sys/netinet6/sctp6_usrreq.c

   1 /*-
   2  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * a) Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  *
  12  * b) Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the distribution.
  15  *
  16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <netinet/sctp_os.h>
  37 #ifdef INET6
  38 #include <sys/proc.h>
  39 #include <netinet/sctp_pcb.h>
  40 #include <netinet/sctp_header.h>
  41 #include <netinet/sctp_var.h>
  42 #ifdef INET6
  43 #include <netinet6/sctp6_var.h>
  44 #endif
  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/udp.h>
  58
  59 #ifdef IPSEC
  60 #include <netipsec/ipsec.h>
  61 #ifdef INET6
  62 #include <netipsec/ipsec6.h>
  63 #endif                          /* INET6 */
  64 #endif                          /* IPSEC */
  65
  66 extern struct protosw inetsw[];
  67
  68 int
  69 sctp6_input(struct mbuf **i_pak, int *offp, int proto)
  70 {
  71         struct mbuf *m;
  72         int iphlen;
  73         uint32_t vrf_id;
  74         uint8_t ecn_bits;
  75         struct sockaddr_in6 src, dst;
  76         struct ip6_hdr *ip6;
  77         struct sctphdr *sh;
  78         struct sctp_chunkhdr *ch;
  79         int length, offset;
  80
  81 #if !defined(SCTP_WITH_NO_CSUM)
  82         uint8_t compute_crc;
  83
  84 #endif
  85         uint32_t mflowid;
  86         uint8_t use_mflowid;
  87         uint16_t port = 0;
  88
  89         iphlen = *offp;
  90         if (SCTP_GET_PKT_VRFID(*i_pak, vrf_id)) {
  91                 SCTP_RELEASE_PKT(*i_pak);
  92                 return (IPPROTO_DONE);
  93         }
  94         m = SCTP_HEADER_TO_CHAIN(*i_pak);
  95 #ifdef SCTP_MBUF_LOGGING
  96         /* Log in any input mbufs */
  97         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
  98                 struct mbuf *mat;
  99
 100                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
 101                         if (SCTP_BUF_IS_EXTENDED(mat)) {
 102                                 sctp_log_mb(mat, SCTP_MBUF_INPUT);
 103                         }
 104                 }
 105         }
 106 #endif
 107 #ifdef SCTP_PACKET_LOGGING
 108         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
 109                 sctp_packet_log(m);
 110         }
 111 #endif
 112         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
 113             "sctp6_input(): Packet of length %d received on %s with csum_flags 0x%x.\n",
 114             m->m_pkthdr.len,
 115             if_name(m->m_pkthdr.rcvif),
 116             m->m_pkthdr.csum_flags);
 117         if (m->m_flags & M_FLOWID) {
 118                 mflowid = m->m_pkthdr.flowid;
 119                 use_mflowid = 1;
 120         } else {
 121                 mflowid = 0;
 122                 use_mflowid = 0;
 123         }
 124         SCTP_STAT_INCR(sctps_recvpackets);
 125         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
 126         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
 127         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
 128         ip6 = mtod(m, struct ip6_hdr *);
 129         IP6_EXTHDR_GET(sh, struct sctphdr *, m, iphlen,
 130             (int)(sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr)));
 131         if (sh == NULL) {
 132                 SCTP_STAT_INCR(sctps_hdrops);
 133                 return (IPPROTO_DONE);
 134         }
 135         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
 136         offset -= sizeof(struct sctp_chunkhdr);
 137         memset(&src, 0, sizeof(struct sockaddr_in6));
 138         src.sin6_family = AF_INET6;
 139         src.sin6_len = sizeof(struct sockaddr_in6);
 140         src.sin6_port = sh->src_port;
 141         src.sin6_addr = ip6->ip6_src;
 142         if (in6_setscope(&src.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
 143                 goto out;
 144         }
 145         memset(&dst, 0, sizeof(struct sockaddr_in6));
 146         dst.sin6_family = AF_INET6;
 147         dst.sin6_len = sizeof(struct sockaddr_in6);
 148         dst.sin6_port = sh->dest_port;
 149         dst.sin6_addr = ip6->ip6_dst;
 150         if (in6_setscope(&dst.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
 151                 goto out;
 152         }
 153         if (faithprefix_p != NULL && (*faithprefix_p) (&dst.sin6_addr)) {
 154                 /* XXX send icmp6 host/port unreach? */
 155                 goto out;
 156         }
 157         length = ntohs(ip6->ip6_plen) + iphlen;
 158         /* Validate mbuf chain length with IP payload length. */
 159         if (SCTP_HEADER_LEN(m) != length) {
 160                 SCTPDBG(SCTP_DEBUG_INPUT1,
 161                     "sctp6_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
 162                 SCTP_STAT_INCR(sctps_hdrops);
 163                 goto out;
 164         }
 165         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 166                 goto out;
 167         }
 168         ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff);
 169 #if defined(SCTP_WITH_NO_CSUM)
 170         SCTP_STAT_INCR(sctps_recvnocrc);
 171 #else
 172         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
 173                 SCTP_STAT_INCR(sctps_recvhwcrc);
 174                 compute_crc = 0;
 175         } else {
 176                 SCTP_STAT_INCR(sctps_recvswcrc);
 177                 compute_crc = 1;
 178         }
 179 #endif
 180         sctp_common_input_processing(&m, iphlen, offset, length,
 181             (struct sockaddr *)&src,
 182             (struct sockaddr *)&dst,
 183             sh, ch,
 184 #if !defined(SCTP_WITH_NO_CSUM)
 185             compute_crc,
 186 #endif
 187             ecn_bits,
 188             use_mflowid, mflowid,
 189             vrf_id, port);
 190 out:
 191         if (m) {
 192                 sctp_m_freem(m);
 193         }
 194         return (IPPROTO_DONE);
 195 }
 196
 197
 198 static void
 199 sctp6_notify_mbuf(struct sctp_inpcb *inp, struct icmp6_hdr *icmp6,
 200     struct sctphdr *sh, struct sctp_tcb *stcb, struct sctp_nets *net)
 201 {
 202         uint32_t nxtsz;
 203
 204         if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
 205             (icmp6 == NULL) || (sh == NULL)) {
 206                 goto out;
 207         }
 208         /* First do we even look at it? */
 209         if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag))
 210                 goto out;
 211
 212         if (icmp6->icmp6_type != ICMP6_PACKET_TOO_BIG) {
 213                 /* not PACKET TO BIG */
 214                 goto out;
 215         }
 216         /*
 217          * ok we need to look closely. We could even get smarter and look at
 218          * anyone that we sent to in case we get a different ICMP that tells
 219          * us there is no way to reach a host, but for this impl, all we
 220          * care about is MTU discovery.
