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         uint8_t compute_crc;
  73         uint32_t mflowid;
  74         uint8_t mflowtype;
  75         uint16_t fibnum;
  76
  77         iphlen = *offp;
  78         if (SCTP_GET_PKT_VRFID(*i_pak, vrf_id)) {
  79                 SCTP_RELEASE_PKT(*i_pak);
  80                 return (IPPROTO_DONE);
  81         }
  82         m = SCTP_HEADER_TO_CHAIN(*i_pak);
  83 #ifdef SCTP_MBUF_LOGGING
  84         /* Log in any input mbufs */
  85         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
  86                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
  87         }
  88 #endif
  89 #ifdef SCTP_PACKET_LOGGING
  90         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
  91                 sctp_packet_log(m);
  92         }
  93 #endif
  94         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
  95             "sctp6_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
  96             m->m_pkthdr.len,
  97             if_name(m->m_pkthdr.rcvif),
  98             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
  99         mflowid = m->m_pkthdr.flowid;
 100         mflowtype = M_HASHTYPE_GET(m);
 101         fibnum = M_GETFIB(m);
 102         SCTP_STAT_INCR(sctps_recvpackets);
 103         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
 104         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
 105         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
 106         ip6 = mtod(m, struct ip6_hdr *);
 107         IP6_EXTHDR_GET(sh, struct sctphdr *, m, iphlen,
 108             (int)(sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr)));
 109         if (sh == NULL) {
 110                 SCTP_STAT_INCR(sctps_hdrops);
 111                 return (IPPROTO_DONE);
 112         }
 113         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
 114         offset -= sizeof(struct sctp_chunkhdr);
 115         memset(&src, 0, sizeof(struct sockaddr_in6));
 116         src.sin6_family = AF_INET6;
 117         src.sin6_len = sizeof(struct sockaddr_in6);
 118         src.sin6_port = sh->src_port;
 119         src.sin6_addr = ip6->ip6_src;
 120         if (in6_setscope(&src.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
 121                 goto out;
 122         }
 123         memset(&dst, 0, sizeof(struct sockaddr_in6));
 124         dst.sin6_family = AF_INET6;
 125         dst.sin6_len = sizeof(struct sockaddr_in6);
 126         dst.sin6_port = sh->dest_port;
 127         dst.sin6_addr = ip6->ip6_dst;
 128         if (in6_setscope(&dst.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
 129                 goto out;
 130         }
 131         length = ntohs(ip6->ip6_plen) + iphlen;
 132         /* Validate mbuf chain length with IP payload length. */
 133         if (SCTP_HEADER_LEN(m) != length) {
 134                 SCTPDBG(SCTP_DEBUG_INPUT1,
 135                     "sctp6_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
 136                 SCTP_STAT_INCR(sctps_hdrops);
 137                 goto out;
 138         }
 139         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 140                 goto out;
 141         }
 142         ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff);
 143         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
 144                 SCTP_STAT_INCR(sctps_recvhwcrc);
 145                 compute_crc = 0;
 146         } else {
 147                 SCTP_STAT_INCR(sctps_recvswcrc);
 148                 compute_crc = 1;
 149         }
 150         sctp_common_input_processing(&m, iphlen, offset, length,
 151             (struct sockaddr *)&src,
 152             (struct sockaddr *)&dst,
 153             sh, ch,
 154             compute_crc,
 155             ecn_bits,
 156             mflowtype, mflowid, fibnum,
 157             vrf_id, port);
 158 out:
 159         if (m) {
 160                 sctp_m_freem(m);
 161         }
 162         return (IPPROTO_DONE);
 163 }
 164
 165
 166 int
 167 sctp6_input(struct mbuf **i_pak, int *offp, int proto SCTP_UNUSED)
 168 {
 169         return (sctp6_input_with_port(i_pak, offp, 0));
 170 }
 171
 172 void
 173 sctp6_notify(struct sctp_inpcb *inp,
 174     struct sctp_tcb *stcb,
 175     struct sctp_nets *net,
 176     uint8_t icmp6_type,
 177     uint8_t icmp6_code,
 178     uint32_t next_mtu)
 179 {
 180 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 181         struct socket *so;
 182 #endif
 183         int timer_stopped;
 184
 185         switch (icmp6_type) {
 186         case ICMP6_DST_UNREACH:
 187                 if ((icmp6_code == ICMP6_DST_UNREACH_NOROUTE) ||
 188                     (icmp6_code == ICMP6_DST_UNREACH_ADMIN) ||
 189                     (icmp6_code == ICMP6_DST_UNREACH_BEYONDSCOPE) ||
