sys/netinet/sctp_input.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   5  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   6  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  * a) Redistributions of source code must retain the above copyright notice,
  12  *    this list of conditions and the following disclaimer.
  13  *
  14  * b) Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the distribution.
  17  *
  18  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  19  *    contributors may be used to endorse or promote products derived
  20  *    from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  24  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  32  * THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 __FBSDID("$FreeBSD$");
  37
  38 #include <netinet/sctp_os.h>
  39 #include <netinet/sctp_var.h>
  40 #include <netinet/sctp_sysctl.h>
  41 #include <netinet/sctp_pcb.h>
  42 #include <netinet/sctp_header.h>
  43 #include <netinet/sctputil.h>
  44 #include <netinet/sctp_output.h>
  45 #include <netinet/sctp_input.h>
  46 #include <netinet/sctp_auth.h>
  47 #include <netinet/sctp_indata.h>
  48 #include <netinet/sctp_asconf.h>
  49 #include <netinet/sctp_bsd_addr.h>
  50 #include <netinet/sctp_timer.h>
  51 #include <netinet/sctp_crc32.h>
  52 #include <netinet/sctp_kdtrace.h>
  53 #if defined(INET) || defined(INET6)
  54 #include <netinet/udp.h>
  55 #endif
  56 #include <sys/smp.h>
  57
  58 static void
  59 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb)
  60 {
  61         struct sctp_nets *net;
  62
  63         /*
  64          * This now not only stops all cookie timers it also stops any INIT
  65          * timers as well. This will make sure that the timers are stopped
  66          * in all collision cases.
  67          */
  68         SCTP_TCB_LOCK_ASSERT(stcb);
  69         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
  70                 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) {
  71                         sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE,
  72                             stcb->sctp_ep,
  73                             stcb,
  74                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1);
  75                 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) {
  76                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT,
  77                             stcb->sctp_ep,
  78                             stcb,
  79                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2);
  80                 }
  81         }
  82 }
  83
  84 /* INIT handler */
  85 static void
  86 sctp_handle_init(struct mbuf *m, int iphlen, int offset,
  87     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
  88     struct sctp_init_chunk *cp, struct sctp_inpcb *inp,
  89     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_no_unlock,
  90     uint8_t mflowtype, uint32_t mflowid,
  91     uint32_t vrf_id, uint16_t port)
  92 {
  93         struct sctp_init *init;
  94         struct mbuf *op_err;
  95
  96         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
  97             (void *)stcb);
  98         if (stcb == NULL) {
  99                 SCTP_INP_RLOCK(inp);
 100         }
 101         /* validate length */
 102         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) {
 103                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 104                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 105                     mflowtype, mflowid,
 106                     vrf_id, port);
 107                 if (stcb)
 108                         *abort_no_unlock = 1;
 109                 goto outnow;
 110         }
 111         /* validate parameters */
 112         init = &cp->init;
 113         if (init->initiate_tag == 0) {
 114                 /* protocol error... send abort */
 115                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 116                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 117                     mflowtype, mflowid,
 118                     vrf_id, port);
 119                 if (stcb)
 120                         *abort_no_unlock = 1;
 121                 goto outnow;
 122         }
 123         if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) {
 124                 /* invalid parameter... send abort */
 125                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 126                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 127                     mflowtype, mflowid,
 128                     vrf_id, port);
 129                 if (stcb)
 130                         *abort_no_unlock = 1;
 131                 goto outnow;
 132         }
 133         if (init->num_inbound_streams == 0) {
 134                 /* protocol error... send abort */
 135                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 136                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 137                     mflowtype, mflowid,
 138                     vrf_id, port);
 139                 if (stcb)
 140                         *abort_no_unlock = 1;
 141                 goto outnow;
 142         }
 143         if (init->num_outbound_streams == 0) {
 144                 /* protocol error... send abort */
 145                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 146                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 147                     mflowtype, mflowid,
 148                     vrf_id, port);
 149                 if (stcb)
 150                         *abort_no_unlock = 1;
 151                 goto outnow;
 152         }
 153         if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
 154             offset + ntohs(cp->ch.chunk_length))) {
 155                 /* auth parameter(s) error... send abort */
 156                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 157                     "Problem with AUTH parameters");
 158                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 159                     mflowtype, mflowid,
 160                     vrf_id, port);
 161                 if (stcb)
 162                         *abort_no_unlock = 1;
 163                 goto outnow;
 164         }
 165         /* We are only accepting if we have a listening socket. */
 166         if ((stcb == NULL) &&
 167             ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
 168             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
 169             (!SCTP_IS_LISTENING(inp)))) {
 170                 /*
 171                  * FIX ME ?? What about TCP model and we have a
 172                  * match/restart case? Actually no fix is needed. the lookup
 173                  * will always find the existing assoc so stcb would not be
 174                  * NULL. It may be questionable to do this since we COULD
 175                  * just send back the INIT-ACK and hope that the app did
 176                  * accept()'s by the time the COOKIE was sent. But there is
 177                  * a price to pay for COOKIE generation and I don't want to
 178                  * pay it on the chance that the app will actually do some
 179                  * accepts(). The App just looses and should NOT be in this
 180                  * state :-)
 181                  */
 182                 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) {
 183                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 184                             "No listener");
 185                         sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
 186                             mflowtype, mflowid, inp->fibnum,
 187                             vrf_id, port);
 188                 }
 189                 goto outnow;
 190         }
 191         if ((stcb != NULL) &&
 192             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 193                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n");
 194                 sctp_send_shutdown_ack(stcb, NULL);
 195                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
 196         } else {
 197                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
 198                 sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset,
 199                     src, dst, sh, cp,
 200                     mflowtype, mflowid,
 201                     vrf_id, port);
 202         }
 203 outnow:
 204         if (stcb == NULL) {
 205                 SCTP_INP_RUNLOCK(inp);
 206         }
 207 }
 208
 209 /*
 210  * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
 211  */
 212
 213 int
 214 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked)
 215 {
 216         int unsent_data;
 217         unsigned int i;
 218         struct sctp_stream_queue_pending *sp;
 219         struct sctp_association *asoc;
 220
 221         /*
 222          * This function returns if any stream has true unsent data on it.
 223          * Note that as it looks through it will clean up any places that
 224          * have old data that has been sent but left at top of stream queue.
 225          */
 226         asoc = &stcb->asoc;
 227         unsent_data = 0;
 228         SCTP_TCB_SEND_LOCK(stcb);
 229         if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
 230                 /* Check to see if some data queued */
 231                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 232                         /* sa_ignore FREED_MEMORY */
 233                         sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
 234                         if (sp == NULL) {
 235                                 continue;
 236                         }
 237                         if ((sp->msg_is_complete) &&
 238                             (sp->length == 0) &&
 239                             (sp->sender_all_done)) {
 240                                 /*
 241                                  * We are doing differed cleanup. Last time
 242                                  * through when we took all the data the
 243                                  * sender_all_done was not set.
 244                                  */
 245                                 if (sp->put_last_out == 0) {
 246                                         SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
 247                                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
 248                                             sp->sender_all_done,
 249                                             sp->length,
 250                                             sp->msg_is_complete,
 251                                             sp->put_last_out);
 252                                 }
 253                                 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 254                                 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
 255                                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp, 1);
 256                                 if (sp->net) {
 257                                         sctp_free_remote_addr(sp->net);
 258                                         sp->net = NULL;
 259                                 }
 260                                 if (sp->data) {
 261                                         sctp_m_freem(sp->data);
 262                                         sp->data = NULL;
 263                                 }
 264                                 sctp_free_a_strmoq(stcb, sp, so_locked);
 265                                 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
 266                                         unsent_data++;
 267                                 }
 268                         } else {
 269                                 unsent_data++;
 270                         }
 271                         if (unsent_data > 0) {
 272                                 break;
 273                         }
 274                 }
 275         }
 276         SCTP_TCB_SEND_UNLOCK(stcb);
 277         return (unsent_data);
 278 }
 279
 280 static int
 281 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb)
 282 {
 283         struct sctp_init *init;
 284         struct sctp_association *asoc;
 285         struct sctp_nets *lnet;
 286         unsigned int i;
 287
 288         init = &cp->init;
 289         asoc = &stcb->asoc;
 290         /* save off parameters */
 291         asoc->peer_vtag = ntohl(init->initiate_tag);
 292         asoc->peers_rwnd = ntohl(init->a_rwnd);
 293         /* init tsn's */
 294         asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
 295
 296         if (!TAILQ_EMPTY(&asoc->nets)) {
 297                 /* update any ssthresh's that may have a default */
 298                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
 299                         lnet->ssthresh = asoc->peers_rwnd;
 300                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
 301                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
 302                         }
 303                 }
 304         }
 305         SCTP_TCB_SEND_LOCK(stcb);
 306         if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
 307                 unsigned int newcnt;
 308                 struct sctp_stream_out *outs;
 309                 struct sctp_stream_queue_pending *sp, *nsp;
 310                 struct sctp_tmit_chunk *chk, *nchk;
 311
 312                 /* abandon the upper streams */
 313                 newcnt = ntohs(init->num_inbound_streams);
 314                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
 315                         if (chk->rec.data.sid >= newcnt) {
 316                                 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
 317                                 asoc->send_queue_cnt--;
 318                                 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) {
 319                                         asoc->strmout[chk->rec.data.sid].chunks_on_queues--;
 320 #ifdef INVARIANTS
 321                                 } else {
 322                                         panic("No chunks on the queues for sid %u.", chk->rec.data.sid);
 323 #endif
 324                                 }
 325                                 if (chk->data != NULL) {
 326                                         sctp_free_bufspace(stcb, asoc, chk, 1);
 327                                         sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb,
 328                                             0, chk, SCTP_SO_NOT_LOCKED);
 329                                         if (chk->data) {
 330                                                 sctp_m_freem(chk->data);
 331                                                 chk->data = NULL;
 332                                         }
 333                                 }
 334                                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 335                                 /* sa_ignore FREED_MEMORY */
 336                         }
 337                 }
 338                 if (asoc->strmout) {
 339                         for (i = newcnt; i < asoc->pre_open_streams; i++) {
 340                                 outs = &asoc->strmout[i];
 341                                 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
 342                                         atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 343                                         TAILQ_REMOVE(&outs->outqueue, sp, next);
 344                                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp, 1);
 345                                         sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
 346                                             stcb, 0, sp, SCTP_SO_NOT_LOCKED);
 347                                         if (sp->data) {
 348                                                 sctp_m_freem(sp->data);
 349                                                 sp->data = NULL;
 350                                         }
 351                                         if (sp->net) {
 352                                                 sctp_free_remote_addr(sp->net);
 353                                                 sp->net = NULL;
 354                                         }
 355                                         /* Free the chunk */
 356                                         sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
 357                                         /* sa_ignore FREED_MEMORY */
 358                                 }
 359                                 outs->state = SCTP_STREAM_CLOSED;
 360                         }
 361                 }
 362                 /* cut back the count */
 363                 asoc->pre_open_streams = newcnt;
 364         }
 365         SCTP_TCB_SEND_UNLOCK(stcb);
 366         asoc->streamoutcnt = asoc->pre_open_streams;
 367         if (asoc->strmout) {
 368                 for (i = 0; i < asoc->streamoutcnt; i++) {
 369                         asoc->strmout[i].state = SCTP_STREAM_OPEN;
 370                 }
 371         }
 372         /* EY - nr_sack: initialize highest tsn in nr_mapping_array */
 373         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
 374         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
 375                 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 376         }
 377         /* This is the next one we expect */
 378         asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
 379
 380         asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
 381         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
 382
 383         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
 384         /* open the requested streams */
 385
 386         if (asoc->strmin != NULL) {
 387                 /* Free the old ones */
 388                 for (i = 0; i < asoc->streamincnt; i++) {
 389                         sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue);
 390                         sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue);
 391                 }
 392                 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
 393         }
 394         if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) {
 395                 asoc->streamincnt = ntohs(init->num_outbound_streams);
 396         } else {
 397                 asoc->streamincnt = asoc->max_inbound_streams;
 398         }
 399         SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
 400             sizeof(struct sctp_stream_in), SCTP_M_STRMI);
 401         if (asoc->strmin == NULL) {
 402                 /* we didn't get memory for the streams! */
 403                 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
 404                 return (-1);
 405         }
 406         for (i = 0; i < asoc->streamincnt; i++) {
 407                 asoc->strmin[i].sid = i;
 408                 asoc->strmin[i].last_mid_delivered = 0xffffffff;
 409                 TAILQ_INIT(&asoc->strmin[i].inqueue);
 410                 TAILQ_INIT(&asoc->strmin[i].uno_inqueue);
 411                 asoc->strmin[i].pd_api_started = 0;
 412                 asoc->strmin[i].delivery_started = 0;
 413         }
 414         /*
 415          * load_address_from_init will put the addresses into the
 416          * association when the COOKIE is processed or the INIT-ACK is
 417          * processed. Both types of COOKIE's existing and new call this
 418          * routine. It will remove addresses that are no longer in the
 419          * association (for the restarting case where addresses are
 420          * removed). Up front when the INIT arrives we will discard it if it
 421          * is a restart and new addresses have been added.
 422          */
 423         /* sa_ignore MEMLEAK */
 424         return (0);
 425 }
 426
 427 /*
 428  * INIT-ACK message processing/consumption returns value < 0 on error
 429  */
 430 static int
 431 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
 432     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
 433     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
 434     struct sctp_nets *net, int *abort_no_unlock,
 435     uint8_t mflowtype, uint32_t mflowid,
 436     uint32_t vrf_id)
 437 {
 438         struct sctp_association *asoc;
 439         struct mbuf *op_err;
 440         int retval, abort_flag, cookie_found;
 441         int initack_limit;
 442         int nat_friendly = 0;
 443
 444         /* First verify that we have no illegal param's */
 445         abort_flag = 0;
 446         cookie_found = 0;
 447
 448         op_err = sctp_arethere_unrecognized_parameters(m,
 449             (offset + sizeof(struct sctp_init_chunk)),
 450             &abort_flag, (struct sctp_chunkhdr *)cp,
 451             &nat_friendly, &cookie_found);
 452         if (abort_flag) {
 453                 /* Send an abort and notify peer */
 454                 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
 455                 *abort_no_unlock = 1;
 456                 return (-1);
 457         }
 458         if (!cookie_found) {
 459                 uint16_t len;
 460
 461                 /* Only report the missing cookie parameter */
 462                 if (op_err != NULL) {
 463                         sctp_m_freem(op_err);
 464                 }
 465                 len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t));
 466                 /* We abort with an error of missing mandatory param */
 467                 op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA);
 468                 if (op_err != NULL) {
 469                         struct sctp_error_missing_param *cause;
 470
 471                         SCTP_BUF_LEN(op_err) = len;
 472                         cause = mtod(op_err, struct sctp_error_missing_param *);
 473                         /* Subtract the reserved param */
 474                         cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM);
 475                         cause->cause.length = htons(len);
 476                         cause->num_missing_params = htonl(1);
 477                         cause->type[0] = htons(SCTP_STATE_COOKIE);
 478                 }
 479                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 480                     src, dst, sh, op_err,
 481                     mflowtype, mflowid,
 482                     vrf_id, net->port);
 483                 *abort_no_unlock = 1;
 484                 return (-3);
 485         }
 486         asoc = &stcb->asoc;
 487         asoc->peer_supports_nat = (uint8_t)nat_friendly;
 488         /* process the peer's parameters in the INIT-ACK */
 489         retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb);
 490         if (retval < 0) {
 491                 if (op_err != NULL) {
 492                         sctp_m_freem(op_err);
 493                 }
 494                 return (retval);
 495         }
 496         initack_limit = offset + ntohs(cp->ch.chunk_length);
 497         /* load all addresses */
 498         if ((retval = sctp_load_addresses_from_init(stcb, m,
 499             (offset + sizeof(struct sctp_init_chunk)), initack_limit,
 500             src, dst, NULL, stcb->asoc.port))) {
 501                 if (op_err != NULL) {
 502                         sctp_m_freem(op_err);
 503                 }
 504                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 505                     "Problem with address parameters");
 506                 SCTPDBG(SCTP_DEBUG_INPUT1,
 507                     "Load addresses from INIT causes an abort %d\n",
 508                     retval);
 509                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 510                     src, dst, sh, op_err,
 511                     mflowtype, mflowid,
 512                     vrf_id, net->port);
 513                 *abort_no_unlock = 1;
 514                 return (-1);
 515         }
 516         /* if the peer doesn't support asconf, flush the asconf queue */
 517         if (asoc->asconf_supported == 0) {
 518                 struct sctp_asconf_addr *param, *nparam;
 519
 520                 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
 521                         TAILQ_REMOVE(&asoc->asconf_queue, param, next);
 522                         SCTP_FREE(param, SCTP_M_ASC_ADDR);
 523                 }
 524         }
 525
 526         stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
 527             stcb->asoc.local_hmacs);
 528         if (op_err) {
 529                 sctp_queue_op_err(stcb, op_err);
 530                 /* queuing will steal away the mbuf chain to the out queue */
 531                 op_err = NULL;
 532         }
 533         /* extract the cookie and queue it to "echo" it back... */
 534         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 535                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 536                     stcb->asoc.overall_error_count,
 537                     0,
 538                     SCTP_FROM_SCTP_INPUT,
 539                     __LINE__);
 540         }
 541         stcb->asoc.overall_error_count = 0;
 542         net->error_count = 0;
 543
 544         /*
 545          * Cancel the INIT timer, We do this first before queueing the
 546          * cookie. We always cancel at the primary to assue that we are
 547          * canceling the timer started by the INIT which always goes to the
 548          * primary.
 549          */
 550         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
 551             asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 552
 553         /* calculate the RTO */
 554         sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered,
 555             SCTP_RTT_FROM_NON_DATA);
 556         retval = sctp_send_cookie_echo(m, offset, initack_limit, stcb, net);
 557         return (retval);
 558 }
 559
 560 static void
 561 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
 562     struct sctp_tcb *stcb, struct sctp_nets *net)
 563 {
 564         union sctp_sockstore store;
 565         struct sctp_nets *r_net, *f_net;
 566         struct timeval tv;
 567         int req_prim = 0;
 568         uint16_t old_error_counter;
 569
 570         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
 571                 /* Invalid length */
 572                 return;
 573         }
 574
 575         memset(&store, 0, sizeof(store));
 576         switch (cp->heartbeat.hb_info.addr_family) {
 577 #ifdef INET
 578         case AF_INET:
 579                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
 580                         store.sin.sin_family = cp->heartbeat.hb_info.addr_family;
 581                         store.sin.sin_len = cp->heartbeat.hb_info.addr_len;
 582                         store.sin.sin_port = stcb->rport;
 583                         memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address,
 584                             sizeof(store.sin.sin_addr));
 585                 } else {
 586                         return;
 587                 }
 588                 break;
 589 #endif
 590 #ifdef INET6
 591         case AF_INET6:
 592                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
 593                         store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family;
 594                         store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len;
 595                         store.sin6.sin6_port = stcb->rport;
 596                         memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr));
 597                 } else {
 598                         return;
 599                 }
 600                 break;
 601 #endif
 602         default:
 603                 return;
 604         }
 605         r_net = sctp_findnet(stcb, &store.sa);
 606         if (r_net == NULL) {
 607                 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
 608                 return;
 609         }
 610         if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 611             (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
 612             (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
 613                 /*
 614                  * If the its a HB and it's random value is correct when can
 615                  * confirm the destination.
 616                  */
 617                 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 618                 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
 619                         stcb->asoc.primary_destination = r_net;
 620                         r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
 621                         f_net = TAILQ_FIRST(&stcb->asoc.nets);
 622                         if (f_net != r_net) {
 623                                 /*
 624                                  * first one on the list is NOT the primary
 625                                  * sctp_cmpaddr() is much more efficient if
 626                                  * the primary is the first on the list,
 627                                  * make it so.
 628                                  */
 629                                 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
 630                                 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
 631                         }
 632                         req_prim = 1;
 633                 }
 634                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 635                     stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 636                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb,
 637                     r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
 638                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 639         }
 640         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 641                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 642                     stcb->asoc.overall_error_count,
 643                     0,
 644                     SCTP_FROM_SCTP_INPUT,
 645                     __LINE__);
 646         }
 647         stcb->asoc.overall_error_count = 0;
 648         old_error_counter = r_net->error_count;
 649         r_net->error_count = 0;
 650         r_net->hb_responded = 1;
 651         tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
 652         tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
 653         /* Now lets do a RTO with this */
 654         sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv,
 655             SCTP_RTT_FROM_NON_DATA);
 656         if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
 657                 r_net->dest_state |= SCTP_ADDR_REACHABLE;
 658                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
 659                     0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 660         }
 661         if (r_net->dest_state & SCTP_ADDR_PF) {
 662                 r_net->dest_state &= ~SCTP_ADDR_PF;
 663                 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
 664         }
 665         if (old_error_counter > 0) {
 666                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
 667                     stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5);
 668                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 669         }
 670         if (r_net == stcb->asoc.primary_destination) {
 671                 if (stcb->asoc.alternate) {
 672                         /* release the alternate, primary is good */
 673                         sctp_free_remote_addr(stcb->asoc.alternate);
 674                         stcb->asoc.alternate = NULL;
 675                 }
 676         }
 677         /* Mobility adaptation */
 678         if (req_prim) {
 679                 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
 680                     SCTP_MOBILITY_BASE) ||
 681                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 682                     SCTP_MOBILITY_FASTHANDOFF)) &&
 683                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 684                     SCTP_MOBILITY_PRIM_DELETED)) {
 685                         sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED,
 686                             stcb->sctp_ep, stcb, NULL,
 687                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 688                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 689                             SCTP_MOBILITY_FASTHANDOFF)) {
 690                                 sctp_assoc_immediate_retrans(stcb,
 691                                     stcb->asoc.primary_destination);
 692                         }
 693                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 694                             SCTP_MOBILITY_BASE)) {
 695                                 sctp_move_chunks_from_net(stcb,
 696                                     stcb->asoc.deleted_primary);
 697                         }
 698                         sctp_delete_prim_timer(stcb->sctp_ep, stcb);
 699                 }
 700         }
 701 }
 702
 703 static int
 704 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
 705 {
 706         /*
 707          * Return 0 means we want you to proceed with the abort non-zero
 708          * means no abort processing.
 709          */
 710         uint32_t new_vtag;
 711         struct sctpasochead *head;
 712
 713         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
 714             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
 715                 new_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 716                 atomic_add_int(&stcb->asoc.refcnt, 1);
 717                 SCTP_TCB_UNLOCK(stcb);
 718                 SCTP_INP_INFO_WLOCK();
 719                 SCTP_TCB_LOCK(stcb);
 720                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 721         } else {
 722                 return (0);
 723         }
 724         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) {
 725                 /* generate a new vtag and send init */
 726                 LIST_REMOVE(stcb, sctp_asocs);
 727                 stcb->asoc.my_vtag = new_vtag;
 728                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 729                 /*
 730                  * put it in the bucket in the vtag hash of assoc's for the
 731                  * system
 732                  */
 733                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 734                 SCTP_INP_INFO_WUNLOCK();
 735                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 736                 return (1);
 737         } else {
 738                 /*
 739                  * treat like a case where the cookie expired i.e.: - dump
 740                  * current cookie. - generate a new vtag. - resend init.