 221          */
 222         nxtsz = ntohl(icmp6->icmp6_mtu);
 223         /* Stop any PMTU timer */
 224         sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL, SCTP_FROM_SCTP6_USRREQ + SCTP_LOC_1);
 225
 226         /* Adjust destination size limit */
 227         if (net->mtu > nxtsz) {
 228                 net->mtu = nxtsz;
 229                 if (net->port) {
 230                         net->mtu -= sizeof(struct udphdr);
 231                 }
 232         }
 233         /* now what about the ep? */
 234         if (stcb->asoc.smallest_mtu > nxtsz) {
 235                 struct sctp_tmit_chunk *chk;
 236
 237                 /* Adjust that too */
 238                 stcb->asoc.smallest_mtu = nxtsz;
 239                 /* now off to subtract IP_DF flag if needed */
 240
 241                 TAILQ_FOREACH(chk, &stcb->asoc.send_queue, sctp_next) {
 242                         if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
 243                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 244                         }
 245                 }
 246                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
 247                         if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
 248                                 /*
 249                                  * For this guy we also mark for immediate
 250                                  * resend since we sent to big of chunk
 251                                  */
 252                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 253                                 if (chk->sent != SCTP_DATAGRAM_RESEND)
 254                                         stcb->asoc.sent_queue_retran_cnt++;
 255                                 chk->sent = SCTP_DATAGRAM_RESEND;
 256                                 chk->rec.data.doing_fast_retransmit = 0;
 257
 258                                 chk->sent = SCTP_DATAGRAM_RESEND;
 259                                 /* Clear any time so NO RTT is being done */
 260                                 chk->sent_rcv_time.tv_sec = 0;
 261                                 chk->sent_rcv_time.tv_usec = 0;
 262                                 stcb->asoc.total_flight -= chk->send_size;
 263                                 net->flight_size -= chk->send_size;
 264                         }
 265                 }
 266         }
 267         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL);
 268 out:
 269         if (stcb) {
 270                 SCTP_TCB_UNLOCK(stcb);
 271         }
 272 }
 273
 274
 275 void
 276 sctp6_notify(struct sctp_inpcb *inp,
 277     struct icmp6_hdr *icmph,
 278     struct sctphdr *sh,
 279     struct sockaddr *to,
 280     struct sctp_tcb *stcb,
 281     struct sctp_nets *net)
 282 {
 283 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 284         struct socket *so;
 285
 286 #endif
 287
 288         /* protection */
 289         if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
 290             (sh == NULL) || (to == NULL)) {
 291                 if (stcb)
 292                         SCTP_TCB_UNLOCK(stcb);
 293                 return;
 294         }
 295         /* First job is to verify the vtag matches what I would send */
 296         if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag)) {
 297                 SCTP_TCB_UNLOCK(stcb);
 298                 return;
 299         }
 300         if (icmph->icmp6_type != ICMP_UNREACH) {
 301                 /* We only care about unreachable */
 302                 SCTP_TCB_UNLOCK(stcb);
 303                 return;
 304         }
 305         if ((icmph->icmp6_code == ICMP_UNREACH_NET) ||
 306             (icmph->icmp6_code == ICMP_UNREACH_HOST) ||
 307             (icmph->icmp6_code == ICMP_UNREACH_NET_UNKNOWN) ||
 308             (icmph->icmp6_code == ICMP_UNREACH_HOST_UNKNOWN) ||
 309             (icmph->icmp6_code == ICMP_UNREACH_ISOLATED) ||
 310             (icmph->icmp6_code == ICMP_UNREACH_NET_PROHIB) ||
 311             (icmph->icmp6_code == ICMP_UNREACH_HOST_PROHIB) ||
 312             (icmph->icmp6_code == ICMP_UNREACH_FILTER_PROHIB)) {
 313
 314                 /*
 315                  * Hmm reachablity problems we must examine closely. If its
 316                  * not reachable, we may have lost a network. Or if there is
 317                  * NO protocol at the other end named SCTP. well we consider
 318                  * it a OOTB abort.
