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                                 asoc->cookie_preserve_req = ntohl(stale_cookie->stale_time);
1168                                 /* Double it to be more robust on RTX */
1169                                 if (asoc->cookie_preserve_req <= UINT32_MAX / 2) {
1170                                         asoc->cookie_preserve_req *= 2;
1171                                 } else {
1172                                         asoc->cookie_preserve_req = UINT32_MAX;
1173                                 }
1174                                 asoc->stale_cookie_count++;
1175                                 if (asoc->stale_cookie_count >
1176                                     asoc->max_init_times) {
1177                                         sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED);
1178                                         /* now free the asoc */
1179                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1180                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1181                                         return (-1);
1182                                 }
1183                                 /* blast back to INIT state */
1184                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
1185                                 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
1186                                 sctp_stop_all_cookie_timers(stcb);
1187                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1188                         }
1189                         break;
1190                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1191                         /*
1192                          * Nothing we can do here, we don't do hostname
1193                          * addresses so if the peer does not like my IPv6
1194                          * (or IPv4 for that matter) it does not matter. If
1195                          * they don't support that type of address, they can
1196                          * NOT possibly get that packet type... i.e. with no
1197                          * IPv6 you can't receive a IPv6 packet. so we can
1198                          * safely ignore this one. If we ever added support
1199                          * for HOSTNAME Addresses, then we would need to do
1200                          * something here.
1201                          */
1202                         break;
1203                 case SCTP_CAUSE_UNRECOG_CHUNK:
1204                         if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) {
1205                                 struct sctp_error_unrecognized_chunk *unrec_chunk;
1206
1207                                 unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause;
1208                                 sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type);
1209                         }
1210                         break;
1211                 case SCTP_CAUSE_UNRECOG_PARAM:
1212                         /* XXX: We only consider the first parameter */
1213                         if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) {
1214                                 struct sctp_paramhdr *unrec_parameter;
1215
1216                                 unrec_parameter = (struct sctp_paramhdr *)(cause + 1);
1217                                 sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type));
1218                         }
1219                         break;
1220                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1221                         /*
1222                          * We ignore this since the timer will drive out a
1223                          * new cookie anyway and there timer will drive us
1224                          * to send a SHUTDOWN_COMPLETE. We can't send one
1225                          * here since we don't have their tag.
1226                          */
1227                         break;
1228                 case SCTP_CAUSE_DELETING_LAST_ADDR:
1229                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1230                 case SCTP_CAUSE_DELETING_SRC_ADDR:
1231                         /*
1232                          * We should NOT get these here, but in a
1233                          * ASCONF-ACK.
1234                          */
1235                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n",
1236                             cause_code);
1237                         break;
1238                 case SCTP_CAUSE_OUT_OF_RESC:
1239                         /*
1240                          * And what, pray tell do we do with the fact that
1241                          * the peer is out of resources? Not really sure we
1242                          * could do anything but abort. I suspect this
1243                          * should have came WITH an abort instead of in a
1244                          * OP-ERROR.
1245                          */
1246                         break;
1247                 default:
1248                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n",
1249                             cause_code);
1250                         break;
1251                 }
1252                 adjust = SCTP_SIZE32(cause_length);
1253                 if (remaining_length >= adjust) {
1254                         remaining_length -= adjust;
1255                 } else {
1256                         remaining_length = 0;
1257                 }
1258                 cause = (struct sctp_error_cause *)((caddr_t)cause + adjust);
1259         }
1260         sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED);
1261         return (0);
1262 }
1263
1264 static int
1265 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1266     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
1267     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1268     struct sctp_nets *net, int *abort_no_unlock,
1269     uint8_t mflowtype, uint32_t mflowid,
1270     uint32_t vrf_id)
1271 {
1272         struct sctp_init_ack *init_ack;
1273         struct mbuf *op_err;
1274
1275         SCTPDBG(SCTP_DEBUG_INPUT2,
1276             "sctp_handle_init_ack: handling INIT-ACK\n");
1277
1278         if (stcb == NULL) {
1279                 SCTPDBG(SCTP_DEBUG_INPUT2,
1280                     "sctp_handle_init_ack: TCB is null\n");
1281                 return (-1);
1282         }
1283         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1284                 /* Invalid length */
1285                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1286                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1287                     src, dst, sh, op_err,
1288                     mflowtype, mflowid,
1289                     vrf_id, net->port);
1290                 *abort_no_unlock = 1;
1291                 return (-1);
1292         }
1293         init_ack = &cp->init;
1294         /* validate parameters */
1295         if (init_ack->initiate_tag == 0) {
1296                 /* protocol error... send an abort */
1297                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1298                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1299                     src, dst, sh, op_err,
1300                     mflowtype, mflowid,
1301                     vrf_id, net->port);
1302                 *abort_no_unlock = 1;
1303                 return (-1);
1304         }
1305         if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1306                 /* protocol error... send an abort */
1307                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1308                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1309                     src, dst, sh, op_err,
1310                     mflowtype, mflowid,
1311                     vrf_id, net->port);
1312                 *abort_no_unlock = 1;
1313                 return (-1);
1314         }
1315         if (init_ack->num_inbound_streams == 0) {
1316                 /* protocol error... send an abort */
1317                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1318                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1319                     src, dst, sh, op_err,
1320                     mflowtype, mflowid,
1321                     vrf_id, net->port);
1322                 *abort_no_unlock = 1;
1323                 return (-1);
1324         }
1325         if (init_ack->num_outbound_streams == 0) {
1326                 /* protocol error... send an abort */
1327                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1328                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1329                     src, dst, sh, op_err,
1330                     mflowtype, mflowid,
1331                     vrf_id, net->port);
1332                 *abort_no_unlock = 1;
1333                 return (-1);
1334         }
1335         /* process according to association state... */
1336         switch (SCTP_GET_STATE(stcb)) {
1337         case SCTP_STATE_COOKIE_WAIT:
1338                 /* this is the expected state for this chunk */
1339                 /* process the INIT-ACK parameters */
1340                 if (stcb->asoc.primary_destination->dest_state &
1341                     SCTP_ADDR_UNCONFIRMED) {
1342                         /*
1343                          * The primary is where we sent the INIT, we can
1344                          * always consider it confirmed when the INIT-ACK is
1345                          * returned. Do this before we load addresses
1346                          * though.
1347                          */
1348                         stcb->asoc.primary_destination->dest_state &=
1349                             ~SCTP_ADDR_UNCONFIRMED;
1350                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1351                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1352                 }
1353                 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
1354                     net, abort_no_unlock,
1355                     mflowtype, mflowid,
1356                     vrf_id) < 0) {
1357                         /* error in parsing parameters */
1358                         return (-1);
1359                 }
1360                 /* update our state */
1361                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1362                 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_ECHOED);
1363
1364                 /* reset the RTO calc */
1365                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1366                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1367                             stcb->asoc.overall_error_count,
1368                             0,
1369                             SCTP_FROM_SCTP_INPUT,
1370                             __LINE__);
1371                 }
1372                 stcb->asoc.overall_error_count = 0;
1373                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1374                 /*
1375                  * collapse the init timer back in case of a exponential
1376                  * backoff
1377                  */
1378                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1379                     stcb, net);
1380                 /*
1381                  * the send at the end of the inbound data processing will
1382                  * cause the cookie to be sent
1383                  */
1384                 break;
1385         case SCTP_STATE_SHUTDOWN_SENT:
1386                 /* incorrect state... discard */
1387                 break;
1388         case SCTP_STATE_COOKIE_ECHOED:
1389                 /* incorrect state... discard */
1390                 break;
1391         case SCTP_STATE_OPEN:
1392                 /* incorrect state... discard */
1393                 break;
1394         case SCTP_STATE_EMPTY:
1395         case SCTP_STATE_INUSE:
1396         default:
1397                 /* incorrect state... discard */
1398                 return (-1);
1399                 break;
1400         }
1401         SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1402         return (0);
1403 }
1404
1405 static struct sctp_tcb *
1406 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1407     struct sockaddr *src, struct sockaddr *dst,
1408     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1409     struct sctp_inpcb *inp, struct sctp_nets **netp,
1410     struct sockaddr *init_src, int *notification,
1411     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1412     uint8_t mflowtype, uint32_t mflowid,
1413     uint32_t vrf_id, uint16_t port);
1414
1415 /*
1416  * handle a state cookie for an existing association m: input packet mbuf
1417  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1418  * "split" mbuf and the cookie signature does not exist offset: offset into
1419  * mbuf to the cookie-echo chunk
1420  */
1421 static struct sctp_tcb *
1422 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1423     struct sockaddr *src, struct sockaddr *dst,
1424     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1425     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1426     struct sockaddr *init_src, int *notification,
1427     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1428     uint8_t mflowtype, uint32_t mflowid,
1429     uint32_t vrf_id, uint16_t port)
1430 {
1431         struct sctp_association *asoc;
1432         struct sctp_init_chunk *init_cp, init_buf;
1433         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1434         struct sctp_nets *net;
1435         struct mbuf *op_err;
1436         struct timeval old;
1437         int init_offset, initack_offset, i;
1438         int retval;
1439         int spec_flag = 0;
1440         uint32_t how_indx;
1441 #if defined(SCTP_DETAILED_STR_STATS)
1442         int j;
1443 #endif
1444
1445         net = *netp;
1446         /* I know that the TCB is non-NULL from the caller */
1447         asoc = &stcb->asoc;
1448         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1449                 if (asoc->cookie_how[how_indx] == 0)
1450                         break;
1451         }
1452         if (how_indx < sizeof(asoc->cookie_how)) {
1453                 asoc->cookie_how[how_indx] = 1;
1454         }
1455         if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1456                 /* SHUTDOWN came in after sending INIT-ACK */
1457                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1458                 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, "");
1459                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
1460                     mflowtype, mflowid, inp->fibnum,
1461                     vrf_id, net->port);
1462                 if (how_indx < sizeof(asoc->cookie_how))
1463                         asoc->cookie_how[how_indx] = 2;
1464                 return (NULL);
1465         }
1466         /*
1467          * find and validate the INIT chunk in the cookie (peer's info) the
1468          * INIT should start after the cookie-echo header struct (chunk
1469          * header, state cookie header struct)
1470          */
1471         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1472
1473         init_cp = (struct sctp_init_chunk *)
1474             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1475             (uint8_t *)&init_buf);
1476         if (init_cp == NULL) {
1477                 /* could not pull a INIT chunk in cookie */
1478                 return (NULL);
1479         }
1480         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1481                 return (NULL);
1482         }
1483         /*
1484          * find and validate the INIT-ACK chunk in the cookie (my info) the
1485          * INIT-ACK follows the INIT chunk
1486          */
1487         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1488         initack_cp = (struct sctp_init_ack_chunk *)
1489             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1490             (uint8_t *)&initack_buf);
1491         if (initack_cp == NULL) {
1492                 /* could not pull INIT-ACK chunk in cookie */
1493                 return (NULL);
1494         }
1495         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1496                 return (NULL);
1497         }
1498         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1499             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1500                 /*
1501                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
1502                  * to get into the OPEN state
1503                  */
1504                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1505                         /*-
1506                          * Opps, this means that we somehow generated two vtag's
1507                          * the same. I.e. we did:
1508                          *  Us               Peer
1509                          *   <---INIT(tag=a)------
1510                          *   ----INIT-ACK(tag=t)-->
1511                          *   ----INIT(tag=t)------> *1
1512                          *   <---INIT-ACK(tag=a)---
1513                          *   <----CE(tag=t)------------- *2
1514                          *
1515                          * At point *1 we should be generating a different
1516                          * tag t'. Which means we would throw away the CE and send
1517                          * ours instead. Basically this is case C (throw away side).
1518                          */
1519                         if (how_indx < sizeof(asoc->cookie_how))
1520                                 asoc->cookie_how[how_indx] = 17;
1521                         return (NULL);
1522                 }
1523                 switch (SCTP_GET_STATE(stcb)) {
1524                 case SCTP_STATE_COOKIE_WAIT:
1525                 case SCTP_STATE_COOKIE_ECHOED:
1526                         /*
1527                          * INIT was sent but got a COOKIE_ECHO with the
1528                          * correct tags... just accept it...but we must
1529                          * process the init so that we can make sure we have
1530                          * the right seq no's.
1531                          */
1532                         /* First we must process the INIT !! */
1533                         retval = sctp_process_init(init_cp, stcb);
1534                         if (retval < 0) {
1535                                 if (how_indx < sizeof(asoc->cookie_how))
1536                                         asoc->cookie_how[how_indx] = 3;
1537                                 return (NULL);
1538                         }
1539                         /* we have already processed the INIT so no problem */
1540                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp,
1541                             stcb, net,
1542                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1543                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp,
1544                             stcb, net,
1545                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1546                         /* update current state */
1547                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)
1548                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1549                         else
1550                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1551
1552                         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1553                         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1554                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1555                                     stcb->sctp_ep, stcb, NULL);
1556                         }
1557                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1558                         sctp_stop_all_cookie_timers(stcb);
1559                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1560                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1561                             (!SCTP_IS_LISTENING(inp))) {
1562                                 /*
1563                                  * Here is where collision would go if we
1564                                  * did a connect() and instead got a
1565                                  * init/init-ack/cookie done before the
1566                                  * init-ack came back..
1567                                  */
1568                                 stcb->sctp_ep->sctp_flags |=
1569                                     SCTP_PCB_FLAGS_CONNECTED;
1570                                 soisconnected(stcb->sctp_socket);
1571                         }
1572                         /* notify upper layer */
1573                         *notification = SCTP_NOTIFY_ASSOC_UP;
1574                         /*
1575                          * since we did not send a HB make sure we don't
1576                          * double things
1577                          */
1578                         old.tv_sec = cookie->time_entered.tv_sec;
1579                         old.tv_usec = cookie->time_entered.tv_usec;
1580                         net->hb_responded = 1;
1581                         sctp_calculate_rto(stcb, asoc, net, &old,
1582                             SCTP_RTT_FROM_NON_DATA);
1583
1584                         if (stcb->asoc.sctp_autoclose_ticks &&
1585                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1586                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1587                                     inp, stcb, NULL);
1588                         }
1589                         break;
1590                 default:
1591                         /*
1592                          * we're in the OPEN state (or beyond), so peer must
1593                          * have simply lost the COOKIE-ACK
1594                          */
1595                         break;
1596                 }               /* end switch */
1597                 sctp_stop_all_cookie_timers(stcb);
1598                 /*
1599                  * We ignore the return code here.. not sure if we should
1600                  * somehow abort.. but we do have an existing asoc. This
1601                  * really should not fail.
1602                  */
1603                 if (sctp_load_addresses_from_init(stcb, m,
1604                     init_offset + sizeof(struct sctp_init_chunk),
1605                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
1606                         if (how_indx < sizeof(asoc->cookie_how))
1607                                 asoc->cookie_how[how_indx] = 4;
1608                         return (NULL);
1609                 }
1610                 /* respond with a COOKIE-ACK */
1611                 sctp_toss_old_cookies(stcb, asoc);
1612                 sctp_send_cookie_ack(stcb);
1613                 if (how_indx < sizeof(asoc->cookie_how))
1614                         asoc->cookie_how[how_indx] = 5;
1615                 return (stcb);
1616         }
1617
1618         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1619             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1620             cookie->tie_tag_my_vtag == 0 &&
1621             cookie->tie_tag_peer_vtag == 0) {
1622                 /*
1623                  * case C in Section 5.2.4 Table 2: XMOO silently discard
1624                  */
1625                 if (how_indx < sizeof(asoc->cookie_how))
1626                         asoc->cookie_how[how_indx] = 6;
1627                 return (NULL);
1628         }
1629         /*
1630          * If nat support, and the below and stcb is established, send back
1631          * a ABORT(colliding state) if we are established.
1632          */
1633         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) &&
1634             (asoc->peer_supports_nat) &&
1635             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1636             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1637             (asoc->peer_vtag == 0)))) {
1638                 /*
1639                  * Special case - Peer's support nat. We may have two init's
1640                  * that we gave out the same tag on since one was not
1641                  * established.. i.e. we get INIT from host-1 behind the nat
1642                  * and we respond tag-a, we get a INIT from host-2 behind
1643                  * the nat and we get tag-a again. Then we bring up host-1
1644                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1645                  * Now we have colliding state. We must send an abort here
1646                  * with colliding state indication.
1647                  */
1648                 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, "");
1649                 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
1650                     mflowtype, mflowid, inp->fibnum,
1651                     vrf_id, port);
1652                 return (NULL);
1653         }
1654         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1655             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1656             (asoc->peer_vtag == 0))) {
1657                 /*
1658                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1659                  * should be ok, re-accept peer info
1660                  */
1661                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1662                         /*
1663                          * Extension of case C. If we hit this, then the
1664                          * random number generator returned the same vtag
1665                          * when we first sent our INIT-ACK and when we later
1666                          * sent our INIT. The side with the seq numbers that
1667                          * are different will be the one that normnally
1668                          * would have hit case C. This in effect "extends"
1669                          * our vtags in this collision case to be 64 bits.
1670                          * The same collision could occur aka you get both
1671                          * vtag and seq number the same twice in a row.. but
1672                          * is much less likely. If it did happen then we
1673                          * would proceed through and bring up the assoc.. we
1674                          * may end up with the wrong stream setup however..
1675                          * which would be bad.. but there is no way to
1676                          * tell.. until we send on a stream that does not
1677                          * exist :-)
1678                          */
1679                         if (how_indx < sizeof(asoc->cookie_how))
1680                                 asoc->cookie_how[how_indx] = 7;
1681
1682                         return (NULL);
1683                 }
1684                 if (how_indx < sizeof(asoc->cookie_how))
1685                         asoc->cookie_how[how_indx] = 8;
1686                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1687                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1688                 sctp_stop_all_cookie_timers(stcb);
1689                 /*
1690                  * since we did not send a HB make sure we don't double
1691                  * things
1692                  */
1693                 net->hb_responded = 1;
1694                 if (stcb->asoc.sctp_autoclose_ticks &&
1695                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1696                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1697                             NULL);
1698                 }
1699                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1700                 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1701
1702                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1703                         /*
1704                          * Ok the peer probably discarded our data (if we
1705                          * echoed a cookie+data). So anything on the
1706                          * sent_queue should be marked for retransmit, we
1707                          * may not get something to kick us so it COULD
1708                          * still take a timeout to move these.. but it can't
1709                          * hurt to mark them.
