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 #ifdef IPSEC
  59 #include <netipsec/ipsec.h>
  60 #include <netipsec/ipsec6.h>
  61 #endif                          /* IPSEC */
  62
  63 extern struct protosw inetsw[];
  64
  65 int
  66 sctp6_input_with_port(struct mbuf **i_pak, int *offp, uint16_t port)
  67 {
  68         struct mbuf *m;
  69         int iphlen;
  70         uint32_t vrf_id;
  71         uint8_t ecn_bits;
  72         struct sockaddr_in6 src, dst;
  73         struct ip6_hdr *ip6;
  74         struct sctphdr *sh;
  75         struct sctp_chunkhdr *ch;
  76         int length, offset;
  77
  78 #if !defined(SCTP_WITH_NO_CSUM)
  79         uint8_t compute_crc;
  80
  81 #endif
  82         uint32_t mflowid;
  83         uint8_t mflowtype;
  84         uint16_t fibnum;
  85
  86         iphlen = *offp;
  87         if (SCTP_GET_PKT_VRFID(*i_pak, vrf_id)) {
  88                 SCTP_RELEASE_PKT(*i_pak);
  89                 return (IPPROTO_DONE);
  90         }
  91         m = SCTP_HEADER_TO_CHAIN(*i_pak);
  92 #ifdef SCTP_MBUF_LOGGING
  93         /* Log in any input mbufs */
  94         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
  95                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
  96         }
  97 #endif
  98 #ifdef SCTP_PACKET_LOGGING
  99         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
 100                 sctp_packet_log(m);
 101         }
 102 #endif
 103         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
 104             "sctp6_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
 105             m->m_pkthdr.len,
 106             if_name(m->m_pkthdr.rcvif),
 107             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
 108         mflowid = m->m_pkthdr.flowid;
 109         mflowtype = M_HASHTYPE_GET(m);
 110         fibnum = M_GETFIB(m);
 111         SCTP_STAT_INCR(sctps_recvpackets);
 112         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
 113         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
 114         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
 115         ip6 = mtod(m, struct ip6_hdr *);
 116         IP6_EXTHDR_GET(sh, struct sctphdr *, m, iphlen,
 117             (int)(sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr)));
 118         if (sh == NULL) {
 119                 SCTP_STAT_INCR(sctps_hdrops);
 120                 return (IPPROTO_DONE);
 121         }
 122         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
 123         offset -= sizeof(struct sctp_chunkhdr);
 124         memset(&src, 0, sizeof(struct sockaddr_in6));
 125         src.sin6_family = AF_INET6;
 126         src.sin6_len = sizeof(struct sockaddr_in6);
 127         src.sin6_port = sh->src_port;
 128         src.sin6_addr = ip6->ip6_src;
 129         if (in6_setscope(&src.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
 130                 goto out;
 131         }
 132         memset(&dst, 0, sizeof(struct sockaddr_in6));
 133         dst.sin6_family = AF_INET6;
 134         dst.sin6_len = sizeof(struct sockaddr_in6);
 135         dst.sin6_port = sh->dest_port;
 136         dst.sin6_addr = ip6->ip6_dst;
 137         if (in6_setscope(&dst.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
 138                 goto out;
 139         }
 140         length = ntohs(ip6->ip6_plen) + iphlen;
 141         /* Validate mbuf chain length with IP payload length. */
 142         if (SCTP_HEADER_LEN(m) != length) {
 143                 SCTPDBG(SCTP_DEBUG_INPUT1,
 144                     "sctp6_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
 145                 SCTP_STAT_INCR(sctps_hdrops);
 146                 goto out;
 147         }
 148         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 149                 goto out;
 150         }
 151         ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff);
 152 #if defined(SCTP_WITH_NO_CSUM)
 153         SCTP_STAT_INCR(sctps_recvnocrc);
 154 #else
 155         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
 156                 SCTP_STAT_INCR(sctps_recvhwcrc);
 157                 compute_crc = 0;
 158         } else {
 159                 SCTP_STAT_INCR(sctps_recvswcrc);
 160                 compute_crc = 1;
 161         }
 162 #endif
 163         sctp_common_input_processing(&m, iphlen, offset, length,
 164             (struct sockaddr *)&src,
 165             (struct sockaddr *)&dst,
 166             sh, ch,
 167 #if !defined(SCTP_WITH_NO_CSUM)
 168             compute_crc,
 169 #endif
 170             ecn_bits,
 171             mflowtype, mflowid, fibnum,
 172             vrf_id, port);
 173 out:
 174         if (m) {
 175                 sctp_m_freem(m);
 176         }
 177         return (IPPROTO_DONE);
 178 }
 179
 180
 181 int
 182 sctp6_input(struct mbuf **i_pak, int *offp, int proto SCTP_UNUSED)
 183 {
 184         return (sctp6_input_with_port(i_pak, offp, 0));
 185 }
 186
 187 void
 188 sctp6_notify(struct sctp_inpcb *inp,
 189     struct sctp_tcb *stcb,
 190     struct sctp_nets *net,
 191     uint8_t icmp6_type,
