sys/netinet6/sctp6_usrreq.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
   5  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   6  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  * a) Redistributions of source code must retain the above copyright notice,
  12  *    this list of conditions and the following disclaimer.
  13  *
  14  * b) Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the distribution.
  17  *
  18  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  19  *    contributors may be used to endorse or promote products derived
  20  *    from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  24  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  32  * THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 __FBSDID("$FreeBSD$");
  37
  38 #include <netinet/sctp_os.h>
  39 #ifdef INET6
  40 #include <sys/proc.h>
  41 #include <netinet/sctp_pcb.h>
  42 #include <netinet/sctp_header.h>
  43 #include <netinet/sctp_var.h>
  44 #include <netinet6/sctp6_var.h>
  45 #include <netinet/sctp_sysctl.h>
  46 #include <netinet/sctp_output.h>
  47 #include <netinet/sctp_uio.h>
  48 #include <netinet/sctp_asconf.h>
  49 #include <netinet/sctputil.h>
  50 #include <netinet/sctp_indata.h>
  51 #include <netinet/sctp_timer.h>
  52 #include <netinet/sctp_auth.h>
  53 #include <netinet/sctp_input.h>
  54 #include <netinet/sctp_output.h>
  55 #include <netinet/sctp_bsd_addr.h>
  56 #include <netinet/sctp_crc32.h>
  57 #include <netinet/icmp6.h>
  58 #include <netinet/udp.h>
  59
  60 extern struct protosw inetsw[];
  61
  62 int
  63 sctp6_input_with_port(struct mbuf **i_pak, int *offp, uint16_t port)
  64 {
  65         struct mbuf *m;
  66         int iphlen;
  67         uint32_t vrf_id;
  68         uint8_t ecn_bits;
  69         struct sockaddr_in6 src, dst;
  70         struct ip6_hdr *ip6;
  71         struct sctphdr *sh;
  72         struct sctp_chunkhdr *ch;
  73         int length, offset;
  74         uint8_t compute_crc;
  75         uint32_t mflowid;
  76         uint8_t mflowtype;
  77         uint16_t fibnum;
  78
  79         iphlen = *offp;
  80         if (SCTP_GET_PKT_VRFID(*i_pak, vrf_id)) {
  81                 SCTP_RELEASE_PKT(*i_pak);
  82                 return (IPPROTO_DONE);
  83         }
  84         m = SCTP_HEADER_TO_CHAIN(*i_pak);
  85 #ifdef SCTP_MBUF_LOGGING
  86         /* Log in any input mbufs */
  87         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
  88                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
  89         }
  90 #endif
  91 #ifdef SCTP_PACKET_LOGGING
  92         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
  93                 sctp_packet_log(m);
  94         }
  95 #endif
  96         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
  97             "sctp6_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
  98             m->m_pkthdr.len,
  99             if_name(m->m_pkthdr.rcvif),
 100             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
 101         mflowid = m->m_pkthdr.flowid;
 102         mflowtype = M_HASHTYPE_GET(m);
 103         fibnum = M_GETFIB(m);
 104         SCTP_STAT_INCR(sctps_recvpackets);
 105         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
 106         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
 107         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
 108         ip6 = mtod(m, struct ip6_hdr *);
 109         IP6_EXTHDR_GET(sh, struct sctphdr *, m, iphlen,
 110             (int)(sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr)));
 111         if (sh == NULL) {
 112                 SCTP_STAT_INCR(sctps_hdrops);
 113                 return (IPPROTO_DONE);
 114         }
 115         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
 116         offset -= sizeof(struct sctp_chunkhdr);
 117         memset(&src, 0, sizeof(struct sockaddr_in6));
 118         src.sin6_family = AF_INET6;
 119         src.sin6_len = sizeof(struct sockaddr_in6);
 120         src.sin6_port = sh->src_port;
 121         src.sin6_addr = ip6->ip6_src;
 122         if (in6_setscope(&src.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
 123                 goto out;
 124         }
 125         memset(&dst, 0, sizeof(struct sockaddr_in6));
 126         dst.sin6_family = AF_INET6;
 127         dst.sin6_len = sizeof(struct sockaddr_in6);
 128         dst.sin6_port = sh->dest_port;
 129         dst.sin6_addr = ip6->ip6_dst;
 130         if (in6_setscope(&dst.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
 131                 goto out;
 132         }
 133         length = ntohs(ip6->ip6_plen) + iphlen;
 134         /* Validate mbuf chain length with IP payload length. */
 135         if (SCTP_HEADER_LEN(m) != length) {
 136                 SCTPDBG(SCTP_DEBUG_INPUT1,
 137                     "sctp6_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
 138                 SCTP_STAT_INCR(sctps_hdrops);
 139                 goto out;
 140         }
 141         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 142                 goto out;
 143         }
 144         ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff);
 145         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
 146                 SCTP_STAT_INCR(sctps_recvhwcrc);
 147                 compute_crc = 0;
 148         } else {
 149                 SCTP_STAT_INCR(sctps_recvswcrc);
 150                 compute_crc = 1;
 151         }
 152         sctp_common_input_processing(&m, iphlen, offset, length,
 153             (struct sockaddr *)&src,
