sys/netinet6/sctp6_usrreq.c

   1 /*-
   2  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2011, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2011, by Michael Tuexen. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * a) Redistributions of source code must retain the above copyright notice,
  10  *   this list of conditions and the following disclaimer.
  11  *
  12  * b) Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *   the documentation and/or other materials provided with the distribution.
  15  *
  16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32 /*      $KAME: sctp6_usrreq.c,v 1.38 2005/08/24 08:08:56 suz Exp $      */
  33
  34 #include <sys/cdefs.h>
  35 __FBSDID("$FreeBSD$");
  36
  37 #include <netinet/sctp_os.h>
  38 #include <sys/proc.h>
  39 #include <netinet/sctp_pcb.h>
  40 #include <netinet/sctp_header.h>
  41 #include <netinet/sctp_var.h>
  42 #if defined(INET6)
  43 #include <netinet6/sctp6_var.h>
  44 #endif
  45 #include <netinet/sctp_sysctl.h>
  46 #include <netinet/sctp_output.h>
  47 #include <netinet/sctp_uio.h>
  48 #include <netinet/sctp_asconf.h>
  49 #include <netinet/sctputil.h>
  50 #include <netinet/sctp_indata.h>
  51 #include <netinet/sctp_timer.h>
  52 #include <netinet/sctp_auth.h>
  53 #include <netinet/sctp_input.h>
  54 #include <netinet/sctp_output.h>
  55 #include <netinet/sctp_bsd_addr.h>
  56 #include <netinet/sctp_crc32.h>
  57 #include <netinet/udp.h>
  58
  59 #ifdef IPSEC
  60 #include <netipsec/ipsec.h>
  61 #if defined(INET6)
  62 #include <netipsec/ipsec6.h>
  63 #endif                          /* INET6 */
  64 #endif                          /* IPSEC */
  65
  66 extern struct protosw inetsw[];
  67
  68 int
  69 sctp6_input(struct mbuf **i_pak, int *offp, int proto)
  70 {
  71         struct mbuf *m;
  72         struct ip6_hdr *ip6;
  73         struct sctphdr *sh;
  74         struct sctp_inpcb *in6p = NULL;
  75         struct sctp_nets *net;
  76         int refcount_up = 0;
  77         uint32_t vrf_id = 0;
  78
  79 #ifdef IPSEC
  80         struct inpcb *in6p_ip;
  81
  82 #endif
  83         struct sctp_chunkhdr *ch;
  84         int length, offset, iphlen;
  85         uint8_t ecn_bits;
  86         struct sctp_tcb *stcb = NULL;
  87         int pkt_len = 0;
  88
  89 #if !defined(SCTP_WITH_NO_CSUM)
  90         uint32_t check, calc_check;
  91
  92 #endif
  93         int off = *offp;
  94         uint16_t port = 0;
  95
  96         /* get the VRF and table id's */
  97         if (SCTP_GET_PKT_VRFID(*i_pak, vrf_id)) {
  98                 SCTP_RELEASE_PKT(*i_pak);
  99                 return (-1);
 100         }
 101         m = SCTP_HEADER_TO_CHAIN(*i_pak);
 102         pkt_len = SCTP_HEADER_LEN((*i_pak));
 103
 104 #ifdef  SCTP_PACKET_LOGGING
 105         sctp_packet_log(m, pkt_len);
 106 #endif
 107         ip6 = mtod(m, struct ip6_hdr *);
 108         /* Ensure that (sctphdr + sctp_chunkhdr) in a row. */
 109         IP6_EXTHDR_GET(sh, struct sctphdr *, m, off,
 110             (int)(sizeof(*sh) + sizeof(*ch)));
 111         if (sh == NULL) {
 112                 SCTP_STAT_INCR(sctps_hdrops);
 113                 return IPPROTO_DONE;
 114         }
 115         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
 116         iphlen = off;
 117         offset = iphlen + sizeof(*sh) + sizeof(*ch);
 118         SCTPDBG(SCTP_DEBUG_INPUT1,
 119             "sctp6_input() length:%d iphlen:%d\n", pkt_len, iphlen);
 120
 121
 122 #if defined(NFAITH) && NFAITH > 0
 123
 124         if (faithprefix_p != NULL && (*faithprefix_p) (&ip6->ip6_dst)) {
 125                 /* XXX send icmp6 host/port unreach? */
 126                 goto bad;
 127         }
 128 #endif                          /* NFAITH defined and > 0 */
 129         SCTP_STAT_INCR(sctps_recvpackets);
 130         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
 131         SCTPDBG(SCTP_DEBUG_INPUT1, "V6 input gets a packet iphlen:%d pktlen:%d\n",
 132             iphlen, pkt_len);
 133         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 134                 /* No multi-cast support in SCTP */
 135                 goto bad;
 136         }
 137         /* destination port of 0 is illegal, based on RFC2960. */
 138         if (sh->dest_port == 0)
 139                 goto bad;
 140
 141         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
 142             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n",
 143             m->m_pkthdr.len,
 144             if_name(m->m_pkthdr.rcvif),
 145             m->m_pkthdr.csum_flags);
 146 #if defined(SCTP_WITH_NO_CSUM)
 147         SCTP_STAT_INCR(sctps_recvnocrc);
 148 #else
 149         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
 150                 SCTP_STAT_INCR(sctps_recvhwcrc);
 151                 goto sctp_skip_csum;
 152         }
 153         check = sh->checksum;   /* save incoming checksum */
 154         if ((check == 0) && (SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback)) &&
 155             (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, &ip6->ip6_dst))) {
 156                 SCTP_STAT_INCR(sctps_recvnocrc);
 157                 goto sctp_skip_csum;
 158         }
 159         sh->checksum = 0;       /* prepare for calc */
 160         calc_check = sctp_calculate_cksum(m, iphlen);
 161         SCTP_STAT_INCR(sctps_recvswcrc);
 162         if (calc_check != check) {
 163                 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p phlen:%d\n",
 164                     calc_check, check, m, iphlen);
 165                 stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch),
 166                     sh, ch, &in6p, &net, vrf_id);
 167                 if ((net) && (port)) {
 168                         if (net->port == 0) {
 169                                 sctp_pathmtu_adjustment(in6p, stcb, net, net->mtu - sizeof(struct udphdr));
 170                         }
 171                         net->port = port;
 172                 }
 173                 if ((net != NULL) && (m->m_flags & M_FLOWID)) {
 174                         net->flowid = m->m_pkthdr.flowid;
 175 #ifdef INVARIANTS
 176                         net->flowidset = 1;
 177 #endif
 178                 }
 179                 /* in6p's ref-count increased && stcb locked */
 180                 if ((in6p) && (stcb)) {
 181                         sctp_send_packet_dropped(stcb, net, m, iphlen, 1);
 182                         sctp_chunk_output((struct sctp_inpcb *)in6p, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
 183                 } else if ((in6p != NULL) && (stcb == NULL)) {
 184                         refcount_up = 1;
 185                 }
 186                 SCTP_STAT_INCR(sctps_badsum);
 187                 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
 188                 goto bad;
 189         }
 190         sh->checksum = calc_check;
 191
 192 sctp_skip_csum:
 193 #endif
 194         net = NULL;
 195         /*
 196          * Locate pcb and tcb for datagram sctp_findassociation_addr() wants
 197          * IP/SCTP/first chunk header...