 190                     (icmp6_code == ICMP6_DST_UNREACH_ADDR)) {
 191                         /* Mark the net unreachable. */
 192                         if (net->dest_state & SCTP_ADDR_REACHABLE) {
 193                                 /* Ok that destination is not reachable */
 194                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
 195                                 net->dest_state &= ~SCTP_ADDR_PF;
 196                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
 197                                     stcb, 0, (void *)net, SCTP_SO_NOT_LOCKED);
 198                         }
 199                 }
 200                 SCTP_TCB_UNLOCK(stcb);
 201                 break;
 202         case ICMP6_PARAM_PROB:
 203                 /* Treat it like an ABORT. */
 204                 if (icmp6_code == ICMP6_PARAMPROB_NEXTHEADER) {
 205                         sctp_abort_notification(stcb, 1, 0, NULL, SCTP_SO_NOT_LOCKED);
 206 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 207                         so = SCTP_INP_SO(inp);
 208                         atomic_add_int(&stcb->asoc.refcnt, 1);
 209                         SCTP_TCB_UNLOCK(stcb);
 210                         SCTP_SOCKET_LOCK(so, 1);
 211                         SCTP_TCB_LOCK(stcb);
 212                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 213 #endif
 214                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
 215                             SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2);
 216 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 217                         SCTP_SOCKET_UNLOCK(so, 1);
 218 #endif
 219                 } else {
 220                         SCTP_TCB_UNLOCK(stcb);
 221                 }
 222                 break;
 223         case ICMP6_PACKET_TOO_BIG:
 224                 if (net->dest_state & SCTP_ADDR_NO_PMTUD) {
 225                         SCTP_TCB_UNLOCK(stcb);
 226                         break;
 227                 }
 228                 if (SCTP_OS_TIMER_PENDING(&net->pmtu_timer.timer)) {
 229                         timer_stopped = 1;
 230                         sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net,
 231                             SCTP_FROM_SCTP_USRREQ + SCTP_LOC_1);
 232                 } else {
 233                         timer_stopped = 0;
 234                 }
 235                 /* Update the path MTU. */
 236                 if (net->port) {
 237                         next_mtu -= sizeof(struct udphdr);
 238                 }
 239                 if (net->mtu > next_mtu) {
 240                         net->mtu = next_mtu;
 241                 }
 242                 /* Update the association MTU */
 243                 if (stcb->asoc.smallest_mtu > next_mtu) {
 244                         sctp_pathmtu_adjustment(stcb, next_mtu);
 245                 }
 246                 /* Finally, start the PMTU timer if it was running before. */
 247                 if (timer_stopped) {
 248                         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
 249                 }
 250                 SCTP_TCB_UNLOCK(stcb);
 251                 break;
 252         default:
 253                 SCTP_TCB_UNLOCK(stcb);
 254                 break;
 255         }
 256 }
 257
 258 void
 259 sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d)
 260 {
 261         struct ip6ctlparam *ip6cp;
 262         struct sctp_inpcb *inp;
 263         struct sctp_tcb *stcb;
 264         struct sctp_nets *net;
 265         struct sctphdr sh;
 266         struct sockaddr_in6 src, dst;
 267
 268         if (pktdst->sa_family != AF_INET6 ||
 269             pktdst->sa_len != sizeof(struct sockaddr_in6)) {
 270                 return;
 271         }
 272
 273         if ((unsigned)cmd >= PRC_NCMDS) {
 274                 return;
 275         }
 276         if (PRC_IS_REDIRECT(cmd)) {
 277                 d = NULL;
 278         } else if (inet6ctlerrmap[cmd] == 0) {
 279                 return;
 280         }
 281         /* If the parameter is from icmp6, decode it. */
 282         if (d != NULL) {
 283                 ip6cp = (struct ip6ctlparam *)d;
 284         } else {
 285                 ip6cp = (struct ip6ctlparam *)NULL;
 286         }
 287
 288         if (ip6cp != NULL) {
 289                 /*
 290                  * XXX: We assume that when IPV6 is non NULL, M and OFF are
 291                  * valid.
 292                  */
 293                 if (ip6cp->ip6c_m == NULL) {
 294                         return;
 295                 }
 296
 297                 /*
 298                  * Check if we can safely examine the ports and the
 299                  * verification tag of the SCTP common header.