 154             (struct sockaddr *)&dst,
 155             sh, ch,
 156             compute_crc,
 157             ecn_bits,
 158             mflowtype, mflowid, fibnum,
 159             vrf_id, port);
 160 out:
 161         if (m) {
 162                 sctp_m_freem(m);
 163         }
 164         return (IPPROTO_DONE);
 165 }
 166
 167
 168 int
 169 sctp6_input(struct mbuf **i_pak, int *offp, int proto SCTP_UNUSED)
 170 {
 171         return (sctp6_input_with_port(i_pak, offp, 0));
 172 }
 173
 174 void
 175 sctp6_notify(struct sctp_inpcb *inp,
 176     struct sctp_tcb *stcb,
 177     struct sctp_nets *net,
 178     uint8_t icmp6_type,
 179     uint8_t icmp6_code,
 180     uint32_t next_mtu)
 181 {
 182 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 183         struct socket *so;
 184 #endif
 185         int timer_stopped;
 186
 187         switch (icmp6_type) {
 188         case ICMP6_DST_UNREACH:
 189                 if ((icmp6_code == ICMP6_DST_UNREACH_NOROUTE) ||
 190                     (icmp6_code == ICMP6_DST_UNREACH_ADMIN) ||
 191                     (icmp6_code == ICMP6_DST_UNREACH_BEYONDSCOPE) ||
 192                     (icmp6_code == ICMP6_DST_UNREACH_ADDR)) {
 193                         /* Mark the net unreachable. */
 194                         if (net->dest_state & SCTP_ADDR_REACHABLE) {
 195                                 /* Ok that destination is not reachable */
 196                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
 197                                 net->dest_state &= ~SCTP_ADDR_PF;
 198                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
 199                                     stcb, 0, (void *)net, SCTP_SO_NOT_LOCKED);
 200                         }
 201                 }
 202                 SCTP_TCB_UNLOCK(stcb);
 203                 break;
 204         case ICMP6_PARAM_PROB:
 205                 /* Treat it like an ABORT. */
 206                 if (icmp6_code == ICMP6_PARAMPROB_NEXTHEADER) {
 207                         sctp_abort_notification(stcb, 1, 0, NULL, SCTP_SO_NOT_LOCKED);
 208 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 209                         so = SCTP_INP_SO(inp);
 210                         atomic_add_int(&stcb->asoc.refcnt, 1);
 211                         SCTP_TCB_UNLOCK(stcb);
 212                         SCTP_SOCKET_LOCK(so, 1);
 213                         SCTP_TCB_LOCK(stcb);
 214                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 215 #endif
 216                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
 217                             SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2);
 218 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 219                         SCTP_SOCKET_UNLOCK(so, 1);
 220 #endif
 221                 } else {
 222                         SCTP_TCB_UNLOCK(stcb);
 223                 }
 224                 break;
 225         case ICMP6_PACKET_TOO_BIG:
 226                 if (net->dest_state & SCTP_ADDR_NO_PMTUD) {
 227                         SCTP_TCB_UNLOCK(stcb);
 228                         break;
 229                 }
 230                 if (SCTP_OS_TIMER_PENDING(&net->pmtu_timer.timer)) {
 231                         timer_stopped = 1;
 232                         sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net,
 233                             SCTP_FROM_SCTP_USRREQ + SCTP_LOC_1);
 234                 } else {
 235                         timer_stopped = 0;
 236                 }
 237                 /* Update the path MTU. */
 238                 if (net->port) {
 239                         next_mtu -= sizeof(struct udphdr);
 240                 }
 241                 if (net->mtu > next_mtu) {
 242                         net->mtu = next_mtu;
 243                 }
 244                 /* Update the association MTU */
 245                 if (stcb->asoc.smallest_mtu > next_mtu) {
 246                         sctp_pathmtu_adjustment(stcb, next_mtu);
 247                 }
 248                 /* Finally, start the PMTU timer if it was running before. */
 249                 if (timer_stopped) {
 250                         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
 251                 }
 252                 SCTP_TCB_UNLOCK(stcb);
 253                 break;
 254         default:
 255                 SCTP_TCB_UNLOCK(stcb);
 256                 break;
 257         }
 258 }
 259
 260 void
 261 sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d)
 262 {
 263         struct ip6ctlparam *ip6cp;
 264         struct sctp_inpcb *inp;
 265         struct sctp_tcb *stcb;
 266         struct sctp_nets *net;
 267         struct sctphdr sh;
 268         struct sockaddr_in6 src, dst;
 269
 270         if (pktdst->sa_family != AF_INET6 ||
 271             pktdst->sa_len != sizeof(struct sockaddr_in6)) {
 272                 return;
 273         }
 274
 275         if ((unsigned)cmd >= PRC_NCMDS) {
 276                 return;
 277         }
 278         if (PRC_IS_REDIRECT(cmd)) {
 279                 d = NULL;
 280         } else if (inet6ctlerrmap[cmd] == 0) {
 281                 return;
 282         }
 283         /* If the parameter is from icmp6, decode it. */
 284         if (d != NULL) {
 285                 ip6cp = (struct ip6ctlparam *)d;
 286         } else {
 287                 ip6cp = (struct ip6ctlparam *)NULL;
 288         }
 289
 290         if (ip6cp != NULL) {
 291                 /*
 292                  * XXX: We assume that when IPV6 is non NULL, M and OFF are
 293                  * valid.