 198          */
 199         stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch),
 200             sh, ch, &in6p, &net, vrf_id);
 201         if ((net) && (port)) {
 202                 if (net->port == 0) {
 203                         sctp_pathmtu_adjustment(in6p, stcb, net, net->mtu - sizeof(struct udphdr));
 204                 }
 205                 net->port = port;
 206         }
 207         if ((net != NULL) && (m->m_flags & M_FLOWID)) {
 208                 net->flowid = m->m_pkthdr.flowid;
 209 #ifdef INVARIANTS
 210                 net->flowidset = 1;
 211 #endif
 212         }
 213         /* in6p's ref-count increased */
 214         if (in6p == NULL) {
 215                 struct sctp_init_chunk *init_chk, chunk_buf;
 216
 217                 SCTP_STAT_INCR(sctps_noport);
 218                 if (ch->chunk_type == SCTP_INITIATION) {
 219                         /*
 220                          * we do a trick here to get the INIT tag, dig in
 221                          * and get the tag from the INIT and put it in the
 222                          * common header.
 223                          */
 224                         init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m,
 225                             iphlen + sizeof(*sh), sizeof(*init_chk),
 226                             (uint8_t *) & chunk_buf);
 227                         if (init_chk)
 228                                 sh->v_tag = init_chk->init.initiate_tag;
 229                         else
 230                                 sh->v_tag = 0;
 231                 }
 232                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
 233                         sctp_send_shutdown_complete2(m, iphlen, sh, vrf_id, port);
 234                         goto bad;
 235                 }
 236                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
 237                         goto bad;
 238                 }
 239                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION)
 240                         sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port);
 241                 goto bad;
 242         } else if (stcb == NULL) {
 243                 refcount_up = 1;
 244         }
 245 #ifdef IPSEC
 246         /*
 247          * Check AH/ESP integrity.
 248          */
 249         in6p_ip = (struct inpcb *)in6p;
 250         if (in6p_ip && (ipsec6_in_reject(m, in6p_ip))) {
 251 /* XXX */
 252                 MODULE_GLOBAL(ipsec6stat).in_polvio++;
 253                 goto bad;
 254         }
 255 #endif                          /* IPSEC */
 256
 257         /*
 258          * CONTROL chunk processing
 259          */
 260         offset -= sizeof(*ch);
 261         ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff);
 262
 263         /* Length now holds the total packet length payload + iphlen */
 264         length = ntohs(ip6->ip6_plen) + iphlen;
 265
 266         /* sa_ignore NO_NULL_CHK */
 267         sctp_common_input_processing(&m, iphlen, offset, length, sh, ch,
 268             in6p, stcb, net, ecn_bits, vrf_id, port);
 269         /* inp's ref-count reduced && stcb unlocked */
 270         /* XXX this stuff below gets moved to appropriate parts later... */
 271         if (m)
 272                 sctp_m_freem(m);
 273         if ((in6p) && refcount_up) {
 274                 /* reduce ref-count */
 275                 SCTP_INP_WLOCK(in6p);
 276                 SCTP_INP_DECR_REF(in6p);
 277                 SCTP_INP_WUNLOCK(in6p);
 278         }
 279         return IPPROTO_DONE;
 280
 281 bad:
 282         if (stcb) {
 283                 SCTP_TCB_UNLOCK(stcb);
 284         }
 285         if ((in6p) && refcount_up) {
 286                 /* reduce ref-count */
 287                 SCTP_INP_WLOCK(in6p);
 288                 SCTP_INP_DECR_REF(in6p);
 289                 SCTP_INP_WUNLOCK(in6p);
 290         }
 291         if (m)
 292                 sctp_m_freem(m);
 293         return IPPROTO_DONE;
 294 }
 295
 296
 297 static void
 298 sctp6_notify_mbuf(struct sctp_inpcb *inp, struct icmp6_hdr *icmp6,
 299     struct sctphdr *sh, struct sctp_tcb *stcb, struct sctp_nets *net)
 300 {
 301         uint32_t nxtsz;
 302
 303         if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
 304             (icmp6 == NULL) || (sh == NULL)) {
 305                 goto out;
 306         }
 307         /* First do we even look at it? */
 308         if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag))
 309                 goto out;
 310
 311         if (icmp6->icmp6_type != ICMP6_PACKET_TOO_BIG) {
 312                 /* not PACKET TO BIG */
 313                 goto out;
 314         }
 315         /*
 316          * ok we need to look closely. We could even get smarter and look at
 317          * anyone that we sent to in case we get a different ICMP that tells
 318          * us there is no way to reach a host, but for this impl, all we
 319          * care about is MTU discovery.
