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         u_char vflagsav;
 564
 565         inp = (struct sctp_inpcb *)so->so_pcb;
 566         if (inp == NULL) {
 567                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 568                 return (EINVAL);
 569         }
 570
 571         if (addr) {
 572                 switch (addr->sa_family) {
 573 #ifdef INET
 574                 case AF_INET:
 575                         if (addr->sa_len != sizeof(struct sockaddr_in)) {
 576                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 577                                 return (EINVAL);
 578                         }
 579                         break;
 580 #endif
 581 #ifdef INET6
 582                 case AF_INET6:
 583                         if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 584                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 585                                 return (EINVAL);
 586                         }
 587                         break;
 588 #endif
 589                 default:
 590                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 591                         return (EINVAL);
 592                 }
 593         }
 594         vflagsav = inp->ip_inp.inp.inp_vflag;
 595         inp->ip_inp.inp.inp_vflag &= ~INP_IPV4;
 596         inp->ip_inp.inp.inp_vflag |= INP_IPV6;
 597         if ((addr != NULL) && (SCTP_IPV6_V6ONLY(&inp->ip_inp.inp) == 0)) {
 598                 switch (addr->sa_family) {
 599 #ifdef INET
 600                 case AF_INET:
 601                         /* binding v4 addr to v6 socket, so reset flags */
 602                         inp->ip_inp.inp.inp_vflag |= INP_IPV4;
 603                         inp->ip_inp.inp.inp_vflag &= ~INP_IPV6;
 604                         break;
 605 #endif
 606 #ifdef INET6
 607                 case AF_INET6:
 608                         {
 609                                 struct sockaddr_in6 *sin6_p;
 610
 611                                 sin6_p = (struct sockaddr_in6 *)addr;
 612
 613                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
 614                                         inp->ip_inp.inp.inp_vflag |= INP_IPV4;
 615                                 }
 616 #ifdef INET
 617                                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 618                                         struct sockaddr_in sin;
 619
 620                                         in6_sin6_2_sin(&sin, sin6_p);
 621                                         inp->ip_inp.inp.inp_vflag |= INP_IPV4;
 622                                         inp->ip_inp.inp.inp_vflag &= ~INP_IPV6;
 623                                         error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p);
 624                                         goto out;
 625                                 }
 626 #endif
 627                                 break;
 628                         }
 629 #endif
 630                 default:
 631                         break;
 632                 }
 633         } else if (addr != NULL) {
 634                 struct sockaddr_in6 *sin6_p;
 635
 636                 /* IPV6_V6ONLY socket */
 637 #ifdef INET
 638                 if (addr->sa_family == AF_INET) {
 639                         /* can't bind v4 addr to v6 only socket! */
 640                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 641                         error = EINVAL;
 642                         goto out;
 643                 }
 644 #endif
 645                 sin6_p = (struct sockaddr_in6 *)addr;
 646
 647                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 648                         /* can't bind v4-mapped addrs either! */
 649                         /* NOTE: we don't support SIIT */
 650                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 651                         error = EINVAL;
 652                         goto out;
 653                 }
 654         }
 655         error = sctp_inpcb_bind(so, addr, NULL, p);
 656 out:
 657         if (error != 0)
 658                 inp->ip_inp.inp.inp_vflag = vflagsav;
 659         return (error);
 660 }
 661
 662
 663 static void
 664 sctp6_close(struct socket *so)
 665 {
 666         sctp_close(so);
 667 }
 668
 669 /* This could be made common with sctp_detach() since they are identical */
 670
 671 static
 672 int
 673 sctp6_disconnect(struct socket *so)
 674 {
 675         return (sctp_disconnect(so));
 676 }
 677
 678
 679 int
 680 sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 681     struct mbuf *control, struct thread *p);
 682
 683
 684 static int
 685 sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 686     struct mbuf *control, struct thread *p)
 687 {
 688         struct sctp_inpcb *inp;
 689
 690 #ifdef INET
 691         struct sockaddr_in6 *sin6;
 692 #endif                          /* INET */
 693         /* No SPL needed since sctp_output does this */
 694
 695         inp = (struct sctp_inpcb *)so->so_pcb;
 696         if (inp == NULL) {
 697                 if (control) {
 698                         SCTP_RELEASE_PKT(control);
 699                         control = NULL;
 700                 }
 701                 SCTP_RELEASE_PKT(m);
 702                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 703                 return (EINVAL);
 704         }
 705         /*
 706          * For the TCP model we may get a NULL addr, if we are a connected
 707          * socket thats ok.