1710                          */
1711                         struct sctp_tmit_chunk *chk;
1712
1713                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1714                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1715                                         chk->sent = SCTP_DATAGRAM_RESEND;
1716                                         sctp_flight_size_decrease(chk);
1717                                         sctp_total_flight_decrease(stcb, chk);
1718                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1719                                         spec_flag++;
1720                                 }
1721                         }
1722                 }
1723                 /* process the INIT info (peer's info) */
1724                 retval = sctp_process_init(init_cp, stcb);
1725                 if (retval < 0) {
1726                         if (how_indx < sizeof(asoc->cookie_how))
1727                                 asoc->cookie_how[how_indx] = 9;
1728                         return (NULL);
1729                 }
1730                 if (sctp_load_addresses_from_init(stcb, m,
1731                     init_offset + sizeof(struct sctp_init_chunk),
1732                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
1733                         if (how_indx < sizeof(asoc->cookie_how))
1734                                 asoc->cookie_how[how_indx] = 10;
1735                         return (NULL);
1736                 }
1737                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
1738                     (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
1739                         *notification = SCTP_NOTIFY_ASSOC_UP;
1740
1741                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1742                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1743                             (!SCTP_IS_LISTENING(inp))) {
1744                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
1745                                 soisconnected(stcb->sctp_socket);
1746                         }
1747                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)
1748                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1749                         else
1750                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1751                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1752                 } else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
1753                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1754                 } else {
1755                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1756                 }
1757                 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1758                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1759                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1760                             stcb->sctp_ep, stcb, NULL);
1761                 }
1762                 sctp_stop_all_cookie_timers(stcb);
1763                 sctp_toss_old_cookies(stcb, asoc);
1764                 sctp_send_cookie_ack(stcb);
1765                 if (spec_flag) {
1766                         /*
1767                          * only if we have retrans set do we do this. What
1768                          * this call does is get only the COOKIE-ACK out and
1769                          * then when we return the normal call to
1770                          * sctp_chunk_output will get the retrans out behind
1771                          * this.
1772                          */
1773                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1774                 }
1775                 if (how_indx < sizeof(asoc->cookie_how))
1776                         asoc->cookie_how[how_indx] = 11;
1777
1778                 return (stcb);
1779         }
1780         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1781             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1782             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1783             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1784             cookie->tie_tag_peer_vtag != 0) {
1785                 struct sctpasochead *head;
1786
1787                 if (asoc->peer_supports_nat) {
1788                         /*
1789                          * This is a gross gross hack. Just call the
1790                          * cookie_new code since we are allowing a duplicate
1791                          * association. I hope this works...
1792                          */
1793                         return (sctp_process_cookie_new(m, iphlen, offset, src, dst,
1794                             sh, cookie, cookie_len,
1795                             inp, netp, init_src, notification,
1796                             auth_skipped, auth_offset, auth_len,
1797                             mflowtype, mflowid,
1798                             vrf_id, port));
1799                 }
1800                 /*
1801                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1802                  */
1803                 /* temp code */
1804                 if (how_indx < sizeof(asoc->cookie_how))
1805                         asoc->cookie_how[how_indx] = 12;
1806                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net,
1807                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1808                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1809                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
1810
1811                 /* notify upper layer */
1812                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1813                 atomic_add_int(&stcb->asoc.refcnt, 1);
1814                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) &&
1815                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1816                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) {
1817                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1818                 }
1819                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
1820                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1821                 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
1822                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1823                 }
1824                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1825                         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1826                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1827                             stcb->sctp_ep, stcb, NULL);
1828
1829                 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
1830                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1831                         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1832                 }
1833                 asoc->pre_open_streams =
1834                     ntohs(initack_cp->init.num_outbound_streams);
1835                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1836                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1837                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1838
1839                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1840
1841                 asoc->str_reset_seq_in = asoc->init_seq_number;
1842
1843                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1844                 if (asoc->mapping_array) {
1845                         memset(asoc->mapping_array, 0,
1846                             asoc->mapping_array_size);
1847                 }
1848                 if (asoc->nr_mapping_array) {
1849                         memset(asoc->nr_mapping_array, 0,
1850                             asoc->mapping_array_size);
1851                 }
1852                 SCTP_TCB_UNLOCK(stcb);
1853                 SCTP_INP_INFO_WLOCK();
1854                 SCTP_INP_WLOCK(stcb->sctp_ep);
1855                 SCTP_TCB_LOCK(stcb);
1856                 atomic_add_int(&stcb->asoc.refcnt, -1);
1857                 /* send up all the data */
1858                 SCTP_TCB_SEND_LOCK(stcb);
1859
1860                 sctp_report_all_outbound(stcb, 0, SCTP_SO_LOCKED);
1861                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1862                         stcb->asoc.strmout[i].chunks_on_queues = 0;
1863 #if defined(SCTP_DETAILED_STR_STATS)
1864                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
1865                                 asoc->strmout[i].abandoned_sent[j] = 0;
1866                                 asoc->strmout[i].abandoned_unsent[j] = 0;
1867                         }
1868 #else
1869                         asoc->strmout[i].abandoned_sent[0] = 0;
1870                         asoc->strmout[i].abandoned_unsent[0] = 0;
1871 #endif
1872                         stcb->asoc.strmout[i].sid = i;
1873                         stcb->asoc.strmout[i].next_mid_ordered = 0;
1874                         stcb->asoc.strmout[i].next_mid_unordered = 0;
1875                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
1876                 }
1877                 /* process the INIT-ACK info (my info) */
1878                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1879                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1880
1881                 /* pull from vtag hash */
1882                 LIST_REMOVE(stcb, sctp_asocs);
1883                 /* re-insert to new vtag position */
1884                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1885                     SCTP_BASE_INFO(hashasocmark))];
1886                 /*
1887                  * put it in the bucket in the vtag hash of assoc's for the
1888                  * system
1889                  */
1890                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
1891
1892                 SCTP_TCB_SEND_UNLOCK(stcb);
1893                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
1894                 SCTP_INP_INFO_WUNLOCK();
1895                 asoc->total_flight = 0;
1896                 asoc->total_flight_count = 0;
1897                 /* process the INIT info (peer's info) */
1898                 retval = sctp_process_init(init_cp, stcb);
1899                 if (retval < 0) {
1900                         if (how_indx < sizeof(asoc->cookie_how))
1901                                 asoc->cookie_how[how_indx] = 13;
1902
1903                         return (NULL);
1904                 }
1905                 /*
1906                  * since we did not send a HB make sure we don't double
1907                  * things
1908                  */
1909                 net->hb_responded = 1;
1910
1911                 if (sctp_load_addresses_from_init(stcb, m,
1912                     init_offset + sizeof(struct sctp_init_chunk),
1913                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
1914                         if (how_indx < sizeof(asoc->cookie_how))
1915                                 asoc->cookie_how[how_indx] = 14;
1916
1917                         return (NULL);
1918                 }
1919                 /* respond with a COOKIE-ACK */
1920                 sctp_stop_all_cookie_timers(stcb);
1921                 sctp_toss_old_cookies(stcb, asoc);
1922                 sctp_send_cookie_ack(stcb);
1923                 if (how_indx < sizeof(asoc->cookie_how))
1924                         asoc->cookie_how[how_indx] = 15;
1925
1926                 return (stcb);
1927         }
1928         if (how_indx < sizeof(asoc->cookie_how))
1929                 asoc->cookie_how[how_indx] = 16;
1930         /* all other cases... */
1931         return (NULL);
1932 }
1933
1934 /*
1935  * handle a state cookie for a new association m: input packet mbuf chain--
1936  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
1937  * and the cookie signature does not exist offset: offset into mbuf to the
1938  * cookie-echo chunk length: length of the cookie chunk to: where the init
1939  * was from returns a new TCB
1940  */
1941 static struct sctp_tcb *
1942 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1943     struct sockaddr *src, struct sockaddr *dst,
1944     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1945     struct sctp_inpcb *inp, struct sctp_nets **netp,
1946     struct sockaddr *init_src, int *notification,
1947     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1948     uint8_t mflowtype, uint32_t mflowid,
1949     uint32_t vrf_id, uint16_t port)
1950 {
1951         struct sctp_tcb *stcb;
1952         struct sctp_init_chunk *init_cp, init_buf;
1953         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1954         union sctp_sockstore store;
1955         struct sctp_association *asoc;
1956         int init_offset, initack_offset, initack_limit;
1957         int retval;
1958         int error = 0;
1959         uint8_t auth_chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
1960
1961         /*
1962          * find and validate the INIT chunk in the cookie (peer's info) the
1963          * INIT should start after the cookie-echo header struct (chunk
1964          * header, state cookie header struct)
1965          */
1966         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
1967         init_cp = (struct sctp_init_chunk *)
1968             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1969             (uint8_t *)&init_buf);
1970         if (init_cp == NULL) {
1971                 /* could not pull a INIT chunk in cookie */
1972                 SCTPDBG(SCTP_DEBUG_INPUT1,
1973                     "process_cookie_new: could not pull INIT chunk hdr\n");
1974                 return (NULL);
1975         }
1976         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1977                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
1978                 return (NULL);
1979         }
1980         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1981         /*
1982          * find and validate the INIT-ACK chunk in the cookie (my info) the
1983          * INIT-ACK follows the INIT chunk
1984          */
1985         initack_cp = (struct sctp_init_ack_chunk *)
1986             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1987             (uint8_t *)&initack_buf);
1988         if (initack_cp == NULL) {
1989                 /* could not pull INIT-ACK chunk in cookie */
1990                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
1991                 return (NULL);
1992         }
1993         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1994                 return (NULL);
1995         }
1996         /*
1997          * NOTE: We can't use the INIT_ACK's chk_length to determine the
1998          * "initack_limit" value.  This is because the chk_length field
1999          * includes the length of the cookie, but the cookie is omitted when
2000          * the INIT and INIT_ACK are tacked onto the cookie...
2001          */
2002         initack_limit = offset + cookie_len;
2003
2004         /*
2005          * now that we know the INIT/INIT-ACK are in place, create a new TCB
2006          * and popluate
2007          */
2008
2009         /*
2010          * Here we do a trick, we set in NULL for the proc/thread argument.
2011          * We do this since in effect we only use the p argument when the
2012          * socket is unbound and we must do an implicit bind. Since we are
2013          * getting a cookie, we cannot be unbound.
2014          */
2015         stcb = sctp_aloc_assoc(inp, init_src, &error,
2016             ntohl(initack_cp->init.initiate_tag), vrf_id,
2017             ntohs(initack_cp->init.num_outbound_streams),
2018             port,
2019             (struct thread *)NULL,
2020             SCTP_DONT_INITIALIZE_AUTH_PARAMS);
2021         if (stcb == NULL) {
2022                 struct mbuf *op_err;
2023
2024                 /* memory problem? */
2025                 SCTPDBG(SCTP_DEBUG_INPUT1,
2026                     "process_cookie_new: no room for another TCB!\n");
2027                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2028                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2029                     src, dst, sh, op_err,
2030                     mflowtype, mflowid,
2031                     vrf_id, port);
2032                 return (NULL);
2033         }
2034         asoc = &stcb->asoc;
2035         /* get scope variables out of cookie */
2036         asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
2037         asoc->scope.site_scope = cookie->site_scope;
2038         asoc->scope.local_scope = cookie->local_scope;
2039         asoc->scope.loopback_scope = cookie->loopback_scope;
2040
2041         if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2042             (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2043                 struct mbuf *op_err;
2044
2045                 /*
2046                  * Houston we have a problem. The EP changed while the
2047                  * cookie was in flight. Only recourse is to abort the
2048                  * association.
2049                  */
2050                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2051                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2052                     src, dst, sh, op_err,
2053                     mflowtype, mflowid,
2054                     vrf_id, port);
2055                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2056                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2057                 return (NULL);
2058         }
2059         /* process the INIT-ACK info (my info) */
2060         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2061         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2062         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2063         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2064         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2065         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2066         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2067         asoc->str_reset_seq_in = asoc->init_seq_number;
2068
2069         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2070
2071         /* process the INIT info (peer's info) */
2072         retval = sctp_process_init(init_cp, stcb);
2073         if (retval < 0) {
2074                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2075                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2076                 return (NULL);
2077         }
2078         /* load all addresses */
2079         if (sctp_load_addresses_from_init(stcb, m,
2080             init_offset + sizeof(struct sctp_init_chunk), initack_offset,
2081             src, dst, init_src, port)) {
2082                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2083                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2084                 return (NULL);
2085         }
2086         /*
2087          * verify any preceding AUTH chunk that was skipped
2088          */
2089         /* pull the local authentication parameters from the cookie/init-ack */
2090         sctp_auth_get_cookie_params(stcb, m,
2091             initack_offset + sizeof(struct sctp_init_ack_chunk),
2092             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2093         if (auth_skipped) {
2094                 struct sctp_auth_chunk *auth;
2095
2096                 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) {
2097                         auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2098                 } else {
2099                         auth = NULL;
2100                 }
2101                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2102                         /* auth HMAC failed, dump the assoc and packet */
2103                         SCTPDBG(SCTP_DEBUG_AUTH1,
2104                             "COOKIE-ECHO: AUTH failed\n");
2105                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2106                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_21);
2107                         return (NULL);
2108                 } else {
2109                         /* remaining chunks checked... good to go */
2110                         stcb->asoc.authenticated = 1;
2111                 }
2112         }
2113
2114         /*
2115          * if we're doing ASCONFs, check to see if we have any new local
2116          * addresses that need to get added to the peer (eg. addresses
2117          * changed while cookie echo in flight).  This needs to be done
2118          * after we go to the OPEN state to do the correct asconf
2119          * processing. else, make sure we have the correct addresses in our
2120          * lists
2121          */
2122
2123         /* warning, we re-use sin, sin6, sa_store here! */
2124         /* pull in local_address (our "from" address) */
2125         switch (cookie->laddr_type) {
2126 #ifdef INET
2127         case SCTP_IPV4_ADDRESS:
2128                 /* source addr is IPv4 */
2129                 memset(&store.sin, 0, sizeof(struct sockaddr_in));
2130                 store.sin.sin_family = AF_INET;
2131                 store.sin.sin_len = sizeof(struct sockaddr_in);
2132                 store.sin.sin_addr.s_addr = cookie->laddress[0];
2133                 break;
2134 #endif
2135 #ifdef INET6
2136         case SCTP_IPV6_ADDRESS:
2137                 /* source addr is IPv6 */
2138                 memset(&store.sin6, 0, sizeof(struct sockaddr_in6));
2139                 store.sin6.sin6_family = AF_INET6;
2140                 store.sin6.sin6_len = sizeof(struct sockaddr_in6);
2141                 store.sin6.sin6_scope_id = cookie->scope_id;
2142                 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr));
2143                 break;
2144 #endif
2145         default:
2146                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2147                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
2148                 return (NULL);
2149         }
2150
2151         /* update current state */
2152         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2153         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
2154         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2155                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2156                     stcb->sctp_ep, stcb, NULL);
2157         }
2158         sctp_stop_all_cookie_timers(stcb);
2159         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2160         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2161
2162         /* set up to notify upper layer */
2163         *notification = SCTP_NOTIFY_ASSOC_UP;
2164         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2165             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2166             (!SCTP_IS_LISTENING(inp))) {
2167                 /*
2168                  * This is an endpoint that called connect() how it got a
2169                  * cookie that is NEW is a bit of a mystery. It must be that
2170                  * the INIT was sent, but before it got there.. a complete
2171                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2172                  * should have went to the other code.. not here.. oh well..
2173                  * a bit of protection is worth having..
2174                  */
2175                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2176                 soisconnected(stcb->sctp_socket);
2177         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2178             (SCTP_IS_LISTENING(inp))) {
2179                 /*
2180                  * We don't want to do anything with this one. Since it is
2181                  * the listening guy. The timer will get started for
2182                  * accepted connections in the caller.
2183                  */
2184                 ;
2185         }
2186         if (stcb->asoc.sctp_autoclose_ticks &&
2187             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2188                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2189         }
2190         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2191         *netp = sctp_findnet(stcb, init_src);
2192         if (*netp != NULL) {
2193                 struct timeval old;
2194
2195                 /*
2196                  * Since we did not send a HB, make sure we don't double
2197                  * things.
2198                  */
2199                 (*netp)->hb_responded = 1;
2200                 /* Calculate the RTT. */
2201                 old.tv_sec = cookie->time_entered.tv_sec;
2202                 old.tv_usec = cookie->time_entered.tv_usec;
2203                 sctp_calculate_rto(stcb, asoc, *netp, &old, SCTP_RTT_FROM_NON_DATA);
2204         }
2205         /* respond with a COOKIE-ACK */
2206         sctp_send_cookie_ack(stcb);
2207
2208         /*
2209          * check the address lists for any ASCONFs that need to be sent
2210          * AFTER the cookie-ack is sent
2211          */
2212         sctp_check_address_list(stcb, m,
2213             initack_offset + sizeof(struct sctp_init_ack_chunk),
2214             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2215             &store.sa, cookie->local_scope, cookie->site_scope,
2216             cookie->ipv4_scope, cookie->loopback_scope);
2217
2218         return (stcb);
2219 }
2220
2221 /*
2222  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2223  * we NEED to make sure we are not already using the vtag. If so we
2224  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2225         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2226                                                             SCTP_BASE_INFO(hashasocmark))];
2227         LIST_FOREACH(stcb, head, sctp_asocs) {
2228                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2229                        -- SEND ABORT - TRY AGAIN --
2230                 }
2231         }
2232 */
2233
2234 /*
2235  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2236  * existing (non-NULL) TCB
2237  */
2238 static struct mbuf *
2239 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2240     struct sockaddr *src, struct sockaddr *dst,
2241     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2242     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2243     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2244     struct sctp_tcb **locked_tcb,
2245     uint8_t mflowtype, uint32_t mflowid,
2246     uint32_t vrf_id, uint16_t port)
2247 {
2248         struct sctp_state_cookie *cookie;
2249         struct sctp_tcb *l_stcb = *stcb;
2250         struct sctp_inpcb *l_inp;
2251         struct sockaddr *to;
2252         struct sctp_pcb *ep;
2253         struct mbuf *m_sig;
2254         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2255         uint8_t *sig;
2256         uint8_t cookie_ok = 0;
2257         unsigned int sig_offset, cookie_offset;
2258         unsigned int cookie_len;
2259         struct timeval now;
2260         struct timeval time_expires;
2261         int notification = 0;
2262         struct sctp_nets *netl;
2263         int had_a_existing_tcb = 0;
2264         int send_int_conf = 0;
2265 #ifdef INET
2266         struct sockaddr_in sin;
2267 #endif
2268 #ifdef INET6
2269         struct sockaddr_in6 sin6;
2270 #endif
2271
2272         SCTPDBG(SCTP_DEBUG_INPUT2,
2273             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2274
2275         if (inp_p == NULL) {
2276                 return (NULL);
2277         }
2278         cookie = &cp->cookie;
2279         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2280         cookie_len = ntohs(cp->ch.chunk_length);
2281
2282         if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2283             sizeof(struct sctp_init_chunk) +
2284             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2285                 /* cookie too small */
2286                 return (NULL);
2287         }
2288         if ((cookie->peerport != sh->src_port) ||
2289             (cookie->myport != sh->dest_port) ||
2290             (cookie->my_vtag != sh->v_tag)) {
2291                 /*
2292                  * invalid ports or bad tag.  Note that we always leave the
2293                  * v_tag in the header in network order and when we stored
2294                  * it in the my_vtag slot we also left it in network order.