 319                  */
 320                 if (net->dest_state & SCTP_ADDR_REACHABLE) {
 321                         /* Ok that destination is NOT reachable */
 322                         net->dest_state &= ~SCTP_ADDR_REACHABLE;
 323                         net->dest_state &= ~SCTP_ADDR_PF;
 324                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
 325                             stcb, 0, (void *)net, SCTP_SO_NOT_LOCKED);
 326                 }
 327                 SCTP_TCB_UNLOCK(stcb);
 328         } else if ((icmph->icmp6_code == ICMP_UNREACH_PROTOCOL) ||
 329             (icmph->icmp6_code == ICMP_UNREACH_PORT)) {
 330                 /*
 331                  * Here the peer is either playing tricks on us, including
 332                  * an address that belongs to someone who does not support
 333                  * SCTP OR was a userland implementation that shutdown and
 334                  * now is dead. In either case treat it like a OOTB abort
 335                  * with no TCB
 336                  */
 337                 sctp_abort_notification(stcb, 1, 0, NULL, SCTP_SO_NOT_LOCKED);
 338 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 339                 so = SCTP_INP_SO(inp);
 340                 atomic_add_int(&stcb->asoc.refcnt, 1);
 341                 SCTP_TCB_UNLOCK(stcb);
 342                 SCTP_SOCKET_LOCK(so, 1);
 343                 SCTP_TCB_LOCK(stcb);
 344                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 345 #endif
 346                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2);
 347 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 348                 SCTP_SOCKET_UNLOCK(so, 1);
 349                 /* SCTP_TCB_UNLOCK(stcb); MT: I think this is not needed. */
 350 #endif
 351                 /* no need to unlock here, since the TCB is gone */
 352         } else {
 353                 SCTP_TCB_UNLOCK(stcb);
 354         }
 355 }
 356
 357
 358
 359 void
 360 sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d)
 361 {
 362         struct sctphdr sh;
 363         struct ip6ctlparam *ip6cp = NULL;
 364         uint32_t vrf_id;
 365
 366         vrf_id = SCTP_DEFAULT_VRFID;
 367
 368         if (pktdst->sa_family != AF_INET6 ||
 369             pktdst->sa_len != sizeof(struct sockaddr_in6))
 370                 return;
 371
 372         if ((unsigned)cmd >= PRC_NCMDS)
 373                 return;
 374         if (PRC_IS_REDIRECT(cmd)) {
 375                 d = NULL;
 376         } else if (inet6ctlerrmap[cmd] == 0) {
 377                 return;
 378         }
 379         /* if the parameter is from icmp6, decode it. */
 380         if (d != NULL) {
 381                 ip6cp = (struct ip6ctlparam *)d;
 382         } else {
 383                 ip6cp = (struct ip6ctlparam *)NULL;
 384         }
 385
 386         if (ip6cp) {
 387                 /*
 388                  * XXX: We assume that when IPV6 is non NULL, M and OFF are
 389                  * valid.
 390                  */
 391                 /* check if we can safely examine src and dst ports */
 392                 struct sctp_inpcb *inp = NULL;
 393                 struct sctp_tcb *stcb = NULL;
 394                 struct sctp_nets *net = NULL;
 395                 struct sockaddr_in6 final;
 396
 397                 if (ip6cp->ip6c_m == NULL)
 398                         return;
 399
 400                 bzero(&sh, sizeof(sh));
 401                 bzero(&final, sizeof(final));
 402                 inp = NULL;
 403                 net = NULL;
 404                 m_copydata(ip6cp->ip6c_m, ip6cp->ip6c_off, sizeof(sh),
 405                     (caddr_t)&sh);
 406                 ip6cp->ip6c_src->sin6_port = sh.src_port;
 407                 final.sin6_len = sizeof(final);
 408                 final.sin6_family = AF_INET6;
 409                 final.sin6_addr = ((struct sockaddr_in6 *)pktdst)->sin6_addr;
 410                 final.sin6_port = sh.dest_port;
 411                 stcb = sctp_findassociation_addr_sa((struct sockaddr *)&final,
 412                     (struct sockaddr *)ip6cp->ip6c_src,
 413                     &inp, &net, 1, vrf_id);
 414                 /* inp's ref-count increased && stcb locked */
 415                 if (stcb != NULL && inp && (inp->sctp_socket != NULL)) {
 416                         if (cmd == PRC_MSGSIZE) {
 417                                 sctp6_notify_mbuf(inp,
 418                                     ip6cp->ip6c_icmp6,
 419                                     &sh,
 420                                     stcb,
 421                                     net);
 422                                 /* inp's ref-count reduced && stcb unlocked */
 423                         } else {
 424                                 sctp6_notify(inp, ip6cp->ip6c_icmp6, &sh,
 425                                     (struct sockaddr *)&final,
 426                                     stcb, net);
 427                                 /* inp's ref-count reduced && stcb unlocked */
 428                         }
 429                 } else {
 430                         if (PRC_IS_REDIRECT(cmd) && inp) {
 431                                 in6_rtchange((struct in6pcb *)inp,
 432                                     inet6ctlerrmap[cmd]);
 433                         }
 434                         if (inp) {
 435                                 /* reduce inp's ref-count */
 436                                 SCTP_INP_WLOCK(inp);
 437                                 SCTP_INP_DECR_REF(inp);
 438                                 SCTP_INP_WUNLOCK(inp);
 439                         }
 440                         if (stcb)
 441                                 SCTP_TCB_UNLOCK(stcb);
 442                 }