 294                  */
 295                 if (ip6cp->ip6c_m == NULL) {
 296                         return;
 297                 }
 298
 299                 /*
 300                  * Check if we can safely examine the ports and the
 301                  * verification tag of the SCTP common header.
 302                  */
 303                 if (ip6cp->ip6c_m->m_pkthdr.len <
 304                     (int32_t)(ip6cp->ip6c_off + offsetof(struct sctphdr, checksum))) {
 305                         return;
 306                 }
 307
 308                 /* Copy out the port numbers and the verification tag. */
 309                 memset(&sh, 0, sizeof(sh));
 310                 m_copydata(ip6cp->ip6c_m,
 311                     ip6cp->ip6c_off,
 312                     sizeof(uint16_t) + sizeof(uint16_t) + sizeof(uint32_t),
 313                     (caddr_t)&sh);
 314                 memset(&src, 0, sizeof(struct sockaddr_in6));
 315                 src.sin6_family = AF_INET6;
 316                 src.sin6_len = sizeof(struct sockaddr_in6);
 317                 src.sin6_port = sh.src_port;
 318                 src.sin6_addr = ip6cp->ip6c_ip6->ip6_src;
 319                 if (in6_setscope(&src.sin6_addr, ip6cp->ip6c_m->m_pkthdr.rcvif, NULL) != 0) {
 320                         return;
 321                 }
 322                 memset(&dst, 0, sizeof(struct sockaddr_in6));
 323                 dst.sin6_family = AF_INET6;
 324                 dst.sin6_len = sizeof(struct sockaddr_in6);
 325                 dst.sin6_port = sh.dest_port;
 326                 dst.sin6_addr = ip6cp->ip6c_ip6->ip6_dst;
 327                 if (in6_setscope(&dst.sin6_addr, ip6cp->ip6c_m->m_pkthdr.rcvif, NULL) != 0) {
 328                         return;
 329                 }
 330                 inp = NULL;
 331                 net = NULL;
 332                 stcb = sctp_findassociation_addr_sa((struct sockaddr *)&dst,
 333                     (struct sockaddr *)&src,
 334                     &inp, &net, 1, SCTP_DEFAULT_VRFID);
 335                 if ((stcb != NULL) &&
 336                     (net != NULL) &&
 337                     (inp != NULL)) {
 338                         /* Check the verification tag */
 339                         if (ntohl(sh.v_tag) != 0) {
 340                                 /*
 341                                  * This must be the verification tag used
 342                                  * for sending out packets. We don't
 343                                  * consider packets reflecting the
 344                                  * verification tag.
 345                                  */
 346                                 if (ntohl(sh.v_tag) != stcb->asoc.peer_vtag) {
 347                                         SCTP_TCB_UNLOCK(stcb);
 348                                         return;
 349                                 }
 350                         } else {
 351                                 if (ip6cp->ip6c_m->m_pkthdr.len >=
 352                                     ip6cp->ip6c_off + sizeof(struct sctphdr) +
 353                                     sizeof(struct sctp_chunkhdr) +
 354                                     offsetof(struct sctp_init, a_rwnd)) {
 355                                         /*
 356                                          * In this case we can check if we
 357                                          * got an INIT chunk and if the
 358                                          * initiate tag matches.
 359                                          */
 360                                         uint32_t initiate_tag;
 361                                         uint8_t chunk_type;
 362
 363                                         m_copydata(ip6cp->ip6c_m,
 364                                             ip6cp->ip6c_off +
 365                                             sizeof(struct sctphdr),
 366                                             sizeof(uint8_t),
 367                                             (caddr_t)&chunk_type);
 368                                         m_copydata(ip6cp->ip6c_m,
 369                                             ip6cp->ip6c_off +
 370                                             sizeof(struct sctphdr) +
 371                                             sizeof(struct sctp_chunkhdr),
 372                                             sizeof(uint32_t),
 373                                             (caddr_t)&initiate_tag);
 374                                         if ((chunk_type != SCTP_INITIATION) ||
 375                                             (ntohl(initiate_tag) != stcb->asoc.my_vtag)) {
 376                                                 SCTP_TCB_UNLOCK(stcb);
 377                                                 return;
 378                                         }
 379                                 } else {
