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 (SCTP_OS_TIMER_PENDING(&net->pmtu_timer.timer)) {
 233                         timer_stopped = 1;
 234                         sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net,
 235                             SCTP_FROM_SCTP_USRREQ + SCTP_LOC_1);
 236                 } else {
 237                         timer_stopped = 0;
 238                 }
 239                 /* Update the path MTU. */
 240                 if (net->port) {
 241                         next_mtu -= sizeof(struct udphdr);
 242                 }
 243                 if (net->mtu > next_mtu) {
 244                         net->mtu = next_mtu;
 245                 }
 246                 /* Update the association MTU */
 247                 if (stcb->asoc.smallest_mtu > next_mtu) {
 248                         sctp_pathmtu_adjustment(stcb, next_mtu);
 249                 }
 250                 /* Finally, start the PMTU timer if it was running before. */
 251                 if (timer_stopped) {
 252                         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
 253                 }
 254                 SCTP_TCB_UNLOCK(stcb);
 255                 break;
 256         default:
 257                 SCTP_TCB_UNLOCK(stcb);
 258                 break;
 259         }
 260 }
 261
 262 void
 263 sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d)
 264 {
 265         struct ip6ctlparam *ip6cp;
 266         struct sctp_inpcb *inp;
 267         struct sctp_tcb *stcb;
 268         struct sctp_nets *net;
 269         struct sctphdr sh;
 270         struct sockaddr_in6 src, dst;
 271
 272         if (pktdst->sa_family != AF_INET6 ||
 273             pktdst->sa_len != sizeof(struct sockaddr_in6)) {
 274                 return;
 275         }
 276         if ((unsigned)cmd >= PRC_NCMDS) {
 277                 return;
 278         }
 279         if (PRC_IS_REDIRECT(cmd)) {
 280                 d = NULL;
 281         } else if (inet6ctlerrmap[cmd] == 0) {
 282                 return;
 283         }
 284         /* If the parameter is from icmp6, decode it. */
 285         if (d != NULL) {
 286                 ip6cp = (struct ip6ctlparam *)d;
 287         } else {
 288                 ip6cp = (struct ip6ctlparam *)NULL;
 289         }
 290
 291         if (ip6cp != NULL) {
 292                 /*
 293                  * XXX: We assume that when IPV6 is non NULL, M and OFF are
 294                  * valid.
 295                  */
 296                 if (ip6cp->ip6c_m == NULL) {
 297                         return;
 298                 }
 299                 /*
 300                  * Check if we can safely examine the ports and the
 301                  * verification tag of the SCTP common header.
 302                  */
 303                 if (ip6cp->ip6c_m->m_pkthdr.len <
 304                     (int32_t)(ip6cp->ip6c_off + offsetof(struct sctphdr, checksum))) {
 305                         return;
 306                 }
 307                 /* Copy out the port numbers and the verification tag. */
 308                 bzero(&sh, sizeof(sh));
 309                 m_copydata(ip6cp->ip6c_m,
 310                     ip6cp->ip6c_off,
 311                     sizeof(uint16_t) + sizeof(uint16_t) + sizeof(uint32_t),
 312                     (caddr_t)&sh);
 313                 memset(&src, 0, sizeof(struct sockaddr_in6));
 314                 src.sin6_family = AF_INET6;
 315                 src.sin6_len = sizeof(struct sockaddr_in6);
 316                 src.sin6_port = sh.src_port;
 317                 src.sin6_addr = ip6cp->ip6c_ip6->ip6_src;
 318                 if (in6_setscope(&src.sin6_addr, ip6cp->ip6c_m->m_pkthdr.rcvif, NULL) != 0) {
 319                         return;
 320                 }
 321                 memset(&dst, 0, sizeof(struct sockaddr_in6));
 322                 dst.sin6_family = AF_INET6;
 323                 dst.sin6_len = sizeof(struct sockaddr_in6);
 324                 dst.sin6_port = sh.dest_port;
 325                 dst.sin6_addr = ip6cp->ip6c_ip6->ip6_dst;
 326                 if (in6_setscope(&dst.sin6_addr, ip6cp->ip6c_m->m_pkthdr.rcvif, NULL) != 0) {
 327                         return;
 328                 }
 329                 inp = NULL;
 330                 net = NULL;
 331                 stcb = sctp_findassociation_addr_sa((struct sockaddr *)&dst,
 332                     (struct sockaddr *)&src,
 333                     &inp, &net, 1, SCTP_DEFAULT_VRFID);
 334                 if ((stcb != NULL) &&
 335                     (net != NULL) &&
 336                     (inp != NULL)) {
 337                         /* Check the verification tag */
 338                         if (ntohl(sh.v_tag) != 0) {
 339                                 /*
 340                                  * This must be the verification tag used
 341                                  * for sending out packets. We don't
 342                                  * consider packets reflecting the
 343                                  * verification tag.