 192     uint8_t icmp6_code,
 193     uint16_t next_mtu)
 194 {
 195 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 196         struct socket *so;
 197
 198 #endif
 199         int timer_stopped;
 200
 201         switch (icmp6_type) {
 202         case ICMP6_DST_UNREACH:
 203                 if ((icmp6_code == ICMP6_DST_UNREACH_NOROUTE) ||
 204                     (icmp6_code == ICMP6_DST_UNREACH_ADMIN) ||
 205                     (icmp6_code == ICMP6_DST_UNREACH_BEYONDSCOPE) ||
 206                     (icmp6_code == ICMP6_DST_UNREACH_ADDR)) {
 207                         /* Mark the net unreachable. */
 208                         if (net->dest_state & SCTP_ADDR_REACHABLE) {
 209                                 /* Ok that destination is not reachable */
 210                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
 211                                 net->dest_state &= ~SCTP_ADDR_PF;
 212                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
 213                                     stcb, 0, (void *)net, SCTP_SO_NOT_LOCKED);
 214                         }
 215                 }
 216                 SCTP_TCB_UNLOCK(stcb);
 217                 break;
 218         case ICMP6_PARAM_PROB:
 219                 /* Treat it like an ABORT. */
 220                 if (icmp6_code == ICMP6_PARAMPROB_NEXTHEADER) {
 221                         sctp_abort_notification(stcb, 1, 0, NULL, SCTP_SO_NOT_LOCKED);
 222 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 223                         so = SCTP_INP_SO(inp);
 224                         atomic_add_int(&stcb->asoc.refcnt, 1);
 225                         SCTP_TCB_UNLOCK(stcb);
 226                         SCTP_SOCKET_LOCK(so, 1);
 227                         SCTP_TCB_LOCK(stcb);
 228                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 229 #endif
 230                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
 231                             SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2);
 232 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 233                         SCTP_SOCKET_UNLOCK(so, 1);
 234 #endif
 235                 } else {
 236                         SCTP_TCB_UNLOCK(stcb);
 237                 }
 238                 break;
 239         case ICMP6_PACKET_TOO_BIG:
 240                 if (SCTP_OS_TIMER_PENDING(&net->pmtu_timer.timer)) {
 241                         timer_stopped = 1;
 242                         sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net,
 243                             SCTP_FROM_SCTP_USRREQ + SCTP_LOC_1);
 244                 } else {
 245                         timer_stopped = 0;
 246                 }
 247                 break;
 248                 /* Update the path MTU. */
 249                 if (net->mtu > next_mtu) {
 250                         net->mtu = next_mtu;
 251                         if (net->port) {
 252                                 net->mtu -= sizeof(struct udphdr);
 253                         }
 254                 }
 255                 /* Update the association MTU */
 256                 if (stcb->asoc.smallest_mtu > next_mtu) {
 257                         sctp_pathmtu_adjustment(stcb, next_mtu);
 258                 }
 259                 /* Finally, start the PMTU timer if it was running before. */
 260                 if (timer_stopped) {
 261                         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
 262                 }
 263                 SCTP_TCB_UNLOCK(stcb);
 264                 break;
 265         default:
 266                 SCTP_TCB_UNLOCK(stcb);
 267                 break;
 268         }
 269 }
 270
 271 void
 272 sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d)
 273 {
 274         struct ip6ctlparam *ip6cp;
 275         struct sctp_inpcb *inp;
 276         struct sctp_tcb *stcb;
 277         struct sctp_nets *net;
 278         struct sctphdr sh;
 279         struct sockaddr_in6 src, dst;
 280
 281         if (pktdst->sa_family != AF_INET6 ||
 282             pktdst->sa_len != sizeof(struct sockaddr_in6)) {
 283                 return;
 284         }
 285         if ((unsigned)cmd >= PRC_NCMDS) {
 286                 return;
 287         }
 288         if (PRC_IS_REDIRECT(cmd)) {
 289                 d = NULL;
 290         } else if (inet6ctlerrmap[cmd] == 0) {
 291                 return;
 292         }
 293         /* If the parameter is from icmp6, decode it. */
 294         if (d != NULL) {
 295                 ip6cp = (struct ip6ctlparam *)d;
 296         } else {
 297                 ip6cp = (struct ip6ctlparam *)NULL;
 298         }
 299
 300         if (ip6cp != NULL) {
 301                 /*
 302                  * XXX: We assume that when IPV6 is non NULL, M and OFF are
 303                  * valid.
 304                  */
 305                 if (ip6cp->ip6c_m == NULL) {
 306                         return;
 307                 }
 308                 /*
 309                  * Check if we can safely examine the ports and the
 310                  * verification tag of the SCTP common header.