 708          */
 709         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) &&
 710             (addr == NULL)) {
 711                 goto connected_type;
 712         }
 713         if (addr == NULL) {
 714                 SCTP_RELEASE_PKT(m);
 715                 if (control) {
 716                         SCTP_RELEASE_PKT(control);
 717                         control = NULL;
 718                 }
 719                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ);
 720                 return (EDESTADDRREQ);
 721         }
 722 #ifdef INET
 723         sin6 = (struct sockaddr_in6 *)addr;
 724         if (SCTP_IPV6_V6ONLY(inp)) {
 725                 /*
 726                  * if IPV6_V6ONLY flag, we discard datagrams destined to a
 727                  * v4 addr or v4-mapped addr
 728                  */
 729                 if (addr->sa_family == AF_INET) {
 730                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 731                         return (EINVAL);
 732                 }
 733                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 734                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 735                         return (EINVAL);
 736                 }
 737         }
 738         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 739                 struct sockaddr_in sin;
 740
 741                 /* convert v4-mapped into v4 addr and send */
 742                 in6_sin6_2_sin(&sin, sin6);
 743                 return (sctp_sendm(so, flags, m, (struct sockaddr *)&sin, control, p));
 744         }
 745 #endif                          /* INET */
 746 connected_type:
 747         /* now what about control */
 748         if (control) {
 749                 if (inp->control) {
 750                         SCTP_PRINTF("huh? control set?\n");
 751                         SCTP_RELEASE_PKT(inp->control);
 752                         inp->control = NULL;
 753                 }
 754                 inp->control = control;
 755         }
 756         /* Place the data */
 757         if (inp->pkt) {
 758                 SCTP_BUF_NEXT(inp->pkt_last) = m;
 759                 inp->pkt_last = m;
 760         } else {
 761                 inp->pkt_last = inp->pkt = m;
 762         }
 763         if (
 764         /* FreeBSD and MacOSX uses a flag passed */
 765             ((flags & PRUS_MORETOCOME) == 0)
 766             ) {
 767                 /*
 768                  * note with the current version this code will only be used
 769                  * by OpenBSD, NetBSD and FreeBSD have methods for
 770                  * re-defining sosend() to use sctp_sosend().  One can
 771                  * optionaly switch back to this code (by changing back the
 772                  * defininitions but this is not advisable.
 773                  */
 774                 int ret;
 775
 776                 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
 777                 inp->pkt = NULL;
 778                 inp->control = NULL;
 779                 return (ret);
 780         } else {
 781                 return (0);
 782         }
 783 }
 784
 785 static int
 786 sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
 787 {
 788         uint32_t vrf_id;
 789         int error = 0;
 790         struct sctp_inpcb *inp;
 791         struct sctp_tcb *stcb;
 792 #ifdef INET
 793         struct sockaddr_in6 *sin6;
 794         union sctp_sockstore store;
 795 #endif
 796
 797         inp = (struct sctp_inpcb *)so->so_pcb;
 798         if (inp == NULL) {
 799                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 800                 return (ECONNRESET);    /* I made the same as TCP since we are
 801                                          * not setup? */
 802         }
 803         if (addr == NULL) {
 804                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 805                 return (EINVAL);
 806         }
 807         switch (addr->sa_family) {
 808 #ifdef INET
 809         case AF_INET:
 810                 if (addr->sa_len != sizeof(struct sockaddr_in)) {
 811                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 812                         return (EINVAL);
 813                 }
 814                 break;
 815 #endif
 816 #ifdef INET6
 817         case AF_INET6:
 818                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 819                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 820                         return (EINVAL);
 821                 }
 822                 break;
 823 #endif
 824         default:
 825                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 826                 return (EINVAL);
