sys/netinet6/sctp6_usrreq.c

   1 /*-
   2  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2012, 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
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <netinet/sctp_os.h>
  37 #ifdef INET6
  38 #include <sys/proc.h>
  39 #include <netinet/sctp_pcb.h>
  40 #include <netinet/sctp_header.h>
  41 #include <netinet/sctp_var.h>
  42 #include <netinet6/sctp6_var.h>
  43 #include <netinet/sctp_sysctl.h>
  44 #include <netinet/sctp_output.h>
  45 #include <netinet/sctp_uio.h>
  46 #include <netinet/sctp_asconf.h>
  47 #include <netinet/sctputil.h>
  48 #include <netinet/sctp_indata.h>
  49 #include <netinet/sctp_timer.h>
  50 #include <netinet/sctp_auth.h>
  51 #include <netinet/sctp_input.h>
  52 #include <netinet/sctp_output.h>
  53 #include <netinet/sctp_bsd_addr.h>
  54 #include <netinet/sctp_crc32.h>
  55 #include <netinet/icmp6.h>
  56 #include <netinet/udp.h>
  57
  58 extern struct protosw inetsw[];
  59
  60 int
  61 sctp6_input_with_port(struct mbuf **i_pak, int *offp, uint16_t port)
  62 {
  63         struct mbuf *m;
  64         int iphlen;
  65         uint32_t vrf_id;
  66         uint8_t ecn_bits;
  67         struct sockaddr_in6 src, dst;
  68         struct ip6_hdr *ip6;
  69         struct sctphdr *sh;
  70         struct sctp_chunkhdr *ch;
  71         int length, offset;
  72 #if !defined(SCTP_WITH_NO_CSUM)
  73         uint8_t compute_crc;
  74 #endif
  75         uint32_t mflowid;
  76         uint8_t mflowtype;
  77         uint16_t fibnum;
  78
  79         iphlen = *offp;
  80         if (SCTP_GET_PKT_VRFID(*i_pak, vrf_id)) {
  81                 SCTP_RELEASE_PKT(*i_pak);
  82                 return (IPPROTO_DONE);
  83         }
  84         m = SCTP_HEADER_TO_CHAIN(*i_pak);
  85 #ifdef SCTP_MBUF_LOGGING
  86         /* Log in any input mbufs */
  87         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
  88                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
  89         }
  90 #endif
  91 #ifdef SCTP_PACKET_LOGGING
  92         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
  93                 sctp_packet_log(m);
  94         }
  95 #endif
  96         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
  97             "sctp6_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
  98             m->m_pkthdr.len,
  99             if_name(m->m_pkthdr.rcvif),
 100             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
 101         mflowid = m->m_pkthdr.flowid;
 102         mflowtype = M_HASHTYPE_GET(m);
 103         fibnum = M_GETFIB(m);
 104         SCTP_STAT_INCR(sctps_recvpackets);
 105         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
 106         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
 107         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
 108         ip6 = mtod(m, struct ip6_hdr *);
 109         IP6_EXTHDR_GET(sh, struct sctphdr *, m, iphlen,
 110             (int)(sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr)));
 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         offset -= sizeof(struct sctp_chunkhdr);
 117         memset(&src, 0, sizeof(struct sockaddr_in6));
 118         src.sin6_family = AF_INET6;
 119         src.sin6_len = sizeof(struct sockaddr_in6);
 120         src.sin6_port = sh->src_port;
 121         src.sin6_addr = ip6->ip6_src;
 122         if (in6_setscope(&src.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
 123                 goto out;
 124         }
 125         memset(&dst, 0, sizeof(struct sockaddr_in6));
 126         dst.sin6_family = AF_INET6;
 127         dst.sin6_len = sizeof(struct sockaddr_in6);
 128         dst.sin6_port = sh->dest_port;
 129         dst.sin6_addr = ip6->ip6_dst;
 130         if (in6_setscope(&dst.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
 131                 goto out;
 132         }
 133         length = ntohs(ip6->ip6_plen) + iphlen;
 134         /* Validate mbuf chain length with IP payload length. */
 135         if (SCTP_HEADER_LEN(m) != length) {
 136                 SCTPDBG(SCTP_DEBUG_INPUT1,
 137                     "sctp6_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
 138                 SCTP_STAT_INCR(sctps_hdrops);
 139                 goto out;
 140         }
 141         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 142                 goto out;
 143         }
 144         ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff);
 145 #if defined(SCTP_WITH_NO_CSUM)
 146         SCTP_STAT_INCR(sctps_recvnocrc);
 147 #else
 148         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
 149                 SCTP_STAT_INCR(sctps_recvhwcrc);
 150                 compute_crc = 0;
 151         } else {
 152                 SCTP_STAT_INCR(sctps_recvswcrc);
 153                 compute_crc = 1;
 154         }
 155 #endif
 156         sctp_common_input_processing(&m, iphlen, offset, length,
 157             (struct sockaddr *)&src,
 158             (struct sockaddr *)&dst,
 159             sh, ch,
 160 #if !defined(SCTP_WITH_NO_CSUM)
 161             compute_crc,
 162 #endif
 163             ecn_bits,
 164             mflowtype, mflowid, fibnum,
 165             vrf_id, port);
 166 out:
 167         if (m) {
 168                 sctp_m_freem(m);
 169         }