 741                  */
 742                 /* generate a new vtag and send init */
 743                 LIST_REMOVE(stcb, sctp_asocs);
 744                 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
 745                 sctp_stop_all_cookie_timers(stcb);
 746                 sctp_toss_old_cookies(stcb, &stcb->asoc);
 747                 stcb->asoc.my_vtag = new_vtag;
 748                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 749                 /*
 750                  * put it in the bucket in the vtag hash of assoc's for the
 751                  * system
 752                  */
 753                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 754                 SCTP_INP_INFO_WUNLOCK();
 755                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 756                 return (1);
 757         }
 758         return (0);
 759 }
 760
 761 static int
 762 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
 763     struct sctp_nets *net)
 764 {
 765         /*
 766          * return 0 means we want you to proceed with the abort non-zero
 767          * means no abort processing
 768          */
 769         if (stcb->asoc.auth_supported == 0) {
 770                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
 771                 return (0);
 772         }
 773         sctp_asconf_send_nat_state_update(stcb, net);
 774         return (1);
 775 }
 776
 777 /* Returns 1 if the stcb was aborted, 0 otherwise */
 778 static int
 779 sctp_handle_abort(struct sctp_abort_chunk *abort,
 780     struct sctp_tcb *stcb, struct sctp_nets *net)
 781 {
 782         uint16_t len;
 783         uint16_t error;
 784
 785         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
 786         if (stcb == NULL)
 787                 return (0);
 788
 789         len = ntohs(abort->ch.chunk_length);
 790         if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) {
 791                 /*
 792                  * Need to check the cause codes for our two magic nat
 793                  * aborts which don't kill the assoc necessarily.
 794                  */
 795                 struct sctp_error_cause *cause;
 796
 797                 cause = (struct sctp_error_cause *)(abort + 1);
 798                 error = ntohs(cause->code);
 799                 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) {
 800                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ABORT flags:%x\n",
 801                             abort->ch.chunk_flags);
 802                         if (sctp_handle_nat_colliding_state(stcb)) {
 803                                 return (0);
 804                         }
 805                 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) {
 806                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ABORT flags:%x\n",
 807                             abort->ch.chunk_flags);
 808                         if (sctp_handle_nat_missing_state(stcb, net)) {
 809                                 return (0);
 810                         }
 811                 }
 812         } else {
 813                 error = 0;
 814         }
 815         /* stop any receive timers */
 816         sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL,
 817             SCTP_FROM_SCTP_INPUT + SCTP_LOC_7);
 818         /* notify user of the abort and clean up... */
 819         sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED);
 820         /* free the tcb */
 821         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
 822         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
 823             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 824                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 825         }
 826 #ifdef SCTP_ASOCLOG_OF_TSNS
 827         sctp_print_out_track_log(stcb);
 828 #endif
 829         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 830             SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
 831         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
 832         return (1);
 833 }
 834
 835 static void
 836 sctp_start_net_timers(struct sctp_tcb *stcb)
 837 {
 838         uint32_t cnt_hb_sent;
 839         struct sctp_nets *net;
 840
 841         cnt_hb_sent = 0;
 842         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 843                 /*
 844                  * For each network start: 1) A pmtu timer. 2) A HB timer 3)
 845                  * If the dest in unconfirmed send a hb as well if under
 846                  * max_hb_burst have been sent.
 847                  */
 848                 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
 849                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
 850                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
 851                     (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
 852                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 853                         cnt_hb_sent++;
 854                 }
 855         }
 856         if (cnt_hb_sent) {
 857                 sctp_chunk_output(stcb->sctp_ep, stcb,
 858                     SCTP_OUTPUT_FROM_COOKIE_ACK,
 859                     SCTP_SO_NOT_LOCKED);
 860         }
 861 }
 862
 863 static void
 864 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
 865     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
 866 {
 867         struct sctp_association *asoc;
 868         int some_on_streamwheel;
 869         int old_state;
 870
 871         SCTPDBG(SCTP_DEBUG_INPUT2,
 872             "sctp_handle_shutdown: handling SHUTDOWN\n");
 873         if (stcb == NULL)
 874                 return;
 875         asoc = &stcb->asoc;
 876         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
 877             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
 878                 return;
 879         }
 880         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
 881                 /* Shutdown NOT the expected size */
 882                 return;
 883         }
 884         old_state = SCTP_GET_STATE(stcb);
 885         sctp_update_acked(stcb, cp, abort_flag);
 886         if (*abort_flag) {
 887                 return;
 888         }
 889         if (asoc->control_pdapi) {
 890                 /*
 891                  * With a normal shutdown we assume the end of last record.
 892                  */
 893                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 894                 if (asoc->control_pdapi->on_strm_q) {
 895                         struct sctp_stream_in *strm;
 896
 897                         strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream];
 898                         if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) {
 899                                 /* Unordered */
 900                                 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm);
 901                                 asoc->control_pdapi->on_strm_q = 0;
 902                         } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) {
 903                                 /* Ordered */
 904                                 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm);
 905                                 asoc->control_pdapi->on_strm_q = 0;
 906 #ifdef INVARIANTS
 907                         } else {
 908                                 panic("Unknown state on ctrl:%p on_strm_q:%d",
 909                                     asoc->control_pdapi,
 910                                     asoc->control_pdapi->on_strm_q);
 911 #endif
 912                         }
 913                 }
 914                 asoc->control_pdapi->end_added = 1;
 915                 asoc->control_pdapi->pdapi_aborted = 1;
 916                 asoc->control_pdapi = NULL;
 917                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 918                 if (stcb->sctp_socket) {
 919                         sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 920                 }
 921         }
 922         /* goto SHUTDOWN_RECEIVED state to block new requests */
 923         if (stcb->sctp_socket) {
 924                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 925                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
 926                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) {
 927                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_RECEIVED);
 928                         /*
 929                          * notify upper layer that peer has initiated a
 930                          * shutdown
 931                          */
 932                         sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 933
 934                         /* reset time */
 935                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
 936                 }
 937         }
 938         if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) {
 939                 /*
 940                  * stop the shutdown timer, since we WILL move to
 941                  * SHUTDOWN-ACK-SENT.
 942                  */
 943                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
 944                     net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
 945         }
 946         /* Now is there unsent data on a stream somewhere? */
 947         some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
 948
 949         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 950             !TAILQ_EMPTY(&asoc->sent_queue) ||
 951             some_on_streamwheel) {
 952                 /* By returning we will push more data out */
 953                 return;
 954         } else {
 955                 /* no outstanding data to send, so move on... */
 956                 /* send SHUTDOWN-ACK */
 957                 /* move to SHUTDOWN-ACK-SENT state */
 958                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
 959                     (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 960                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 961                 }
 962                 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
 963                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_ACK_SENT);
 964                         sctp_stop_timers_for_shutdown(stcb);
 965                         sctp_send_shutdown_ack(stcb, net);
 966                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
 967                             stcb->sctp_ep, stcb, net);
 968                 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) {
 969                         sctp_send_shutdown_ack(stcb, net);
 970                 }
 971         }
 972 }
 973
 974 static void
 975 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
 976     struct sctp_tcb *stcb,
 977     struct sctp_nets *net)
 978 {
 979         struct sctp_association *asoc;
 980
 981         SCTPDBG(SCTP_DEBUG_INPUT2,
 982             "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
 983         if (stcb == NULL)
 984                 return;
 985
 986         asoc = &stcb->asoc;
 987         /* process according to association state */
 988         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
 989             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
 990                 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
 991                 sctp_send_shutdown_complete(stcb, net, 1);
 992                 SCTP_TCB_UNLOCK(stcb);
 993                 return;
 994         }
 995         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
 996             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 997                 /* unexpected SHUTDOWN-ACK... so ignore... */
 998                 SCTP_TCB_UNLOCK(stcb);
 999                 return;
1000         }
1001         if (asoc->control_pdapi) {
1002                 /*
1003                  * With a normal shutdown we assume the end of last record.
1004                  */
1005                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
1006                 asoc->control_pdapi->end_added = 1;
1007                 asoc->control_pdapi->pdapi_aborted = 1;
1008                 asoc->control_pdapi = NULL;
1009                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
1010                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
1011         }
1012 #ifdef INVARIANTS
1013         if (!TAILQ_EMPTY(&asoc->send_queue) ||
1014             !TAILQ_EMPTY(&asoc->sent_queue) ||
1015             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
1016                 panic("Queues are not empty when handling SHUTDOWN-ACK");
1017         }
1018 #endif
1019         /* stop the timer */
1020         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net,
1021             SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
1022         /* send SHUTDOWN-COMPLETE */
1023         sctp_send_shutdown_complete(stcb, net, 0);
1024         /* notify upper layer protocol */
1025         if (stcb->sctp_socket) {
1026                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1027                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
1028                         stcb->sctp_socket->so_snd.sb_cc = 0;
1029                 }
1030                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
1031         }
1032         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1033         /* free the TCB but first save off the ep */
1034         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1035             SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1036 }
1037
1038 static void
1039 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type)
1040 {
1041         switch (chunk_type) {
1042         case SCTP_ASCONF_ACK:
1043         case SCTP_ASCONF:
1044                 sctp_asconf_cleanup(stcb);
1045                 break;
1046         case SCTP_IFORWARD_CUM_TSN:
1047         case SCTP_FORWARD_CUM_TSN:
1048                 stcb->asoc.prsctp_supported = 0;
1049                 break;
1050         default:
1051                 SCTPDBG(SCTP_DEBUG_INPUT2,
1052                     "Peer does not support chunk type %d (0x%x).\n",
1053                     chunk_type, chunk_type);
1054                 break;
1055         }
1056 }
1057
1058 /*
1059  * Skip past the param header and then we will find the param that caused the
1060  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1061  * these will turn of specific features.
1062  * XXX: Is this the right thing to do?
1063  */
1064 static void
1065 sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type)
1066 {
1067         switch (parameter_type) {
1068                 /* pr-sctp draft */
1069         case SCTP_PRSCTP_SUPPORTED:
1070                 stcb->asoc.prsctp_supported = 0;
1071                 break;
1072         case SCTP_SUPPORTED_CHUNK_EXT:
1073                 break;
1074                 /* draft-ietf-tsvwg-addip-sctp */
1075         case SCTP_HAS_NAT_SUPPORT:
1076                 stcb->asoc.peer_supports_nat = 0;
1077                 break;
1078         case SCTP_ADD_IP_ADDRESS:
1079         case SCTP_DEL_IP_ADDRESS:
1080         case SCTP_SET_PRIM_ADDR:
1081                 stcb->asoc.asconf_supported = 0;
1082                 break;
1083         case SCTP_SUCCESS_REPORT:
1084         case SCTP_ERROR_CAUSE_IND:
1085                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1086                 SCTPDBG(SCTP_DEBUG_INPUT2,
1087                     "Turning off ASCONF to this strange peer\n");
1088                 stcb->asoc.asconf_supported = 0;
1089                 break;
1090         default:
1091                 SCTPDBG(SCTP_DEBUG_INPUT2,
1092                     "Peer does not support param type %d (0x%x)??\n",
1093                     parameter_type, parameter_type);
1094                 break;
1095         }
1096 }
1097
1098 static int
1099 sctp_handle_error(struct sctp_chunkhdr *ch,
1100     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
1101 {
1102         struct sctp_error_cause *cause;
1103         struct sctp_association *asoc;
1104         uint32_t remaining_length, adjust;
1105         uint16_t code, cause_code, cause_length;
1106
1107         /* parse through all of the errors and process */
1108         asoc = &stcb->asoc;
1109         cause = (struct sctp_error_cause *)((caddr_t)ch +
1110             sizeof(struct sctp_chunkhdr));
1111         remaining_length = ntohs(ch->chunk_length);
1112         if (remaining_length > limit) {
1113                 remaining_length = limit;
1114         }
1115         if (remaining_length >= sizeof(struct sctp_chunkhdr)) {
1116                 remaining_length -= sizeof(struct sctp_chunkhdr);
1117         } else {
1118                 remaining_length = 0;
1119         }
1120         code = 0;
1121         while (remaining_length >= sizeof(struct sctp_error_cause)) {
1122                 /* Process an Error Cause */
1123                 cause_code = ntohs(cause->code);
1124                 cause_length = ntohs(cause->length);
1125                 if ((cause_length > remaining_length) || (cause_length == 0)) {
1126                         /* Invalid cause length, possibly due to truncation. */
1127                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n",
1128                             remaining_length, cause_length);
1129                         return (0);
1130                 }
1131                 if (code == 0) {
1132                         /* report the first error cause */
1133                         code = cause_code;
1134                 }
1135                 switch (cause_code) {
1136                 case SCTP_CAUSE_INVALID_STREAM:
1137                 case SCTP_CAUSE_MISSING_PARAM:
1138                 case SCTP_CAUSE_INVALID_PARAM:
1139                 case SCTP_CAUSE_NO_USER_DATA:
1140                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n",
1141                             cause_code);
1142                         break;
1143                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1144                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ERROR flags: %x\n",
1145                             ch->chunk_flags);
1146                         if (sctp_handle_nat_colliding_state(stcb)) {
1147                                 return (0);
1148                         }
1149                         break;
1150                 case SCTP_CAUSE_NAT_MISSING_STATE:
1151                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ERROR flags: %x\n",
1152                             ch->chunk_flags);
1153                         if (sctp_handle_nat_missing_state(stcb, net)) {
1154                                 return (0);
1155                         }
1156                         break;
1157                 case SCTP_CAUSE_STALE_COOKIE:
1158                         /*
1159                          * We only act if we have echoed a cookie and are
1160                          * waiting.
1161                          */
1162                         if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) &&
1163                             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
1164                                 struct sctp_error_stale_cookie *stale_cookie;
1165
1166                                 stale_cookie = (struct sctp_error_stale_cookie *)cause;
1167                                 /* stable_time is in usec, convert to msec. */
1168                                 asoc->cookie_preserve_req = ntohl(stale_cookie->stale_time) / 1000;
1169                                 /* Double it to be more robust on RTX. */
1170                                 asoc->cookie_preserve_req *= 2;
1171                                 asoc->stale_cookie_count++;
1172                                 if (asoc->stale_cookie_count >
1173                                     asoc->max_init_times) {
1174                                         sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED);
1175                                         /* now free the asoc */
1176                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1177                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1178                                         return (-1);
1179                                 }
1180                                 /* blast back to INIT state */
1181                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
1182                                 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
1183                                 sctp_stop_all_cookie_timers(stcb);
1184                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1185                         }
1186                         break;
1187                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1188                         /*
1189                          * Nothing we can do here, we don't do hostname
1190                          * addresses so if the peer does not like my IPv6
1191                          * (or IPv4 for that matter) it does not matter. If
1192                          * they don't support that type of address, they can
1193                          * NOT possibly get that packet type... i.e. with no
1194                          * IPv6 you can't receive a IPv6 packet. so we can
1195                          * safely ignore this one. If we ever added support
1196                          * for HOSTNAME Addresses, then we would need to do
1197                          * something here.
1198                          */
1199                         break;
1200                 case SCTP_CAUSE_UNRECOG_CHUNK:
1201                         if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) {
1202                                 struct sctp_error_unrecognized_chunk *unrec_chunk;
1203
1204                                 unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause;
1205                                 sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type);
1206                         }
1207                         break;
1208                 case SCTP_CAUSE_UNRECOG_PARAM:
1209                         /* XXX: We only consider the first parameter */
1210                         if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) {
1211                                 struct sctp_paramhdr *unrec_parameter;
1212
1213                                 unrec_parameter = (struct sctp_paramhdr *)(cause + 1);
1214                                 sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type));
1215                         }
1216                         break;
1217                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1218                         /*
1219                          * We ignore this since the timer will drive out a
1220                          * new cookie anyway and there timer will drive us
1221                          * to send a SHUTDOWN_COMPLETE. We can't send one
1222                          * here since we don't have their tag.
1223                          */
1224                         break;
1225                 case SCTP_CAUSE_DELETING_LAST_ADDR:
1226                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1227                 case SCTP_CAUSE_DELETING_SRC_ADDR:
1228                         /*
1229                          * We should NOT get these here, but in a
1230                          * ASCONF-ACK.
1231                          */
1232                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n",
1233                             cause_code);
1234                         break;
1235                 case SCTP_CAUSE_OUT_OF_RESC:
1236                         /*
1237                          * And what, pray tell do we do with the fact that
1238                          * the peer is out of resources? Not really sure we
1239                          * could do anything but abort. I suspect this
1240                          * should have came WITH an abort instead of in a
1241                          * OP-ERROR.
1242                          */
1243                         break;
1244                 default:
1245                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n",
1246                             cause_code);
1247                         break;
1248                 }
1249                 adjust = SCTP_SIZE32(cause_length);
1250                 if (remaining_length >= adjust) {
1251                         remaining_length -= adjust;
1252                 } else {
1253                         remaining_length = 0;
1254                 }
1255                 cause = (struct sctp_error_cause *)((caddr_t)cause + adjust);
1256         }
1257         sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED);
1258         return (0);
1259 }
1260
1261 static int
1262 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1263     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
1264     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1265     struct sctp_nets *net, int *abort_no_unlock,
1266     uint8_t mflowtype, uint32_t mflowid,
1267     uint32_t vrf_id)
1268 {
1269         struct sctp_init_ack *init_ack;
1270         struct mbuf *op_err;
1271
1272         SCTPDBG(SCTP_DEBUG_INPUT2,
1273             "sctp_handle_init_ack: handling INIT-ACK\n");
1274
1275         if (stcb == NULL) {
1276                 SCTPDBG(SCTP_DEBUG_INPUT2,
1277                     "sctp_handle_init_ack: TCB is null\n");
1278                 return (-1);
1279         }
1280         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1281                 /* Invalid length */
1282                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1283                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1284                     src, dst, sh, op_err,
1285                     mflowtype, mflowid,
1286                     vrf_id, net->port);
1287                 *abort_no_unlock = 1;
1288                 return (-1);
1289         }
1290         init_ack = &cp->init;
1291         /* validate parameters */
1292         if (init_ack->initiate_tag == 0) {
1293                 /* protocol error... send an abort */
1294                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1295                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1296                     src, dst, sh, op_err,
1297                     mflowtype, mflowid,
1298                     vrf_id, net->port);
1299                 *abort_no_unlock = 1;
1300                 return (-1);
1301         }
1302         if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1303                 /* protocol error... send an abort */
1304                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1305                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1306                     src, dst, sh, op_err,
1307                     mflowtype, mflowid,
1308                     vrf_id, net->port);
1309                 *abort_no_unlock = 1;
1310                 return (-1);
1311         }
1312         if (init_ack->num_inbound_streams == 0) {
1313                 /* protocol error... send an abort */
1314                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1315                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1316                     src, dst, sh, op_err,
1317                     mflowtype, mflowid,
1318                     vrf_id, net->port);
1319                 *abort_no_unlock = 1;
1320                 return (-1);
1321         }
1322         if (init_ack->num_outbound_streams == 0) {
1323                 /* protocol error... send an abort */
1324                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1325                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1326                     src, dst, sh, op_err,
1327                     mflowtype, mflowid,
1328                     vrf_id, net->port);
1329                 *abort_no_unlock = 1;
1330                 return (-1);
1331         }
1332         /* process according to association state... */
1333         switch (SCTP_GET_STATE(stcb)) {
1334         case SCTP_STATE_COOKIE_WAIT:
1335                 /* this is the expected state for this chunk */
1336                 /* process the INIT-ACK parameters */
1337                 if (stcb->asoc.primary_destination->dest_state &
1338                     SCTP_ADDR_UNCONFIRMED) {
1339                         /*
1340                          * The primary is where we sent the INIT, we can
1341                          * always consider it confirmed when the INIT-ACK is
1342                          * returned. Do this before we load addresses
1343                          * though.
1344                          */
1345                         stcb->asoc.primary_destination->dest_state &=
1346                             ~SCTP_ADDR_UNCONFIRMED;
1347                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1348                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1349                 }
1350                 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
1351                     net, abort_no_unlock,
1352                     mflowtype, mflowid,
1353                     vrf_id) < 0) {
1354                         /* error in parsing parameters */
1355                         return (-1);
1356                 }
1357                 /* update our state */
1358                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1359                 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_ECHOED);
1360
1361                 /* reset the RTO calc */
1362                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1363                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1364                             stcb->asoc.overall_error_count,
1365                             0,
1366                             SCTP_FROM_SCTP_INPUT,
1367                             __LINE__);
1368                 }
1369                 stcb->asoc.overall_error_count = 0;
1370                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1371                 /*
1372                  * collapse the init timer back in case of a exponential
1373                  * backoff
1374                  */
1375                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1376                     stcb, net);
1377                 /*
1378                  * the send at the end of the inbound data processing will
1379                  * cause the cookie to be sent
1380                  */
1381                 break;
1382         case SCTP_STATE_SHUTDOWN_SENT:
1383                 /* incorrect state... discard */
1384                 break;
1385         case SCTP_STATE_COOKIE_ECHOED:
1386                 /* incorrect state... discard */
1387                 break;
1388         case SCTP_STATE_OPEN:
1389                 /* incorrect state... discard */
1390                 break;
1391         case SCTP_STATE_EMPTY:
1392         case SCTP_STATE_INUSE:
1393         default:
1394                 /* incorrect state... discard */
1395                 return (-1);
1396                 break;
1397         }
1398         SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1399         return (0);
1400 }
1401
1402 static struct sctp_tcb *
1403 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1404     struct sockaddr *src, struct sockaddr *dst,
1405     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1406     struct sctp_inpcb *inp, struct sctp_nets **netp,
1407     struct sockaddr *init_src, int *notification,
1408     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1409     uint8_t mflowtype, uint32_t mflowid,
1410     uint32_t vrf_id, uint16_t port);
1411
1412 /*
1413  * handle a state cookie for an existing association m: input packet mbuf
1414  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1415  * "split" mbuf and the cookie signature does not exist offset: offset into
1416  * mbuf to the cookie-echo chunk
1417  */
1418 static struct sctp_tcb *
1419 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1420     struct sockaddr *src, struct sockaddr *dst,
1421     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1422     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1423     struct sockaddr *init_src, int *notification,
1424     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1425     uint8_t mflowtype, uint32_t mflowid,
1426     uint32_t vrf_id, uint16_t port)
1427 {
1428         struct sctp_association *asoc;
1429         struct sctp_init_chunk *init_cp, init_buf;
1430         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1431         struct sctp_asconf_addr *aparam, *naparam;
1432         struct sctp_asconf_ack *aack, *naack;
1433         struct sctp_tmit_chunk *chk, *nchk;
1434         struct sctp_stream_reset_list *strrst, *nstrrst;
1435         struct sctp_queued_to_read *sq, *nsq;
1436         struct sctp_nets *net;
1437         struct mbuf *op_err;
1438         struct timeval old;
1439         int init_offset, initack_offset, i;
1440         int retval;
1441         int spec_flag = 0;
1442         uint32_t how_indx;
1443 #if defined(SCTP_DETAILED_STR_STATS)
1444         int j;
1445 #endif
1446
1447         net = *netp;
1448         /* I know that the TCB is non-NULL from the caller */
1449         asoc = &stcb->asoc;
1450         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1451                 if (asoc->cookie_how[how_indx] == 0)
1452                         break;
1453         }
1454         if (how_indx < sizeof(asoc->cookie_how)) {
1455                 asoc->cookie_how[how_indx] = 1;
1456         }
1457         if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1458                 /* SHUTDOWN came in after sending INIT-ACK */
1459                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1460                 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, "");
1461                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
1462                     mflowtype, mflowid, inp->fibnum,
1463                     vrf_id, net->port);
1464                 if (how_indx < sizeof(asoc->cookie_how))
1465                         asoc->cookie_how[how_indx] = 2;
1466                 return (NULL);
1467         }
1468         /*
1469          * find and validate the INIT chunk in the cookie (peer's info) the
1470          * INIT should start after the cookie-echo header struct (chunk
1471          * header, state cookie header struct)
1472          */
1473         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1474
1475         init_cp = (struct sctp_init_chunk *)
1476             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1477             (uint8_t *)&init_buf);
1478         if (init_cp == NULL) {
1479                 /* could not pull a INIT chunk in cookie */
1480                 return (NULL);
1481         }
1482         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1483                 return (NULL);
1484         }
1485         /*
1486          * find and validate the INIT-ACK chunk in the cookie (my info) the
1487          * INIT-ACK follows the INIT chunk
1488          */
1489         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1490         initack_cp = (struct sctp_init_ack_chunk *)
1491             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1492             (uint8_t *)&initack_buf);
1493         if (initack_cp == NULL) {
1494                 /* could not pull INIT-ACK chunk in cookie */
1495                 return (NULL);
1496         }
1497         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1498                 return (NULL);
1499         }
1500         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1501             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1502                 /*
1503                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
1504                  * to get into the OPEN state
1505                  */
1506                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1507                         /*-
1508                          * Opps, this means that we somehow generated two vtag's
1509                          * the same. I.e. we did:
1510                          *  Us               Peer
1511                          *   <---INIT(tag=a)------
1512                          *   ----INIT-ACK(tag=t)-->
1513                          *   ----INIT(tag=t)------> *1
1514                          *   <---INIT-ACK(tag=a)---
1515                          *   <----CE(tag=t)------------- *2
1516                          *
1517                          * At point *1 we should be generating a different
1518                          * tag t'. Which means we would throw away the CE and send
1519                          * ours instead. Basically this is case C (throw away side).