 344                                  */
 345                                 if (ntohl(sh.v_tag) != stcb->asoc.peer_vtag) {
 346                                         SCTP_TCB_UNLOCK(stcb);
 347                                         return;
 348                                 }
 349                         } else {
 350                                 if (ip6cp->ip6c_m->m_pkthdr.len >=
 351                                     ip6cp->ip6c_off + sizeof(struct sctphdr) +
 352                                     sizeof(struct sctp_chunkhdr) +
 353                                     offsetof(struct sctp_init, a_rwnd)) {
 354                                         /*
 355                                          * In this case we can check if we
 356                                          * got an INIT chunk and if the
 357                                          * initiate tag matches.
 358                                          */
 359                                         uint32_t initiate_tag;
 360                                         uint8_t chunk_type;
 361
 362                                         m_copydata(ip6cp->ip6c_m,
 363                                             ip6cp->ip6c_off +
 364                                             sizeof(struct sctphdr),
 365                                             sizeof(uint8_t),
 366                                             (caddr_t)&chunk_type);
 367                                         m_copydata(ip6cp->ip6c_m,
 368                                             ip6cp->ip6c_off +
 369                                             sizeof(struct sctphdr) +
 370                                             sizeof(struct sctp_chunkhdr),
 371                                             sizeof(uint32_t),
 372                                             (caddr_t)&initiate_tag);
 373                                         if ((chunk_type != SCTP_INITIATION) ||
 374                                             (ntohl(initiate_tag) != stcb->asoc.my_vtag)) {
 375                                                 SCTP_TCB_UNLOCK(stcb);
 376                                                 return;
 377                                         }
 378                                 } else {
 379                                         SCTP_TCB_UNLOCK(stcb);
 380                                         return;
 381                                 }
 382                         }
 383                         sctp6_notify(inp, stcb, net,
 384                             ip6cp->ip6c_icmp6->icmp6_type,
 385                             ip6cp->ip6c_icmp6->icmp6_code,
 386                             ntohl(ip6cp->ip6c_icmp6->icmp6_mtu));
 387                 } else {
 388                         if ((stcb == NULL) && (inp != NULL)) {
 389                                 /* reduce inp's ref-count */
 390                                 SCTP_INP_WLOCK(inp);
 391                                 SCTP_INP_DECR_REF(inp);
 392                                 SCTP_INP_WUNLOCK(inp);
 393                         }
 394                         if (stcb) {
 395                                 SCTP_TCB_UNLOCK(stcb);
 396                         }
 397                 }
 398         }
 399 }
 400
 401 /*
 402  * this routine can probably be collasped into the one in sctp_userreq.c
 403  * since they do the same thing and now we lookup with a sockaddr
 404  */
 405 static int
 406 sctp6_getcred(SYSCTL_HANDLER_ARGS)
 407 {
 408         struct xucred xuc;
 409         struct sockaddr_in6 addrs[2];
 410         struct sctp_inpcb *inp;
 411         struct sctp_nets *net;
 412         struct sctp_tcb *stcb;
 413         int error;
 414         uint32_t vrf_id;
 415
 416         vrf_id = SCTP_DEFAULT_VRFID;
 417
 418         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 419         if (error)
 420                 return (error);
 421
 422         if (req->newlen != sizeof(addrs)) {
 423                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 424                 return (EINVAL);
 425         }
 426         if (req->oldlen != sizeof(struct ucred)) {
 427                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 428                 return (EINVAL);
 429         }
 430         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 431         if (error)
 432                 return (error);
 433
 434         stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[1]),
 435             sin6tosa(&addrs[0]),
 436             &inp, &net, 1, vrf_id);
 437         if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) {
 438                 if ((inp != NULL) && (stcb == NULL)) {
 439                         /* reduce ref-count */
 440                         SCTP_INP_WLOCK(inp);
 441                         SCTP_INP_DECR_REF(inp);
 442                         goto cred_can_cont;
 443                 }
 444                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 445                 error = ENOENT;
 446                 goto out;
 447         }
 448         SCTP_TCB_UNLOCK(stcb);
 449         /*
 450          * We use the write lock here, only since in the error leg we need
 451          * it. If we used RLOCK, then we would have to
 452          * wlock/decr/unlock/rlock. Which in theory could create a hole.
