  * b) reset the map
3780                                  * c) Adopt the new out-tsn
3781                                  */
3782                                 struct sctp_stream_reset_response_tsn *resp;
3783                                 struct sctp_forward_tsn_chunk fwdtsn;
3784                                 int abort_flag = 0;
3785
3786                                 if (respin == NULL) {
3787                                         /* huh ? */
3788                                         return (0);
3789                                 }
3790                                 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
3791                                         return (0);
3792                                 }
3793                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3794                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3795                                         asoc->stream_reset_outstanding--;
3796                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3797                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3798                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3799                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3800                                         if (abort_flag) {
3801                                                 return (1);
3802                                         }
3803                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3804                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3805                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3806                                         }
3807
3808                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3809                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3810                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3811
3812                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3813                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3814
3815                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3816                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3817
3818                                         sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3819                                         sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3820                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3821                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3822                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3823                                             SCTP_ASSOC_RESET_DENIED);
3824                                 } else {
3825                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3826                                             SCTP_ASSOC_RESET_FAILED);
3827                                 }
3828                         }
3829                         /* get rid of the request and get the request flags */
3830                         if (asoc->stream_reset_outstanding == 0) {
3831                                 sctp_clean_up_stream_reset(stcb);
3832                         }
3833                 }
3834         }
3835         if (asoc->stream_reset_outstanding == 0) {
3836                 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3837         }
3838         return (0);
3839 }
3840
3841 static void
3842 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3843     struct sctp_tmit_chunk *chk,
3844     struct sctp_stream_reset_in_request *req, int trunc)
3845 {
3846         uint32_t seq;
3847         int len, i;
3848         int number_entries;
3849         uint16_t temp;
3850
3851         /*
3852          * peer wants me to send a str-reset to him for my outgoing seq's if
3853          * seq_in is right.
3854          */
3855         struct sctp_association *asoc = &stcb->asoc;
3856
3857         seq = ntohl(req->request_seq);
3858         if (asoc->str_reset_seq_in == seq) {
3859                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3860                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3861                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3862                 } else if (trunc) {
3863                         /* Can't do it, since they exceeded our buffer size  */
3864                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3865                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3866                         len = ntohs(req->ph.param_length);
3867                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3868                         if (number_entries) {
3869                                 for (i = 0; i < number_entries; i++) {
3870                                         temp = ntohs(req->list_of_streams[i]);
3871                                         if (temp >= stcb->asoc.streamoutcnt) {
3872                                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3873                                                 goto bad_boy;
3874                                         }
3875                                         req->list_of_streams[i] = temp;
3876                                 }
3877                                 for (i = 0; i < number_entries; i++) {
3878                                         if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) {
3879                                                 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING;
3880                                         }
3881                                 }
3882                         } else {
3883                                 /* Its all */
3884                                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3885                                         if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN)
3886                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING;
3887                                 }
3888                         }
3889                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3890                 } else {
3891                         /* Can't do it, since we have sent one out */
3892                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3893                 }
3894 bad_boy:
3895                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3896                 asoc->str_reset_seq_in++;
3897         } else if (asoc->str_reset_seq_in - 1 == seq) {
3898                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3899         } else if (asoc->str_reset_seq_in - 2 == seq) {
3900                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3901         } else {
3902                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3903         }
3904         sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3905 }
3906
3907 static int
3908 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3909     struct sctp_tmit_chunk *chk,
3910     struct sctp_stream_reset_tsn_request *req)
3911 {
3912         /* reset all in and out and update the tsn */
3913         /*
3914          * A) reset my str-seq's on in and out. B) Select a receive next,
3915          * and set cum-ack to it. Also process this selected number as a
3916          * fwd-tsn as well. C) set in the response my next sending seq.
3917          */
3918         struct sctp_forward_tsn_chunk fwdtsn;
3919         struct sctp_association *asoc = &stcb->asoc;
3920         int abort_flag = 0;
3921         uint32_t seq;
3922
3923         seq = ntohl(req->request_seq);
3924         if (asoc->str_reset_seq_in == seq) {
3925                 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3926                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3927                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3928                 } else {
3929                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3930                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3931                         fwdtsn.ch.chunk_flags = 0;
3932                         fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3933                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3934                         if (abort_flag) {
3935                                 return (1);
3936                         }
3937                         asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3938                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3939                                 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3940                         }
3941                         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3942                         asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3943                         memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3944                         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3945                         memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3946                         atomic_add_int(&asoc->sending_seq, 1);
3947                         /* save off historical data for retrans */
3948                         asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3949                         asoc->last_sending_seq[0] = asoc->sending_seq;
3950                         asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3951                         asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3952                         sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3953                         sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3954                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3955                         sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3956                 }
3957                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3958                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3959                 asoc->str_reset_seq_in++;
3960         } else if (asoc->str_reset_seq_in - 1 == seq) {
3961                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3962                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3963         } else if (asoc->str_reset_seq_in - 2 == seq) {
3964                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3965                     asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3966         } else {
3967                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3968         }
3969         return (0);
3970 }
3971
3972 static void
3973 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3974     struct sctp_tmit_chunk *chk,
3975     struct sctp_stream_reset_out_request *req, int trunc)
3976 {
3977         uint32_t seq, tsn;
3978         int number_entries, len;
3979         struct sctp_association *asoc = &stcb->asoc;
3980
3981         seq = ntohl(req->request_seq);
3982
3983         /* now if its not a duplicate we process it */
3984         if (asoc->str_reset_seq_in == seq) {
3985                 len = ntohs(req->ph.param_length);
3986                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3987                 /*
3988                  * the sender is resetting, handle the list issue.. we must
3989                  * a) verify if we can do the reset, if so no problem b) If
3990                  * we can't do the reset we must copy the request. c) queue
3991                  * it, and setup the data in processor to trigger it off
3992                  * when needed and dequeue all the queued data.
3993                  */
3994                 tsn = ntohl(req->send_reset_at_tsn);
3995
3996                 /* move the reset action back one */
3997                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3998                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3999                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4000                 } else if (trunc) {
4001                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4002                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
4003                         /* we can do it now */
4004                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
4005                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4006                 } else {
4007                         /*
4008                          * we must queue it up and thus wait for the TSN's
4009                          * to arrive that are at or before tsn
4010                          */
4011                         struct sctp_stream_reset_list *liste;
4012                         int siz;
4013
4014                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
4015                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
4016                             siz, SCTP_M_STRESET);
4017                         if (liste == NULL) {
4018                                 /* gak out of memory */
4019                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4020                                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4021                                 return;
4022                         }
4023                         liste->seq = seq;
4024                         liste->tsn = tsn;
4025                         liste->number_entries = number_entries;
4026                         memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
4027                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
4028                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS;
4029                 }
4030                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4031                 asoc->str_reset_seq_in++;
4032         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4033                 /*
4034                  * one seq back, just echo back last action since my
4035                  * response was lost.
4036                  */
4037                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4038         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4039                 /*
4040                  * two seq back, just echo back last action since my
4041                  * response was lost.
4042                  */
4043                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4044         } else {
4045                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4046         }
4047 }
4048
4049 static void
4050 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
4051     struct sctp_stream_reset_add_strm *str_add)
4052 {
4053         /*
4054          * Peer is requesting to add more streams. If its within our
4055          * max-streams we will allow it.
4056          */
4057         uint32_t num_stream, i;
4058         uint32_t seq;
4059         struct sctp_association *asoc = &stcb->asoc;
4060         struct sctp_queued_to_read *ctl, *nctl;
4061
4062         /* Get the number. */
4063         seq = ntohl(str_add->request_seq);
4064         num_stream = ntohs(str_add->number_of_streams);
4065         /* Now what would be the new total? */
4066         if (asoc->str_reset_seq_in == seq) {
4067                 num_stream += stcb->asoc.streamincnt;
4068                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4069                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4070                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4071                 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
4072                     (num_stream > 0xffff)) {
4073                         /* We must reject it they ask for to many */
4074         denied:
4075                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4076                 } else {
4077                         /* Ok, we can do that :-) */
4078                         struct sctp_stream_in *oldstrm;
4079
4080                         /* save off the old */
4081                         oldstrm = stcb->asoc.strmin;
4082                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
4083                             (num_stream * sizeof(struct sctp_stream_in)),
4084                             SCTP_M_STRMI);
4085                         if (stcb->asoc.strmin == NULL) {
4086                                 stcb->asoc.strmin = oldstrm;
4087                                 goto denied;
4088                         }
4089                         /* copy off the old data */
4090                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
4091                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
4092                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
4093                                 stcb->asoc.strmin[i].sid = i;
4094                                 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered;
4095                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
4096                                 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started;
4097                                 /* now anything on those queues? */
4098                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) {
4099                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm);
4100                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm);
4101                                 }
4102                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) {
4103                                         TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm);
4104                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm);
4105                                 }
4106                         }
4107                         /* Init the new streams */
4108                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
4109                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
4110                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
4111                                 stcb->asoc.strmin[i].sid = i;
4112                                 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
4113                                 stcb->asoc.strmin[i].pd_api_started = 0;
4114                                 stcb->asoc.strmin[i].delivery_started = 0;
4115                         }
4116                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
4117                         /* update the size */
4118                         stcb->asoc.streamincnt = num_stream;
4119                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4120                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
4121                 }
4122                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4123                 asoc->str_reset_seq_in++;
4124         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4125                 /*
4126                  * one seq back, just echo back last action since my
4127                  * response was lost.