 380                                         SCTP_TCB_UNLOCK(stcb);
 381                                         return;
 382                                 }
 383                         }
 384                         sctp6_notify(inp, stcb, net,
 385                             ip6cp->ip6c_icmp6->icmp6_type,
 386                             ip6cp->ip6c_icmp6->icmp6_code,
 387                             ntohl(ip6cp->ip6c_icmp6->icmp6_mtu));
 388                 } else {
 389                         if ((stcb == NULL) && (inp != NULL)) {
 390                                 /* reduce inp's ref-count */
 391                                 SCTP_INP_WLOCK(inp);
 392                                 SCTP_INP_DECR_REF(inp);
 393                                 SCTP_INP_WUNLOCK(inp);
 394                         }
 395                         if (stcb) {
 396                                 SCTP_TCB_UNLOCK(stcb);
 397                         }
 398                 }
 399         }
 400 }
 401
 402 /*
 403  * this routine can probably be collasped into the one in sctp_userreq.c
 404  * since they do the same thing and now we lookup with a sockaddr
 405  */
 406 static int
 407 sctp6_getcred(SYSCTL_HANDLER_ARGS)
 408 {
 409         struct xucred xuc;
 410         struct sockaddr_in6 addrs[2];
 411         struct sctp_inpcb *inp;
 412         struct sctp_nets *net;
 413         struct sctp_tcb *stcb;
 414         int error;
 415         uint32_t vrf_id;
 416
 417         vrf_id = SCTP_DEFAULT_VRFID;
 418
 419         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 420         if (error)
 421                 return (error);
 422
 423         if (req->newlen != sizeof(addrs)) {
 424                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 425                 return (EINVAL);
 426         }
 427         if (req->oldlen != sizeof(struct ucred)) {
 428                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 429                 return (EINVAL);
 430         }
 431         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 432         if (error)
 433                 return (error);
 434
 435         stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[1]),
 436             sin6tosa(&addrs[0]),
 437             &inp, &net, 1, vrf_id);
 438         if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) {
 439                 if ((inp != NULL) && (stcb == NULL)) {
 440                         /* reduce ref-count */
 441                         SCTP_INP_WLOCK(inp);
 442                         SCTP_INP_DECR_REF(inp);
 443                         goto cred_can_cont;
 444                 }
 445                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 446                 error = ENOENT;
 447                 goto out;
 448         }
 449         SCTP_TCB_UNLOCK(stcb);
 450         /*
 451          * We use the write lock here, only since in the error leg we need
 452          * it. If we used RLOCK, then we would have to
 453          * wlock/decr/unlock/rlock. Which in theory could create a hole.
 454          * Better to use higher wlock.
 455          */
 456         SCTP_INP_WLOCK(inp);
 457 cred_can_cont:
 458         error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket);
 459         if (error) {
 460                 SCTP_INP_WUNLOCK(inp);
 461                 goto out;
 462         }
 463         cru2x(inp->sctp_socket->so_cred, &xuc);
 464         SCTP_INP_WUNLOCK(inp);
 465         error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 466 out:
 467         return (error);
 468 }
 469
 470 SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW,
 471     0, 0,
 472     sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection");
 473
 474
 475 /* This is the same as the sctp_abort() could be made common */
 476 static void
 477 sctp6_abort(struct socket *so)
 478 {
 479         struct sctp_inpcb *inp;
 480         uint32_t flags;
 481
 482         inp = (struct sctp_inpcb *)so->so_pcb;
 483         if (inp == NULL) {
 484                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 485                 return;
 486         }
 487 sctp_must_try_again:
 488         flags = inp->sctp_flags;
 489 #ifdef SCTP_LOG_CLOSING
 490         sctp_log_closing(inp, NULL, 17);
 491 #endif
 492         if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) &&
 493             (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) {
 494 #ifdef SCTP_LOG_CLOSING
 495                 sctp_log_closing(inp, NULL, 16);
 496 #endif
 497                 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT,
 498                     SCTP_CALLED_AFTER_CMPSET_OFCLOSE);
 499                 SOCK_LOCK(so);
 500                 SCTP_SB_CLEAR(so->so_snd);
 501                 /*
 502                  * same for the rcv ones, they are only here for the
 503                  * accounting/select.