 453          * Better to use higher wlock.
 454          */
 455         SCTP_INP_WLOCK(inp);
 456 cred_can_cont:
 457         error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket);
 458         if (error) {
 459                 SCTP_INP_WUNLOCK(inp);
 460                 goto out;
 461         }
 462         cru2x(inp->sctp_socket->so_cred, &xuc);
 463         SCTP_INP_WUNLOCK(inp);
 464         error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 465 out:
 466         return (error);
 467 }
 468
 469 SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW,
 470     0, 0,
 471     sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection");
 472
 473
 474 /* This is the same as the sctp_abort() could be made common */
 475 static void
 476 sctp6_abort(struct socket *so)
 477 {
 478         struct sctp_inpcb *inp;
 479         uint32_t flags;
 480
 481         inp = (struct sctp_inpcb *)so->so_pcb;
 482         if (inp == NULL) {
 483                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 484                 return;
 485         }
 486 sctp_must_try_again:
 487         flags = inp->sctp_flags;
 488 #ifdef SCTP_LOG_CLOSING
 489         sctp_log_closing(inp, NULL, 17);
 490 #endif
 491         if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) &&
 492             (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) {
 493 #ifdef SCTP_LOG_CLOSING
 494                 sctp_log_closing(inp, NULL, 16);
 495 #endif
 496                 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT,
 497                     SCTP_CALLED_AFTER_CMPSET_OFCLOSE);
 498                 SOCK_LOCK(so);
 499                 SCTP_SB_CLEAR(so->so_snd);
 500                 /*
 501                  * same for the rcv ones, they are only here for the
 502                  * accounting/select.
 503                  */
 504                 SCTP_SB_CLEAR(so->so_rcv);
 505                 /* Now null out the reference, we are completely detached. */
 506                 so->so_pcb = NULL;
 507                 SOCK_UNLOCK(so);
 508         } else {
 509                 flags = inp->sctp_flags;
 510                 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) {
 511                         goto sctp_must_try_again;
 512                 }
 513         }
 514         return;
 515 }
 516
 517 static int
 518 sctp6_attach(struct socket *so, int proto SCTP_UNUSED, struct thread *p SCTP_UNUSED)
 519 {
 520         struct in6pcb *inp6;
 521         int error;
 522         struct sctp_inpcb *inp;
 523         uint32_t vrf_id = SCTP_DEFAULT_VRFID;
 524
 525         inp = (struct sctp_inpcb *)so->so_pcb;
 526         if (inp != NULL) {
 527                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 528                 return (EINVAL);
 529         }
 530         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 531                 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace));
 532                 if (error)
 533                         return (error);
 534         }
 535         error = sctp_inpcb_alloc(so, vrf_id);
 536         if (error)
 537                 return (error);
 538         inp = (struct sctp_inpcb *)so->so_pcb;
 539         SCTP_INP_WLOCK(inp);
 540         inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6;     /* I'm v6! */
 541         inp6 = (struct in6pcb *)inp;
 542
 543         inp6->inp_vflag |= INP_IPV6;
 544         inp6->in6p_hops = -1;   /* use kernel default */
 545         inp6->in6p_cksum = -1;  /* just to be sure */
 546 #ifdef INET
 547         /*
 548          * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6
 549          * socket as well, because the socket may be bound to an IPv6
 550          * wildcard address, which may match an IPv4-mapped IPv6 address.