4128                  */
4129                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4130         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4131                 /*
4132                  * two seq back, just echo back last action since my
4133                  * response was lost.
4134                  */
4135                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4136         } else {
4137                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4138
4139         }
4140 }
4141
4142 static void
4143 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
4144     struct sctp_stream_reset_add_strm *str_add)
4145 {
4146         /*
4147          * Peer is requesting to add more streams. If its within our
4148          * max-streams we will allow it.
4149          */
4150         uint16_t num_stream;
4151         uint32_t seq;
4152         struct sctp_association *asoc = &stcb->asoc;
4153
4154         /* Get the number. */
4155         seq = ntohl(str_add->request_seq);
4156         num_stream = ntohs(str_add->number_of_streams);
4157         /* Now what would be the new total? */
4158         if (asoc->str_reset_seq_in == seq) {
4159                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4160                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4161                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4162                 } else if (stcb->asoc.stream_reset_outstanding) {
4163                         /* We must reject it we have something pending */
4164                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
4165                 } else {
4166                         /* Ok, we can do that :-) */
4167                         int mychk;
4168
4169                         mychk = stcb->asoc.streamoutcnt;
4170                         mychk += num_stream;
4171                         if (mychk < 0x10000) {
4172                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4173                                 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) {
4174                                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4175                                 }
4176                         } else {
4177                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4178                         }
4179                 }
4180                 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
4181                 asoc->str_reset_seq_in++;
4182         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4183                 /*
4184                  * one seq back, just echo back last action since my
4185                  * response was lost.
4186                  */
4187                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4188         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4189                 /*
4190                  * two seq back, just echo back last action since my
4191                  * response was lost.
4192                  */
4193                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4194         } else {
4195                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4196         }
4197 }
4198
4199 #ifdef __GNUC__
4200 __attribute__((noinline))
4201 #endif
4202 static int
4203 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
4204     struct sctp_chunkhdr *ch_req)
4205 {
4206         uint16_t remaining_length, param_len, ptype;
4207         struct sctp_paramhdr pstore;
4208         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
4209         uint32_t seq = 0;
4210         int num_req = 0;
4211         int trunc = 0;
4212         struct sctp_tmit_chunk *chk;
4213         struct sctp_chunkhdr *ch;
4214         struct sctp_paramhdr *ph;
4215         int ret_code = 0;
4216         int num_param = 0;
4217
4218         /* now it may be a reset or a reset-response */
4219         remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
4220
4221         /* setup for adding the response */
4222         sctp_alloc_a_chunk(stcb, chk);
4223         if (chk == NULL) {
4224                 return (ret_code);
4225         }
4226         chk->copy_by_ref = 0;
4227         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
4228         chk->rec.chunk_id.can_take_data = 0;
4229         chk->flags = 0;
4230         chk->asoc = &stcb->asoc;
4231         chk->no_fr_allowed = 0;
4232         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
4233         chk->book_size_scale = 0;
4234         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
4235         if (chk->data == NULL) {
4236 strres_nochunk:
4237                 if (chk->data) {
4238                         sctp_m_freem(chk->data);
4239                         chk->data = NULL;
4240                 }
4241                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
4242                 return (ret_code);
4243         }
4244         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
4245
4246         /* setup chunk parameters */
4247         chk->sent = SCTP_DATAGRAM_UNSENT;
4248         chk->snd_count = 0;
4249         chk->whoTo = NULL;
4250
4251         ch = mtod(chk->data, struct sctp_chunkhdr *);
4252         ch->chunk_type = SCTP_STREAM_RESET;
4253         ch->chunk_flags = 0;
4254         ch->chunk_length = htons(chk->send_size);
4255         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4256         offset += sizeof(struct sctp_chunkhdr);
4257         while (remaining_length >= sizeof(struct sctp_paramhdr)) {
4258                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore);
4259                 if (ph == NULL) {
4260                         /* TSNH */
4261                         break;
4262                 }
4263                 param_len = ntohs(ph->param_length);
4264                 if ((param_len > remaining_length) ||
4265                     (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
4266                         /* bad parameter length */
4267                         break;
4268                 }
4269                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
4270                     (uint8_t *)&cstore);
4271                 if (ph == NULL) {
4272                         /* TSNH */
4273                         break;
4274                 }
4275                 ptype = ntohs(ph->param_type);
4276                 num_param++;
4277                 if (param_len > sizeof(cstore)) {
4278                         trunc = 1;
4279                 } else {
4280                         trunc = 0;
4281                 }
4282                 if (num_param > SCTP_MAX_RESET_PARAMS) {
4283                         /* hit the max of parameters already sorry.. */
4284                         break;
4285                 }
4286                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4287                         struct sctp_stream_reset_out_request *req_out;
4288
4289                         if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
4290                                 break;
4291                         }
4292                         req_out = (struct sctp_stream_reset_out_request *)ph;
4293                         num_req++;
4294                         if (stcb->asoc.stream_reset_outstanding) {
4295                                 seq = ntohl(req_out->response_seq);
4296                                 if (seq == stcb->asoc.str_reset_seq_out) {
4297                                         /* implicit ack */
4298                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4299                                 }
4300                         }
4301                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4302                 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4303                         struct sctp_stream_reset_add_strm *str_add;
4304
4305                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4306                                 break;
4307                         }
4308                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4309                         num_req++;
4310                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4311                 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4312                         struct sctp_stream_reset_add_strm *str_add;
4313
4314                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4315                                 break;
4316                         }
4317                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4318                         num_req++;
4319                         sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4320                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4321                         struct sctp_stream_reset_in_request *req_in;
4322
4323                         num_req++;
4324                         req_in = (struct sctp_stream_reset_in_request *)ph;
4325                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4326                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4327                         struct sctp_stream_reset_tsn_request *req_tsn;
4328
4329                         num_req++;
4330                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4331                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4332                                 ret_code = 1;
4333                                 goto strres_nochunk;
4334                         }
4335                         /* no more */
4336                         break;
4337                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4338                         struct sctp_stream_reset_response *resp;
4339                         uint32_t result;
4340
4341                         if (param_len < sizeof(struct sctp_stream_reset_response)) {
4342                                 break;
4343                         }
4344                         resp = (struct sctp_stream_reset_response *)ph;
4345                         seq = ntohl(resp->response_seq);
4346                         result = ntohl(resp->result);
4347                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4348                                 ret_code = 1;
4349                                 goto strres_nochunk;
4350                         }
4351                 } else {
4352                         break;
4353                 }
4354                 offset += SCTP_SIZE32(param_len);
4355                 if (remaining_length >= SCTP_SIZE32(param_len)) {
4356                         remaining_length -= SCTP_SIZE32(param_len);
4357                 } else {
4358                         remaining_length = 0;
4359                 }
4360         }
4361         if (num_req == 0) {
4362                 /* we have no response free the stuff */
4363                 goto strres_nochunk;
4364         }
4365         /* ok we have a chunk to link in */
4366         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4367             chk,
4368             sctp_next);
4369         stcb->asoc.ctrl_queue_cnt++;
4370         return (ret_code);
4371 }
4372
4373 /*
4374  * Handle a router or endpoints report of a packet loss, there are two ways
4375  * to handle this, either we get the whole packet and must disect it
4376  * ourselves (possibly with truncation and or corruption) or it is a summary
4377  * from a middle box that did the disectting for us.