 443         }
 444 }
 445
 446 /*
 447  * this routine can probably be collasped into the one in sctp_userreq.c
 448  * since they do the same thing and now we lookup with a sockaddr
 449  */
 450 static int
 451 sctp6_getcred(SYSCTL_HANDLER_ARGS)
 452 {
 453         struct xucred xuc;
 454         struct sockaddr_in6 addrs[2];
 455         struct sctp_inpcb *inp;
 456         struct sctp_nets *net;
 457         struct sctp_tcb *stcb;
 458         int error;
 459         uint32_t vrf_id;
 460
 461         vrf_id = SCTP_DEFAULT_VRFID;
 462
 463         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 464         if (error)
 465                 return (error);
 466
 467         if (req->newlen != sizeof(addrs)) {
 468                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 469                 return (EINVAL);
 470         }
 471         if (req->oldlen != sizeof(struct ucred)) {
 472                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 473                 return (EINVAL);
 474         }
 475         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 476         if (error)
 477                 return (error);
 478
 479         stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[1]),
 480             sin6tosa(&addrs[0]),
 481             &inp, &net, 1, vrf_id);
 482         if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) {
 483                 if ((inp != NULL) && (stcb == NULL)) {
 484                         /* reduce ref-count */
 485                         SCTP_INP_WLOCK(inp);
 486                         SCTP_INP_DECR_REF(inp);
 487                         goto cred_can_cont;
 488                 }
 489                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 490                 error = ENOENT;
 491                 goto out;
 492         }
 493         SCTP_TCB_UNLOCK(stcb);
 494         /*
 495          * We use the write lock here, only since in the error leg we need
 496          * it. If we used RLOCK, then we would have to
 497          * wlock/decr/unlock/rlock. Which in theory could create a hole.
 498          * Better to use higher wlock.
 499          */
 500         SCTP_INP_WLOCK(inp);
 501 cred_can_cont:
 502         error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket);
 503         if (error) {
 504                 SCTP_INP_WUNLOCK(inp);
 505                 goto out;
 506         }
 507         cru2x(inp->sctp_socket->so_cred, &xuc);
 508         SCTP_INP_WUNLOCK(inp);
 509         error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 510 out:
 511         return (error);
 512 }
 513
 514 SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW,
 515     0, 0,
 516     sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection");
 517
 518
 519 /* This is the same as the sctp_abort() could be made common */
 520 static void
 521 sctp6_abort(struct socket *so)
 522 {
 523         struct sctp_inpcb *inp;
 524         uint32_t flags;
 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;
 530         }
 531 sctp_must_try_again:
 532         flags = inp->sctp_flags;
 533 #ifdef SCTP_LOG_CLOSING
 534         sctp_log_closing(inp, NULL, 17);
 535 #endif
 536         if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) &&
 537             (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) {
 538 #ifdef SCTP_LOG_CLOSING
 539                 sctp_log_closing(inp, NULL, 16);
 540 #endif
 541                 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT,
 542                     SCTP_CALLED_AFTER_CMPSET_OFCLOSE);
 543                 SOCK_LOCK(so);
 544                 SCTP_SB_CLEAR(so->so_snd);
 545                 /*
 546                  * same for the rcv ones, they are only here for the
 547                  * accounting/select.
 548                  */
 549                 SCTP_SB_CLEAR(so->so_rcv);
 550                 /* Now null out the reference, we are completely detached. */
 551                 so->so_pcb = NULL;
 552                 SOCK_UNLOCK(so);
 553         } else {
 554                 flags = inp->sctp_flags;
 555                 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) {
 556                         goto sctp_must_try_again;
 557                 }
 558         }
 559         return;
 560 }
 561
 562 static int
 563 sctp6_attach(struct socket *so, int proto SCTP_UNUSED, struct thread *p SCTP_UNUSED)
 564 {
 565         struct in6pcb *inp6;
 566         int error;
 567         struct sctp_inpcb *inp;
 568         uint32_t vrf_id = SCTP_DEFAULT_VRFID;
 569
 570         inp = (struct sctp_inpcb *)so->so_pcb;
 571         if (inp != NULL) {
 572                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 573                 return (EINVAL);
 574         }
 575         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 576                 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace));
 577                 if (error)
 578                         return (error);
 579         }
 580         error = sctp_inpcb_alloc(so, vrf_id);
 581         if (error)
 582                 return (error);
 583         inp = (struct sctp_inpcb *)so->so_pcb;
 584         SCTP_INP_WLOCK(inp);
 585         inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6;     /* I'm v6! */
 586         inp6 = (struct in6pcb *)inp;
 587
 588         inp6->inp_vflag |= INP_IPV6;
 589         inp6->in6p_hops = -1;   /* use kernel default */
 590         inp6->in6p_cksum = -1;  /* just to be sure */
 591 #ifdef INET
 592         /*
 593          * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6
 594          * socket as well, because the socket may be bound to an IPv6
 595          * wildcard address, which may match an IPv4-mapped IPv6 address.
