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         struct in6pcb *inp6;
 522         int error;
 523         struct sctp_inpcb *inp;
 524         uint32_t vrf_id = SCTP_DEFAULT_VRFID;
 525
 526         inp = (struct sctp_inpcb *)so->so_pcb;
 527         if (inp != NULL) {
 528                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 529                 return (EINVAL);
 530         }
 531
 532         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 533                 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace));
 534                 if (error)
 535                         return (error);
 536         }
 537         error = sctp_inpcb_alloc(so, vrf_id);
 538         if (error)
 539                 return (error);
 540         inp = (struct sctp_inpcb *)so->so_pcb;
 541         SCTP_INP_WLOCK(inp);
 542         inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6;     /* I'm v6! */
 543         inp6 = (struct in6pcb *)inp;
 544
 545         inp6->inp_vflag |= INP_IPV6;
 546         inp6->in6p_hops = -1;   /* use kernel default */
 547         inp6->in6p_cksum = -1;  /* just to be sure */
 548 #ifdef INET
 549         /*
 550          * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6
 551          * socket as well, because the socket may be bound to an IPv6
 552          * wildcard address, which may match an IPv4-mapped IPv6 address.
 553          */
 554         inp6->inp_ip_ttl = MODULE_GLOBAL(ip_defttl);
 555 #endif
 556         SCTP_INP_WUNLOCK(inp);
 557         return (0);
 558 }
 559
 560 static int
 561 sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p)
 562 {
 563         struct sctp_inpcb *inp;
 564         struct in6pcb *inp6;
 565         int error;
 566         u_char vflagsav;
 567
 568         inp = (struct sctp_inpcb *)so->so_pcb;
 569         if (inp == NULL) {
 570                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 571                 return (EINVAL);
 572         }
 573
 574         if (addr) {
 575                 switch (addr->sa_family) {
 576 #ifdef INET
 577                 case AF_INET:
 578                         if (addr->sa_len != sizeof(struct sockaddr_in)) {
 579                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 580                                 return (EINVAL);
 581                         }
 582                         break;
 583 #endif
 584 #ifdef INET6
 585                 case AF_INET6:
 586                         if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 587                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 588                                 return (EINVAL);
 589                         }
 590                         break;
 591 #endif
 592                 default:
 593                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 594                         return (EINVAL);
 595                 }
 596         }
 597         inp6 = (struct in6pcb *)inp;
 598         vflagsav = inp6->inp_vflag;
 599         inp6->inp_vflag &= ~INP_IPV4;
 600         inp6->inp_vflag |= INP_IPV6;
 601         if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp6) == 0)) {
 602                 switch (addr->sa_family) {
 603 #ifdef INET
 604                 case AF_INET:
 605                         /* binding v4 addr to v6 socket, so reset flags */
 606                         inp6->inp_vflag |= INP_IPV4;
 607                         inp6->inp_vflag &= ~INP_IPV6;
 608                         break;
 609 #endif
 610 #ifdef INET6
 611                 case AF_INET6:
 612                         {
 613                                 struct sockaddr_in6 *sin6_p;
 614
 615                                 sin6_p = (struct sockaddr_in6 *)addr;
 616
 617                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
 618                                         inp6->inp_vflag |= INP_IPV4;
 619                                 }
 620 #ifdef INET
 621                                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 622                                         struct sockaddr_in sin;
 623
 624                                         in6_sin6_2_sin(&sin, sin6_p);
 625                                         inp6->inp_vflag |= INP_IPV4;
 626                                         inp6->inp_vflag &= ~INP_IPV6;
 627                                         error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p);
 628                                         goto out;
 629                                 }
 630 #endif
 631                                 break;
 632                         }
 633 #endif
 634                 default:
 635                         break;
 636                 }
 637         } else if (addr != NULL) {
 638                 struct sockaddr_in6 *sin6_p;
 639
 640                 /* IPV6_V6ONLY socket */
 641 #ifdef INET
 642                 if (addr->sa_family == AF_INET) {
 643                         /* can't bind v4 addr to v6 only socket! */