 320          */
 321         nxtsz = ntohl(icmp6->icmp6_mtu);
 322         /* Stop any PMTU timer */
 323         sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL, SCTP_FROM_SCTP6_USRREQ + SCTP_LOC_1);
 324
 325         /* Adjust destination size limit */
 326         if (net->mtu > nxtsz) {
 327                 net->mtu = nxtsz;
 328                 if (net->port) {
 329                         net->mtu -= sizeof(struct udphdr);
 330                 }
 331         }
 332         /* now what about the ep? */
 333         if (stcb->asoc.smallest_mtu > nxtsz) {
 334                 struct sctp_tmit_chunk *chk;
 335
 336                 /* Adjust that too */
 337                 stcb->asoc.smallest_mtu = nxtsz;
 338                 /* now off to subtract IP_DF flag if needed */
 339
 340                 TAILQ_FOREACH(chk, &stcb->asoc.send_queue, sctp_next) {
 341                         if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
 342                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 343                         }
 344                 }
 345                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
 346                         if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
 347                                 /*
 348                                  * For this guy we also mark for immediate
 349                                  * resend since we sent to big of chunk
 350                                  */
 351                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 352                                 if (chk->sent != SCTP_DATAGRAM_RESEND)
 353                                         stcb->asoc.sent_queue_retran_cnt++;
 354                                 chk->sent = SCTP_DATAGRAM_RESEND;
 355                                 chk->rec.data.doing_fast_retransmit = 0;
 356
 357                                 chk->sent = SCTP_DATAGRAM_RESEND;
 358                                 /* Clear any time so NO RTT is being done */
 359                                 chk->sent_rcv_time.tv_sec = 0;
 360                                 chk->sent_rcv_time.tv_usec = 0;
 361                                 stcb->asoc.total_flight -= chk->send_size;
 362                                 net->flight_size -= chk->send_size;
 363                         }
 364                 }
 365         }
 366         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL);
 367 out:
 368         if (stcb) {
 369                 SCTP_TCB_UNLOCK(stcb);
 370         }
 371 }
 372
 373
 374 void
 375 sctp6_notify(struct sctp_inpcb *inp,
 376     struct icmp6_hdr *icmph,
 377     struct sctphdr *sh,
 378     struct sockaddr *to,
 379     struct sctp_tcb *stcb,
 380     struct sctp_nets *net)
 381 {
 382 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 383         struct socket *so;
 384
 385 #endif
 386         /* protection */
 387         int reason;
 388
 389
 390         if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
 391             (sh == NULL) || (to == NULL)) {
 392                 if (stcb)
 393                         SCTP_TCB_UNLOCK(stcb);
 394                 return;
 395         }
 396         /* First job is to verify the vtag matches what I would send */
 397         if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag)) {
 398                 SCTP_TCB_UNLOCK(stcb);
 399                 return;
 400         }
 401         if (icmph->icmp6_type != ICMP_UNREACH) {
 402                 /* We only care about unreachable */
 403                 SCTP_TCB_UNLOCK(stcb);
 404                 return;
 405         }
 406         if ((icmph->icmp6_code == ICMP_UNREACH_NET) ||
 407             (icmph->icmp6_code == ICMP_UNREACH_HOST) ||
 408             (icmph->icmp6_code == ICMP_UNREACH_NET_UNKNOWN) ||
 409             (icmph->icmp6_code == ICMP_UNREACH_HOST_UNKNOWN) ||
 410             (icmph->icmp6_code == ICMP_UNREACH_ISOLATED) ||
 411             (icmph->icmp6_code == ICMP_UNREACH_NET_PROHIB) ||
 412             (icmph->icmp6_code == ICMP_UNREACH_HOST_PROHIB) ||
 413             (icmph->icmp6_code == ICMP_UNREACH_FILTER_PROHIB)) {
 414
 415                 /*
 416                  * Hmm reachablity problems we must examine closely. If its
 417                  * not reachable, we may have lost a network. Or if there is
 418                  * NO protocol at the other end named SCTP. well we consider
 419                  * it a OOTB abort.
 420                  */
 421                 if (net->dest_state & SCTP_ADDR_REACHABLE) {
 422                         /* Ok that destination is NOT reachable */
 423                         net->dest_state &= ~SCTP_ADDR_REACHABLE;
 424                         net->dest_state &= ~SCTP_ADDR_PF;
 425                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
 426                             stcb, SCTP_FAILED_THRESHOLD,
 427                             (void *)net, SCTP_SO_NOT_LOCKED);
 428                 }
 429                 SCTP_TCB_UNLOCK(stcb);
 430         } else if ((icmph->icmp6_code == ICMP_UNREACH_PROTOCOL) ||
 431             (icmph->icmp6_code == ICMP_UNREACH_PORT)) {
 432                 /*
 433                  * Here the peer is either playing tricks on us, including
 434                  * an address that belongs to someone who does not support
 435                  * SCTP OR was a userland implementation that shutdown and
 436                  * now is dead. In either case treat it like a OOTB abort
 437                  * with no TCB
 438                  */
 439                 reason = SCTP_PEER_FAULTY;
 440                 sctp_abort_notification(stcb, reason, SCTP_SO_NOT_LOCKED);
 441 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 442                 so = SCTP_INP_SO(inp);
 443                 atomic_add_int(&stcb->asoc.refcnt, 1);
 444                 SCTP_TCB_UNLOCK(stcb);
 445                 SCTP_SOCKET_LOCK(so, 1);
 446                 SCTP_TCB_LOCK(stcb);
 447                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 448 #endif
 449                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2);
 450 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 451                 SCTP_SOCKET_UNLOCK(so, 1);
 452                 /* SCTP_TCB_UNLOCK(stcb); MT: I think this is not needed. */
 453 #endif
 454                 /* no need to unlock here, since the TCB is gone */
 455         } else {
 456                 SCTP_TCB_UNLOCK(stcb);
 457         }
 458 }
 459
 460
 461
 462 void
 463 sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d)
 464 {
 465         struct sctphdr sh;
 466         struct ip6ctlparam *ip6cp = NULL;
 467         uint32_t vrf_id;
 468
 469         vrf_id = SCTP_DEFAULT_VRFID;
 470
 471         if (pktdst->sa_family != AF_INET6 ||
 472             pktdst->sa_len != sizeof(struct sockaddr_in6))
 473                 return;
 474
 475         if ((unsigned)cmd >= PRC_NCMDS)
 476                 return;
 477         if (PRC_IS_REDIRECT(cmd)) {
 478                 d = NULL;
 479         } else if (inet6ctlerrmap[cmd] == 0) {
 480                 return;
 481         }
 482         /* if the parameter is from icmp6, decode it. */
 483         if (d != NULL) {
 484                 ip6cp = (struct ip6ctlparam *)d;
 485         } else {
 486                 ip6cp = (struct ip6ctlparam *)NULL;
 487         }
 488
 489         if (ip6cp) {
 490                 /*
 491                  * XXX: We assume that when IPV6 is non NULL, M and OFF are
 492                  * valid.