4378  */
4379 static void
4380 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4381     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4382 {
4383         uint32_t bottle_bw, on_queue;
4384         uint16_t trunc_len;
4385         unsigned int chlen;
4386         unsigned int at;
4387         struct sctp_chunk_desc desc;
4388         struct sctp_chunkhdr *ch;
4389
4390         chlen = ntohs(cp->ch.chunk_length);
4391         chlen -= sizeof(struct sctp_pktdrop_chunk);
4392         /* XXX possible chlen underflow */
4393         if (chlen == 0) {
4394                 ch = NULL;
4395                 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
4396                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4397         } else {
4398                 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
4399                 chlen -= sizeof(struct sctphdr);
4400                 /* XXX possible chlen underflow */
4401                 memset(&desc, 0, sizeof(desc));
4402         }
4403         trunc_len = (uint16_t)ntohs(cp->trunc_len);
4404         if (trunc_len > limit) {
4405                 trunc_len = limit;
4406         }
4407
4408         /* now the chunks themselves */
4409         while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
4410                 desc.chunk_type = ch->chunk_type;
4411                 /* get amount we need to move */
4412                 at = ntohs(ch->chunk_length);
4413                 if (at < sizeof(struct sctp_chunkhdr)) {
4414                         /* corrupt chunk, maybe at the end? */
4415                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4416                         break;
4417                 }
4418                 if (trunc_len == 0) {
4419                         /* we are supposed to have all of it */
4420                         if (at > chlen) {
4421                                 /* corrupt skip it */
4422                                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4423                                 break;
4424                         }
4425                 } else {
4426                         /* is there enough of it left ? */
4427                         if (desc.chunk_type == SCTP_DATA) {
4428                                 if (chlen < (sizeof(struct sctp_data_chunk) +
4429                                     sizeof(desc.data_bytes))) {
4430                                         break;
4431                                 }
4432                         } else {
4433                                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4434                                         break;
4435                                 }
4436                         }
4437                 }
4438                 if (desc.chunk_type == SCTP_DATA) {
4439                         /* can we get out the tsn? */
4440                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4441                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4442
4443                         if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
4444                                 /* yep */
4445                                 struct sctp_data_chunk *dcp;
4446                                 uint8_t *ddp;
4447                                 unsigned int iii;
4448
4449                                 dcp = (struct sctp_data_chunk *)ch;
4450                                 ddp = (uint8_t *)(dcp + 1);
4451                                 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
4452                                         desc.data_bytes[iii] = ddp[iii];
4453                                 }
4454                                 desc.tsn_ifany = dcp->dp.tsn;
4455                         } else {
4456                                 /* nope we are done. */
4457                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4458                                 break;
4459                         }
4460                 } else {
4461                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4462                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4463                 }
4464
4465                 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
4466                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4467                         break;
4468                 }
4469                 if (SCTP_SIZE32(at) > chlen) {
4470                         break;
4471                 }
4472                 chlen -= SCTP_SIZE32(at);
4473                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4474                         /* done, none left */
4475                         break;
4476                 }
4477                 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
4478         }
4479         /* Now update any rwnd --- possibly */
4480         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4481                 /* From a peer, we get a rwnd report */
4482                 uint32_t a_rwnd;
4483
4484                 SCTP_STAT_INCR(sctps_pdrpfehos);
4485
4486                 bottle_bw = ntohl(cp->bottle_bw);
4487                 on_queue = ntohl(cp->current_onq);
4488                 if (bottle_bw && on_queue) {
4489                         /* a rwnd report is in here */
4490                         if (bottle_bw > on_queue)
4491                                 a_rwnd = bottle_bw - on_queue;
4492                         else
4493                                 a_rwnd = 0;
4494
4495                         if (a_rwnd == 0)
4496                                 stcb->asoc.peers_rwnd = 0;
4497                         else {
4498                                 if (a_rwnd > stcb->asoc.total_flight) {
4499                                         stcb->asoc.peers_rwnd =
4500                                             a_rwnd - stcb->asoc.total_flight;
4501                                 } else {
4502                                         stcb->asoc.peers_rwnd = 0;
4503                                 }
4504                                 if (stcb->asoc.peers_rwnd <
4505                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4506                                         /* SWS sender side engages */
4507                                         stcb->asoc.peers_rwnd = 0;
4508                                 }
4509                         }
4510                 }
4511         } else {
4512                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4513         }
4514
4515         /* now middle boxes in sat networks get a cwnd bump */
4516         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
4517             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4518             (stcb->asoc.sat_network)) {
4519                 /*
4520                  * This is debatable but for sat networks it makes sense
4521                  * Note if a T3 timer has went off, we will prohibit any
4522                  * changes to cwnd until we exit the t3 loss recovery.
4523                  */
4524                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4525                     net, cp, &bottle_bw, &on_queue);
4526         }
4527 }
4528
4529 /*
4530  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4531  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4532  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4533  * length of the complete packet outputs: - length: modified to remaining
4534  * length after control processing - netp: modified to new sctp_nets after
4535  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4536  * bad packet,...) otherwise return the tcb for this packet
4537  */
4538 #ifdef __GNUC__
4539 __attribute__((noinline))
4540 #endif
4541 static struct sctp_tcb *
4542 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4543     struct sockaddr *src, struct sockaddr *dst,
4544     struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4545     struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4546     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
4547     uint32_t vrf_id, uint16_t port)
4548 {
4549         struct sctp_association *asoc;
4550         struct mbuf *op_err;
4551         char msg[SCTP_DIAG_INFO_LEN];
4552         uint32_t vtag_in;
4553         int num_chunks = 0;     /* number of control chunks processed */
4554         uint32_t chk_length, contiguous;
4555         int ret;
4556         int abort_no_unlock = 0;
4557         int ecne_seen = 0;
4558
4559         /*
4560          * How big should this be, and should it be alloc'd? Lets try the
4561          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4562          * until we get into jumbo grams and such..
4563          */
4564         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4565         int got_auth = 0;
4566         uint32_t auth_offset = 0, auth_len = 0;
4567         int auth_skipped = 0;
4568         int asconf_cnt = 0;
4569 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4570         struct socket *so;
4571 #endif
4572
4573         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4574             iphlen, *offset, length, (void *)stcb);
4575
4576         if (stcb) {
4577                 SCTP_TCB_LOCK_ASSERT(stcb);
4578         }
4579         /* validate chunk header length... */
4580         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4581                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4582                     ntohs(ch->chunk_length));
4583                 *offset = length;
4584                 return (stcb);
4585         }
4586         /*
4587          * validate the verification tag
4588          */
4589         vtag_in = ntohl(sh->v_tag);
4590
4591         if (ch->chunk_type == SCTP_INITIATION) {
4592                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4593                     ntohs(ch->chunk_length), vtag_in);
4594                 if (vtag_in != 0) {
4595                         /* protocol error- silently discard... */
4596                         SCTP_STAT_INCR(sctps_badvtag);
4597                         if (stcb != NULL) {
4598                                 SCTP_TCB_UNLOCK(stcb);
4599                         }
4600                         return (NULL);
4601                 }
4602         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4603                 /*
4604                  * If there is no stcb, skip the AUTH chunk and process
4605                  * later after a stcb is found (to validate the lookup was
4606                  * valid.
4607                  */
4608                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4609                     (stcb == NULL) &&
4610                     (inp->auth_supported == 1)) {
4611                         /* save this chunk for later processing */
4612                         auth_skipped = 1;
4613                         auth_offset = *offset;
4614                         auth_len = ntohs(ch->chunk_length);
4615
4616                         /* (temporarily) move past this chunk */
4617                         *offset += SCTP_SIZE32(auth_len);
4618                         if (*offset >= length) {
4619                                 /* no more data left in the mbuf chain */
4620                                 *offset = length;
4621                                 return (NULL);
4622                         }
4623                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4624                             sizeof(struct sctp_chunkhdr), chunk_buf);
4625                 }
4626                 if (ch == NULL) {
4627                         /* Help */
4628                         *offset = length;
4629                         return (stcb);
4630                 }
4631                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4632                         goto process_control_chunks;
4633                 }
4634                 /*
4635                  * first check if it's an ASCONF with an unknown src addr we
4636                  * need to look inside to find the association
4637                  */
4638                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4639                         struct sctp_chunkhdr *asconf_ch = ch;
4640                         uint32_t asconf_offset = 0, asconf_len = 0;
4641
4642                         /* inp's refcount may be reduced */
4643                         SCTP_INP_INCR_REF(inp);
4644
4645                         asconf_offset = *offset;
4646                         do {
4647                                 asconf_len = ntohs(asconf_ch->chunk_length);
4648                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4649                                         break;
4650                                 stcb = sctp_findassociation_ep_asconf(m,
4651                                     *offset,
4652                                     dst,
4653                                     sh, &inp, netp, vrf_id);
4654                                 if (stcb != NULL)
4655                                         break;
4656                                 asconf_offset += SCTP_SIZE32(asconf_len);
4657                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4658                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4659                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4660                         if (stcb == NULL) {
4661                                 /*
4662                                  * reduce inp's refcount if not reduced in
4663                                  * sctp_findassociation_ep_asconf().