1520                          */
1521                         if (how_indx < sizeof(asoc->cookie_how))
1522                                 asoc->cookie_how[how_indx] = 17;
1523                         return (NULL);
1524                 }
1525                 switch (SCTP_GET_STATE(stcb)) {
1526                 case SCTP_STATE_COOKIE_WAIT:
1527                 case SCTP_STATE_COOKIE_ECHOED:
1528                         /*
1529                          * INIT was sent but got a COOKIE_ECHO with the
1530                          * correct tags... just accept it...but we must
1531                          * process the init so that we can make sure we have
1532                          * the right seq no's.
1533                          */
1534                         /* First we must process the INIT !! */
1535                         retval = sctp_process_init(init_cp, stcb);
1536                         if (retval < 0) {
1537                                 if (how_indx < sizeof(asoc->cookie_how))
1538                                         asoc->cookie_how[how_indx] = 3;
1539                                 return (NULL);
1540                         }
1541                         /* we have already processed the INIT so no problem */
1542                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp,
1543                             stcb, net,
1544                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1545                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp,
1546                             stcb, net,
1547                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1548                         /* update current state */
1549                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)
1550                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1551                         else
1552                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1553
1554                         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1555                         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1556                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1557                                     stcb->sctp_ep, stcb, NULL);
1558                         }
1559                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1560                         sctp_stop_all_cookie_timers(stcb);
1561                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1562                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1563                             (!SCTP_IS_LISTENING(inp))) {
1564                                 /*
1565                                  * Here is where collision would go if we
1566                                  * did a connect() and instead got a
1567                                  * init/init-ack/cookie done before the
1568                                  * init-ack came back..
1569                                  */
1570                                 stcb->sctp_ep->sctp_flags |=
1571                                     SCTP_PCB_FLAGS_CONNECTED;
1572                                 soisconnected(stcb->sctp_socket);
1573                         }
1574                         /* notify upper layer */
1575                         *notification = SCTP_NOTIFY_ASSOC_UP;
1576                         /*
1577                          * since we did not send a HB make sure we don't
1578                          * double things
1579                          */
1580                         old.tv_sec = cookie->time_entered.tv_sec;
1581                         old.tv_usec = cookie->time_entered.tv_usec;
1582                         net->hb_responded = 1;
1583                         sctp_calculate_rto(stcb, asoc, net, &old,
1584                             SCTP_RTT_FROM_NON_DATA);
1585
1586                         if (stcb->asoc.sctp_autoclose_ticks &&
1587                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1588                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1589                                     inp, stcb, NULL);
1590                         }
1591                         break;
1592                 default:
1593                         /*
1594                          * we're in the OPEN state (or beyond), so peer must
1595                          * have simply lost the COOKIE-ACK
1596                          */
1597                         break;
1598                 }               /* end switch */
1599                 sctp_stop_all_cookie_timers(stcb);
1600                 /*
1601                  * We ignore the return code here.. not sure if we should
1602                  * somehow abort.. but we do have an existing asoc. This
1603                  * really should not fail.
1604                  */
1605                 if (sctp_load_addresses_from_init(stcb, m,
1606                     init_offset + sizeof(struct sctp_init_chunk),
1607                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
1608                         if (how_indx < sizeof(asoc->cookie_how))
1609                                 asoc->cookie_how[how_indx] = 4;
1610                         return (NULL);
1611                 }
1612                 /* respond with a COOKIE-ACK */
1613                 sctp_toss_old_cookies(stcb, asoc);
1614                 sctp_send_cookie_ack(stcb);
1615                 if (how_indx < sizeof(asoc->cookie_how))
1616                         asoc->cookie_how[how_indx] = 5;
1617                 return (stcb);
1618         }
1619
1620         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1621             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1622             cookie->tie_tag_my_vtag == 0 &&
1623             cookie->tie_tag_peer_vtag == 0) {
1624                 /*
1625                  * case C in Section 5.2.4 Table 2: XMOO silently discard
1626                  */
1627                 if (how_indx < sizeof(asoc->cookie_how))
1628                         asoc->cookie_how[how_indx] = 6;
1629                 return (NULL);
1630         }
1631         /*
1632          * If nat support, and the below and stcb is established, send back
1633          * a ABORT(colliding state) if we are established.
1634          */
1635         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) &&
1636             (asoc->peer_supports_nat) &&
1637             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1638             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1639             (asoc->peer_vtag == 0)))) {
1640                 /*
1641                  * Special case - Peer's support nat. We may have two init's
1642                  * that we gave out the same tag on since one was not
1643                  * established.. i.e. we get INIT from host-1 behind the nat
1644                  * and we respond tag-a, we get a INIT from host-2 behind
1645                  * the nat and we get tag-a again. Then we bring up host-1
1646                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1647                  * Now we have colliding state. We must send an abort here
1648                  * with colliding state indication.
1649                  */
1650                 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, "");
1651                 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
1652                     mflowtype, mflowid, inp->fibnum,
1653                     vrf_id, port);
1654                 return (NULL);
1655         }
1656         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1657             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1658             (asoc->peer_vtag == 0))) {
1659                 /*
1660                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1661                  * should be ok, re-accept peer info
1662                  */
1663                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1664                         /*
1665                          * Extension of case C. If we hit this, then the
1666                          * random number generator returned the same vtag
1667                          * when we first sent our INIT-ACK and when we later
1668                          * sent our INIT. The side with the seq numbers that
1669                          * are different will be the one that normnally
1670                          * would have hit case C. This in effect "extends"
1671                          * our vtags in this collision case to be 64 bits.
1672                          * The same collision could occur aka you get both
1673                          * vtag and seq number the same twice in a row.. but
1674                          * is much less likely. If it did happen then we
1675                          * would proceed through and bring up the assoc.. we
1676                          * may end up with the wrong stream setup however..
1677                          * which would be bad.. but there is no way to
1678                          * tell.. until we send on a stream that does not
1679                          * exist :-)
1680                          */
1681                         if (how_indx < sizeof(asoc->cookie_how))
1682                                 asoc->cookie_how[how_indx] = 7;
1683
1684                         return (NULL);
1685                 }
1686                 if (how_indx < sizeof(asoc->cookie_how))
1687                         asoc->cookie_how[how_indx] = 8;
1688                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1689                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1690                 sctp_stop_all_cookie_timers(stcb);
1691                 /*
1692                  * since we did not send a HB make sure we don't double
1693                  * things
1694                  */
1695                 net->hb_responded = 1;
1696                 if (stcb->asoc.sctp_autoclose_ticks &&
1697                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1698                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1699                             NULL);
1700                 }
1701                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1702                 if (asoc->pre_open_streams < asoc->streamoutcnt) {
1703                         asoc->pre_open_streams = asoc->streamoutcnt;
1704                 }
1705
1706                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1707                         /*
1708                          * Ok the peer probably discarded our data (if we
1709                          * echoed a cookie+data). So anything on the
1710                          * sent_queue should be marked for retransmit, we
1711                          * may not get something to kick us so it COULD
1712                          * still take a timeout to move these.. but it can't
1713                          * hurt to mark them.
1714                          */
1715
1716                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1717                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1718                                         chk->sent = SCTP_DATAGRAM_RESEND;
1719                                         sctp_flight_size_decrease(chk);
1720                                         sctp_total_flight_decrease(stcb, chk);
1721                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1722                                         spec_flag++;
1723                                 }
1724                         }
1725                 }
1726                 /* process the INIT info (peer's info) */
1727                 retval = sctp_process_init(init_cp, stcb);
1728                 if (retval < 0) {
1729                         if (how_indx < sizeof(asoc->cookie_how))
1730                                 asoc->cookie_how[how_indx] = 9;
1731                         return (NULL);
1732                 }
1733                 if (sctp_load_addresses_from_init(stcb, m,
1734                     init_offset + sizeof(struct sctp_init_chunk),
1735                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
1736                         if (how_indx < sizeof(asoc->cookie_how))
1737                                 asoc->cookie_how[how_indx] = 10;
1738                         return (NULL);
1739                 }
1740                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
1741                     (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
1742                         *notification = SCTP_NOTIFY_ASSOC_UP;
1743
1744                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1745                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1746                             (!SCTP_IS_LISTENING(inp))) {
1747                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
1748                                 soisconnected(stcb->sctp_socket);
1749                         }
1750                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)
1751                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1752                         else
1753                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1754                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1755                 } else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
1756                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1757                 } else {
1758                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1759                 }
1760                 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1761                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1762                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1763                             stcb->sctp_ep, stcb, NULL);
1764                 }
1765                 sctp_stop_all_cookie_timers(stcb);
1766                 sctp_toss_old_cookies(stcb, asoc);
1767                 sctp_send_cookie_ack(stcb);
1768                 if (spec_flag) {
1769                         /*
1770                          * only if we have retrans set do we do this. What
1771                          * this call does is get only the COOKIE-ACK out and
1772                          * then when we return the normal call to
1773                          * sctp_chunk_output will get the retrans out behind
1774                          * this.
1775                          */
1776                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1777                 }
1778                 if (how_indx < sizeof(asoc->cookie_how))
1779                         asoc->cookie_how[how_indx] = 11;
1780
1781                 return (stcb);
1782         }
1783         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1784             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1785             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1786             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1787             cookie->tie_tag_peer_vtag != 0) {
1788                 struct sctpasochead *head;
1789
1790                 if (asoc->peer_supports_nat) {
1791                         /*
1792                          * This is a gross gross hack. Just call the
1793                          * cookie_new code since we are allowing a duplicate
1794                          * association. I hope this works...
1795                          */
1796                         return (sctp_process_cookie_new(m, iphlen, offset, src, dst,
1797                             sh, cookie, cookie_len,
1798                             inp, netp, init_src, notification,
1799                             auth_skipped, auth_offset, auth_len,
1800                             mflowtype, mflowid,
1801                             vrf_id, port));
1802                 }
1803                 /*
1804                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1805                  */
1806                 /* temp code */
1807                 if (how_indx < sizeof(asoc->cookie_how))
1808                         asoc->cookie_how[how_indx] = 12;
1809                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net,
1810                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1811                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1812                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
1813
1814                 /* notify upper layer */
1815                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1816                 atomic_add_int(&stcb->asoc.refcnt, 1);
1817                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) &&
1818                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1819                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) {
1820                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1821                 }
1822                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
1823                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1824                 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
1825                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1826                 }
1827                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1828                         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1829                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1830                             stcb->sctp_ep, stcb, NULL);
1831
1832                 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
1833                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1834                         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1835                 }
1836                 if (asoc->pre_open_streams < asoc->streamoutcnt) {
1837                         asoc->pre_open_streams = asoc->streamoutcnt;
1838                 }
1839                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1840                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1841                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1842                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1843                 asoc->str_reset_seq_in = asoc->init_seq_number;
1844                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1845                 asoc->send_sack = 1;
1846                 if (asoc->mapping_array) {
1847                         memset(asoc->mapping_array, 0,
1848                             asoc->mapping_array_size);
1849                 }
1850                 if (asoc->nr_mapping_array) {
1851                         memset(asoc->nr_mapping_array, 0,
1852                             asoc->mapping_array_size);
1853                 }
1854                 SCTP_TCB_UNLOCK(stcb);
1855                 SCTP_INP_INFO_WLOCK();
1856                 SCTP_INP_WLOCK(stcb->sctp_ep);
1857                 SCTP_TCB_LOCK(stcb);
1858                 atomic_add_int(&stcb->asoc.refcnt, -1);
1859                 /* send up all the data */
1860                 SCTP_TCB_SEND_LOCK(stcb);
1861
1862                 sctp_report_all_outbound(stcb, 0, SCTP_SO_LOCKED);
1863                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1864                         stcb->asoc.strmout[i].chunks_on_queues = 0;
1865 #if defined(SCTP_DETAILED_STR_STATS)
1866                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
1867                                 asoc->strmout[i].abandoned_sent[j] = 0;
1868                                 asoc->strmout[i].abandoned_unsent[j] = 0;
1869                         }
1870 #else
1871                         asoc->strmout[i].abandoned_sent[0] = 0;
1872                         asoc->strmout[i].abandoned_unsent[0] = 0;
1873 #endif
1874                         stcb->asoc.strmout[i].sid = i;
1875                         stcb->asoc.strmout[i].next_mid_ordered = 0;
1876                         stcb->asoc.strmout[i].next_mid_unordered = 0;
1877                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
1878                 }
1879                 TAILQ_FOREACH_SAFE(strrst, &asoc->resetHead, next_resp, nstrrst) {
1880                         TAILQ_REMOVE(&asoc->resetHead, strrst, next_resp);
1881                         SCTP_FREE(strrst, SCTP_M_STRESET);
1882                 }
1883                 TAILQ_FOREACH_SAFE(sq, &asoc->pending_reply_queue, next, nsq) {
1884                         TAILQ_REMOVE(&asoc->pending_reply_queue, sq, next);
1885                         if (sq->data) {
1886                                 sctp_m_freem(sq->data);
1887                                 sq->data = NULL;
1888                         }
1889                         sctp_free_remote_addr(sq->whoFrom);
1890                         sq->whoFrom = NULL;
1891                         sq->stcb = NULL;
1892                         sctp_free_a_readq(stcb, sq);
1893                 }
1894                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
1895                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
1896                         if (chk->data) {
1897                                 sctp_m_freem(chk->data);
1898                                 chk->data = NULL;
1899                         }
1900                         if (chk->holds_key_ref)
1901                                 sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED);
1902                         sctp_free_remote_addr(chk->whoTo);
1903                         SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk);
1904                         SCTP_DECR_CHK_COUNT();
1905                 }
1906                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
1907                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
1908                         if (chk->data) {
1909                                 sctp_m_freem(chk->data);
1910                                 chk->data = NULL;
1911                         }
1912                         if (chk->holds_key_ref)
1913                                 sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED);
1914                         sctp_free_remote_addr(chk->whoTo);
1915                         SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk);
1916                         SCTP_DECR_CHK_COUNT();
1917                 }
1918                 TAILQ_FOREACH_SAFE(aparam, &asoc->asconf_queue, next, naparam) {
1919                         TAILQ_REMOVE(&asoc->asconf_queue, aparam, next);
1920                         SCTP_FREE(aparam, SCTP_M_ASC_ADDR);
1921                 }
1922                 TAILQ_FOREACH_SAFE(aack, &asoc->asconf_ack_sent, next, naack) {
1923                         TAILQ_REMOVE(&asoc->asconf_ack_sent, aack, next);
1924                         if (aack->data != NULL) {
1925                                 sctp_m_freem(aack->data);
1926                         }
1927                         SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_asconf_ack), aack);
1928                 }
1929
1930                 /* process the INIT-ACK info (my info) */
1931                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1932                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1933
1934                 /* pull from vtag hash */
1935                 LIST_REMOVE(stcb, sctp_asocs);
1936                 /* re-insert to new vtag position */
1937                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1938                     SCTP_BASE_INFO(hashasocmark))];
1939                 /*
1940                  * put it in the bucket in the vtag hash of assoc's for the
1941                  * system
1942                  */
1943                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
1944
1945                 SCTP_TCB_SEND_UNLOCK(stcb);
1946                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
1947                 SCTP_INP_INFO_WUNLOCK();
1948                 asoc->total_flight = 0;
1949                 asoc->total_flight_count = 0;
1950                 /* process the INIT info (peer's info) */
1951                 retval = sctp_process_init(init_cp, stcb);
1952                 if (retval < 0) {
1953                         if (how_indx < sizeof(asoc->cookie_how))
1954                                 asoc->cookie_how[how_indx] = 13;
1955
1956                         return (NULL);
1957                 }
1958                 /*
1959                  * since we did not send a HB make sure we don't double
1960                  * things
1961                  */
1962                 net->hb_responded = 1;
1963
1964                 if (sctp_load_addresses_from_init(stcb, m,
1965                     init_offset + sizeof(struct sctp_init_chunk),
1966                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
1967                         if (how_indx < sizeof(asoc->cookie_how))
1968                                 asoc->cookie_how[how_indx] = 14;
1969
1970                         return (NULL);
1971                 }
1972                 /* respond with a COOKIE-ACK */
1973                 sctp_stop_all_cookie_timers(stcb);
1974                 sctp_toss_old_cookies(stcb, asoc);
1975                 sctp_send_cookie_ack(stcb);
1976                 if (how_indx < sizeof(asoc->cookie_how))
1977                         asoc->cookie_how[how_indx] = 15;
1978
1979                 return (stcb);
1980         }
1981         if (how_indx < sizeof(asoc->cookie_how))
1982                 asoc->cookie_how[how_indx] = 16;
1983         /* all other cases... */
1984         return (NULL);
1985 }
1986
1987 /*
1988  * handle a state cookie for a new association m: input packet mbuf chain--
1989  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
1990  * and the cookie signature does not exist offset: offset into mbuf to the
1991  * cookie-echo chunk length: length of the cookie chunk to: where the init
1992  * was from returns a new TCB
1993  */
1994 static struct sctp_tcb *
1995 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1996     struct sockaddr *src, struct sockaddr *dst,
1997     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1998     struct sctp_inpcb *inp, struct sctp_nets **netp,
1999     struct sockaddr *init_src, int *notification,
2000     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2001     uint8_t mflowtype, uint32_t mflowid,
2002     uint32_t vrf_id, uint16_t port)
2003 {
2004         struct sctp_tcb *stcb;
2005         struct sctp_init_chunk *init_cp, init_buf;
2006         struct sctp_init_ack_chunk *initack_cp, initack_buf;
2007         union sctp_sockstore store;
2008         struct sctp_association *asoc;
2009         int init_offset, initack_offset, initack_limit;
2010         int retval;
2011         int error = 0;
2012         uint8_t auth_chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
2013
2014         /*
2015          * find and validate the INIT chunk in the cookie (peer's info) the
2016          * INIT should start after the cookie-echo header struct (chunk
2017          * header, state cookie header struct)
2018          */
2019         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
2020         init_cp = (struct sctp_init_chunk *)
2021             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
2022             (uint8_t *)&init_buf);
2023         if (init_cp == NULL) {
2024                 /* could not pull a INIT chunk in cookie */
2025                 SCTPDBG(SCTP_DEBUG_INPUT1,
2026                     "process_cookie_new: could not pull INIT chunk hdr\n");
2027                 return (NULL);
2028         }
2029         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
2030                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
2031                 return (NULL);
2032         }
2033         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
2034         /*
2035          * find and validate the INIT-ACK chunk in the cookie (my info) the
2036          * INIT-ACK follows the INIT chunk
2037          */
2038         initack_cp = (struct sctp_init_ack_chunk *)
2039             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
2040             (uint8_t *)&initack_buf);
2041         if (initack_cp == NULL) {
2042                 /* could not pull INIT-ACK chunk in cookie */
2043                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2044                 return (NULL);
2045         }
2046         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2047                 return (NULL);
2048         }
2049         /*
2050          * NOTE: We can't use the INIT_ACK's chk_length to determine the
2051          * "initack_limit" value.  This is because the chk_length field
2052          * includes the length of the cookie, but the cookie is omitted when
2053          * the INIT and INIT_ACK are tacked onto the cookie...
2054          */
2055         initack_limit = offset + cookie_len;
2056
2057         /*
2058          * now that we know the INIT/INIT-ACK are in place, create a new TCB
2059          * and popluate
2060          */
2061
2062         /*
2063          * Here we do a trick, we set in NULL for the proc/thread argument.
2064          * We do this since in effect we only use the p argument when the
2065          * socket is unbound and we must do an implicit bind. Since we are
2066          * getting a cookie, we cannot be unbound.
2067          */
2068         stcb = sctp_aloc_assoc(inp, init_src, &error,
2069             ntohl(initack_cp->init.initiate_tag), vrf_id,
2070             ntohs(initack_cp->init.num_outbound_streams),
2071             port,
2072             (struct thread *)NULL,
2073             SCTP_DONT_INITIALIZE_AUTH_PARAMS);
2074         if (stcb == NULL) {
2075                 struct mbuf *op_err;
2076
2077                 /* memory problem? */
2078                 SCTPDBG(SCTP_DEBUG_INPUT1,
2079                     "process_cookie_new: no room for another TCB!\n");
2080                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2081                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2082                     src, dst, sh, op_err,
2083                     mflowtype, mflowid,
2084                     vrf_id, port);
2085                 return (NULL);
2086         }
2087         asoc = &stcb->asoc;
2088         /* get scope variables out of cookie */
2089         asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
2090         asoc->scope.site_scope = cookie->site_scope;
2091         asoc->scope.local_scope = cookie->local_scope;
2092         asoc->scope.loopback_scope = cookie->loopback_scope;
2093
2094         if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2095             (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2096                 struct mbuf *op_err;
2097
2098                 /*
2099                  * Houston we have a problem. The EP changed while the
2100                  * cookie was in flight. Only recourse is to abort the
2101                  * association.