 644                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 645                         error = EINVAL;
 646                         goto out;
 647                 }
 648 #endif
 649                 sin6_p = (struct sockaddr_in6 *)addr;
 650
 651                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 652                         /* can't bind v4-mapped addrs either! */
 653                         /* NOTE: we don't support SIIT */
 654                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 655                         error = EINVAL;
 656                         goto out;
 657                 }
 658         }
 659         error = sctp_inpcb_bind(so, addr, NULL, p);
 660 out:
 661         if (error != 0)
 662                 inp6->inp_vflag = vflagsav;
 663         return (error);
 664 }
 665
 666
 667 static void
 668 sctp6_close(struct socket *so)
 669 {
 670         sctp_close(so);
 671 }
 672
 673 /* This could be made common with sctp_detach() since they are identical */
 674
 675 static
 676 int
 677 sctp6_disconnect(struct socket *so)
 678 {
 679         return (sctp_disconnect(so));
 680 }
 681
 682
 683 int
 684 sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 685     struct mbuf *control, struct thread *p);
 686
 687
 688 static int
 689 sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 690     struct mbuf *control, struct thread *p)
 691 {
 692         struct sctp_inpcb *inp;
 693         struct in6pcb *inp6;
 694
 695 #ifdef INET
 696         struct sockaddr_in6 *sin6;
 697 #endif                          /* INET */
 698         /* No SPL needed since sctp_output does this */
 699
 700         inp = (struct sctp_inpcb *)so->so_pcb;
 701         if (inp == NULL) {
 702                 if (control) {
 703                         SCTP_RELEASE_PKT(control);
 704                         control = NULL;
 705                 }
 706                 SCTP_RELEASE_PKT(m);
 707                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 708                 return (EINVAL);
 709         }
 710         inp6 = (struct in6pcb *)inp;
 711         /*
 712          * For the TCP model we may get a NULL addr, if we are a connected
 713          * socket thats ok.
 714          */
 715         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) &&
 716             (addr == NULL)) {
 717                 goto connected_type;
 718         }
 719         if (addr == NULL) {
 720                 SCTP_RELEASE_PKT(m);
 721                 if (control) {
 722                         SCTP_RELEASE_PKT(control);
 723                         control = NULL;
 724                 }
 725                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ);
 726                 return (EDESTADDRREQ);
 727         }
 728 #ifdef INET
 729         sin6 = (struct sockaddr_in6 *)addr;
 730         if (SCTP_IPV6_V6ONLY(inp6)) {
 731                 /*
 732                  * if IPV6_V6ONLY flag, we discard datagrams destined to a
 733                  * v4 addr or v4-mapped addr
 734                  */
 735                 if (addr->sa_family == AF_INET) {
 736                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 737                         return (EINVAL);
 738                 }
 739                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 740                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 741                         return (EINVAL);
 742                 }
 743         }
 744         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 745                 struct sockaddr_in sin;
 746
 747                 /* convert v4-mapped into v4 addr and send */
 748                 in6_sin6_2_sin(&sin, sin6);
 749                 return (sctp_sendm(so, flags, m, (struct sockaddr *)&sin, control, p));
 750         }
 751 #endif                          /* INET */
 752 connected_type:
 753         /* now what about control */
 754         if (control) {
 755                 if (inp->control) {
 756                         SCTP_PRINTF("huh? control set?\n");
 757                         SCTP_RELEASE_PKT(inp->control);
 758                         inp->control = NULL;
 759                 }
 760                 inp->control = control;
 761         }
 762         /* Place the data */
 763         if (inp->pkt) {
 764                 SCTP_BUF_NEXT(inp->pkt_last) = m;
 765                 inp->pkt_last = m;
 766         } else {
 767                 inp->pkt_last = inp->pkt = m;
 768         }
 769         if (
 770         /* FreeBSD and MacOSX uses a flag passed */
 771             ((flags & PRUS_MORETOCOME) == 0)
 772             ) {
 773                 /*
 774                  * note with the current version this code will only be used
 775                  * by OpenBSD, NetBSD and FreeBSD have methods for
 776                  * re-defining sosend() to use sctp_sosend().  One can
 777                  * optionaly switch back to this code (by changing back the
 778                  * defininitions but this is not advisable.