 170         return (IPPROTO_DONE);
 171 }
 172
 173
 174 int
 175 sctp6_input(struct mbuf **i_pak, int *offp, int proto SCTP_UNUSED)
 176 {
 177         return (sctp6_input_with_port(i_pak, offp, 0));
 178 }
 179
 180 void
 181 sctp6_notify(struct sctp_inpcb *inp,
 182     struct sctp_tcb *stcb,
 183     struct sctp_nets *net,
 184     uint8_t icmp6_type,
 185     uint8_t icmp6_code,
 186     uint32_t next_mtu)
 187 {
 188 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 189         struct socket *so;
 190 #endif
 191         int timer_stopped;
 192
 193         switch (icmp6_type) {
 194         case ICMP6_DST_UNREACH:
 195                 if ((icmp6_code == ICMP6_DST_UNREACH_NOROUTE) ||
 196                     (icmp6_code == ICMP6_DST_UNREACH_ADMIN) ||
 197                     (icmp6_code == ICMP6_DST_UNREACH_BEYONDSCOPE) ||
 198                     (icmp6_code == ICMP6_DST_UNREACH_ADDR)) {
 199                         /* Mark the net unreachable. */
 200                         if (net->dest_state & SCTP_ADDR_REACHABLE) {
 201                                 /* Ok that destination is not reachable */
 202                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
 203                                 net->dest_state &= ~SCTP_ADDR_PF;
 204                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
 205                                     stcb, 0, (void *)net, SCTP_SO_NOT_LOCKED);
 206                         }
 207                 }
 208                 SCTP_TCB_UNLOCK(stcb);
 209                 break;
 210         case ICMP6_PARAM_PROB:
 211                 /* Treat it like an ABORT. */
 212                 if (icmp6_code == ICMP6_PARAMPROB_NEXTHEADER) {
 213                         sctp_abort_notification(stcb, 1, 0, NULL, SCTP_SO_NOT_LOCKED);
 214 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 215                         so = SCTP_INP_SO(inp);
 216                         atomic_add_int(&stcb->asoc.refcnt, 1);
 217                         SCTP_TCB_UNLOCK(stcb);
 218                         SCTP_SOCKET_LOCK(so, 1);
 219                         SCTP_TCB_LOCK(stcb);
 220                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 221 #endif
 222                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
 223                             SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2);
 224 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 225                         SCTP_SOCKET_UNLOCK(so, 1);
 226 #endif
 227                 } else {
 228                         SCTP_TCB_UNLOCK(stcb);
 229                 }
 230                 break;
 231         case ICMP6_PACKET_TOO_BIG:
 232                 if ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0) {
 233                         SCTP_TCB_UNLOCK(stcb);
 234                         break;
 235                 }
 236                 if (SCTP_OS_TIMER_PENDING(&net->pmtu_timer.timer)) {
 237                         timer_stopped = 1;
 238                         sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net,
 239                             SCTP_FROM_SCTP_USRREQ + SCTP_LOC_1);
 240                 } else {
 241                         timer_stopped = 0;
 242                 }
 243                 /* Update the path MTU. */
 244                 if (net->port) {
 245                         next_mtu -= sizeof(struct udphdr);
 246                 }
 247                 if (net->mtu > next_mtu) {
 248                         net->mtu = next_mtu;
 249                 }
 250                 /* Update the association MTU */
 251                 if (stcb->asoc.smallest_mtu > next_mtu) {
 252                         sctp_pathmtu_adjustment(stcb, next_mtu);
 253                 }
 254                 /* Finally, start the PMTU timer if it was running before. */
 255                 if (timer_stopped) {
 256                         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
 257                 }
 258                 SCTP_TCB_UNLOCK(stcb);
 259                 break;
 260         default:
 261                 SCTP_TCB_UNLOCK(stcb);
 262                 break;
 263         }
 264 }
 265
 266 void
 267 sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d)
 268 {
 269         struct ip6ctlparam *ip6cp;
 270         struct sctp_inpcb *inp;
 271         struct sctp_tcb *stcb;
 272         struct sctp_nets *net;
 273         struct sctphdr sh;
 274         struct sockaddr_in6 src, dst;
 275
 276         if (pktdst->sa_family != AF_INET6 ||
 277             pktdst->sa_len != sizeof(struct sockaddr_in6)) {
 278                 return;
 279         }
 280         if ((unsigned)cmd >= PRC_NCMDS) {
 281                 return;
 282         }
 283         if (PRC_IS_REDIRECT(cmd)) {
 284                 d = NULL;
 285         } else if (inet6ctlerrmap[cmd] == 0) {
 286                 return;
 287         }
 288         /* If the parameter is from icmp6, decode it. */
 289         if (d != NULL) {
 290                 ip6cp = (struct ip6ctlparam *)d;
 291         } else {
 292                 ip6cp = (struct ip6ctlparam *)NULL;
 293         }
 294
 295         if (ip6cp != NULL) {
 296                 /*
 297                  * XXX: We assume that when IPV6 is non NULL, M and OFF are
 298                  * valid.