 504                  */
 505                 SCTP_SB_CLEAR(so->so_rcv);
 506                 /* Now null out the reference, we are completely detached. */
 507                 so->so_pcb = NULL;
 508                 SOCK_UNLOCK(so);
 509         } else {
 510                 flags = inp->sctp_flags;
 511                 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) {
 512                         goto sctp_must_try_again;
 513                 }
 514         }
 515         return;
 516 }
 517
 518 static int
 519 sctp6_attach(struct socket *so, int proto SCTP_UNUSED, struct thread *p SCTP_UNUSED)
 520 {
 521         int error;
 522         struct sctp_inpcb *inp;
 523         uint32_t vrf_id = SCTP_DEFAULT_VRFID;
 524
 525         inp = (struct sctp_inpcb *)so->so_pcb;
 526         if (inp != NULL) {
 527                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 528                 return (EINVAL);
 529         }
 530
 531         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 532                 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace));
 533                 if (error)
 534                         return (error);
 535         }
 536         error = sctp_inpcb_alloc(so, vrf_id);
 537         if (error)
 538                 return (error);
 539         inp = (struct sctp_inpcb *)so->so_pcb;
 540         SCTP_INP_WLOCK(inp);
 541         inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6;     /* I'm v6! */
 542
 543         inp->ip_inp.inp.inp_vflag |= INP_IPV6;
 544         inp->ip_inp.inp.in6p_hops = -1; /* use kernel default */
 545         inp->ip_inp.inp.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         inp->ip_inp.inp.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         int error;
 563
 564         inp = (struct sctp_inpcb *)so->so_pcb;
 565         if (inp == NULL) {
 566                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 567                 return (EINVAL);
 568         }
 569
 570         if (addr) {
 571                 switch (addr->sa_family) {
 572 #ifdef INET
 573                 case AF_INET:
 574                         if (addr->sa_len != sizeof(struct sockaddr_in)) {
 575                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 576                                 return (EINVAL);
 577                         }
 578                         break;
 579 #endif
 580 #ifdef INET6
 581                 case AF_INET6:
 582                         if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 583                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 584                                 return (EINVAL);
 585                         }
 586                         break;
 587 #endif
 588                 default:
 589                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 590                         return (EINVAL);
 591                 }
 592         }
 593         inp->ip_inp.inp.inp_vflag &= ~INP_IPV4;
 594         inp->ip_inp.inp.inp_vflag |= INP_IPV6;
 595         if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp) == 0)) {
 596                 switch (addr->sa_family) {
 597 #ifdef INET
 598                 case AF_INET:
 599                         /* binding v4 addr to v6 socket, so reset flags */
 600                         inp->ip_inp.inp.inp_vflag |= INP_IPV4;
 601                         inp->ip_inp.inp.inp_vflag &= ~INP_IPV6;
 602                         break;
 603 #endif
 604 #ifdef INET6
 605                 case AF_INET6:
 606                         {
 607                                 struct sockaddr_in6 *sin6_p;
 608
 609                                 sin6_p = (struct sockaddr_in6 *)addr;
 610
 611                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
 612                                         inp->ip_inp.inp.inp_vflag |= INP_IPV4;
 613                                 }
 614 #ifdef INET
 615                                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 616                                         struct sockaddr_in sin;
 617
 618                                         in6_sin6_2_sin(&sin, sin6_p);
 619                                         inp->ip_inp.inp.inp_vflag |= INP_IPV4;
 620                                         inp->ip_inp.inp.inp_vflag &= ~INP_IPV6;
 621                                         error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p);
 622                                         return (error);
 623                                 }
 624 #endif
 625                                 break;
 626                         }
 627 #endif
 628                 default:
 629                         break;
 630                 }
 631         } else if (addr != NULL) {
 632                 struct sockaddr_in6 *sin6_p;
 633
 634                 /* IPV6_V6ONLY socket */
 635 #ifdef INET
 636                 if (addr->sa_family == AF_INET) {
 637                         /* can't bind v4 addr to v6 only socket! */
 638                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 639                         return (EINVAL);
 640                 }
 641 #endif
 642                 sin6_p = (struct sockaddr_in6 *)addr;
 643
 644                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 645                         /* can't bind v4-mapped addrs either! */
 646                         /* NOTE: we don't support SIIT */
 647                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 648                         return (EINVAL);
 649                 }
 650         }
 651         error = sctp_inpcb_bind(so, addr, NULL, p);
 652         return (error);
 653 }
 654
 655
 656 static void
 657 sctp6_close(struct socket *so)
 658 {
 659         sctp_close(so);
 660 }
 661
 662 /* This could be made common with sctp_detach() since they are identical */
 663
 664 static
 665 int
 666 sctp6_disconnect(struct socket *so)
 667 {
 668         return (sctp_disconnect(so));
 669 }
 670
 671
 672 int
 673 sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 674     struct mbuf *control, struct thread *p);
 675
 676
 677 static int
 678 sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 679     struct mbuf *control, struct thread *p)
 680 {
 681         struct sctp_inpcb *inp;
 682
 683 #ifdef INET
 684         struct sockaddr_in6 *sin6;
 685 #endif                          /* INET */
 686         /* No SPL needed since sctp_output does this */
 687
 688         inp = (struct sctp_inpcb *)so->so_pcb;
 689         if (inp == NULL) {
 690                 if (control) {
 691                         SCTP_RELEASE_PKT(control);
 692                         control = NULL;
 693                 }
 694                 SCTP_RELEASE_PKT(m);
 695                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 696                 return (EINVAL);
 697         }
 698         /*
 699          * For the TCP model we may get a NULL addr, if we are a connected
 700          * socket thats ok.