 311                  */
 312                 if (ip6cp->ip6c_m->m_pkthdr.len <
 313                     ip6cp->ip6c_off + offsetof(struct sctphdr, checksum)) {
 314                         return;
 315                 }
 316                 /* Copy out the port numbers and the verification tag. */
 317                 bzero(&sh, sizeof(sh));
 318                 m_copydata(ip6cp->ip6c_m,
 319                     ip6cp->ip6c_off,
 320                     sizeof(uint16_t) + sizeof(uint16_t) + sizeof(uint32_t),
 321                     (caddr_t)&sh);
 322                 memset(&src, 0, sizeof(struct sockaddr_in6));
 323                 src.sin6_family = AF_INET6;
 324                 src.sin6_len = sizeof(struct sockaddr_in6);
 325                 src.sin6_port = sh.src_port;
 326                 src.sin6_addr = ip6cp->ip6c_ip6->ip6_src;
 327                 if (in6_setscope(&src.sin6_addr, ip6cp->ip6c_m->m_pkthdr.rcvif, NULL) != 0) {
 328                         return;
 329                 }
 330                 memset(&dst, 0, sizeof(struct sockaddr_in6));
 331                 dst.sin6_family = AF_INET6;
 332                 dst.sin6_len = sizeof(struct sockaddr_in6);
 333                 dst.sin6_port = sh.dest_port;
 334                 dst.sin6_addr = ip6cp->ip6c_ip6->ip6_dst;
 335                 if (in6_setscope(&dst.sin6_addr, ip6cp->ip6c_m->m_pkthdr.rcvif, NULL) != 0) {
 336                         return;
 337                 }
 338                 inp = NULL;
 339                 net = NULL;
 340                 stcb = sctp_findassociation_addr_sa((struct sockaddr *)&dst,
 341                     (struct sockaddr *)&src,
 342                     &inp, &net, 1, SCTP_DEFAULT_VRFID);
 343                 if ((stcb != NULL) &&
 344                     (net != NULL) &&
 345                     (inp != NULL) &&
 346                     (inp->sctp_socket != NULL)) {
 347                         /* Check the verification tag */
 348                         if (ntohl(sh.v_tag) != 0) {
 349                                 /*
 350                                  * This must be the verification tag used
 351                                  * for sending out packets. We don't
 352                                  * consider packets reflecting the
 353                                  * verification tag.
 354                                  */
 355                                 if (ntohl(sh.v_tag) != stcb->asoc.peer_vtag) {
 356                                         SCTP_TCB_UNLOCK(stcb);
 357                                         return;
 358                                 }
 359                         } else {
 360                                 if (ip6cp->ip6c_m->m_pkthdr.len >=
 361                                     ip6cp->ip6c_off + sizeof(struct sctphdr) +
 362                                     sizeof(struct sctp_chunkhdr) +
 363                                     offsetof(struct sctp_init, a_rwnd)) {
 364                                         /*
 365                                          * In this case we can check if we
 366                                          * got an INIT chunk and if the
 367                                          * initiate tag matches.
 368                                          */
 369                                         uint32_t initiate_tag;
 370                                         uint8_t chunk_type;
 371
 372                                         m_copydata(ip6cp->ip6c_m,
 373                                             ip6cp->ip6c_off +
 374                                             sizeof(struct sctphdr),
 375                                             sizeof(uint8_t),
 376                                             (caddr_t)&chunk_type);
 377                                         m_copydata(ip6cp->ip6c_m,
 378                                             ip6cp->ip6c_off +
 379                                             sizeof(struct sctphdr) +
 380                                             sizeof(struct sctp_chunkhdr),
 381                                             sizeof(uint32_t),
 382                                             (caddr_t)&initiate_tag);
 383                                         if ((chunk_type != SCTP_INITIATION) ||
 384                                             (ntohl(initiate_tag) != stcb->asoc.my_vtag)) {
 385                                                 SCTP_TCB_UNLOCK(stcb);
 386                                                 return;
 387                                         }
 388                                 } else {
 389                                         SCTP_TCB_UNLOCK(stcb);
 390                                         return;
 391                                 }
 392                         }
 393                         sctp6_notify(inp, stcb, net,
 394                             ip6cp->ip6c_icmp6->icmp6_type,
 395                             ip6cp->ip6c_icmp6->icmp6_code,
 396                             (uint16_t) ntohl(ip6cp->ip6c_icmp6->icmp6_mtu));
 397                 } else {
 398                         if ((stcb == NULL) && (inp != NULL)) {
 399                                 /* reduce inp's ref-count */
 400                                 SCTP_INP_WLOCK(inp);
 401                                 SCTP_INP_DECR_REF(inp);
 402                                 SCTP_INP_WUNLOCK(inp);
 403                         }
 404                         if (stcb) {
 405                                 SCTP_TCB_UNLOCK(stcb);
 406                         }
 407                 }
 408         }
 409 }
 410
 411 /*
 412  * this routine can probably be collasped into the one in sctp_userreq.c
 413  * since they do the same thing and now we lookup with a sockaddr
 414  */
 415 static int
 416 sctp6_getcred(SYSCTL_HANDLER_ARGS)
 417 {
 418         struct xucred xuc;
 419         struct sockaddr_in6 addrs[2];
 420         struct sctp_inpcb *inp;
 421         struct sctp_nets *net;
 422         struct sctp_tcb *stcb;
 423         int error;
 424         uint32_t vrf_id;
 425
 426         vrf_id = SCTP_DEFAULT_VRFID;
 427
 428         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 429         if (error)
 430                 return (error);
 431
 432         if (req->newlen != sizeof(addrs)) {
 433                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 434                 return (EINVAL);
 435         }
 436         if (req->oldlen != sizeof(struct ucred)) {
 437                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 438                 return (EINVAL);
 439         }
 440         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 441         if (error)
 442                 return (error);
 443
 444         stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[1]),
 445             sin6tosa(&addrs[0]),
 446             &inp, &net, 1, vrf_id);
 447         if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) {
 448                 if ((inp != NULL) && (stcb == NULL)) {
 449                         /* reduce ref-count */
 450                         SCTP_INP_WLOCK(inp);
 451                         SCTP_INP_DECR_REF(inp);
 452                         goto cred_can_cont;
 453                 }
 454                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 455                 error = ENOENT;
 456                 goto out;
 457         }
 458         SCTP_TCB_UNLOCK(stcb);
 459         /*
 460          * We use the write lock here, only since in the error leg we need
 461          * it. If we used RLOCK, then we would have to
 462          * wlock/decr/unlock/rlock. Which in theory could create a hole.