 299                  */
 300                 if (ip6cp->ip6c_m == NULL) {
 301                         return;
 302                 }
 303                 /*
 304                  * Check if we can safely examine the ports and the
 305                  * verification tag of the SCTP common header.
 306                  */
 307                 if (ip6cp->ip6c_m->m_pkthdr.len <
 308                     (int32_t)(ip6cp->ip6c_off + offsetof(struct sctphdr, checksum))) {
 309                         return;
 310                 }
 311                 /* Copy out the port numbers and the verification tag. */
 312                 memset(&sh, 0, sizeof(sh));
 313                 m_copydata(ip6cp->ip6c_m,
 314                     ip6cp->ip6c_off,
 315                     sizeof(uint16_t) + sizeof(uint16_t) + sizeof(uint32_t),
 316                     (caddr_t)&sh);
 317                 memset(&src, 0, sizeof(struct sockaddr_in6));
 318                 src.sin6_family = AF_INET6;
 319                 src.sin6_len = sizeof(struct sockaddr_in6);
 320                 src.sin6_port = sh.src_port;
 321                 src.sin6_addr = ip6cp->ip6c_ip6->ip6_src;
 322                 if (in6_setscope(&src.sin6_addr, ip6cp->ip6c_m->m_pkthdr.rcvif, NULL) != 0) {
 323                         return;
 324                 }
 325                 memset(&dst, 0, sizeof(struct sockaddr_in6));
 326                 dst.sin6_family = AF_INET6;
 327                 dst.sin6_len = sizeof(struct sockaddr_in6);
 328                 dst.sin6_port = sh.dest_port;
 329                 dst.sin6_addr = ip6cp->ip6c_ip6->ip6_dst;
 330                 if (in6_setscope(&dst.sin6_addr, ip6cp->ip6c_m->m_pkthdr.rcvif, NULL) != 0) {
 331                         return;
 332                 }
 333                 inp = NULL;
 334                 net = NULL;
 335                 stcb = sctp_findassociation_addr_sa((struct sockaddr *)&dst,
 336                     (struct sockaddr *)&src,
 337                     &inp, &net, 1, SCTP_DEFAULT_VRFID);
 338                 if ((stcb != NULL) &&
 339                     (net != NULL) &&
 340                     (inp != NULL)) {
 341                         /* Check the verification tag */
 342                         if (ntohl(sh.v_tag) != 0) {
 343                                 /*
 344                                  * This must be the verification tag used
 345                                  * for sending out packets. We don't
 346                                  * consider packets reflecting the
 347                                  * verification tag.
 348                                  */
 349                                 if (ntohl(sh.v_tag) != stcb->asoc.peer_vtag) {
 350                                         SCTP_TCB_UNLOCK(stcb);
 351                                         return;
 352                                 }
 353                         } else {
 354                                 if (ip6cp->ip6c_m->m_pkthdr.len >=
 355                                     ip6cp->ip6c_off + sizeof(struct sctphdr) +
 356                                     sizeof(struct sctp_chunkhdr) +
 357                                     offsetof(struct sctp_init, a_rwnd)) {
 358                                         /*
 359                                          * In this case we can check if we
 360                                          * got an INIT chunk and if the
 361                                          * initiate tag matches.
 362                                          */
 363                                         uint32_t initiate_tag;
 364                                         uint8_t chunk_type;
 365
 366                                         m_copydata(ip6cp->ip6c_m,
 367                                             ip6cp->ip6c_off +
 368                                             sizeof(struct sctphdr),
 369                                             sizeof(uint8_t),
 370                                             (caddr_t)&chunk_type);
 371                                         m_copydata(ip6cp->ip6c_m,
 372                                             ip6cp->ip6c_off +
 373                                             sizeof(struct sctphdr) +
 374                                             sizeof(struct sctp_chunkhdr),
 375                                             sizeof(uint32_t),
 376                                             (caddr_t)&initiate_tag);
 377                                         if ((chunk_type != SCTP_INITIATION) ||
 378                                             (ntohl(initiate_tag) != stcb->asoc.my_vtag)) {
 379                                                 SCTP_TCB_UNLOCK(stcb);
 380                                                 return;
 381                                         }
 382                                 } else {
 383                                         SCTP_TCB_UNLOCK(stcb);
 384                                         return;
 385                                 }
 386                         }
 387                         sctp6_notify(inp, stcb, net,
 388                             ip6cp->ip6c_icmp6->icmp6_type,
 389                             ip6cp->ip6c_icmp6->icmp6_code,
 390                             ntohl(ip6cp->ip6c_icmp6->icmp6_mtu));
 391                 } else {
 392                         if ((stcb == NULL) && (inp != NULL)) {
 393                                 /* reduce inp's ref-count */
 394                                 SCTP_INP_WLOCK(inp);
 395                                 SCTP_INP_DECR_REF(inp);
 396                                 SCTP_INP_WUNLOCK(inp);
 397                         }
 398                         if (stcb) {
 399                                 SCTP_TCB_UNLOCK(stcb);
 400                         }
 401                 }
 402         }
 403 }
 404
 405 /*
 406  * this routine can probably be collasped into the one in sctp_userreq.c
 407  * since they do the same thing and now we lookup with a sockaddr
 408  */
 409 static int
 410 sctp6_getcred(SYSCTL_HANDLER_ARGS)
 411 {
 412         struct xucred xuc;
 413         struct sockaddr_in6 addrs[2];
 414         struct sctp_inpcb *inp;
 415         struct sctp_nets *net;
 416         struct sctp_tcb *stcb;
 417         int error;
 418         uint32_t vrf_id;
 419
 420         vrf_id = SCTP_DEFAULT_VRFID;
 421
 422         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 423         if (error)
 424                 return (error);
 425
 426         if (req->newlen != sizeof(addrs)) {
 427                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 428                 return (EINVAL);
 429         }
 430         if (req->oldlen != sizeof(struct ucred)) {
 431                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 432                 return (EINVAL);
 433         }
 434         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 435         if (error)
 436                 return (error);
 437
 438         stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[1]),
 439             sin6tosa(&addrs[0]),
 440             &inp, &net, 1, vrf_id);
 441         if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) {
 442                 if ((inp != NULL) && (stcb == NULL)) {
 443                         /* reduce ref-count */
 444                         SCTP_INP_WLOCK(inp);
 445                         SCTP_INP_DECR_REF(inp);
 446                         goto cred_can_cont;
 447                 }
 448                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 449                 error = ENOENT;
 450                 goto out;
 451         }
 452         SCTP_TCB_UNLOCK(stcb);
 453         /*
 454          * We use the write lock here, only since in the error leg we need
 455          * it. If we used RLOCK, then we would have to
 456          * wlock/decr/unlock/rlock. Which in theory could create a hole.