 596          */
 597         inp6->inp_ip_ttl = MODULE_GLOBAL(ip_defttl);
 598 #endif
 599         /*
 600          * Hmm what about the IPSEC stuff that is missing here but in
 601          * sctp_attach()?
 602          */
 603         SCTP_INP_WUNLOCK(inp);
 604         return (0);
 605 }
 606
 607 static int
 608 sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p)
 609 {
 610         struct sctp_inpcb *inp;
 611         struct in6pcb *inp6;
 612         int error;
 613
 614         inp = (struct sctp_inpcb *)so->so_pcb;
 615         if (inp == NULL) {
 616                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 617                 return (EINVAL);
 618         }
 619         if (addr) {
 620                 switch (addr->sa_family) {
 621 #ifdef INET
 622                 case AF_INET:
 623                         if (addr->sa_len != sizeof(struct sockaddr_in)) {
 624                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 625                                 return (EINVAL);
 626                         }
 627                         break;
 628 #endif
 629 #ifdef INET6
 630                 case AF_INET6:
 631                         if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 632                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 633                                 return (EINVAL);
 634                         }
 635                         break;
 636 #endif
 637                 default:
 638                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 639                         return (EINVAL);
 640                 }
 641         }
 642         inp6 = (struct in6pcb *)inp;
 643         inp6->inp_vflag &= ~INP_IPV4;
 644         inp6->inp_vflag |= INP_IPV6;
 645         if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp6) == 0)) {
 646                 switch (addr->sa_family) {
 647 #ifdef INET
 648                 case AF_INET:
 649                         /* binding v4 addr to v6 socket, so reset flags */
 650                         inp6->inp_vflag |= INP_IPV4;
 651                         inp6->inp_vflag &= ~INP_IPV6;
 652                         break;
 653 #endif
 654 #ifdef INET6
 655                 case AF_INET6:
 656                         {
 657                                 struct sockaddr_in6 *sin6_p;
 658
 659                                 sin6_p = (struct sockaddr_in6 *)addr;
 660
 661                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
 662                                         inp6->inp_vflag |= INP_IPV4;
 663                                 }
 664 #ifdef INET
 665                                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 666                                         struct sockaddr_in sin;
 667
 668                                         in6_sin6_2_sin(&sin, sin6_p);
 669                                         inp6->inp_vflag |= INP_IPV4;
 670                                         inp6->inp_vflag &= ~INP_IPV6;
 671                                         error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p);
 672                                         return (error);
 673                                 }
 674 #endif
 675                                 break;
 676                         }
 677 #endif
 678                 default:
 679                         break;
 680                 }
 681         } else if (addr != NULL) {
 682                 struct sockaddr_in6 *sin6_p;
 683
 684                 /* IPV6_V6ONLY socket */
 685 #ifdef INET
 686                 if (addr->sa_family == AF_INET) {
 687                         /* can't bind v4 addr to v6 only socket! */
 688                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 689                         return (EINVAL);
 690                 }
 691 #endif
 692                 sin6_p = (struct sockaddr_in6 *)addr;
 693
 694                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 695                         /* can't bind v4-mapped addrs either! */
 696                         /* NOTE: we don't support SIIT */
 697                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 698                         return (EINVAL);
 699                 }
 700         }
 701         error = sctp_inpcb_bind(so, addr, NULL, p);
 702         return (error);
 703 }
 704
 705
 706 static void
 707 sctp6_close(struct socket *so)
 708 {
 709         sctp_close(so);
 710 }
 711
 712 /* This could be made common with sctp_detach() since they are identical */
 713
 714 static
 715 int
 716 sctp6_disconnect(struct socket *so)
 717 {
 718         return (sctp_disconnect(so));
 719 }
 720
 721
 722 int
 723 sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 724     struct mbuf *control, struct thread *p);
 725
 726
 727 static int
 728 sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 729     struct mbuf *control, struct thread *p)
 730 {
 731         struct sctp_inpcb *inp;
 732         struct in6pcb *inp6;
 733
 734 #ifdef INET
 735         struct sockaddr_in6 *sin6;
 736
 737 #endif                          /* INET */
 738         /* No SPL needed since sctp_output does this */
 739
 740         inp = (struct sctp_inpcb *)so->so_pcb;
 741         if (inp == NULL) {
 742                 if (control) {
 743                         SCTP_RELEASE_PKT(control);
 744                         control = NULL;
 745                 }
 746                 SCTP_RELEASE_PKT(m);
 747                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 748                 return (EINVAL);
 749         }
 750         inp6 = (struct in6pcb *)inp;
 751         /*
 752          * For the TCP model we may get a NULL addr, if we are a connected
 753          * socket thats ok.