 779                  */
 780                 int ret;
 781
 782                 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
 783                 inp->pkt = NULL;
 784                 inp->control = NULL;
 785                 return (ret);
 786         } else {
 787                 return (0);
 788         }
 789 }
 790
 791 static int
 792 sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
 793 {
 794         uint32_t vrf_id;
 795         int error = 0;
 796         struct sctp_inpcb *inp;
 797         struct sctp_tcb *stcb;
 798 #ifdef INET
 799         struct in6pcb *inp6;
 800         struct sockaddr_in6 *sin6;
 801         union sctp_sockstore store;
 802 #endif
 803
 804 #ifdef INET
 805         inp6 = (struct in6pcb *)so->so_pcb;
 806 #endif
 807         inp = (struct sctp_inpcb *)so->so_pcb;
 808         if (inp == NULL) {
 809                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 810                 return (ECONNRESET);    /* I made the same as TCP since we are
 811                                          * not setup? */
 812         }
 813         if (addr == NULL) {
 814                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 815                 return (EINVAL);
 816         }
 817         switch (addr->sa_family) {
 818 #ifdef INET
 819         case AF_INET:
 820                 if (addr->sa_len != sizeof(struct sockaddr_in)) {
 821                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 822                         return (EINVAL);
 823                 }
 824                 break;
 825 #endif
 826 #ifdef INET6
 827         case AF_INET6:
 828                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 829                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 830                         return (EINVAL);
 831                 }
 832                 break;
 833 #endif
 834         default:
 835                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 836                 return (EINVAL);
 837         }
 838
 839         vrf_id = inp->def_vrf_id;
 840         SCTP_ASOC_CREATE_LOCK(inp);
 841         SCTP_INP_RLOCK(inp);
 842         if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) ==
 843             SCTP_PCB_FLAGS_UNBOUND) {
 844                 /* Bind a ephemeral port */
 845                 SCTP_INP_RUNLOCK(inp);
 846                 error = sctp6_bind(so, NULL, p);
 847                 if (error) {
 848                         SCTP_ASOC_CREATE_UNLOCK(inp);
 849
 850                         return (error);
 851                 }
 852                 SCTP_INP_RLOCK(inp);
 853         }
 854         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
 855             (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) {
 856                 /* We are already connected AND the TCP model */
 857                 SCTP_INP_RUNLOCK(inp);
 858                 SCTP_ASOC_CREATE_UNLOCK(inp);
 859                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE);
 860                 return (EADDRINUSE);
 861         }
 862 #ifdef INET
 863         sin6 = (struct sockaddr_in6 *)addr;
 864         if (SCTP_IPV6_V6ONLY(inp6)) {
 865                 /*
 866                  * if IPV6_V6ONLY flag, ignore connections destined to a v4
 867                  * addr or v4-mapped addr
 868                  */
 869                 if (addr->sa_family == AF_INET) {
 870                         SCTP_INP_RUNLOCK(inp);
 871                         SCTP_ASOC_CREATE_UNLOCK(inp);
 872                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 873                         return (EINVAL);
 874                 }
 875                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 876                         SCTP_INP_RUNLOCK(inp);
 877                         SCTP_ASOC_CREATE_UNLOCK(inp);
 878                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 879                         return (EINVAL);
 880                 }
 881         }
 882         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 883                 /* convert v4-mapped into v4 addr */
 884                 in6_sin6_2_sin(&store.sin, sin6);
 885                 addr = &store.sa;
 886         }
 887 #endif                          /* INET */
 888         /* Now do we connect? */
 889         if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
 890                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
 891                 if (stcb) {
 892                         SCTP_TCB_LOCK(stcb);
 893                 }
 894                 SCTP_INP_RUNLOCK(inp);
 895         } else {
 896                 SCTP_INP_RUNLOCK(inp);
 897                 SCTP_INP_WLOCK(inp);
 898                 SCTP_INP_INCR_REF(inp);
 899                 SCTP_INP_WUNLOCK(inp);
 900                 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL);
 901                 if (stcb == NULL) {
 902                         SCTP_INP_WLOCK(inp);
 903                         SCTP_INP_DECR_REF(inp);
 904                         SCTP_INP_WUNLOCK(inp);
 905                 }
 906         }
 907
 908         if (stcb != NULL) {
 909                 /* Already have or am bring up an association */
 910                 SCTP_ASOC_CREATE_UNLOCK(inp);
 911                 SCTP_TCB_UNLOCK(stcb);
 912                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY);
 913                 return (EALREADY);
 914         }
 915         /* We are GOOD to go */
 916         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
 917             inp->sctp_ep.pre_open_stream_count,
 918             inp->sctp_ep.port, p,
 919             SCTP_INITIALIZE_AUTH_PARAMS);
 920         SCTP_ASOC_CREATE_UNLOCK(inp);
 921         if (stcb == NULL) {
 922                 /* Gak! no memory */
 923                 return (error);
 924         }
 925         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
 926                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
 927                 /* Set the connected flag so we can queue data */
 928                 soisconnecting(so);
 929         }
 930         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
 931         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
 932         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
 933         SCTP_TCB_UNLOCK(stcb);
 934         return (error);
 935 }
 936
 937 static int
 938 sctp6_getaddr(struct socket *so, struct sockaddr **addr)
 939 {
 940         struct sockaddr_in6 *sin6;
 941         struct sctp_inpcb *inp;
 942         uint32_t vrf_id;
 943         struct sctp_ifa *sctp_ifa;
 944
 945         int error;
 946
 947         /*
 948          * Do the malloc first in case it blocks.