 300                  */
 301                 if (ip6cp->ip6c_m->m_pkthdr.len <
 302                     (int32_t)(ip6cp->ip6c_off + offsetof(struct sctphdr, checksum))) {
 303                         return;
 304                 }
 305
 306                 /* Copy out the port numbers and the verification tag. */
 307                 memset(&sh, 0, sizeof(sh));
 308                 m_copydata(ip6cp->ip6c_m,
 309                     ip6cp->ip6c_off,
 310                     sizeof(uint16_t) + sizeof(uint16_t) + sizeof(uint32_t),
 311                     (caddr_t)&sh);
 312                 memset(&src, 0, sizeof(struct sockaddr_in6));
 313                 src.sin6_family = AF_INET6;
 314                 src.sin6_len = sizeof(struct sockaddr_in6);
 315                 src.sin6_port = sh.src_port;
 316                 src.sin6_addr = ip6cp->ip6c_ip6->ip6_src;
 317                 if (in6_setscope(&src.sin6_addr, ip6cp->ip6c_m->m_pkthdr.rcvif, NULL) != 0) {
 318                         return;
 319                 }
 320                 memset(&dst, 0, sizeof(struct sockaddr_in6));
 321                 dst.sin6_family = AF_INET6;
 322                 dst.sin6_len = sizeof(struct sockaddr_in6);
 323                 dst.sin6_port = sh.dest_port;
 324                 dst.sin6_addr = ip6cp->ip6c_ip6->ip6_dst;
 325                 if (in6_setscope(&dst.sin6_addr, ip6cp->ip6c_m->m_pkthdr.rcvif, NULL) != 0) {
 326                         return;
 327                 }
 328                 inp = NULL;
 329                 net = NULL;
 330                 stcb = sctp_findassociation_addr_sa((struct sockaddr *)&dst,
 331                     (struct sockaddr *)&src,
 332                     &inp, &net, 1, SCTP_DEFAULT_VRFID);
 333                 if ((stcb != NULL) &&
 334                     (net != NULL) &&
 335                     (inp != NULL)) {
 336                         /* Check the verification tag */
 337                         if (ntohl(sh.v_tag) != 0) {
 338                                 /*
 339                                  * This must be the verification tag used
 340                                  * for sending out packets. We don't
 341                                  * consider packets reflecting the
 342                                  * verification tag.
 343                                  */
 344                                 if (ntohl(sh.v_tag) != stcb->asoc.peer_vtag) {
 345                                         SCTP_TCB_UNLOCK(stcb);
 346                                         return;
 347                                 }
 348                         } else {
 349                                 if (ip6cp->ip6c_m->m_pkthdr.len >=
 350                                     ip6cp->ip6c_off + sizeof(struct sctphdr) +
 351                                     sizeof(struct sctp_chunkhdr) +
 352                                     offsetof(struct sctp_init, a_rwnd)) {
 353                                         /*
 354                                          * In this case we can check if we
 355                                          * got an INIT chunk and if the
 356                                          * initiate tag matches.
 357                                          */
 358                                         uint32_t initiate_tag;
 359                                         uint8_t chunk_type;
 360
 361                                         m_copydata(ip6cp->ip6c_m,
 362                                             ip6cp->ip6c_off +
 363                                             sizeof(struct sctphdr),
 364                                             sizeof(uint8_t),
 365                                             (caddr_t)&chunk_type);
 366                                         m_copydata(ip6cp->ip6c_m,
 367                                             ip6cp->ip6c_off +
 368                                             sizeof(struct sctphdr) +
 369                                             sizeof(struct sctp_chunkhdr),
 370                                             sizeof(uint32_t),
 371                                             (caddr_t)&initiate_tag);
 372                                         if ((chunk_type != SCTP_INITIATION) ||
 373                                             (ntohl(initiate_tag) != stcb->asoc.my_vtag)) {
 374                                                 SCTP_TCB_UNLOCK(stcb);
 375                                                 return;
 376                                         }
 377                                 } else {
 378                                         SCTP_TCB_UNLOCK(stcb);
 379                                         return;
 380                                 }
 381                         }
 382                         sctp6_notify(inp, stcb, net,
 383                             ip6cp->ip6c_icmp6->icmp6_type,
 384                             ip6cp->ip6c_icmp6->icmp6_code,
 385                             ntohl(ip6cp->ip6c_icmp6->icmp6_mtu));
 386                 } else {
 387                         if ((stcb == NULL) && (inp != NULL)) {
 388                                 /* reduce inp's ref-count */
 389                                 SCTP_INP_WLOCK(inp);
 390                                 SCTP_INP_DECR_REF(inp);
 391                                 SCTP_INP_WUNLOCK(inp);
 392                         }
 393                         if (stcb) {
 394                                 SCTP_TCB_UNLOCK(stcb);
 395                         }
 396                 }
 397         }
 398 }
 399
 400 /*
 401  * this routine can probably be collasped into the one in sctp_userreq.c
 402  * since they do the same thing and now we lookup with a sockaddr
 403  */
 404 static int
 405 sctp6_getcred(SYSCTL_HANDLER_ARGS)
 406 {
 407         struct xucred xuc;
 408         struct sockaddr_in6 addrs[2];
 409         struct sctp_inpcb *inp;
 410         struct sctp_nets *net;
 411         struct sctp_tcb *stcb;
 412         int error;
 413         uint32_t vrf_id;
 414
 415         vrf_id = SCTP_DEFAULT_VRFID;
 416
 417         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 418         if (error)
 419                 return (error);
 420
 421         if (req->newlen != sizeof(addrs)) {
 422                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 423                 return (EINVAL);
 424         }
 425         if (req->oldlen != sizeof(struct ucred)) {
 426                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 427                 return (EINVAL);
 428         }
 429         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 430         if (error)
 431                 return (error);
 432
 433         stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[1]),
 434             sin6tosa(&addrs[0]),
 435             &inp, &net, 1, vrf_id);
 436         if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) {
 437                 if ((inp != NULL) && (stcb == NULL)) {
 438                         /* reduce ref-count */
 439                         SCTP_INP_WLOCK(inp);
 440                         SCTP_INP_DECR_REF(inp);
 441                         goto cred_can_cont;
 442                 }
 443                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 444                 error = ENOENT;
 445                 goto out;
 446         }
 447         SCTP_TCB_UNLOCK(stcb);
 448         /*
 449          * We use the write lock here, only since in the error leg we need
 450          * it. If we used RLOCK, then we would have to
 451          * wlock/decr/unlock/rlock. Which in theory could create a hole.