2102                  */
2103                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2104                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2105                     src, dst, sh, op_err,
2106                     mflowtype, mflowid,
2107                     vrf_id, port);
2108                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2109                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2110                 return (NULL);
2111         }
2112         /* process the INIT-ACK info (my info) */
2113         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2114         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2115         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2116         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2117         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2118         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2119         asoc->str_reset_seq_in = asoc->init_seq_number;
2120
2121         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2122
2123         /* process the INIT info (peer's info) */
2124         retval = sctp_process_init(init_cp, stcb);
2125         if (retval < 0) {
2126                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2127                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2128                 return (NULL);
2129         }
2130         /* load all addresses */
2131         if (sctp_load_addresses_from_init(stcb, m,
2132             init_offset + sizeof(struct sctp_init_chunk), initack_offset,
2133             src, dst, init_src, port)) {
2134                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2135                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2136                 return (NULL);
2137         }
2138         /*
2139          * verify any preceding AUTH chunk that was skipped
2140          */
2141         /* pull the local authentication parameters from the cookie/init-ack */
2142         sctp_auth_get_cookie_params(stcb, m,
2143             initack_offset + sizeof(struct sctp_init_ack_chunk),
2144             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2145         if (auth_skipped) {
2146                 struct sctp_auth_chunk *auth;
2147
2148                 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) {
2149                         auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2150                 } else {
2151                         auth = NULL;
2152                 }
2153                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2154                         /* auth HMAC failed, dump the assoc and packet */
2155                         SCTPDBG(SCTP_DEBUG_AUTH1,
2156                             "COOKIE-ECHO: AUTH failed\n");
2157                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2158                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_21);
2159                         return (NULL);
2160                 } else {
2161                         /* remaining chunks checked... good to go */
2162                         stcb->asoc.authenticated = 1;
2163                 }
2164         }
2165
2166         /*
2167          * if we're doing ASCONFs, check to see if we have any new local
2168          * addresses that need to get added to the peer (eg. addresses
2169          * changed while cookie echo in flight).  This needs to be done
2170          * after we go to the OPEN state to do the correct asconf
2171          * processing. else, make sure we have the correct addresses in our
2172          * lists
2173          */
2174
2175         /* warning, we re-use sin, sin6, sa_store here! */
2176         /* pull in local_address (our "from" address) */
2177         switch (cookie->laddr_type) {
2178 #ifdef INET
2179         case SCTP_IPV4_ADDRESS:
2180                 /* source addr is IPv4 */
2181                 memset(&store.sin, 0, sizeof(struct sockaddr_in));
2182                 store.sin.sin_family = AF_INET;
2183                 store.sin.sin_len = sizeof(struct sockaddr_in);
2184                 store.sin.sin_addr.s_addr = cookie->laddress[0];
2185                 break;
2186 #endif
2187 #ifdef INET6
2188         case SCTP_IPV6_ADDRESS:
2189                 /* source addr is IPv6 */
2190                 memset(&store.sin6, 0, sizeof(struct sockaddr_in6));
2191                 store.sin6.sin6_family = AF_INET6;
2192                 store.sin6.sin6_len = sizeof(struct sockaddr_in6);
2193                 store.sin6.sin6_scope_id = cookie->scope_id;
2194                 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr));
2195                 break;
2196 #endif
2197         default:
2198                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2199                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
2200                 return (NULL);
2201         }
2202
2203         /* update current state */
2204         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2205         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
2206         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2207                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2208                     stcb->sctp_ep, stcb, NULL);
2209         }
2210         sctp_stop_all_cookie_timers(stcb);
2211         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2212         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2213
2214         /* set up to notify upper layer */
2215         *notification = SCTP_NOTIFY_ASSOC_UP;
2216         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2217             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2218             (!SCTP_IS_LISTENING(inp))) {
2219                 /*
2220                  * This is an endpoint that called connect() how it got a
2221                  * cookie that is NEW is a bit of a mystery. It must be that
2222                  * the INIT was sent, but before it got there.. a complete
2223                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2224                  * should have went to the other code.. not here.. oh well..
2225                  * a bit of protection is worth having..
2226                  */
2227                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2228                 soisconnected(stcb->sctp_socket);
2229         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2230             (SCTP_IS_LISTENING(inp))) {
2231                 /*
2232                  * We don't want to do anything with this one. Since it is
2233                  * the listening guy. The timer will get started for
2234                  * accepted connections in the caller.
2235                  */
2236                 ;
2237         }
2238         if (stcb->asoc.sctp_autoclose_ticks &&
2239             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2240                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2241         }
2242         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2243         *netp = sctp_findnet(stcb, init_src);
2244         if (*netp != NULL) {
2245                 struct timeval old;
2246
2247                 /*
2248                  * Since we did not send a HB, make sure we don't double
2249                  * things.
2250                  */
2251                 (*netp)->hb_responded = 1;
2252                 /* Calculate the RTT. */
2253                 old.tv_sec = cookie->time_entered.tv_sec;
2254                 old.tv_usec = cookie->time_entered.tv_usec;
2255                 sctp_calculate_rto(stcb, asoc, *netp, &old, SCTP_RTT_FROM_NON_DATA);
2256         }
2257         /* respond with a COOKIE-ACK */
2258         sctp_send_cookie_ack(stcb);
2259
2260         /*
2261          * check the address lists for any ASCONFs that need to be sent
2262          * AFTER the cookie-ack is sent
2263          */
2264         sctp_check_address_list(stcb, m,
2265             initack_offset + sizeof(struct sctp_init_ack_chunk),
2266             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2267             &store.sa, cookie->local_scope, cookie->site_scope,
2268             cookie->ipv4_scope, cookie->loopback_scope);
2269
2270         return (stcb);
2271 }
2272
2273 /*
2274  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2275  * we NEED to make sure we are not already using the vtag. If so we
2276  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2277         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2278                                                             SCTP_BASE_INFO(hashasocmark))];
2279         LIST_FOREACH(stcb, head, sctp_asocs) {
2280                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2281                        -- SEND ABORT - TRY AGAIN --
2282                 }
2283         }
2284 */
2285
2286 /*
2287  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2288  * existing (non-NULL) TCB
2289  */
2290 static struct mbuf *
2291 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2292     struct sockaddr *src, struct sockaddr *dst,
2293     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2294     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2295     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2296     struct sctp_tcb **locked_tcb,
2297     uint8_t mflowtype, uint32_t mflowid,
2298     uint32_t vrf_id, uint16_t port)
2299 {
2300         struct sctp_state_cookie *cookie;
2301         struct sctp_tcb *l_stcb = *stcb;
2302         struct sctp_inpcb *l_inp;
2303         struct sockaddr *to;
2304         struct sctp_pcb *ep;
2305         struct mbuf *m_sig;
2306         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2307         uint8_t *sig;
2308         uint8_t cookie_ok = 0;
2309         unsigned int sig_offset, cookie_offset;
2310         unsigned int cookie_len;
2311         struct timeval now;
2312         struct timeval time_entered, time_expires;
2313         int notification = 0;
2314         struct sctp_nets *netl;
2315         int had_a_existing_tcb = 0;
2316         int send_int_conf = 0;
2317 #ifdef INET
2318         struct sockaddr_in sin;
2319 #endif
2320 #ifdef INET6
2321         struct sockaddr_in6 sin6;
2322 #endif
2323
2324         SCTPDBG(SCTP_DEBUG_INPUT2,
2325             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2326
2327         if (inp_p == NULL) {
2328                 return (NULL);
2329         }
2330         cookie = &cp->cookie;
2331         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2332         cookie_len = ntohs(cp->ch.chunk_length);
2333
2334         if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2335             sizeof(struct sctp_init_chunk) +
2336             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2337                 /* cookie too small */
2338                 return (NULL);
2339         }
2340         if ((cookie->peerport != sh->src_port) ||
2341             (cookie->myport != sh->dest_port) ||
2342             (cookie->my_vtag != sh->v_tag)) {
2343                 /*
2344                  * invalid ports or bad tag.  Note that we always leave the
2345                  * v_tag in the header in network order and when we stored
2346                  * it in the my_vtag slot we also left it in network order.
2347                  * This maintains the match even though it may be in the
2348                  * opposite byte order of the machine :->
2349                  */
2350                 return (NULL);
2351         }
2352         /*
2353          * split off the signature into its own mbuf (since it should not be
2354          * calculated in the sctp_hmac_m() call).
2355          */
2356         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2357         m_sig = m_split(m, sig_offset, M_NOWAIT);
2358         if (m_sig == NULL) {
2359                 /* out of memory or ?? */
2360                 return (NULL);
2361         }
2362 #ifdef SCTP_MBUF_LOGGING
2363         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2364                 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT);
2365         }
2366 #endif
2367
2368         /*
2369          * compute the signature/digest for the cookie
2370          */
2371         ep = &(*inp_p)->sctp_ep;
2372         l_inp = *inp_p;
2373         if (l_stcb) {
2374                 SCTP_TCB_UNLOCK(l_stcb);
2375         }
2376         SCTP_INP_RLOCK(l_inp);
2377         if (l_stcb) {
2378                 SCTP_TCB_LOCK(l_stcb);
2379         }
2380         /* which cookie is it? */
2381         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2382             (ep->current_secret_number != ep->last_secret_number)) {
2383                 /* it's the old cookie */
2384                 (void)sctp_hmac_m(SCTP_HMAC,
2385                     (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2386                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2387         } else {
2388                 /* it's the current cookie */
2389                 (void)sctp_hmac_m(SCTP_HMAC,
2390                     (uint8_t *)ep->secret_key[(int)ep->current_secret_number],
2391                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2392         }
2393         /* get the signature */
2394         SCTP_INP_RUNLOCK(l_inp);
2395         sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig);
2396         if (sig == NULL) {
2397                 /* couldn't find signature */
2398                 sctp_m_freem(m_sig);
2399                 return (NULL);
2400         }
2401         /* compare the received digest with the computed digest */
2402         if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2403                 /* try the old cookie? */
2404                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2405                     (ep->current_secret_number != ep->last_secret_number)) {
2406                         /* compute digest with old */
2407                         (void)sctp_hmac_m(SCTP_HMAC,
2408                             (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2409                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2410                         /* compare */
2411                         if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2412                                 cookie_ok = 1;
2413                 }
2414         } else {
2415                 cookie_ok = 1;
2416         }
2417
2418         /*
2419          * Now before we continue we must reconstruct our mbuf so that
2420          * normal processing of any other chunks will work.
2421          */
2422         {
2423                 struct mbuf *m_at;
2424
2425                 m_at = m;
2426                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2427                         m_at = SCTP_BUF_NEXT(m_at);
2428                 }
2429                 SCTP_BUF_NEXT(m_at) = m_sig;
2430         }
2431
2432         if (cookie_ok == 0) {
2433                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2434                 SCTPDBG(SCTP_DEBUG_INPUT2,
2435                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2436                     (uint32_t)offset, cookie_offset, sig_offset);
2437                 return (NULL);
2438         }
2439
2440         if (sctp_ticks_to_msecs(cookie->cookie_life) > SCTP_MAX_COOKIE_LIFE) {
2441                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: Invalid cookie lifetime\n");
2442                 return (NULL);
2443         }
2444         time_entered.tv_sec = cookie->time_entered.tv_sec;
2445         time_entered.tv_usec = cookie->time_entered.tv_usec;
2446         if ((time_entered.tv_sec < 0) ||
2447             (time_entered.tv_usec < 0) ||
2448             (time_entered.tv_usec >= 1000000)) {
2449                 /* Invalid time stamp. Cookie must have been modified. */
2450                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: Invalid time stamp\n");
2451                 return (NULL);
2452         }
2453         (void)SCTP_GETTIME_TIMEVAL(&now);
2454         if (timevalcmp(&now, &time_entered, <)) {
2455                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie generated in the future!\n");
2456                 return (NULL);
2457         }
2458         /*
2459          * Check the cookie timestamps to be sure it's not stale.
2460          * cookie_life is in ticks, so we convert to seconds.
2461          */
2462         time_expires.tv_sec = time_entered.tv_sec + sctp_ticks_to_secs(cookie->cookie_life);
2463         time_expires.tv_usec = time_entered.tv_usec;
2464         if (timevalcmp(&now, &time_expires, >)) {
2465                 /* cookie is stale! */
2466                 struct mbuf *op_err;
2467                 struct sctp_error_stale_cookie *cause;
2468                 struct timeval diff;
2469                 uint32_t staleness;
2470
2471                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie),
2472                     0, M_NOWAIT, 1, MT_DATA);
2473                 if (op_err == NULL) {
2474                         /* FOOBAR */
2475                         return (NULL);
2476                 }
2477                 /* Set the len */
2478                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie);
2479                 cause = mtod(op_err, struct sctp_error_stale_cookie *);
2480                 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE);
2481                 cause->cause.length = htons(sizeof(struct sctp_error_stale_cookie));
2482                 diff = now;
2483                 timevalsub(&diff, &time_expires);
2484                 if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) {
2485                         staleness = UINT32_MAX;
2486                 } else {
2487                         staleness = diff.tv_sec * 1000000;
2488                 }
2489                 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) {
2490                         staleness += diff.tv_usec;
2491                 } else {
2492                         staleness = UINT32_MAX;
2493                 }
2494                 cause->stale_time = htonl(staleness);
2495                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
2496                     mflowtype, mflowid, l_inp->fibnum,
2497                     vrf_id, port);
2498                 return (NULL);
2499         }
2500         /*
2501          * Now we must see with the lookup address if we have an existing
2502          * asoc. This will only happen if we were in the COOKIE-WAIT state
2503          * and a INIT collided with us and somewhere the peer sent the
2504          * cookie on another address besides the single address our assoc
2505          * had for him. In this case we will have one of the tie-tags set at
2506          * least AND the address field in the cookie can be used to look it
2507          * up.
2508          */
2509         to = NULL;
2510         switch (cookie->addr_type) {
2511 #ifdef INET6
2512         case SCTP_IPV6_ADDRESS:
2513                 memset(&sin6, 0, sizeof(sin6));
2514                 sin6.sin6_family = AF_INET6;
2515                 sin6.sin6_len = sizeof(sin6);
2516                 sin6.sin6_port = sh->src_port;
2517                 sin6.sin6_scope_id = cookie->scope_id;
2518                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2519                     sizeof(sin6.sin6_addr.s6_addr));
2520                 to = (struct sockaddr *)&sin6;
2521                 break;
2522 #endif
2523 #ifdef INET
2524         case SCTP_IPV4_ADDRESS:
2525                 memset(&sin, 0, sizeof(sin));
2526                 sin.sin_family = AF_INET;
2527                 sin.sin_len = sizeof(sin);
2528                 sin.sin_port = sh->src_port;
2529                 sin.sin_addr.s_addr = cookie->address[0];
2530                 to = (struct sockaddr *)&sin;
2531                 break;
2532 #endif
2533         default:
2534                 /* This should not happen */
2535                 return (NULL);
2536         }
2537         if (*stcb == NULL) {
2538                 /* Yep, lets check */
2539                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
2540                 if (*stcb == NULL) {
2541                         /*
2542                          * We should have only got back the same inp. If we
2543                          * got back a different ep we have a problem. The
2544                          * original findep got back l_inp and now
2545                          */
2546                         if (l_inp != *inp_p) {
2547                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2548                         }
2549                 } else {
2550                         if (*locked_tcb == NULL) {
2551                                 /*
2552                                  * In this case we found the assoc only
2553                                  * after we locked the create lock. This
2554                                  * means we are in a colliding case and we
2555                                  * must make sure that we unlock the tcb if
2556                                  * its one of the cases where we throw away
2557                                  * the incoming packets.
2558                                  */
2559                                 *locked_tcb = *stcb;
2560
2561                                 /*
2562                                  * We must also increment the inp ref count
2563                                  * since the ref_count flags was set when we
2564                                  * did not find the TCB, now we found it
2565                                  * which reduces the refcount.. we must
2566                                  * raise it back out to balance it all :-)
2567                                  */
2568                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2569                                 if ((*stcb)->sctp_ep != l_inp) {
2570                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2571                                             (void *)(*stcb)->sctp_ep, (void *)l_inp);
2572                                 }
2573                         }
2574                 }
2575         }
2576
2577         cookie_len -= SCTP_SIGNATURE_SIZE;
2578         if (*stcb == NULL) {
2579                 /* this is the "normal" case... get a new TCB */
2580                 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
2581                     cookie, cookie_len, *inp_p,
2582                     netp, to, &notification,
2583                     auth_skipped, auth_offset, auth_len,
2584                     mflowtype, mflowid,
2585                     vrf_id, port);
2586         } else {
2587                 /* this is abnormal... cookie-echo on existing TCB */
2588                 had_a_existing_tcb = 1;
2589                 *stcb = sctp_process_cookie_existing(m, iphlen, offset,
2590                     src, dst, sh,
2591                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2592                     &notification, auth_skipped, auth_offset, auth_len,
2593                     mflowtype, mflowid,
2594                     vrf_id, port);
2595         }
2596
2597         if (*stcb == NULL) {
2598                 /* still no TCB... must be bad cookie-echo */
2599                 return (NULL);
2600         }
2601         if (*netp != NULL) {
2602                 (*netp)->flowtype = mflowtype;
2603                 (*netp)->flowid = mflowid;
2604         }
2605         /*
2606          * Ok, we built an association so confirm the address we sent the
2607          * INIT-ACK to.
2608          */
2609         netl = sctp_findnet(*stcb, to);
2610         /*
2611          * This code should in theory NOT run but
2612          */
2613         if (netl == NULL) {
2614                 /* TSNH! Huh, why do I need to add this address here? */
2615                 if (sctp_add_remote_addr(*stcb, to, NULL, port,
2616                     SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2617                         return (NULL);
2618                 }
2619                 netl = sctp_findnet(*stcb, to);
2620         }
2621         if (netl) {
2622                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2623                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2624                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2625                             netl);
2626                         send_int_conf = 1;
2627                 }
2628         }
2629         sctp_start_net_timers(*stcb);
2630         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2631                 if (!had_a_existing_tcb ||
2632                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2633                         /*
2634                          * If we have a NEW cookie or the connect never
2635                          * reached the connected state during collision we
2636                          * must do the TCP accept thing.
2637                          */
2638                         struct socket *so, *oso;
2639                         struct sctp_inpcb *inp;
2640
2641                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2642                                 /*
2643                                  * For a restart we will keep the same
2644                                  * socket, no need to do anything. I THINK!!
2645                                  */
2646                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2647                                 if (send_int_conf) {
2648                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2649                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2650                                 }
2651                                 return (m);
2652                         }
2653                         oso = (*inp_p)->sctp_socket;
2654                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2655                         SCTP_TCB_UNLOCK((*stcb));
2656                         CURVNET_SET(oso->so_vnet);
2657                         so = sonewconn(oso, 0
2658                             );
2659                         CURVNET_RESTORE();
2660                         SCTP_TCB_LOCK((*stcb));
2661                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2662
2663                         if (so == NULL) {
2664                                 struct mbuf *op_err;
2665
2666                                 /* Too many sockets */
2667                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2668                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2669                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2670                                     src, dst, sh, op_err,
2671                                     mflowtype, mflowid,
2672                                     vrf_id, port);
2673                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC,
2674                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
2675                                 return (NULL);
2676                         }
2677                         inp = (struct sctp_inpcb *)so->so_pcb;
2678                         SCTP_INP_INCR_REF(inp);
2679                         /*
2680                          * We add the unbound flag here so that if we get an
2681                          * soabort() before we get the move_pcb done, we
2682                          * will properly cleanup.
2683                          */
2684                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2685                             SCTP_PCB_FLAGS_CONNECTED |
2686                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2687                             SCTP_PCB_FLAGS_UNBOUND |
2688                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2689                             SCTP_PCB_FLAGS_DONT_WAKE);
2690                         inp->sctp_features = (*inp_p)->sctp_features;
2691                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2692                         inp->sctp_socket = so;
2693                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2694                         inp->max_cwnd = (*inp_p)->max_cwnd;
2695                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2696                         inp->ecn_supported = (*inp_p)->ecn_supported;
2697                         inp->prsctp_supported = (*inp_p)->prsctp_supported;
2698                         inp->auth_supported = (*inp_p)->auth_supported;
2699                         inp->asconf_supported = (*inp_p)->asconf_supported;
2700                         inp->reconfig_supported = (*inp_p)->reconfig_supported;
2701                         inp->nrsack_supported = (*inp_p)->nrsack_supported;
2702                         inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
2703                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2704                         inp->sctp_context = (*inp_p)->sctp_context;
2705                         inp->local_strreset_support = (*inp_p)->local_strreset_support;
2706                         inp->fibnum = (*inp_p)->fibnum;
2707                         inp->inp_starting_point_for_iterator = NULL;
2708                         /*
2709                          * copy in the authentication parameters from the
2710                          * original endpoint
2711                          */
2712                         if (inp->sctp_ep.local_hmacs)
2713                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2714                         inp->sctp_ep.local_hmacs =
2715                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2716                         if (inp->sctp_ep.local_auth_chunks)
2717                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2718                         inp->sctp_ep.local_auth_chunks =
2719                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2720
2721                         /*
2722                          * Now we must move it from one hash table to
2723                          * another and get the tcb in the right place.
2724                          */
2725
2726                         /*
2727                          * This is where the one-2-one socket is put into
2728                          * the accept state waiting for the accept!
2729                          */
2730                         if (*stcb) {
2731                                 SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE);
2732                         }
2733                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2734
2735                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2736                         SCTP_TCB_UNLOCK((*stcb));
2737
2738                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2739                             0);
2740                         SCTP_TCB_LOCK((*stcb));
2741                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2742
2743                         /*
2744                          * now we must check to see if we were aborted while
2745                          * the move was going on and the lock/unlock
2746                          * happened.
2747                          */
2748                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2749                                 /*
2750                                  * yep it was, we leave the assoc attached
2751                                  * to the socket since the sctp_inpcb_free()
2752                                  * call will send an abort for us.
2753                                  */
2754                                 SCTP_INP_DECR_REF(inp);
2755                                 return (NULL);
2756                         }
2757                         SCTP_INP_DECR_REF(inp);
2758                         /* Switch over to the new guy */
2759                         *inp_p = inp;
2760                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2761                         if (send_int_conf) {
2762                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2763                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2764                         }
2765
2766                         /*
2767                          * Pull it from the incomplete queue and wake the
2768                          * guy
2769                          */
2770                         soisconnected(so);
2771                         return (m);
2772                 }
2773         }
2774         if (notification) {
2775                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2776         }
2777         if (send_int_conf) {
2778                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2779                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2780         }
2781         return (m);
2782 }
2783
2784 static void
2785 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2786     struct sctp_tcb *stcb, struct sctp_nets *net)
2787 {
2788         /* cp must not be used, others call this without a c-ack :-) */
2789         struct sctp_association *asoc;
2790         struct sctp_tmit_chunk *chk;
2791
2792         SCTPDBG(SCTP_DEBUG_INPUT2,
2793             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2794         if ((stcb == NULL) || (net == NULL)) {
2795                 return;
2796         }
2797
2798         asoc = &stcb->asoc;
2799         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
2800                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
2801                     asoc->overall_error_count,
2802                     0,
2803                     SCTP_FROM_SCTP_INPUT,
2804                     __LINE__);
2805         }
2806         asoc->overall_error_count = 0;
2807         sctp_stop_all_cookie_timers(stcb);
2808         /* process according to association state */
2809         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) {
2810                 /* state change only needed when I am in right state */
2811                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2812                 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
2813                 sctp_start_net_timers(stcb);
2814                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2815                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2816                             stcb->sctp_ep, stcb, NULL);
2817                 }
2818                 /* update RTO */
2819                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2820                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2821                 if (asoc->overall_error_count == 0) {
2822                         sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered,
2823                             SCTP_RTT_FROM_NON_DATA);
2824                 }
2825                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2826                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2827                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2828                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2829                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2830                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
2831                                 soisconnected(stcb->sctp_socket);
2832                         }
2833                 }
2834                 /*
2835                  * since we did not send a HB make sure we don't double
2836                  * things
2837                  */
2838                 net->hb_responded = 1;
2839
2840                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2841                         /*
2842                          * We don't need to do the asconf thing, nor hb or
2843                          * autoclose if the socket is closed.