4664                                  */
4665                                 SCTP_INP_DECR_REF(inp);
4666                         }
4667
4668                         /* now go back and verify any auth chunk to be sure */
4669                         if (auth_skipped && (stcb != NULL)) {
4670                                 struct sctp_auth_chunk *auth;
4671
4672                                 auth = (struct sctp_auth_chunk *)
4673                                     sctp_m_getptr(m, auth_offset,
4674                                     auth_len, chunk_buf);
4675                                 got_auth = 1;
4676                                 auth_skipped = 0;
4677                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4678                                     auth_offset)) {
4679                                         /* auth HMAC failed so dump it */
4680                                         *offset = length;
4681                                         return (stcb);
4682                                 } else {
4683                                         /* remaining chunks are HMAC checked */
4684                                         stcb->asoc.authenticated = 1;
4685                                 }
4686                         }
4687                 }
4688                 if (stcb == NULL) {
4689                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4690                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4691                             msg);
4692                         /* no association, so it's out of the blue... */
4693                         sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
4694                             mflowtype, mflowid, inp->fibnum,
4695                             vrf_id, port);
4696                         *offset = length;
4697                         return (NULL);
4698                 }
4699                 asoc = &stcb->asoc;
4700                 /* ABORT and SHUTDOWN can use either v_tag... */
4701                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4702                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4703                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4704                         /* Take the T-bit always into account. */
4705                         if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
4706                             (vtag_in == asoc->my_vtag)) ||
4707                             (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
4708                             (asoc->peer_vtag != htonl(0)) &&
4709                             (vtag_in == asoc->peer_vtag))) {
4710                                 /* this is valid */
4711                         } else {
4712                                 /* drop this packet... */
4713                                 SCTP_STAT_INCR(sctps_badvtag);
4714                                 if (stcb != NULL) {
4715                                         SCTP_TCB_UNLOCK(stcb);
4716                                 }
4717                                 return (NULL);
4718                         }
4719                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4720                         if (vtag_in != asoc->my_vtag) {
4721                                 /*
4722                                  * this could be a stale SHUTDOWN-ACK or the
4723                                  * peer never got the SHUTDOWN-COMPLETE and
4724                                  * is still hung; we have started a new asoc
4725                                  * but it won't complete until the shutdown
4726                                  * is completed
4727                                  */
4728                                 if (stcb != NULL) {
4729                                         SCTP_TCB_UNLOCK(stcb);
4730                                 }
4731                                 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4732                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4733                                     msg);
4734                                 sctp_handle_ootb(m, iphlen, *offset, src, dst,
4735                                     sh, inp, op_err,
4736                                     mflowtype, mflowid, fibnum,
4737                                     vrf_id, port);
4738                                 return (NULL);
4739                         }
4740                 } else {
4741                         /* for all other chunks, vtag must match */
4742                         if (vtag_in != asoc->my_vtag) {
4743                                 /* invalid vtag... */
4744                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4745                                     "invalid vtag: %xh, expect %xh\n",
4746                                     vtag_in, asoc->my_vtag);
4747                                 SCTP_STAT_INCR(sctps_badvtag);
4748                                 if (stcb != NULL) {
4749                                         SCTP_TCB_UNLOCK(stcb);
4750                                 }
4751                                 *offset = length;
4752                                 return (NULL);
4753                         }
4754                 }
4755         }                       /* end if !SCTP_COOKIE_ECHO */
4756         /*
4757          * process all control chunks...
4758          */
4759         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4760             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4761             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4762             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
4763                 /* implied cookie-ack.. we must have lost the ack */
4764                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4765                     *netp);
4766         }
4767
4768 process_control_chunks:
4769         while (IS_SCTP_CONTROL(ch)) {
4770                 /* validate chunk length */
4771                 chk_length = ntohs(ch->chunk_length);
4772                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4773                     ch->chunk_type, chk_length);
4774                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4775                 if (chk_length < sizeof(*ch) ||
4776                     (*offset + (int)chk_length) > length) {
4777                         *offset = length;
4778                         return (stcb);
4779                 }
4780                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4781                 /*
4782                  * INIT and INIT-ACK only gets the init ack "header" portion
4783                  * only because we don't have to process the peer's COOKIE.
4784                  * All others get a complete chunk.
4785                  */
4786                 switch (ch->chunk_type) {
4787                 case SCTP_INITIATION:
4788                         contiguous = sizeof(struct sctp_init_chunk);
4789                         break;
4790                 case SCTP_INITIATION_ACK:
4791                         contiguous = sizeof(struct sctp_init_ack_chunk);
4792                         break;
4793                 default:
4794                         contiguous = min(chk_length, sizeof(chunk_buf));
4795                         break;
4796                 }
4797                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4798                     contiguous,
4799                     chunk_buf);
4800                 if (ch == NULL) {
4801                         *offset = length;
4802                         if (stcb != NULL) {
4803                                 SCTP_TCB_UNLOCK(stcb);
4804                         }
4805                         return (NULL);
4806                 }
4807
4808                 num_chunks++;
4809                 /* Save off the last place we got a control from */
4810                 if (stcb != NULL) {
4811                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4812                                 /*
4813                                  * allow last_control to be NULL if
4814                                  * ASCONF... ASCONF processing will find the
4815                                  * right net later
4816                                  */
4817                                 if ((netp != NULL) && (*netp != NULL))
4818                                         stcb->asoc.last_control_chunk_from = *netp;
4819                         }
4820                 }
4821 #ifdef SCTP_AUDITING_ENABLED
4822                 sctp_audit_log(0xB0, ch->chunk_type);
4823 #endif
4824
4825                 /* check to see if this chunk required auth, but isn't */
4826                 if ((stcb != NULL) &&
4827                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4828                     !stcb->asoc.authenticated) {
4829                         /* "silently" ignore */
4830                         SCTP_STAT_INCR(sctps_recvauthmissing);
4831                         goto next_chunk;
4832                 }
4833                 switch (ch->chunk_type) {
4834                 case SCTP_INITIATION:
4835                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4836                         /* The INIT chunk must be the only chunk. */
4837                         if ((num_chunks > 1) ||
4838                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4839                                 /* RFC 4960 requires that no ABORT is sent */
4840                                 *offset = length;
4841                                 if (stcb != NULL) {
4842                                         SCTP_TCB_UNLOCK(stcb);
4843                                 }
4844                                 return (NULL);
4845                         }
4846                         /* Honor our resource limit. */
4847                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4848                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4849                                 sctp_abort_association(inp, stcb, m, iphlen,
4850                                     src, dst, sh, op_err,
4851                                     mflowtype, mflowid,
4852                                     vrf_id, port);
4853                                 *offset = length;
4854                                 return (NULL);
4855                         }
4856                         sctp_handle_init(m, iphlen, *offset, src, dst, sh,
4857                             (struct sctp_init_chunk *)ch, inp,
4858                             stcb, *netp, &abort_no_unlock,
4859                             mflowtype, mflowid,
4860                             vrf_id, port);
4861                         *offset = length;
4862                         if ((!abort_no_unlock) && (stcb != NULL)) {
4863                                 SCTP_TCB_UNLOCK(stcb);
4864                         }
4865                         return (NULL);
4866                         break;
4867                 case SCTP_PAD_CHUNK:
4868                         break;
4869                 case SCTP_INITIATION_ACK:
4870                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n");
4871                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4872                                 /* We are not interested anymore */
4873                                 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) {
4874                                         ;
4875                                 } else {
4876                                         *offset = length;
4877                                         if (stcb != NULL) {
4878 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4879                                                 so = SCTP_INP_SO(inp);
4880                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4881                                                 SCTP_TCB_UNLOCK(stcb);
4882                                                 SCTP_SOCKET_LOCK(so, 1);
4883                                                 SCTP_TCB_LOCK(stcb);
4884                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4885 #endif
4886                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
4887                                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
4888 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4889                                                 SCTP_SOCKET_UNLOCK(so, 1);
4890 #endif
4891                                         }
4892                                         return (NULL);
4893                                 }
4894                         }
4895                         /* The INIT-ACK chunk must be the only chunk. */
4896                         if ((num_chunks > 1) ||
4897                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4898                                 *offset = length;
4899                                 return (stcb);
4900                         }
4901                         if ((netp != NULL) && (*netp != NULL)) {
4902                                 ret = sctp_handle_init_ack(m, iphlen, *offset,
4903                                     src, dst, sh,
4904                                     (struct sctp_init_ack_chunk *)ch,
4905                                     stcb, *netp,
4906                                     &abort_no_unlock,
4907                                     mflowtype, mflowid,
4908                                     vrf_id);
4909                         } else {
4910                                 ret = -1;
4911                         }
4912                         *offset = length;
4913                         if (abort_no_unlock) {
4914                                 return (NULL);
4915                         }
4916                         /*
4917                          * Special case, I must call the output routine to
4918                          * get the cookie echoed
4919                          */
4920                         if ((stcb != NULL) && (ret == 0)) {
4921                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4922                         }
4923                         return (stcb);
4924                         break;
4925                 case SCTP_SELECTIVE_ACK:
4926                 case SCTP_NR_SELECTIVE_ACK:
4927                         {
4928                                 int abort_now = 0;
4929                                 uint32_t a_rwnd, cum_ack;
4930                                 uint16_t num_seg, num_nr_seg, num_dup;
4931                                 uint8_t flags;
4932                                 int offset_seg, offset_dup;
4933
4934                                 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n",
4935                                     ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK");
4936                                 SCTP_STAT_INCR(sctps_recvsacks);
4937                                 if (stcb == NULL) {
4938                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n",
4939                                             (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK");
4940                                         break;
4941                                 }
4942                                 if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
4943                                         if (chk_length < sizeof(struct sctp_sack_chunk)) {
4944                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4945                                                 break;
4946                                         }
4947                                 } else {
4948                                         if (stcb->asoc.nrsack_supported == 0) {
4949                                                 goto unknown_chunk;
4950                                         }
4951                                         if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
4952                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n");
4953                                                 break;
4954                                         }
4955                                 }
4956                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4957                                         /*-
4958                                          * If we have sent a shutdown-ack, we will pay no
4959                                          * attention to a sack sent in to us since
4960                                          * we don't care anymore.