 452          * Better to use higher wlock.
 453          */
 454         SCTP_INP_WLOCK(inp);
 455 cred_can_cont:
 456         error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket);
 457         if (error) {
 458                 SCTP_INP_WUNLOCK(inp);
 459                 goto out;
 460         }
 461         cru2x(inp->sctp_socket->so_cred, &xuc);
 462         SCTP_INP_WUNLOCK(inp);
 463         error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 464 out:
 465         return (error);
 466 }
 467
 468 SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW,
 469     0, 0,
 470     sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection");
 471
 472
 473 /* This is the same as the sctp_abort() could be made common */
 474 static void
 475 sctp6_abort(struct socket *so)
 476 {
 477         struct sctp_inpcb *inp;
 478         uint32_t flags;
 479
 480         inp = (struct sctp_inpcb *)so->so_pcb;
 481         if (inp == NULL) {
 482                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 483                 return;
 484         }
 485 sctp_must_try_again:
 486         flags = inp->sctp_flags;
 487 #ifdef SCTP_LOG_CLOSING
 488         sctp_log_closing(inp, NULL, 17);
 489 #endif
 490         if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) &&
 491             (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) {
 492 #ifdef SCTP_LOG_CLOSING
 493                 sctp_log_closing(inp, NULL, 16);
 494 #endif
 495                 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT,
 496                     SCTP_CALLED_AFTER_CMPSET_OFCLOSE);
 497                 SOCK_LOCK(so);
 498                 SCTP_SB_CLEAR(so->so_snd);
 499                 /*
 500                  * same for the rcv ones, they are only here for the
 501                  * accounting/select.
 502                  */
 503                 SCTP_SB_CLEAR(so->so_rcv);
 504                 /* Now null out the reference, we are completely detached. */
 505                 so->so_pcb = NULL;
 506                 SOCK_UNLOCK(so);
 507         } else {
 508                 flags = inp->sctp_flags;
 509                 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) {
 510                         goto sctp_must_try_again;
 511                 }
 512         }
 513         return;
 514 }
 515
 516 static int
 517 sctp6_attach(struct socket *so, int proto SCTP_UNUSED, struct thread *p SCTP_UNUSED)
 518 {
 519         struct in6pcb *inp6;
 520         int error;
 521         struct sctp_inpcb *inp;
 522         uint32_t vrf_id = SCTP_DEFAULT_VRFID;
 523
 524         inp = (struct sctp_inpcb *)so->so_pcb;
 525         if (inp != NULL) {
 526                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 527                 return (EINVAL);
 528         }
 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
 572         if (addr) {
 573                 switch (addr->sa_family) {
 574 #ifdef INET
 575                 case AF_INET:
 576                         if (addr->sa_len != sizeof(struct sockaddr_in)) {
 577                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 578                                 return (EINVAL);
 579                         }
 580                         break;
 581 #endif
 582 #ifdef INET6
 583                 case AF_INET6:
 584                         if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 585                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 586                                 return (EINVAL);
 587                         }
 588                         break;
 589 #endif
 590                 default:
 591                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 592                         return (EINVAL);
 593                 }
 594         }
 595         inp6 = (struct in6pcb *)inp;
 596         vflagsav = inp6->inp_vflag;
 597         inp6->inp_vflag &= ~INP_IPV4;
 598         inp6->inp_vflag |= INP_IPV6;
 599         if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp6) == 0)) {
 600                 switch (addr->sa_family) {
 601 #ifdef INET
 602                 case AF_INET:
 603                         /* binding v4 addr to v6 socket, so reset flags */
 604                         inp6->inp_vflag |= INP_IPV4;
 605                         inp6->inp_vflag &= ~INP_IPV6;
 606                         break;
 607 #endif
 608 #ifdef INET6
 609                 case AF_INET6:
 610                         {
 611                                 struct sockaddr_in6 *sin6_p;
 612
 613                                 sin6_p = (struct sockaddr_in6 *)addr;
 614
 615                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
 616                                         inp6->inp_vflag |= INP_IPV4;
 617                                 }
 618 #ifdef INET
 619                                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 620                                         struct sockaddr_in sin;
 621
 622                                         in6_sin6_2_sin(&sin, sin6_p);
 623                                         inp6->inp_vflag |= INP_IPV4;
 624                                         inp6->inp_vflag &= ~INP_IPV6;
 625                                         error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p);