2844                          */
2845                         goto closed_socket;
2846                 }
2847
2848                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2849                     stcb, net);
2850
2851                 if (stcb->asoc.sctp_autoclose_ticks &&
2852                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2853                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2854                             stcb->sctp_ep, stcb, NULL);
2855                 }
2856                 /*
2857                  * send ASCONF if parameters are pending and ASCONFs are
2858                  * allowed (eg. addresses changed when init/cookie echo were
2859                  * in flight)
2860                  */
2861                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2862                     (stcb->asoc.asconf_supported == 1) &&
2863                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2864 #ifdef SCTP_TIMER_BASED_ASCONF
2865                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2866                             stcb->sctp_ep, stcb,
2867                             stcb->asoc.primary_destination);
2868 #else
2869                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2870                             SCTP_ADDR_NOT_LOCKED);
2871 #endif
2872                 }
2873         }
2874 closed_socket:
2875         /* Toss the cookie if I can */
2876         sctp_toss_old_cookies(stcb, asoc);
2877         /* Restart the timer if we have pending data */
2878         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
2879                 if (chk->whoTo != NULL) {
2880                         break;
2881                 }
2882         }
2883         if (chk != NULL) {
2884                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
2885         }
2886 }
2887
2888 static void
2889 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
2890     struct sctp_tcb *stcb)
2891 {
2892         struct sctp_nets *net;
2893         struct sctp_tmit_chunk *lchk;
2894         struct sctp_ecne_chunk bkup;
2895         uint8_t override_bit;
2896         uint32_t tsn, window_data_tsn;
2897         int len;
2898         unsigned int pkt_cnt;
2899
2900         len = ntohs(cp->ch.chunk_length);
2901         if ((len != sizeof(struct sctp_ecne_chunk)) &&
2902             (len != sizeof(struct old_sctp_ecne_chunk))) {
2903                 return;
2904         }
2905         if (len == sizeof(struct old_sctp_ecne_chunk)) {
2906                 /* Its the old format */
2907                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
2908                 bkup.num_pkts_since_cwr = htonl(1);
2909                 cp = &bkup;
2910         }
2911         SCTP_STAT_INCR(sctps_recvecne);
2912         tsn = ntohl(cp->tsn);
2913         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
2914         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
2915         if (lchk == NULL) {
2916                 window_data_tsn = stcb->asoc.sending_seq - 1;
2917         } else {
2918                 window_data_tsn = lchk->rec.data.tsn;
2919         }
2920
2921         /* Find where it was sent to if possible. */
2922         net = NULL;
2923         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
2924                 if (lchk->rec.data.tsn == tsn) {
2925                         net = lchk->whoTo;
2926                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
2927                         break;
2928                 }
2929                 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) {
2930                         break;
2931                 }
2932         }
2933         if (net == NULL) {
2934                 /*
2935                  * What to do. A previous send of a CWR was possibly lost.
2936                  * See how old it is, we may have it marked on the actual
2937                  * net.
2938                  */
2939                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
2940                         if (tsn == net->last_cwr_tsn) {
2941                                 /* Found him, send it off */
2942                                 break;
2943                         }
2944                 }
2945                 if (net == NULL) {
2946                         /*
2947                          * If we reach here, we need to send a special CWR
2948                          * that says hey, we did this a long time ago and
2949                          * you lost the response.
2950                          */
2951                         net = TAILQ_FIRST(&stcb->asoc.nets);
2952                         if (net == NULL) {
2953                                 /* TSNH */
2954                                 return;
2955                         }
2956                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
2957                 } else {
2958                         override_bit = 0;
2959                 }
2960         } else {
2961                 override_bit = 0;
2962         }
2963         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
2964             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
2965                 /*
2966                  * JRS - Use the congestion control given in the pluggable
2967                  * CC module
2968                  */
2969                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
2970                 /*
2971                  * We reduce once every RTT. So we will only lower cwnd at
2972                  * the next sending seq i.e. the window_data_tsn
2973                  */
2974                 net->cwr_window_tsn = window_data_tsn;
2975                 net->ecn_ce_pkt_cnt += pkt_cnt;
2976                 net->lost_cnt = pkt_cnt;
2977                 net->last_cwr_tsn = tsn;
2978         } else {
2979                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
2980                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
2981                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
2982                         /*
2983                          * Another loss in the same window update how many
2984                          * marks/packets lost we have had.
2985                          */
2986                         int cnt = 1;
2987
2988                         if (pkt_cnt > net->lost_cnt) {
2989                                 /* Should be the case */
2990                                 cnt = (pkt_cnt - net->lost_cnt);
2991                                 net->ecn_ce_pkt_cnt += cnt;
2992                         }
2993                         net->lost_cnt = pkt_cnt;
2994                         net->last_cwr_tsn = tsn;
2995                         /*
2996                          * Most CC functions will ignore this call, since we
2997                          * are in-window yet of the initial CE the peer saw.
2998                          */
2999                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
3000                 }
3001         }
3002         /*
3003          * We always send a CWR this way if our previous one was lost our
3004          * peer will get an update, or if it is not time again to reduce we
3005          * still get the cwr to the peer. Note we set the override when we
3006          * could not find the TSN on the chunk or the destination network.
3007          */
3008         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
3009 }
3010
3011 static void
3012 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3013 {
3014         /*
3015          * Here we get a CWR from the peer. We must look in the outqueue and
3016          * make sure that we have a covered ECNE in the control chunk part.
3017          * If so remove it.
3018          */
3019         struct sctp_tmit_chunk *chk, *nchk;
3020         struct sctp_ecne_chunk *ecne;
3021         int override;
3022         uint32_t cwr_tsn;
3023
3024         cwr_tsn = ntohl(cp->tsn);
3025         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3026         TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) {
3027                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3028                         continue;
3029                 }
3030                 if ((override == 0) && (chk->whoTo != net)) {
3031                         /* Must be from the right src unless override is set */
3032                         continue;
3033                 }
3034                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3035                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3036                         /* this covers this ECNE, we can remove it */
3037                         stcb->asoc.ecn_echo_cnt_onq--;
3038                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3039                             sctp_next);
3040                         stcb->asoc.ctrl_queue_cnt--;
3041                         sctp_m_freem(chk->data);
3042                         chk->data = NULL;
3043                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3044                         if (override == 0) {
3045                                 break;
3046                         }
3047                 }
3048         }
3049 }
3050
3051 static void
3052 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3053     struct sctp_tcb *stcb, struct sctp_nets *net)
3054 {
3055
3056         SCTPDBG(SCTP_DEBUG_INPUT2,
3057             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3058         if (stcb == NULL)
3059                 return;
3060
3061         /* process according to association state */
3062         if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3063                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3064                 SCTPDBG(SCTP_DEBUG_INPUT2,
3065                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3066                 SCTP_TCB_UNLOCK(stcb);
3067                 return;
3068         }
3069         /* notify upper layer protocol */
3070         if (stcb->sctp_socket) {
3071                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3072         }
3073 #ifdef INVARIANTS
3074         if (!TAILQ_EMPTY(&stcb->asoc.send_queue) ||
3075             !TAILQ_EMPTY(&stcb->asoc.sent_queue) ||
3076             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
3077                 panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
3078         }
3079 #endif
3080         /* stop the timer */
3081         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net,
3082             SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3083         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3084         /* free the TCB */
3085         SCTPDBG(SCTP_DEBUG_INPUT2,
3086             "sctp_handle_shutdown_complete: calls free-asoc\n");
3087         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
3088             SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3089         return;
3090 }
3091
3092 static int
3093 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3094     struct sctp_nets *net, uint8_t flg)
3095 {
3096         switch (desc->chunk_type) {
3097         case SCTP_DATA:
3098         case SCTP_IDATA:
3099                 /* find the tsn to resend (possibly) */
3100                 {
3101                         uint32_t tsn;
3102                         struct sctp_tmit_chunk *tp1;
3103
3104                         tsn = ntohl(desc->tsn_ifany);
3105                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3106                                 if (tp1->rec.data.tsn == tsn) {
3107                                         /* found it */
3108                                         break;
3109                                 }
3110                                 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) {
3111                                         /* not found */
3112                                         tp1 = NULL;
3113                                         break;
3114                                 }
3115                         }
3116                         if (tp1 == NULL) {
3117                                 /*
3118                                  * Do it the other way , aka without paying
3119                                  * attention to queue seq order.
3120                                  */
3121                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3122                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3123                                         if (tp1->rec.data.tsn == tsn) {
3124                                                 /* found it */
3125                                                 break;
3126                                         }
3127                                 }
3128                         }
3129                         if (tp1 == NULL) {
3130                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3131                         }
3132                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3133                                 if (((flg & SCTP_BADCRC) == 0) &&
3134                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3135                                         return (0);
3136                                 }
3137                                 if ((stcb->asoc.peers_rwnd == 0) &&
3138                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3139                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3140                                         return (0);
3141                                 }
3142                                 if (stcb->asoc.peers_rwnd == 0 &&
3143                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3144                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3145                                         return (0);
3146                                 }
3147                                 if ((uint32_t)SCTP_BUF_LEN(tp1->data) <
3148                                     SCTP_DATA_CHUNK_OVERHEAD(stcb) + SCTP_NUM_DB_TO_VERIFY) {
3149                                         /* Payload not matching. */
3150                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3151                                         return (-1);
3152                                 }
3153                                 if (memcmp(mtod(tp1->data, caddr_t)+SCTP_DATA_CHUNK_OVERHEAD(stcb),
3154                                     desc->data_bytes, SCTP_NUM_DB_TO_VERIFY) != 0) {
3155                                         /* Payload not matching. */
3156                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3157                                         return (-1);
3158                                 }
3159                                 if (tp1->do_rtt) {
3160                                         /*
3161                                          * this guy had a RTO calculation
3162                                          * pending on it, cancel it
3163                                          */
3164                                         if (tp1->whoTo->rto_needed == 0) {
3165                                                 tp1->whoTo->rto_needed = 1;
3166                                         }
3167                                         tp1->do_rtt = 0;
3168                                 }
3169                                 SCTP_STAT_INCR(sctps_pdrpmark);
3170                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3171                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3172                                 /*
3173                                  * mark it as if we were doing a FR, since
3174                                  * we will be getting gap ack reports behind
3175                                  * the info from the router.
3176                                  */
3177                                 tp1->rec.data.doing_fast_retransmit = 1;
3178                                 /*
3179                                  * mark the tsn with what sequences can
3180                                  * cause a new FR.
3181                                  */
3182                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3183                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3184                                 } else {
3185                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn;
3186                                 }
3187
3188                                 /* restart the timer */
3189                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3190                                     stcb, tp1->whoTo,
3191                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3192                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3193                                     stcb, tp1->whoTo);
3194
3195                                 /* fix counts and things */
3196                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3197                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3198                                             tp1->whoTo->flight_size,
3199                                             tp1->book_size,
3200                                             (uint32_t)(uintptr_t)stcb,
3201                                             tp1->rec.data.tsn);
3202                                 }
3203                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3204                                         sctp_flight_size_decrease(tp1);
3205                                         sctp_total_flight_decrease(stcb, tp1);
3206                                 }
3207                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3208                         } {
3209                                 /* audit code */
3210                                 unsigned int audit;
3211
3212                                 audit = 0;
3213                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3214                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3215                                                 audit++;
3216                                 }
3217                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3218                                     sctp_next) {
3219                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3220                                                 audit++;
3221                                 }
3222                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3223                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3224                                             audit, stcb->asoc.sent_queue_retran_cnt);
3225 #ifndef SCTP_AUDITING_ENABLED
3226                                         stcb->asoc.sent_queue_retran_cnt = audit;
3227 #endif
3228                                 }
3229                         }
3230                 }
3231                 break;
3232         case SCTP_ASCONF:
3233                 {
3234                         struct sctp_tmit_chunk *asconf;
3235
3236                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3237                             sctp_next) {
3238                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3239                                         break;
3240                                 }
3241                         }
3242                         if (asconf) {
3243                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3244                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3245                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3246                                 asconf->snd_count--;
3247                         }
3248                 }
3249                 break;
3250         case SCTP_INITIATION:
3251                 /* resend the INIT */
3252                 stcb->asoc.dropped_special_cnt++;
3253                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3254                         /*
3255                          * If we can get it in, in a few attempts we do
3256                          * this, otherwise we let the timer fire.
3257                          */
3258                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3259                             stcb, net,
3260                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
3261                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3262                 }
3263                 break;
3264         case SCTP_SELECTIVE_ACK:
3265         case SCTP_NR_SELECTIVE_ACK:
3266                 /* resend the sack */
3267                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3268                 break;
3269         case SCTP_HEARTBEAT_REQUEST:
3270                 /* resend a demand HB */
3271                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3272                         /*
3273                          * Only retransmit if we KNOW we wont destroy the
3274                          * tcb
3275                          */
3276                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3277                 }
3278                 break;
3279         case SCTP_SHUTDOWN:
3280                 sctp_send_shutdown(stcb, net);
3281                 break;
3282         case SCTP_SHUTDOWN_ACK:
3283                 sctp_send_shutdown_ack(stcb, net);
3284                 break;
3285         case SCTP_COOKIE_ECHO:
3286                 {
3287                         struct sctp_tmit_chunk *cookie;
3288
3289                         cookie = NULL;
3290                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3291                             sctp_next) {
3292                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3293                                         break;
3294                                 }
3295                         }
3296                         if (cookie) {
3297                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3298                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3299                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3300                                 sctp_stop_all_cookie_timers(stcb);
3301                         }
3302                 }
3303                 break;
3304         case SCTP_COOKIE_ACK:
3305                 sctp_send_cookie_ack(stcb);
3306                 break;
3307         case SCTP_ASCONF_ACK:
3308                 /* resend last asconf ack */
3309                 sctp_send_asconf_ack(stcb);
3310                 break;
3311         case SCTP_IFORWARD_CUM_TSN:
3312         case SCTP_FORWARD_CUM_TSN:
3313                 send_forward_tsn(stcb, &stcb->asoc);
3314                 break;
3315                 /* can't do anything with these */
3316         case SCTP_PACKET_DROPPED:
3317         case SCTP_INITIATION_ACK:       /* this should not happen */
3318         case SCTP_HEARTBEAT_ACK:
3319         case SCTP_ABORT_ASSOCIATION:
3320         case SCTP_OPERATION_ERROR:
3321         case SCTP_SHUTDOWN_COMPLETE:
3322         case SCTP_ECN_ECHO:
3323         case SCTP_ECN_CWR:
3324         default:
3325                 break;
3326         }
3327         return (0);
3328 }
3329
3330 void
3331 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3332 {
3333         uint32_t i;
3334         uint16_t temp;
3335
3336         /*
3337          * We set things to 0xffffffff since this is the last delivered
3338          * sequence and we will be sending in 0 after the reset.
3339          */
3340
3341         if (number_entries) {
3342                 for (i = 0; i < number_entries; i++) {
3343                         temp = ntohs(list[i]);
3344                         if (temp >= stcb->asoc.streamincnt) {
3345                                 continue;
3346                         }
3347                         stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff;
3348                 }
3349         } else {
3350                 list = NULL;
3351                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3352                         stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
3353                 }
3354         }
3355         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3356 }
3357
3358 static void
3359 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3360 {
3361         uint32_t i;
3362         uint16_t temp;
3363
3364         if (number_entries > 0) {
3365                 for (i = 0; i < number_entries; i++) {
3366                         temp = ntohs(list[i]);
3367                         if (temp >= stcb->asoc.streamoutcnt) {
3368                                 /* no such stream */
3369                                 continue;
3370                         }
3371                         stcb->asoc.strmout[temp].next_mid_ordered = 0;
3372                         stcb->asoc.strmout[temp].next_mid_unordered = 0;
3373                 }
3374         } else {
3375                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3376                         stcb->asoc.strmout[i].next_mid_ordered = 0;
3377                         stcb->asoc.strmout[i].next_mid_unordered = 0;
3378                 }
3379         }
3380         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3381 }
3382
3383 static void
3384 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3385 {
3386         uint32_t i;
3387         uint16_t temp;
3388
3389         if (number_entries > 0) {
3390                 for (i = 0; i < number_entries; i++) {
3391                         temp = ntohs(list[i]);
3392                         if (temp >= stcb->asoc.streamoutcnt) {
3393                                 /* no such stream */
3394                                 continue;
3395                         }
3396                         stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN;
3397                 }
3398         } else {
3399                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3400                         stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN;
3401                 }
3402         }
3403 }
3404
3405 struct sctp_stream_reset_request *
3406 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3407 {
3408         struct sctp_association *asoc;
3409         struct sctp_chunkhdr *ch;
3410         struct sctp_stream_reset_request *r;
3411         struct sctp_tmit_chunk *chk;
3412         int len, clen;
3413
3414         asoc = &stcb->asoc;
3415         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3416                 asoc->stream_reset_outstanding = 0;
3417                 return (NULL);
3418         }
3419         if (stcb->asoc.str_reset == NULL) {
3420                 asoc->stream_reset_outstanding = 0;
3421                 return (NULL);
3422         }
3423         chk = stcb->asoc.str_reset;
3424         if (chk->data == NULL) {
3425                 return (NULL);
3426         }
3427         if (bchk) {
3428                 /* he wants a copy of the chk pointer */
3429                 *bchk = chk;
3430         }
3431         clen = chk->send_size;
3432         ch = mtod(chk->data, struct sctp_chunkhdr *);
3433         r = (struct sctp_stream_reset_request *)(ch + 1);
3434         if (ntohl(r->request_seq) == seq) {
3435                 /* found it */
3436                 return (r);
3437         }
3438         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3439         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3440                 /* move to the next one, there can only be a max of two */
3441                 r = (struct sctp_stream_reset_request *)((caddr_t)r + len);
3442                 if (ntohl(r->request_seq) == seq) {
3443                         return (r);
3444                 }
3445         }
3446         /* that seq is not here */
3447         return (NULL);
3448 }
3449
3450 static void
3451 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3452 {
3453         struct sctp_association *asoc;
3454         struct sctp_tmit_chunk *chk;
3455
3456         asoc = &stcb->asoc;
3457         chk = asoc->str_reset;
3458         if (chk == NULL) {
3459                 return;
3460         }
3461         asoc->str_reset = NULL;
3462         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb,
3463             NULL, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28);
3464         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
3465         asoc->ctrl_queue_cnt--;
3466         if (chk->data) {
3467                 sctp_m_freem(chk->data);
3468                 chk->data = NULL;
3469         }
3470         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3471 }
3472
3473 static int
3474 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3475     uint32_t seq, uint32_t action,
3476     struct sctp_stream_reset_response *respin)
3477 {
3478         uint16_t type;
3479         int lparam_len;
3480         struct sctp_association *asoc = &stcb->asoc;
3481         struct sctp_tmit_chunk *chk;
3482         struct sctp_stream_reset_request *req_param;
3483         struct sctp_stream_reset_out_request *req_out_param;
3484         struct sctp_stream_reset_in_request *req_in_param;
3485         uint32_t number_entries;
3486
3487         if (asoc->stream_reset_outstanding == 0) {
3488                 /* duplicate */
3489                 return (0);
3490         }
3491         if (seq == stcb->asoc.str_reset_seq_out) {
3492                 req_param = sctp_find_stream_reset(stcb, seq, &chk);
3493                 if (req_param != NULL) {
3494                         stcb->asoc.str_reset_seq_out++;
3495                         type = ntohs(req_param->ph.param_type);
3496                         lparam_len = ntohs(req_param->ph.param_length);
3497                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3498                                 int no_clear = 0;
3499
3500                                 req_out_param = (struct sctp_stream_reset_out_request *)req_param;
3501                                 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3502                                 asoc->stream_reset_out_is_outstanding = 0;
3503                                 if (asoc->stream_reset_outstanding)
3504                                         asoc->stream_reset_outstanding--;
3505                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3506                                         /* do it */
3507                                         sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
3508                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3509                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3510                                 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) {
3511                                         /*
3512                                          * Set it up so we don't stop
3513                                          * retransmitting
3514                                          */
3515                                         asoc->stream_reset_outstanding++;
3516                                         stcb->asoc.str_reset_seq_out--;
3517                                         asoc->stream_reset_out_is_outstanding = 1;
3518                                         no_clear = 1;
3519                                 } else {
3520                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3521                                 }
3522                                 if (no_clear == 0) {
3523                                         sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams);
3524                                 }
3525                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3526                                 req_in_param = (struct sctp_stream_reset_in_request *)req_param;
3527                                 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3528                                 if (asoc->stream_reset_outstanding)
3529                                         asoc->stream_reset_outstanding--;
3530                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3531                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3532                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3533                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3534                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3535                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3536                                 }
3537                         } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3538                                 /* Ok we now may have more streams */
3539                                 int num_stream;
3540
3541                                 num_stream = stcb->asoc.strm_pending_add_size;
3542                                 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3543                                         /* TSNH */
3544                                         num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3545                                 }
3546                                 stcb->asoc.strm_pending_add_size = 0;
3547                                 if (asoc->stream_reset_outstanding)
3548                                         asoc->stream_reset_outstanding--;
3549                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3550                                         /* Put the new streams into effect */
3551                                         int i;
3552
3553                                         for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) {
3554                                                 asoc->strmout[i].state = SCTP_STREAM_OPEN;
3555                                         }
3556                                         asoc->streamoutcnt += num_stream;
3557                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3558                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3559                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3560                                             SCTP_STREAM_CHANGE_DENIED);
3561                                 } else {
3562                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3563                                             SCTP_STREAM_CHANGE_FAILED);
3564                                 }
3565                         } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3566                                 if (asoc->stream_reset_outstanding)
3567                                         asoc->stream_reset_outstanding--;
3568                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3569                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3570                                             SCTP_STREAM_CHANGE_DENIED);
3571                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3572                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3573                                             SCTP_STREAM_CHANGE_FAILED);
3574                                 }
3575                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3576                                 /**
3577                                  * a) Adopt the new in tsn.
3578                                  * b) reset the map
3579                                  * c) Adopt the new out-tsn
3580                                  */
3581                                 struct sctp_stream_reset_response_tsn *resp;
3582                                 struct sctp_forward_tsn_chunk fwdtsn;
3583                                 int abort_flag = 0;
3584
3585                                 if (respin == NULL) {
3586                                         /* huh ? */
3587                                         return (0);
3588                                 }
3589                                 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
3590                                         return (0);
3591                                 }
3592                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3593                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3594                                         asoc->stream_reset_outstanding--;
3595                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3596                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3597                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3598                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3599                                         if (abort_flag) {
3600                                                 return (1);
3601                                         }
3602                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3603                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3604                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3605                                         }
3606
3607                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3608                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3609                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3610
3611                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3612                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3613
3614                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3615                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3616
3617                                         sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3618                                         sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3619                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3620                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3621                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3622                                             SCTP_ASSOC_RESET_DENIED);
3623                                 } else {
3624                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3625                                             SCTP_ASSOC_RESET_FAILED);
3626                                 }
3627                         }
3628                         /* get rid of the request and get the request flags */
3629                         if (asoc->stream_reset_outstanding == 0) {
3630                                 sctp_clean_up_stream_reset(stcb);
3631                         }
3632                 }
3633         }
3634         if (asoc->stream_reset_outstanding == 0) {
3635                 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3636         }
3637         return (0);
3638 }
3639
3640 static void
3641 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3642     struct sctp_tmit_chunk *chk,
3643     struct sctp_stream_reset_in_request *req, int trunc)
3644 {
3645         uint32_t seq;
3646         int len, i;
3647         int number_entries;
3648         uint16_t temp;
3649
3650         /*
3651          * peer wants me to send a str-reset to him for my outgoing seq's if
3652          * seq_in is right.