 493                  */
 494                 /* check if we can safely examine src and dst ports */
 495                 struct sctp_inpcb *inp = NULL;
 496                 struct sctp_tcb *stcb = NULL;
 497                 struct sctp_nets *net = NULL;
 498                 struct sockaddr_in6 final;
 499
 500                 if (ip6cp->ip6c_m == NULL)
 501                         return;
 502
 503                 bzero(&sh, sizeof(sh));
 504                 bzero(&final, sizeof(final));
 505                 inp = NULL;
 506                 net = NULL;
 507                 m_copydata(ip6cp->ip6c_m, ip6cp->ip6c_off, sizeof(sh),
 508                     (caddr_t)&sh);
 509                 ip6cp->ip6c_src->sin6_port = sh.src_port;
 510                 final.sin6_len = sizeof(final);
 511                 final.sin6_family = AF_INET6;
 512                 final.sin6_addr = ((struct sockaddr_in6 *)pktdst)->sin6_addr;
 513                 final.sin6_port = sh.dest_port;
 514                 stcb = sctp_findassociation_addr_sa((struct sockaddr *)ip6cp->ip6c_src,
 515                     (struct sockaddr *)&final,
 516                     &inp, &net, 1, vrf_id);
 517                 /* inp's ref-count increased && stcb locked */
 518                 if (stcb != NULL && inp && (inp->sctp_socket != NULL)) {
 519                         if (cmd == PRC_MSGSIZE) {
 520                                 sctp6_notify_mbuf(inp,
 521                                     ip6cp->ip6c_icmp6,
 522                                     &sh,
 523                                     stcb,
 524                                     net);
 525                                 /* inp's ref-count reduced && stcb unlocked */
 526                         } else {
 527                                 sctp6_notify(inp, ip6cp->ip6c_icmp6, &sh,
 528                                     (struct sockaddr *)&final,
 529                                     stcb, net);
 530                                 /* inp's ref-count reduced && stcb unlocked */
 531                         }
 532                 } else {
 533                         if (PRC_IS_REDIRECT(cmd) && inp) {
 534                                 in6_rtchange((struct in6pcb *)inp,
 535                                     inet6ctlerrmap[cmd]);
 536                         }
 537                         if (inp) {
 538                                 /* reduce inp's ref-count */
 539                                 SCTP_INP_WLOCK(inp);
 540                                 SCTP_INP_DECR_REF(inp);
 541                                 SCTP_INP_WUNLOCK(inp);
 542                         }
 543                         if (stcb)
 544                                 SCTP_TCB_UNLOCK(stcb);
 545                 }
 546         }
 547 }
 548
 549 /*
 550  * this routine can probably be collasped into the one in sctp_userreq.c
 551  * since they do the same thing and now we lookup with a sockaddr
 552  */
 553 static int
 554 sctp6_getcred(SYSCTL_HANDLER_ARGS)
 555 {
 556         struct xucred xuc;
 557         struct sockaddr_in6 addrs[2];
 558         struct sctp_inpcb *inp;
 559         struct sctp_nets *net;
 560         struct sctp_tcb *stcb;
 561         int error;
 562         uint32_t vrf_id;
 563
 564         vrf_id = SCTP_DEFAULT_VRFID;
 565
 566         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 567         if (error)
 568                 return (error);
 569
 570         if (req->newlen != sizeof(addrs)) {
 571                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 572                 return (EINVAL);
 573         }
 574         if (req->oldlen != sizeof(struct ucred)) {
 575                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 576                 return (EINVAL);
 577         }
 578         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 579         if (error)
 580                 return (error);
 581
 582         stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[0]),
 583             sin6tosa(&addrs[1]),
 584             &inp, &net, 1, vrf_id);
 585         if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) {
 586                 if ((inp != NULL) && (stcb == NULL)) {
 587                         /* reduce ref-count */
 588                         SCTP_INP_WLOCK(inp);
 589                         SCTP_INP_DECR_REF(inp);
 590                         goto cred_can_cont;
 591                 }
 592                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 593                 error = ENOENT;
 594                 goto out;
 595         }
 596         SCTP_TCB_UNLOCK(stcb);
 597         /*
 598          * We use the write lock here, only since in the error leg we need
 599          * it. If we used RLOCK, then we would have to
 600          * wlock/decr/unlock/rlock. Which in theory could create a hole.
 601          * Better to use higher wlock.