 827         }
 828
 829         vrf_id = inp->def_vrf_id;
 830         SCTP_ASOC_CREATE_LOCK(inp);
 831         SCTP_INP_RLOCK(inp);
 832         if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) ==
 833             SCTP_PCB_FLAGS_UNBOUND) {
 834                 /* Bind a ephemeral port */
 835                 SCTP_INP_RUNLOCK(inp);
 836                 error = sctp6_bind(so, NULL, p);
 837                 if (error) {
 838                         SCTP_ASOC_CREATE_UNLOCK(inp);
 839
 840                         return (error);
 841                 }
 842                 SCTP_INP_RLOCK(inp);
 843         }
 844         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
 845             (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) {
 846                 /* We are already connected AND the TCP model */
 847                 SCTP_INP_RUNLOCK(inp);
 848                 SCTP_ASOC_CREATE_UNLOCK(inp);
 849                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE);
 850                 return (EADDRINUSE);
 851         }
 852 #ifdef INET
 853         sin6 = (struct sockaddr_in6 *)addr;
 854         if (SCTP_IPV6_V6ONLY(inp)) {
 855                 /*
 856                  * if IPV6_V6ONLY flag, ignore connections destined to a v4
 857                  * addr or v4-mapped addr
 858                  */
 859                 if (addr->sa_family == AF_INET) {
 860                         SCTP_INP_RUNLOCK(inp);
 861                         SCTP_ASOC_CREATE_UNLOCK(inp);
 862                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 863                         return (EINVAL);
 864                 }
 865                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 866                         SCTP_INP_RUNLOCK(inp);
 867                         SCTP_ASOC_CREATE_UNLOCK(inp);
 868                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 869                         return (EINVAL);
 870                 }
 871         }
 872         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 873                 /* convert v4-mapped into v4 addr */
 874                 in6_sin6_2_sin(&store.sin, sin6);
 875                 addr = &store.sa;
 876         }
 877 #endif                          /* INET */
 878         /* Now do we connect? */
 879         if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
 880                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
 881                 if (stcb) {
 882                         SCTP_TCB_LOCK(stcb);
 883                 }
 884                 SCTP_INP_RUNLOCK(inp);
 885         } else {
 886                 SCTP_INP_RUNLOCK(inp);
 887                 SCTP_INP_WLOCK(inp);
 888                 SCTP_INP_INCR_REF(inp);
 889                 SCTP_INP_WUNLOCK(inp);
 890                 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL);
 891                 if (stcb == NULL) {
 892                         SCTP_INP_WLOCK(inp);
 893                         SCTP_INP_DECR_REF(inp);
 894                         SCTP_INP_WUNLOCK(inp);
 895                 }
 896         }
 897
 898         if (stcb != NULL) {
 899                 /* Already have or am bring up an association */
 900                 SCTP_ASOC_CREATE_UNLOCK(inp);
 901                 SCTP_TCB_UNLOCK(stcb);
 902                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY);
 903                 return (EALREADY);
 904         }
 905         /* We are GOOD to go */
 906         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
 907             inp->sctp_ep.pre_open_stream_count,
 908             inp->sctp_ep.port, p,
 909             SCTP_INITIALIZE_AUTH_PARAMS);
 910         SCTP_ASOC_CREATE_UNLOCK(inp);
 911         if (stcb == NULL) {
 912                 /* Gak! no memory */
 913                 return (error);
 914         }
 915         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
 916                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
 917                 /* Set the connected flag so we can queue data */
 918                 soisconnecting(so);
 919         }
 920         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
 921         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
 922         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
 923         SCTP_TCB_UNLOCK(stcb);
 924         return (error);
 925 }
 926
 927 static int
 928 sctp6_getaddr(struct socket *so, struct sockaddr **addr)
 929 {
 930         struct sockaddr_in6 *sin6;
 931         struct sctp_inpcb *inp;
 932         uint32_t vrf_id;
 933         struct sctp_ifa *sctp_ifa;
 934
 935         int error;
 936
 937         /*
 938          * Do the malloc first in case it blocks.