2295                  * This maintains the match even though it may be in the
2296                  * opposite byte order of the machine :->
2297                  */
2298                 return (NULL);
2299         }
2300         /*
2301          * split off the signature into its own mbuf (since it should not be
2302          * calculated in the sctp_hmac_m() call).
2303          */
2304         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2305         m_sig = m_split(m, sig_offset, M_NOWAIT);
2306         if (m_sig == NULL) {
2307                 /* out of memory or ?? */
2308                 return (NULL);
2309         }
2310 #ifdef SCTP_MBUF_LOGGING
2311         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2312                 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT);
2313         }
2314 #endif
2315
2316         /*
2317          * compute the signature/digest for the cookie
2318          */
2319         ep = &(*inp_p)->sctp_ep;
2320         l_inp = *inp_p;
2321         if (l_stcb) {
2322                 SCTP_TCB_UNLOCK(l_stcb);
2323         }
2324         SCTP_INP_RLOCK(l_inp);
2325         if (l_stcb) {
2326                 SCTP_TCB_LOCK(l_stcb);
2327         }
2328         /* which cookie is it? */
2329         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2330             (ep->current_secret_number != ep->last_secret_number)) {
2331                 /* it's the old cookie */
2332                 (void)sctp_hmac_m(SCTP_HMAC,
2333                     (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2334                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2335         } else {
2336                 /* it's the current cookie */
2337                 (void)sctp_hmac_m(SCTP_HMAC,
2338                     (uint8_t *)ep->secret_key[(int)ep->current_secret_number],
2339                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2340         }
2341         /* get the signature */
2342         SCTP_INP_RUNLOCK(l_inp);
2343         sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig);
2344         if (sig == NULL) {
2345                 /* couldn't find signature */
2346                 sctp_m_freem(m_sig);
2347                 return (NULL);
2348         }
2349         /* compare the received digest with the computed digest */
2350         if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2351                 /* try the old cookie? */
2352                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2353                     (ep->current_secret_number != ep->last_secret_number)) {
2354                         /* compute digest with old */
2355                         (void)sctp_hmac_m(SCTP_HMAC,
2356                             (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2357                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2358                         /* compare */
2359                         if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2360                                 cookie_ok = 1;
2361                 }
2362         } else {
2363                 cookie_ok = 1;
2364         }
2365
2366         /*
2367          * Now before we continue we must reconstruct our mbuf so that
2368          * normal processing of any other chunks will work.
2369          */
2370         {
2371                 struct mbuf *m_at;
2372
2373                 m_at = m;
2374                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2375                         m_at = SCTP_BUF_NEXT(m_at);
2376                 }
2377                 SCTP_BUF_NEXT(m_at) = m_sig;
2378         }
2379
2380         if (cookie_ok == 0) {
2381                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2382                 SCTPDBG(SCTP_DEBUG_INPUT2,
2383                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2384                     (uint32_t)offset, cookie_offset, sig_offset);
2385                 return (NULL);
2386         }
2387
2388         /*
2389          * check the cookie timestamps to be sure it's not stale
2390          */
2391         (void)SCTP_GETTIME_TIMEVAL(&now);
2392         /* Expire time is in Ticks, so we convert to seconds */
2393         time_expires.tv_sec = cookie->time_entered.tv_sec + sctp_ticks_to_secs(cookie->cookie_life);
2394         time_expires.tv_usec = cookie->time_entered.tv_usec;
2395         if (timevalcmp(&now, &time_expires, >)) {
2396                 /* cookie is stale! */
2397                 struct mbuf *op_err;
2398                 struct sctp_error_stale_cookie *cause;
2399                 struct timeval diff;
2400                 uint32_t staleness;
2401
2402                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie),
2403                     0, M_NOWAIT, 1, MT_DATA);
2404                 if (op_err == NULL) {
2405                         /* FOOBAR */
2406                         return (NULL);
2407                 }
2408                 /* Set the len */
2409                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie);
2410                 cause = mtod(op_err, struct sctp_error_stale_cookie *);
2411                 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE);
2412                 cause->cause.length = htons((sizeof(struct sctp_paramhdr) +
2413                     (sizeof(uint32_t))));
2414                 diff = now;
2415                 timevalsub(&diff, &time_expires);
2416                 if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) {
2417                         staleness = UINT32_MAX;
2418                 } else {
2419                         staleness = diff.tv_sec * 1000000;
2420                 }
2421                 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) {
2422                         staleness += diff.tv_usec;
2423                 } else {
2424                         staleness = UINT32_MAX;
2425                 }
2426                 cause->stale_time = htonl(staleness);
2427                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
2428                     mflowtype, mflowid, l_inp->fibnum,
2429                     vrf_id, port);
2430                 return (NULL);
2431         }
2432         /*
2433          * Now we must see with the lookup address if we have an existing
2434          * asoc. This will only happen if we were in the COOKIE-WAIT state
2435          * and a INIT collided with us and somewhere the peer sent the
2436          * cookie on another address besides the single address our assoc
2437          * had for him. In this case we will have one of the tie-tags set at
2438          * least AND the address field in the cookie can be used to look it
2439          * up.
2440          */
2441         to = NULL;
2442         switch (cookie->addr_type) {
2443 #ifdef INET6
2444         case SCTP_IPV6_ADDRESS:
2445                 memset(&sin6, 0, sizeof(sin6));
2446                 sin6.sin6_family = AF_INET6;
2447                 sin6.sin6_len = sizeof(sin6);
2448                 sin6.sin6_port = sh->src_port;
2449                 sin6.sin6_scope_id = cookie->scope_id;
2450                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2451                     sizeof(sin6.sin6_addr.s6_addr));
2452                 to = (struct sockaddr *)&sin6;
2453                 break;
2454 #endif
2455 #ifdef INET
2456         case SCTP_IPV4_ADDRESS:
2457                 memset(&sin, 0, sizeof(sin));
2458                 sin.sin_family = AF_INET;
2459                 sin.sin_len = sizeof(sin);
2460                 sin.sin_port = sh->src_port;
2461                 sin.sin_addr.s_addr = cookie->address[0];
2462                 to = (struct sockaddr *)&sin;
2463                 break;
2464 #endif
2465         default:
2466                 /* This should not happen */
2467                 return (NULL);
2468         }
2469         if (*stcb == NULL) {
2470                 /* Yep, lets check */
2471                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
2472                 if (*stcb == NULL) {
2473                         /*
2474                          * We should have only got back the same inp. If we
2475                          * got back a different ep we have a problem. The
2476                          * original findep got back l_inp and now
2477                          */
2478                         if (l_inp != *inp_p) {
2479                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2480                         }
2481                 } else {
2482                         if (*locked_tcb == NULL) {
2483                                 /*
2484                                  * In this case we found the assoc only
2485                                  * after we locked the create lock. This
2486                                  * means we are in a colliding case and we
2487                                  * must make sure that we unlock the tcb if
2488                                  * its one of the cases where we throw away
2489                                  * the incoming packets.
2490                                  */
2491                                 *locked_tcb = *stcb;
2492
2493                                 /*
2494                                  * We must also increment the inp ref count
2495                                  * since the ref_count flags was set when we
2496                                  * did not find the TCB, now we found it
2497                                  * which reduces the refcount.. we must
2498                                  * raise it back out to balance it all :-)
2499                                  */
2500                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2501                                 if ((*stcb)->sctp_ep != l_inp) {
2502                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2503                                             (void *)(*stcb)->sctp_ep, (void *)l_inp);
2504                                 }
2505                         }
2506                 }
2507         }
2508
2509         cookie_len -= SCTP_SIGNATURE_SIZE;
2510         if (*stcb == NULL) {
2511                 /* this is the "normal" case... get a new TCB */
2512                 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
2513                     cookie, cookie_len, *inp_p,
2514                     netp, to, &notification,
2515                     auth_skipped, auth_offset, auth_len,
2516                     mflowtype, mflowid,
2517                     vrf_id, port);
2518         } else {
2519                 /* this is abnormal... cookie-echo on existing TCB */
2520                 had_a_existing_tcb = 1;
2521                 *stcb = sctp_process_cookie_existing(m, iphlen, offset,
2522                     src, dst, sh,
2523                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2524                     &notification, auth_skipped, auth_offset, auth_len,
2525                     mflowtype, mflowid,
2526                     vrf_id, port);
2527         }
2528
2529         if (*stcb == NULL) {
2530                 /* still no TCB... must be bad cookie-echo */
2531                 return (NULL);
2532         }
2533         if (*netp != NULL) {
2534                 (*netp)->flowtype = mflowtype;
2535                 (*netp)->flowid = mflowid;
2536         }
2537         /*
2538          * Ok, we built an association so confirm the address we sent the
2539          * INIT-ACK to.
2540          */
2541         netl = sctp_findnet(*stcb, to);
2542         /*
2543          * This code should in theory NOT run but
2544          */
2545         if (netl == NULL) {
2546                 /* TSNH! Huh, why do I need to add this address here? */
2547                 if (sctp_add_remote_addr(*stcb, to, NULL, port,
2548                     SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2549                         return (NULL);
2550                 }
2551                 netl = sctp_findnet(*stcb, to);
2552         }
2553         if (netl) {
2554                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2555                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2556                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2557                             netl);
2558                         send_int_conf = 1;
2559                 }
2560         }
2561         sctp_start_net_timers(*stcb);
2562         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2563                 if (!had_a_existing_tcb ||
2564                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2565                         /*
2566                          * If we have a NEW cookie or the connect never
2567                          * reached the connected state during collision we
2568                          * must do the TCP accept thing.
2569                          */
2570                         struct socket *so, *oso;
2571                         struct sctp_inpcb *inp;
2572
2573                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2574                                 /*
2575                                  * For a restart we will keep the same
2576                                  * socket, no need to do anything. I THINK!!
2577                                  */
2578                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2579                                 if (send_int_conf) {
2580                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2581                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2582                                 }
2583                                 return (m);
2584                         }
2585                         oso = (*inp_p)->sctp_socket;
2586                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2587                         SCTP_TCB_UNLOCK((*stcb));
2588                         CURVNET_SET(oso->so_vnet);
2589                         so = sonewconn(oso, 0
2590                             );
2591                         CURVNET_RESTORE();
2592                         SCTP_TCB_LOCK((*stcb));
2593                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2594
2595                         if (so == NULL) {
2596                                 struct mbuf *op_err;
2597
2598                                 /* Too many sockets */
2599                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2600                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2601                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2602                                     src, dst, sh, op_err,
2603                                     mflowtype, mflowid,
2604                                     vrf_id, port);
2605                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC,
2606                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
2607                                 return (NULL);
2608                         }
2609                         inp = (struct sctp_inpcb *)so->so_pcb;
2610                         SCTP_INP_INCR_REF(inp);
2611                         /*
2612                          * We add the unbound flag here so that if we get an
2613                          * soabort() before we get the move_pcb done, we
2614                          * will properly cleanup.
2615                          */
2616                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2617                             SCTP_PCB_FLAGS_CONNECTED |
2618                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2619                             SCTP_PCB_FLAGS_UNBOUND |
2620                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2621                             SCTP_PCB_FLAGS_DONT_WAKE);
2622                         inp->sctp_features = (*inp_p)->sctp_features;
2623                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2624                         inp->sctp_socket = so;
2625                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2626                         inp->max_cwnd = (*inp_p)->max_cwnd;
2627                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2628                         inp->ecn_supported = (*inp_p)->ecn_supported;
2629                         inp->prsctp_supported = (*inp_p)->prsctp_supported;
2630                         inp->auth_supported = (*inp_p)->auth_supported;
2631                         inp->asconf_supported = (*inp_p)->asconf_supported;
2632                         inp->reconfig_supported = (*inp_p)->reconfig_supported;
2633                         inp->nrsack_supported = (*inp_p)->nrsack_supported;
2634                         inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
2635                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2636                         inp->sctp_context = (*inp_p)->sctp_context;
2637                         inp->local_strreset_support = (*inp_p)->local_strreset_support;
2638                         inp->fibnum = (*inp_p)->fibnum;
2639                         inp->inp_starting_point_for_iterator = NULL;
2640                         /*
2641                          * copy in the authentication parameters from the
2642                          * original endpoint
2643                          */
2644                         if (inp->sctp_ep.local_hmacs)
2645                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2646                         inp->sctp_ep.local_hmacs =
2647                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2648                         if (inp->sctp_ep.local_auth_chunks)
2649                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2650                         inp->sctp_ep.local_auth_chunks =
2651                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2652
2653                         /*
2654                          * Now we must move it from one hash table to
2655                          * another and get the tcb in the right place.
2656                          */
2657
2658                         /*
2659                          * This is where the one-2-one socket is put into
2660                          * the accept state waiting for the accept!
2661                          */
2662                         if (*stcb) {
2663                                 SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE);
2664                         }
2665                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2666
2667                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2668                         SCTP_TCB_UNLOCK((*stcb));
2669
2670                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2671                             0);
2672                         SCTP_TCB_LOCK((*stcb));
2673                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2674
2675                         /*
2676                          * now we must check to see if we were aborted while
2677                          * the move was going on and the lock/unlock
2678                          * happened.
2679                          */
2680                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2681                                 /*
2682                                  * yep it was, we leave the assoc attached
2683                                  * to the socket since the sctp_inpcb_free()
2684                                  * call will send an abort for us.
2685                                  */
2686                                 SCTP_INP_DECR_REF(inp);
2687                                 return (NULL);
2688                         }
2689                         SCTP_INP_DECR_REF(inp);
2690                         /* Switch over to the new guy */
2691                         *inp_p = inp;
2692                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2693                         if (send_int_conf) {
2694                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2695                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2696                         }
2697
2698                         /*
2699                          * Pull it from the incomplete queue and wake the
2700                          * guy
2701                          */
2702                         soisconnected(so);
2703                         return (m);
2704                 }
2705         }
2706         if (notification) {
2707                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2708         }
2709         if (send_int_conf) {
2710                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2711                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2712         }
2713         return (m);
2714 }
2715
2716 static void
2717 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2718     struct sctp_tcb *stcb, struct sctp_nets *net)
2719 {
2720         /* cp must not be used, others call this without a c-ack :-) */
2721         struct sctp_association *asoc;
2722         struct sctp_tmit_chunk *chk;
2723
2724         SCTPDBG(SCTP_DEBUG_INPUT2,
2725             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2726         if ((stcb == NULL) || (net == NULL)) {
2727                 return;
2728         }
2729
2730         asoc = &stcb->asoc;
2731         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
2732                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
2733                     asoc->overall_error_count,
2734                     0,
2735                     SCTP_FROM_SCTP_INPUT,
2736                     __LINE__);
2737         }
2738         asoc->overall_error_count = 0;
2739         sctp_stop_all_cookie_timers(stcb);
2740         /* process according to association state */
2741         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) {
2742                 /* state change only needed when I am in right state */
2743                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2744                 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
2745                 sctp_start_net_timers(stcb);
2746                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2747                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2748                             stcb->sctp_ep, stcb, NULL);
2749                 }
2750                 /* update RTO */
2751                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2752                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2753                 if (asoc->overall_error_count == 0) {
2754                         sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered,
2755                             SCTP_RTT_FROM_NON_DATA);
2756                 }
2757                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2758                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2759                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2760                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2761                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2762                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
2763                                 soisconnected(stcb->sctp_socket);
2764                         }
2765                 }
2766                 /*
2767                  * since we did not send a HB make sure we don't double
2768                  * things
2769                  */
2770                 net->hb_responded = 1;
2771
2772                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2773                         /*
2774                          * We don't need to do the asconf thing, nor hb or
2775                          * autoclose if the socket is closed.
2776                          */
2777                         goto closed_socket;
2778                 }
2779
2780                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2781                     stcb, net);
2782
2783                 if (stcb->asoc.sctp_autoclose_ticks &&
2784                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2785                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2786                             stcb->sctp_ep, stcb, NULL);
2787                 }
2788                 /*
2789                  * send ASCONF if parameters are pending and ASCONFs are
2790                  * allowed (eg. addresses changed when init/cookie echo were
2791                  * in flight)
2792                  */
2793                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2794                     (stcb->asoc.asconf_supported == 1) &&
2795                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2796 #ifdef SCTP_TIMER_BASED_ASCONF
2797                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2798                             stcb->sctp_ep, stcb,
2799                             stcb->asoc.primary_destination);
2800 #else
2801                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2802                             SCTP_ADDR_NOT_LOCKED);
2803 #endif
2804                 }
2805         }
2806 closed_socket:
2807         /* Toss the cookie if I can */
2808         sctp_toss_old_cookies(stcb, asoc);
2809         /* Restart the timer if we have pending data */
2810         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
2811                 if (chk->whoTo != NULL) {
2812                         break;
2813                 }
2814         }
2815         if (chk != NULL) {
2816                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
2817         }
2818 }
2819
2820 static void
2821 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
2822     struct sctp_tcb *stcb)
2823 {
2824         struct sctp_nets *net;
2825         struct sctp_tmit_chunk *lchk;
2826         struct sctp_ecne_chunk bkup;
2827         uint8_t override_bit;
2828         uint32_t tsn, window_data_tsn;
2829         int len;
2830         unsigned int pkt_cnt;
2831
2832         len = ntohs(cp->ch.chunk_length);
2833         if ((len != sizeof(struct sctp_ecne_chunk)) &&
2834             (len != sizeof(struct old_sctp_ecne_chunk))) {
2835                 return;
2836         }
2837         if (len == sizeof(struct old_sctp_ecne_chunk)) {
2838                 /* Its the old format */
2839                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
2840                 bkup.num_pkts_since_cwr = htonl(1);
2841                 cp = &bkup;
2842         }
2843         SCTP_STAT_INCR(sctps_recvecne);
2844         tsn = ntohl(cp->tsn);
2845         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
2846         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
2847         if (lchk == NULL) {
2848                 window_data_tsn = stcb->asoc.sending_seq - 1;
2849         } else {
2850                 window_data_tsn = lchk->rec.data.tsn;
2851         }
2852
2853         /* Find where it was sent to if possible. */
2854         net = NULL;
2855         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
2856                 if (lchk->rec.data.tsn == tsn) {
2857                         net = lchk->whoTo;
2858                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
2859                         break;
2860                 }
2861                 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) {
2862                         break;
2863                 }
2864         }
2865         if (net == NULL) {
2866                 /*
2867                  * What to do. A previous send of a CWR was possibly lost.