 701          */
 702         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) &&
 703             (addr == NULL)) {
 704                 goto connected_type;
 705         }
 706         if (addr == NULL) {
 707                 SCTP_RELEASE_PKT(m);
 708                 if (control) {
 709                         SCTP_RELEASE_PKT(control);
 710                         control = NULL;
 711                 }
 712                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ);
 713                 return (EDESTADDRREQ);
 714         }
 715 #ifdef INET
 716         sin6 = (struct sockaddr_in6 *)addr;
 717         if (SCTP_IPV6_V6ONLY(inp)) {
 718                 /*
 719                  * if IPV6_V6ONLY flag, we discard datagrams destined to a
 720                  * v4 addr or v4-mapped addr
 721                  */
 722                 if (addr->sa_family == AF_INET) {
 723                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 724                         return (EINVAL);
 725                 }
 726                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 727                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 728                         return (EINVAL);
 729                 }
 730         }
 731         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 732                 struct sockaddr_in sin;
 733
 734                 /* convert v4-mapped into v4 addr and send */
 735                 in6_sin6_2_sin(&sin, sin6);
 736                 return (sctp_sendm(so, flags, m, (struct sockaddr *)&sin, control, p));
 737         }
 738 #endif                          /* INET */
 739 connected_type:
 740         /* now what about control */
 741         if (control) {
 742                 if (inp->control) {
 743                         SCTP_PRINTF("huh? control set?\n");
 744                         SCTP_RELEASE_PKT(inp->control);
 745                         inp->control = NULL;
 746                 }
 747                 inp->control = control;
 748         }
 749         /* Place the data */
 750         if (inp->pkt) {
 751                 SCTP_BUF_NEXT(inp->pkt_last) = m;
 752                 inp->pkt_last = m;
 753         } else {
 754                 inp->pkt_last = inp->pkt = m;
 755         }
 756         if (
 757         /* FreeBSD and MacOSX uses a flag passed */
 758             ((flags & PRUS_MORETOCOME) == 0)
 759             ) {
 760                 /*
 761                  * note with the current version this code will only be used
 762                  * by OpenBSD, NetBSD and FreeBSD have methods for
 763                  * re-defining sosend() to use sctp_sosend().  One can
 764                  * optionaly switch back to this code (by changing back the
 765                  * defininitions but this is not advisable.
 766                  */
 767                 int ret;
 768
 769                 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
 770                 inp->pkt = NULL;
 771                 inp->control = NULL;
 772                 return (ret);
 773         } else {
 774                 return (0);
 775         }
 776 }
 777
 778 static int
 779 sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
 780 {
 781         uint32_t vrf_id;
 782         int error = 0;
 783         struct sctp_inpcb *inp;
 784         struct sctp_tcb *stcb;
 785 #ifdef INET
 786         struct sockaddr_in6 *sin6;
 787         union sctp_sockstore store;
 788 #endif
 789
 790         inp = (struct sctp_inpcb *)so->so_pcb;
 791         if (inp == NULL) {
 792                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 793                 return (ECONNRESET);    /* I made the same as TCP since we are
 794                                          * not setup? */
 795         }
 796         if (addr == NULL) {
 797                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 798                 return (EINVAL);
 799         }
 800         switch (addr->sa_family) {
 801 #ifdef INET
 802         case AF_INET:
 803                 if (addr->sa_len != sizeof(struct sockaddr_in)) {
 804                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 805                         return (EINVAL);
 806                 }
 807                 break;
 808 #endif
 809 #ifdef INET6
 810         case AF_INET6:
 811                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 812                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 813                         return (EINVAL);
 814                 }
 815                 break;
 816 #endif
 817         default:
 818                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 819                 return (EINVAL);
 820         }
 821
 822         vrf_id = inp->def_vrf_id;
 823         SCTP_ASOC_CREATE_LOCK(inp);
 824         SCTP_INP_RLOCK(inp);
 825         if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) ==
 826             SCTP_PCB_FLAGS_UNBOUND) {
 827                 /* Bind a ephemeral port */
 828                 SCTP_INP_RUNLOCK(inp);
 829                 error = sctp6_bind(so, NULL, p);
 830                 if (error) {
 831                         SCTP_ASOC_CREATE_UNLOCK(inp);
 832
 833                         return (error);
 834                 }
 835                 SCTP_INP_RLOCK(inp);
 836         }
 837         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
 838             (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) {
 839                 /* We are already connected AND the TCP model */
 840                 SCTP_INP_RUNLOCK(inp);
 841                 SCTP_ASOC_CREATE_UNLOCK(inp);
 842                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE);
 843                 return (EADDRINUSE);
 844         }
 845 #ifdef INET
 846         sin6 = (struct sockaddr_in6 *)addr;
 847         if (SCTP_IPV6_V6ONLY(inp)) {
 848                 /*
 849                  * if IPV6_V6ONLY flag, ignore connections destined to a v4
 850                  * addr or v4-mapped addr
 851                  */
 852                 if (addr->sa_family == AF_INET) {
 853                         SCTP_INP_RUNLOCK(inp);
 854                         SCTP_ASOC_CREATE_UNLOCK(inp);
 855                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 856                         return (EINVAL);
 857                 }
 858                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 859                         SCTP_INP_RUNLOCK(inp);