 949          */
 950         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof(*sin6));
 951         if (sin6 == NULL)
 952                 return (ENOMEM);
 953         sin6->sin6_family = AF_INET6;
 954         sin6->sin6_len = sizeof(*sin6);
 955
 956         inp = (struct sctp_inpcb *)so->so_pcb;
 957         if (inp == NULL) {
 958                 SCTP_FREE_SONAME(sin6);
 959                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 960                 return (ECONNRESET);
 961         }
 962         SCTP_INP_RLOCK(inp);
 963         sin6->sin6_port = inp->sctp_lport;
 964         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
 965                 /* For the bound all case you get back 0 */
 966                 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
 967                         struct sctp_tcb *stcb;
 968                         struct sockaddr_in6 *sin_a6;
 969                         struct sctp_nets *net;
 970                         int fnd;
 971
 972                         stcb = LIST_FIRST(&inp->sctp_asoc_list);
 973                         if (stcb == NULL) {
 974                                 SCTP_INP_RUNLOCK(inp);
 975                                 SCTP_FREE_SONAME(sin6);
 976                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 977                                 return (ENOENT);
 978                         }
 979                         fnd = 0;
 980                         sin_a6 = NULL;
 981                         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 982                                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 983                                 if (sin_a6 == NULL)
 984                                         /* this will make coverity happy */
 985                                         continue;
 986
 987                                 if (sin_a6->sin6_family == AF_INET6) {
 988                                         fnd = 1;
 989                                         break;
 990                                 }
 991                         }
 992                         if ((!fnd) || (sin_a6 == NULL)) {
 993                                 /* punt */
 994                                 SCTP_INP_RUNLOCK(inp);
 995                                 SCTP_FREE_SONAME(sin6);
 996                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 997                                 return (ENOENT);
 998                         }
 999                         vrf_id = inp->def_vrf_id;
1000                         sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *)&net->ro, net, 0, vrf_id);
1001                         if (sctp_ifa) {
1002                                 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr;
1003                         }
1004                 } else {
1005                         /* For the bound all case you get back 0 */
1006                         memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr));
1007                 }
1008         } else {
1009                 /* Take the first IPv6 address in the list */
1010                 struct sctp_laddr *laddr;
1011                 int fnd = 0;
1012
1013                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
1014                         if (laddr->ifa->address.sa.sa_family == AF_INET6) {
1015                                 struct sockaddr_in6 *sin_a;
1016
1017                                 sin_a = &laddr->ifa->address.sin6;
1018                                 sin6->sin6_addr = sin_a->sin6_addr;
1019                                 fnd = 1;
1020                                 break;
1021                         }
1022                 }
1023                 if (!fnd) {
1024                         SCTP_FREE_SONAME(sin6);
1025                         SCTP_INP_RUNLOCK(inp);
1026                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1027                         return (ENOENT);
1028                 }
1029         }
1030         SCTP_INP_RUNLOCK(inp);
1031         /* Scoping things for v6 */
1032         if ((error = sa6_recoverscope(sin6)) != 0) {
1033                 SCTP_FREE_SONAME(sin6);
1034                 return (error);
1035         }
1036         (*addr) = (struct sockaddr *)sin6;
1037         return (0);
1038 }
1039
1040 static int
1041 sctp6_peeraddr(struct socket *so, struct sockaddr **addr)
1042 {
1043         struct sockaddr_in6 *sin6;
1044         int fnd;
1045         struct sockaddr_in6 *sin_a6;
1046         struct sctp_inpcb *inp;
1047         struct sctp_tcb *stcb;
1048         struct sctp_nets *net;
1049         int error;
1050
1051         /* Do the malloc first in case it blocks. */
1052         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1053         if (sin6 == NULL)
1054                 return (ENOMEM);
1055         sin6->sin6_family = AF_INET6;
1056         sin6->sin6_len = sizeof(*sin6);
1057
1058         inp = (struct sctp_inpcb *)so->so_pcb;
1059         if ((inp == NULL) ||