2868                  * See how old it is, we may have it marked on the actual
2869                  * net.
2870                  */
2871                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
2872                         if (tsn == net->last_cwr_tsn) {
2873                                 /* Found him, send it off */
2874                                 break;
2875                         }
2876                 }
2877                 if (net == NULL) {
2878                         /*
2879                          * If we reach here, we need to send a special CWR
2880                          * that says hey, we did this a long time ago and
2881                          * you lost the response.
2882                          */
2883                         net = TAILQ_FIRST(&stcb->asoc.nets);
2884                         if (net == NULL) {
2885                                 /* TSNH */
2886                                 return;
2887                         }
2888                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
2889                 } else {
2890                         override_bit = 0;
2891                 }
2892         } else {
2893                 override_bit = 0;
2894         }
2895         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
2896             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
2897                 /*
2898                  * JRS - Use the congestion control given in the pluggable
2899                  * CC module
2900                  */
2901                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
2902                 /*
2903                  * We reduce once every RTT. So we will only lower cwnd at
2904                  * the next sending seq i.e. the window_data_tsn
2905                  */
2906                 net->cwr_window_tsn = window_data_tsn;
2907                 net->ecn_ce_pkt_cnt += pkt_cnt;
2908                 net->lost_cnt = pkt_cnt;
2909                 net->last_cwr_tsn = tsn;
2910         } else {
2911                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
2912                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
2913                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
2914                         /*
2915                          * Another loss in the same window update how many
2916                          * marks/packets lost we have had.
2917                          */
2918                         int cnt = 1;
2919
2920                         if (pkt_cnt > net->lost_cnt) {
2921                                 /* Should be the case */
2922                                 cnt = (pkt_cnt - net->lost_cnt);
2923                                 net->ecn_ce_pkt_cnt += cnt;
2924                         }
2925                         net->lost_cnt = pkt_cnt;
2926                         net->last_cwr_tsn = tsn;
2927                         /*
2928                          * Most CC functions will ignore this call, since we
2929                          * are in-window yet of the initial CE the peer saw.
2930                          */
2931                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
2932                 }
2933         }
2934         /*
2935          * We always send a CWR this way if our previous one was lost our
2936          * peer will get an update, or if it is not time again to reduce we
2937          * still get the cwr to the peer. Note we set the override when we
2938          * could not find the TSN on the chunk or the destination network.
2939          */
2940         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
2941 }
2942
2943 static void
2944 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
2945 {
2946         /*
2947          * Here we get a CWR from the peer. We must look in the outqueue and
2948          * make sure that we have a covered ECNE in the control chunk part.
2949          * If so remove it.
2950          */
2951         struct sctp_tmit_chunk *chk, *nchk;
2952         struct sctp_ecne_chunk *ecne;
2953         int override;
2954         uint32_t cwr_tsn;
2955
2956         cwr_tsn = ntohl(cp->tsn);
2957         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
2958         TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) {
2959                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
2960                         continue;
2961                 }
2962                 if ((override == 0) && (chk->whoTo != net)) {
2963                         /* Must be from the right src unless override is set */
2964                         continue;
2965                 }
2966                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
2967                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
2968                         /* this covers this ECNE, we can remove it */
2969                         stcb->asoc.ecn_echo_cnt_onq--;
2970                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
2971                             sctp_next);
2972                         stcb->asoc.ctrl_queue_cnt--;
2973                         sctp_m_freem(chk->data);
2974                         chk->data = NULL;
2975                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
2976                         if (override == 0) {
2977                                 break;
2978                         }
2979                 }
2980         }
2981 }
2982
2983 static void
2984 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
2985     struct sctp_tcb *stcb, struct sctp_nets *net)
2986 {
2987
2988         SCTPDBG(SCTP_DEBUG_INPUT2,
2989             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
2990         if (stcb == NULL)
2991                 return;
2992
2993         /* process according to association state */
2994         if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
2995                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
2996                 SCTPDBG(SCTP_DEBUG_INPUT2,
2997                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
2998                 SCTP_TCB_UNLOCK(stcb);
2999                 return;
3000         }
3001         /* notify upper layer protocol */
3002         if (stcb->sctp_socket) {
3003                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3004         }
3005 #ifdef INVARIANTS
3006         if (!TAILQ_EMPTY(&stcb->asoc.send_queue) ||
3007             !TAILQ_EMPTY(&stcb->asoc.sent_queue) ||
3008             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
3009                 panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
3010         }
3011 #endif
3012         /* stop the timer */
3013         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net,
3014             SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3015         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3016         /* free the TCB */
3017         SCTPDBG(SCTP_DEBUG_INPUT2,
3018             "sctp_handle_shutdown_complete: calls free-asoc\n");
3019         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
3020             SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3021         return;
3022 }
3023
3024 static int
3025 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3026     struct sctp_nets *net, uint8_t flg)
3027 {
3028         switch (desc->chunk_type) {
3029         case SCTP_DATA:
3030         case SCTP_IDATA:
3031                 /* find the tsn to resend (possibly) */
3032                 {
3033                         uint32_t tsn;
3034                         struct sctp_tmit_chunk *tp1;
3035
3036                         tsn = ntohl(desc->tsn_ifany);
3037                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3038                                 if (tp1->rec.data.tsn == tsn) {
3039                                         /* found it */
3040                                         break;
3041                                 }
3042                                 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) {
3043                                         /* not found */
3044                                         tp1 = NULL;
3045                                         break;
3046                                 }
3047                         }
3048                         if (tp1 == NULL) {
3049                                 /*
3050                                  * Do it the other way , aka without paying
3051                                  * attention to queue seq order.
3052                                  */
3053                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3054                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3055                                         if (tp1->rec.data.tsn == tsn) {
3056                                                 /* found it */
3057                                                 break;
3058                                         }
3059                                 }
3060                         }
3061                         if (tp1 == NULL) {
3062                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3063                         }
3064                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3065                                 if (((flg & SCTP_BADCRC) == 0) &&
3066                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3067                                         return (0);
3068                                 }
3069                                 if ((stcb->asoc.peers_rwnd == 0) &&
3070                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3071                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3072                                         return (0);
3073                                 }
3074                                 if (stcb->asoc.peers_rwnd == 0 &&
3075                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3076                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3077                                         return (0);
3078                                 }
3079                                 if ((uint32_t)SCTP_BUF_LEN(tp1->data) <
3080                                     SCTP_DATA_CHUNK_OVERHEAD(stcb) + SCTP_NUM_DB_TO_VERIFY) {
3081                                         /* Payload not matching. */
3082                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3083                                         return (-1);
3084                                 }
3085                                 if (memcmp(mtod(tp1->data, caddr_t)+SCTP_DATA_CHUNK_OVERHEAD(stcb),
3086                                     desc->data_bytes, SCTP_NUM_DB_TO_VERIFY) != 0) {
3087                                         /* Payload not matching. */
3088                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3089                                         return (-1);
3090                                 }
3091                                 if (tp1->do_rtt) {
3092                                         /*
3093                                          * this guy had a RTO calculation
3094                                          * pending on it, cancel it
3095                                          */
3096                                         if (tp1->whoTo->rto_needed == 0) {
3097                                                 tp1->whoTo->rto_needed = 1;
3098                                         }
3099                                         tp1->do_rtt = 0;
3100                                 }
3101                                 SCTP_STAT_INCR(sctps_pdrpmark);
3102                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3103                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3104                                 /*
3105                                  * mark it as if we were doing a FR, since
3106                                  * we will be getting gap ack reports behind
3107                                  * the info from the router.
3108                                  */
3109                                 tp1->rec.data.doing_fast_retransmit = 1;
3110                                 /*
3111                                  * mark the tsn with what sequences can
3112                                  * cause a new FR.
3113                                  */
3114                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3115                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3116                                 } else {
3117                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn;
3118                                 }
3119
3120                                 /* restart the timer */
3121                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3122                                     stcb, tp1->whoTo,
3123                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3124                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3125                                     stcb, tp1->whoTo);
3126
3127                                 /* fix counts and things */
3128                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3129                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3130                                             tp1->whoTo->flight_size,
3131                                             tp1->book_size,
3132                                             (uint32_t)(uintptr_t)stcb,
3133                                             tp1->rec.data.tsn);
3134                                 }
3135                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3136                                         sctp_flight_size_decrease(tp1);
3137                                         sctp_total_flight_decrease(stcb, tp1);
3138                                 }
3139                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3140                         } {
3141                                 /* audit code */
3142                                 unsigned int audit;
3143
3144                                 audit = 0;
3145                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3146                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3147                                                 audit++;
3148                                 }
3149                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3150                                     sctp_next) {
3151                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3152                                                 audit++;
3153                                 }
3154                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3155                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3156                                             audit, stcb->asoc.sent_queue_retran_cnt);
3157 #ifndef SCTP_AUDITING_ENABLED
3158                                         stcb->asoc.sent_queue_retran_cnt = audit;
3159 #endif
3160                                 }
3161                         }
3162                 }
3163                 break;
3164         case SCTP_ASCONF:
3165                 {
3166                         struct sctp_tmit_chunk *asconf;
3167
3168                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3169                             sctp_next) {
3170                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3171                                         break;
3172                                 }
3173                         }
3174                         if (asconf) {
3175                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3176                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3177                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3178                                 asconf->snd_count--;
3179                         }
3180                 }
3181                 break;
3182         case SCTP_INITIATION:
3183                 /* resend the INIT */
3184                 stcb->asoc.dropped_special_cnt++;
3185                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3186                         /*
3187                          * If we can get it in, in a few attempts we do
3188                          * this, otherwise we let the timer fire.
3189                          */
3190                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3191                             stcb, net,
3192                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
3193                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3194                 }
3195                 break;
3196         case SCTP_SELECTIVE_ACK:
3197         case SCTP_NR_SELECTIVE_ACK:
3198                 /* resend the sack */
3199                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3200                 break;
3201         case SCTP_HEARTBEAT_REQUEST:
3202                 /* resend a demand HB */
3203                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3204                         /*
3205                          * Only retransmit if we KNOW we wont destroy the
3206                          * tcb
3207                          */
3208                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3209                 }
3210                 break;
3211         case SCTP_SHUTDOWN:
3212                 sctp_send_shutdown(stcb, net);
3213                 break;
3214         case SCTP_SHUTDOWN_ACK:
3215                 sctp_send_shutdown_ack(stcb, net);
3216                 break;
3217         case SCTP_COOKIE_ECHO:
3218                 {
3219                         struct sctp_tmit_chunk *cookie;
3220
3221                         cookie = NULL;
3222                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3223                             sctp_next) {
3224                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3225                                         break;
3226                                 }
3227                         }
3228                         if (cookie) {
3229                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3230                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3231                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3232                                 sctp_stop_all_cookie_timers(stcb);
3233                         }
3234                 }
3235                 break;
3236         case SCTP_COOKIE_ACK:
3237                 sctp_send_cookie_ack(stcb);
3238                 break;
3239         case SCTP_ASCONF_ACK:
3240                 /* resend last asconf ack */
3241                 sctp_send_asconf_ack(stcb);
3242                 break;
3243         case SCTP_IFORWARD_CUM_TSN:
3244         case SCTP_FORWARD_CUM_TSN:
3245                 send_forward_tsn(stcb, &stcb->asoc);
3246                 break;
3247                 /* can't do anything with these */
3248         case SCTP_PACKET_DROPPED:
3249         case SCTP_INITIATION_ACK:       /* this should not happen */
3250         case SCTP_HEARTBEAT_ACK:
3251         case SCTP_ABORT_ASSOCIATION:
3252         case SCTP_OPERATION_ERROR:
3253         case SCTP_SHUTDOWN_COMPLETE:
3254         case SCTP_ECN_ECHO:
3255         case SCTP_ECN_CWR:
3256         default:
3257                 break;
3258         }
3259         return (0);
3260 }
3261
3262 void
3263 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3264 {
3265         uint32_t i;
3266         uint16_t temp;
3267
3268         /*
3269          * We set things to 0xffffffff since this is the last delivered
3270          * sequence and we will be sending in 0 after the reset.
3271          */
3272
3273         if (number_entries) {
3274                 for (i = 0; i < number_entries; i++) {
3275                         temp = ntohs(list[i]);
3276                         if (temp >= stcb->asoc.streamincnt) {
3277                                 continue;
3278                         }
3279                         stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff;
3280                 }
3281         } else {
3282                 list = NULL;
3283                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3284                         stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
3285                 }
3286         }
3287         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3288 }
3289
3290 static void
3291 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3292 {
3293         uint32_t i;
3294         uint16_t temp;
3295
3296         if (number_entries > 0) {
3297                 for (i = 0; i < number_entries; i++) {
3298                         temp = ntohs(list[i]);
3299                         if (temp >= stcb->asoc.streamoutcnt) {
3300                                 /* no such stream */
3301                                 continue;
3302                         }
3303                         stcb->asoc.strmout[temp].next_mid_ordered = 0;
3304                         stcb->asoc.strmout[temp].next_mid_unordered = 0;
3305                 }
3306         } else {
3307                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3308                         stcb->asoc.strmout[i].next_mid_ordered = 0;
3309                         stcb->asoc.strmout[i].next_mid_unordered = 0;
3310                 }
3311         }
3312         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3313 }
3314
3315 static void
3316 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3317 {
3318         uint32_t i;
3319         uint16_t temp;
3320
3321         if (number_entries > 0) {
3322                 for (i = 0; i < number_entries; i++) {
3323                         temp = ntohs(list[i]);
3324                         if (temp >= stcb->asoc.streamoutcnt) {
3325                                 /* no such stream */
3326                                 continue;
3327                         }
3328                         stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN;
3329                 }
3330         } else {
3331                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3332                         stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN;
3333                 }
3334         }
3335 }
3336
3337 struct sctp_stream_reset_request *
3338 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3339 {
3340         struct sctp_association *asoc;
3341         struct sctp_chunkhdr *ch;
3342         struct sctp_stream_reset_request *r;
3343         struct sctp_tmit_chunk *chk;
3344         int len, clen;
3345
3346         asoc = &stcb->asoc;
3347         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3348                 asoc->stream_reset_outstanding = 0;
3349                 return (NULL);
3350         }
3351         if (stcb->asoc.str_reset == NULL) {
3352                 asoc->stream_reset_outstanding = 0;
3353                 return (NULL);
3354         }
3355         chk = stcb->asoc.str_reset;
3356         if (chk->data == NULL) {
3357                 return (NULL);
3358         }
3359         if (bchk) {
3360                 /* he wants a copy of the chk pointer */
3361                 *bchk = chk;
3362         }
3363         clen = chk->send_size;
3364         ch = mtod(chk->data, struct sctp_chunkhdr *);
3365         r = (struct sctp_stream_reset_request *)(ch + 1);
3366         if (ntohl(r->request_seq) == seq) {
3367                 /* found it */
3368                 return (r);
3369         }
3370         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3371         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3372                 /* move to the next one, there can only be a max of two */
3373                 r = (struct sctp_stream_reset_request *)((caddr_t)r + len);
3374                 if (ntohl(r->request_seq) == seq) {
3375                         return (r);
3376                 }
3377         }
3378         /* that seq is not here */
3379         return (NULL);
3380 }
3381
3382 static void
3383 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3384 {
3385         struct sctp_association *asoc;
3386         struct sctp_tmit_chunk *chk;
3387
3388         asoc = &stcb->asoc;
3389         chk = asoc->str_reset;
3390         if (chk == NULL) {
3391                 return;
3392         }
3393         asoc->str_reset = NULL;
3394         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb,
3395             NULL, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28);
3396         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
3397         asoc->ctrl_queue_cnt--;
3398         if (chk->data) {
3399                 sctp_m_freem(chk->data);
3400                 chk->data = NULL;
3401         }
3402         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3403 }
3404
3405 static int
3406 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3407     uint32_t seq, uint32_t action,
3408     struct sctp_stream_reset_response *respin)
3409 {
3410         uint16_t type;
3411         int lparam_len;
3412         struct sctp_association *asoc = &stcb->asoc;
3413         struct sctp_tmit_chunk *chk;
3414         struct sctp_stream_reset_request *req_param;
3415         struct sctp_stream_reset_out_request *req_out_param;
3416         struct sctp_stream_reset_in_request *req_in_param;
3417         uint32_t number_entries;
3418
3419         if (asoc->stream_reset_outstanding == 0) {
3420                 /* duplicate */
3421                 return (0);
3422         }
3423         if (seq == stcb->asoc.str_reset_seq_out) {
3424                 req_param = sctp_find_stream_reset(stcb, seq, &chk);
3425                 if (req_param != NULL) {
3426                         stcb->asoc.str_reset_seq_out++;
3427                         type = ntohs(req_param->ph.param_type);
3428                         lparam_len = ntohs(req_param->ph.param_length);
3429                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3430                                 int no_clear = 0;
3431
3432                                 req_out_param = (struct sctp_stream_reset_out_request *)req_param;
3433                                 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3434                                 asoc->stream_reset_out_is_outstanding = 0;
3435                                 if (asoc->stream_reset_outstanding)
3436                                         asoc->stream_reset_outstanding--;
3437                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3438                                         /* do it */
3439                                         sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
3440                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3441                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3442                                 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) {
3443                                         /*
3444                                          * Set it up so we don't stop
3445                                          * retransmitting
3446                                          */
3447                                         asoc->stream_reset_outstanding++;
3448                                         stcb->asoc.str_reset_seq_out--;
3449                                         asoc->stream_reset_out_is_outstanding = 1;
3450                                         no_clear = 1;
3451                                 } else {
3452                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3453                                 }
3454                                 if (no_clear == 0) {
3455                                         sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams);
3456                                 }
3457                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3458                                 req_in_param = (struct sctp_stream_reset_in_request *)req_param;
3459                                 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3460                                 if (asoc->stream_reset_outstanding)
3461                                         asoc->stream_reset_outstanding--;
3462                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3463                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3464                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3465                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3466                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3467                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3468                                 }
3469                         } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3470                                 /* Ok we now may have more streams */
3471                                 int num_stream;
3472
3473                                 num_stream = stcb->asoc.strm_pending_add_size;
3474                                 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3475                                         /* TSNH */
3476                                         num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3477                                 }
3478                                 stcb->asoc.strm_pending_add_size = 0;
3479                                 if (asoc->stream_reset_outstanding)
3480                                         asoc->stream_reset_outstanding--;
3481                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3482                                         /* Put the new streams into effect */
3483                                         int i;
3484
3485                                         for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) {
3486                                                 asoc->strmout[i].state = SCTP_STREAM_OPEN;
3487                                         }
3488                                         asoc->streamoutcnt += num_stream;
3489                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3490                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3491                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3492                                             SCTP_STREAM_CHANGE_DENIED);
3493                                 } else {
3494                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3495                                             SCTP_STREAM_CHANGE_FAILED);
3496                                 }
3497                         } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3498                                 if (asoc->stream_reset_outstanding)
3499                                         asoc->stream_reset_outstanding--;
3500                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3501                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3502                                             SCTP_STREAM_CHANGE_DENIED);
3503                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3504                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3505                                             SCTP_STREAM_CHANGE_FAILED);
3506                                 }
3507                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3508                                 /**
3509                                  * a) Adopt the new in tsn.