 463          * Better to use higher wlock.
 464          */
 465         SCTP_INP_WLOCK(inp);
 466 cred_can_cont:
 467         error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket);
 468         if (error) {
 469                 SCTP_INP_WUNLOCK(inp);
 470                 goto out;
 471         }
 472         cru2x(inp->sctp_socket->so_cred, &xuc);
 473         SCTP_INP_WUNLOCK(inp);
 474         error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 475 out:
 476         return (error);
 477 }
 478
 479 SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW,
 480     0, 0,
 481     sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection");
 482
 483
 484 /* This is the same as the sctp_abort() could be made common */
 485 static void
 486 sctp6_abort(struct socket *so)
 487 {
 488         struct sctp_inpcb *inp;
 489         uint32_t flags;
 490
 491         inp = (struct sctp_inpcb *)so->so_pcb;
 492         if (inp == NULL) {
 493                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 494                 return;
 495         }
 496 sctp_must_try_again:
 497         flags = inp->sctp_flags;
 498 #ifdef SCTP_LOG_CLOSING
 499         sctp_log_closing(inp, NULL, 17);
 500 #endif
 501         if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) &&
 502             (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) {
 503 #ifdef SCTP_LOG_CLOSING
 504                 sctp_log_closing(inp, NULL, 16);
 505 #endif
 506                 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT,
 507                     SCTP_CALLED_AFTER_CMPSET_OFCLOSE);
 508                 SOCK_LOCK(so);
 509                 SCTP_SB_CLEAR(so->so_snd);
 510                 /*
 511                  * same for the rcv ones, they are only here for the
 512                  * accounting/select.
 513                  */
 514                 SCTP_SB_CLEAR(so->so_rcv);
 515                 /* Now null out the reference, we are completely detached. */
 516                 so->so_pcb = NULL;
 517                 SOCK_UNLOCK(so);
 518         } else {
 519                 flags = inp->sctp_flags;
 520                 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) {
 521                         goto sctp_must_try_again;
 522                 }
 523         }
 524         return;
 525 }
 526
 527 static int
 528 sctp6_attach(struct socket *so, int proto SCTP_UNUSED, struct thread *p SCTP_UNUSED)
 529 {
 530         struct in6pcb *inp6;
 531         int error;
 532         struct sctp_inpcb *inp;
 533         uint32_t vrf_id = SCTP_DEFAULT_VRFID;
 534
 535         inp = (struct sctp_inpcb *)so->so_pcb;
 536         if (inp != NULL) {
 537                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 538                 return (EINVAL);
 539         }
 540         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 541                 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace));
 542                 if (error)
 543                         return (error);
 544         }
 545         error = sctp_inpcb_alloc(so, vrf_id);
 546         if (error)
 547                 return (error);
 548         inp = (struct sctp_inpcb *)so->so_pcb;
 549         SCTP_INP_WLOCK(inp);
 550         inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6;     /* I'm v6! */
 551         inp6 = (struct in6pcb *)inp;
 552
 553         inp6->inp_vflag |= INP_IPV6;
 554         inp6->in6p_hops = -1;   /* use kernel default */
 555         inp6->in6p_cksum = -1;  /* just to be sure */
 556 #ifdef INET
 557         /*
 558          * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6
 559          * socket as well, because the socket may be bound to an IPv6
 560          * wildcard address, which may match an IPv4-mapped IPv6 address.
 561          */
 562         inp6->inp_ip_ttl = MODULE_GLOBAL(ip_defttl);
 563 #endif
 564         /*
 565          * Hmm what about the IPSEC stuff that is missing here but in
 566          * sctp_attach()?