 551          */
 552         inp6->inp_ip_ttl = MODULE_GLOBAL(ip_defttl);
 553 #endif
 554         SCTP_INP_WUNLOCK(inp);
 555         return (0);
 556 }
 557
 558 static int
 559 sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p)
 560 {
 561         struct sctp_inpcb *inp;
 562         struct in6pcb *inp6;
 563         int error;
 564         u_char vflagsav;
 565
 566         inp = (struct sctp_inpcb *)so->so_pcb;
 567         if (inp == NULL) {
 568                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 569                 return (EINVAL);
 570         }
 571         if (addr) {
 572                 switch (addr->sa_family) {
 573 #ifdef INET
 574                 case AF_INET:
 575                         if (addr->sa_len != sizeof(struct sockaddr_in)) {
 576                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 577                                 return (EINVAL);
 578                         }
 579                         break;
 580 #endif
 581 #ifdef INET6
 582                 case AF_INET6:
 583                         if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 584                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 585                                 return (EINVAL);
 586                         }
 587                         break;
 588 #endif
 589                 default:
 590                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 591                         return (EINVAL);
 592                 }
 593         }
 594         inp6 = (struct in6pcb *)inp;
 595         vflagsav = inp6->inp_vflag;
 596         inp6->inp_vflag &= ~INP_IPV4;
 597         inp6->inp_vflag |= INP_IPV6;
 598         if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp6) == 0)) {
 599                 switch (addr->sa_family) {
 600 #ifdef INET
 601                 case AF_INET:
 602                         /* binding v4 addr to v6 socket, so reset flags */
 603                         inp6->inp_vflag |= INP_IPV4;
 604                         inp6->inp_vflag &= ~INP_IPV6;
 605                         break;
 606 #endif
 607 #ifdef INET6
 608                 case AF_INET6:
 609                         {
 610                                 struct sockaddr_in6 *sin6_p;
 611
 612                                 sin6_p = (struct sockaddr_in6 *)addr;
 613
 614                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
 615                                         inp6->inp_vflag |= INP_IPV4;
 616                                 }
 617 #ifdef INET
 618                                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 619                                         struct sockaddr_in sin;
 620
 621                                         in6_sin6_2_sin(&sin, sin6_p);
 622                                         inp6->inp_vflag |= INP_IPV4;
 623                                         inp6->inp_vflag &= ~INP_IPV6;
 624                                         error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p);
 625                                         goto out;
 626                                 }
 627 #endif
 628                                 break;
 629                         }
 630 #endif
 631                 default:
 632                         break;
 633                 }
 634         } else if (addr != NULL) {
 635                 struct sockaddr_in6 *sin6_p;
 636
 637                 /* IPV6_V6ONLY socket */
 638 #ifdef INET
 639                 if (addr->sa_family == AF_INET) {
 640                         /* can't bind v4 addr to v6 only socket! */
 641                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 642                         error = EINVAL;
 643                         goto out;
 644                 }
 645 #endif
 646                 sin6_p = (struct sockaddr_in6 *)addr;
 647
 648                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 649                         /* can't bind v4-mapped addrs either! */
 650                         /* NOTE: we don't support SIIT */
 651                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 652                         error = EINVAL;
 653                         goto out;
 654                 }
 655         }
 656         error = sctp_inpcb_bind(so, addr, NULL, p);
 657 out:
 658         if (error != 0)
 659                 inp6->inp_vflag = vflagsav;
 660         return (error);
 661 }
 662
 663
 664 static void
 665 sctp6_close(struct socket *so)
 666 {
 667         sctp_close(so);
 668 }
 669
 670 /* This could be made common with sctp_detach() since they are identical */
 671
 672 static
 673 int
 674 sctp6_disconnect(struct socket *so)
 675 {
 676         return (sctp_disconnect(so));
 677 }
 678
 679
 680 int
 681 sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 682     struct mbuf *control, struct thread *p);
 683
 684
 685 static int
 686 sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 687     struct mbuf *control, struct thread *p)
 688 {
 689         struct sctp_inpcb *inp;
 690         struct in6pcb *inp6;
 691
 692 #ifdef INET
 693         struct sockaddr_in6 *sin6;
 694 #endif                          /* INET */
 695         /* No SPL needed since sctp_output does this */
 696
 697         inp = (struct sctp_inpcb *)so->so_pcb;
 698         if (inp == NULL) {
 699                 if (control) {
 700                         SCTP_RELEASE_PKT(control);
 701                         control = NULL;
 702                 }
 703                 SCTP_RELEASE_PKT(m);
 704                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 705                 return (EINVAL);
 706         }
 707         inp6 = (struct in6pcb *)inp;
 708         /*
 709          * For the TCP model we may get a NULL addr, if we are a connected
 710          * socket thats ok.