3510                                  * b) reset the map
3511                                  * c) Adopt the new out-tsn
3512                                  */
3513                                 struct sctp_stream_reset_response_tsn *resp;
3514                                 struct sctp_forward_tsn_chunk fwdtsn;
3515                                 int abort_flag = 0;
3516
3517                                 if (respin == NULL) {
3518                                         /* huh ? */
3519                                         return (0);
3520                                 }
3521                                 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
3522                                         return (0);
3523                                 }
3524                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3525                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3526                                         asoc->stream_reset_outstanding--;
3527                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3528                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3529                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3530                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3531                                         if (abort_flag) {
3532                                                 return (1);
3533                                         }
3534                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3535                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3536                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3537                                         }
3538
3539                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3540                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3541                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3542
3543                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3544                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3545
3546                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3547                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3548
3549                                         sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3550                                         sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3551                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3552                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3553                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3554                                             SCTP_ASSOC_RESET_DENIED);
3555                                 } else {
3556                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3557                                             SCTP_ASSOC_RESET_FAILED);
3558                                 }
3559                         }
3560                         /* get rid of the request and get the request flags */
3561                         if (asoc->stream_reset_outstanding == 0) {
3562                                 sctp_clean_up_stream_reset(stcb);
3563                         }
3564                 }
3565         }
3566         if (asoc->stream_reset_outstanding == 0) {
3567                 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3568         }
3569         return (0);
3570 }
3571
3572 static void
3573 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3574     struct sctp_tmit_chunk *chk,
3575     struct sctp_stream_reset_in_request *req, int trunc)
3576 {
3577         uint32_t seq;
3578         int len, i;
3579         int number_entries;
3580         uint16_t temp;
3581
3582         /*
3583          * peer wants me to send a str-reset to him for my outgoing seq's if
3584          * seq_in is right.
3585          */
3586         struct sctp_association *asoc = &stcb->asoc;
3587
3588         seq = ntohl(req->request_seq);
3589         if (asoc->str_reset_seq_in == seq) {
3590                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3591                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3592                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3593                 } else if (trunc) {
3594                         /* Can't do it, since they exceeded our buffer size  */
3595                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3596                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3597                         len = ntohs(req->ph.param_length);
3598                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3599                         if (number_entries) {
3600                                 for (i = 0; i < number_entries; i++) {
3601                                         temp = ntohs(req->list_of_streams[i]);
3602                                         if (temp >= stcb->asoc.streamoutcnt) {
3603                                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3604                                                 goto bad_boy;
3605                                         }
3606                                         req->list_of_streams[i] = temp;
3607                                 }
3608                                 for (i = 0; i < number_entries; i++) {
3609                                         if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) {
3610                                                 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING;
3611                                         }
3612                                 }
3613                         } else {
3614                                 /* Its all */
3615                                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3616                                         if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN)
3617                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING;
3618                                 }
3619                         }
3620                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3621                 } else {
3622                         /* Can't do it, since we have sent one out */
3623                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3624                 }
3625 bad_boy:
3626                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3627                 asoc->str_reset_seq_in++;
3628         } else if (asoc->str_reset_seq_in - 1 == seq) {
3629                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3630         } else if (asoc->str_reset_seq_in - 2 == seq) {
3631                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3632         } else {
3633                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3634         }
3635         sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3636 }
3637
3638 static int
3639 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3640     struct sctp_tmit_chunk *chk,
3641     struct sctp_stream_reset_tsn_request *req)
3642 {
3643         /* reset all in and out and update the tsn */
3644         /*
3645          * A) reset my str-seq's on in and out. B) Select a receive next,
3646          * and set cum-ack to it. Also process this selected number as a
3647          * fwd-tsn as well. C) set in the response my next sending seq.
3648          */
3649         struct sctp_forward_tsn_chunk fwdtsn;
3650         struct sctp_association *asoc = &stcb->asoc;
3651         int abort_flag = 0;
3652         uint32_t seq;
3653
3654         seq = ntohl(req->request_seq);
3655         if (asoc->str_reset_seq_in == seq) {
3656                 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3657                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3658                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3659                 } else {
3660                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3661                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3662                         fwdtsn.ch.chunk_flags = 0;
3663                         fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3664                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3665                         if (abort_flag) {
3666                                 return (1);
3667                         }
3668                         asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3669                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3670                                 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3671                         }
3672                         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3673                         asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3674                         memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3675                         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3676                         memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3677                         atomic_add_int(&asoc->sending_seq, 1);
3678                         /* save off historical data for retrans */
3679                         asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3680                         asoc->last_sending_seq[0] = asoc->sending_seq;
3681                         asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3682                         asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3683                         sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3684                         sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3685                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3686                         sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3687                 }
3688                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3689                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3690                 asoc->str_reset_seq_in++;
3691         } else if (asoc->str_reset_seq_in - 1 == seq) {
3692                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3693                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3694         } else if (asoc->str_reset_seq_in - 2 == seq) {
3695                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3696                     asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3697         } else {
3698                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3699         }
3700         return (0);
3701 }
3702
3703 static void
3704 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3705     struct sctp_tmit_chunk *chk,
3706     struct sctp_stream_reset_out_request *req, int trunc)
3707 {
3708         uint32_t seq, tsn;
3709         int number_entries, len;
3710         struct sctp_association *asoc = &stcb->asoc;
3711
3712         seq = ntohl(req->request_seq);
3713
3714         /* now if its not a duplicate we process it */
3715         if (asoc->str_reset_seq_in == seq) {
3716                 len = ntohs(req->ph.param_length);
3717                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3718                 /*
3719                  * the sender is resetting, handle the list issue.. we must
3720                  * a) verify if we can do the reset, if so no problem b) If
3721                  * we can't do the reset we must copy the request. c) queue
3722                  * it, and setup the data in processor to trigger it off
3723                  * when needed and dequeue all the queued data.
3724                  */
3725                 tsn = ntohl(req->send_reset_at_tsn);
3726
3727                 /* move the reset action back one */
3728                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3729                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3730                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3731                 } else if (trunc) {
3732                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3733                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3734                         /* we can do it now */
3735                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3736                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3737                 } else {
3738                         /*
3739                          * we must queue it up and thus wait for the TSN's
3740                          * to arrive that are at or before tsn
3741                          */
3742                         struct sctp_stream_reset_list *liste;
3743                         int siz;
3744
3745                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3746                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3747                             siz, SCTP_M_STRESET);
3748                         if (liste == NULL) {
3749                                 /* gak out of memory */
3750                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3751                                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3752                                 return;
3753                         }
3754                         liste->seq = seq;
3755                         liste->tsn = tsn;
3756                         liste->number_entries = number_entries;
3757                         memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
3758                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3759                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS;
3760                 }
3761                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3762                 asoc->str_reset_seq_in++;
3763         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3764                 /*
3765                  * one seq back, just echo back last action since my
3766                  * response was lost.
3767                  */
3768                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3769         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3770                 /*
3771                  * two seq back, just echo back last action since my
3772                  * response was lost.
3773                  */
3774                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3775         } else {
3776                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3777         }
3778 }
3779
3780 static void
3781 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3782     struct sctp_stream_reset_add_strm *str_add)
3783 {
3784         /*
3785          * Peer is requesting to add more streams. If its within our
3786          * max-streams we will allow it.
3787          */
3788         uint32_t num_stream, i;
3789         uint32_t seq;
3790         struct sctp_association *asoc = &stcb->asoc;
3791         struct sctp_queued_to_read *ctl, *nctl;
3792
3793         /* Get the number. */
3794         seq = ntohl(str_add->request_seq);
3795         num_stream = ntohs(str_add->number_of_streams);
3796         /* Now what would be the new total? */
3797         if (asoc->str_reset_seq_in == seq) {
3798                 num_stream += stcb->asoc.streamincnt;
3799                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3800                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3801                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3802                 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
3803                     (num_stream > 0xffff)) {
3804                         /* We must reject it they ask for to many */
3805         denied:
3806                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3807                 } else {
3808                         /* Ok, we can do that :-) */
3809                         struct sctp_stream_in *oldstrm;
3810
3811                         /* save off the old */
3812                         oldstrm = stcb->asoc.strmin;
3813                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
3814                             (num_stream * sizeof(struct sctp_stream_in)),
3815                             SCTP_M_STRMI);
3816                         if (stcb->asoc.strmin == NULL) {
3817                                 stcb->asoc.strmin = oldstrm;
3818                                 goto denied;
3819                         }
3820                         /* copy off the old data */
3821                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
3822                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3823                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
3824                                 stcb->asoc.strmin[i].sid = i;
3825                                 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered;
3826                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
3827                                 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started;
3828                                 /* now anything on those queues? */
3829                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) {
3830                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm);
3831                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm);
3832                                 }
3833                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) {
3834                                         TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm);
3835                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm);
3836                                 }
3837                         }
3838                         /* Init the new streams */
3839                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
3840                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3841                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
3842                                 stcb->asoc.strmin[i].sid = i;
3843                                 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
3844                                 stcb->asoc.strmin[i].pd_api_started = 0;
3845                                 stcb->asoc.strmin[i].delivery_started = 0;
3846                         }
3847                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
3848                         /* update the size */
3849                         stcb->asoc.streamincnt = num_stream;
3850                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3851                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3852                 }
3853                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3854                 asoc->str_reset_seq_in++;
3855         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3856                 /*
3857                  * one seq back, just echo back last action since my
3858                  * response was lost.
3859                  */
3860                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3861         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3862                 /*
3863                  * two seq back, just echo back last action since my
3864                  * response was lost.
3865                  */
3866                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3867         } else {
3868                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3869         }
3870 }
3871
3872 static void
3873 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3874     struct sctp_stream_reset_add_strm *str_add)
3875 {
3876         /*
3877          * Peer is requesting to add more streams. If its within our
3878          * max-streams we will allow it.
3879          */
3880         uint16_t num_stream;
3881         uint32_t seq;
3882         struct sctp_association *asoc = &stcb->asoc;
3883
3884         /* Get the number. */
3885         seq = ntohl(str_add->request_seq);
3886         num_stream = ntohs(str_add->number_of_streams);
3887         /* Now what would be the new total? */
3888         if (asoc->str_reset_seq_in == seq) {
3889                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3890                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3891                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3892                 } else if (stcb->asoc.stream_reset_outstanding) {
3893                         /* We must reject it we have something pending */
3894                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3895                 } else {
3896                         /* Ok, we can do that :-) */
3897                         int mychk;
3898
3899                         mychk = stcb->asoc.streamoutcnt;
3900                         mychk += num_stream;
3901                         if (mychk < 0x10000) {
3902                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3903                                 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) {
3904                                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3905                                 }
3906                         } else {
3907                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3908                         }
3909                 }
3910                 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
3911                 asoc->str_reset_seq_in++;
3912         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3913                 /*
3914                  * one seq back, just echo back last action since my
3915                  * response was lost.
3916                  */
3917                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3918         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3919                 /*
3920                  * two seq back, just echo back last action since my
3921                  * response was lost.
3922                  */
3923                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3924         } else {
3925                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3926         }
3927 }
3928
3929 #ifdef __GNUC__
3930 __attribute__((noinline))
3931 #endif
3932 static int
3933 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
3934     struct sctp_chunkhdr *ch_req)
3935 {
3936         uint16_t remaining_length, param_len, ptype;
3937         struct sctp_paramhdr pstore;
3938         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
3939         uint32_t seq = 0;
3940         int num_req = 0;
3941         int trunc = 0;
3942         struct sctp_tmit_chunk *chk;
3943         struct sctp_chunkhdr *ch;
3944         struct sctp_paramhdr *ph;
3945         int ret_code = 0;
3946         int num_param = 0;
3947
3948         /* now it may be a reset or a reset-response */
3949         remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
3950
3951         /* setup for adding the response */
3952         sctp_alloc_a_chunk(stcb, chk);
3953         if (chk == NULL) {
3954                 return (ret_code);
3955         }
3956         chk->copy_by_ref = 0;
3957         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
3958         chk->rec.chunk_id.can_take_data = 0;
3959         chk->flags = 0;
3960         chk->asoc = &stcb->asoc;
3961         chk->no_fr_allowed = 0;
3962         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
3963         chk->book_size_scale = 0;
3964         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
3965         if (chk->data == NULL) {
3966 strres_nochunk:
3967                 if (chk->data) {
3968                         sctp_m_freem(chk->data);
3969                         chk->data = NULL;
3970                 }
3971                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3972                 return (ret_code);
3973         }
3974         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
3975
3976         /* setup chunk parameters */
3977         chk->sent = SCTP_DATAGRAM_UNSENT;
3978         chk->snd_count = 0;
3979         chk->whoTo = NULL;
3980
3981         ch = mtod(chk->data, struct sctp_chunkhdr *);
3982         ch->chunk_type = SCTP_STREAM_RESET;
3983         ch->chunk_flags = 0;
3984         ch->chunk_length = htons(chk->send_size);
3985         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
3986         offset += sizeof(struct sctp_chunkhdr);
3987         while (remaining_length >= sizeof(struct sctp_paramhdr)) {
3988                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore);
3989                 if (ph == NULL) {
3990                         /* TSNH */
3991                         break;
3992                 }
3993                 param_len = ntohs(ph->param_length);
3994                 if ((param_len > remaining_length) ||
3995                     (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
3996                         /* bad parameter length */
3997                         break;
3998                 }
3999                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
4000                     (uint8_t *)&cstore);
4001                 if (ph == NULL) {
4002                         /* TSNH */
4003                         break;
4004                 }
4005                 ptype = ntohs(ph->param_type);
4006                 num_param++;
4007                 if (param_len > sizeof(cstore)) {
4008                         trunc = 1;
4009                 } else {
4010                         trunc = 0;
4011                 }
4012                 if (num_param > SCTP_MAX_RESET_PARAMS) {
4013                         /* hit the max of parameters already sorry.. */
4014                         break;
4015                 }
4016                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4017                         struct sctp_stream_reset_out_request *req_out;
4018
4019                         if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
4020                                 break;
4021                         }
4022                         req_out = (struct sctp_stream_reset_out_request *)ph;
4023                         num_req++;
4024                         if (stcb->asoc.stream_reset_outstanding) {
4025                                 seq = ntohl(req_out->response_seq);
4026                                 if (seq == stcb->asoc.str_reset_seq_out) {
4027                                         /* implicit ack */
4028                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4029                                 }
4030                         }
4031                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4032                 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4033                         struct sctp_stream_reset_add_strm *str_add;
4034
4035                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4036                                 break;
4037                         }
4038                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4039                         num_req++;
4040                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4041                 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4042                         struct sctp_stream_reset_add_strm *str_add;
4043
4044                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4045                                 break;
4046                         }
4047                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4048                         num_req++;
4049                         sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4050                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4051                         struct sctp_stream_reset_in_request *req_in;
4052
4053                         num_req++;
4054                         req_in = (struct sctp_stream_reset_in_request *)ph;
4055                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4056                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4057                         struct sctp_stream_reset_tsn_request *req_tsn;
4058
4059                         num_req++;
4060                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4061                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4062                                 ret_code = 1;
4063                                 goto strres_nochunk;
4064                         }
4065                         /* no more */
4066                         break;
4067                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4068                         struct sctp_stream_reset_response *resp;
4069                         uint32_t result;
4070
4071                         if (param_len < sizeof(struct sctp_stream_reset_response)) {
4072                                 break;
4073                         }
4074                         resp = (struct sctp_stream_reset_response *)ph;
4075                         seq = ntohl(resp->response_seq);
4076                         result = ntohl(resp->result);
4077                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4078                                 ret_code = 1;
4079                                 goto strres_nochunk;
4080                         }
4081                 } else {
4082                         break;
4083                 }
4084                 offset += SCTP_SIZE32(param_len);
4085                 if (remaining_length >= SCTP_SIZE32(param_len)) {
4086                         remaining_length -= SCTP_SIZE32(param_len);
4087                 } else {
4088                         remaining_length = 0;
4089                 }
4090         }
4091         if (num_req == 0) {
4092                 /* we have no response free the stuff */
4093                 goto strres_nochunk;
4094         }
4095         /* ok we have a chunk to link in */
4096         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4097             chk,
4098             sctp_next);
4099         stcb->asoc.ctrl_queue_cnt++;
4100         return (ret_code);
4101 }
4102
4103 /*
4104  * Handle a router or endpoints report of a packet loss, there are two ways
4105  * to handle this, either we get the whole packet and must disect it
4106  * ourselves (possibly with truncation and or corruption) or it is a summary
4107  * from a middle box that did the disectting for us.