 567          */
 568         SCTP_INP_WUNLOCK(inp);
 569         return (0);
 570 }
 571
 572 static int
 573 sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p)
 574 {
 575         struct sctp_inpcb *inp;
 576         struct in6pcb *inp6;
 577         int error;
 578
 579         inp = (struct sctp_inpcb *)so->so_pcb;
 580         if (inp == NULL) {
 581                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 582                 return (EINVAL);
 583         }
 584         if (addr) {
 585                 switch (addr->sa_family) {
 586 #ifdef INET
 587                 case AF_INET:
 588                         if (addr->sa_len != sizeof(struct sockaddr_in)) {
 589                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 590                                 return (EINVAL);
 591                         }
 592                         break;
 593 #endif
 594 #ifdef INET6
 595                 case AF_INET6:
 596                         if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 597                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 598                                 return (EINVAL);
 599                         }
 600                         break;
 601 #endif
 602                 default:
 603                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 604                         return (EINVAL);
 605                 }
 606         }
 607         inp6 = (struct in6pcb *)inp;
 608         inp6->inp_vflag &= ~INP_IPV4;
 609         inp6->inp_vflag |= INP_IPV6;
 610         if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp6) == 0)) {
 611                 switch (addr->sa_family) {
 612 #ifdef INET
 613                 case AF_INET:
 614                         /* binding v4 addr to v6 socket, so reset flags */
 615                         inp6->inp_vflag |= INP_IPV4;
 616                         inp6->inp_vflag &= ~INP_IPV6;
 617                         break;
 618 #endif
 619 #ifdef INET6
 620                 case AF_INET6:
 621                         {
 622                                 struct sockaddr_in6 *sin6_p;
 623
 624                                 sin6_p = (struct sockaddr_in6 *)addr;
 625
 626                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
 627                                         inp6->inp_vflag |= INP_IPV4;
 628                                 }
 629 #ifdef INET
 630                                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 631                                         struct sockaddr_in sin;
 632
 633                                         in6_sin6_2_sin(&sin, sin6_p);
 634                                         inp6->inp_vflag |= INP_IPV4;
 635                                         inp6->inp_vflag &= ~INP_IPV6;
 636                                         error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p);
 637                                         return (error);
 638                                 }
 639 #endif
 640                                 break;
 641                         }
 642 #endif
 643                 default:
 644                         break;
 645                 }
 646         } else if (addr != NULL) {
 647                 struct sockaddr_in6 *sin6_p;
 648
 649                 /* IPV6_V6ONLY socket */
 650 #ifdef INET
 651                 if (addr->sa_family == AF_INET) {
 652                         /* can't bind v4 addr to v6 only socket! */
 653                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 654                         return (EINVAL);
 655                 }
 656 #endif
 657                 sin6_p = (struct sockaddr_in6 *)addr;
 658
 659                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 660                         /* can't bind v4-mapped addrs either! */
 661                         /* NOTE: we don't support SIIT */
 662                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 663                         return (EINVAL);
 664                 }
 665         }
 666         error = sctp_inpcb_bind(so, addr, NULL, p);
 667         return (error);
 668 }
 669
 670
 671 static void
 672 sctp6_close(struct socket *so)
 673 {
 674         sctp_close(so);
 675 }
 676
 677 /* This could be made common with sctp_detach() since they are identical */
 678
 679 static
 680 int
 681 sctp6_disconnect(struct socket *so)
 682 {
 683         return (sctp_disconnect(so));
 684 }
 685
 686
 687 int
 688 sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 689     struct mbuf *control, struct thread *p);
 690
 691
 692 static int
 693 sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 694     struct mbuf *control, struct thread *p)
 695 {
 696         struct sctp_inpcb *inp;
 697         struct in6pcb *inp6;
 698
 699 #ifdef INET
 700         struct sockaddr_in6 *sin6;
 701
 702 #endif                          /* INET */
 703         /* No SPL needed since sctp_output does this */
 704
 705         inp = (struct sctp_inpcb *)so->so_pcb;
 706         if (inp == NULL) {
 707                 if (control) {
 708                         SCTP_RELEASE_PKT(control);
 709                         control = NULL;
 710                 }
 711                 SCTP_RELEASE_PKT(m);
 712                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 713                 return (EINVAL);
 714         }
 715         inp6 = (struct in6pcb *)inp;
 716         /*
 717          * For the TCP model we may get a NULL addr, if we are a connected
 718          * socket thats ok.
 719          */
 720         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) &&
 721             (addr == NULL)) {
 722                 goto connected_type;
 723         }
 724         if (addr == NULL) {
 725                 SCTP_RELEASE_PKT(m);
 726                 if (control) {
 727                         SCTP_RELEASE_PKT(control);
 728                         control = NULL;
 729                 }
 730                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ);
 731                 return (EDESTADDRREQ);
 732         }
 733 #ifdef INET
 734         sin6 = (struct sockaddr_in6 *)addr;
 735         if (SCTP_IPV6_V6ONLY(inp6)) {
 736                 /*
 737                  * if IPV6_V6ONLY flag, we discard datagrams destined to a
 738                  * v4 addr or v4-mapped addr
 739                  */
 740                 if (addr->sa_family == AF_INET) {
 741                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 742                         return (EINVAL);
 743                 }
 744                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 745                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 746                         return (EINVAL);
 747                 }
 748         }
 749         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 750                 struct sockaddr_in sin;
 751
 752                 /* convert v4-mapped into v4 addr and send */
 753                 in6_sin6_2_sin(&sin, sin6);
 754                 return (sctp_sendm(so, flags, m, (struct sockaddr *)&sin, control, p));
 755         }
 756 #endif                          /* INET */
 757 connected_type:
 758         /* now what about control */
 759         if (control) {
 760                 if (inp->control) {
 761                         SCTP_PRINTF("huh? control set?\n");
 762                         SCTP_RELEASE_PKT(inp->control);
 763                         inp->control = NULL;
 764                 }
 765                 inp->control = control;
 766         }
 767         /* Place the data */
 768         if (inp->pkt) {
 769                 SCTP_BUF_NEXT(inp->pkt_last) = m;
 770                 inp->pkt_last = m;
 771         } else {
 772                 inp->pkt_last = inp->pkt = m;
 773         }
 774         if (
 775         /* FreeBSD and MacOSX uses a flag passed */
 776             ((flags & PRUS_MORETOCOME) == 0)
 777             ) {
 778                 /*
 779                  * note with the current version this code will only be used
 780                  * by OpenBSD, NetBSD and FreeBSD have methods for
 781                  * re-defining sosend() to use sctp_sosend().  One can
 782                  * optionaly switch back to this code (by changing back the
 783                  * defininitions but this is not advisable.