 711          */
 712         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) &&
 713             (addr == NULL)) {
 714                 goto connected_type;
 715         }
 716         if (addr == NULL) {
 717                 SCTP_RELEASE_PKT(m);
 718                 if (control) {
 719                         SCTP_RELEASE_PKT(control);
 720                         control = NULL;
 721                 }
 722                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ);
 723                 return (EDESTADDRREQ);
 724         }
 725 #ifdef INET
 726         sin6 = (struct sockaddr_in6 *)addr;
 727         if (SCTP_IPV6_V6ONLY(inp6)) {
 728                 /*
 729                  * if IPV6_V6ONLY flag, we discard datagrams destined to a
 730                  * v4 addr or v4-mapped addr
 731                  */
 732                 if (addr->sa_family == AF_INET) {
 733                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 734                         return (EINVAL);
 735                 }
 736                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 737                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 738                         return (EINVAL);
 739                 }
 740         }
 741         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 742                 struct sockaddr_in sin;
 743
 744                 /* convert v4-mapped into v4 addr and send */
 745                 in6_sin6_2_sin(&sin, sin6);
 746                 return (sctp_sendm(so, flags, m, (struct sockaddr *)&sin, control, p));
 747         }
 748 #endif                          /* INET */
 749 connected_type:
 750         /* now what about control */
 751         if (control) {
 752                 if (inp->control) {
 753                         SCTP_PRINTF("huh? control set?\n");
 754                         SCTP_RELEASE_PKT(inp->control);
 755                         inp->control = NULL;
 756                 }
 757                 inp->control = control;
 758         }
 759         /* Place the data */
 760         if (inp->pkt) {
 761                 SCTP_BUF_NEXT(inp->pkt_last) = m;
 762                 inp->pkt_last = m;
 763         } else {
 764                 inp->pkt_last = inp->pkt = m;
 765         }
 766         if (
 767         /* FreeBSD and MacOSX uses a flag passed */
 768             ((flags & PRUS_MORETOCOME) == 0)
 769             ) {
 770                 /*
 771                  * note with the current version this code will only be used
 772                  * by OpenBSD, NetBSD and FreeBSD have methods for
 773                  * re-defining sosend() to use sctp_sosend().  One can
 774                  * optionaly switch back to this code (by changing back the
 775                  * defininitions but this is not advisable.
 776                  */
 777                 int ret;
 778
 779                 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
 780                 inp->pkt = NULL;
 781                 inp->control = NULL;
 782                 return (ret);
 783         } else {
 784                 return (0);
 785         }
 786 }
 787
 788 static int
 789 sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
 790 {
 791         uint32_t vrf_id;
 792         int error = 0;
 793         struct sctp_inpcb *inp;
 794         struct sctp_tcb *stcb;
 795 #ifdef INET
 796         struct in6pcb *inp6;
 797         struct sockaddr_in6 *sin6;
 798         union sctp_sockstore store;
 799 #endif
 800
 801 #ifdef INET
 802         inp6 = (struct in6pcb *)so->so_pcb;
 803 #endif
 804         inp = (struct sctp_inpcb *)so->so_pcb;
 805         if (inp == NULL) {
 806                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 807                 return (ECONNRESET);    /* I made the same as TCP since we are
 808                                          * not setup? */
 809         }
 810         if (addr == NULL) {
 811                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 812                 return (EINVAL);
 813         }
 814         switch (addr->sa_family) {
 815 #ifdef INET
 816         case AF_INET:
 817                 if (addr->sa_len != sizeof(struct sockaddr_in)) {
 818                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 819                         return (EINVAL);
 820                 }
 821                 break;
 822 #endif
 823 #ifdef INET6
 824         case AF_INET6:
 825                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 826                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 827                         return (EINVAL);
 828                 }
 829                 break;
 830 #endif
 831         default:
 832                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 833                 return (EINVAL);