 754          */
 755         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) &&
 756             (addr == NULL)) {
 757                 goto connected_type;
 758         }
 759         if (addr == NULL) {
 760                 SCTP_RELEASE_PKT(m);
 761                 if (control) {
 762                         SCTP_RELEASE_PKT(control);
 763                         control = NULL;
 764                 }
 765                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ);
 766                 return (EDESTADDRREQ);
 767         }
 768 #ifdef INET
 769         sin6 = (struct sockaddr_in6 *)addr;
 770         if (SCTP_IPV6_V6ONLY(inp6)) {
 771                 /*
 772                  * if IPV6_V6ONLY flag, we discard datagrams destined to a
 773                  * v4 addr or v4-mapped addr
 774                  */
 775                 if (addr->sa_family == AF_INET) {
 776                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 777                         return (EINVAL);
 778                 }
 779                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 780                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 781                         return (EINVAL);
 782                 }
 783         }
 784         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 785                 if (!MODULE_GLOBAL(ip6_v6only)) {
 786                         struct sockaddr_in sin;
 787
 788                         /* convert v4-mapped into v4 addr and send */
 789                         in6_sin6_2_sin(&sin, sin6);
 790                         return (sctp_sendm(so, flags, m, (struct sockaddr *)&sin,
 791                             control, p));
 792                 } else {
 793                         /* mapped addresses aren't enabled */
 794                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 795                         return (EINVAL);
 796                 }
 797         }
 798 #endif                          /* INET */
 799 connected_type:
 800         /* now what about control */
 801         if (control) {
 802                 if (inp->control) {
 803                         SCTP_PRINTF("huh? control set?\n");
 804                         SCTP_RELEASE_PKT(inp->control);
 805                         inp->control = NULL;
 806                 }
 807                 inp->control = control;
 808         }
 809         /* Place the data */
 810         if (inp->pkt) {
 811                 SCTP_BUF_NEXT(inp->pkt_last) = m;
 812                 inp->pkt_last = m;
 813         } else {
 814                 inp->pkt_last = inp->pkt = m;
 815         }
 816         if (
 817         /* FreeBSD and MacOSX uses a flag passed */
 818             ((flags & PRUS_MORETOCOME) == 0)
 819             ) {
 820                 /*
 821                  * note with the current version this code will only be used
 822                  * by OpenBSD, NetBSD and FreeBSD have methods for
 823                  * re-defining sosend() to use sctp_sosend().  One can
 824                  * optionaly switch back to this code (by changing back the
 825                  * defininitions but this is not advisable.
 826                  */
 827                 int ret;
 828
 829                 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
 830                 inp->pkt = NULL;
 831                 inp->control = NULL;
 832                 return (ret);
 833         } else {
 834                 return (0);
 835         }
 836 }
 837
 838 static int
 839 sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
 840 {
 841         uint32_t vrf_id;
 842         int error = 0;
 843         struct sctp_inpcb *inp;
 844         struct in6pcb *inp6;
 845         struct sctp_tcb *stcb;
 846
 847 #ifdef INET
 848         struct sockaddr_in6 *sin6;
 849         struct sockaddr_storage ss;
 850
 851 #endif
 852
 853         inp6 = (struct in6pcb *)so->so_pcb;
 854         inp = (struct sctp_inpcb *)so->so_pcb;
 855         if (inp == NULL) {
 856                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 857                 return (ECONNRESET);    /* I made the same as TCP since we are
 858                                          * not setup? */
 859         }
 860         if (addr == NULL) {
 861                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 862                 return (EINVAL);
 863         }
 864         switch (addr->sa_family) {
 865 #ifdef INET
 866         case AF_INET:
 867                 if (addr->sa_len != sizeof(struct sockaddr_in)) {
 868                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 869                         return (EINVAL);
 870                 }
 871                 break;
 872 #endif
 873 #ifdef INET6
 874         case AF_INET6:
 875                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 876                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 877                         return (EINVAL);
 878                 }
 879                 break;
 880 #endif
 881         default:
 882                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 883                 return (EINVAL);
 884         }
 885
 886         vrf_id = inp->def_vrf_id;
 887         SCTP_ASOC_CREATE_LOCK(inp);
 888         SCTP_INP_RLOCK(inp);
 889         if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) ==
 890             SCTP_PCB_FLAGS_UNBOUND) {
 891                 /* Bind a ephemeral port */
 892                 SCTP_INP_RUNLOCK(inp);
 893                 error = sctp6_bind(so, NULL, p);
 894                 if (error) {
 895                         SCTP_ASOC_CREATE_UNLOCK(inp);
 896
 897                         return (error);
 898                 }
 899                 SCTP_INP_RLOCK(inp);
 900         }
 901         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
 902             (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) {
 903                 /* We are already connected AND the TCP model */
 904                 SCTP_INP_RUNLOCK(inp);
 905                 SCTP_ASOC_CREATE_UNLOCK(inp);
 906                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE);
 907                 return (EADDRINUSE);
 908         }
 909 #ifdef INET
 910         sin6 = (struct sockaddr_in6 *)addr;
 911         if (SCTP_IPV6_V6ONLY(inp6)) {
 912                 /*
 913                  * if IPV6_V6ONLY flag, ignore connections destined to a v4
 914                  * addr or v4-mapped addr
 915                  */
 916                 if (addr->sa_family == AF_INET) {
 917                         SCTP_INP_RUNLOCK(inp);