 784                  */
 785                 int ret;
 786
 787                 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
 788                 inp->pkt = NULL;
 789                 inp->control = NULL;
 790                 return (ret);
 791         } else {
 792                 return (0);
 793         }
 794 }
 795
 796 static int
 797 sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
 798 {
 799         uint32_t vrf_id;
 800         int error = 0;
 801         struct sctp_inpcb *inp;
 802         struct sctp_tcb *stcb;
 803
 804 #ifdef INET
 805         struct in6pcb *inp6;
 806         struct sockaddr_in6 *sin6;
 807         union sctp_sockstore store;
 808
 809 #endif
 810
 811 #ifdef INET
 812         inp6 = (struct in6pcb *)so->so_pcb;
 813 #endif
 814         inp = (struct sctp_inpcb *)so->so_pcb;
 815         if (inp == NULL) {
 816                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 817                 return (ECONNRESET);    /* I made the same as TCP since we are
 818                                          * not setup? */
 819         }
 820         if (addr == NULL) {
 821                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 822                 return (EINVAL);
 823         }
 824         switch (addr->sa_family) {
 825 #ifdef INET
 826         case AF_INET:
 827                 if (addr->sa_len != sizeof(struct sockaddr_in)) {
 828                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 829                         return (EINVAL);
 830                 }
 831                 break;
 832 #endif
 833 #ifdef INET6
 834         case AF_INET6:
 835                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 836                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 837                         return (EINVAL);
 838                 }
 839                 break;
 840 #endif
 841         default:
 842                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 843                 return (EINVAL);
 844         }
 845
 846         vrf_id = inp->def_vrf_id;
 847         SCTP_ASOC_CREATE_LOCK(inp);
 848         SCTP_INP_RLOCK(inp);
 849         if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) ==
 850             SCTP_PCB_FLAGS_UNBOUND) {
 851                 /* Bind a ephemeral port */
 852                 SCTP_INP_RUNLOCK(inp);
 853                 error = sctp6_bind(so, NULL, p);
 854                 if (error) {
 855                         SCTP_ASOC_CREATE_UNLOCK(inp);
 856
 857                         return (error);
 858                 }
 859                 SCTP_INP_RLOCK(inp);
 860         }
 861         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
 862             (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) {
 863                 /* We are already connected AND the TCP model */
 864                 SCTP_INP_RUNLOCK(inp);
 865                 SCTP_ASOC_CREATE_UNLOCK(inp);
 866                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE);
 867                 return (EADDRINUSE);
 868         }
 869 #ifdef INET
 870         sin6 = (struct sockaddr_in6 *)addr;
 871         if (SCTP_IPV6_V6ONLY(inp6)) {
 872                 /*
 873                  * if IPV6_V6ONLY flag, ignore connections destined to a v4
 874                  * addr or v4-mapped addr
 875                  */
 876                 if (addr->sa_family == AF_INET) {
 877                         SCTP_INP_RUNLOCK(inp);
 878                         SCTP_ASOC_CREATE_UNLOCK(inp);
 879                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 880                         return (EINVAL);
 881                 }
 882                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 883                         SCTP_INP_RUNLOCK(inp);
 884                         SCTP_ASOC_CREATE_UNLOCK(inp);
 885                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 886                         return (EINVAL);
 887                 }
 888         }
 889         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 890                 /* convert v4-mapped into v4 addr */
 891                 in6_sin6_2_sin(&store.sin, sin6);
 892                 addr = &store.sa;
 893         }
 894 #endif                          /* INET */
 895         /* Now do we connect? */
 896         if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
 897                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
 898                 if (stcb) {
 899                         SCTP_TCB_UNLOCK(stcb);
 900                 }
 901                 SCTP_INP_RUNLOCK(inp);
 902         } else {
 903                 SCTP_INP_RUNLOCK(inp);
 904                 SCTP_INP_WLOCK(inp);
 905                 SCTP_INP_INCR_REF(inp);
 906                 SCTP_INP_WUNLOCK(inp);
 907                 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL);
 908                 if (stcb == NULL) {
 909                         SCTP_INP_WLOCK(inp);
 910                         SCTP_INP_DECR_REF(inp);
 911                         SCTP_INP_WUNLOCK(inp);
 912                 }
 913         }
 914
 915         if (stcb != NULL) {
 916                 /* Already have or am bring up an association */
 917                 SCTP_ASOC_CREATE_UNLOCK(inp);
 918                 SCTP_TCB_UNLOCK(stcb);
 919                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY);
 920                 return (EALREADY);
 921         }
 922         /* We are GOOD to go */
 923         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id, inp->sctp_ep.pre_open_stream_count, p);