 626                                         goto out;
 627                                 }
 628 #endif
 629                                 break;
 630                         }
 631 #endif
 632                 default:
 633                         break;
 634                 }
 635         } else if (addr != NULL) {
 636                 struct sockaddr_in6 *sin6_p;
 637
 638                 /* IPV6_V6ONLY socket */
 639 #ifdef INET
 640                 if (addr->sa_family == AF_INET) {
 641                         /* can't bind v4 addr to v6 only socket! */
 642                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 643                         error = EINVAL;
 644                         goto out;
 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                         error = EINVAL;
 654                         goto out;
 655                 }
 656         }
 657         error = sctp_inpcb_bind(so, addr, NULL, p);
 658 out:
 659         if (error != 0)
 660                 inp6->inp_vflag = vflagsav;
 661         return (error);
 662 }
 663
 664
 665 static void
 666 sctp6_close(struct socket *so)
 667 {
 668         sctp_close(so);
 669 }
 670
 671 /* This could be made common with sctp_detach() since they are identical */
 672
 673 static
 674 int
 675 sctp6_disconnect(struct socket *so)
 676 {
 677         return (sctp_disconnect(so));
 678 }
 679
 680
 681 int
 682 sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 683     struct mbuf *control, struct thread *p);
 684
 685
 686 static int
 687 sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 688     struct mbuf *control, struct thread *p)
 689 {
 690         struct sctp_inpcb *inp;
 691         struct in6pcb *inp6;
 692
 693 #ifdef INET
 694         struct sockaddr_in6 *sin6;
 695 #endif                          /* INET */
 696         /* No SPL needed since sctp_output does this */
 697
 698         inp = (struct sctp_inpcb *)so->so_pcb;
 699         if (inp == NULL) {
 700                 if (control) {
 701                         SCTP_RELEASE_PKT(control);
 702                         control = NULL;
 703                 }
 704                 SCTP_RELEASE_PKT(m);
 705                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 706                 return (EINVAL);
 707         }
 708         inp6 = (struct in6pcb *)inp;
 709         /*
 710          * For the TCP model we may get a NULL addr, if we are a connected
 711          * socket thats ok.
 712          */
 713         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) &&
 714             (addr == NULL)) {
 715                 goto connected_type;
 716         }
 717         if (addr == NULL) {
 718                 SCTP_RELEASE_PKT(m);
 719                 if (control) {
 720                         SCTP_RELEASE_PKT(control);
 721                         control = NULL;
 722                 }
 723                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ);
 724                 return (EDESTADDRREQ);
 725         }
 726 #ifdef INET
 727         sin6 = (struct sockaddr_in6 *)addr;
 728         if (SCTP_IPV6_V6ONLY(inp6)) {
 729                 /*
 730                  * if IPV6_V6ONLY flag, we discard datagrams destined to a
 731                  * v4 addr or v4-mapped addr
 732                  */
 733                 if (addr->sa_family == AF_INET) {
 734                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 735                         return (EINVAL);
 736                 }
 737                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 738                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 739                         return (EINVAL);
 740                 }
 741         }
 742         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 743                 struct sockaddr_in sin;
 744
 745                 /* convert v4-mapped into v4 addr and send */
 746                 in6_sin6_2_sin(&sin, sin6);
 747                 return (sctp_sendm(so, flags, m, (struct sockaddr *)&sin, control, p));
 748         }
 749 #endif                          /* INET */
 750 connected_type:
 751         /* now what about control */
 752         if (control) {
 753                 if (inp->control) {
 754                         SCTP_PRINTF("huh? control set?\n");
 755                         SCTP_RELEASE_PKT(inp->control);
 756                         inp->control = NULL;
 757                 }
 758                 inp->control = control;
 759         }
 760         /* Place the data */
 761         if (inp->pkt) {
 762                 SCTP_BUF_NEXT(inp->pkt_last) = m;
 763                 inp->pkt_last = m;
 764         } else {
 765                 inp->pkt_last = inp->pkt = m;
 766         }
 767         if (
 768         /* FreeBSD and MacOSX uses a flag passed */
 769             ((flags & PRUS_MORETOCOME) == 0)
 770             ) {
 771                 /*
 772                  * note with the current version this code will only be used
 773                  * by OpenBSD, NetBSD and FreeBSD have methods for
 774                  * re-defining sosend() to use sctp_sosend().  One can
 775                  * optionaly switch back to this code (by changing back the
 776                  * defininitions but this is not advisable.