4961                                          */
4962                                         break;
4963                                 }
4964                                 flags = ch->chunk_flags;
4965                                 if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
4966                                         struct sctp_sack_chunk *sack;
4967
4968                                         sack = (struct sctp_sack_chunk *)ch;
4969                                         cum_ack = ntohl(sack->sack.cum_tsn_ack);
4970                                         num_seg = ntohs(sack->sack.num_gap_ack_blks);
4971                                         num_nr_seg = 0;
4972                                         num_dup = ntohs(sack->sack.num_dup_tsns);
4973                                         a_rwnd = ntohl(sack->sack.a_rwnd);
4974                                         if (sizeof(struct sctp_sack_chunk) +
4975                                             num_seg * sizeof(struct sctp_gap_ack_block) +
4976                                             num_dup * sizeof(uint32_t) != chk_length) {
4977                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4978                                                 break;
4979                                         }
4980                                         offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4981                                         offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4982                                 } else {
4983                                         struct sctp_nr_sack_chunk *nr_sack;
4984
4985                                         nr_sack = (struct sctp_nr_sack_chunk *)ch;
4986                                         cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
4987                                         num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
4988                                         num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
4989                                         num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
4990                                         a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd);
4991                                         if (sizeof(struct sctp_nr_sack_chunk) +
4992                                             (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
4993                                             num_dup * sizeof(uint32_t) != chk_length) {
4994                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
4995                                                 break;
4996                                         }
4997                                         offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
4998                                         offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block);
4999                                 }
5000                                 SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n",
5001                                     (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK",
5002                                     cum_ack, num_seg, a_rwnd);
5003                                 stcb->asoc.seen_a_sack_this_pkt = 1;
5004                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
5005                                     (num_seg == 0) && (num_nr_seg == 0) &&
5006                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
5007                                     (stcb->asoc.saw_sack_with_frags == 0) &&
5008                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
5009                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
5010                                         /*
5011                                          * We have a SIMPLE sack having no
5012                                          * prior segments and data on sent
5013                                          * queue to be acked. Use the faster
5014                                          * path sack processing. We also
5015                                          * allow window update sacks with no
5016                                          * missing segments to go this way
5017                                          * too.
5018                                          */
5019                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
5020                                             &abort_now, ecne_seen);
5021                                 } else {
5022                                         if ((netp != NULL) && (*netp != NULL)) {
5023                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
5024                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
5025                                                     cum_ack, a_rwnd, ecne_seen);
5026                                         }
5027                                 }
5028                                 if (abort_now) {
5029                                         /* ABORT signal from sack processing */
5030                                         *offset = length;
5031                                         return (NULL);
5032                                 }
5033                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
5034                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
5035                                     (stcb->asoc.stream_queue_cnt == 0)) {
5036                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
5037                                 }
5038                                 break;
5039                         }
5040                 case SCTP_HEARTBEAT_REQUEST:
5041                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
5042                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5043                                 SCTP_STAT_INCR(sctps_recvheartbeat);
5044                                 sctp_send_heartbeat_ack(stcb, m, *offset,
5045                                     chk_length, *netp);
5046                         }
5047                         break;
5048                 case SCTP_HEARTBEAT_ACK:
5049                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n");
5050                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
5051                                 /* Its not ours */
5052                                 *offset = length;
5053                                 return (stcb);
5054                         }
5055                         SCTP_STAT_INCR(sctps_recvheartbeatack);
5056                         if ((netp != NULL) && (*netp != NULL)) {
5057                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
5058                                     stcb, *netp);
5059                         }
5060                         break;
5061                 case SCTP_ABORT_ASSOCIATION:
5062                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
5063                             (void *)stcb);
5064                         *offset = length;
5065                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5066                                 if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) {
5067                                         return (NULL);
5068                                 } else {
5069                                         return (stcb);
5070                                 }
5071                         } else {
5072                                 return (NULL);
5073                         }
5074                         break;
5075                 case SCTP_SHUTDOWN:
5076                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
5077                             (void *)stcb);
5078                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
5079                                 *offset = length;
5080                                 return (stcb);
5081                         }
5082                         if ((netp != NULL) && (*netp != NULL)) {
5083                                 int abort_flag = 0;
5084
5085                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
5086                                     stcb, *netp, &abort_flag);
5087                                 if (abort_flag) {
5088                                         *offset = length;
5089                                         return (NULL);
5090                                 }
5091                         }
5092                         break;
5093                 case SCTP_SHUTDOWN_ACK:
5094                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb);
5095                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5096                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
5097                         }
5098                         *offset = length;
5099                         return (NULL);
5100                         break;
5101                 case SCTP_OPERATION_ERROR:
5102                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n");
5103                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) &&
5104                             sctp_handle_error(ch, stcb, *netp, contiguous) < 0) {
5105                                 *offset = length;
5106                                 return (NULL);
5107                         }
5108                         break;
5109                 case SCTP_COOKIE_ECHO:
5110                         SCTPDBG(SCTP_DEBUG_INPUT3,
5111                             "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb);
5112                         if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) {
5113                                 ;
5114                         } else {
5115                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5116                                         /* We are not interested anymore */
5117                         abend:
5118                                         if (stcb != NULL) {
5119                                                 SCTP_TCB_UNLOCK(stcb);
5120                                         }
5121                                         *offset = length;
5122                                         return (NULL);
5123                                 }
5124                         }
5125                         /*-
5126                          * First are we accepting? We do this again here
5127                          * since it is possible that a previous endpoint WAS
5128                          * listening responded to a INIT-ACK and then
5129                          * closed. We opened and bound.. and are now no
5130                          * longer listening.
5131                          *
5132                          * XXXGL: notes on checking listen queue length.
5133                          * 1) SCTP_IS_LISTENING() doesn't necessarily mean
5134                          *    SOLISTENING(), because a listening "UDP type"
5135                          *    socket isn't listening in terms of the socket
5136                          *    layer.  It is a normal data flow socket, that
5137                          *    can fork off new connections.  Thus, we should
5138                          *    look into sol_qlen only in case we are !UDP.
5139                          * 2) Checking sol_qlen in general requires locking
5140                          *    the socket, and this code lacks that.
5141                          */
5142                         if ((stcb == NULL) &&
5143                             (!SCTP_IS_LISTENING(inp) ||
5144                             (!(inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) &&
5145                             inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) {
5146                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
5147                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
5148                                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
5149                                         sctp_abort_association(inp, stcb, m, iphlen,
5150                                             src, dst, sh, op_err,
5151                                             mflowtype, mflowid,
5152                                             vrf_id, port);
5153                                 }
5154                                 *offset = length;
5155                                 return (NULL);
5156                         } else {
5157                                 struct mbuf *ret_buf;
5158                                 struct sctp_inpcb *linp;
5159
5160                                 if (stcb) {
5161                                         linp = NULL;
5162                                 } else {
5163                                         linp = inp;
5164                                 }
5165
5166                                 if (linp != NULL) {
5167                                         SCTP_ASOC_CREATE_LOCK(linp);
5168                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
5169                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
5170                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
5171                                                 goto abend;
5172                                         }
5173                                 }
5174
5175                                 if (netp != NULL) {
5176                                         struct sctp_tcb *locked_stcb;
5177
5178                                         locked_stcb = stcb;
5179                                         ret_buf =
5180                                             sctp_handle_cookie_echo(m, iphlen,
5181                                             *offset,
5182                                             src, dst,
5183                                             sh,
5184                                             (struct sctp_cookie_echo_chunk *)ch,
5185                                             &inp, &stcb, netp,
5186                                             auth_skipped,
5187                                             auth_offset,
5188                                             auth_len,
5189                                             &locked_stcb,
5190                                             mflowtype,
5191                                             mflowid,
5192                                             vrf_id,
5193                                             port);
5194                                         if ((locked_stcb != NULL) && (locked_stcb != stcb)) {
5195                                                 SCTP_TCB_UNLOCK(locked_stcb);
5196                                         }
5197                                         if (stcb != NULL) {
5198                                                 SCTP_TCB_LOCK_ASSERT(stcb);
5199                                         }
5200                                 } else {
5201                                         ret_buf = NULL;
5202                                 }
5203                                 if (linp != NULL) {