3653          */
3654         struct sctp_association *asoc = &stcb->asoc;
3655
3656         seq = ntohl(req->request_seq);
3657         if (asoc->str_reset_seq_in == seq) {
3658                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3659                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3660                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3661                 } else if (trunc) {
3662                         /* Can't do it, since they exceeded our buffer size  */
3663                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3664                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3665                         len = ntohs(req->ph.param_length);
3666                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3667                         if (number_entries) {
3668                                 for (i = 0; i < number_entries; i++) {
3669                                         temp = ntohs(req->list_of_streams[i]);
3670                                         if (temp >= stcb->asoc.streamoutcnt) {
3671                                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3672                                                 goto bad_boy;
3673                                         }
3674                                         req->list_of_streams[i] = temp;
3675                                 }
3676                                 for (i = 0; i < number_entries; i++) {
3677                                         if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) {
3678                                                 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING;
3679                                         }
3680                                 }
3681                         } else {
3682                                 /* Its all */
3683                                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3684                                         if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN)
3685                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING;
3686                                 }
3687                         }
3688                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3689                 } else {
3690                         /* Can't do it, since we have sent one out */
3691                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3692                 }
3693 bad_boy:
3694                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3695                 asoc->str_reset_seq_in++;
3696         } else if (asoc->str_reset_seq_in - 1 == seq) {
3697                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3698         } else if (asoc->str_reset_seq_in - 2 == seq) {
3699                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3700         } else {
3701                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3702         }
3703         sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3704 }
3705
3706 static int
3707 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3708     struct sctp_tmit_chunk *chk,
3709     struct sctp_stream_reset_tsn_request *req)
3710 {
3711         /* reset all in and out and update the tsn */
3712         /*
3713          * A) reset my str-seq's on in and out. B) Select a receive next,
3714          * and set cum-ack to it. Also process this selected number as a
3715          * fwd-tsn as well. C) set in the response my next sending seq.
3716          */
3717         struct sctp_forward_tsn_chunk fwdtsn;
3718         struct sctp_association *asoc = &stcb->asoc;
3719         int abort_flag = 0;
3720         uint32_t seq;
3721
3722         seq = ntohl(req->request_seq);
3723         if (asoc->str_reset_seq_in == seq) {
3724                 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3725                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3726                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3727                 } else {
3728                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3729                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3730                         fwdtsn.ch.chunk_flags = 0;
3731                         fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3732                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3733                         if (abort_flag) {
3734                                 return (1);
3735                         }
3736                         asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3737                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3738                                 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3739                         }
3740                         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3741                         asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3742                         memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3743                         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3744                         memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3745                         atomic_add_int(&asoc->sending_seq, 1);
3746                         /* save off historical data for retrans */
3747                         asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3748                         asoc->last_sending_seq[0] = asoc->sending_seq;
3749                         asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3750                         asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3751                         sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3752                         sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3753                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3754                         sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3755                 }
3756                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3757                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3758                 asoc->str_reset_seq_in++;
3759         } else if (asoc->str_reset_seq_in - 1 == seq) {
3760                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3761                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3762         } else if (asoc->str_reset_seq_in - 2 == seq) {
3763                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3764                     asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3765         } else {
3766                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3767         }
3768         return (0);
3769 }
3770
3771 static void
3772 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3773     struct sctp_tmit_chunk *chk,
3774     struct sctp_stream_reset_out_request *req, int trunc)
3775 {
3776         uint32_t seq, tsn;
3777         int number_entries, len;
3778         struct sctp_association *asoc = &stcb->asoc;
3779
3780         seq = ntohl(req->request_seq);
3781
3782         /* now if its not a duplicate we process it */
3783         if (asoc->str_reset_seq_in == seq) {
3784                 len = ntohs(req->ph.param_length);
3785                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3786                 /*
3787                  * the sender is resetting, handle the list issue.. we must
3788                  * a) verify if we can do the reset, if so no problem b) If
3789                  * we can't do the reset we must copy the request. c) queue
3790                  * it, and setup the data in processor to trigger it off
3791                  * when needed and dequeue all the queued data.
3792                  */
3793                 tsn = ntohl(req->send_reset_at_tsn);
3794
3795                 /* move the reset action back one */
3796                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3797                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3798                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3799                 } else if (trunc) {
3800                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3801                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3802                         /* we can do it now */
3803                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3804                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3805                 } else {
3806                         /*
3807                          * we must queue it up and thus wait for the TSN's
3808                          * to arrive that are at or before tsn
3809                          */
3810                         struct sctp_stream_reset_list *liste;
3811                         int siz;
3812
3813                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3814                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3815                             siz, SCTP_M_STRESET);
3816                         if (liste == NULL) {
3817                                 /* gak out of memory */
3818                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3819                                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3820                                 return;
3821                         }
3822                         liste->seq = seq;
3823                         liste->tsn = tsn;
3824                         liste->number_entries = number_entries;
3825                         memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
3826                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3827                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS;
3828                 }
3829                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3830                 asoc->str_reset_seq_in++;
3831         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3832                 /*
3833                  * one seq back, just echo back last action since my
3834                  * response was lost.
3835                  */
3836                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3837         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3838                 /*
3839                  * two seq back, just echo back last action since my
3840                  * response was lost.
3841                  */
3842                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3843         } else {
3844                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3845         }
3846 }
3847
3848 static void
3849 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3850     struct sctp_stream_reset_add_strm *str_add)
3851 {
3852         /*
3853          * Peer is requesting to add more streams. If its within our
3854          * max-streams we will allow it.
3855          */
3856         uint32_t num_stream, i;
3857         uint32_t seq;
3858         struct sctp_association *asoc = &stcb->asoc;
3859         struct sctp_queued_to_read *ctl, *nctl;
3860
3861         /* Get the number. */
3862         seq = ntohl(str_add->request_seq);
3863         num_stream = ntohs(str_add->number_of_streams);
3864         /* Now what would be the new total? */
3865         if (asoc->str_reset_seq_in == seq) {
3866                 num_stream += stcb->asoc.streamincnt;
3867                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3868                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3869                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3870                 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
3871                     (num_stream > 0xffff)) {
3872                         /* We must reject it they ask for to many */
3873         denied:
3874                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3875                 } else {
3876                         /* Ok, we can do that :-) */
3877                         struct sctp_stream_in *oldstrm;
3878
3879                         /* save off the old */
3880                         oldstrm = stcb->asoc.strmin;
3881                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
3882                             (num_stream * sizeof(struct sctp_stream_in)),
3883                             SCTP_M_STRMI);
3884                         if (stcb->asoc.strmin == NULL) {
3885                                 stcb->asoc.strmin = oldstrm;
3886                                 goto denied;
3887                         }
3888                         /* copy off the old data */
3889                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
3890                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3891                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
3892                                 stcb->asoc.strmin[i].sid = i;
3893                                 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered;
3894                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
3895                                 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started;
3896                                 /* now anything on those queues? */
3897                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) {
3898                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm);
3899                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm);
3900                                 }
3901                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) {
3902                                         TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm);
3903                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm);
3904                                 }
3905                         }
3906                         /* Init the new streams */
3907                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
3908                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3909                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
3910                                 stcb->asoc.strmin[i].sid = i;
3911                                 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
3912                                 stcb->asoc.strmin[i].pd_api_started = 0;
3913                                 stcb->asoc.strmin[i].delivery_started = 0;
3914                         }
3915                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
3916                         /* update the size */
3917                         stcb->asoc.streamincnt = num_stream;
3918                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3919                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3920                 }
3921                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3922                 asoc->str_reset_seq_in++;
3923         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3924                 /*
3925                  * one seq back, just echo back last action since my
3926                  * response was lost.
3927                  */
3928                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3929         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3930                 /*
3931                  * two seq back, just echo back last action since my
3932                  * response was lost.
3933                  */
3934                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3935         } else {
3936                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3937         }
3938 }
3939
3940 static void
3941 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3942     struct sctp_stream_reset_add_strm *str_add)
3943 {
3944         /*
3945          * Peer is requesting to add more streams. If its within our
3946          * max-streams we will allow it.
3947          */
3948         uint16_t num_stream;
3949         uint32_t seq;
3950         struct sctp_association *asoc = &stcb->asoc;
3951
3952         /* Get the number. */
3953         seq = ntohl(str_add->request_seq);
3954         num_stream = ntohs(str_add->number_of_streams);
3955         /* Now what would be the new total? */
3956         if (asoc->str_reset_seq_in == seq) {
3957                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3958                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3959                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3960                 } else if (stcb->asoc.stream_reset_outstanding) {
3961                         /* We must reject it we have something pending */
3962                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3963                 } else {
3964                         /* Ok, we can do that :-) */
3965                         int mychk;
3966
3967                         mychk = stcb->asoc.streamoutcnt;
3968                         mychk += num_stream;
3969                         if (mychk < 0x10000) {
3970                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3971                                 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) {
3972                                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3973                                 }
3974                         } else {
3975                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3976                         }
3977                 }
3978                 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
3979                 asoc->str_reset_seq_in++;
3980         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3981                 /*
3982                  * one seq back, just echo back last action since my
3983                  * response was lost.
3984                  */
3985                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3986         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3987                 /*
3988                  * two seq back, just echo back last action since my
3989                  * response was lost.
3990                  */
3991                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3992         } else {
3993                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3994         }
3995 }
3996
3997 #ifdef __GNUC__
3998 __attribute__((noinline))
3999 #endif
4000 static int
4001 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
4002     struct sctp_chunkhdr *ch_req)
4003 {
4004         uint16_t remaining_length, param_len, ptype;
4005         struct sctp_paramhdr pstore;
4006         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
4007         uint32_t seq = 0;
4008         int num_req = 0;
4009         int trunc = 0;
4010         struct sctp_tmit_chunk *chk;
4011         struct sctp_chunkhdr *ch;
4012         struct sctp_paramhdr *ph;
4013         int ret_code = 0;
4014         int num_param = 0;
4015
4016         /* now it may be a reset or a reset-response */
4017         remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
4018
4019         /* setup for adding the response */
4020         sctp_alloc_a_chunk(stcb, chk);
4021         if (chk == NULL) {
4022                 return (ret_code);
4023         }
4024         chk->copy_by_ref = 0;
4025         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
4026         chk->rec.chunk_id.can_take_data = 0;
4027         chk->flags = 0;
4028         chk->asoc = &stcb->asoc;
4029         chk->no_fr_allowed = 0;
4030         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
4031         chk->book_size_scale = 0;
4032         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
4033         if (chk->data == NULL) {
4034 strres_nochunk:
4035                 if (chk->data) {
4036                         sctp_m_freem(chk->data);
4037                         chk->data = NULL;
4038                 }
4039                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
4040                 return (ret_code);
4041         }
4042         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
4043
4044         /* setup chunk parameters */
4045         chk->sent = SCTP_DATAGRAM_UNSENT;
4046         chk->snd_count = 0;
4047         chk->whoTo = NULL;
4048
4049         ch = mtod(chk->data, struct sctp_chunkhdr *);
4050         ch->chunk_type = SCTP_STREAM_RESET;
4051         ch->chunk_flags = 0;
4052         ch->chunk_length = htons(chk->send_size);
4053         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4054         offset += sizeof(struct sctp_chunkhdr);
4055         while (remaining_length >= sizeof(struct sctp_paramhdr)) {
4056                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore);
4057                 if (ph == NULL) {
4058                         /* TSNH */
4059                         break;
4060                 }
4061                 param_len = ntohs(ph->param_length);
4062                 if ((param_len > remaining_length) ||
4063                     (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
4064                         /* bad parameter length */
4065                         break;
4066                 }
4067                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
4068                     (uint8_t *)&cstore);
4069                 if (ph == NULL) {
4070                         /* TSNH */
4071                         break;
4072                 }
4073                 ptype = ntohs(ph->param_type);
4074                 num_param++;
4075                 if (param_len > sizeof(cstore)) {
4076                         trunc = 1;
4077                 } else {
4078                         trunc = 0;
4079                 }
4080                 if (num_param > SCTP_MAX_RESET_PARAMS) {
4081                         /* hit the max of parameters already sorry.. */
4082                         break;
4083                 }
4084                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4085                         struct sctp_stream_reset_out_request *req_out;
4086
4087                         if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
4088                                 break;
4089                         }
4090                         req_out = (struct sctp_stream_reset_out_request *)ph;
4091                         num_req++;
4092                         if (stcb->asoc.stream_reset_outstanding) {
4093                                 seq = ntohl(req_out->response_seq);
4094                                 if (seq == stcb->asoc.str_reset_seq_out) {
4095                                         /* implicit ack */
4096                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4097                                 }
4098                         }
4099                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4100                 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4101                         struct sctp_stream_reset_add_strm *str_add;
4102
4103                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4104                                 break;
4105                         }
4106                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4107                         num_req++;
4108                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4109                 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4110                         struct sctp_stream_reset_add_strm *str_add;
4111
4112                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4113                                 break;
4114                         }
4115                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4116                         num_req++;
4117                         sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4118                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4119                         struct sctp_stream_reset_in_request *req_in;
4120
4121                         num_req++;
4122                         req_in = (struct sctp_stream_reset_in_request *)ph;
4123                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4124                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4125                         struct sctp_stream_reset_tsn_request *req_tsn;
4126
4127                         num_req++;
4128                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4129                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4130                                 ret_code = 1;
4131                                 goto strres_nochunk;
4132                         }
4133                         /* no more */
4134                         break;
4135                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4136                         struct sctp_stream_reset_response *resp;
4137                         uint32_t result;
4138
4139                         if (param_len < sizeof(struct sctp_stream_reset_response)) {
4140                                 break;
4141                         }
4142                         resp = (struct sctp_stream_reset_response *)ph;
4143                         seq = ntohl(resp->response_seq);
4144                         result = ntohl(resp->result);
4145                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4146                                 ret_code = 1;
4147                                 goto strres_nochunk;
4148                         }
4149                 } else {
4150                         break;
4151                 }
4152                 offset += SCTP_SIZE32(param_len);
4153                 if (remaining_length >= SCTP_SIZE32(param_len)) {
4154                         remaining_length -= SCTP_SIZE32(param_len);
4155                 } else {
4156                         remaining_length = 0;
4157                 }
4158         }
4159         if (num_req == 0) {
4160                 /* we have no response free the stuff */
4161                 goto strres_nochunk;
4162         }
4163         /* ok we have a chunk to link in */
4164         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4165             chk,
4166             sctp_next);
4167         stcb->asoc.ctrl_queue_cnt++;
4168         return (ret_code);
4169 }
4170
4171 /*
4172  * Handle a router or endpoints report of a packet loss, there are two ways
4173  * to handle this, either we get the whole packet and must disect it
4174  * ourselves (possibly with truncation and or corruption) or it is a summary
4175  * from a middle box that did the disectting for us.
4176  */
4177 static void
4178 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4179     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4180 {
4181         struct sctp_chunk_desc desc;
4182         struct sctp_chunkhdr *chk_hdr;
4183         struct sctp_data_chunk *data_chunk;
4184         struct sctp_idata_chunk *idata_chunk;
4185         uint32_t bottle_bw, on_queue;
4186         uint32_t offset, chk_len;
4187         uint16_t pktdrp_len;
4188         uint8_t pktdrp_flags;
4189
4190         KASSERT(sizeof(struct sctp_pktdrop_chunk) <= limit,
4191             ("PKTDROP chunk too small"));
4192         pktdrp_flags = cp->ch.chunk_flags;
4193         pktdrp_len = ntohs(cp->ch.chunk_length);
4194         KASSERT(limit <= pktdrp_len, ("Inconsistent limit"));
4195         if (pktdrp_flags & SCTP_PACKET_TRUNCATED) {
4196                 if (ntohs(cp->trunc_len) <= pktdrp_len - sizeof(struct sctp_pktdrop_chunk)) {
4197                         /* The peer plays games with us. */
4198                         return;
4199                 }
4200         }
4201         limit -= sizeof(struct sctp_pktdrop_chunk);
4202         offset = 0;
4203         if (offset == limit) {
4204                 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4205                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4206                 }
4207         } else if (offset + sizeof(struct sctphdr) > limit) {
4208                 /* Only a partial SCTP common header. */
4209                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4210                 offset = limit;
4211         } else {
4212                 /* XXX: Check embedded SCTP common header. */
4213                 offset += sizeof(struct sctphdr);
4214         }
4215         /* Now parse through the chunks themselves. */
4216         while (offset < limit) {
4217                 if (offset + sizeof(struct sctp_chunkhdr) > limit) {
4218                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4219                         break;
4220                 }
4221                 chk_hdr = (struct sctp_chunkhdr *)(cp->data + offset);
4222                 desc.chunk_type = chk_hdr->chunk_type;
4223                 /* get amount we need to move */
4224                 chk_len = (uint32_t)ntohs(chk_hdr->chunk_length);
4225                 if (chk_len < sizeof(struct sctp_chunkhdr)) {
4226                         /* Someone is lying... */
4227                         break;
4228                 }
4229                 if (desc.chunk_type == SCTP_DATA) {
4230                         if (stcb->asoc.idata_supported) {
4231                                 /* Some is playing games with us. */
4232                                 break;
4233                         }
4234                         if (chk_len <= sizeof(struct sctp_data_chunk)) {
4235                                 /* Some is playing games with us. */
4236                                 break;
4237                         }
4238                         if (chk_len < sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY) {
4239                                 /*
4240                                  * Not enough data bytes available in the
4241                                  * chunk.
4242                                  */
4243                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4244                                 goto next_chunk;
4245                         }
4246                         if (offset + sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) {
4247                                 /* Not enough data in buffer. */
4248                                 break;
4249                         }
4250                         data_chunk = (struct sctp_data_chunk *)(cp->data + offset);
4251                         memcpy(desc.data_bytes, data_chunk + 1, SCTP_NUM_DB_TO_VERIFY);
4252                         desc.tsn_ifany = data_chunk->dp.tsn;
4253                         if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4254                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4255                         }
4256                 } else if (desc.chunk_type == SCTP_IDATA) {
4257                         if (!stcb->asoc.idata_supported) {
4258                                 /* Some is playing games with us. */
4259                                 break;
4260                         }
4261                         if (chk_len <= sizeof(struct sctp_idata_chunk)) {
4262                                 /* Some is playing games with us. */
4263                                 break;
4264                         }
4265                         if (chk_len < sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY) {
4266                                 /*
4267                                  * Not enough data bytes available in the
4268                                  * chunk.
4269                                  */
4270                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4271                                 goto next_chunk;
4272                         }
4273                         if (offset + sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) {
4274                                 /* Not enough data in buffer. */
4275                                 break;
4276                         }
4277                         idata_chunk = (struct sctp_idata_chunk *)(cp->data + offset);
4278                         memcpy(desc.data_bytes, idata_chunk + 1, SCTP_NUM_DB_TO_VERIFY);
4279                         desc.tsn_ifany = idata_chunk->dp.tsn;
4280                         if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4281                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4282                         }
4283                 } else {
4284                         if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4285                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4286                         }
4287                 }
4288                 if (process_chunk_drop(stcb, &desc, net, pktdrp_flags)) {
4289                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4290                         break;
4291                 }
4292 next_chunk:
4293                 offset += SCTP_SIZE32(chk_len);
4294         }
4295         /* Now update any rwnd --- possibly */
4296         if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4297                 /* From a peer, we get a rwnd report */
4298                 uint32_t a_rwnd;
4299
4300                 SCTP_STAT_INCR(sctps_pdrpfehos);
4301
4302                 bottle_bw = ntohl(cp->bottle_bw);
4303                 on_queue = ntohl(cp->current_onq);
4304                 if (bottle_bw && on_queue) {
4305                         /* a rwnd report is in here */
4306                         if (bottle_bw > on_queue)
4307                                 a_rwnd = bottle_bw - on_queue;
4308                         else
4309                                 a_rwnd = 0;
4310
4311                         if (a_rwnd == 0)
4312                                 stcb->asoc.peers_rwnd = 0;
4313                         else {
4314                                 if (a_rwnd > stcb->asoc.total_flight) {
4315                                         stcb->asoc.peers_rwnd =
4316                                             a_rwnd - stcb->asoc.total_flight;
4317                                 } else {
4318                                         stcb->asoc.peers_rwnd = 0;
4319                                 }
4320                                 if (stcb->asoc.peers_rwnd <
4321                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4322                                         /* SWS sender side engages */
4323                                         stcb->asoc.peers_rwnd = 0;
4324                                 }
4325                         }
4326                 }
4327         } else {
4328                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4329         }
4330
4331         /* now middle boxes in sat networks get a cwnd bump */
4332         if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) &&
4333             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4334             (stcb->asoc.sat_network)) {
4335                 /*
4336                  * This is debatable but for sat networks it makes sense
4337                  * Note if a T3 timer has went off, we will prohibit any
4338                  * changes to cwnd until we exit the t3 loss recovery.
4339                  */
4340                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4341                     net, cp, &bottle_bw, &on_queue);
4342         }
4343 }
4344
4345 /*
4346  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4347  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4348  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4349  * length of the complete packet outputs: - length: modified to remaining
4350  * length after control processing - netp: modified to new sctp_nets after
4351  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4352  * bad packet,...) otherwise return the tcb for this packet
4353  */
4354 #ifdef __GNUC__
4355 __attribute__((noinline))
4356 #endif
4357 static struct sctp_tcb *
4358 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4359     struct sockaddr *src, struct sockaddr *dst,
4360     struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4361     struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4362     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
4363     uint32_t vrf_id, uint16_t port)
4364 {
4365         struct sctp_association *asoc;
4366         struct mbuf *op_err;
4367         char msg[SCTP_DIAG_INFO_LEN];
4368         uint32_t vtag_in;
4369         int num_chunks = 0;     /* number of control chunks processed */
4370         uint32_t chk_length, contiguous;
4371         int ret;
4372         int abort_no_unlock = 0;
4373         int ecne_seen = 0;
4374
4375         /*
4376          * How big should this be, and should it be alloc'd? Lets try the
4377          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4378          * until we get into jumbo grams and such..
4379          */
4380         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4381         int got_auth = 0;
4382         uint32_t auth_offset = 0, auth_len = 0;
4383         int auth_skipped = 0;
4384         int asconf_cnt = 0;
4385
4386         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4387             iphlen, *offset, length, (void *)stcb);
4388
4389         if (stcb) {
4390                 SCTP_TCB_LOCK_ASSERT(stcb);
4391         }
4392         /* validate chunk header length... */
4393         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4394                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4395                     ntohs(ch->chunk_length));
4396                 *offset = length;
4397                 return (stcb);
4398         }
4399         /*
4400          * validate the verification tag
4401          */
4402         vtag_in = ntohl(sh->v_tag);
4403
4404         if (ch->chunk_type == SCTP_INITIATION) {
4405                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4406                     ntohs(ch->chunk_length), vtag_in);
4407                 if (vtag_in != 0) {
4408                         /* protocol error- silently discard... */
4409                         SCTP_STAT_INCR(sctps_badvtag);
4410                         if (stcb != NULL) {
4411                                 SCTP_TCB_UNLOCK(stcb);
4412                         }
4413                         return (NULL);
4414                 }
4415         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4416                 /*
4417                  * If there is no stcb, skip the AUTH chunk and process
4418                  * later after a stcb is found (to validate the lookup was
4419                  * valid.