 777                  */
 778                 int ret;
 779
 780                 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
 781                 inp->pkt = NULL;
 782                 inp->control = NULL;
 783                 return (ret);
 784         } else {
 785                 return (0);
 786         }
 787 }
 788
 789 static int
 790 sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
 791 {
 792         uint32_t vrf_id;
 793         int error = 0;
 794         struct sctp_inpcb *inp;
 795         struct sctp_tcb *stcb;
 796 #ifdef INET
 797         struct in6pcb *inp6;
 798         struct sockaddr_in6 *sin6;
 799         union sctp_sockstore store;
 800 #endif
 801
 802 #ifdef INET
 803         inp6 = (struct in6pcb *)so->so_pcb;
 804 #endif
 805         inp = (struct sctp_inpcb *)so->so_pcb;
 806         if (inp == NULL) {
 807                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 808                 return (ECONNRESET);    /* I made the same as TCP since we are
 809                                          * not setup? */
 810         }
 811         if (addr == NULL) {
 812                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 813                 return (EINVAL);
 814         }
 815         switch (addr->sa_family) {
 816 #ifdef INET
 817         case AF_INET:
 818                 if (addr->sa_len != sizeof(struct sockaddr_in)) {
 819                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 820                         return (EINVAL);
 821                 }
 822                 break;
 823 #endif
 824 #ifdef INET6
 825         case AF_INET6:
 826                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 827                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 828                         return (EINVAL);
 829                 }
 830                 break;
 831 #endif
 832         default:
 833                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 834                 return (EINVAL);
 835         }
 836
 837         vrf_id = inp->def_vrf_id;
 838         SCTP_ASOC_CREATE_LOCK(inp);
 839         SCTP_INP_RLOCK(inp);
 840         if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) ==
 841             SCTP_PCB_FLAGS_UNBOUND) {
 842                 /* Bind a ephemeral port */
 843                 SCTP_INP_RUNLOCK(inp);
 844                 error = sctp6_bind(so, NULL, p);
 845                 if (error) {
 846                         SCTP_ASOC_CREATE_UNLOCK(inp);
 847
 848                         return (error);
 849                 }
 850                 SCTP_INP_RLOCK(inp);
 851         }
 852         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
 853             (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) {
 854                 /* We are already connected AND the TCP model */
 855                 SCTP_INP_RUNLOCK(inp);
 856                 SCTP_ASOC_CREATE_UNLOCK(inp);
 857                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE);
 858                 return (EADDRINUSE);
 859         }
 860 #ifdef INET
 861         sin6 = (struct sockaddr_in6 *)addr;
 862         if (SCTP_IPV6_V6ONLY(inp6)) {
 863                 /*
 864                  * if IPV6_V6ONLY flag, ignore connections destined to a v4
 865                  * addr or v4-mapped addr
 866                  */
 867                 if (addr->sa_family == AF_INET) {
 868                         SCTP_INP_RUNLOCK(inp);
 869                         SCTP_ASOC_CREATE_UNLOCK(inp);
 870                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 871                         return (EINVAL);
 872                 }
 873                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 874                         SCTP_INP_RUNLOCK(inp);
 875                         SCTP_ASOC_CREATE_UNLOCK(inp);
 876                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 877                         return (EINVAL);
 878                 }
 879         }
 880         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 881                 /* convert v4-mapped into v4 addr */
 882                 in6_sin6_2_sin(&store.sin, sin6);
 883                 addr = &store.sa;
 884         }
 885 #endif                          /* INET */
 886         /* Now do we connect? */
 887         if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
 888                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
 889                 if (stcb) {
 890                         SCTP_TCB_LOCK(stcb);
 891                 }
 892                 SCTP_INP_RUNLOCK(inp);
 893         } else {
 894                 SCTP_INP_RUNLOCK(inp);
 895                 SCTP_INP_WLOCK(inp);
 896                 SCTP_INP_INCR_REF(inp);
 897                 SCTP_INP_WUNLOCK(inp);
 898                 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL);
 899                 if (stcb == NULL) {
 900                         SCTP_INP_WLOCK(inp);
 901                         SCTP_INP_DECR_REF(inp);
 902                         SCTP_INP_WUNLOCK(inp);
 903                 }
 904         }
 905
 906         if (stcb != NULL) {
 907                 /* Already have or am bring up an association */
 908                 SCTP_ASOC_CREATE_UNLOCK(inp);
 909                 SCTP_TCB_UNLOCK(stcb);
 910                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY);
 911                 return (EALREADY);
 912         }
 913         /* We are GOOD to go */
 914         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
 915             inp->sctp_ep.pre_open_stream_count,
 916             inp->sctp_ep.port, p);
 917         SCTP_ASOC_CREATE_UNLOCK(inp);
 918         if (stcb == NULL) {
 919                 /* Gak! no memory */
 920                 return (error);
 921         }
 922         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
 923                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
 924                 /* Set the connected flag so we can queue data */
 925                 soisconnecting(so);
 926         }
 927         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
 928         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
 929
 930         /* initialize authentication parameters for the assoc */
 931         sctp_initialize_auth_params(inp, stcb);
 932
 933         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
 934         SCTP_TCB_UNLOCK(stcb);
 935         return (error);
 936 }
 937
 938 static int
 939 sctp6_getaddr(struct socket *so, struct sockaddr **addr)
 940 {
 941         struct sockaddr_in6 *sin6;
 942         struct sctp_inpcb *inp;
 943         uint32_t vrf_id;
 944         struct sctp_ifa *sctp_ifa;
 945
 946         int error;
 947
 948         /*
 949          * Do the malloc first in case it blocks.