5204                                         SCTP_ASOC_CREATE_UNLOCK(linp);
5205                                 }
5206                                 if (ret_buf == NULL) {
5207                                         if (stcb != NULL) {
5208                                                 SCTP_TCB_UNLOCK(stcb);
5209                                         }
5210                                         SCTPDBG(SCTP_DEBUG_INPUT3,
5211                                             "GAK, null buffer\n");
5212                                         *offset = length;
5213                                         return (NULL);
5214                                 }
5215                                 /* if AUTH skipped, see if it verified... */
5216                                 if (auth_skipped) {
5217                                         got_auth = 1;
5218                                         auth_skipped = 0;
5219                                 }
5220                                 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
5221                                         /*
5222                                          * Restart the timer if we have
5223                                          * pending data
5224                                          */
5225                                         struct sctp_tmit_chunk *chk;
5226
5227                                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
5228                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
5229                                 }
5230                         }
5231                         break;
5232                 case SCTP_COOKIE_ACK:
5233                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb);
5234                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5235                                 return (stcb);
5236                         }
5237                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5238                                 /* We are not interested anymore */
5239                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5240                                         ;
5241                                 } else if (stcb) {
5242 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5243                                         so = SCTP_INP_SO(inp);
5244                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5245                                         SCTP_TCB_UNLOCK(stcb);
5246                                         SCTP_SOCKET_LOCK(so, 1);
5247                                         SCTP_TCB_LOCK(stcb);
5248                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5249 #endif
5250                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5251                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
5252 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5253                                         SCTP_SOCKET_UNLOCK(so, 1);
5254 #endif
5255                                         *offset = length;
5256                                         return (NULL);
5257                                 }
5258                         }
5259                         if ((netp != NULL) && (*netp != NULL)) {
5260                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
5261                         }
5262                         break;
5263                 case SCTP_ECN_ECHO:
5264                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n");
5265                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5266                                 /* Its not ours */
5267                                 *offset = length;
5268                                 return (stcb);
5269                         }
5270                         if (stcb->asoc.ecn_supported == 0) {
5271                                 goto unknown_chunk;
5272                         }
5273                         sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb);
5274                         ecne_seen = 1;
5275                         break;
5276                 case SCTP_ECN_CWR:
5277                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n");
5278                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5279                                 *offset = length;
5280                                 return (stcb);
5281                         }
5282                         if (stcb->asoc.ecn_supported == 0) {
5283                                 goto unknown_chunk;
5284                         }
5285                         sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5286                         break;
5287                 case SCTP_SHUTDOWN_COMPLETE:
5288                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb);
5289                         /* must be first and only chunk */
5290                         if ((num_chunks > 1) ||
5291                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5292                                 *offset = length;
5293                                 return (stcb);
5294                         }
5295                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5296                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5297                                     stcb, *netp);
5298                         }
5299                         *offset = length;
5300                         return (NULL);
5301                         break;
5302                 case SCTP_ASCONF:
5303                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5304                         if (stcb != NULL) {
5305                                 if (stcb->asoc.asconf_supported == 0) {
5306                                         goto unknown_chunk;
5307                                 }
5308                                 sctp_handle_asconf(m, *offset, src,
5309                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5310                                 asconf_cnt++;
5311                         }
5312                         break;
5313                 case SCTP_ASCONF_ACK:
5314                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n");
5315                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5316                                 /* Its not ours */
5317                                 *offset = length;
5318                                 return (stcb);
5319                         }
5320                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5321                                 if (stcb->asoc.asconf_supported == 0) {
5322                                         goto unknown_chunk;
5323                                 }
5324                                 /* He's alive so give him credit */
5325                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5326                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5327                                             stcb->asoc.overall_error_count,
5328                                             0,
5329                                             SCTP_FROM_SCTP_INPUT,
5330                                             __LINE__);
5331                                 }
5332                                 stcb->asoc.overall_error_count = 0;
5333                                 sctp_handle_asconf_ack(m, *offset,
5334                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5335                                 if (abort_no_unlock)
5336                                         return (NULL);
5337                         }
5338                         break;
5339                 case SCTP_FORWARD_CUM_TSN:
5340                 case SCTP_IFORWARD_CUM_TSN:
5341                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD_TSN\n");
5342                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5343                                 /* Its not ours */
5344                                 *offset = length;
5345                                 return (stcb);
5346                         }
5347
5348                         if (stcb != NULL) {
5349                                 int abort_flag = 0;
5350
5351                                 if (stcb->asoc.prsctp_supported == 0) {
5352                                         goto unknown_chunk;
5353                                 }
5354                                 *fwd_tsn_seen = 1;
5355                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5356                                         /* We are not interested anymore */
5357 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5358                                         so = SCTP_INP_SO(inp);
5359                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5360                                         SCTP_TCB_UNLOCK(stcb);
5361                                         SCTP_SOCKET_LOCK(so, 1);
5362                                         SCTP_TCB_LOCK(stcb);
5363                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5364 #endif
5365                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5366                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_31);
5367 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5368                                         SCTP_SOCKET_UNLOCK(so, 1);
5369 #endif
5370                                         *offset = length;
5371                                         return (NULL);
5372                                 }
5373                                 /*
5374                                  * For sending a SACK this looks like DATA
5375                                  * chunks.
5376                                  */
5377                                 stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from;
5378                                 sctp_handle_forward_tsn(stcb,
5379                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5380                                 if (abort_flag) {
5381                                         *offset = length;
5382                                         return (NULL);
5383                                 }
5384                         }
5385                         break;
5386                 case SCTP_STREAM_RESET:
5387                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5388                         if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
5389                                 /* Its not ours */
5390                                 *offset = length;
5391                                 return (stcb);
5392                         }
5393                         if (stcb->asoc.reconfig_supported == 0) {
5394                                 goto unknown_chunk;
5395                         }
5396                         if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5397                                 /* stop processing */
5398                                 *offset = length;
5399                                 return (NULL);
5400                         }
5401                         break;
5402                 case SCTP_PACKET_DROPPED:
5403                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5404                         /* re-get it all please */
5405                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5406                                 /* Its not ours */
5407                                 *offset = length;
5408                                 return (stcb);
5409                         }
5410
5411                         if ((ch != NULL) && (stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5412                                 if (stcb->asoc.pktdrop_supported == 0) {
5413                                         goto unknown_chunk;
5414                                 }
5415                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5416                                     stcb, *netp,
5417                                     min(chk_length, contiguous));
5418                         }
5419                         break;
5420                 case SCTP_AUTHENTICATION:
5421                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5422                         if (stcb == NULL) {
5423                                 /* save the first AUTH for later processing */
5424                                 if (auth_skipped == 0) {
5425                                         auth_offset = *offset;
5426                                         auth_len = chk_length;
5427                                         auth_skipped = 1;
5428                                 }
5429                                 /* skip this chunk (temporarily) */
5430                                 goto next_chunk;
5431                         }
5432                         if (stcb->asoc.auth_supported == 0) {
5433                                 goto unknown_chunk;
5434                         }
5435                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5436                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5437                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5438                                 /* Its not ours */
5439                                 *offset = length;
5440                                 return (stcb);
5441                         }
5442                         if (got_auth == 1) {
5443                                 /* skip this chunk... it's already auth'd */
5444                                 goto next_chunk;
5445                         }
5446                         got_auth = 1;
5447                         if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
5448                             m, *offset)) {
5449                                 /* auth HMAC failed so dump the packet */
5450                                 *offset = length;
5451                                 return (stcb);
5452                         } else {
5453                                 /* remaining chunks are HMAC checked */
5454                                 stcb->asoc.authenticated = 1;
5455                         }
5456                         break;
5457
5458                 default:
5459         unknown_chunk:
5460                         /* it's an unknown chunk! */
5461                         if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
5462                                 struct sctp_gen_error_cause *cause;
5463                                 int len;
5464
5465                                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause),
5466                                     0, M_NOWAIT, 1, MT_DATA);
5467                                 if (op_err != NULL) {
5468                                         len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset));
5469                                         cause = mtod(op_err, struct sctp_gen_error_cause *);
5470                                         cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5471                                         cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause)));