 602          */
 603         SCTP_INP_WLOCK(inp);
 604 cred_can_cont:
 605         error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket);
 606         if (error) {
 607                 SCTP_INP_WUNLOCK(inp);
 608                 goto out;
 609         }
 610         cru2x(inp->sctp_socket->so_cred, &xuc);
 611         SCTP_INP_WUNLOCK(inp);
 612         error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 613 out:
 614         return (error);
 615 }
 616
 617 SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW,
 618     0, 0,
 619     sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection");
 620
 621
 622 /* This is the same as the sctp_abort() could be made common */
 623 static void
 624 sctp6_abort(struct socket *so)
 625 {
 626         struct sctp_inpcb *inp;
 627         uint32_t flags;
 628
 629         inp = (struct sctp_inpcb *)so->so_pcb;
 630         if (inp == 0) {
 631                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 632                 return;
 633         }
 634 sctp_must_try_again:
 635         flags = inp->sctp_flags;
 636 #ifdef SCTP_LOG_CLOSING
 637         sctp_log_closing(inp, NULL, 17);
 638 #endif
 639         if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) &&
 640             (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) {
 641 #ifdef SCTP_LOG_CLOSING
 642                 sctp_log_closing(inp, NULL, 16);
 643 #endif
 644                 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT,
 645                     SCTP_CALLED_AFTER_CMPSET_OFCLOSE);
 646                 SOCK_LOCK(so);
 647                 SCTP_SB_CLEAR(so->so_snd);
 648                 /*
 649                  * same for the rcv ones, they are only here for the
 650                  * accounting/select.
 651                  */
 652                 SCTP_SB_CLEAR(so->so_rcv);
 653                 /* Now null out the reference, we are completely detached. */
 654                 so->so_pcb = NULL;
 655                 SOCK_UNLOCK(so);
 656         } else {
 657                 flags = inp->sctp_flags;
 658                 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) {
 659                         goto sctp_must_try_again;
 660                 }
 661         }
 662         return;
 663 }
 664
 665 static int
 666 sctp6_attach(struct socket *so, int proto, struct thread *p)
 667 {
 668         struct in6pcb *inp6;
 669         int error;
 670         struct sctp_inpcb *inp;
 671         uint32_t vrf_id = SCTP_DEFAULT_VRFID;
 672
 673         inp = (struct sctp_inpcb *)so->so_pcb;
 674         if (inp != NULL) {
 675                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 676                 return EINVAL;
 677         }
 678         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 679                 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace));
 680                 if (error)
 681                         return error;
 682         }
 683         error = sctp_inpcb_alloc(so, vrf_id);
 684         if (error)
 685                 return error;
 686         inp = (struct sctp_inpcb *)so->so_pcb;
 687         SCTP_INP_WLOCK(inp);
 688         inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6;     /* I'm v6! */
 689         inp6 = (struct in6pcb *)inp;
 690
 691         inp6->inp_vflag |= INP_IPV6;
 692         inp6->in6p_hops = -1;   /* use kernel default */
 693         inp6->in6p_cksum = -1;  /* just to be sure */
 694 #ifdef INET
 695         /*
 696          * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6
 697          * socket as well, because the socket may be bound to an IPv6
 698          * wildcard address, which may match an IPv4-mapped IPv6 address.
 699          */
 700         inp6->inp_ip_ttl = MODULE_GLOBAL(ip_defttl);
 701 #endif
 702         /*
 703          * Hmm what about the IPSEC stuff that is missing here but in
 704          * sctp_attach()?
 705          */
 706         SCTP_INP_WUNLOCK(inp);
 707         return 0;
 708 }
 709
 710 static int
 711 sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p)
 712 {
 713         struct sctp_inpcb *inp;
 714         struct in6pcb *inp6;
 715         int error;
 716
 717         inp = (struct sctp_inpcb *)so->so_pcb;
 718         if (inp == 0) {
 719                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 720                 return EINVAL;
 721         }
 722         if (addr) {
 723                 switch (addr->sa_family) {
 724 #ifdef INET
 725                 case AF_INET:
 726                         if (addr->sa_len != sizeof(struct sockaddr_in)) {
 727                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 728                                 return EINVAL;
 729                         }
 730                         break;
 731 #endif
 732 #ifdef INET6
 733                 case AF_INET6:
 734                         if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 735                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 736                                 return EINVAL;
 737                         }
 738                         break;
 739 #endif
 740                 default:
 741                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 742                         return EINVAL;
 743                 }
 744         }
 745         inp6 = (struct in6pcb *)inp;
 746         inp6->inp_vflag &= ~INP_IPV4;
 747         inp6->inp_vflag |= INP_IPV6;
 748         if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp6) == 0)) {
 749                 switch (addr->sa_family) {
 750 #ifdef INET
 751                 case AF_INET:
 752                         /* binding v4 addr to v6 socket, so reset flags */
 753                         inp6->inp_vflag |= INP_IPV4;
 754                         inp6->inp_vflag &= ~INP_IPV6;
 755                         break;
 756 #endif
 757 #ifdef INET6
 758                 case AF_INET6:
 759                         {
 760                                 struct sockaddr_in6 *sin6_p;
 761
 762                                 sin6_p = (struct sockaddr_in6 *)addr;
 763
 764                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
 765                                         inp6->inp_vflag |= INP_IPV4;
 766                                 }
 767 #ifdef INET
 768                                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 769                                         struct sockaddr_in sin;
 770
 771                                         in6_sin6_2_sin(&sin, sin6_p);
 772                                         inp6->inp_vflag |= INP_IPV4;
 773                                         inp6->inp_vflag &= ~INP_IPV6;
 774                                         error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p);
 775                                         return error;
 776                                 }
 777 #endif
 778                                 break;
 779                         }
 780 #endif
 781                 default:
 782                         break;
 783                 }
 784         } else if (addr != NULL) {
 785                 struct sockaddr_in6 *sin6_p;
 786
 787                 /* IPV6_V6ONLY socket */
 788 #ifdef INET
 789                 if (addr->sa_family == AF_INET) {
 790                         /* can't bind v4 addr to v6 only socket! */
 791                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 792                         return EINVAL;
 793                 }
 794 #endif
 795                 sin6_p = (struct sockaddr_in6 *)addr;
 796
 797                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 798                         /* can't bind v4-mapped addrs either! */
 799                         /* NOTE: we don't support SIIT */
 800                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 801                         return EINVAL;
 802                 }
 803         }
 804         error = sctp_inpcb_bind(so, addr, NULL, p);
 805         return error;
 806 }
 807
 808
 809 static void
 810 sctp6_close(struct socket *so)
 811 {
 812         sctp_close(so);
 813 }
 814
 815 /* This could be made common with sctp_detach() since they are identical */
 816
 817 static
 818 int
 819 sctp6_disconnect(struct socket *so)
 820 {
 821         return (sctp_disconnect(so));
 822 }
 823
 824
 825 int
 826 sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 827     struct mbuf *control, struct thread *p);
 828
 829
 830 static int
 831 sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 832     struct mbuf *control, struct thread *p)
 833 {
 834         struct sctp_inpcb *inp;
 835         struct in6pcb *inp6;
 836
 837 #ifdef INET
 838         struct sockaddr_in6 *sin6;
 839
 840 #endif                          /* INET */
 841         /* No SPL needed since sctp_output does this */
 842
 843         inp = (struct sctp_inpcb *)so->so_pcb;
 844         if (inp == NULL) {
 845                 if (control) {
 846                         SCTP_RELEASE_PKT(control);
 847                         control = NULL;
 848                 }
 849                 SCTP_RELEASE_PKT(m);
 850                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 851                 return EINVAL;
 852         }
 853         inp6 = (struct in6pcb *)inp;
 854         /*
 855          * For the TCP model we may get a NULL addr, if we are a connected
 856          * socket thats ok.