 457          * Better to use higher wlock.
 458          */
 459         SCTP_INP_WLOCK(inp);
 460 cred_can_cont:
 461         error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket);
 462         if (error) {
 463                 SCTP_INP_WUNLOCK(inp);
 464                 goto out;
 465         }
 466         cru2x(inp->sctp_socket->so_cred, &xuc);
 467         SCTP_INP_WUNLOCK(inp);
 468         error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 469 out:
 470         return (error);
 471 }
 472
 473 SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW,
 474     0, 0,
 475     sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection");
 476
 477
 478 /* This is the same as the sctp_abort() could be made common */
 479 static void
 480 sctp6_abort(struct socket *so)
 481 {
 482         struct sctp_inpcb *inp;
 483         uint32_t flags;
 484
 485         inp = (struct sctp_inpcb *)so->so_pcb;
 486         if (inp == NULL) {
 487                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 488                 return;
 489         }
 490 sctp_must_try_again:
 491         flags = inp->sctp_flags;
 492 #ifdef SCTP_LOG_CLOSING
 493         sctp_log_closing(inp, NULL, 17);
 494 #endif
 495         if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) &&
 496             (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) {
 497 #ifdef SCTP_LOG_CLOSING
 498                 sctp_log_closing(inp, NULL, 16);
 499 #endif
 500                 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT,
 501                     SCTP_CALLED_AFTER_CMPSET_OFCLOSE);
 502                 SOCK_LOCK(so);
 503                 SCTP_SB_CLEAR(so->so_snd);
 504                 /*
 505                  * same for the rcv ones, they are only here for the
 506                  * accounting/select.
 507                  */
 508                 SCTP_SB_CLEAR(so->so_rcv);
 509                 /* Now null out the reference, we are completely detached. */
 510                 so->so_pcb = NULL;
 511                 SOCK_UNLOCK(so);
 512         } else {
 513                 flags = inp->sctp_flags;
 514                 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) {
 515                         goto sctp_must_try_again;
 516                 }
 517         }
 518         return;
 519 }
 520
 521 static int
 522 sctp6_attach(struct socket *so, int proto SCTP_UNUSED, struct thread *p SCTP_UNUSED)
 523 {
 524         struct in6pcb *inp6;
 525         int error;
 526         struct sctp_inpcb *inp;
 527         uint32_t vrf_id = SCTP_DEFAULT_VRFID;
 528
 529         inp = (struct sctp_inpcb *)so->so_pcb;
 530         if (inp != NULL) {
 531                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 532                 return (EINVAL);
 533         }
 534         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 535                 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace));
 536                 if (error)
 537                         return (error);
 538         }
 539         error = sctp_inpcb_alloc(so, vrf_id);
 540         if (error)
 541                 return (error);
 542         inp = (struct sctp_inpcb *)so->so_pcb;
 543         SCTP_INP_WLOCK(inp);
 544         inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6;     /* I'm v6! */
 545         inp6 = (struct in6pcb *)inp;
 546
 547         inp6->inp_vflag |= INP_IPV6;
 548         inp6->in6p_hops = -1;   /* use kernel default */
 549         inp6->in6p_cksum = -1;  /* just to be sure */
 550 #ifdef INET
 551         /*
 552          * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6
 553          * socket as well, because the socket may be bound to an IPv6
 554          * wildcard address, which may match an IPv4-mapped IPv6 address.