 939          */
 940         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof(*sin6));
 941         if (sin6 == NULL)
 942                 return (ENOMEM);
 943         sin6->sin6_family = AF_INET6;
 944         sin6->sin6_len = sizeof(*sin6);
 945
 946         inp = (struct sctp_inpcb *)so->so_pcb;
 947         if (inp == NULL) {
 948                 SCTP_FREE_SONAME(sin6);
 949                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 950                 return (ECONNRESET);
 951         }
 952         SCTP_INP_RLOCK(inp);
 953         sin6->sin6_port = inp->sctp_lport;
 954         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
 955                 /* For the bound all case you get back 0 */
 956                 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
 957                         struct sctp_tcb *stcb;
 958                         struct sockaddr_in6 *sin_a6;
 959                         struct sctp_nets *net;
 960                         int fnd;
 961
 962                         stcb = LIST_FIRST(&inp->sctp_asoc_list);
 963                         if (stcb == NULL) {
 964                                 SCTP_INP_RUNLOCK(inp);
 965                                 SCTP_FREE_SONAME(sin6);
 966                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 967                                 return (ENOENT);
 968                         }
 969                         fnd = 0;
 970                         sin_a6 = NULL;
 971                         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 972                                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 973                                 if (sin_a6 == NULL)
 974                                         /* this will make coverity happy */
 975                                         continue;
 976
 977                                 if (sin_a6->sin6_family == AF_INET6) {
 978                                         fnd = 1;
 979                                         break;
 980                                 }
 981                         }
 982                         if ((!fnd) || (sin_a6 == NULL)) {
 983                                 /* punt */
 984                                 SCTP_INP_RUNLOCK(inp);
 985                                 SCTP_FREE_SONAME(sin6);
 986                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 987                                 return (ENOENT);
 988                         }
 989                         vrf_id = inp->def_vrf_id;
 990                         sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *)&net->ro, net, 0, vrf_id);
 991                         if (sctp_ifa) {
 992                                 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr;
 993                         }
 994                 } else {
 995                         /* For the bound all case you get back 0 */
 996                         memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr));
 997                 }
 998         } else {
 999                 /* Take the first IPv6 address in the list */
1000                 struct sctp_laddr *laddr;
1001                 int fnd = 0;
1002
1003                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
1004                         if (laddr->ifa->address.sa.sa_family == AF_INET6) {
1005                                 struct sockaddr_in6 *sin_a;
1006
1007                                 sin_a = &laddr->ifa->address.sin6;
1008                                 sin6->sin6_addr = sin_a->sin6_addr;
1009                                 fnd = 1;
1010                                 break;
1011                         }
1012                 }
1013                 if (!fnd) {
1014                         SCTP_FREE_SONAME(sin6);
1015                         SCTP_INP_RUNLOCK(inp);
1016                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1017                         return (ENOENT);
1018                 }
1019         }
1020         SCTP_INP_RUNLOCK(inp);
1021         /* Scoping things for v6 */
1022         if ((error = sa6_recoverscope(sin6)) != 0) {
1023                 SCTP_FREE_SONAME(sin6);
1024                 return (error);
1025         }
1026         (*addr) = (struct sockaddr *)sin6;
1027         return (0);
1028 }
1029
1030 static int
1031 sctp6_peeraddr(struct socket *so, struct sockaddr **addr)
1032 {
1033         struct sockaddr_in6 *sin6;
1034         int fnd;
1035         struct sockaddr_in6 *sin_a6;
1036         struct sctp_inpcb *inp;
1037         struct sctp_tcb *stcb;
1038         struct sctp_nets *net;
1039         int error;
1040
1041         /* Do the malloc first in case it blocks. */
1042         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1043         if (sin6 == NULL)
1044                 return (ENOMEM);
1045         sin6->sin6_family = AF_INET6;
1046         sin6->sin6_len = sizeof(*sin6);
1047
1048         inp = (struct sctp_inpcb *)so->so_pcb;
1049         if ((inp == NULL) ||