 857          */
 858         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) &&
 859             (addr == NULL)) {
 860                 goto connected_type;
 861         }
 862         if (addr == NULL) {
 863                 SCTP_RELEASE_PKT(m);
 864                 if (control) {
 865                         SCTP_RELEASE_PKT(control);
 866                         control = NULL;
 867                 }
 868                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ);
 869                 return (EDESTADDRREQ);
 870         }
 871 #ifdef INET
 872         sin6 = (struct sockaddr_in6 *)addr;
 873         if (SCTP_IPV6_V6ONLY(inp6)) {
 874                 /*
 875                  * if IPV6_V6ONLY flag, we discard datagrams destined to a
 876                  * v4 addr or v4-mapped addr
 877                  */
 878                 if (addr->sa_family == AF_INET) {
 879                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 880                         return EINVAL;
 881                 }
 882                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 883                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 884                         return EINVAL;
 885                 }
 886         }
 887         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 888                 if (!MODULE_GLOBAL(ip6_v6only)) {
 889                         struct sockaddr_in sin;
 890
 891                         /* convert v4-mapped into v4 addr and send */
 892                         in6_sin6_2_sin(&sin, sin6);
 893                         return sctp_sendm(so, flags, m, (struct sockaddr *)&sin,
 894                             control, p);
 895                 } else {
 896                         /* mapped addresses aren't enabled */
 897                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 898                         return EINVAL;
 899                 }
 900         }
 901 #endif                          /* INET */
 902 connected_type:
 903         /* now what about control */
 904         if (control) {
 905                 if (inp->control) {
 906                         SCTP_PRINTF("huh? control set?\n");
 907                         SCTP_RELEASE_PKT(inp->control);
 908                         inp->control = NULL;
 909                 }
 910                 inp->control = control;
 911         }
 912         /* Place the data */
 913         if (inp->pkt) {
 914                 SCTP_BUF_NEXT(inp->pkt_last) = m;
 915                 inp->pkt_last = m;
 916         } else {
 917                 inp->pkt_last = inp->pkt = m;
 918         }
 919         if (
 920         /* FreeBSD and MacOSX uses a flag passed */
 921             ((flags & PRUS_MORETOCOME) == 0)
 922             ) {
 923                 /*
 924                  * note with the current version this code will only be used
 925                  * by OpenBSD, NetBSD and FreeBSD have methods for
 926                  * re-defining sosend() to use sctp_sosend().  One can
 927                  * optionaly switch back to this code (by changing back the
 928                  * defininitions but this is not advisable.
 929                  */
 930                 int ret;
 931
 932                 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
 933                 inp->pkt = NULL;
 934                 inp->control = NULL;
 935                 return (ret);
 936         } else {
 937                 return (0);
 938         }
 939 }
 940
 941 static int
 942 sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
 943 {
 944         uint32_t vrf_id;
 945         int error = 0;
 946         struct sctp_inpcb *inp;
 947         struct in6pcb *inp6;
 948         struct sctp_tcb *stcb;
 949
 950 #ifdef INET
 951         struct sockaddr_in6 *sin6;
 952         struct sockaddr_storage ss;
 953
 954 #endif
 955
 956         inp6 = (struct in6pcb *)so->so_pcb;
 957         inp = (struct sctp_inpcb *)so->so_pcb;
 958         if (inp == 0) {
 959                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 960                 return (ECONNRESET);    /* I made the same as TCP since we are
 961                                          * not setup? */
 962         }
 963         if (addr == NULL) {
 964                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 965                 return (EINVAL);
 966         }
 967         switch (addr->sa_family) {
 968 #ifdef INET
 969         case AF_INET:
 970                 if (addr->sa_len != sizeof(struct sockaddr_in)) {
 971                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 972                         return (EINVAL);
 973                 }
 974                 break;
 975 #endif
 976 #ifdef INET6
 977         case AF_INET6:
 978                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 979                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 980                         return (EINVAL);
 981                 }
 982                 break;
 983 #endif
 984         default:
 985                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 986                 return (EINVAL);
 987         }
 988
 989         vrf_id = inp->def_vrf_id;
 990         SCTP_ASOC_CREATE_LOCK(inp);
 991         SCTP_INP_RLOCK(inp);
 992         if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) ==
 993             SCTP_PCB_FLAGS_UNBOUND) {
 994                 /* Bind a ephemeral port */
 995                 SCTP_INP_RUNLOCK(inp);
 996                 error = sctp6_bind(so, NULL, p);
 997                 if (error) {
 998                         SCTP_ASOC_CREATE_UNLOCK(inp);
 999
1000                         return (error);
1001                 }
1002                 SCTP_INP_RLOCK(inp);
1003         }
1004         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
1005             (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) {
1006                 /* We are already connected AND the TCP model */
1007                 SCTP_INP_RUNLOCK(inp);
1008                 SCTP_ASOC_CREATE_UNLOCK(inp);
1009                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE);
1010                 return (EADDRINUSE);
1011         }
1012 #ifdef INET
1013         sin6 = (struct sockaddr_in6 *)addr;
1014         if (SCTP_IPV6_V6ONLY(inp6)) {
1015                 /*
1016                  * if IPV6_V6ONLY flag, ignore connections destined to a v4
1017                  * addr or v4-mapped addr
1018                  */
1019                 if (addr->sa_family == AF_INET) {
1020                         SCTP_INP_RUNLOCK(inp);
1021                         SCTP_ASOC_CREATE_UNLOCK(inp);
1022                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1023                         return EINVAL;
1024                 }
1025                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
1026                         SCTP_INP_RUNLOCK(inp);
1027                         SCTP_ASOC_CREATE_UNLOCK(inp);
1028                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1029                         return EINVAL;
1030                 }
1031         }
1032         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
1033                 if (!MODULE_GLOBAL(ip6_v6only)) {
1034                         /* convert v4-mapped into v4 addr */
1035                         in6_sin6_2_sin((struct sockaddr_in *)&ss, sin6);