 555          */
 556         inp6->inp_ip_ttl = MODULE_GLOBAL(ip_defttl);
 557 #endif
 558         SCTP_INP_WUNLOCK(inp);
 559         return (0);
 560 }
 561
 562 static int
 563 sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p)
 564 {
 565         struct sctp_inpcb *inp;
 566         struct in6pcb *inp6;
 567         int error;
 568
 569         inp = (struct sctp_inpcb *)so->so_pcb;
 570         if (inp == NULL) {
 571                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 572                 return (EINVAL);
 573         }
 574         if (addr) {
 575                 switch (addr->sa_family) {
 576 #ifdef INET
 577                 case AF_INET:
 578                         if (addr->sa_len != sizeof(struct sockaddr_in)) {
 579                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 580                                 return (EINVAL);
 581                         }
 582                         break;
 583 #endif
 584 #ifdef INET6
 585                 case AF_INET6:
 586                         if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 587                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 588                                 return (EINVAL);
 589                         }
 590                         break;
 591 #endif
 592                 default:
 593                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 594                         return (EINVAL);
 595                 }
 596         }
 597         inp6 = (struct in6pcb *)inp;
 598         inp6->inp_vflag &= ~INP_IPV4;
 599         inp6->inp_vflag |= INP_IPV6;
 600         if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp6) == 0)) {
 601                 switch (addr->sa_family) {
 602 #ifdef INET
 603                 case AF_INET:
 604                         /* binding v4 addr to v6 socket, so reset flags */
 605                         inp6->inp_vflag |= INP_IPV4;
 606                         inp6->inp_vflag &= ~INP_IPV6;
 607                         break;
 608 #endif
 609 #ifdef INET6
 610                 case AF_INET6:
 611                         {
 612                                 struct sockaddr_in6 *sin6_p;
 613
 614                                 sin6_p = (struct sockaddr_in6 *)addr;
 615
 616                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
 617                                         inp6->inp_vflag |= INP_IPV4;
 618                                 }
 619 #ifdef INET
 620                                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 621                                         struct sockaddr_in sin;
 622
 623                                         in6_sin6_2_sin(&sin, sin6_p);
 624                                         inp6->inp_vflag |= INP_IPV4;
 625                                         inp6->inp_vflag &= ~INP_IPV6;
 626                                         error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p);
 627                                         return (error);
 628                                 }
 629 #endif
 630                                 break;
 631                         }
 632 #endif
 633                 default:
 634                         break;
 635                 }
 636         } else if (addr != NULL) {
 637                 struct sockaddr_in6 *sin6_p;
 638
 639                 /* IPV6_V6ONLY socket */
 640 #ifdef INET
 641                 if (addr->sa_family == AF_INET) {
 642                         /* can't bind v4 addr to v6 only socket! */
 643                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 644                         return (EINVAL);
 645                 }
 646 #endif
 647                 sin6_p = (struct sockaddr_in6 *)addr;
 648
 649                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 650                         /* can't bind v4-mapped addrs either! */
 651                         /* NOTE: we don't support SIIT */
 652                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 653                         return (EINVAL);
 654                 }
 655         }
 656         error = sctp_inpcb_bind(so, addr, NULL, p);
 657         return (error);
 658 }
 659
 660
 661 static void
 662 sctp6_close(struct socket *so)
 663 {
 664         sctp_close(so);
 665 }
 666
 667 /* This could be made common with sctp_detach() since they are identical */
 668
 669 static
 670 int
 671 sctp6_disconnect(struct socket *so)
 672 {
 673         return (sctp_disconnect(so));
 674 }
 675
 676
 677 int
 678 sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 679     struct mbuf *control, struct thread *p);
 680
 681
 682 static int
 683 sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 684     struct mbuf *control, struct thread *p)
 685 {
 686         struct sctp_inpcb *inp;
 687         struct in6pcb *inp6;
 688
 689 #ifdef INET
 690         struct sockaddr_in6 *sin6;
 691 #endif                          /* INET */
 692         /* No SPL needed since sctp_output does this */
 693
 694         inp = (struct sctp_inpcb *)so->so_pcb;
 695         if (inp == NULL) {
 696                 if (control) {
 697                         SCTP_RELEASE_PKT(control);
 698                         control = NULL;
 699                 }
 700                 SCTP_RELEASE_PKT(m);
 701                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 702                 return (EINVAL);
 703         }
 704         inp6 = (struct in6pcb *)inp;
 705         /*
 706          * For the TCP model we may get a NULL addr, if we are a connected
 707          * socket thats ok.