 918                         SCTP_ASOC_CREATE_UNLOCK(inp);
 919                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 920                         return (EINVAL);
 921                 }
 922                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 923                         SCTP_INP_RUNLOCK(inp);
 924                         SCTP_ASOC_CREATE_UNLOCK(inp);
 925                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 926                         return (EINVAL);
 927                 }
 928         }
 929         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 930                 if (!MODULE_GLOBAL(ip6_v6only)) {
 931                         /* convert v4-mapped into v4 addr */
 932                         in6_sin6_2_sin((struct sockaddr_in *)&ss, sin6);
 933                         addr = (struct sockaddr *)&ss;
 934                 } else {
 935                         /* mapped addresses aren't enabled */
 936                         SCTP_INP_RUNLOCK(inp);
 937                         SCTP_ASOC_CREATE_UNLOCK(inp);
 938                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 939                         return (EINVAL);
 940                 }
 941         }
 942 #endif                          /* INET */
 943         /* Now do we connect? */
 944         if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
 945                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
 946                 if (stcb) {
 947                         SCTP_TCB_UNLOCK(stcb);
 948                 }
 949                 SCTP_INP_RUNLOCK(inp);
 950         } else {
 951                 SCTP_INP_RUNLOCK(inp);
 952                 SCTP_INP_WLOCK(inp);
 953                 SCTP_INP_INCR_REF(inp);
 954                 SCTP_INP_WUNLOCK(inp);
 955                 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL);
 956                 if (stcb == NULL) {
 957                         SCTP_INP_WLOCK(inp);
 958                         SCTP_INP_DECR_REF(inp);
 959                         SCTP_INP_WUNLOCK(inp);
 960                 }
 961         }
 962
 963         if (stcb != NULL) {
 964                 /* Already have or am bring up an association */
 965                 SCTP_ASOC_CREATE_UNLOCK(inp);
 966                 SCTP_TCB_UNLOCK(stcb);
 967                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY);
 968                 return (EALREADY);
 969         }
 970         /* We are GOOD to go */
 971         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id, p);
 972         SCTP_ASOC_CREATE_UNLOCK(inp);
 973         if (stcb == NULL) {
 974                 /* Gak! no memory */
 975                 return (error);
 976         }
 977         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
 978                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
 979                 /* Set the connected flag so we can queue data */
 980                 soisconnecting(so);
 981         }
 982         stcb->asoc.state = SCTP_STATE_COOKIE_WAIT;
 983         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
 984
 985         /* initialize authentication parameters for the assoc */
 986         sctp_initialize_auth_params(inp, stcb);
 987
 988         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
 989         SCTP_TCB_UNLOCK(stcb);
 990         return (error);
 991 }
 992
 993 static int
 994 sctp6_getaddr(struct socket *so, struct sockaddr **addr)
 995 {
 996         struct sockaddr_in6 *sin6;
 997         struct sctp_inpcb *inp;
 998         uint32_t vrf_id;
 999         struct sctp_ifa *sctp_ifa;
1000
1001         int error;
1002
1003         /*
1004          * Do the malloc first in case it blocks.
1005          */
1006         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof(*sin6));
1007         if (sin6 == NULL)
1008                 return (ENOMEM);
1009         sin6->sin6_family = AF_INET6;
1010         sin6->sin6_len = sizeof(*sin6);
1011
1012         inp = (struct sctp_inpcb *)so->so_pcb;
1013         if (inp == NULL) {
1014                 SCTP_FREE_SONAME(sin6);
1015                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1016                 return (ECONNRESET);
1017         }
1018         SCTP_INP_RLOCK(inp);
1019         sin6->sin6_port = inp->sctp_lport;
1020         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
1021                 /* For the bound all case you get back 0 */
1022                 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
1023                         struct sctp_tcb *stcb;
1024                         struct sockaddr_in6 *sin_a6;
1025                         struct sctp_nets *net;
1026                         int fnd;
1027
1028                         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1029                         if (stcb == NULL) {
1030                                 goto notConn6;
1031                         }
1032                         fnd = 0;
1033                         sin_a6 = NULL;
1034                         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1035                                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1036                                 if (sin_a6 == NULL)
1037                                         /* this will make coverity happy */
1038                                         continue;
1039
1040                                 if (sin_a6->sin6_family == AF_INET6) {
1041                                         fnd = 1;
1042                                         break;
1043                                 }
1044                         }
1045                         if ((!fnd) || (sin_a6 == NULL)) {
1046                                 /* punt */
1047                                 goto notConn6;
1048                         }
1049                         vrf_id = inp->def_vrf_id;
1050                         sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *) & net->ro, net, 0, vrf_id);
1051                         if (sctp_ifa) {
1052                                 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr;
1053                         }
1054                 } else {
1055                         /* For the bound all case you get back 0 */
1056         notConn6:
1057                         memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr));
1058                 }
1059         } else {
1060                 /* Take the first IPv6 address in the list */
1061                 struct sctp_laddr *laddr;
1062                 int fnd = 0;
1063
1064                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