 834         }
 835
 836         vrf_id = inp->def_vrf_id;
 837         SCTP_ASOC_CREATE_LOCK(inp);
 838         SCTP_INP_RLOCK(inp);
 839         if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) ==
 840             SCTP_PCB_FLAGS_UNBOUND) {
 841                 /* Bind a ephemeral port */
 842                 SCTP_INP_RUNLOCK(inp);
 843                 error = sctp6_bind(so, NULL, p);
 844                 if (error) {
 845                         SCTP_ASOC_CREATE_UNLOCK(inp);
 846
 847                         return (error);
 848                 }
 849                 SCTP_INP_RLOCK(inp);
 850         }
 851         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
 852             (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) {
 853                 /* We are already connected AND the TCP model */
 854                 SCTP_INP_RUNLOCK(inp);
 855                 SCTP_ASOC_CREATE_UNLOCK(inp);
 856                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE);
 857                 return (EADDRINUSE);
 858         }
 859 #ifdef INET
 860         sin6 = (struct sockaddr_in6 *)addr;
 861         if (SCTP_IPV6_V6ONLY(inp6)) {
 862                 /*
 863                  * if IPV6_V6ONLY flag, ignore connections destined to a v4
 864                  * addr or v4-mapped addr
 865                  */
 866                 if (addr->sa_family == AF_INET) {
 867                         SCTP_INP_RUNLOCK(inp);
 868                         SCTP_ASOC_CREATE_UNLOCK(inp);
 869                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 870                         return (EINVAL);
 871                 }
 872                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 873                         SCTP_INP_RUNLOCK(inp);
 874                         SCTP_ASOC_CREATE_UNLOCK(inp);
 875                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 876                         return (EINVAL);
 877                 }
 878         }
 879         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 880                 /* convert v4-mapped into v4 addr */
 881                 in6_sin6_2_sin(&store.sin, sin6);
 882                 addr = &store.sa;
 883         }
 884 #endif                          /* INET */
 885         /* Now do we connect? */
 886         if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
 887                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
 888                 if (stcb) {
 889                         SCTP_TCB_UNLOCK(stcb);
 890                 }
 891                 SCTP_INP_RUNLOCK(inp);
 892         } else {
 893                 SCTP_INP_RUNLOCK(inp);
 894                 SCTP_INP_WLOCK(inp);
 895                 SCTP_INP_INCR_REF(inp);
 896                 SCTP_INP_WUNLOCK(inp);
 897                 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL);
 898                 if (stcb == NULL) {
 899                         SCTP_INP_WLOCK(inp);
 900                         SCTP_INP_DECR_REF(inp);
 901                         SCTP_INP_WUNLOCK(inp);
 902                 }
 903         }
 904
 905         if (stcb != NULL) {
 906                 /* Already have or am bring up an association */
 907                 SCTP_ASOC_CREATE_UNLOCK(inp);
 908                 SCTP_TCB_UNLOCK(stcb);
 909                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY);
 910                 return (EALREADY);
 911         }
 912         /* We are GOOD to go */
 913         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
 914             inp->sctp_ep.pre_open_stream_count,
 915             inp->sctp_ep.port, p);
 916         SCTP_ASOC_CREATE_UNLOCK(inp);
 917         if (stcb == NULL) {
 918                 /* Gak! no memory */
 919                 return (error);
 920         }
 921         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
 922                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
 923                 /* Set the connected flag so we can queue data */
 924                 soisconnecting(so);
 925         }
 926         stcb->asoc.state = SCTP_STATE_COOKIE_WAIT;
 927         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
 928
 929         /* initialize authentication parameters for the assoc */
 930         sctp_initialize_auth_params(inp, stcb);
 931
 932         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
 933         SCTP_TCB_UNLOCK(stcb);
 934         return (error);
 935 }
 936
 937 static int
 938 sctp6_getaddr(struct socket *so, struct sockaddr **addr)
 939 {
 940         struct sockaddr_in6 *sin6;
 941         struct sctp_inpcb *inp;
 942         uint32_t vrf_id;
 943         struct sctp_ifa *sctp_ifa;
 944
 945         int error;
 946
 947         /*
 948          * Do the malloc first in case it blocks.