 708          */
 709         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) &&
 710             (addr == NULL)) {
 711                 goto connected_type;
 712         }
 713         if (addr == NULL) {
 714                 SCTP_RELEASE_PKT(m);
 715                 if (control) {
 716                         SCTP_RELEASE_PKT(control);
 717                         control = NULL;
 718                 }
 719                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ);
 720                 return (EDESTADDRREQ);
 721         }
 722 #ifdef INET
 723         sin6 = (struct sockaddr_in6 *)addr;
 724         if (SCTP_IPV6_V6ONLY(inp6)) {
 725                 /*
 726                  * if IPV6_V6ONLY flag, we discard datagrams destined to a
 727                  * v4 addr or v4-mapped addr
 728                  */
 729                 if (addr->sa_family == AF_INET) {
 730                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 731                         return (EINVAL);
 732                 }
 733                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 734                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 735                         return (EINVAL);
 736                 }
 737         }
 738         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 739                 struct sockaddr_in sin;
 740
 741                 /* convert v4-mapped into v4 addr and send */
 742                 in6_sin6_2_sin(&sin, sin6);
 743                 return (sctp_sendm(so, flags, m, (struct sockaddr *)&sin, control, p));
 744         }
 745 #endif                          /* INET */
 746 connected_type:
 747         /* now what about control */
 748         if (control) {
 749                 if (inp->control) {
 750                         SCTP_PRINTF("huh? control set?\n");
 751                         SCTP_RELEASE_PKT(inp->control);
 752                         inp->control = NULL;
 753                 }
 754                 inp->control = control;
 755         }
 756         /* Place the data */
 757         if (inp->pkt) {
 758                 SCTP_BUF_NEXT(inp->pkt_last) = m;
 759                 inp->pkt_last = m;
 760         } else {
 761                 inp->pkt_last = inp->pkt = m;
 762         }
 763         if (
 764         /* FreeBSD and MacOSX uses a flag passed */
 765             ((flags & PRUS_MORETOCOME) == 0)
 766             ) {
 767                 /*
 768                  * note with the current version this code will only be used
 769                  * by OpenBSD, NetBSD and FreeBSD have methods for
 770                  * re-defining sosend() to use sctp_sosend().  One can
 771                  * optionaly switch back to this code (by changing back the
 772                  * defininitions but this is not advisable.
 773                  */
 774                 int ret;
 775
 776                 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
 777                 inp->pkt = NULL;
 778                 inp->control = NULL;
 779                 return (ret);
 780         } else {
 781                 return (0);
 782         }
 783 }
 784
 785 static int
 786 sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
 787 {
 788         uint32_t vrf_id;
 789         int error = 0;
 790         struct sctp_inpcb *inp;
 791         struct sctp_tcb *stcb;
 792 #ifdef INET
 793         struct in6pcb *inp6;
 794         struct sockaddr_in6 *sin6;
 795         union sctp_sockstore store;
 796 #endif
 797
 798 #ifdef INET
 799         inp6 = (struct in6pcb *)so->so_pcb;
 800 #endif
 801         inp = (struct sctp_inpcb *)so->so_pcb;
 802         if (inp == NULL) {
 803                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 804                 return (ECONNRESET);    /* I made the same as TCP since we are
 805                                          * not setup? */
 806         }
 807         if (addr == NULL) {
 808                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 809                 return (EINVAL);
 810         }
 811         switch (addr->sa_family) {
 812 #ifdef INET
 813         case AF_INET:
 814                 if (addr->sa_len != sizeof(struct sockaddr_in)) {
 815                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 816                         return (EINVAL);
 817                 }
 818                 break;
 819 #endif
 820 #ifdef INET6
 821         case AF_INET6:
 822                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 823                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 824                         return (EINVAL);
 825                 }
 826                 break;
 827 #endif
 828         default:
 829                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 830                 return (EINVAL);
 831         }
 832
 833         vrf_id = inp->def_vrf_id;
 834         SCTP_ASOC_CREATE_LOCK(inp);
 835         SCTP_INP_RLOCK(inp);
 836         if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) ==
 837             SCTP_PCB_FLAGS_UNBOUND) {
 838                 /* Bind a ephemeral port */
 839                 SCTP_INP_RUNLOCK(inp);
 840                 error = sctp6_bind(so, NULL, p);
 841                 if (error) {
 842                         SCTP_ASOC_CREATE_UNLOCK(inp);
 843
 844                         return (error);
 845                 }
 846                 SCTP_INP_RLOCK(inp);
 847         }
 848         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
 849             (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) {
 850                 /* We are already connected AND the TCP model */
 851                 SCTP_INP_RUNLOCK(inp);
 852                 SCTP_ASOC_CREATE_UNLOCK(inp);
 853                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE);
 854                 return (EADDRINUSE);
 855         }
 856 #ifdef INET
 857         sin6 = (struct sockaddr_in6 *)addr;
 858         if (SCTP_IPV6_V6ONLY(inp6)) {
 859                 /*
 860                  * if IPV6_V6ONLY flag, ignore connections destined to a v4
 861                  * addr or v4-mapped addr
 862                  */
 863                 if (addr->sa_family == AF_INET) {
 864                         SCTP_INP_RUNLOCK(inp);
 865                         SCTP_ASOC_CREATE_UNLOCK(inp);
 866                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 867                         return (EINVAL);
 868                 }
 869                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 870                         SCTP_INP_RUNLOCK(inp);