5472                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5473                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
5474                                         if (SCTP_BUF_NEXT(op_err) != NULL) {
5475 #ifdef SCTP_MBUF_LOGGING
5476                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5477                                                         sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY);
5478                                                 }
5479 #endif
5480                                                 sctp_queue_op_err(stcb, op_err);
5481                                         } else {
5482                                                 sctp_m_freem(op_err);
5483                                         }
5484                                 }
5485                         }
5486                         if ((ch->chunk_type & 0x80) == 0) {
5487                                 /* discard this packet */
5488                                 *offset = length;
5489                                 return (stcb);
5490                         }       /* else skip this bad chunk and continue... */
5491                         break;
5492                 }               /* switch (ch->chunk_type) */
5493
5494
5495 next_chunk:
5496                 /* get the next chunk */
5497                 *offset += SCTP_SIZE32(chk_length);
5498                 if (*offset >= length) {
5499                         /* no more data left in the mbuf chain */
5500                         break;
5501                 }
5502                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5503                     sizeof(struct sctp_chunkhdr), chunk_buf);
5504                 if (ch == NULL) {
5505                         *offset = length;
5506                         return (stcb);
5507                 }
5508         }                       /* while */
5509
5510         if ((asconf_cnt > 0) && (stcb != NULL)) {
5511                 sctp_send_asconf_ack(stcb);
5512         }
5513         return (stcb);
5514 }
5515
5516
5517 /*
5518  * common input chunk processing (v4 and v6)
5519  */
5520 void
5521 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5522     struct sockaddr *src, struct sockaddr *dst,
5523     struct sctphdr *sh, struct sctp_chunkhdr *ch,
5524     uint8_t compute_crc,
5525     uint8_t ecn_bits,
5526     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
5527     uint32_t vrf_id, uint16_t port)
5528 {
5529         uint32_t high_tsn;
5530         int fwd_tsn_seen = 0, data_processed = 0;
5531         struct mbuf *m = *mm, *op_err;
5532         char msg[SCTP_DIAG_INFO_LEN];
5533         int un_sent;
5534         int cnt_ctrl_ready = 0;
5535         struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5536         struct sctp_tcb *stcb = NULL;
5537         struct sctp_nets *net = NULL;
5538
5539         SCTP_STAT_INCR(sctps_recvdatagrams);
5540 #ifdef SCTP_AUDITING_ENABLED
5541         sctp_audit_log(0xE0, 1);
5542         sctp_auditing(0, inp, stcb, net);
5543 #endif
5544         if (compute_crc != 0) {
5545                 uint32_t check, calc_check;
5546
5547                 check = sh->checksum;
5548                 sh->checksum = 0;
5549                 calc_check = sctp_calculate_cksum(m, iphlen);
5550                 sh->checksum = check;
5551                 if (calc_check != check) {
5552                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5553                             calc_check, check, (void *)m, length, iphlen);
5554                         stcb = sctp_findassociation_addr(m, offset, src, dst,
5555                             sh, ch, &inp, &net, vrf_id);
5556 #if defined(INET) || defined(INET6)
5557                         if ((ch->chunk_type != SCTP_INITIATION) &&
5558                             (net != NULL) && (net->port != port)) {
5559                                 if (net->port == 0) {
5560                                         /* UDP encapsulation turned on. */
5561                                         net->mtu -= sizeof(struct udphdr);
5562                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5563                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5564                                         }
5565                                 } else if (port == 0) {
5566                                         /* UDP encapsulation turned off. */
5567                                         net->mtu += sizeof(struct udphdr);
5568                                         /* XXX Update smallest_mtu */
5569                                 }
5570                                 net->port = port;
5571                         }
5572 #endif
5573                         if (net != NULL) {
5574                                 net->flowtype = mflowtype;
5575                                 net->flowid = mflowid;
5576                         }
5577                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5578                         if ((inp != NULL) && (stcb != NULL)) {
5579                                 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5580                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5581                         } else if ((inp != NULL) && (stcb == NULL)) {
5582                                 inp_decr = inp;
5583                         }
5584                         SCTP_STAT_INCR(sctps_badsum);
5585                         SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5586                         goto out;
5587                 }
5588         }
5589         /* Destination port of 0 is illegal, based on RFC4960. */
5590         if (sh->dest_port == 0) {
5591                 SCTP_STAT_INCR(sctps_hdrops);
5592                 goto out;
5593         }
5594         stcb = sctp_findassociation_addr(m, offset, src, dst,
5595             sh, ch, &inp, &net, vrf_id);
5596 #if defined(INET) || defined(INET6)
5597         if ((ch->chunk_type != SCTP_INITIATION) &&
5598             (net != NULL) && (net->port != port)) {
5599                 if (net->port == 0) {
5600                         /* UDP encapsulation turned on. */
5601                         net->mtu -= sizeof(struct udphdr);
5602                         if (stcb->asoc.smallest_mtu > net->mtu) {
5603                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5604                         }
5605                 } else if (port == 0) {
5606                         /* UDP encapsulation turned off. */
5607                         net->mtu += sizeof(struct udphdr);
5608                         /* XXX Update smallest_mtu */
5609                 }
5610                 net->port = port;
5611         }
5612 #endif
5613         if (net != NULL) {
5614                 net->flowtype = mflowtype;
5615                 net->flowid = mflowid;
5616         }
5617         if (inp == NULL) {
5618                 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5619                 SCTP_STAT_INCR(sctps_noport);
5620                 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5621                         goto out;
5622                 }
5623                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5624                         sctp_send_shutdown_complete2(src, dst, sh,
5625                             mflowtype, mflowid, fibnum,
5626                             vrf_id, port);
5627                         goto out;
5628                 }
5629                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5630                         goto out;
5631                 }
5632                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5633                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5634                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5635                             (ch->chunk_type != SCTP_INIT))) {
5636                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5637                                     "Out of the blue");
5638                                 sctp_send_abort(m, iphlen, src, dst,
5639                                     sh, 0, op_err,
5640                                     mflowtype, mflowid, fibnum,
5641                                     vrf_id, port);
5642                         }
5643                 }
5644                 goto out;
5645         } else if (stcb == NULL) {
5646                 inp_decr = inp;
5647         }
5648         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5649             (void *)m, iphlen, offset, length, (void *)stcb);
5650         if (stcb) {
5651                 /* always clear this before beginning a packet */
5652                 stcb->asoc.authenticated = 0;
5653                 stcb->asoc.seen_a_sack_this_pkt = 0;
5654                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5655                     (void *)stcb, stcb->asoc.state);
5656
5657                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5658                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5659                         /*-
5660                          * If we hit here, we had a ref count
5661                          * up when the assoc was aborted and the
5662                          * timer is clearing out the assoc, we should
5663                          * NOT respond to any packet.. its OOTB.
5664                          */
5665                         SCTP_TCB_UNLOCK(stcb);
5666                         stcb = NULL;
5667                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5668                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5669                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5670                             msg);
5671                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5672                             mflowtype, mflowid, inp->fibnum,
5673                             vrf_id, port);
5674                         goto out;
5675                 }
5676         }
5677         if (IS_SCTP_CONTROL(ch)) {
5678                 /* process the control portion of the SCTP packet */
5679                 /* sa_ignore NO_NULL_CHK */
5680                 stcb = sctp_process_control(m, iphlen, &offset, length,
5681                     src, dst, sh, ch,
5682                     inp, stcb, &net, &fwd_tsn_seen,
5683                     mflowtype, mflowid, fibnum,
5684                     vrf_id, port);
5685                 if (stcb) {
5686                         /*
5687                          * This covers us if the cookie-echo was there and
5688                          * it changes our INP.
5689                          */
5690                         inp = stcb->sctp_ep;
5691 #if defined(INET) || defined(INET6)
5692                         if ((ch->chunk_type != SCTP_INITIATION) &&
5693                             (net != NULL) && (net->port != port)) {
5694                                 if (net->port == 0) {
5695                                         /* UDP encapsulation turned on. */
5696                                         net->mtu -= sizeof(struct udphdr);
5697                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5698                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5699                                         }
5700                                 } else if (port == 0) {
5701                                         /* UDP encapsulation turned off. */
5702                                         net->mtu += sizeof(struct udphdr);
5703                                         /* XXX Update smallest_mtu */
5704                                 }
5705                                 net->port = port;
5706                         }
5707 #endif
5708                 }
5709         } else {
5710                 /*
5711                  * no control chunks, so pre-process DATA chunks (these
5712                  * checks are taken care of by control processing)
5713                  */
5714
5715                 /*
5716                  * if DATA only packet, and auth is required, then punt...
5717                  * can't have authenticated without any AUTH (control)
5718                  * chunks
5719                  */
5720                 if ((stcb != NULL) &&
5721                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5722                         /* "silently" ignore */
5723                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5724                         SCTP_STAT_INCR(sctps_recvauthmissing);
5725                         goto out;
5726                 }
5727                 if (stcb == NULL) {
5728                         /* out of the blue DATA chunk */
5729                         SCTP_PROBE5(receive, NULL, NULL, m, NULL, sh);
5730                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5731                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5732                             msg);
5733                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5734                             mflowtype, mflowid, fibnum,
5735                             vrf_id, port);
5736                         goto out;
5737                 }
5738                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5739                         /* v_tag mismatch! */
5740                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5741                         SCTP_STAT_INCR(sctps_badvtag);
5742                         goto out;
5743                 }
5744         }
5745
5746         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5747         if (stcb == NULL) {
5748                 /*
5749                  * no valid TCB for this packet, or we found it's a bad
5750                  * packet while processing control, or we're done with this
5751                  * packet (done or skip rest of data), so we drop it...
5752                  */
5753                 goto out;
5754         }
5755
5756         /*
5757          * DATA chunk processing
5758          */
5759         /* plow through the data chunks while length > offset */
5760
5761         /*
5762          * Rest should be DATA only.  Check authentication state if AUTH for
5763          * DATA is required.
5764          */
5765         if ((length > offset) &&
5766             (stcb != NULL) &&
5767             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5768             !stcb->asoc.authenticated) {
5769                 /* "silently" ignore */
5770                 SCTP_STAT_INCR(sctps_recvauthmissing);
5771                 SCTPDBG(SCTP_DEBUG_AUTH1,
5772                     "Data chunk requires AUTH, skipped\n");
5773                 goto trigger_send;
5774         }
5775         if (length > offset) {
5776                 int retval;
5777
5778                 /*
5779                  * First check to make sure our state is correct. We would
5780                  * not get here unless we really did have a tag, so we don't
5781                  * abort if this happens, just dump the chunk silently.