 924         SCTP_ASOC_CREATE_UNLOCK(inp);
 925         if (stcb == NULL) {
 926                 /* Gak! no memory */
 927                 return (error);
 928         }
 929         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
 930                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
 931                 /* Set the connected flag so we can queue data */
 932                 soisconnecting(so);
 933         }
 934         stcb->asoc.state = SCTP_STATE_COOKIE_WAIT;
 935         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
 936
 937         /* initialize authentication parameters for the assoc */
 938         sctp_initialize_auth_params(inp, stcb);
 939
 940         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
 941         SCTP_TCB_UNLOCK(stcb);
 942         return (error);
 943 }
 944
 945 static int
 946 sctp6_getaddr(struct socket *so, struct sockaddr **addr)
 947 {
 948         struct sockaddr_in6 *sin6;
 949         struct sctp_inpcb *inp;
 950         uint32_t vrf_id;
 951         struct sctp_ifa *sctp_ifa;
 952
 953         int error;
 954
 955         /*
 956          * Do the malloc first in case it blocks.
 957          */
 958         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof(*sin6));
 959         if (sin6 == NULL)
 960                 return (ENOMEM);
 961         sin6->sin6_family = AF_INET6;
 962         sin6->sin6_len = sizeof(*sin6);
 963
 964         inp = (struct sctp_inpcb *)so->so_pcb;
 965         if (inp == NULL) {
 966                 SCTP_FREE_SONAME(sin6);
 967                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 968                 return (ECONNRESET);
 969         }
 970         SCTP_INP_RLOCK(inp);
 971         sin6->sin6_port = inp->sctp_lport;
 972         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
 973                 /* For the bound all case you get back 0 */
 974                 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
 975                         struct sctp_tcb *stcb;
 976                         struct sockaddr_in6 *sin_a6;
 977                         struct sctp_nets *net;
 978                         int fnd;
 979
 980                         stcb = LIST_FIRST(&inp->sctp_asoc_list);
 981                         if (stcb == NULL) {
 982                                 SCTP_INP_RUNLOCK(inp);
 983                                 SCTP_FREE_SONAME(sin6);
 984                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 985                                 return (ENOENT);
 986                         }
 987                         fnd = 0;
 988                         sin_a6 = NULL;
 989                         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 990                                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 991                                 if (sin_a6 == NULL)
 992                                         /* this will make coverity happy */
 993                                         continue;
 994
 995                                 if (sin_a6->sin6_family == AF_INET6) {
 996                                         fnd = 1;
 997                                         break;
 998                                 }
 999                         }
1000                         if ((!fnd) || (sin_a6 == NULL)) {
1001                                 /* punt */
1002                                 SCTP_INP_RUNLOCK(inp);
1003                                 SCTP_FREE_SONAME(sin6);
1004                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1005                                 return (ENOENT);
1006                         }
1007                         vrf_id = inp->def_vrf_id;
1008                         sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *) & net->ro, net, 0, vrf_id);
1009                         if (sctp_ifa) {
1010                                 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr;
1011                         }
1012                 } else {
1013                         /* For the bound all case you get back 0 */
1014                         memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr));
1015                 }
1016         } else {
1017                 /* Take the first IPv6 address in the list */
1018                 struct sctp_laddr *laddr;
1019                 int fnd = 0;
1020
1021                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
1022                         if (laddr->ifa->address.sa.sa_family == AF_INET6) {
1023                                 struct sockaddr_in6 *sin_a;
1024
1025                                 sin_a = &laddr->ifa->address.sin6;
1026                                 sin6->sin6_addr = sin_a->sin6_addr;
1027                                 fnd = 1;
1028                                 break;
1029                         }
1030                 }
1031                 if (!fnd) {
1032                         SCTP_FREE_SONAME(sin6);
1033                         SCTP_INP_RUNLOCK(inp);
1034                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1035                         return (ENOENT);
1036                 }
1037         }
1038         SCTP_INP_RUNLOCK(inp);
1039         /* Scoping things for v6 */
1040         if ((error = sa6_recoverscope(sin6)) != 0) {
1041                 SCTP_FREE_SONAME(sin6);
1042                 return (error);
1043         }
1044         (*addr) = (struct sockaddr *)sin6;
1045         return (0);
1046 }
1047
1048 static int
1049 sctp6_peeraddr(struct socket *so, struct sockaddr **addr)
1050 {