 950          */
 951         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof(*sin6));
 952         if (sin6 == NULL)
 953                 return (ENOMEM);
 954         sin6->sin6_family = AF_INET6;
 955         sin6->sin6_len = sizeof(*sin6);
 956
 957         inp = (struct sctp_inpcb *)so->so_pcb;
 958         if (inp == NULL) {
 959                 SCTP_FREE_SONAME(sin6);
 960                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 961                 return (ECONNRESET);
 962         }
 963         SCTP_INP_RLOCK(inp);
 964         sin6->sin6_port = inp->sctp_lport;
 965         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
 966                 /* For the bound all case you get back 0 */
 967                 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
 968                         struct sctp_tcb *stcb;
 969                         struct sockaddr_in6 *sin_a6;
 970                         struct sctp_nets *net;
 971                         int fnd;
 972
 973                         stcb = LIST_FIRST(&inp->sctp_asoc_list);
 974                         if (stcb == NULL) {
 975                                 SCTP_INP_RUNLOCK(inp);
 976                                 SCTP_FREE_SONAME(sin6);
 977                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 978                                 return (ENOENT);
 979                         }
 980                         fnd = 0;
 981                         sin_a6 = NULL;
 982                         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 983                                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 984                                 if (sin_a6 == NULL)
 985                                         /* this will make coverity happy */
 986                                         continue;
 987
 988                                 if (sin_a6->sin6_family == AF_INET6) {
 989                                         fnd = 1;
 990                                         break;
 991                                 }
 992                         }
 993                         if ((!fnd) || (sin_a6 == NULL)) {
 994                                 /* punt */
 995                                 SCTP_INP_RUNLOCK(inp);
 996                                 SCTP_FREE_SONAME(sin6);
 997                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 998                                 return (ENOENT);
 999                         }
1000                         vrf_id = inp->def_vrf_id;
1001                         sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *)&net->ro, net, 0, vrf_id);
1002                         if (sctp_ifa) {
1003                                 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr;
1004                         }
1005                 } else {
1006                         /* For the bound all case you get back 0 */
1007                         memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr));
1008                 }
1009         } else {
1010                 /* Take the first IPv6 address in the list */
1011                 struct sctp_laddr *laddr;
1012                 int fnd = 0;
1013
1014                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
1015                         if (laddr->ifa->address.sa.sa_family == AF_INET6) {
1016                                 struct sockaddr_in6 *sin_a;
1017
1018                                 sin_a = &laddr->ifa->address.sin6;
1019                                 sin6->sin6_addr = sin_a->sin6_addr;
1020                                 fnd = 1;
1021                                 break;
1022                         }
1023                 }
1024                 if (!fnd) {
1025                         SCTP_FREE_SONAME(sin6);
1026                         SCTP_INP_RUNLOCK(inp);
1027                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1028                         return (ENOENT);
1029                 }
1030         }
1031         SCTP_INP_RUNLOCK(inp);
1032         /* Scoping things for v6 */
1033         if ((error = sa6_recoverscope(sin6)) != 0) {
1034                 SCTP_FREE_SONAME(sin6);
1035                 return (error);
1036         }
1037         (*addr) = (struct sockaddr *)sin6;
1038         return (0);
1039 }
1040
1041 static int
1042 sctp6_peeraddr(struct socket *so, struct sockaddr **addr)
1043 {
1044         struct sockaddr_in6 *sin6;
1045         int fnd;
1046         struct sockaddr_in6 *sin_a6;
1047         struct sctp_inpcb *inp;
1048         struct sctp_tcb *stcb;
1049         struct sctp_nets *net;
1050         int error;
1051
1052         /* Do the malloc first in case it blocks. */
1053         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1054         if (sin6 == NULL)
1055                 return (ENOMEM);
1056         sin6->sin6_family = AF_INET6;
1057         sin6->sin6_len = sizeof(*sin6);
1058
1059         inp = (struct sctp_inpcb *)so->so_pcb;
1060         if ((inp == NULL) ||