4420                  */
4421                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4422                     (stcb == NULL) &&
4423                     (inp->auth_supported == 1)) {
4424                         /* save this chunk for later processing */
4425                         auth_skipped = 1;
4426                         auth_offset = *offset;
4427                         auth_len = ntohs(ch->chunk_length);
4428
4429                         /* (temporarily) move past this chunk */
4430                         *offset += SCTP_SIZE32(auth_len);
4431                         if (*offset >= length) {
4432                                 /* no more data left in the mbuf chain */
4433                                 *offset = length;
4434                                 return (NULL);
4435                         }
4436                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4437                             sizeof(struct sctp_chunkhdr), chunk_buf);
4438                 }
4439                 if (ch == NULL) {
4440                         /* Help */
4441                         *offset = length;
4442                         return (stcb);
4443                 }
4444                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4445                         goto process_control_chunks;
4446                 }
4447                 /*
4448                  * first check if it's an ASCONF with an unknown src addr we
4449                  * need to look inside to find the association
4450                  */
4451                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4452                         struct sctp_chunkhdr *asconf_ch = ch;
4453                         uint32_t asconf_offset = 0, asconf_len = 0;
4454
4455                         /* inp's refcount may be reduced */
4456                         SCTP_INP_INCR_REF(inp);
4457
4458                         asconf_offset = *offset;
4459                         do {
4460                                 asconf_len = ntohs(asconf_ch->chunk_length);
4461                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4462                                         break;
4463                                 stcb = sctp_findassociation_ep_asconf(m,
4464                                     *offset,
4465                                     dst,
4466                                     sh, &inp, netp, vrf_id);
4467                                 if (stcb != NULL)
4468                                         break;
4469                                 asconf_offset += SCTP_SIZE32(asconf_len);
4470                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4471                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4472                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4473                         if (stcb == NULL) {
4474                                 /*
4475                                  * reduce inp's refcount if not reduced in
4476                                  * sctp_findassociation_ep_asconf().
4477                                  */
4478                                 SCTP_INP_DECR_REF(inp);
4479                         }
4480
4481                         /* now go back and verify any auth chunk to be sure */
4482                         if (auth_skipped && (stcb != NULL)) {
4483                                 struct sctp_auth_chunk *auth;
4484
4485                                 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) {
4486                                         auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, chunk_buf);
4487                                         got_auth = 1;
4488                                         auth_skipped = 0;
4489                                 } else {
4490                                         auth = NULL;
4491                                 }
4492                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4493                                     auth_offset)) {
4494                                         /* auth HMAC failed so dump it */
4495                                         *offset = length;
4496                                         return (stcb);
4497                                 } else {
4498                                         /* remaining chunks are HMAC checked */
4499                                         stcb->asoc.authenticated = 1;
4500                                 }
4501                         }
4502                 }
4503                 if (stcb == NULL) {
4504                         SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4505                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4506                             msg);
4507                         /* no association, so it's out of the blue... */
4508                         sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
4509                             mflowtype, mflowid, inp->fibnum,
4510                             vrf_id, port);
4511                         *offset = length;
4512                         return (NULL);
4513                 }
4514                 asoc = &stcb->asoc;
4515                 /* ABORT and SHUTDOWN can use either v_tag... */
4516                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4517                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4518                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4519                         /* Take the T-bit always into account. */
4520                         if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
4521                             (vtag_in == asoc->my_vtag)) ||
4522                             (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
4523                             (asoc->peer_vtag != htonl(0)) &&
4524                             (vtag_in == asoc->peer_vtag))) {
4525                                 /* this is valid */
4526                         } else {
4527                                 /* drop this packet... */
4528                                 SCTP_STAT_INCR(sctps_badvtag);
4529                                 if (stcb != NULL) {
4530                                         SCTP_TCB_UNLOCK(stcb);
4531                                 }
4532                                 return (NULL);
4533                         }
4534                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4535                         if (vtag_in != asoc->my_vtag) {
4536                                 /*
4537                                  * this could be a stale SHUTDOWN-ACK or the
4538                                  * peer never got the SHUTDOWN-COMPLETE and
4539                                  * is still hung; we have started a new asoc
4540                                  * but it won't complete until the shutdown
4541                                  * is completed
4542                                  */
4543                                 if (stcb != NULL) {
4544                                         SCTP_TCB_UNLOCK(stcb);
4545                                 }
4546                                 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4547                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4548                                     msg);
4549                                 sctp_handle_ootb(m, iphlen, *offset, src, dst,
4550                                     sh, inp, op_err,
4551                                     mflowtype, mflowid, fibnum,
4552                                     vrf_id, port);
4553                                 return (NULL);
4554                         }
4555                 } else {
4556                         /* for all other chunks, vtag must match */
4557                         if (vtag_in != asoc->my_vtag) {
4558                                 /* invalid vtag... */
4559                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4560                                     "invalid vtag: %xh, expect %xh\n",
4561                                     vtag_in, asoc->my_vtag);
4562                                 SCTP_STAT_INCR(sctps_badvtag);
4563                                 if (stcb != NULL) {
4564                                         SCTP_TCB_UNLOCK(stcb);
4565                                 }
4566                                 *offset = length;
4567                                 return (NULL);
4568                         }
4569                 }
4570         }                       /* end if !SCTP_COOKIE_ECHO */
4571         /*
4572          * process all control chunks...
4573          */
4574         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4575             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4576             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4577             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
4578                 /* implied cookie-ack.. we must have lost the ack */
4579                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4580                     *netp);
4581         }
4582
4583 process_control_chunks:
4584         while (IS_SCTP_CONTROL(ch)) {
4585                 /* validate chunk length */
4586                 chk_length = ntohs(ch->chunk_length);
4587                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4588                     ch->chunk_type, chk_length);
4589                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4590                 if (chk_length < sizeof(*ch) ||
4591                     (*offset + (int)chk_length) > length) {
4592                         *offset = length;
4593                         return (stcb);
4594                 }
4595                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4596                 /*
4597                  * INIT and INIT-ACK only gets the init ack "header" portion
4598                  * only because we don't have to process the peer's COOKIE.
4599                  * All others get a complete chunk.
4600                  */
4601                 switch (ch->chunk_type) {
4602                 case SCTP_INITIATION:
4603                         contiguous = sizeof(struct sctp_init_chunk);
4604                         break;
4605                 case SCTP_INITIATION_ACK:
4606                         contiguous = sizeof(struct sctp_init_ack_chunk);
4607                         break;
4608                 default:
4609                         contiguous = min(chk_length, sizeof(chunk_buf));
4610                         break;
4611                 }
4612                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4613                     contiguous,
4614                     chunk_buf);
4615                 if (ch == NULL) {
4616                         *offset = length;
4617                         if (stcb != NULL) {
4618                                 SCTP_TCB_UNLOCK(stcb);
4619                         }
4620                         return (NULL);
4621                 }
4622
4623                 num_chunks++;
4624                 /* Save off the last place we got a control from */
4625                 if (stcb != NULL) {
4626                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4627                                 /*
4628                                  * allow last_control to be NULL if
4629                                  * ASCONF... ASCONF processing will find the
4630                                  * right net later
4631                                  */
4632                                 if ((netp != NULL) && (*netp != NULL))
4633                                         stcb->asoc.last_control_chunk_from = *netp;
4634                         }
4635                 }
4636 #ifdef SCTP_AUDITING_ENABLED
4637                 sctp_audit_log(0xB0, ch->chunk_type);
4638 #endif
4639
4640                 /* check to see if this chunk required auth, but isn't */
4641                 if ((stcb != NULL) &&
4642                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4643                     !stcb->asoc.authenticated) {
4644                         /* "silently" ignore */
4645                         SCTP_STAT_INCR(sctps_recvauthmissing);
4646                         goto next_chunk;
4647                 }
4648                 switch (ch->chunk_type) {
4649                 case SCTP_INITIATION:
4650                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4651                         /* The INIT chunk must be the only chunk. */
4652                         if ((num_chunks > 1) ||
4653                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4654                                 /* RFC 4960 requires that no ABORT is sent */
4655                                 *offset = length;
4656                                 if (stcb != NULL) {
4657                                         SCTP_TCB_UNLOCK(stcb);
4658                                 }
4659                                 return (NULL);
4660                         }
4661                         /* Honor our resource limit. */
4662                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4663                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4664                                 sctp_abort_association(inp, stcb, m, iphlen,
4665                                     src, dst, sh, op_err,
4666                                     mflowtype, mflowid,
4667                                     vrf_id, port);
4668                                 *offset = length;
4669                                 return (NULL);
4670                         }
4671                         sctp_handle_init(m, iphlen, *offset, src, dst, sh,
4672                             (struct sctp_init_chunk *)ch, inp,
4673                             stcb, *netp, &abort_no_unlock,
4674                             mflowtype, mflowid,
4675                             vrf_id, port);
4676                         *offset = length;
4677                         if ((!abort_no_unlock) && (stcb != NULL)) {
4678                                 SCTP_TCB_UNLOCK(stcb);
4679                         }
4680                         return (NULL);
4681                         break;
4682                 case SCTP_PAD_CHUNK:
4683                         break;
4684                 case SCTP_INITIATION_ACK:
4685                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n");
4686                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4687                                 /* We are not interested anymore */
4688                                 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) {
4689                                         ;
4690                                 } else {
4691                                         *offset = length;
4692                                         if (stcb != NULL) {
4693                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
4694                                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
4695                                         }
4696                                         return (NULL);
4697                                 }
4698                         }
4699                         /* The INIT-ACK chunk must be the only chunk. */
4700                         if ((num_chunks > 1) ||
4701                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4702                                 *offset = length;
4703                                 return (stcb);
4704                         }
4705                         if ((netp != NULL) && (*netp != NULL)) {
4706                                 ret = sctp_handle_init_ack(m, iphlen, *offset,
4707                                     src, dst, sh,
4708                                     (struct sctp_init_ack_chunk *)ch,
4709                                     stcb, *netp,
4710                                     &abort_no_unlock,
4711                                     mflowtype, mflowid,
4712                                     vrf_id);
4713                         } else {
4714                                 ret = -1;
4715                         }
4716                         *offset = length;
4717                         if (abort_no_unlock) {
4718                                 return (NULL);
4719                         }
4720                         /*
4721                          * Special case, I must call the output routine to
4722                          * get the cookie echoed
4723                          */
4724                         if ((stcb != NULL) && (ret == 0)) {
4725                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4726                         }
4727                         return (stcb);
4728                         break;
4729                 case SCTP_SELECTIVE_ACK:
4730                 case SCTP_NR_SELECTIVE_ACK:
4731                         {
4732                                 int abort_now = 0;
4733                                 uint32_t a_rwnd, cum_ack;
4734                                 uint16_t num_seg, num_nr_seg, num_dup;
4735                                 uint8_t flags;
4736                                 int offset_seg, offset_dup;
4737
4738                                 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n",
4739                                     ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK");
4740                                 SCTP_STAT_INCR(sctps_recvsacks);
4741                                 if (stcb == NULL) {
4742                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n",
4743                                             (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK");
4744                                         break;
4745                                 }
4746                                 if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
4747                                         if (chk_length < sizeof(struct sctp_sack_chunk)) {
4748                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4749                                                 break;
4750                                         }
4751                                 } else {
4752                                         if (stcb->asoc.nrsack_supported == 0) {
4753                                                 goto unknown_chunk;
4754                                         }
4755                                         if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
4756                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n");
4757                                                 break;
4758                                         }
4759                                 }
4760                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4761                                         /*-
4762                                          * If we have sent a shutdown-ack, we will pay no
4763                                          * attention to a sack sent in to us since
4764                                          * we don't care anymore.
4765                                          */
4766                                         break;
4767                                 }
4768                                 flags = ch->chunk_flags;
4769                                 if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
4770                                         struct sctp_sack_chunk *sack;
4771
4772                                         sack = (struct sctp_sack_chunk *)ch;
4773                                         cum_ack = ntohl(sack->sack.cum_tsn_ack);
4774                                         num_seg = ntohs(sack->sack.num_gap_ack_blks);
4775                                         num_nr_seg = 0;
4776                                         num_dup = ntohs(sack->sack.num_dup_tsns);
4777                                         a_rwnd = ntohl(sack->sack.a_rwnd);
4778                                         if (sizeof(struct sctp_sack_chunk) +
4779                                             num_seg * sizeof(struct sctp_gap_ack_block) +
4780                                             num_dup * sizeof(uint32_t) != chk_length) {
4781                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4782                                                 break;
4783                                         }
4784                                         offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4785                                         offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4786                                 } else {
4787                                         struct sctp_nr_sack_chunk *nr_sack;
4788
4789                                         nr_sack = (struct sctp_nr_sack_chunk *)ch;
4790                                         cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
4791                                         num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
4792                                         num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
4793                                         num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
4794                                         a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd);
4795                                         if (sizeof(struct sctp_nr_sack_chunk) +
4796                                             (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
4797                                             num_dup * sizeof(uint32_t) != chk_length) {
4798                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
4799                                                 break;
4800                                         }
4801                                         offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
4802                                         offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block);
4803                                 }
4804                                 SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4805                                     (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK",
4806                                     cum_ack, num_seg, a_rwnd);
4807                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4808                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4809                                     (num_seg == 0) && (num_nr_seg == 0) &&
4810                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4811                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4812                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4813                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
4814                                         /*
4815                                          * We have a SIMPLE sack having no
4816                                          * prior segments and data on sent
4817                                          * queue to be acked. Use the faster
4818                                          * path sack processing. We also
4819                                          * allow window update sacks with no
4820                                          * missing segments to go this way
4821                                          * too.
4822                                          */
4823                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
4824                                             &abort_now, ecne_seen);
4825                                 } else {
4826                                         if ((netp != NULL) && (*netp != NULL)) {
4827                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4828                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
4829                                                     cum_ack, a_rwnd, ecne_seen);
4830                                         }
4831                                 }
4832                                 if (abort_now) {
4833                                         /* ABORT signal from sack processing */
4834                                         *offset = length;
4835                                         return (NULL);
4836                                 }
4837                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4838                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4839                                     (stcb->asoc.stream_queue_cnt == 0)) {
4840                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4841                                 }
4842                                 break;
4843                         }
4844                 case SCTP_HEARTBEAT_REQUEST:
4845                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
4846                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
4847                                 SCTP_STAT_INCR(sctps_recvheartbeat);
4848                                 sctp_send_heartbeat_ack(stcb, m, *offset,
4849                                     chk_length, *netp);
4850                         }
4851                         break;
4852                 case SCTP_HEARTBEAT_ACK:
4853                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n");
4854                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
4855                                 /* Its not ours */
4856                                 *offset = length;
4857                                 return (stcb);
4858                         }
4859                         SCTP_STAT_INCR(sctps_recvheartbeatack);
4860                         if ((netp != NULL) && (*netp != NULL)) {
4861                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
4862                                     stcb, *netp);
4863                         }
4864                         break;
4865                 case SCTP_ABORT_ASSOCIATION:
4866                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
4867                             (void *)stcb);
4868                         *offset = length;
4869                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
4870                                 if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) {
4871                                         return (NULL);
4872                                 } else {
4873                                         return (stcb);
4874                                 }
4875                         } else {
4876                                 return (NULL);
4877                         }
4878                         break;
4879                 case SCTP_SHUTDOWN:
4880                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
4881                             (void *)stcb);
4882                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
4883                                 *offset = length;
4884                                 return (stcb);
4885                         }
4886                         if ((netp != NULL) && (*netp != NULL)) {
4887                                 int abort_flag = 0;
4888
4889                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
4890                                     stcb, *netp, &abort_flag);
4891                                 if (abort_flag) {
4892                                         *offset = length;
4893                                         return (NULL);
4894                                 }
4895                         }
4896                         break;
4897                 case SCTP_SHUTDOWN_ACK:
4898                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb);
4899                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
4900                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
4901                         }
4902                         *offset = length;
4903                         return (NULL);
4904                         break;
4905                 case SCTP_OPERATION_ERROR:
4906                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n");
4907                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) &&
4908                             sctp_handle_error(ch, stcb, *netp, contiguous) < 0) {
4909                                 *offset = length;
4910                                 return (NULL);
4911                         }
4912                         break;
4913                 case SCTP_COOKIE_ECHO:
4914                         SCTPDBG(SCTP_DEBUG_INPUT3,
4915                             "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb);
4916                         if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) {
4917                                 ;
4918                         } else {
4919                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4920                                         /* We are not interested anymore */
4921                         abend:
4922                                         if (stcb != NULL) {
4923                                                 SCTP_TCB_UNLOCK(stcb);
4924                                         }
4925                                         *offset = length;
4926                                         return (NULL);
4927                                 }
4928                         }
4929                         /*-
4930                          * First are we accepting? We do this again here
4931                          * since it is possible that a previous endpoint WAS
4932                          * listening responded to a INIT-ACK and then
4933                          * closed. We opened and bound.. and are now no
4934                          * longer listening.
4935                          *
4936                          * XXXGL: notes on checking listen queue length.
4937                          * 1) SCTP_IS_LISTENING() doesn't necessarily mean
4938                          *    SOLISTENING(), because a listening "UDP type"
4939                          *    socket isn't listening in terms of the socket
4940                          *    layer.  It is a normal data flow socket, that
4941                          *    can fork off new connections.  Thus, we should
4942                          *    look into sol_qlen only in case we are !UDP.
4943                          * 2) Checking sol_qlen in general requires locking
4944                          *    the socket, and this code lacks that.
4945                          */
4946                         if ((stcb == NULL) &&
4947                             (!SCTP_IS_LISTENING(inp) ||
4948                             (!(inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) &&
4949                             inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) {
4950                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
4951                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
4952                                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4953                                         sctp_abort_association(inp, stcb, m, iphlen,
4954                                             src, dst, sh, op_err,
4955                                             mflowtype, mflowid,
4956                                             vrf_id, port);
4957                                 }
4958                                 *offset = length;
4959                                 return (NULL);
4960                         } else {
4961                                 struct mbuf *ret_buf;
4962                                 struct sctp_inpcb *linp;
4963                                 struct sctp_tmit_chunk *chk;
4964
4965                                 if (stcb) {
4966                                         linp = NULL;
4967                                 } else {
4968                                         linp = inp;
4969                                 }
4970
4971                                 if (linp != NULL) {
4972                                         SCTP_ASOC_CREATE_LOCK(linp);
4973                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
4974                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
4975                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
4976                                                 goto abend;
4977                                         }
4978                                 }
4979
4980                                 if (netp != NULL) {
4981                                         struct sctp_tcb *locked_stcb;
4982
4983                                         locked_stcb = stcb;
4984                                         ret_buf =
4985                                             sctp_handle_cookie_echo(m, iphlen,
4986                                             *offset,
4987                                             src, dst,
4988                                             sh,
4989                                             (struct sctp_cookie_echo_chunk *)ch,
4990                                             &inp, &stcb, netp,
4991                                             auth_skipped,
4992                                             auth_offset,
4993                                             auth_len,
4994                                             &locked_stcb,
4995                                             mflowtype,
4996                                             mflowid,
4997                                             vrf_id,
4998                                             port);
4999                                         if ((locked_stcb != NULL) && (locked_stcb != stcb)) {
5000                                                 SCTP_TCB_UNLOCK(locked_stcb);
5001                                         }
5002                                         if (stcb != NULL) {
5003                                                 SCTP_TCB_LOCK_ASSERT(stcb);
5004                                         }
5005                                 } else {
5006                                         ret_buf = NULL;
5007                                 }
5008                                 if (linp != NULL) {
5009                                         SCTP_ASOC_CREATE_UNLOCK(linp);
5010                                 }
5011                                 if (ret_buf == NULL) {
5012                                         if (stcb != NULL) {
5013                                                 SCTP_TCB_UNLOCK(stcb);
5014                                         }
5015                                         SCTPDBG(SCTP_DEBUG_INPUT3,
5016                                             "GAK, null buffer\n");
5017                                         *offset = length;
5018                                         return (NULL);
5019                                 }
5020                                 /* if AUTH skipped, see if it verified... */
5021                                 if (auth_skipped) {
5022                                         got_auth = 1;
5023                                         auth_skipped = 0;
5024                                 }
5025                                 /* Restart the timer if we have pending data */
5026                                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
5027                                         if (chk->whoTo != NULL) {
5028                                                 break;
5029                                         }
5030                                 }
5031                                 if (chk != NULL) {
5032                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
5033                                 }
5034                         }
5035                         break;
5036                 case SCTP_COOKIE_ACK:
5037                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb);
5038                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5039                                 return (stcb);
5040                         }
5041                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5042                                 /* We are not interested anymore */
5043                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5044                                         ;
5045                                 } else if (stcb) {
5046                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5047                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
5048                                         *offset = length;
5049                                         return (NULL);
5050                                 }
5051                         }
5052                         if ((netp != NULL) && (*netp != NULL)) {
5053                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
5054                         }
5055                         break;
5056                 case SCTP_ECN_ECHO:
5057                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n");
5058                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5059                                 /* Its not ours */
5060                                 *offset = length;
5061                                 return (stcb);
5062                         }
5063                         if (stcb->asoc.ecn_supported == 0) {
5064                                 goto unknown_chunk;
5065                         }
5066                         sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb);
5067                         ecne_seen = 1;
5068                         break;
5069                 case SCTP_ECN_CWR:
5070                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n");
5071                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5072                                 *offset = length;
5073                                 return (stcb);
5074                         }
5075                         if (stcb->asoc.ecn_supported == 0) {
5076                                 goto unknown_chunk;
5077                         }
5078                         sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5079                         break;
5080                 case SCTP_SHUTDOWN_COMPLETE:
5081                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb);
5082                         /* must be first and only chunk */
5083                         if ((num_chunks > 1) ||
5084                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5085                                 *offset = length;
5086                                 return (stcb);
5087                         }
5088                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5089                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5090                                     stcb, *netp);
5091                         }
5092                         *offset = length;
5093                         return (NULL);
5094                         break;
5095                 case SCTP_ASCONF:
5096                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5097                         if (stcb != NULL) {
5098                                 if (stcb->asoc.asconf_supported == 0) {
5099                                         goto unknown_chunk;
5100                                 }
5101                                 sctp_handle_asconf(m, *offset, src,
5102                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5103                                 asconf_cnt++;
5104                         }
5105                         break;
5106                 case SCTP_ASCONF_ACK:
5107                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n");
5108                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5109                                 /* Its not ours */
5110                                 *offset = length;
5111                                 return (stcb);
5112                         }
5113                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5114                                 if (stcb->asoc.asconf_supported == 0) {
5115                                         goto unknown_chunk;
5116                                 }
5117                                 /* He's alive so give him credit */
5118                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5119                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5120                                             stcb->asoc.overall_error_count,
5121                                             0,
5122                                             SCTP_FROM_SCTP_INPUT,
5123                                             __LINE__);
5124                                 }
5125                                 stcb->asoc.overall_error_count = 0;
5126                                 sctp_handle_asconf_ack(m, *offset,
5127                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5128                                 if (abort_no_unlock)
5129                                         return (NULL);
5130                         }
5131                         break;
5132                 case SCTP_FORWARD_CUM_TSN:
5133                 case SCTP_IFORWARD_CUM_TSN:
5134                         SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n",
5135                             ch->chunk_type == SCTP_FORWARD_CUM_TSN ? "FORWARD_TSN" : "I_FORWARD_TSN");
5136                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5137                                 /* Its not ours */
5138                                 *offset = length;
5139                                 return (stcb);
5140                         }
5141
5142                         if (stcb != NULL) {
5143                                 int abort_flag = 0;
5144
5145                                 if (stcb->asoc.prsctp_supported == 0) {
5146                                         goto unknown_chunk;
5147                                 }
5148                                 if (((stcb->asoc.idata_supported == 1) && (ch->chunk_type == SCTP_FORWARD_CUM_TSN)) ||
5149                                     ((stcb->asoc.idata_supported == 0) && (ch->chunk_type == SCTP_IFORWARD_CUM_TSN))) {
5150                                         if (ch->chunk_type == SCTP_FORWARD_CUM_TSN) {
5151                                                 SCTP_SNPRINTF(msg, sizeof(msg), "%s", "FORWARD-TSN chunk received when I-FORWARD-TSN was negotiated");
5152                                         } else {
5153                                                 SCTP_SNPRINTF(msg, sizeof(msg), "%s", "I-FORWARD-TSN chunk received when FORWARD-TSN was negotiated");
5154                                         }
5155                                         op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
5156                                         sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
5157                                         *offset = length;
5158                                         return (NULL);
5159                                 }
5160                                 *fwd_tsn_seen = 1;
5161                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5162                                         /* We are not interested anymore */
5163                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5164                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_31);
5165                                         *offset = length;
5166                                         return (NULL);
5167                                 }
5168                                 /*
5169                                  * For sending a SACK this looks like DATA
5170                                  * chunks.