 949          */
 950         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof(*sin6));
 951         if (sin6 == NULL)
 952                 return (ENOMEM);
 953         sin6->sin6_family = AF_INET6;
 954         sin6->sin6_len = sizeof(*sin6);
 955
 956         inp = (struct sctp_inpcb *)so->so_pcb;
 957         if (inp == NULL) {
 958                 SCTP_FREE_SONAME(sin6);
 959                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 960                 return (ECONNRESET);
 961         }
 962         SCTP_INP_RLOCK(inp);
 963         sin6->sin6_port = inp->sctp_lport;
 964         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
 965                 /* For the bound all case you get back 0 */
 966                 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
 967                         struct sctp_tcb *stcb;
 968                         struct sockaddr_in6 *sin_a6;
 969                         struct sctp_nets *net;
 970                         int fnd;
 971
 972                         stcb = LIST_FIRST(&inp->sctp_asoc_list);
 973                         if (stcb == NULL) {
 974                                 SCTP_INP_RUNLOCK(inp);
 975                                 SCTP_FREE_SONAME(sin6);
 976                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 977                                 return (ENOENT);
 978                         }
 979                         fnd = 0;
 980                         sin_a6 = NULL;
 981                         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 982                                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 983                                 if (sin_a6 == NULL)
 984                                         /* this will make coverity happy */
 985                                         continue;
 986
 987                                 if (sin_a6->sin6_family == AF_INET6) {
 988                                         fnd = 1;
 989                                         break;
 990                                 }
 991                         }
 992                         if ((!fnd) || (sin_a6 == NULL)) {
 993                                 /* punt */
 994                                 SCTP_INP_RUNLOCK(inp);
 995                                 SCTP_FREE_SONAME(sin6);
 996                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 997                                 return (ENOENT);
 998                         }
 999                         vrf_id = inp->def_vrf_id;
1000                         sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *)&net->ro, net, 0, vrf_id);
1001                         if (sctp_ifa) {
1002                                 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr;
1003                         }
1004                 } else {
1005                         /* For the bound all case you get back 0 */
1006                         memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr));
1007                 }
1008         } else {
1009                 /* Take the first IPv6 address in the list */
1010                 struct sctp_laddr *laddr;
1011                 int fnd = 0;
1012
1013                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
1014                         if (laddr->ifa->address.sa.sa_family == AF_INET6) {
1015                                 struct sockaddr_in6 *sin_a;
1016
1017                                 sin_a = &laddr->ifa->address.sin6;
1018                                 sin6->sin6_addr = sin_a->sin6_addr;
1019                                 fnd = 1;
1020                                 break;
1021                         }
1022                 }
1023                 if (!fnd) {
1024                         SCTP_FREE_SONAME(sin6);
1025                         SCTP_INP_RUNLOCK(inp);
1026                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1027                         return (ENOENT);
1028                 }
1029         }
1030         SCTP_INP_RUNLOCK(inp);
1031         /* Scoping things for v6 */
1032         if ((error = sa6_recoverscope(sin6)) != 0) {
1033                 SCTP_FREE_SONAME(sin6);
1034                 return (error);
1035         }
1036         (*addr) = (struct sockaddr *)sin6;
1037         return (0);
1038 }
1039
1040 static int
1041 sctp6_peeraddr(struct socket *so, struct sockaddr **addr)
1042 {
1043         struct sockaddr_in6 *sin6;
1044         int fnd;
1045         struct sockaddr_in6 *sin_a6;
1046         struct sctp_inpcb *inp;
1047         struct sctp_tcb *stcb;
1048         struct sctp_nets *net;
1049         int error;
1050
1051         /* Do the malloc first in case it blocks. */
1052         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1053         if (sin6 == NULL)
1054                 return (ENOMEM);
1055         sin6->sin6_family = AF_INET6;
1056         sin6->sin6_len = sizeof(*sin6);
1057
1058         inp = (struct sctp_inpcb *)so->so_pcb;
1059         if ((inp == NULL) ||