 860                         SCTP_ASOC_CREATE_UNLOCK(inp);
 861                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 862                         return (EINVAL);
 863                 }
 864         }
 865         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 866                 /* convert v4-mapped into v4 addr */
 867                 in6_sin6_2_sin(&store.sin, sin6);
 868                 addr = &store.sa;
 869         }
 870 #endif                          /* INET */
 871         /* Now do we connect? */
 872         if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
 873                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
 874                 if (stcb) {
 875                         SCTP_TCB_LOCK(stcb);
 876                 }
 877                 SCTP_INP_RUNLOCK(inp);
 878         } else {
 879                 SCTP_INP_RUNLOCK(inp);
 880                 SCTP_INP_WLOCK(inp);
 881                 SCTP_INP_INCR_REF(inp);
 882                 SCTP_INP_WUNLOCK(inp);
 883                 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL);
 884                 if (stcb == NULL) {
 885                         SCTP_INP_WLOCK(inp);
 886                         SCTP_INP_DECR_REF(inp);
 887                         SCTP_INP_WUNLOCK(inp);
 888                 }
 889         }
 890
 891         if (stcb != NULL) {
 892                 /* Already have or am bring up an association */
 893                 SCTP_ASOC_CREATE_UNLOCK(inp);
 894                 SCTP_TCB_UNLOCK(stcb);
 895                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY);
 896                 return (EALREADY);
 897         }
 898         /* We are GOOD to go */
 899         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
 900             inp->sctp_ep.pre_open_stream_count,
 901             inp->sctp_ep.port, p,
 902             SCTP_INITIALIZE_AUTH_PARAMS);
 903         SCTP_ASOC_CREATE_UNLOCK(inp);
 904         if (stcb == NULL) {
 905                 /* Gak! no memory */
 906                 return (error);
 907         }
 908         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
 909                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
 910                 /* Set the connected flag so we can queue data */
 911                 soisconnecting(so);
 912         }
 913         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
 914         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
 915         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
 916         SCTP_TCB_UNLOCK(stcb);
 917         return (error);
 918 }
 919
 920 static int
 921 sctp6_getaddr(struct socket *so, struct sockaddr **addr)
 922 {
 923         struct sockaddr_in6 *sin6;
 924         struct sctp_inpcb *inp;
 925         uint32_t vrf_id;
 926         struct sctp_ifa *sctp_ifa;
 927
 928         int error;
 929
 930         /*
 931          * Do the malloc first in case it blocks.
 932          */
 933         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof(*sin6));
 934         if (sin6 == NULL)
 935                 return (ENOMEM);
 936         sin6->sin6_family = AF_INET6;
 937         sin6->sin6_len = sizeof(*sin6);
 938
 939         inp = (struct sctp_inpcb *)so->so_pcb;
 940         if (inp == NULL) {
 941                 SCTP_FREE_SONAME(sin6);
 942                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 943                 return (ECONNRESET);
 944         }
 945         SCTP_INP_RLOCK(inp);
 946         sin6->sin6_port = inp->sctp_lport;
 947         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
 948                 /* For the bound all case you get back 0 */
 949                 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
 950                         struct sctp_tcb *stcb;
 951                         struct sockaddr_in6 *sin_a6;
 952                         struct sctp_nets *net;
 953                         int fnd;
 954
 955                         stcb = LIST_FIRST(&inp->sctp_asoc_list);
 956                         if (stcb == NULL) {
 957                                 SCTP_INP_RUNLOCK(inp);
 958                                 SCTP_FREE_SONAME(sin6);
 959                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 960                                 return (ENOENT);
 961                         }
 962                         fnd = 0;
 963                         sin_a6 = NULL;
 964                         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 965                                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 966                                 if (sin_a6 == NULL)
 967                                         /* this will make coverity happy */
 968                                         continue;
 969
 970                                 if (sin_a6->sin6_family == AF_INET6) {
 971                                         fnd = 1;
 972                                         break;
 973                                 }
 974                         }
 975                         if ((!fnd) || (sin_a6 == NULL)) {
 976                                 /* punt */
 977                                 SCTP_INP_RUNLOCK(inp);
 978                                 SCTP_FREE_SONAME(sin6);
 979                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 980                                 return (ENOENT);
 981                         }
 982                         vrf_id = inp->def_vrf_id;
 983                         sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *)&net->ro, net, 0, vrf_id);
 984                         if (sctp_ifa) {
 985                                 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr;
 986                         }
 987                 } else {
 988                         /* For the bound all case you get back 0 */
 989                         memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr));
 990                 }
 991         } else {
 992                 /* Take the first IPv6 address in the list */
 993                 struct sctp_laddr *laddr;
 994                 int fnd = 0;
 995
 996                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
 997                         if (laddr->ifa->address.sa.sa_family == AF_INET6) {
 998                                 struct sockaddr_in6 *sin_a;
 999
1000                                 sin_a = &laddr->ifa->address.sin6;
