sys/netinet6/sctp6_usrreq.c

   1 /*-
   2  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * a) Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  *
  12  * b) Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the distribution.
  15  *
  16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <netinet/sctp_os.h>
  37 #ifdef INET6
  38 #include <sys/proc.h>
  39 #include <netinet/sctp_pcb.h>
  40 #include <netinet/sctp_header.h>
  41 #include <netinet/sctp_var.h>
  42 #include <netinet6/sctp6_var.h>
  43 #include <netinet/sctp_sysctl.h>
  44 #include <netinet/sctp_output.h>
  45 #include <netinet/sctp_uio.h>
  46 #include <netinet/sctp_asconf.h>
  47 #include <netinet/sctputil.h>
  48 #include <netinet/sctp_indata.h>
  49 #include <netinet/sctp_timer.h>
  50 #include <netinet/sctp_auth.h>
  51 #include <netinet/sctp_input.h>
  52 #include <netinet/sctp_output.h>
  53 #include <netinet/sctp_bsd_addr.h>
  54 #include <netinet/sctp_crc32.h>
  55 #include <netinet/icmp6.h>
  56 #include <netinet/udp.h>
  57
  58 #ifdef IPSEC
  59 #include <netipsec/ipsec.h>
  60 #include <netipsec/ipsec6.h>
  61 #endif                          /* IPSEC */
  62
  63 extern struct protosw inetsw[];
  64
  65 int
  66 sctp6_input_with_port(struct mbuf **i_pak, int *offp, uint16_t port)
  67 {
  68         struct mbuf *m;
  69         int iphlen;
  70         uint32_t vrf_id;
  71         uint8_t ecn_bits;
  72         struct sockaddr_in6 src, dst;
  73         struct ip6_hdr *ip6;
  74         struct sctphdr *sh;
  75         struct sctp_chunkhdr *ch;
  76         int length, offset;
  77
  78 #if !defined(SCTP_WITH_NO_CSUM)
  79         uint8_t compute_crc;
  80
  81 #endif
  82         uint32_t mflowid;
  83         uint8_t mflowtype;
  84         uint16_t fibnum;
  85
  86         iphlen = *offp;
  87         if (SCTP_GET_PKT_VRFID(*i_pak, vrf_id)) {
  88                 SCTP_RELEASE_PKT(*i_pak);
  89                 return (IPPROTO_DONE);
  90         }
  91         m = SCTP_HEADER_TO_CHAIN(*i_pak);
  92 #ifdef SCTP_MBUF_LOGGING
  93         /* Log in any input mbufs */
  94         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
  95                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
  96         }
  97 #endif
  98 #ifdef SCTP_PACKET_LOGGING
  99         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
 100                 sctp_packet_log(m);
 101         }
 102 #endif
 103         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
 104             "sctp6_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
 105             m->m_pkthdr.len,
 106             if_name(m->m_pkthdr.rcvif),
 107             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
 108         mflowid = m->m_pkthdr.flowid;
 109         mflowtype = M_HASHTYPE_GET(m);
 110         fibnum = M_GETFIB(m);
 111         SCTP_STAT_INCR(sctps_recvpackets);
 112         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
 113         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
 114         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
 115         ip6 = mtod(m, struct ip6_hdr *);
 116         IP6_EXTHDR_GET(sh, struct sctphdr *, m, iphlen,
 117             (int)(sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr)));
 118         if (sh == NULL) {
 119                 SCTP_STAT_INCR(sctps_hdrops);
 120                 return (IPPROTO_DONE);
 121         }
 122         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
 123         offset -= sizeof(struct sctp_chunkhdr);
 124         memset(&src, 0, sizeof(struct sockaddr_in6));
 125         src.sin6_family = AF_INET6;
 126         src.sin6_len = sizeof(struct sockaddr_in6);
 127         src.sin6_port = sh->src_port;
 128         src.sin6_addr = ip6->ip6_src;
 129         if (in6_setscope(&src.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
 130                 goto out;