1060             ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
1061                 /* UDP type and listeners will drop out here */
1062                 SCTP_FREE_SONAME(sin6);
1063                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN);
1064                 return (ENOTCONN);
1065         }
1066         SCTP_INP_RLOCK(inp);
1067         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1068         if (stcb) {
1069                 SCTP_TCB_LOCK(stcb);
1070         }
1071         SCTP_INP_RUNLOCK(inp);
1072         if (stcb == NULL) {
1073                 SCTP_FREE_SONAME(sin6);
1074                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1075                 return (ECONNRESET);
1076         }
1077         fnd = 0;
1078         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1079                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1080                 if (sin_a6->sin6_family == AF_INET6) {
1081                         fnd = 1;
1082                         sin6->sin6_port = stcb->rport;
1083                         sin6->sin6_addr = sin_a6->sin6_addr;
1084                         break;
1085                 }
1086         }
1087         SCTP_TCB_UNLOCK(stcb);
1088         if (!fnd) {
1089                 /* No IPv4 address */
1090                 SCTP_FREE_SONAME(sin6);
1091                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1092                 return (ENOENT);
1093         }
1094         if ((error = sa6_recoverscope(sin6)) != 0) {
1095                 SCTP_FREE_SONAME(sin6);
1096                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, error);
1097                 return (error);
1098         }
1099         *addr = (struct sockaddr *)sin6;
1100         return (0);
1101 }
1102
1103 static int
1104 sctp6_in6getaddr(struct socket *so, struct sockaddr **nam)
1105 {
1106         struct in6pcb *inp6 = sotoin6pcb(so);
1107         int error;
1108
1109         if (inp6 == NULL) {
1110                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1111                 return (EINVAL);
1112         }
1113         /* allow v6 addresses precedence */
1114         error = sctp6_getaddr(so, nam);
1115 #ifdef INET
1116         if (error) {
1117                 struct sockaddr_in6 *sin6;
1118
1119                 /* try v4 next if v6 failed */
1120                 error = sctp_ingetaddr(so, nam);
1121                 if (error) {
1122                         return (error);
1123                 }
1124                 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1125                 if (sin6 == NULL) {
1126                         SCTP_FREE_SONAME(*nam);
1127                         return (ENOMEM);
1128                 }
1129                 in6_sin_2_v4mapsin6((struct sockaddr_in *)*nam, sin6);
1130                 SCTP_FREE_SONAME(*nam);
1131                 *nam = (struct sockaddr *)sin6;
1132         }
1133 #endif
1134         return (error);
1135 }
1136
1137
1138 static int
1139 sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
1140 {
1141         struct in6pcb *inp6 = sotoin6pcb(so);
1142         int error;
1143
1144         if (inp6 == NULL) {
1145                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1146                 return (EINVAL);
1147         }
1148         /* allow v6 addresses precedence */
1149         error = sctp6_peeraddr(so, nam);
1150 #ifdef INET
1151         if (error) {
1152                 struct sockaddr_in6 *sin6;
1153
1154                 /* try v4 next if v6 failed */
1155                 error = sctp_peeraddr(so, nam);
1156                 if (error) {
1157                         return (error);
1158                 }
1159                 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1160                 if (sin6 == NULL) {
1161                         SCTP_FREE_SONAME(*nam);
1162                         return (ENOMEM);
1163                 }
1164                 in6_sin_2_v4mapsin6((struct sockaddr_in *)*nam, sin6);
1165                 SCTP_FREE_SONAME(*nam);
1166                 *nam = (struct sockaddr *)sin6;
1167         }
1168 #endif
1169         return (error);
1170 }
1171
1172 struct pr_usrreqs sctp6_usrreqs = {
1173         .pru_abort = sctp6_abort,
1174         .pru_accept = sctp_accept,
1175         .pru_attach = sctp6_attach,
1176         .pru_bind = sctp6_bind,
1177         .pru_connect = sctp6_connect,
1178         .pru_control = in6_control,
1179         .pru_close = sctp6_close,
1180         .pru_detach = sctp6_close,
1181         .pru_sopoll = sopoll_generic,
1182         .pru_flush = sctp_flush,
1183         .pru_disconnect = sctp6_disconnect,
1184         .pru_listen = sctp_listen,
1185         .pru_peeraddr = sctp6_getpeeraddr,
1186         .pru_send = sctp6_send,
1187         .pru_shutdown = sctp_shutdown,
1188         .pru_sockaddr = sctp6_in6getaddr,
1189         .pru_sosend = sctp_sosend,
1190         .pru_soreceive = sctp_soreceive
1191 };
1192
1193 #endif