1036                         addr = (struct sockaddr *)&ss;
1037                 } else {
1038                         /* mapped addresses aren't enabled */
1039                         SCTP_INP_RUNLOCK(inp);
1040                         SCTP_ASOC_CREATE_UNLOCK(inp);
1041                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1042                         return EINVAL;
1043                 }
1044         }
1045 #endif                          /* INET */
1046         /* Now do we connect? */
1047         if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
1048                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
1049                 if (stcb) {
1050                         SCTP_TCB_UNLOCK(stcb);
1051                 }
1052                 SCTP_INP_RUNLOCK(inp);
1053         } else {
1054                 SCTP_INP_RUNLOCK(inp);
1055                 SCTP_INP_WLOCK(inp);
1056                 SCTP_INP_INCR_REF(inp);
1057                 SCTP_INP_WUNLOCK(inp);
1058                 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL);
1059                 if (stcb == NULL) {
1060                         SCTP_INP_WLOCK(inp);
1061                         SCTP_INP_DECR_REF(inp);
1062                         SCTP_INP_WUNLOCK(inp);
1063                 }
1064         }
1065
1066         if (stcb != NULL) {
1067                 /* Already have or am bring up an association */
1068                 SCTP_ASOC_CREATE_UNLOCK(inp);
1069                 SCTP_TCB_UNLOCK(stcb);
1070                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY);
1071                 return (EALREADY);
1072         }
1073         /* We are GOOD to go */
1074         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id, p);
1075         SCTP_ASOC_CREATE_UNLOCK(inp);
1076         if (stcb == NULL) {
1077                 /* Gak! no memory */
1078                 return (error);
1079         }
1080         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
1081                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
1082                 /* Set the connected flag so we can queue data */
1083                 soisconnecting(so);
1084         }
1085         stcb->asoc.state = SCTP_STATE_COOKIE_WAIT;
1086         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1087
1088         /* initialize authentication parameters for the assoc */
1089         sctp_initialize_auth_params(inp, stcb);
1090
1091         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
1092         SCTP_TCB_UNLOCK(stcb);
1093         return error;
1094 }
1095
1096 static int
1097 sctp6_getaddr(struct socket *so, struct sockaddr **addr)
1098 {
1099         struct sockaddr_in6 *sin6;
1100         struct sctp_inpcb *inp;
1101         uint32_t vrf_id;
1102         struct sctp_ifa *sctp_ifa;
1103
1104         int error;
1105
1106         /*
1107          * Do the malloc first in case it blocks.
1108          */
1109         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof(*sin6));
1110         if (sin6 == NULL)
1111                 return ENOMEM;
1112         sin6->sin6_family = AF_INET6;
1113         sin6->sin6_len = sizeof(*sin6);
1114
1115         inp = (struct sctp_inpcb *)so->so_pcb;
1116         if (inp == NULL) {
1117                 SCTP_FREE_SONAME(sin6);
1118                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1119                 return ECONNRESET;
1120         }
1121         SCTP_INP_RLOCK(inp);
1122         sin6->sin6_port = inp->sctp_lport;
1123         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
1124                 /* For the bound all case you get back 0 */
1125                 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
1126                         struct sctp_tcb *stcb;
1127                         struct sockaddr_in6 *sin_a6;
1128                         struct sctp_nets *net;
1129                         int fnd;
1130
1131                         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1132                         if (stcb == NULL) {
1133                                 goto notConn6;
1134                         }
1135                         fnd = 0;
1136                         sin_a6 = NULL;
1137                         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1138                                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1139                                 if (sin_a6 == NULL)
1140                                         /* this will make coverity happy */
1141                                         continue;
1142
1143                                 if (sin_a6->sin6_family == AF_INET6) {
1144                                         fnd = 1;
1145                                         break;
1146                                 }
1147                         }
1148                         if ((!fnd) || (sin_a6 == NULL)) {
1149                                 /* punt */
1150                                 goto notConn6;
1151                         }
1152                         vrf_id = inp->def_vrf_id;
1153                         sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *) & net->ro, net, 0, vrf_id);
1154                         if (sctp_ifa) {
1155                                 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr;
1156                         }
1157                 } else {
1158                         /* For the bound all case you get back 0 */
1159         notConn6:
1160                         memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr));
1161                 }
1162         } else {
1163                 /* Take the first IPv6 address in the list */
1164                 struct sctp_laddr *laddr;
1165                 int fnd = 0;
1166
1167                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
1168                         if (laddr->ifa->address.sa.sa_family == AF_INET6) {
1169                                 struct sockaddr_in6 *sin_a;
1170
1171                                 sin_a = (struct sockaddr_in6 *)&laddr->ifa->address.sin6;
1172                                 sin6->sin6_addr = sin_a->sin6_addr;
1173                                 fnd = 1;
1174                                 break;
1175                         }
1176                 }
1177                 if (!fnd) {
1178                         SCTP_FREE_SONAME(sin6);
1179                         SCTP_INP_RUNLOCK(inp);
1180                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1181                         return ENOENT;
1182                 }
1183         }
1184         SCTP_INP_RUNLOCK(inp);
1185         /* Scoping things for v6 */
1186         if ((error = sa6_recoverscope(sin6)) != 0) {
1187                 SCTP_FREE_SONAME(sin6);
1188                 return (error);
1189         }
1190         (*addr) = (struct sockaddr *)sin6;
1191         return (0);
1192 }
1193
1194 static int
1195 sctp6_peeraddr(struct socket *so, struct sockaddr **addr)
1196 {
1197         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)*addr;
1198         int fnd;
1199         struct sockaddr_in6 *sin_a6;
1200         struct sctp_inpcb *inp;
1201         struct sctp_tcb *stcb;
1202         struct sctp_nets *net;
1203
1204         int error;
1205
1206         /*
1207          * Do the malloc first in case it blocks.