1050             ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
1051                 /* UDP type and listeners will drop out here */
1052                 SCTP_FREE_SONAME(sin6);
1053                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN);
1054                 return (ENOTCONN);
1055         }
1056         SCTP_INP_RLOCK(inp);
1057         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1058         if (stcb) {
1059                 SCTP_TCB_LOCK(stcb);
1060         }
1061         SCTP_INP_RUNLOCK(inp);
1062         if (stcb == NULL) {
1063                 SCTP_FREE_SONAME(sin6);
1064                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1065                 return (ECONNRESET);
1066         }
1067         fnd = 0;
1068         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1069                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1070                 if (sin_a6->sin6_family == AF_INET6) {
1071                         fnd = 1;
1072                         sin6->sin6_port = stcb->rport;
1073                         sin6->sin6_addr = sin_a6->sin6_addr;
1074                         break;
1075                 }
1076         }
1077         SCTP_TCB_UNLOCK(stcb);
1078         if (!fnd) {
1079                 /* No IPv4 address */
1080                 SCTP_FREE_SONAME(sin6);
1081                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1082                 return (ENOENT);
1083         }
1084         if ((error = sa6_recoverscope(sin6)) != 0) {
1085                 SCTP_FREE_SONAME(sin6);
1086                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, error);
1087                 return (error);
1088         }
1089         *addr = (struct sockaddr *)sin6;
1090         return (0);
1091 }
1092
1093 static int
1094 sctp6_in6getaddr(struct socket *so, struct sockaddr **nam)
1095 {
1096         struct inpcb *inp = sotoinpcb(so);
1097         int error;
1098
1099         if (inp == NULL) {
1100                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1101                 return (EINVAL);
1102         }
1103
1104         /* allow v6 addresses precedence */
1105         error = sctp6_getaddr(so, nam);
1106 #ifdef INET
1107         if (error) {
1108                 struct sockaddr_in6 *sin6;
1109
1110                 /* try v4 next if v6 failed */
1111                 error = sctp_ingetaddr(so, nam);
1112                 if (error) {
1113                         return (error);
1114                 }
1115                 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1116                 if (sin6 == NULL) {
1117                         SCTP_FREE_SONAME(*nam);
1118                         return (ENOMEM);
1119                 }
1120                 in6_sin_2_v4mapsin6((struct sockaddr_in *)*nam, sin6);
1121                 SCTP_FREE_SONAME(*nam);
1122                 *nam = (struct sockaddr *)sin6;
1123         }
1124 #endif
1125         return (error);
1126 }
1127
1128
1129 static int
1130 sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
1131 {
1132         struct inpcb *inp = sotoinpcb(so);
1133         int error;
1134
1135         if (inp == NULL) {
1136                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1137                 return (EINVAL);
1138         }
1139
1140         /* allow v6 addresses precedence */
1141         error = sctp6_peeraddr(so, nam);
1142 #ifdef INET
1143         if (error) {
1144                 struct sockaddr_in6 *sin6;
1145
1146                 /* try v4 next if v6 failed */
1147                 error = sctp_peeraddr(so, nam);
1148                 if (error) {
1149                         return (error);
1150                 }
1151                 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1152                 if (sin6 == NULL) {
1153                         SCTP_FREE_SONAME(*nam);
1154                         return (ENOMEM);
1155                 }
1156                 in6_sin_2_v4mapsin6((struct sockaddr_in *)*nam, sin6);
1157                 SCTP_FREE_SONAME(*nam);
1158                 *nam = (struct sockaddr *)sin6;
1159         }
1160 #endif
1161         return (error);
1162 }
1163
1164 struct pr_usrreqs sctp6_usrreqs = {
1165         .pru_abort = sctp6_abort,
1166         .pru_accept = sctp_accept,
1167         .pru_attach = sctp6_attach,
1168         .pru_bind = sctp6_bind,
1169         .pru_connect = sctp6_connect,
1170         .pru_control = in6_control,
1171         .pru_close = sctp6_close,
1172         .pru_detach = sctp6_close,
1173         .pru_sopoll = sopoll_generic,
1174         .pru_flush = sctp_flush,
1175         .pru_disconnect = sctp6_disconnect,
1176         .pru_listen = sctp_listen,
1177         .pru_peeraddr = sctp6_getpeeraddr,
1178         .pru_send = sctp6_send,
1179         .pru_shutdown = sctp_shutdown,
1180         .pru_sockaddr = sctp6_in6getaddr,
1181         .pru_sosend = sctp_sosend,
1182         .pru_soreceive = sctp_soreceive
1183 };
1184
1185 #endif