5171                                  */
5172                                 stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from;
5173                                 sctp_handle_forward_tsn(stcb,
5174                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5175                                 if (abort_flag) {
5176                                         *offset = length;
5177                                         return (NULL);
5178                                 }
5179                         }
5180                         break;
5181                 case SCTP_STREAM_RESET:
5182                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5183                         if ((stcb == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req))) {
5184                                 /* Its not ours */
5185                                 *offset = length;
5186                                 return (stcb);
5187                         }
5188                         if (stcb->asoc.reconfig_supported == 0) {
5189                                 goto unknown_chunk;
5190                         }
5191                         if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5192                                 /* stop processing */
5193                                 *offset = length;
5194                                 return (NULL);
5195                         }
5196                         break;
5197                 case SCTP_PACKET_DROPPED:
5198                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5199                         /* re-get it all please */
5200                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5201                                 /* Its not ours */
5202                                 *offset = length;
5203                                 return (stcb);
5204                         }
5205
5206                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5207                                 if (stcb->asoc.pktdrop_supported == 0) {
5208                                         goto unknown_chunk;
5209                                 }
5210                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5211                                     stcb, *netp,
5212                                     min(chk_length, contiguous));
5213                         }
5214                         break;
5215                 case SCTP_AUTHENTICATION:
5216                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5217                         if (stcb == NULL) {
5218                                 /* save the first AUTH for later processing */
5219                                 if (auth_skipped == 0) {
5220                                         auth_offset = *offset;
5221                                         auth_len = chk_length;
5222                                         auth_skipped = 1;
5223                                 }
5224                                 /* skip this chunk (temporarily) */
5225                                 goto next_chunk;
5226                         }
5227                         if (stcb->asoc.auth_supported == 0) {
5228                                 goto unknown_chunk;
5229                         }
5230                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5231                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5232                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5233                                 /* Its not ours */
5234                                 *offset = length;
5235                                 return (stcb);
5236                         }
5237                         if (got_auth == 1) {
5238                                 /* skip this chunk... it's already auth'd */
5239                                 goto next_chunk;
5240                         }
5241                         got_auth = 1;
5242                         if (sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, m, *offset)) {
5243                                 /* auth HMAC failed so dump the packet */
5244                                 *offset = length;
5245                                 return (stcb);
5246                         } else {
5247                                 /* remaining chunks are HMAC checked */
5248                                 stcb->asoc.authenticated = 1;
5249                         }
5250                         break;
5251
5252                 default:
5253         unknown_chunk:
5254                         /* it's an unknown chunk! */
5255                         if ((ch->chunk_type & 0x40) &&
5256                             (stcb != NULL) &&
5257                             (SCTP_GET_STATE(stcb) != SCTP_STATE_EMPTY) &&
5258                             (SCTP_GET_STATE(stcb) != SCTP_STATE_INUSE) &&
5259                             (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) {
5260                                 struct sctp_gen_error_cause *cause;
5261                                 int len;
5262
5263                                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause),
5264                                     0, M_NOWAIT, 1, MT_DATA);
5265                                 if (op_err != NULL) {
5266                                         len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset));
5267                                         cause = mtod(op_err, struct sctp_gen_error_cause *);
5268                                         cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5269                                         cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause)));
5270                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5271                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
5272                                         if (SCTP_BUF_NEXT(op_err) != NULL) {
5273 #ifdef SCTP_MBUF_LOGGING
5274                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5275                                                         sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY);
5276                                                 }
5277 #endif
5278                                                 sctp_queue_op_err(stcb, op_err);
5279                                         } else {
5280                                                 sctp_m_freem(op_err);
5281                                         }
5282                                 }
5283                         }
5284                         if ((ch->chunk_type & 0x80) == 0) {
5285                                 /* discard this packet */
5286                                 *offset = length;
5287                                 return (stcb);
5288                         }       /* else skip this bad chunk and continue... */
5289                         break;
5290                 }               /* switch (ch->chunk_type) */
5291
5292 next_chunk:
5293                 /* get the next chunk */
5294                 *offset += SCTP_SIZE32(chk_length);
5295                 if (*offset >= length) {
5296                         /* no more data left in the mbuf chain */
5297                         break;
5298                 }
5299                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5300                     sizeof(struct sctp_chunkhdr), chunk_buf);
5301                 if (ch == NULL) {
5302                         *offset = length;
5303                         return (stcb);
5304                 }
5305         }                       /* while */
5306
5307         if ((asconf_cnt > 0) && (stcb != NULL)) {
5308                 sctp_send_asconf_ack(stcb);
5309         }
5310         return (stcb);
5311 }
5312
5313 /*
5314  * common input chunk processing (v4 and v6)
5315  */
5316 void
5317 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5318     struct sockaddr *src, struct sockaddr *dst,
5319     struct sctphdr *sh, struct sctp_chunkhdr *ch,
5320     uint8_t compute_crc,
5321     uint8_t ecn_bits,
5322     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
5323     uint32_t vrf_id, uint16_t port)
5324 {
5325         uint32_t high_tsn;
5326         int fwd_tsn_seen = 0, data_processed = 0;
5327         struct mbuf *m = *mm, *op_err;
5328         char msg[SCTP_DIAG_INFO_LEN];
5329         int un_sent;
5330         int cnt_ctrl_ready = 0;
5331         struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5332         struct sctp_tcb *stcb = NULL;
5333         struct sctp_nets *net = NULL;
5334
5335         SCTP_STAT_INCR(sctps_recvdatagrams);
5336 #ifdef SCTP_AUDITING_ENABLED
5337         sctp_audit_log(0xE0, 1);
5338         sctp_auditing(0, inp, stcb, net);
5339 #endif
5340         if (compute_crc != 0) {
5341                 uint32_t check, calc_check;
5342
5343                 check = sh->checksum;
5344                 sh->checksum = 0;
5345                 calc_check = sctp_calculate_cksum(m, iphlen);
5346                 sh->checksum = check;
5347                 if (calc_check != check) {
5348                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5349                             calc_check, check, (void *)m, length, iphlen);
5350                         stcb = sctp_findassociation_addr(m, offset, src, dst,
5351                             sh, ch, &inp, &net, vrf_id);
5352 #if defined(INET) || defined(INET6)
5353                         if ((ch->chunk_type != SCTP_INITIATION) &&
5354                             (net != NULL) && (net->port != port)) {
5355                                 if (net->port == 0) {
5356                                         /* UDP encapsulation turned on. */
5357                                         net->mtu -= sizeof(struct udphdr);
5358                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5359                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5360                                         }
5361                                 } else if (port == 0) {
5362                                         /* UDP encapsulation turned off. */
5363                                         net->mtu += sizeof(struct udphdr);
5364                                         /* XXX Update smallest_mtu */
5365                                 }
5366                                 net->port = port;
5367                         }
5368 #endif
5369                         if (net != NULL) {
5370                                 net->flowtype = mflowtype;
5371                                 net->flowid = mflowid;
5372                         }
5373                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5374                         if ((inp != NULL) && (stcb != NULL)) {
5375                                 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5376                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5377                         } else if ((inp != NULL) && (stcb == NULL)) {
5378                                 inp_decr = inp;
5379                         }
5380                         SCTP_STAT_INCR(sctps_badsum);
5381                         SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5382                         goto out;
5383                 }
5384         }
5385         /* Destination port of 0 is illegal, based on RFC4960. */
5386         if (sh->dest_port == 0) {
5387                 SCTP_STAT_INCR(sctps_hdrops);
5388                 goto out;
5389         }
5390         stcb = sctp_findassociation_addr(m, offset, src, dst,
5391             sh, ch, &inp, &net, vrf_id);
5392 #if defined(INET) || defined(INET6)
5393         if ((ch->chunk_type != SCTP_INITIATION) &&
5394             (net != NULL) && (net->port != port)) {
5395                 if (net->port == 0) {
5396                         /* UDP encapsulation turned on. */
5397                         net->mtu -= sizeof(struct udphdr);
5398                         if (stcb->asoc.smallest_mtu > net->mtu) {
5399                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5400                         }
5401                 } else if (port == 0) {
5402                         /* UDP encapsulation turned off. */
5403                         net->mtu += sizeof(struct udphdr);
5404                         /* XXX Update smallest_mtu */
5405                 }
5406                 net->port = port;
5407         }
5408 #endif
5409         if (net != NULL) {
5410                 net->flowtype = mflowtype;
5411                 net->flowid = mflowid;
5412         }
5413         if (inp == NULL) {
5414                 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5415                 SCTP_STAT_INCR(sctps_noport);
5416                 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5417                         goto out;
5418                 }
5419                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5420                         sctp_send_shutdown_complete2(src, dst, sh,
5421                             mflowtype, mflowid, fibnum,
5422                             vrf_id, port);
5423                         goto out;
5424                 }
5425                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5426                         goto out;
5427                 }
5428                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5429                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5430                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5431                             (ch->chunk_type != SCTP_INIT))) {
5432                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5433                                     "Out of the blue");
5434                                 sctp_send_abort(m, iphlen, src, dst,
5435                                     sh, 0, op_err,
5436                                     mflowtype, mflowid, fibnum,
5437                                     vrf_id, port);
5438                         }
5439                 }
5440                 goto out;
5441         } else if (stcb == NULL) {
5442                 inp_decr = inp;
5443         }
5444         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5445             (void *)m, iphlen, offset, length, (void *)stcb);
5446         if (stcb) {
5447                 /* always clear this before beginning a packet */
5448                 stcb->asoc.authenticated = 0;
5449                 stcb->asoc.seen_a_sack_this_pkt = 0;
5450                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5451                     (void *)stcb, stcb->asoc.state);
5452
5453                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5454                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5455                         /*-
5456                          * If we hit here, we had a ref count
5457                          * up when the assoc was aborted and the
5458                          * timer is clearing out the assoc, we should
5459                          * NOT respond to any packet.. its OOTB.
5460                          */
5461                         SCTP_TCB_UNLOCK(stcb);
5462                         stcb = NULL;
5463                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5464                         SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5465                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5466                             msg);
5467                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5468                             mflowtype, mflowid, inp->fibnum,
5469                             vrf_id, port);
5470                         goto out;
5471                 }
5472         }
5473         if (IS_SCTP_CONTROL(ch)) {
5474                 /* process the control portion of the SCTP packet */
5475                 /* sa_ignore NO_NULL_CHK */
5476                 stcb = sctp_process_control(m, iphlen, &offset, length,
5477                     src, dst, sh, ch,
5478                     inp, stcb, &net, &fwd_tsn_seen,
5479                     mflowtype, mflowid, fibnum,
5480                     vrf_id, port);
5481                 if (stcb) {
5482                         /*
5483                          * This covers us if the cookie-echo was there and
5484                          * it changes our INP.
5485                          */
5486                         inp = stcb->sctp_ep;
5487 #if defined(INET) || defined(INET6)
5488                         if ((ch->chunk_type != SCTP_INITIATION) &&
5489                             (net != NULL) && (net->port != port)) {
5490                                 if (net->port == 0) {
5491                                         /* UDP encapsulation turned on. */
5492                                         net->mtu -= sizeof(struct udphdr);
5493                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5494                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5495                                         }
5496                                 } else if (port == 0) {
5497                                         /* UDP encapsulation turned off. */
5498                                         net->mtu += sizeof(struct udphdr);
5499                                         /* XXX Update smallest_mtu */
5500                                 }
5501                                 net->port = port;
5502                         }
5503 #endif
5504                 }
5505         } else {
5506                 /*
5507                  * no control chunks, so pre-process DATA chunks (these
5508                  * checks are taken care of by control processing)
5509                  */
5510
5511                 /*
5512                  * if DATA only packet, and auth is required, then punt...
5513                  * can't have authenticated without any AUTH (control)
5514                  * chunks
5515                  */
5516                 if ((stcb != NULL) &&
5517                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5518                         /* "silently" ignore */
5519                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5520                         SCTP_STAT_INCR(sctps_recvauthmissing);
5521                         goto out;
5522                 }
5523                 if (stcb == NULL) {
5524                         /* out of the blue DATA chunk */
5525                         SCTP_PROBE5(receive, NULL, NULL, m, NULL, sh);
5526                         SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5527                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5528                             msg);
5529                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5530                             mflowtype, mflowid, fibnum,
5531                             vrf_id, port);
5532                         goto out;
5533                 }
5534                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5535                         /* v_tag mismatch! */
5536                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5537                         SCTP_STAT_INCR(sctps_badvtag);
5538                         goto out;
5539                 }
5540         }
5541
5542         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5543         if (stcb == NULL) {
5544                 /*
5545                  * no valid TCB for this packet, or we found it's a bad
5546                  * packet while processing control, or we're done with this
5547                  * packet (done or skip rest of data), so we drop it...
5548                  */
5549                 goto out;
5550         }
5551
5552         /*
5553          * DATA chunk processing
5554          */
5555         /* plow through the data chunks while length > offset */
5556
5557         /*
5558          * Rest should be DATA only.  Check authentication state if AUTH for
5559          * DATA is required.
5560          */
5561         if ((length > offset) &&
5562             (stcb != NULL) &&
5563             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5564             !stcb->asoc.authenticated) {
5565                 /* "silently" ignore */
5566                 SCTP_STAT_INCR(sctps_recvauthmissing);
5567                 SCTPDBG(SCTP_DEBUG_AUTH1,
5568                     "Data chunk requires AUTH, skipped\n");
5569                 goto trigger_send;
5570         }
5571         if (length > offset) {
5572                 int retval;
5573
5574                 /*
5575                  * First check to make sure our state is correct. We would
5576                  * not get here unless we really did have a tag, so we don't
5577                  * abort if this happens, just dump the chunk silently.
5578                  */
5579                 switch (SCTP_GET_STATE(stcb)) {
5580                 case SCTP_STATE_COOKIE_ECHOED:
5581                         /*
5582                          * we consider data with valid tags in this state
5583                          * shows us the cookie-ack was lost. Imply it was
5584                          * there.
5585                          */
5586                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5587                         break;
5588                 case SCTP_STATE_COOKIE_WAIT:
5589                         /*
5590                          * We consider OOTB any data sent during asoc setup.
5591                          */
5592                         SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5593                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5594                             msg);
5595                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5596                             mflowtype, mflowid, inp->fibnum,
5597                             vrf_id, port);
5598                         goto out;
5599                         /* sa_ignore NOTREACHED */
5600                         break;
5601                 case SCTP_STATE_EMPTY:  /* should not happen */
5602                 case SCTP_STATE_INUSE:  /* should not happen */
5603                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5604                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5605                 default:
5606                         goto out;
5607                         /* sa_ignore NOTREACHED */
5608                         break;
5609                 case SCTP_STATE_OPEN:
5610                 case SCTP_STATE_SHUTDOWN_SENT:
5611                         break;
5612                 }
5613                 /* plow through the data chunks while length > offset */
5614                 retval = sctp_process_data(mm, iphlen, &offset, length,
5615                     inp, stcb, net, &high_tsn);
5616                 if (retval == 2) {
5617                         /*
5618                          * The association aborted, NO UNLOCK needed since
5619                          * the association is destroyed.
5620                          */
5621                         stcb = NULL;
5622                         goto out;
5623                 }
5624                 if (retval == 0) {
5625                         data_processed = 1;
5626                 }
5627                 /*
5628                  * Anything important needs to have been m_copy'ed in
5629                  * process_data
5630                  */
5631         }
5632
5633         /* take care of ecn */
5634         if ((data_processed == 1) &&
5635             (stcb->asoc.ecn_supported == 1) &&
5636             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5637                 /* Yep, we need to add a ECNE */
5638                 sctp_send_ecn_echo(stcb, net, high_tsn);
5639         }
5640
5641         if ((data_processed == 0) && (fwd_tsn_seen)) {
5642                 int was_a_gap;
5643                 uint32_t highest_tsn;
5644
5645                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
5646                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
5647                 } else {
5648                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
5649                 }
5650                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
5651                 stcb->asoc.send_sack = 1;
5652                 sctp_sack_check(stcb, was_a_gap);
5653         } else if (fwd_tsn_seen) {
5654                 stcb->asoc.send_sack = 1;
5655         }
5656         /* trigger send of any chunks in queue... */
5657 trigger_send:
5658 #ifdef SCTP_AUDITING_ENABLED
5659         sctp_audit_log(0xE0, 2);
5660         sctp_auditing(1, inp, stcb, net);
5661 #endif
5662         SCTPDBG(SCTP_DEBUG_INPUT1,
5663             "Check for chunk output prw:%d tqe:%d tf=%d\n",
5664             stcb->asoc.peers_rwnd,
5665             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
5666             stcb->asoc.total_flight);
5667         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
5668         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
5669                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
5670         }
5671         if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) ||
5672             cnt_ctrl_ready ||
5673             stcb->asoc.trigger_reset ||
5674             ((un_sent > 0) &&
5675             (stcb->asoc.peers_rwnd > 0 || stcb->asoc.total_flight == 0))) {
5676                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
5677                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5678                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
5679         }
5680 #ifdef SCTP_AUDITING_ENABLED
5681         sctp_audit_log(0xE0, 3);
5682         sctp_auditing(2, inp, stcb, net);
5683 #endif
5684 out:
5685         if (stcb != NULL) {
5686                 SCTP_TCB_UNLOCK(stcb);
5687         }
5688         if (inp_decr != NULL) {
5689                 /* reduce ref-count */
5690                 SCTP_INP_WLOCK(inp_decr);
5691                 SCTP_INP_DECR_REF(inp_decr);
5692                 SCTP_INP_WUNLOCK(inp_decr);
5693         }
5694         return;
5695 }
5696
5697 #ifdef INET
5698 void
5699 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
5700 {
5701         struct mbuf *m;
5702         int iphlen;
5703         uint32_t vrf_id = 0;
5704         uint8_t ecn_bits;
5705         struct sockaddr_in src, dst;
5706         struct ip *ip;
5707         struct sctphdr *sh;
5708         struct sctp_chunkhdr *ch;
5709         int length, offset;
5710         uint8_t compute_crc;
5711         uint32_t mflowid;
5712         uint8_t mflowtype;
5713         uint16_t fibnum;
5714
5715         iphlen = off;
5716         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
5717                 SCTP_RELEASE_PKT(i_pak);
5718                 return;
5719         }
5720         m = SCTP_HEADER_TO_CHAIN(i_pak);
5721 #ifdef SCTP_MBUF_LOGGING
5722         /* Log in any input mbufs */
5723         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5724                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
5725         }
5726 #endif
5727 #ifdef SCTP_PACKET_LOGGING
5728         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
5729                 sctp_packet_log(m);
5730         }
5731 #endif
5732         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
5733             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
5734             m->m_pkthdr.len,
5735             if_name(m->m_pkthdr.rcvif),
5736             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
5737         mflowid = m->m_pkthdr.flowid;
5738         mflowtype = M_HASHTYPE_GET(m);
5739         fibnum = M_GETFIB(m);
5740         SCTP_STAT_INCR(sctps_recvpackets);
5741         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
5742         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
5743         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5744         if (SCTP_BUF_LEN(m) < offset) {
5745                 if ((m = m_pullup(m, offset)) == NULL) {
5746                         SCTP_STAT_INCR(sctps_hdrops);
5747                         return;
5748                 }
5749         }
5750         ip = mtod(m, struct ip *);
5751         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
5752         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
5753         offset -= sizeof(struct sctp_chunkhdr);
5754         memset(&src, 0, sizeof(struct sockaddr_in));
5755         src.sin_family = AF_INET;
5756         src.sin_len = sizeof(struct sockaddr_in);
5757         src.sin_port = sh->src_port;
5758         src.sin_addr = ip->ip_src;
5759         memset(&dst, 0, sizeof(struct sockaddr_in));
5760         dst.sin_family = AF_INET;
5761         dst.sin_len = sizeof(struct sockaddr_in);
5762         dst.sin_port = sh->dest_port;
5763         dst.sin_addr = ip->ip_dst;
5764         length = ntohs(ip->ip_len);
5765         /* Validate mbuf chain length with IP payload length. */
5766         if (SCTP_HEADER_LEN(m) != length) {
5767                 SCTPDBG(SCTP_DEBUG_INPUT1,
5768                     "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
5769                 SCTP_STAT_INCR(sctps_hdrops);
5770                 goto out;
5771         }
5772         /* SCTP does not allow broadcasts or multicasts */
5773         if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
5774                 goto out;
5775         }
5776         if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
5777                 goto out;
5778         }
5779         ecn_bits = ip->ip_tos;
5780         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
5781                 SCTP_STAT_INCR(sctps_recvhwcrc);
5782                 compute_crc = 0;
5783         } else {
5784                 SCTP_STAT_INCR(sctps_recvswcrc);
5785                 compute_crc = 1;
5786         }
5787         sctp_common_input_processing(&m, iphlen, offset, length,
5788             (struct sockaddr *)&src,
5789             (struct sockaddr *)&dst,
5790             sh, ch,
5791             compute_crc,
5792             ecn_bits,
5793             mflowtype, mflowid, fibnum,
5794             vrf_id, port);
5795 out:
5796         if (m) {
5797                 sctp_m_freem(m);
5798         }
5799         return;
5800 }
5801
5802 #if defined(SCTP_MCORE_INPUT) && defined(SMP)
5803 extern int *sctp_cpuarry;
5804 #endif
5805
5806 int
5807 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED)
5808 {
5809         struct mbuf *m;
5810         int off;
5811
5812         m = *mp;
5813         off = *offp;
5814 #if defined(SCTP_MCORE_INPUT) && defined(SMP)
5815         if (mp_ncpus > 1) {
5816                 struct ip *ip;
5817                 struct sctphdr *sh;
5818                 int offset;
5819                 int cpu_to_use;
5820                 uint32_t flowid, tag;
5821
5822                 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
5823                         flowid = m->m_pkthdr.flowid;
5824                 } else {
5825                         /*
5826                          * No flow id built by lower layers fix it so we
5827                          * create one.
5828                          */
5829                         offset = off + sizeof(struct sctphdr);
5830                         if (SCTP_BUF_LEN(m) < offset) {
5831                                 if ((m = m_pullup(m, offset)) == NULL) {
5832                                         SCTP_STAT_INCR(sctps_hdrops);
5833                                         return (IPPROTO_DONE);
5834                                 }
5835                         }
5836                         ip = mtod(m, struct ip *);
5837                         sh = (struct sctphdr *)((caddr_t)ip + off);
5838                         tag = htonl(sh->v_tag);
5839                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
5840                         m->m_pkthdr.flowid = flowid;
5841                         M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH);
5842                 }
5843                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
5844                 sctp_queue_to_mcore(m, off, cpu_to_use);
5845                 return (IPPROTO_DONE);
5846         }
5847 #endif
5848         sctp_input_with_port(m, off, 0);
5849         return (IPPROTO_DONE);
5850 }
5851 #endif