 871                         SCTP_ASOC_CREATE_UNLOCK(inp);
 872                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 873                         return (EINVAL);
 874                 }
 875         }
 876         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 877                 /* convert v4-mapped into v4 addr */
 878                 in6_sin6_2_sin(&store.sin, sin6);
 879                 addr = &store.sa;
 880         }
 881 #endif                          /* INET */
 882         /* Now do we connect? */
 883         if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
 884                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
 885                 if (stcb) {
 886                         SCTP_TCB_LOCK(stcb);
 887                 }
 888                 SCTP_INP_RUNLOCK(inp);
 889         } else {
 890                 SCTP_INP_RUNLOCK(inp);
 891                 SCTP_INP_WLOCK(inp);
 892                 SCTP_INP_INCR_REF(inp);
 893                 SCTP_INP_WUNLOCK(inp);
 894                 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL);
 895                 if (stcb == NULL) {
 896                         SCTP_INP_WLOCK(inp);
 897                         SCTP_INP_DECR_REF(inp);
 898                         SCTP_INP_WUNLOCK(inp);
 899                 }
 900         }
 901
 902         if (stcb != NULL) {
 903                 /* Already have or am bring up an association */
 904                 SCTP_ASOC_CREATE_UNLOCK(inp);
 905                 SCTP_TCB_UNLOCK(stcb);
 906                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY);
 907                 return (EALREADY);
 908         }
 909         /* We are GOOD to go */
 910         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
 911             inp->sctp_ep.pre_open_stream_count,
 912             inp->sctp_ep.port, p);
 913         SCTP_ASOC_CREATE_UNLOCK(inp);
 914         if (stcb == NULL) {
 915                 /* Gak! no memory */
 916                 return (error);
 917         }
 918         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
 919                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
 920                 /* Set the connected flag so we can queue data */
 921                 soisconnecting(so);
 922         }
 923         stcb->asoc.state = SCTP_STATE_COOKIE_WAIT;
 924         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
 925
 926         /* initialize authentication parameters for the assoc */
 927         sctp_initialize_auth_params(inp, stcb);
 928
 929         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
 930         SCTP_TCB_UNLOCK(stcb);
 931         return (error);
 932 }
 933
 934 static int
 935 sctp6_getaddr(struct socket *so, struct sockaddr **addr)
 936 {
 937         struct sockaddr_in6 *sin6;
 938         struct sctp_inpcb *inp;
 939         uint32_t vrf_id;
 940         struct sctp_ifa *sctp_ifa;
 941
 942         int error;
 943
 944         /*
 945          * Do the malloc first in case it blocks.
 946          */
 947         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof(*sin6));
 948         if (sin6 == NULL)
 949                 return (ENOMEM);
 950         sin6->sin6_family = AF_INET6;
 951         sin6->sin6_len = sizeof(*sin6);
 952
 953         inp = (struct sctp_inpcb *)so->so_pcb;
 954         if (inp == NULL) {
 955                 SCTP_FREE_SONAME(sin6);
 956                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 957                 return (ECONNRESET);
 958         }
 959         SCTP_INP_RLOCK(inp);
 960         sin6->sin6_port = inp->sctp_lport;
 961         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
 962                 /* For the bound all case you get back 0 */
 963                 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
 964                         struct sctp_tcb *stcb;
 965                         struct sockaddr_in6 *sin_a6;
 966                         struct sctp_nets *net;
 967                         int fnd;
 968
 969                         stcb = LIST_FIRST(&inp->sctp_asoc_list);
 970                         if (stcb == NULL) {
 971                                 SCTP_INP_RUNLOCK(inp);
 972                                 SCTP_FREE_SONAME(sin6);
 973                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 974                                 return (ENOENT);
 975                         }
 976                         fnd = 0;
 977                         sin_a6 = NULL;
 978                         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 979                                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 980                                 if (sin_a6 == NULL)
 981                                         /* this will make coverity happy */
 982                                         continue;
 983
 984                                 if (sin_a6->sin6_family == AF_INET6) {
 985                                         fnd = 1;
 986                                         break;
 987                                 }
 988                         }
 989                         if ((!fnd) || (sin_a6 == NULL)) {
 990                                 /* punt */
 991                                 SCTP_INP_RUNLOCK(inp);
 992                                 SCTP_FREE_SONAME(sin6);
 993                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 994                                 return (ENOENT);
 995                         }
 996                         vrf_id = inp->def_vrf_id;
 997                         sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *)&net->ro, net, 0, vrf_id);
 998                         if (sctp_ifa) {
 999                                 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr;
1000                         }
1001                 } else {
1002                         /* For the bound all case you get back 0 */
1003                         memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr));
1004                 }
1005         } else {
1006                 /* Take the first IPv6 address in the list */
1007                 struct sctp_laddr *laddr;
1008                 int fnd = 0;
1009
1010                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
1011                         if (laddr->ifa->address.sa.sa_family == AF_INET6) {
1012                                 struct sockaddr_in6 *sin_a;
1013
1014                                 sin_a = &laddr->ifa->address.sin6;