4108  */
4109 static void
4110 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4111     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4112 {
4113         struct sctp_chunk_desc desc;
4114         struct sctp_chunkhdr *chk_hdr;
4115         struct sctp_data_chunk *data_chunk;
4116         struct sctp_idata_chunk *idata_chunk;
4117         uint32_t bottle_bw, on_queue;
4118         uint32_t offset, chk_len;
4119         uint16_t trunc_len;
4120         uint16_t pktdrp_len;
4121         uint8_t pktdrp_flags;
4122
4123         KASSERT(sizeof(struct sctp_pktdrop_chunk) <= limit,
4124             ("PKTDROP chunk too small"));
4125         pktdrp_flags = cp->ch.chunk_flags;
4126         pktdrp_len = ntohs(cp->ch.chunk_length);
4127         KASSERT(limit <= pktdrp_len, ("Inconsistent limit"));
4128         if (pktdrp_flags & SCTP_PACKET_TRUNCATED) {
4129                 trunc_len = ntohs(cp->trunc_len);
4130                 if (trunc_len <= pktdrp_len - sizeof(struct sctp_pktdrop_chunk)) {
4131                         /* The peer plays games with us. */
4132                         return;
4133                 }
4134         } else {
4135                 trunc_len = 0;
4136         }
4137         limit -= sizeof(struct sctp_pktdrop_chunk);
4138         offset = 0;
4139         if (offset == limit) {
4140                 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4141                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4142                 }
4143         } else if (offset + sizeof(struct sctphdr) > limit) {
4144                 /* Only a partial SCTP common header. */
4145                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4146                 offset = limit;
4147         } else {
4148                 /* XXX: Check embedded SCTP common header. */
4149                 offset += sizeof(struct sctphdr);
4150         }
4151         /* Now parse through the chunks themselves. */
4152         while (offset < limit) {
4153                 if (offset + sizeof(struct sctp_chunkhdr) > limit) {
4154                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4155                         break;
4156                 }
4157                 chk_hdr = (struct sctp_chunkhdr *)(cp->data + offset);
4158                 desc.chunk_type = chk_hdr->chunk_type;
4159                 /* get amount we need to move */
4160                 chk_len = (uint32_t)ntohs(chk_hdr->chunk_length);
4161                 if (chk_len < sizeof(struct sctp_chunkhdr)) {
4162                         /* Someone is lying... */
4163                         break;
4164                 }
4165                 if (desc.chunk_type == SCTP_DATA) {
4166                         if (stcb->asoc.idata_supported) {
4167                                 /* Some is playing games with us. */
4168                                 break;
4169                         }
4170                         if (chk_len <= sizeof(struct sctp_data_chunk)) {
4171                                 /* Some is playing games with us. */
4172                                 break;
4173                         }
4174                         if (chk_len < sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY) {
4175                                 /*
4176                                  * Not enough data bytes available in the
4177                                  * chunk.
4178                                  */
4179                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4180                                 goto next_chunk;
4181                         }
4182                         if (offset + sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) {
4183                                 /* Not enough data in buffer. */
4184                                 break;
4185                         }
4186                         data_chunk = (struct sctp_data_chunk *)(cp->data + offset);
4187                         memcpy(desc.data_bytes, data_chunk + 1, SCTP_NUM_DB_TO_VERIFY);
4188                         desc.tsn_ifany = data_chunk->dp.tsn;
4189                         if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4190                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4191                         }
4192                 } else if (desc.chunk_type == SCTP_IDATA) {
4193                         if (!stcb->asoc.idata_supported) {
4194                                 /* Some is playing games with us. */
4195                                 break;
4196                         }
4197                         if (chk_len <= sizeof(struct sctp_idata_chunk)) {
4198                                 /* Some is playing games with us. */
4199                                 break;
4200                         }
4201                         if (chk_len < sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY) {
4202                                 /*
4203                                  * Not enough data bytes available in the
4204                                  * chunk.
4205                                  */
4206                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4207                                 goto next_chunk;
4208                         }
4209                         if (offset + sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) {
4210                                 /* Not enough data in buffer. */
4211                                 break;
4212                         }
4213                         idata_chunk = (struct sctp_idata_chunk *)(cp->data + offset);
4214                         memcpy(desc.data_bytes, idata_chunk + 1, SCTP_NUM_DB_TO_VERIFY);
4215                         desc.tsn_ifany = idata_chunk->dp.tsn;
4216                         if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4217                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4218                         }
4219                 } else {
4220                         if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4221                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4222                         }
4223                 }
4224                 if (process_chunk_drop(stcb, &desc, net, pktdrp_flags)) {
4225                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4226                         break;
4227                 }
4228 next_chunk:
4229                 offset += SCTP_SIZE32(chk_len);
4230         }
4231         /* Now update any rwnd --- possibly */
4232         if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4233                 /* From a peer, we get a rwnd report */
4234                 uint32_t a_rwnd;
4235
4236                 SCTP_STAT_INCR(sctps_pdrpfehos);
4237
4238                 bottle_bw = ntohl(cp->bottle_bw);
4239                 on_queue = ntohl(cp->current_onq);
4240                 if (bottle_bw && on_queue) {
4241                         /* a rwnd report is in here */
4242                         if (bottle_bw > on_queue)
4243                                 a_rwnd = bottle_bw - on_queue;
4244                         else
4245                                 a_rwnd = 0;
4246
4247                         if (a_rwnd == 0)
4248                                 stcb->asoc.peers_rwnd = 0;
4249                         else {
4250                                 if (a_rwnd > stcb->asoc.total_flight) {
4251                                         stcb->asoc.peers_rwnd =
4252                                             a_rwnd - stcb->asoc.total_flight;
4253                                 } else {
4254                                         stcb->asoc.peers_rwnd = 0;
4255                                 }
4256                                 if (stcb->asoc.peers_rwnd <
4257                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4258                                         /* SWS sender side engages */
4259                                         stcb->asoc.peers_rwnd = 0;
4260                                 }
4261                         }
4262                 }
4263         } else {
4264                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4265         }
4266
4267         /* now middle boxes in sat networks get a cwnd bump */
4268         if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) &&
4269             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4270             (stcb->asoc.sat_network)) {
4271                 /*
4272                  * This is debatable but for sat networks it makes sense
4273                  * Note if a T3 timer has went off, we will prohibit any
4274                  * changes to cwnd until we exit the t3 loss recovery.
4275                  */
4276                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4277                     net, cp, &bottle_bw, &on_queue);
4278         }
4279 }
4280
4281 /*
4282  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4283  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4284  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4285  * length of the complete packet outputs: - length: modified to remaining
4286  * length after control processing - netp: modified to new sctp_nets after
4287  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4288  * bad packet,...) otherwise return the tcb for this packet
4289  */
4290 #ifdef __GNUC__
4291 __attribute__((noinline))
4292 #endif
4293 static struct sctp_tcb *
4294 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4295     struct sockaddr *src, struct sockaddr *dst,
4296     struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4297     struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4298     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
4299     uint32_t vrf_id, uint16_t port)
4300 {
4301         struct sctp_association *asoc;
4302         struct mbuf *op_err;
4303         char msg[SCTP_DIAG_INFO_LEN];
4304         uint32_t vtag_in;
4305         int num_chunks = 0;     /* number of control chunks processed */
4306         uint32_t chk_length, contiguous;
4307         int ret;
4308         int abort_no_unlock = 0;
4309         int ecne_seen = 0;
4310
4311         /*
4312          * How big should this be, and should it be alloc'd? Lets try the
4313          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4314          * until we get into jumbo grams and such..
4315          */
4316         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4317         int got_auth = 0;
4318         uint32_t auth_offset = 0, auth_len = 0;
4319         int auth_skipped = 0;
4320         int asconf_cnt = 0;
4321
4322         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4323             iphlen, *offset, length, (void *)stcb);
4324
4325         if (stcb) {
4326                 SCTP_TCB_LOCK_ASSERT(stcb);
4327         }
4328         /* validate chunk header length... */
4329         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4330                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4331                     ntohs(ch->chunk_length));
4332                 *offset = length;
4333                 return (stcb);
4334         }
4335         /*
4336          * validate the verification tag
4337          */
4338         vtag_in = ntohl(sh->v_tag);
4339
4340         if (ch->chunk_type == SCTP_INITIATION) {
4341                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4342                     ntohs(ch->chunk_length), vtag_in);
4343                 if (vtag_in != 0) {
4344                         /* protocol error- silently discard... */
4345                         SCTP_STAT_INCR(sctps_badvtag);
4346                         if (stcb != NULL) {
4347                                 SCTP_TCB_UNLOCK(stcb);
4348                         }
4349                         return (NULL);
4350                 }
4351         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4352                 /*
4353                  * If there is no stcb, skip the AUTH chunk and process
4354                  * later after a stcb is found (to validate the lookup was
4355                  * valid.
4356                  */
4357                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4358                     (stcb == NULL) &&
4359                     (inp->auth_supported == 1)) {
4360                         /* save this chunk for later processing */
4361                         auth_skipped = 1;
4362                         auth_offset = *offset;
4363                         auth_len = ntohs(ch->chunk_length);
4364
4365                         /* (temporarily) move past this chunk */
4366                         *offset += SCTP_SIZE32(auth_len);
4367                         if (*offset >= length) {
4368                                 /* no more data left in the mbuf chain */
4369                                 *offset = length;
4370                                 return (NULL);
4371                         }
4372                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4373                             sizeof(struct sctp_chunkhdr), chunk_buf);
4374                 }
4375                 if (ch == NULL) {
4376                         /* Help */
4377                         *offset = length;
4378                         return (stcb);
4379                 }
4380                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4381                         goto process_control_chunks;
4382                 }
4383                 /*
4384                  * first check if it's an ASCONF with an unknown src addr we
4385                  * need to look inside to find the association
4386                  */
4387                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4388                         struct sctp_chunkhdr *asconf_ch = ch;
4389                         uint32_t asconf_offset = 0, asconf_len = 0;
4390
4391                         /* inp's refcount may be reduced */
4392                         SCTP_INP_INCR_REF(inp);
4393
4394                         asconf_offset = *offset;
4395                         do {
4396                                 asconf_len = ntohs(asconf_ch->chunk_length);
4397                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4398                                         break;
4399                                 stcb = sctp_findassociation_ep_asconf(m,
4400                                     *offset,
4401                                     dst,
4402                                     sh, &inp, netp, vrf_id);
4403                                 if (stcb != NULL)
4404                                         break;
4405                                 asconf_offset += SCTP_SIZE32(asconf_len);
4406                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4407                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4408                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4409                         if (stcb == NULL) {
4410                                 /*
4411                                  * reduce inp's refcount if not reduced in
4412                                  * sctp_findassociation_ep_asconf().
4413                                  */
4414                                 SCTP_INP_DECR_REF(inp);
4415                         }
4416
4417                         /* now go back and verify any auth chunk to be sure */
4418                         if (auth_skipped && (stcb != NULL)) {
4419                                 struct sctp_auth_chunk *auth;
4420
4421                                 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) {
4422                                         auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, chunk_buf);
4423                                         got_auth = 1;
4424                                         auth_skipped = 0;
4425                                 } else {
4426                                         auth = NULL;
4427                                 }
4428                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4429                                     auth_offset)) {
4430                                         /* auth HMAC failed so dump it */
4431                                         *offset = length;
4432                                         return (stcb);
4433                                 } else {
4434                                         /* remaining chunks are HMAC checked */
4435                                         stcb->asoc.authenticated = 1;
4436                                 }
4437                         }
4438                 }
4439                 if (stcb == NULL) {
4440                         SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4441                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4442                             msg);
4443                         /* no association, so it's out of the blue... */
4444                         sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
4445                             mflowtype, mflowid, inp->fibnum,
4446                             vrf_id, port);
4447                         *offset = length;
4448                         return (NULL);
4449                 }
4450                 asoc = &stcb->asoc;
4451                 /* ABORT and SHUTDOWN can use either v_tag... */
4452                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4453                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4454                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4455                         /* Take the T-bit always into account. */
4456                         if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
4457                             (vtag_in == asoc->my_vtag)) ||
4458                             (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
4459                             (asoc->peer_vtag != htonl(0)) &&
4460                             (vtag_in == asoc->peer_vtag))) {
4461                                 /* this is valid */
4462                         } else {
4463                                 /* drop this packet... */
4464                                 SCTP_STAT_INCR(sctps_badvtag);
4465                                 if (stcb != NULL) {
4466                                         SCTP_TCB_UNLOCK(stcb);
4467                                 }
4468                                 return (NULL);
4469                         }
4470                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4471                         if (vtag_in != asoc->my_vtag) {
4472                                 /*
4473                                  * this could be a stale SHUTDOWN-ACK or the
4474                                  * peer never got the SHUTDOWN-COMPLETE and
4475                                  * is still hung; we have started a new asoc
4476                                  * but it won't complete until the shutdown
4477                                  * is completed
4478                                  */
4479                                 if (stcb != NULL) {
4480                                         SCTP_TCB_UNLOCK(stcb);
4481                                 }
4482                                 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4483                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4484                                     msg);
4485                                 sctp_handle_ootb(m, iphlen, *offset, src, dst,
4486                                     sh, inp, op_err,
4487                                     mflowtype, mflowid, fibnum,
4488                                     vrf_id, port);
4489                                 return (NULL);
4490                         }
4491                 } else {
4492                         /* for all other chunks, vtag must match */
4493                         if (vtag_in != asoc->my_vtag) {
4494                                 /* invalid vtag... */
4495                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4496                                     "invalid vtag: %xh, expect %xh\n",
4497                                     vtag_in, asoc->my_vtag);
4498                                 SCTP_STAT_INCR(sctps_badvtag);
4499                                 if (stcb != NULL) {
4500                                         SCTP_TCB_UNLOCK(stcb);
4501                                 }
4502                                 *offset = length;
4503                                 return (NULL);
4504                         }
4505                 }
4506         }                       /* end if !SCTP_COOKIE_ECHO */
4507         /*
4508          * process all control chunks...
4509          */
4510         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4511             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4512             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4513             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
4514                 /* implied cookie-ack.. we must have lost the ack */
4515                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4516                     *netp);
4517         }
4518
4519 process_control_chunks:
4520         while (IS_SCTP_CONTROL(ch)) {
4521                 /* validate chunk length */
4522                 chk_length = ntohs(ch->chunk_length);
4523                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4524                     ch->chunk_type, chk_length);
4525                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4526                 if (chk_length < sizeof(*ch) ||
4527                     (*offset + (int)chk_length) > length) {
4528                         *offset = length;
4529                         return (stcb);
4530                 }
4531                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4532                 /*
4533                  * INIT and INIT-ACK only gets the init ack "header" portion
4534                  * only because we don't have to process the peer's COOKIE.
4535                  * All others get a complete chunk.
4536                  */
4537                 switch (ch->chunk_type) {
4538                 case SCTP_INITIATION:
4539                         contiguous = sizeof(struct sctp_init_chunk);
4540                         break;
4541                 case SCTP_INITIATION_ACK:
4542                         contiguous = sizeof(struct sctp_init_ack_chunk);
4543                         break;
4544                 default:
4545                         contiguous = min(chk_length, sizeof(chunk_buf));
4546                         break;
4547                 }
4548                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4549                     contiguous,
4550                     chunk_buf);
4551                 if (ch == NULL) {
4552                         *offset = length;
4553                         if (stcb != NULL) {
4554                                 SCTP_TCB_UNLOCK(stcb);
4555                         }
4556                         return (NULL);
4557                 }
4558
4559                 num_chunks++;
4560                 /* Save off the last place we got a control from */
4561                 if (stcb != NULL) {
4562                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4563                                 /*
4564                                  * allow last_control to be NULL if
4565                                  * ASCONF... ASCONF processing will find the
4566                                  * right net later
4567                                  */
4568                                 if ((netp != NULL) && (*netp != NULL))
4569                                         stcb->asoc.last_control_chunk_from = *netp;
4570                         }
4571                 }
4572 #ifdef SCTP_AUDITING_ENABLED
4573                 sctp_audit_log(0xB0, ch->chunk_type);
4574 #endif
4575
4576                 /* check to see if this chunk required auth, but isn't */
4577                 if ((stcb != NULL) &&
4578                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4579                     !stcb->asoc.authenticated) {
4580                         /* "silently" ignore */
4581                         SCTP_STAT_INCR(sctps_recvauthmissing);
4582                         goto next_chunk;
4583                 }
4584                 switch (ch->chunk_type) {
4585                 case SCTP_INITIATION:
4586                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4587                         /* The INIT chunk must be the only chunk. */
4588                         if ((num_chunks > 1) ||
4589                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4590                                 /* RFC 4960 requires that no ABORT is sent */
4591                                 *offset = length;
4592                                 if (stcb != NULL) {
4593                                         SCTP_TCB_UNLOCK(stcb);
4594                                 }
4595                                 return (NULL);
4596                         }
4597                         /* Honor our resource limit. */
4598                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4599                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4600                                 sctp_abort_association(inp, stcb, m, iphlen,
4601                                     src, dst, sh, op_err,
4602                                     mflowtype, mflowid,
4603                                     vrf_id, port);
4604                                 *offset = length;
4605                                 return (NULL);
4606                         }
4607                         sctp_handle_init(m, iphlen, *offset, src, dst, sh,
4608                             (struct sctp_init_chunk *)ch, inp,
4609                             stcb, *netp, &abort_no_unlock,
4610                             mflowtype, mflowid,
4611                             vrf_id, port);
4612                         *offset = length;
4613                         if ((!abort_no_unlock) && (stcb != NULL)) {
4614                                 SCTP_TCB_UNLOCK(stcb);
4615                         }
4616                         return (NULL);
4617                         break;
4618                 case SCTP_PAD_CHUNK:
4619                         break;
4620                 case SCTP_INITIATION_ACK:
4621                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n");
4622                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4623                                 /* We are not interested anymore */
4624                                 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) {
4625                                         ;
4626                                 } else {
4627                                         *offset = length;
4628                                         if (stcb != NULL) {
4629                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
4630                                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
4631                                         }
4632                                         return (NULL);
4633                                 }
4634                         }
4635                         /* The INIT-ACK chunk must be the only chunk. */
4636                         if ((num_chunks > 1) ||
4637                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4638                                 *offset = length;
4639                                 return (stcb);
4640                         }
4641                         if ((netp != NULL) && (*netp != NULL)) {
4642                                 ret = sctp_handle_init_ack(m, iphlen, *offset,
4643                                     src, dst, sh,
4644                                     (struct sctp_init_ack_chunk *)ch,
4645                                     stcb, *netp,
4646                                     &abort_no_unlock,
4647                                     mflowtype, mflowid,
4648                                     vrf_id);
4649                         } else {
4650                                 ret = -1;
4651                         }
4652                         *offset = length;
4653                         if (abort_no_unlock) {
4654                                 return (NULL);
4655                         }
4656                         /*
4657                          * Special case, I must call the output routine to
4658                          * get the cookie echoed
4659                          */
4660                         if ((stcb != NULL) && (ret == 0)) {
4661                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4662                         }
4663                         return (stcb);
4664                         break;
4665                 case SCTP_SELECTIVE_ACK:
4666                 case SCTP_NR_SELECTIVE_ACK:
4667                         {
4668                                 int abort_now = 0;
4669                                 uint32_t a_rwnd, cum_ack;
4670                                 uint16_t num_seg, num_nr_seg, num_dup;
4671                                 uint8_t flags;
4672                                 int offset_seg, offset_dup;
4673
4674                                 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n",
4675                                     ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK");
4676                                 SCTP_STAT_INCR(sctps_recvsacks);
4677                                 if (stcb == NULL) {
4678                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n",
4679                                             (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK");
4680                                         break;
4681                                 }
4682                                 if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
4683                                         if (chk_length < sizeof(struct sctp_sack_chunk)) {
4684                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4685                                                 break;
4686                                         }
4687                                 } else {
4688                                         if (stcb->asoc.nrsack_supported == 0) {
4689                                                 goto unknown_chunk;
4690                                         }
4691                                         if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
4692                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n");
4693                                                 break;
4694                                         }
4695                                 }
4696                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4697                                         /*-
4698                                          * If we have sent a shutdown-ack, we will pay no
4699                                          * attention to a sack sent in to us since
4700                                          * we don't care anymore.