1060             ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
1061                 /* UDP type and listeners will drop out here */
1062                 SCTP_FREE_SONAME(sin6);
1063                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN);
1064                 return (ENOTCONN);
1065         }
1066         SCTP_INP_RLOCK(inp);
1067         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1068         if (stcb) {
1069                 SCTP_TCB_LOCK(stcb);
1070         }
1071         SCTP_INP_RUNLOCK(inp);
1072         if (stcb == NULL) {
1073                 SCTP_FREE_SONAME(sin6);
1074                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1075                 return (ECONNRESET);
1076         }
1077         fnd = 0;
1078         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1079                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1080                 if (sin_a6->sin6_family == AF_INET6) {
1081                         fnd = 1;
1082                         sin6->sin6_port = stcb->rport;
1083                         sin6->sin6_addr = sin_a6->sin6_addr;
1084                         break;
1085                 }
1086         }
1087         SCTP_TCB_UNLOCK(stcb);
1088         if (!fnd) {
1089                 /* No IPv4 address */
1090                 SCTP_FREE_SONAME(sin6);
1091                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1092                 return (ENOENT);
1093         }
1094         if ((error = sa6_recoverscope(sin6)) != 0) {
1095                 SCTP_FREE_SONAME(sin6);
1096                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, error);
1097                 return (error);
1098         }
1099         *addr = (struct sockaddr *)sin6;
1100         return (0);
1101 }
1102
1103 static int
1104 sctp6_in6getaddr(struct socket *so, struct sockaddr **nam)
1105 {
1106         struct in6pcb *inp6 = sotoin6pcb(so);
1107         int error;
1108
1109         if (inp6 == NULL) {
1110                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1111                 return (EINVAL);
1112         }
1113
1114         /* allow v6 addresses precedence */
1115         error = sctp6_getaddr(so, nam);
1116 #ifdef INET
1117         if (error) {
1118                 struct sockaddr_in6 *sin6;
1119
1120                 /* try v4 next if v6 failed */
1121                 error = sctp_ingetaddr(so, nam);
1122                 if (error) {
1123                         return (error);
1124                 }
1125                 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1126                 if (sin6 == NULL) {
1127                         SCTP_FREE_SONAME(*nam);
1128                         return (ENOMEM);
1129                 }
1130                 in6_sin_2_v4mapsin6((struct sockaddr_in *)*nam, sin6);
1131                 SCTP_FREE_SONAME(*nam);
1132                 *nam = (struct sockaddr *)sin6;
1133         }
1134 #endif
1135         return (error);
1136 }
1137
1138
1139 static int
1140 sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
1141 {
1142         struct in6pcb *inp6 = sotoin6pcb(so);
1143         int error;
1144
1145         if (inp6 == NULL) {
1146                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1147                 return (EINVAL);
1148         }
1149
1150         /* allow v6 addresses precedence */
1151         error = sctp6_peeraddr(so, nam);
1152 #ifdef INET
1153         if (error) {
1154                 struct sockaddr_in6 *sin6;
1155
1156                 /* try v4 next if v6 failed */
1157                 error = sctp_peeraddr(so, nam);
1158                 if (error) {
1159                         return (error);
1160                 }
1161                 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1162                 if (sin6 == NULL) {
1163                         SCTP_FREE_SONAME(*nam);
1164                         return (ENOMEM);
1165                 }
1166                 in6_sin_2_v4mapsin6((struct sockaddr_in *)*nam, sin6);
1167                 SCTP_FREE_SONAME(*nam);
1168                 *nam = (struct sockaddr *)sin6;
1169         }
1170 #endif
1171         return (error);
1172 }
1173
1174 struct pr_usrreqs sctp6_usrreqs = {
1175         .pru_abort = sctp6_abort,
1176         .pru_accept = sctp_accept,
1177         .pru_attach = sctp6_attach,
1178         .pru_bind = sctp6_bind,
1179         .pru_connect = sctp6_connect,
1180         .pru_control = in6_control,
1181         .pru_close = sctp6_close,
1182         .pru_detach = sctp6_close,
1183         .pru_sopoll = sopoll_generic,
1184         .pru_flush = sctp_flush,
1185         .pru_disconnect = sctp6_disconnect,
1186         .pru_listen = sctp_listen,
1187         .pru_peeraddr = sctp6_getpeeraddr,
1188         .pru_send = sctp6_send,
1189         .pru_shutdown = sctp_shutdown,
1190         .pru_sockaddr = sctp6_in6getaddr,
1191         .pru_sosend = sctp_sosend,
1192         .pru_soreceive = sctp_soreceive
1193 };
1194
1195 #endif