1208          */
1209         inp = (struct sctp_inpcb *)so->so_pcb;
1210         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0) {
1211                 /* UDP type and listeners will drop out here */
1212                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN);
1213                 return (ENOTCONN);
1214         }
1215         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1216         if (sin6 == NULL)
1217                 return (ENOMEM);
1218         sin6->sin6_family = AF_INET6;
1219         sin6->sin6_len = sizeof(*sin6);
1220
1221         /* We must recapture incase we blocked */
1222         inp = (struct sctp_inpcb *)so->so_pcb;
1223         if (inp == NULL) {
1224                 SCTP_FREE_SONAME(sin6);
1225                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1226                 return ECONNRESET;
1227         }
1228         SCTP_INP_RLOCK(inp);
1229         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1230         if (stcb) {
1231                 SCTP_TCB_LOCK(stcb);
1232         }
1233         SCTP_INP_RUNLOCK(inp);
1234         if (stcb == NULL) {
1235                 SCTP_FREE_SONAME(sin6);
1236                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1237                 return ECONNRESET;
1238         }
1239         fnd = 0;
1240         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1241                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1242                 if (sin_a6->sin6_family == AF_INET6) {
1243                         fnd = 1;
1244                         sin6->sin6_port = stcb->rport;
1245                         sin6->sin6_addr = sin_a6->sin6_addr;
1246                         break;
1247                 }
1248         }
1249         SCTP_TCB_UNLOCK(stcb);
1250         if (!fnd) {
1251                 /* No IPv4 address */
1252                 SCTP_FREE_SONAME(sin6);
1253                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1254                 return ENOENT;
1255         }
1256         if ((error = sa6_recoverscope(sin6)) != 0)
1257                 return (error);
1258         *addr = (struct sockaddr *)sin6;
1259         return (0);
1260 }
1261
1262 static int
1263 sctp6_in6getaddr(struct socket *so, struct sockaddr **nam)
1264 {
1265 #ifdef INET
1266         struct sockaddr *addr;
1267
1268 #endif
1269         struct in6pcb *inp6 = sotoin6pcb(so);
1270         int error;
1271
1272         if (inp6 == NULL) {
1273                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1274                 return EINVAL;
1275         }
1276         /* allow v6 addresses precedence */
1277         error = sctp6_getaddr(so, nam);
1278 #ifdef INET
1279         if (error) {
1280                 /* try v4 next if v6 failed */
1281                 error = sctp_ingetaddr(so, nam);
1282                 if (error) {
1283                         return (error);
1284                 }
1285                 addr = *nam;
1286                 /* if I'm V6ONLY, convert it to v4-mapped */
1287                 if (SCTP_IPV6_V6ONLY(inp6)) {
1288                         struct sockaddr_in6 sin6;
1289
1290                         in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
1291                         memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
1292                 }
1293         }
1294 #endif
1295         return (error);
1296 }
1297
1298
1299 static int
1300 sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
1301 {
1302 #ifdef INET
1303         struct sockaddr *addr;
1304
1305 #endif
1306         struct in6pcb *inp6 = sotoin6pcb(so);
1307         int error;
1308
1309         if (inp6 == NULL) {
1310                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1311                 return EINVAL;
1312         }
1313         /* allow v6 addresses precedence */
1314         error = sctp6_peeraddr(so, nam);
1315 #ifdef INET
1316         if (error) {
1317                 /* try v4 next if v6 failed */
1318                 error = sctp_peeraddr(so, nam);
1319                 if (error) {
1320                         return (error);
1321                 }
1322                 addr = *nam;
1323                 /* if I'm V6ONLY, convert it to v4-mapped */
1324                 if (SCTP_IPV6_V6ONLY(inp6)) {
1325                         struct sockaddr_in6 sin6;
1326
1327                         in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
1328                         memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
1329                 }
1330         }
1331 #endif
1332         return error;
1333 }
1334
1335 struct pr_usrreqs sctp6_usrreqs = {
1336         .pru_abort = sctp6_abort,
1337         .pru_accept = sctp_accept,
1338         .pru_attach = sctp6_attach,
1339         .pru_bind = sctp6_bind,
1340         .pru_connect = sctp6_connect,
1341         .pru_control = in6_control,
1342         .pru_close = sctp6_close,
1343         .pru_detach = sctp6_close,
1344         .pru_sopoll = sopoll_generic,
1345         .pru_flush = sctp_flush,
1346         .pru_disconnect = sctp6_disconnect,
1347         .pru_listen = sctp_listen,
1348         .pru_peeraddr = sctp6_getpeeraddr,
1349         .pru_send = sctp6_send,
1350         .pru_shutdown = sctp_shutdown,
1351         .pru_sockaddr = sctp6_in6getaddr,
1352         .pru_sosend = sctp_sosend,
1353         .pru_soreceive = sctp_soreceive
1354 };