sys/netinet/sctp_input.c

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