1065                         if (laddr->ifa->address.sa.sa_family == AF_INET6) {
1066                                 struct sockaddr_in6 *sin_a;
1067
1068                                 sin_a = (struct sockaddr_in6 *)&laddr->ifa->address.sin6;
1069                                 sin6->sin6_addr = sin_a->sin6_addr;
1070                                 fnd = 1;
1071                                 break;
1072                         }
1073                 }
1074                 if (!fnd) {
1075                         SCTP_FREE_SONAME(sin6);
1076                         SCTP_INP_RUNLOCK(inp);
1077                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1078                         return (ENOENT);
1079                 }
1080         }
1081         SCTP_INP_RUNLOCK(inp);
1082         /* Scoping things for v6 */
1083         if ((error = sa6_recoverscope(sin6)) != 0) {
1084                 SCTP_FREE_SONAME(sin6);
1085                 return (error);
1086         }
1087         (*addr) = (struct sockaddr *)sin6;
1088         return (0);
1089 }
1090
1091 static int
1092 sctp6_peeraddr(struct socket *so, struct sockaddr **addr)
1093 {
1094         struct sockaddr_in6 *sin6;
1095         int fnd;
1096         struct sockaddr_in6 *sin_a6;
1097         struct sctp_inpcb *inp;
1098         struct sctp_tcb *stcb;
1099         struct sctp_nets *net;
1100         int error;
1101
1102         /* Do the malloc first in case it blocks. */
1103         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1104         if (sin6 == NULL)
1105                 return (ENOMEM);
1106         sin6->sin6_family = AF_INET6;
1107         sin6->sin6_len = sizeof(*sin6);
1108
1109         inp = (struct sctp_inpcb *)so->so_pcb;
1110         if ((inp == NULL) ||
1111             ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
1112                 /* UDP type and listeners will drop out here */
1113                 SCTP_FREE_SONAME(sin6);
1114                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN);
1115                 return (ENOTCONN);
1116         }
1117         SCTP_INP_RLOCK(inp);
1118         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1119         if (stcb) {
1120                 SCTP_TCB_LOCK(stcb);
1121         }
1122         SCTP_INP_RUNLOCK(inp);
1123         if (stcb == NULL) {
1124                 SCTP_FREE_SONAME(sin6);
1125                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1126                 return (ECONNRESET);
1127         }
1128         fnd = 0;
1129         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1130                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1131                 if (sin_a6->sin6_family == AF_INET6) {
1132                         fnd = 1;
1133                         sin6->sin6_port = stcb->rport;
1134                         sin6->sin6_addr = sin_a6->sin6_addr;
1135                         break;
1136                 }
1137         }
1138         SCTP_TCB_UNLOCK(stcb);
1139         if (!fnd) {
1140                 /* No IPv4 address */
1141                 SCTP_FREE_SONAME(sin6);
1142                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1143                 return (ENOENT);
1144         }
1145         if ((error = sa6_recoverscope(sin6)) != 0)
1146                 return (error);
1147         *addr = (struct sockaddr *)sin6;
1148         return (0);
1149 }
1150
1151 static int
1152 sctp6_in6getaddr(struct socket *so, struct sockaddr **nam)
1153 {
1154 #ifdef INET
1155         struct sockaddr *addr;
1156
1157 #endif
1158         struct in6pcb *inp6 = sotoin6pcb(so);
1159         int error;
1160
1161         if (inp6 == NULL) {
1162                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1163                 return (EINVAL);
1164         }
1165         /* allow v6 addresses precedence */
1166         error = sctp6_getaddr(so, nam);
1167 #ifdef INET
1168         if (error) {
1169                 /* try v4 next if v6 failed */
1170                 error = sctp_ingetaddr(so, nam);
1171                 if (error) {
1172                         return (error);
1173                 }
1174                 addr = *nam;
1175                 /* if I'm V6ONLY, convert it to v4-mapped */
1176                 if (SCTP_IPV6_V6ONLY(inp6)) {
1177                         struct sockaddr_in6 sin6;
1178
1179                         in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
1180                         memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
1181                 }
1182         }
1183 #endif
1184         return (error);
1185 }
1186
1187
1188 static int
1189 sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
1190 {
1191 #ifdef INET
1192         struct sockaddr *addr;
1193
1194 #endif
1195         struct in6pcb *inp6 = sotoin6pcb(so);
1196         int error;
1197
1198         if (inp6 == NULL) {
1199                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1200                 return (EINVAL);
1201         }
1202         /* allow v6 addresses precedence */
1203         error = sctp6_peeraddr(so, nam);
1204 #ifdef INET
1205         if (error) {
1206                 /* try v4 next if v6 failed */
1207                 error = sctp_peeraddr(so, nam);
1208                 if (error) {
1209                         return (error);
1210                 }
1211                 addr = *nam;
1212                 /* if I'm V6ONLY, convert it to v4-mapped */
1213                 if (SCTP_IPV6_V6ONLY(inp6)) {
1214                         struct sockaddr_in6 sin6;
1215
1216                         in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
1217                         memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
1218                 }
1219         }
1220 #endif
1221         return (error);
1222 }
1223
1224 struct pr_usrreqs sctp6_usrreqs = {
1225         .pru_abort = sctp6_abort,
1226         .pru_accept = sctp_accept,
1227         .pru_attach = sctp6_attach,
1228         .pru_bind = sctp6_bind,
1229         .pru_connect = sctp6_connect,
1230         .pru_control = in6_control,
1231         .pru_close = sctp6_close,
1232         .pru_detach = sctp6_close,
1233         .pru_sopoll = sopoll_generic,
1234         .pru_flush = sctp_flush,
1235         .pru_disconnect = sctp6_disconnect,
1236         .pru_listen = sctp_listen,
1237         .pru_peeraddr = sctp6_getpeeraddr,
1238         .pru_send = sctp6_send,
1239         .pru_shutdown = sctp_shutdown,
1240         .pru_sockaddr = sctp6_in6getaddr,
1241         .pru_sosend = sctp_sosend,
1242         .pru_soreceive = sctp_soreceive
1243 };
1244
1245 #endif