4701                                          */
4702                                         break;
4703                                 }
4704                                 flags = ch->chunk_flags;
4705                                 if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
4706                                         struct sctp_sack_chunk *sack;
4707
4708                                         sack = (struct sctp_sack_chunk *)ch;
4709                                         cum_ack = ntohl(sack->sack.cum_tsn_ack);
4710                                         num_seg = ntohs(sack->sack.num_gap_ack_blks);
4711                                         num_nr_seg = 0;
4712                                         num_dup = ntohs(sack->sack.num_dup_tsns);
4713                                         a_rwnd = ntohl(sack->sack.a_rwnd);
4714                                         if (sizeof(struct sctp_sack_chunk) +
4715                                             num_seg * sizeof(struct sctp_gap_ack_block) +
4716                                             num_dup * sizeof(uint32_t) != chk_length) {
4717                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4718                                                 break;
4719                                         }
4720                                         offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4721                                         offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4722                                 } else {
4723                                         struct sctp_nr_sack_chunk *nr_sack;
4724
4725                                         nr_sack = (struct sctp_nr_sack_chunk *)ch;
4726                                         cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
4727                                         num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
4728                                         num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
4729                                         num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
4730                                         a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd);
4731                                         if (sizeof(struct sctp_nr_sack_chunk) +
4732                                             (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
4733                                             num_dup * sizeof(uint32_t) != chk_length) {
4734                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
4735                                                 break;
4736                                         }
4737                                         offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
4738                                         offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block);
4739                                 }
4740                                 SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4741                                     (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK",
4742                                     cum_ack, num_seg, a_rwnd);
4743                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4744                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4745                                     (num_seg == 0) && (num_nr_seg == 0) &&
4746                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4747                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4748                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4749                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
4750                                         /*
4751                                          * We have a SIMPLE sack having no
4752                                          * prior segments and data on sent
4753                                          * queue to be acked. Use the faster
4754                                          * path sack processing. We also
4755                                          * allow window update sacks with no
4756                                          * missing segments to go this way
4757                                          * too.
4758                                          */
4759                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
4760                                             &abort_now, ecne_seen);
4761                                 } else {
4762                                         if ((netp != NULL) && (*netp != NULL)) {
4763                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4764                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
4765                                                     cum_ack, a_rwnd, ecne_seen);
4766                                         }
4767                                 }
4768                                 if (abort_now) {
4769                                         /* ABORT signal from sack processing */
4770                                         *offset = length;
4771                                         return (NULL);
4772                                 }
4773                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4774                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4775                                     (stcb->asoc.stream_queue_cnt == 0)) {
4776                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4777                                 }
4778                                 break;
4779                         }
4780                 case SCTP_HEARTBEAT_REQUEST:
4781                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
4782                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
4783                                 SCTP_STAT_INCR(sctps_recvheartbeat);
4784                                 sctp_send_heartbeat_ack(stcb, m, *offset,
4785                                     chk_length, *netp);
4786                         }
4787                         break;
4788                 case SCTP_HEARTBEAT_ACK:
4789                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n");
4790                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
4791                                 /* Its not ours */
4792                                 *offset = length;
4793                                 return (stcb);
4794                         }
4795                         SCTP_STAT_INCR(sctps_recvheartbeatack);
4796                         if ((netp != NULL) && (*netp != NULL)) {
4797                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
4798                                     stcb, *netp);
4799                         }
4800                         break;
4801                 case SCTP_ABORT_ASSOCIATION:
4802                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
4803                             (void *)stcb);
4804                         *offset = length;
4805                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
4806                                 if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) {
4807                                         return (NULL);
4808                                 } else {
4809                                         return (stcb);
4810                                 }
4811                         } else {
4812                                 return (NULL);
4813                         }
4814                         break;
4815                 case SCTP_SHUTDOWN:
4816                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
4817                             (void *)stcb);
4818                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
4819                                 *offset = length;
4820                                 return (stcb);
4821                         }
4822                         if ((netp != NULL) && (*netp != NULL)) {
4823                                 int abort_flag = 0;
4824
4825                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
4826                                     stcb, *netp, &abort_flag);
4827                                 if (abort_flag) {
4828                                         *offset = length;
4829                                         return (NULL);
4830                                 }
4831                         }
4832                         break;
4833                 case SCTP_SHUTDOWN_ACK:
4834                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb);
4835                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
4836                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
4837                         }
4838                         *offset = length;
4839                         return (NULL);
4840                         break;
4841                 case SCTP_OPERATION_ERROR:
4842                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n");
4843                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) &&
4844                             sctp_handle_error(ch, stcb, *netp, contiguous) < 0) {
4845                                 *offset = length;
4846                                 return (NULL);
4847                         }
4848                         break;
4849                 case SCTP_COOKIE_ECHO:
4850                         SCTPDBG(SCTP_DEBUG_INPUT3,
4851                             "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb);
4852                         if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) {
4853                                 ;
4854                         } else {
4855                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4856                                         /* We are not interested anymore */
4857                         abend:
4858                                         if (stcb != NULL) {
4859                                                 SCTP_TCB_UNLOCK(stcb);
4860                                         }
4861                                         *offset = length;
4862                                         return (NULL);
4863                                 }
4864                         }
4865                         /*-
4866                          * First are we accepting? We do this again here
4867                          * since it is possible that a previous endpoint WAS
4868                          * listening responded to a INIT-ACK and then
4869                          * closed. We opened and bound.. and are now no
4870                          * longer listening.
4871                          *
4872                          * XXXGL: notes on checking listen queue length.
4873                          * 1) SCTP_IS_LISTENING() doesn't necessarily mean
4874                          *    SOLISTENING(), because a listening "UDP type"
4875                          *    socket isn't listening in terms of the socket
4876                          *    layer.  It is a normal data flow socket, that
4877                          *    can fork off new connections.  Thus, we should
4878                          *    look into sol_qlen only in case we are !UDP.
4879                          * 2) Checking sol_qlen in general requires locking
4880                          *    the socket, and this code lacks that.
4881                          */
4882                         if ((stcb == NULL) &&
4883                             (!SCTP_IS_LISTENING(inp) ||
4884                             (!(inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) &&
4885                             inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) {
4886                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
4887                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
4888                                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4889                                         sctp_abort_association(inp, stcb, m, iphlen,
4890                                             src, dst, sh, op_err,
4891                                             mflowtype, mflowid,
4892                                             vrf_id, port);
4893                                 }
4894                                 *offset = length;
4895                                 return (NULL);
4896                         } else {
4897                                 struct mbuf *ret_buf;
4898                                 struct sctp_inpcb *linp;
4899                                 struct sctp_tmit_chunk *chk;
4900
4901                                 if (stcb) {
4902                                         linp = NULL;
4903                                 } else {
4904                                         linp = inp;
4905                                 }
4906
4907                                 if (linp != NULL) {
4908                                         SCTP_ASOC_CREATE_LOCK(linp);
4909                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
4910                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
4911                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
4912                                                 goto abend;
4913                                         }
4914                                 }
4915
4916                                 if (netp != NULL) {
4917                                         struct sctp_tcb *locked_stcb;
4918
4919                                         locked_stcb = stcb;
4920                                         ret_buf =
4921                                             sctp_handle_cookie_echo(m, iphlen,
4922                                             *offset,
4923                                             src, dst,
4924                                             sh,
4925                                             (struct sctp_cookie_echo_chunk *)ch,
4926                                             &inp, &stcb, netp,
4927                                             auth_skipped,
4928                                             auth_offset,
4929                                             auth_len,
4930                                             &locked_stcb,
4931                                             mflowtype,
4932                                             mflowid,
4933                                             vrf_id,
4934                                             port);
4935                                         if ((locked_stcb != NULL) && (locked_stcb != stcb)) {
4936                                                 SCTP_TCB_UNLOCK(locked_stcb);
4937                                         }
4938                                         if (stcb != NULL) {
4939                                                 SCTP_TCB_LOCK_ASSERT(stcb);
4940                                         }
4941                                 } else {
4942                                         ret_buf = NULL;
4943                                 }
4944                                 if (linp != NULL) {
4945                                         SCTP_ASOC_CREATE_UNLOCK(linp);
4946                                 }
4947                                 if (ret_buf == NULL) {
4948                                         if (stcb != NULL) {
4949                                                 SCTP_TCB_UNLOCK(stcb);
4950                                         }
4951                                         SCTPDBG(SCTP_DEBUG_INPUT3,
4952                                             "GAK, null buffer\n");
4953                                         *offset = length;
4954                                         return (NULL);
4955                                 }
4956                                 /* if AUTH skipped, see if it verified... */
4957                                 if (auth_skipped) {
4958                                         got_auth = 1;
4959                                         auth_skipped = 0;
4960                                 }
4961                                 /* Restart the timer if we have pending data */
4962                                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
4963                                         if (chk->whoTo != NULL) {
4964                                                 break;
4965                                         }
4966                                 }
4967                                 if (chk != NULL) {
4968                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
4969                                 }
4970                         }
4971                         break;
4972                 case SCTP_COOKIE_ACK:
4973                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb);
4974                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
4975                                 return (stcb);
4976                         }
4977                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4978                                 /* We are not interested anymore */
4979                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4980                                         ;
4981                                 } else if (stcb) {
4982                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
4983                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
4984                                         *offset = length;
4985                                         return (NULL);
4986                                 }
4987                         }
4988                         if ((netp != NULL) && (*netp != NULL)) {
4989                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
4990                         }
4991                         break;
4992                 case SCTP_ECN_ECHO:
4993                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n");
4994                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
4995                                 /* Its not ours */
4996                                 *offset = length;
4997                                 return (stcb);
4998                         }
4999                         if (stcb->asoc.ecn_supported == 0) {
5000                                 goto unknown_chunk;
5001                         }
5002                         sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb);
5003                         ecne_seen = 1;
5004                         break;
5005                 case SCTP_ECN_CWR:
5006                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n");
5007                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5008                                 *offset = length;
5009                                 return (stcb);
5010                         }
5011                         if (stcb->asoc.ecn_supported == 0) {
5012                                 goto unknown_chunk;
5013                         }
5014                         sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5015                         break;
5016                 case SCTP_SHUTDOWN_COMPLETE:
5017                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb);
5018                         /* must be first and only chunk */
5019                         if ((num_chunks > 1) ||
5020                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5021                                 *offset = length;
5022                                 return (stcb);
5023                         }
5024                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5025                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5026                                     stcb, *netp);
5027                         }
5028                         *offset = length;
5029                         return (NULL);
5030                         break;
5031                 case SCTP_ASCONF:
5032                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5033                         if (stcb != NULL) {
5034                                 if (stcb->asoc.asconf_supported == 0) {
5035                                         goto unknown_chunk;
5036                                 }
5037                                 sctp_handle_asconf(m, *offset, src,
5038                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5039                                 asconf_cnt++;
5040                         }
5041                         break;
5042                 case SCTP_ASCONF_ACK:
5043                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n");
5044                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5045                                 /* Its not ours */
5046                                 *offset = length;
5047                                 return (stcb);
5048                         }
5049                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5050                                 if (stcb->asoc.asconf_supported == 0) {
5051                                         goto unknown_chunk;
5052                                 }
5053                                 /* He's alive so give him credit */
5054                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5055                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5056                                             stcb->asoc.overall_error_count,
5057                                             0,
5058                                             SCTP_FROM_SCTP_INPUT,
5059                                             __LINE__);
5060                                 }
5061                                 stcb->asoc.overall_error_count = 0;
5062                                 sctp_handle_asconf_ack(m, *offset,
5063                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5064                                 if (abort_no_unlock)
5065                                         return (NULL);
5066                         }
5067                         break;
5068                 case SCTP_FORWARD_CUM_TSN:
5069                 case SCTP_IFORWARD_CUM_TSN:
5070                         SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n",
5071                             ch->chunk_type == SCTP_FORWARD_CUM_TSN ? "FORWARD_TSN" : "I_FORWARD_TSN");
5072                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5073                                 /* Its not ours */
5074                                 *offset = length;
5075                                 return (stcb);
5076                         }
5077
5078                         if (stcb != NULL) {
5079                                 int abort_flag = 0;
5080
5081                                 if (stcb->asoc.prsctp_supported == 0) {
5082                                         goto unknown_chunk;
5083                                 }
5084                                 if (((stcb->asoc.idata_supported == 1) && (ch->chunk_type == SCTP_FORWARD_CUM_TSN)) ||
5085                                     ((stcb->asoc.idata_supported == 0) && (ch->chunk_type == SCTP_IFORWARD_CUM_TSN))) {
5086                                         if (ch->chunk_type == SCTP_FORWARD_CUM_TSN) {
5087                                                 SCTP_SNPRINTF(msg, sizeof(msg), "%s", "FORWARD-TSN chunk received when I-FORWARD-TSN was negotiated");
5088                                         } else {
5089                                                 SCTP_SNPRINTF(msg, sizeof(msg), "%s", "I-FORWARD-TSN chunk received when FORWARD-TSN was negotiated");
5090                                         }
5091                                         op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
5092                                         sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
5093                                         *offset = length;
5094                                         return (NULL);
5095                                 }
5096                                 *fwd_tsn_seen = 1;
5097                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5098                                         /* We are not interested anymore */
5099                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5100                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_31);
5101                                         *offset = length;
5102                                         return (NULL);
5103                                 }
5104                                 /*
5105                                  * For sending a SACK this looks like DATA
5106                                  * chunks.