1061             ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
1062                 /* UDP type and listeners will drop out here */
1063                 SCTP_FREE_SONAME(sin6);
1064                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN);
1065                 return (ENOTCONN);
1066         }
1067         SCTP_INP_RLOCK(inp);
1068         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1069         if (stcb) {
1070                 SCTP_TCB_LOCK(stcb);
1071         }
1072         SCTP_INP_RUNLOCK(inp);
1073         if (stcb == NULL) {
1074                 SCTP_FREE_SONAME(sin6);
1075                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1076                 return (ECONNRESET);
1077         }
1078         fnd = 0;
1079         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1080                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1081                 if (sin_a6->sin6_family == AF_INET6) {
1082                         fnd = 1;
1083                         sin6->sin6_port = stcb->rport;
1084                         sin6->sin6_addr = sin_a6->sin6_addr;
1085                         break;
1086                 }
1087         }
1088         SCTP_TCB_UNLOCK(stcb);
1089         if (!fnd) {
1090                 /* No IPv4 address */
1091                 SCTP_FREE_SONAME(sin6);
1092                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1093                 return (ENOENT);
1094         }
1095         if ((error = sa6_recoverscope(sin6)) != 0) {
1096                 SCTP_FREE_SONAME(sin6);
1097                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, error);
1098                 return (error);
1099         }
1100         *addr = (struct sockaddr *)sin6;
1101         return (0);
1102 }
1103
1104 static int
1105 sctp6_in6getaddr(struct socket *so, struct sockaddr **nam)
1106 {
1107         struct in6pcb *inp6 = sotoin6pcb(so);
1108         int error;
1109
1110         if (inp6 == NULL) {
1111                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1112                 return (EINVAL);
1113         }
1114
1115         /* allow v6 addresses precedence */
1116         error = sctp6_getaddr(so, nam);
1117 #ifdef INET
1118         if (error) {
1119                 struct sockaddr_in6 *sin6;
1120
1121                 /* try v4 next if v6 failed */
1122                 error = sctp_ingetaddr(so, nam);
1123                 if (error) {
1124                         return (error);
1125                 }
1126                 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1127                 if (sin6 == NULL) {
1128                         SCTP_FREE_SONAME(*nam);
1129                         return (ENOMEM);
1130                 }
1131                 in6_sin_2_v4mapsin6((struct sockaddr_in *)*nam, sin6);
1132                 SCTP_FREE_SONAME(*nam);
1133                 *nam = (struct sockaddr *)sin6;
1134         }
1135 #endif
1136         return (error);
1137 }
1138
1139
1140 static int
1141 sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
1142 {
1143         struct in6pcb *inp6 = sotoin6pcb(so);
1144         int error;
1145
1146         if (inp6 == NULL) {
1147                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1148                 return (EINVAL);
1149         }
1150
1151         /* allow v6 addresses precedence */
1152         error = sctp6_peeraddr(so, nam);
1153 #ifdef INET
1154         if (error) {
1155                 struct sockaddr_in6 *sin6;
1156
1157                 /* try v4 next if v6 failed */
1158                 error = sctp_peeraddr(so, nam);
1159                 if (error) {
1160                         return (error);
1161                 }
1162                 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1163                 if (sin6 == NULL) {
1164                         SCTP_FREE_SONAME(*nam);
1165                         return (ENOMEM);
1166                 }
1167                 in6_sin_2_v4mapsin6((struct sockaddr_in *)*nam, sin6);
1168                 SCTP_FREE_SONAME(*nam);
1169                 *nam = (struct sockaddr *)sin6;
1170         }
1171 #endif
1172         return (error);
1173 }
1174
1175 struct pr_usrreqs sctp6_usrreqs = {
1176         .pru_abort = sctp6_abort,
1177         .pru_accept = sctp_accept,
1178         .pru_attach = sctp6_attach,
1179         .pru_bind = sctp6_bind,
1180         .pru_connect = sctp6_connect,
1181         .pru_control = in6_control,
1182         .pru_close = sctp6_close,
1183         .pru_detach = sctp6_close,
1184         .pru_sopoll = sopoll_generic,
1185         .pru_flush = sctp_flush,
1186         .pru_disconnect = sctp6_disconnect,
1187         .pru_listen = sctp_listen,
1188         .pru_peeraddr = sctp6_getpeeraddr,
1189         .pru_send = sctp6_send,
1190         .pru_shutdown = sctp_shutdown,
1191         .pru_sockaddr = sctp6_in6getaddr,
1192         .pru_sosend = sctp_sosend,
1193         .pru_soreceive = sctp_soreceive
1194 };
1195
1196 #endif