1051         struct sockaddr_in6 *sin6;
1052         int fnd;
1053         struct sockaddr_in6 *sin_a6;
1054         struct sctp_inpcb *inp;
1055         struct sctp_tcb *stcb;
1056         struct sctp_nets *net;
1057         int error;
1058
1059         /* Do the malloc first in case it blocks. */
1060         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1061         if (sin6 == NULL)
1062                 return (ENOMEM);
1063         sin6->sin6_family = AF_INET6;
1064         sin6->sin6_len = sizeof(*sin6);
1065
1066         inp = (struct sctp_inpcb *)so->so_pcb;
1067         if ((inp == NULL) ||
1068             ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
1069                 /* UDP type and listeners will drop out here */
1070                 SCTP_FREE_SONAME(sin6);
1071                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN);
1072                 return (ENOTCONN);
1073         }
1074         SCTP_INP_RLOCK(inp);
1075         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1076         if (stcb) {
1077                 SCTP_TCB_LOCK(stcb);
1078         }
1079         SCTP_INP_RUNLOCK(inp);
1080         if (stcb == NULL) {
1081                 SCTP_FREE_SONAME(sin6);
1082                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1083                 return (ECONNRESET);
1084         }
1085         fnd = 0;
1086         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1087                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1088                 if (sin_a6->sin6_family == AF_INET6) {
1089                         fnd = 1;
1090                         sin6->sin6_port = stcb->rport;
1091                         sin6->sin6_addr = sin_a6->sin6_addr;
1092                         break;
1093                 }
1094         }
1095         SCTP_TCB_UNLOCK(stcb);
1096         if (!fnd) {
1097                 /* No IPv4 address */
1098                 SCTP_FREE_SONAME(sin6);
1099                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1100                 return (ENOENT);
1101         }
1102         if ((error = sa6_recoverscope(sin6)) != 0) {
1103                 SCTP_FREE_SONAME(sin6);
1104                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, error);
1105                 return (error);
1106         }
1107         *addr = (struct sockaddr *)sin6;
1108         return (0);
1109 }
1110
1111 static int
1112 sctp6_in6getaddr(struct socket *so, struct sockaddr **nam)
1113 {
1114         struct in6pcb *inp6 = sotoin6pcb(so);
1115         int error;
1116
1117         if (inp6 == NULL) {
1118                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1119                 return (EINVAL);
1120         }
1121         /* allow v6 addresses precedence */
1122         error = sctp6_getaddr(so, nam);
1123 #ifdef INET
1124         if (error) {
1125                 struct sockaddr_in6 *sin6;
1126
1127                 /* try v4 next if v6 failed */
1128                 error = sctp_ingetaddr(so, nam);
1129                 if (error) {
1130                         return (error);
1131                 }
1132                 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1133                 if (sin6 == NULL) {
1134                         SCTP_FREE_SONAME(*nam);
1135                         return (ENOMEM);
1136                 }
1137                 in6_sin_2_v4mapsin6((struct sockaddr_in *)*nam, sin6);
1138                 SCTP_FREE_SONAME(*nam);
1139                 *nam = (struct sockaddr *)sin6;
1140         }
1141 #endif
1142         return (error);
1143 }
1144
1145
1146 static int
1147 sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
1148 {
1149         struct in6pcb *inp6 = sotoin6pcb(so);
1150         int error;
1151
1152         if (inp6 == NULL) {
1153                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1154                 return (EINVAL);
1155         }
1156         /* allow v6 addresses precedence */
1157         error = sctp6_peeraddr(so, nam);
1158 #ifdef INET
1159         if (error) {
1160                 struct sockaddr_in6 *sin6;
1161
1162                 /* try v4 next if v6 failed */
1163                 error = sctp_peeraddr(so, nam);
1164                 if (error) {
1165                         return (error);
1166                 }
1167                 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1168                 if (sin6 == NULL) {
1169                         SCTP_FREE_SONAME(*nam);
1170                         return (ENOMEM);
1171                 }
1172                 in6_sin_2_v4mapsin6((struct sockaddr_in *)*nam, sin6);
1173                 SCTP_FREE_SONAME(*nam);
1174                 *nam = (struct sockaddr *)sin6;
1175         }
1176 #endif
1177         return (error);
1178 }
1179
1180 struct pr_usrreqs sctp6_usrreqs = {
1181         .pru_abort = sctp6_abort,
1182         .pru_accept = sctp_accept,
1183         .pru_attach = sctp6_attach,
1184         .pru_bind = sctp6_bind,
1185         .pru_connect = sctp6_connect,
1186         .pru_control = in6_control,
1187         .pru_close = sctp6_close,
1188         .pru_detach = sctp6_close,
1189         .pru_sopoll = sopoll_generic,
1190         .pru_flush = sctp_flush,
1191         .pru_disconnect = sctp6_disconnect,
1192         .pru_listen = sctp_listen,
1193         .pru_peeraddr = sctp6_getpeeraddr,
1194         .pru_send = sctp6_send,
1195         .pru_shutdown = sctp_shutdown,
1196         .pru_sockaddr = sctp6_in6getaddr,
1197         .pru_sosend = sctp_sosend,
1198         .pru_soreceive = sctp_soreceive
1199 };
1200
1201 #endif