5107                                  */
5108                                 stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from;
5109                                 sctp_handle_forward_tsn(stcb,
5110                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5111                                 if (abort_flag) {
5112                                         *offset = length;
5113                                         return (NULL);
5114                                 }
5115                         }
5116                         break;
5117                 case SCTP_STREAM_RESET:
5118                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5119                         if ((stcb == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req))) {
5120                                 /* Its not ours */
5121                                 *offset = length;
5122                                 return (stcb);
5123                         }
5124                         if (stcb->asoc.reconfig_supported == 0) {
5125                                 goto unknown_chunk;
5126                         }
5127                         if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5128                                 /* stop processing */
5129                                 *offset = length;
5130                                 return (NULL);
5131                         }
5132                         break;
5133                 case SCTP_PACKET_DROPPED:
5134                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5135                         /* re-get it all please */
5136                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5137                                 /* Its not ours */
5138                                 *offset = length;
5139                                 return (stcb);
5140                         }
5141
5142                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5143                                 if (stcb->asoc.pktdrop_supported == 0) {
5144                                         goto unknown_chunk;
5145                                 }
5146                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5147                                     stcb, *netp,
5148                                     min(chk_length, contiguous));
5149                         }
5150                         break;
5151                 case SCTP_AUTHENTICATION:
5152                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5153                         if (stcb == NULL) {
5154                                 /* save the first AUTH for later processing */
5155                                 if (auth_skipped == 0) {
5156                                         auth_offset = *offset;
5157                                         auth_len = chk_length;
5158                                         auth_skipped = 1;
5159                                 }
5160                                 /* skip this chunk (temporarily) */
5161                                 goto next_chunk;
5162                         }
5163                         if (stcb->asoc.auth_supported == 0) {
5164                                 goto unknown_chunk;
5165                         }
5166                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5167                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5168                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5169                                 /* Its not ours */
5170                                 *offset = length;
5171                                 return (stcb);
5172                         }
5173                         if (got_auth == 1) {
5174                                 /* skip this chunk... it's already auth'd */
5175                                 goto next_chunk;
5176                         }
5177                         got_auth = 1;
5178                         if (sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, m, *offset)) {
5179                                 /* auth HMAC failed so dump the packet */
5180                                 *offset = length;
5181                                 return (stcb);
5182                         } else {
5183                                 /* remaining chunks are HMAC checked */
5184                                 stcb->asoc.authenticated = 1;
5185                         }
5186                         break;
5187
5188                 default:
5189         unknown_chunk:
5190                         /* it's an unknown chunk! */
5191                         if ((ch->chunk_type & 0x40) &&
5192                             (stcb != NULL) &&
5193                             (SCTP_GET_STATE(stcb) != SCTP_STATE_EMPTY) &&
5194                             (SCTP_GET_STATE(stcb) != SCTP_STATE_INUSE) &&
5195                             (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) {
5196                                 struct sctp_gen_error_cause *cause;
5197                                 int len;
5198
5199                                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause),
5200                                     0, M_NOWAIT, 1, MT_DATA);
5201                                 if (op_err != NULL) {
5202                                         len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset));
5203                                         cause = mtod(op_err, struct sctp_gen_error_cause *);
5204                                         cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5205                                         cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause)));
5206                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5207                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
5208                                         if (SCTP_BUF_NEXT(op_err) != NULL) {
5209 #ifdef SCTP_MBUF_LOGGING
5210                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5211                                                         sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY);
5212                                                 }
5213 #endif
5214                                                 sctp_queue_op_err(stcb, op_err);
5215                                         } else {
5216                                                 sctp_m_freem(op_err);
5217                                         }
5218                                 }
5219                         }
5220                         if ((ch->chunk_type & 0x80) == 0) {
5221                                 /* discard this packet */
5222                                 *offset = length;
5223                                 return (stcb);
5224                         }       /* else skip this bad chunk and continue... */
5225                         break;
5226                 }               /* switch (ch->chunk_type) */
5227
5228 next_chunk:
5229                 /* get the next chunk */
5230                 *offset += SCTP_SIZE32(chk_length);
5231                 if (*offset >= length) {
5232                         /* no more data left in the mbuf chain */
5233                         break;
5234                 }
5235                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5236                     sizeof(struct sctp_chunkhdr), chunk_buf);
5237                 if (ch == NULL) {
5238                         *offset = length;
5239                         return (stcb);
5240                 }
5241         }                       /* while */
5242
5243         if ((asconf_cnt > 0) && (stcb != NULL)) {
5244                 sctp_send_asconf_ack(stcb);
5245         }
5246         return (stcb);
5247 }
5248
5249 /*
5250  * common input chunk processing (v4 and v6)
5251  */
5252 void
5253 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5254     struct sockaddr *src, struct sockaddr *dst,
5255     struct sctphdr *sh, struct sctp_chunkhdr *ch,
5256     uint8_t compute_crc,
5257     uint8_t ecn_bits,
5258     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
5259     uint32_t vrf_id, uint16_t port)
5260 {
5261         uint32_t high_tsn;
5262         int fwd_tsn_seen = 0, data_processed = 0;
5263         struct mbuf *m = *mm, *op_err;
5264         char msg[SCTP_DIAG_INFO_LEN];
5265         int un_sent;
5266         int cnt_ctrl_ready = 0;
5267         struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5268         struct sctp_tcb *stcb = NULL;
5269         struct sctp_nets *net = NULL;
5270
5271         SCTP_STAT_INCR(sctps_recvdatagrams);
5272 #ifdef SCTP_AUDITING_ENABLED
5273         sctp_audit_log(0xE0, 1);
5274         sctp_auditing(0, inp, stcb, net);
5275 #endif
5276         if (compute_crc != 0) {
5277                 uint32_t check, calc_check;
5278
5279                 check = sh->checksum;
5280                 sh->checksum = 0;
5281                 calc_check = sctp_calculate_cksum(m, iphlen);
5282                 sh->checksum = check;
5283                 if (calc_check != check) {
5284                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5285                             calc_check, check, (void *)m, length, iphlen);
5286                         stcb = sctp_findassociation_addr(m, offset, src, dst,
5287                             sh, ch, &inp, &net, vrf_id);
5288 #if defined(INET) || defined(INET6)
5289                         if ((ch->chunk_type != SCTP_INITIATION) &&
5290                             (net != NULL) && (net->port != port)) {
5291                                 if (net->port == 0) {
5292                                         /* UDP encapsulation turned on. */
5293                                         net->mtu -= sizeof(struct udphdr);
5294                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5295                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5296                                         }
5297                                 } else if (port == 0) {
5298                                         /* UDP encapsulation turned off. */
5299                                         net->mtu += sizeof(struct udphdr);
5300                                         /* XXX Update smallest_mtu */
5301                                 }
5302                                 net->port = port;
5303                         }
5304 #endif
5305                         if (net != NULL) {
5306                                 net->flowtype = mflowtype;
5307                                 net->flowid = mflowid;
5308                         }
5309                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5310                         if ((inp != NULL) && (stcb != NULL)) {
5311                                 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5312                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5313                         } else if ((inp != NULL) && (stcb == NULL)) {
5314                                 inp_decr = inp;
5315                         }
5316                         SCTP_STAT_INCR(sctps_badsum);
5317                         SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5318                         goto out;
5319                 }
5320         }
5321         /* Destination port of 0 is illegal, based on RFC4960. */
5322         if (sh->dest_port == 0) {
5323                 SCTP_STAT_INCR(sctps_hdrops);
5324                 goto out;
5325         }
5326         stcb = sctp_findassociation_addr(m, offset, src, dst,
5327             sh, ch, &inp, &net, vrf_id);
5328 #if defined(INET) || defined(INET6)
5329         if ((ch->chunk_type != SCTP_INITIATION) &&
5330             (net != NULL) && (net->port != port)) {
5331                 if (net->port == 0) {
5332                         /* UDP encapsulation turned on. */
5333                         net->mtu -= sizeof(struct udphdr);
5334                         if (stcb->asoc.smallest_mtu > net->mtu) {
5335                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5336                         }
5337                 } else if (port == 0) {
5338                         /* UDP encapsulation turned off. */
5339                         net->mtu += sizeof(struct udphdr);
5340                         /* XXX Update smallest_mtu */
5341                 }
5342                 net->port = port;
5343         }
5344 #endif
5345         if (net != NULL) {
5346                 net->flowtype = mflowtype;
5347                 net->flowid = mflowid;
5348         }
5349         if (inp == NULL) {
5350                 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5351                 SCTP_STAT_INCR(sctps_noport);
5352                 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5353                         goto out;
5354                 }
5355                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5356                         sctp_send_shutdown_complete2(src, dst, sh,
5357                             mflowtype, mflowid, fibnum,
5358                             vrf_id, port);
5359                         goto out;
5360                 }
5361                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5362                         goto out;
5363                 }
5364                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5365                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5366                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5367                             (ch->chunk_type != SCTP_INIT))) {
5368                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5369                                     "Out of the blue");
5370                                 sctp_send_abort(m, iphlen, src, dst,
5371                                     sh, 0, op_err,
5372                                     mflowtype, mflowid, fibnum,
5373                                     vrf_id, port);
5374                         }
5375                 }
5376                 goto out;
5377         } else if (stcb == NULL) {
5378                 inp_decr = inp;
5379         }
5380         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5381             (void *)m, iphlen, offset, length, (void *)stcb);
5382         if (stcb) {
5383                 /* always clear this before beginning a packet */
5384                 stcb->asoc.authenticated = 0;
5385                 stcb->asoc.seen_a_sack_this_pkt = 0;
5386                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5387                     (void *)stcb, stcb->asoc.state);
5388
5389                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5390                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5391                         /*-
5392                          * If we hit here, we had a ref count
5393                          * up when the assoc was aborted and the
5394                          * timer is clearing out the assoc, we should
5395                          * NOT respond to any packet.. its OOTB.
5396                          */
5397                         SCTP_TCB_UNLOCK(stcb);
5398                         stcb = NULL;
5399                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5400                         SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5401                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5402                             msg);
5403                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5404                             mflowtype, mflowid, inp->fibnum,
5405                             vrf_id, port);
5406                         goto out;
5407                 }
5408         }
5409         if (IS_SCTP_CONTROL(ch)) {
5410                 /* process the control portion of the SCTP packet */
5411                 /* sa_ignore NO_NULL_CHK */
5412                 stcb = sctp_process_control(m, iphlen, &offset, length,
5413                     src, dst, sh, ch,
5414                     inp, stcb, &net, &fwd_tsn_seen,
5415                     mflowtype, mflowid, fibnum,
5416                     vrf_id, port);
5417                 if (stcb) {
5418                         /*
5419                          * This covers us if the cookie-echo was there and
5420                          * it changes our INP.
5421                          */
5422                         inp = stcb->sctp_ep;
5423 #if defined(INET) || defined(INET6)
5424                         if ((ch->chunk_type != SCTP_INITIATION) &&
5425                             (net != NULL) && (net->port != port)) {
5426                                 if (net->port == 0) {
5427                                         /* UDP encapsulation turned on. */
5428                                         net->mtu -= sizeof(struct udphdr);
5429                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5430                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5431                                         }
5432                                 } else if (port == 0) {
5433                                         /* UDP encapsulation turned off. */
5434                                         net->mtu += sizeof(struct udphdr);
5435                                         /* XXX Update smallest_mtu */
5436                                 }
5437                                 net->port = port;
5438                         }
5439 #endif
5440                 }
5441         } else {
5442                 /*
5443                  * no control chunks, so pre-process DATA chunks (these
5444                  * checks are taken care of by control processing)
5445                  */
5446
5447                 /*
5448                  * if DATA only packet, and auth is required, then punt...
5449                  * can't have authenticated without any AUTH (control)
5450                  * chunks
5451                  */
5452                 if ((stcb != NULL) &&
5453                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5454                         /* "silently" ignore */
5455                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5456                         SCTP_STAT_INCR(sctps_recvauthmissing);
5457                         goto out;
5458                 }
5459                 if (stcb == NULL) {
5460                         /* out of the blue DATA chunk */
5461                         SCTP_PROBE5(receive, NULL, NULL, m, NULL, sh);
5462                         SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5463                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5464                             msg);
5465                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5466                             mflowtype, mflowid, fibnum,
5467                             vrf_id, port);
5468                         goto out;
5469                 }
5470                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5471                         /* v_tag mismatch! */
5472                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5473                         SCTP_STAT_INCR(sctps_badvtag);
5474                         goto out;
5475                 }
5476         }
5477
5478         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5479         if (stcb == NULL) {
5480                 /*
5481                  * no valid TCB for this packet, or we found it's a bad
5482                  * packet while processing control, or we're done with this
5483                  * packet (done or skip rest of data), so we drop it...
5484                  */
5485                 goto out;
5486         }
5487
5488         /*
5489          * DATA chunk processing
5490          */
5491         /* plow through the data chunks while length > offset */
5492
5493         /*
5494          * Rest should be DATA only.  Check authentication state if AUTH for
5495          * DATA is required.
5496          */
5497         if ((length > offset) &&
5498             (stcb != NULL) &&
5499             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5500             !stcb->asoc.authenticated) {
5501                 /* "silently" ignore */
5502                 SCTP_STAT_INCR(sctps_recvauthmissing);
5503                 SCTPDBG(SCTP_DEBUG_AUTH1,
5504                     "Data chunk requires AUTH, skipped\n");
5505                 goto trigger_send;
5506         }
5507         if (length > offset) {
5508                 int retval;
5509
5510                 /*
5511                  * First check to make sure our state is correct. We would
5512                  * not get here unless we really did have a tag, so we don't
5513                  * abort if this happens, just dump the chunk silently.
5514                  */
5515                 switch (SCTP_GET_STATE(stcb)) {
5516                 case SCTP_STATE_COOKIE_ECHOED:
5517                         /*
5518                          * we consider data with valid tags in this state
5519                          * shows us the cookie-ack was lost. Imply it was
5520                          * there.
5521                          */
5522                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5523                         break;
5524                 case SCTP_STATE_COOKIE_WAIT:
5525                         /*
5526                          * We consider OOTB any data sent during asoc setup.
5527                          */
5528                         SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5529                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5530                             msg);
5531                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5532                             mflowtype, mflowid, inp->fibnum,
5533                             vrf_id, port);
5534                         goto out;
5535                         /* sa_ignore NOTREACHED */
5536                         break;
5537                 case SCTP_STATE_EMPTY:  /* should not happen */
5538                 case SCTP_STATE_INUSE:  /* should not happen */
5539                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5540                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5541                 default:
5542                         goto out;
5543                         /* sa_ignore NOTREACHED */
5544                         break;
5545                 case SCTP_STATE_OPEN:
5546                 case SCTP_STATE_SHUTDOWN_SENT:
5547                         break;
5548                 }
5549                 /* plow through the data chunks while length > offset */
5550                 retval = sctp_process_data(mm, iphlen, &offset, length,
5551                     inp, stcb, net, &high_tsn);
5552                 if (retval == 2) {
5553                         /*
5554                          * The association aborted, NO UNLOCK needed since
5555                          * the association is destroyed.
5556                          */
5557                         stcb = NULL;
5558                         goto out;
5559                 }
5560                 data_processed = 1;
5561                 /*
5562                  * Anything important needs to have been m_copy'ed in
5563                  * process_data
5564                  */
5565         }
5566
5567         /* take care of ecn */
5568         if ((data_processed == 1) &&
5569             (stcb->asoc.ecn_supported == 1) &&
5570             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5571                 /* Yep, we need to add a ECNE */
5572                 sctp_send_ecn_echo(stcb, net, high_tsn);
5573         }
5574
5575         if ((data_processed == 0) && (fwd_tsn_seen)) {
5576                 int was_a_gap;
5577                 uint32_t highest_tsn;
5578
5579                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
5580                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
5581                 } else {
5582                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
5583                 }
5584                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
5585                 stcb->asoc.send_sack = 1;
5586                 sctp_sack_check(stcb, was_a_gap);
5587         } else if (fwd_tsn_seen) {
5588                 stcb->asoc.send_sack = 1;
5589         }
5590         /* trigger send of any chunks in queue... */
5591 trigger_send:
5592 #ifdef SCTP_AUDITING_ENABLED
5593         sctp_audit_log(0xE0, 2);
5594         sctp_auditing(1, inp, stcb, net);
5595 #endif
5596         SCTPDBG(SCTP_DEBUG_INPUT1,
5597             "Check for chunk output prw:%d tqe:%d tf=%d\n",
5598             stcb->asoc.peers_rwnd,
5599             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
5600             stcb->asoc.total_flight);
5601         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
5602         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
5603                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
5604         }
5605         if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) ||
5606             cnt_ctrl_ready ||
5607             stcb->asoc.trigger_reset ||
5608             ((un_sent > 0) &&
5609             (stcb->asoc.peers_rwnd > 0 || stcb->asoc.total_flight == 0))) {
5610                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
5611                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5612                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
5613         }
5614 #ifdef SCTP_AUDITING_ENABLED
5615         sctp_audit_log(0xE0, 3);
5616         sctp_auditing(2, inp, stcb, net);
5617 #endif
5618 out:
5619         if (stcb != NULL) {
5620                 SCTP_TCB_UNLOCK(stcb);
5621         }
5622         if (inp_decr != NULL) {
5623                 /* reduce ref-count */
5624                 SCTP_INP_WLOCK(inp_decr);
5625                 SCTP_INP_DECR_REF(inp_decr);
5626                 SCTP_INP_WUNLOCK(inp_decr);
5627         }
5628         return;
5629 }
5630
5631 #ifdef INET
5632 void
5633 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
5634 {
5635         struct mbuf *m;
5636         int iphlen;
5637         uint32_t vrf_id = 0;
5638         uint8_t ecn_bits;
5639         struct sockaddr_in src, dst;
5640         struct ip *ip;
5641         struct sctphdr *sh;
5642         struct sctp_chunkhdr *ch;
5643         int length, offset;
5644         uint8_t compute_crc;
5645         uint32_t mflowid;
5646         uint8_t mflowtype;
5647         uint16_t fibnum;
5648
5649         iphlen = off;
5650         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
5651                 SCTP_RELEASE_PKT(i_pak);
5652                 return;
5653         }
5654         m = SCTP_HEADER_TO_CHAIN(i_pak);
5655 #ifdef SCTP_MBUF_LOGGING
5656         /* Log in any input mbufs */
5657         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5658                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
5659         }
5660 #endif
5661 #ifdef SCTP_PACKET_LOGGING
5662         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
5663                 sctp_packet_log(m);
5664         }
5665 #endif
5666         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
5667             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
5668             m->m_pkthdr.len,
5669             if_name(m->m_pkthdr.rcvif),
5670             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
5671         mflowid = m->m_pkthdr.flowid;
5672         mflowtype = M_HASHTYPE_GET(m);
5673         fibnum = M_GETFIB(m);
5674         SCTP_STAT_INCR(sctps_recvpackets);
5675         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
5676         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
5677         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5678         if (SCTP_BUF_LEN(m) < offset) {
5679                 if ((m = m_pullup(m, offset)) == NULL) {
5680                         SCTP_STAT_INCR(sctps_hdrops);
5681                         return;
5682                 }
5683         }
5684         ip = mtod(m, struct ip *);
5685         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
5686         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
5687         offset -= sizeof(struct sctp_chunkhdr);
5688         memset(&src, 0, sizeof(struct sockaddr_in));
5689         src.sin_family = AF_INET;
5690         src.sin_len = sizeof(struct sockaddr_in);
5691         src.sin_port = sh->src_port;
5692         src.sin_addr = ip->ip_src;
5693         memset(&dst, 0, sizeof(struct sockaddr_in));
5694         dst.sin_family = AF_INET;
5695         dst.sin_len = sizeof(struct sockaddr_in);
5696         dst.sin_port = sh->dest_port;
5697         dst.sin_addr = ip->ip_dst;
5698         length = ntohs(ip->ip_len);
5699         /* Validate mbuf chain length with IP payload length. */
5700         if (SCTP_HEADER_LEN(m) != length) {
5701                 SCTPDBG(SCTP_DEBUG_INPUT1,
5702                     "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
5703                 SCTP_STAT_INCR(sctps_hdrops);
5704                 goto out;
5705         }
5706         /* SCTP does not allow broadcasts or multicasts */
5707         if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
5708                 goto out;
5709         }
5710         if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
5711                 goto out;
5712         }
5713         ecn_bits = ip->ip_tos;
5714         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
5715                 SCTP_STAT_INCR(sctps_recvhwcrc);
5716                 compute_crc = 0;
5717         } else {
5718                 SCTP_STAT_INCR(sctps_recvswcrc);
5719                 compute_crc = 1;
5720         }
5721         sctp_common_input_processing(&m, iphlen, offset, length,
5722             (struct sockaddr *)&src,
5723             (struct sockaddr *)&dst,
5724             sh, ch,
5725             compute_crc,
5726             ecn_bits,
5727             mflowtype, mflowid, fibnum,
5728             vrf_id, port);
5729 out:
5730         if (m) {
5731                 sctp_m_freem(m);
5732         }
5733         return;
5734 }
5735
5736 #if defined(SCTP_MCORE_INPUT) && defined(SMP)
5737 extern int *sctp_cpuarry;
5738 #endif
5739
5740 int
5741 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED)
5742 {
5743         struct mbuf *m;
5744         int off;
5745
5746         m = *mp;
5747         off = *offp;
5748 #if defined(SCTP_MCORE_INPUT) && defined(SMP)
5749         if (mp_ncpus > 1) {
5750                 struct ip *ip;
5751                 struct sctphdr *sh;
5752                 int offset;
5753                 int cpu_to_use;
5754                 uint32_t flowid, tag;
5755
5756                 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
5757                         flowid = m->m_pkthdr.flowid;
5758                 } else {
5759                         /*
5760                          * No flow id built by lower layers fix it so we
5761                          * create one.
5762                          */
5763                         offset = off + sizeof(struct sctphdr);
5764                         if (SCTP_BUF_LEN(m) < offset) {
5765                                 if ((m = m_pullup(m, offset)) == NULL) {
5766                                         SCTP_STAT_INCR(sctps_hdrops);
5767                                         return (IPPROTO_DONE);
5768                                 }
5769                         }
5770                         ip = mtod(m, struct ip *);
5771                         sh = (struct sctphdr *)((caddr_t)ip + off);
5772                         tag = htonl(sh->v_tag);
5773                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
5774                         m->m_pkthdr.flowid = flowid;
5775                         M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH);
5776                 }
5777                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
5778                 sctp_queue_to_mcore(m, off, cpu_to_use);
5779                 return (IPPROTO_DONE);
5780         }
5781 #endif
5782         sctp_input_with_port(m, off, 0);
5783         return (IPPROTO_DONE);
5784 }
5785 #endif