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