5782                  */
5783                 switch (SCTP_GET_STATE(stcb)) {
5784                 case SCTP_STATE_COOKIE_ECHOED:
5785                         /*
5786                          * we consider data with valid tags in this state
5787                          * shows us the cookie-ack was lost. Imply it was
5788                          * there.
5789                          */
5790                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5791                         break;
5792                 case SCTP_STATE_COOKIE_WAIT:
5793                         /*
5794                          * We consider OOTB any data sent during asoc setup.
5795                          */
5796                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5797                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5798                             msg);
5799                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5800                             mflowtype, mflowid, inp->fibnum,
5801                             vrf_id, port);
5802                         goto out;
5803                         /* sa_ignore NOTREACHED */
5804                         break;
5805                 case SCTP_STATE_EMPTY:  /* should not happen */
5806                 case SCTP_STATE_INUSE:  /* should not happen */
5807                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5808                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5809                 default:
5810                         goto out;
5811                         /* sa_ignore NOTREACHED */
5812                         break;
5813                 case SCTP_STATE_OPEN:
5814                 case SCTP_STATE_SHUTDOWN_SENT:
5815                         break;
5816                 }
5817                 /* plow through the data chunks while length > offset */
5818                 retval = sctp_process_data(mm, iphlen, &offset, length,
5819                     inp, stcb, net, &high_tsn);
5820                 if (retval == 2) {
5821                         /*
5822                          * The association aborted, NO UNLOCK needed since
5823                          * the association is destroyed.
5824                          */
5825                         stcb = NULL;
5826                         goto out;
5827                 }
5828                 data_processed = 1;
5829                 /*
5830                  * Anything important needs to have been m_copy'ed in
5831                  * process_data
5832                  */
5833         }
5834
5835         /* take care of ecn */
5836         if ((data_processed == 1) &&
5837             (stcb->asoc.ecn_supported == 1) &&
5838             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5839                 /* Yep, we need to add a ECNE */
5840                 sctp_send_ecn_echo(stcb, net, high_tsn);
5841         }
5842
5843         if ((data_processed == 0) && (fwd_tsn_seen)) {
5844                 int was_a_gap;
5845                 uint32_t highest_tsn;
5846
5847                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
5848                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
5849                 } else {
5850                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
5851                 }
5852                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
5853                 stcb->asoc.send_sack = 1;
5854                 sctp_sack_check(stcb, was_a_gap);
5855         } else if (fwd_tsn_seen) {
5856                 stcb->asoc.send_sack = 1;
5857         }
5858         /* trigger send of any chunks in queue... */
5859 trigger_send:
5860 #ifdef SCTP_AUDITING_ENABLED
5861         sctp_audit_log(0xE0, 2);
5862         sctp_auditing(1, inp, stcb, net);
5863 #endif
5864         SCTPDBG(SCTP_DEBUG_INPUT1,
5865             "Check for chunk output prw:%d tqe:%d tf=%d\n",
5866             stcb->asoc.peers_rwnd,
5867             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
5868             stcb->asoc.total_flight);
5869         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
5870         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
5871                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
5872         }
5873         if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) ||
5874             cnt_ctrl_ready ||
5875             stcb->asoc.trigger_reset ||
5876             ((un_sent) &&
5877             (stcb->asoc.peers_rwnd > 0 ||
5878             (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
5879                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
5880                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5881                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
5882         }
5883 #ifdef SCTP_AUDITING_ENABLED
5884         sctp_audit_log(0xE0, 3);
5885         sctp_auditing(2, inp, stcb, net);
5886 #endif
5887 out:
5888         if (stcb != NULL) {
5889                 SCTP_TCB_UNLOCK(stcb);
5890         }
5891         if (inp_decr != NULL) {
5892                 /* reduce ref-count */
5893                 SCTP_INP_WLOCK(inp_decr);
5894                 SCTP_INP_DECR_REF(inp_decr);
5895                 SCTP_INP_WUNLOCK(inp_decr);
5896         }
5897         return;
5898 }
5899
5900 #ifdef INET
5901 void
5902 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
5903 {
5904         struct mbuf *m;
5905         int iphlen;
5906         uint32_t vrf_id = 0;
5907         uint8_t ecn_bits;
5908         struct sockaddr_in src, dst;
5909         struct ip *ip;
5910         struct sctphdr *sh;
5911         struct sctp_chunkhdr *ch;
5912         int length, offset;
5913         uint8_t compute_crc;
5914         uint32_t mflowid;
5915         uint8_t mflowtype;
5916         uint16_t fibnum;
5917
5918         iphlen = off;
5919         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
5920                 SCTP_RELEASE_PKT(i_pak);
5921                 return;
5922         }
5923         m = SCTP_HEADER_TO_CHAIN(i_pak);
5924 #ifdef SCTP_MBUF_LOGGING
5925         /* Log in any input mbufs */
5926         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5927                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
5928         }
5929 #endif
5930 #ifdef SCTP_PACKET_LOGGING
5931         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
5932                 sctp_packet_log(m);
5933         }
5934 #endif
5935         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
5936             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
5937             m->m_pkthdr.len,
5938             if_name(m->m_pkthdr.rcvif),
5939             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
5940         mflowid = m->m_pkthdr.flowid;
5941         mflowtype = M_HASHTYPE_GET(m);
5942         fibnum = M_GETFIB(m);
5943         SCTP_STAT_INCR(sctps_recvpackets);
5944         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
5945         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
5946         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5947         if (SCTP_BUF_LEN(m) < offset) {
5948                 if ((m = m_pullup(m, offset)) == NULL) {
5949                         SCTP_STAT_INCR(sctps_hdrops);
5950                         return;
5951                 }
5952         }
5953         ip = mtod(m, struct ip *);
5954         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
5955         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
5956         offset -= sizeof(struct sctp_chunkhdr);
5957         memset(&src, 0, sizeof(struct sockaddr_in));
5958         src.sin_family = AF_INET;
5959         src.sin_len = sizeof(struct sockaddr_in);
5960         src.sin_port = sh->src_port;
5961         src.sin_addr = ip->ip_src;
5962         memset(&dst, 0, sizeof(struct sockaddr_in));
5963         dst.sin_family = AF_INET;
5964         dst.sin_len = sizeof(struct sockaddr_in);
5965         dst.sin_port = sh->dest_port;
5966         dst.sin_addr = ip->ip_dst;
5967         length = ntohs(ip->ip_len);
5968         /* Validate mbuf chain length with IP payload length. */
5969         if (SCTP_HEADER_LEN(m) != length) {
5970                 SCTPDBG(SCTP_DEBUG_INPUT1,
5971                     "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
5972                 SCTP_STAT_INCR(sctps_hdrops);
5973                 goto out;
5974         }
5975         /* SCTP does not allow broadcasts or multicasts */
5976         if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
5977                 goto out;
5978         }
5979         if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
5980                 goto out;
5981         }
5982         ecn_bits = ip->ip_tos;
5983         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
5984                 SCTP_STAT_INCR(sctps_recvhwcrc);
5985                 compute_crc = 0;
5986         } else {
5987                 SCTP_STAT_INCR(sctps_recvswcrc);
5988                 compute_crc = 1;
5989         }
5990         sctp_common_input_processing(&m, iphlen, offset, length,
5991             (struct sockaddr *)&src,
5992             (struct sockaddr *)&dst,
5993             sh, ch,
5994             compute_crc,
5995             ecn_bits,
5996             mflowtype, mflowid, fibnum,
5997             vrf_id, port);
5998 out:
5999         if (m) {
6000                 sctp_m_freem(m);
6001         }
6002         return;
6003 }
6004
6005 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6006 extern int *sctp_cpuarry;
6007 #endif
6008
6009 int
6010 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED)
6011 {
6012         struct mbuf *m;
6013         int off;
6014
6015         m = *mp;
6016         off = *offp;
6017 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6018         if (mp_ncpus > 1) {
6019                 struct ip *ip;
6020                 struct sctphdr *sh;
6021                 int offset;
6022                 int cpu_to_use;
6023                 uint32_t flowid, tag;
6024
6025                 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
6026                         flowid = m->m_pkthdr.flowid;
6027                 } else {
6028                         /*
6029                          * No flow id built by lower layers fix it so we
6030                          * create one.
6031                          */
6032                         offset = off + sizeof(struct sctphdr);
6033                         if (SCTP_BUF_LEN(m) < offset) {
6034                                 if ((m = m_pullup(m, offset)) == NULL) {
6035                                         SCTP_STAT_INCR(sctps_hdrops);
6036                                         return (IPPROTO_DONE);
6037                                 }
6038                         }
6039                         ip = mtod(m, struct ip *);
6040                         sh = (struct sctphdr *)((caddr_t)ip + off);
6041                         tag = htonl(sh->v_tag);
6042                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
6043                         m->m_pkthdr.flowid = flowid;
6044                         M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH);
6045                 }
6046                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
6047                 sctp_queue_to_mcore(m, off, cpu_to_use);
6048                 return (IPPROTO_DONE);
6049         }
6050 #endif
6051         sctp_input_with_port(m, off, 0);
6052         return (IPPROTO_DONE);
6053 }
6054 #endif