1015                                 sin6->sin6_addr = sin_a->sin6_addr;
1016                                 fnd = 1;
1017                                 break;
1018                         }
1019                 }
1020                 if (!fnd) {
1021                         SCTP_FREE_SONAME(sin6);
1022                         SCTP_INP_RUNLOCK(inp);
1023                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1024                         return (ENOENT);
1025                 }
1026         }
1027         SCTP_INP_RUNLOCK(inp);
1028         /* Scoping things for v6 */
1029         if ((error = sa6_recoverscope(sin6)) != 0) {
1030                 SCTP_FREE_SONAME(sin6);
1031                 return (error);
1032         }
1033         (*addr) = (struct sockaddr *)sin6;
1034         return (0);
1035 }
1036
1037 static int
1038 sctp6_peeraddr(struct socket *so, struct sockaddr **addr)
1039 {
1040         struct sockaddr_in6 *sin6;
1041         int fnd;
1042         struct sockaddr_in6 *sin_a6;
1043         struct sctp_inpcb *inp;
1044         struct sctp_tcb *stcb;
1045         struct sctp_nets *net;
1046         int error;
1047
1048         /* Do the malloc first in case it blocks. */
1049         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1050         if (sin6 == NULL)
1051                 return (ENOMEM);
1052         sin6->sin6_family = AF_INET6;
1053         sin6->sin6_len = sizeof(*sin6);
1054
1055         inp = (struct sctp_inpcb *)so->so_pcb;
1056         if ((inp == NULL) ||
1057             ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
1058                 /* UDP type and listeners will drop out here */
1059                 SCTP_FREE_SONAME(sin6);
1060                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN);
1061                 return (ENOTCONN);
1062         }
1063         SCTP_INP_RLOCK(inp);
1064         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1065         if (stcb) {
1066                 SCTP_TCB_LOCK(stcb);
1067         }
1068         SCTP_INP_RUNLOCK(inp);
1069         if (stcb == NULL) {
1070                 SCTP_FREE_SONAME(sin6);
1071                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1072                 return (ECONNRESET);
1073         }
1074         fnd = 0;
1075         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1076                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1077                 if (sin_a6->sin6_family == AF_INET6) {
1078                         fnd = 1;
1079                         sin6->sin6_port = stcb->rport;
1080                         sin6->sin6_addr = sin_a6->sin6_addr;
1081                         break;
1082                 }
1083         }
1084         SCTP_TCB_UNLOCK(stcb);
1085         if (!fnd) {
1086                 /* No IPv4 address */
1087                 SCTP_FREE_SONAME(sin6);
1088                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1089                 return (ENOENT);
1090         }
1091         if ((error = sa6_recoverscope(sin6)) != 0) {
1092                 SCTP_FREE_SONAME(sin6);
1093                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, error);
1094                 return (error);
1095         }
1096         *addr = (struct sockaddr *)sin6;
1097         return (0);
1098 }
1099
1100 static int
1101 sctp6_in6getaddr(struct socket *so, struct sockaddr **nam)
1102 {
1103         struct in6pcb *inp6 = sotoin6pcb(so);
1104         int error;
1105
1106         if (inp6 == NULL) {
1107                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1108                 return (EINVAL);
1109         }
1110         /* allow v6 addresses precedence */
1111         error = sctp6_getaddr(so, nam);
1112 #ifdef INET
1113         if (error) {
1114                 struct sockaddr_in6 *sin6;
1115
1116                 /* try v4 next if v6 failed */
1117                 error = sctp_ingetaddr(so, nam);
1118                 if (error) {
1119                         return (error);
1120                 }
1121                 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1122                 if (sin6 == NULL) {
1123                         SCTP_FREE_SONAME(*nam);
1124                         return (ENOMEM);
1125                 }
1126                 in6_sin_2_v4mapsin6((struct sockaddr_in *)*nam, sin6);
1127                 SCTP_FREE_SONAME(*nam);
1128                 *nam = (struct sockaddr *)sin6;
1129         }
1130 #endif
1131         return (error);
1132 }
1133
1134
1135 static int
1136 sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
1137 {
1138         struct in6pcb *inp6 = sotoin6pcb(so);
1139         int error;
1140
1141         if (inp6 == NULL) {
1142                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1143                 return (EINVAL);
1144         }
1145         /* allow v6 addresses precedence */
1146         error = sctp6_peeraddr(so, nam);
1147 #ifdef INET
1148         if (error) {
1149                 struct sockaddr_in6 *sin6;
1150
1151                 /* try v4 next if v6 failed */
1152                 error = sctp_peeraddr(so, nam);
1153                 if (error) {
1154                         return (error);
1155                 }
1156                 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1157                 if (sin6 == NULL) {
1158                         SCTP_FREE_SONAME(*nam);
1159                         return (ENOMEM);
1160                 }
1161                 in6_sin_2_v4mapsin6((struct sockaddr_in *)*nam, sin6);
1162                 SCTP_FREE_SONAME(*nam);
1163                 *nam = (struct sockaddr *)sin6;
1164         }
1165 #endif
1166         return (error);
1167 }
1168
1169 struct pr_usrreqs sctp6_usrreqs = {
1170         .pru_abort = sctp6_abort,
1171         .pru_accept = sctp_accept,
1172         .pru_attach = sctp6_attach,
1173         .pru_bind = sctp6_bind,
1174         .pru_connect = sctp6_connect,
1175         .pru_control = in6_control,
1176         .pru_close = sctp6_close,
1177         .pru_detach = sctp6_close,
1178         .pru_sopoll = sopoll_generic,
1179         .pru_flush = sctp_flush,
1180         .pru_disconnect = sctp6_disconnect,
1181         .pru_listen = sctp_listen,
1182         .pru_peeraddr = sctp6_getpeeraddr,
1183         .pru_send = sctp6_send,
1184         .pru_shutdown = sctp_shutdown,
1185         .pru_sockaddr = sctp6_in6getaddr,
1186         .pru_sosend = sctp_sosend,
1187         .pru_soreceive = sctp_soreceive
1188 };
1189
1190 #endif