1001                                 sin6->sin6_addr = sin_a->sin6_addr;
1002                                 fnd = 1;
1003                                 break;
1004                         }
1005                 }
1006                 if (!fnd) {
1007                         SCTP_FREE_SONAME(sin6);
1008                         SCTP_INP_RUNLOCK(inp);
1009                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1010                         return (ENOENT);
1011                 }
1012         }
1013         SCTP_INP_RUNLOCK(inp);
1014         /* Scoping things for v6 */
1015         if ((error = sa6_recoverscope(sin6)) != 0) {
1016                 SCTP_FREE_SONAME(sin6);
1017                 return (error);
1018         }
1019         (*addr) = (struct sockaddr *)sin6;
1020         return (0);
1021 }
1022
1023 static int
1024 sctp6_peeraddr(struct socket *so, struct sockaddr **addr)
1025 {
1026         struct sockaddr_in6 *sin6;
1027         int fnd;
1028         struct sockaddr_in6 *sin_a6;
1029         struct sctp_inpcb *inp;
1030         struct sctp_tcb *stcb;
1031         struct sctp_nets *net;
1032         int error;
1033
1034         /* Do the malloc first in case it blocks. */
1035         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1036         if (sin6 == NULL)
1037                 return (ENOMEM);
1038         sin6->sin6_family = AF_INET6;
1039         sin6->sin6_len = sizeof(*sin6);
1040
1041         inp = (struct sctp_inpcb *)so->so_pcb;
1042         if ((inp == NULL) ||
1043             ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
1044                 /* UDP type and listeners will drop out here */
1045                 SCTP_FREE_SONAME(sin6);
1046                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN);
1047                 return (ENOTCONN);
1048         }
1049         SCTP_INP_RLOCK(inp);
1050         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1051         if (stcb) {
1052                 SCTP_TCB_LOCK(stcb);
1053         }
1054         SCTP_INP_RUNLOCK(inp);
1055         if (stcb == NULL) {
1056                 SCTP_FREE_SONAME(sin6);
1057                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1058                 return (ECONNRESET);
1059         }
1060         fnd = 0;
1061         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1062                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1063                 if (sin_a6->sin6_family == AF_INET6) {
1064                         fnd = 1;
1065                         sin6->sin6_port = stcb->rport;
1066                         sin6->sin6_addr = sin_a6->sin6_addr;
1067                         break;
1068                 }
1069         }
1070         SCTP_TCB_UNLOCK(stcb);
1071         if (!fnd) {
1072                 /* No IPv4 address */
1073                 SCTP_FREE_SONAME(sin6);
1074                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1075                 return (ENOENT);
1076         }
1077         if ((error = sa6_recoverscope(sin6)) != 0) {
1078                 SCTP_FREE_SONAME(sin6);
1079                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, error);
1080                 return (error);
1081         }
1082         *addr = (struct sockaddr *)sin6;
1083         return (0);
1084 }
1085
1086 static int
1087 sctp6_in6getaddr(struct socket *so, struct sockaddr **nam)
1088 {
1089         struct inpcb *inp = sotoinpcb(so);
1090         int error;
1091
1092         if (inp == NULL) {
1093                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1094                 return (EINVAL);
1095         }
1096
1097         /* allow v6 addresses precedence */
1098         error = sctp6_getaddr(so, nam);
1099 #ifdef INET
1100         if (error) {
1101                 struct sockaddr_in6 *sin6;
1102
1103                 /* try v4 next if v6 failed */
1104                 error = sctp_ingetaddr(so, nam);
1105                 if (error) {
1106                         return (error);
1107                 }
1108                 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1109                 if (sin6 == NULL) {
1110                         SCTP_FREE_SONAME(*nam);
1111                         return (ENOMEM);
1112                 }
1113                 in6_sin_2_v4mapsin6((struct sockaddr_in *)*nam, sin6);
1114                 SCTP_FREE_SONAME(*nam);
1115                 *nam = (struct sockaddr *)sin6;
1116         }
1117 #endif
1118         return (error);
1119 }
1120
1121
1122 static int
1123 sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
1124 {
1125         struct inpcb *inp = sotoinpcb(so);
1126         int error;
1127
1128         if (inp == NULL) {
1129                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1130                 return (EINVAL);
1131         }
1132
1133         /* allow v6 addresses precedence */
1134         error = sctp6_peeraddr(so, nam);
1135 #ifdef INET
1136         if (error) {
1137                 struct sockaddr_in6 *sin6;
1138
1139                 /* try v4 next if v6 failed */
1140                 error = sctp_peeraddr(so, nam);
1141                 if (error) {
1142                         return (error);
1143                 }
1144                 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1145                 if (sin6 == NULL) {
1146                         SCTP_FREE_SONAME(*nam);
1147                         return (ENOMEM);
1148                 }
1149                 in6_sin_2_v4mapsin6((struct sockaddr_in *)*nam, sin6);
1150                 SCTP_FREE_SONAME(*nam);
1151                 *nam = (struct sockaddr *)sin6;
1152         }
1153 #endif
1154         return (error);
1155 }
1156
1157 struct pr_usrreqs sctp6_usrreqs = {
1158         .pru_abort = sctp6_abort,
1159         .pru_accept = sctp_accept,
1160         .pru_attach = sctp6_attach,
1161         .pru_bind = sctp6_bind,
1162         .pru_connect = sctp6_connect,
1163         .pru_control = in6_control,
1164         .pru_close = sctp6_close,
1165         .pru_detach = sctp6_close,
1166         .pru_sopoll = sopoll_generic,
1167         .pru_flush = sctp_flush,
1168         .pru_disconnect = sctp6_disconnect,
1169         .pru_listen = sctp_listen,
1170         .pru_peeraddr = sctp6_getpeeraddr,
1171         .pru_send = sctp6_send,
1172         .pru_shutdown = sctp_shutdown,
1173         .pru_sockaddr = sctp6_in6getaddr,
1174         .pru_sosend = sctp_sosend,
1175         .pru_soreceive = sctp_soreceive
1176 };
1177
1178 #endif