 131         }
 132         memset(&dst, 0, sizeof(struct sockaddr_in6));
 133         dst.sin6_family = AF_INET6;
 134         dst.sin6_len = sizeof(struct sockaddr_in6);
 135         dst.sin6_port = sh->dest_port;
 136         dst.sin6_addr = ip6->ip6_dst;
 137         if (in6_setscope(&dst.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
 138                 goto out;
 139         }
 140         if (faithprefix_p != NULL && (*faithprefix_p) (&dst.sin6_addr)) {
 141                 /* XXX send icmp6 host/port unreach? */
 142                 goto out;
 143         }
 144         length = ntohs(ip6->ip6_plen) + iphlen;
 145         /* Validate mbuf chain length with IP payload length. */
 146         if (SCTP_HEADER_LEN(m) != length) {
 147                 SCTPDBG(SCTP_DEBUG_INPUT1,
 148                     "sctp6_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
 149                 SCTP_STAT_INCR(sctps_hdrops);
 150                 goto out;
 151         }
 152         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 153                 goto out;
 154         }
 155         ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff);
 156 #if defined(SCTP_WITH_NO_CSUM)
 157         SCTP_STAT_INCR(sctps_recvnocrc);
 158 #else
 159         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
 160                 SCTP_STAT_INCR(sctps_recvhwcrc);
 161                 compute_crc = 0;
 162         } else {
 163                 SCTP_STAT_INCR(sctps_recvswcrc);
 164                 compute_crc = 1;
 165         }
 166 #endif
 167         sctp_common_input_processing(&m, iphlen, offset, length,
 168             (struct sockaddr *)&src,
 169             (struct sockaddr *)&dst,
 170             sh, ch,
 171 #if !defined(SCTP_WITH_NO_CSUM)
 172             compute_crc,
 173 #endif
 174             ecn_bits,
 175             mflowtype, mflowid, fibnum,
 176             vrf_id, port);
 177 out:
 178         if (m) {
 179                 sctp_m_freem(m);
 180         }
 181         return (IPPROTO_DONE);
 182 }
 183
 184
 185 int
 186 sctp6_input(struct mbuf **i_pak, int *offp, int proto SCTP_UNUSED)
 187 {
 188         return (sctp6_input_with_port(i_pak, offp, 0));
 189 }
 190
 191 static void
 192 sctp6_notify_mbuf(struct sctp_inpcb *inp, struct icmp6_hdr *icmp6,
 193     struct sctphdr *sh, struct sctp_tcb *stcb, struct sctp_nets *net)
 194 {
 195         uint32_t nxtsz;
 196
 197         if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
 198             (icmp6 == NULL) || (sh == NULL)) {
 199                 goto out;
 200         }
 201         /* First do we even look at it? */
 202         if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag))
 203                 goto out;
 204
 205         if (icmp6->icmp6_type != ICMP6_PACKET_TOO_BIG) {
 206                 /* not PACKET TO BIG */
 207                 goto out;
 208         }
 209         /*
 210          * ok we need to look closely. We could even get smarter and look at
 211          * anyone that we sent to in case we get a different ICMP that tells
 212          * us there is no way to reach a host, but for this impl, all we
 213          * care about is MTU discovery.
 214          */
 215         nxtsz = ntohl(icmp6->icmp6_mtu);
 216         /* Stop any PMTU timer */
 217         sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL,
 218             SCTP_FROM_SCTP6_USRREQ + SCTP_LOC_1);
 219
 220         /* Adjust destination size limit */
 221         if (net->mtu > nxtsz) {
 222                 net->mtu = nxtsz;
 223                 if (net->port) {
 224                         net->mtu -= sizeof(struct udphdr);
 225                 }
 226         }
 227         /* now what about the ep? */
 228         if (stcb->asoc.smallest_mtu > nxtsz) {
 229                 struct sctp_tmit_chunk *chk;
 230
 231                 /* Adjust that too */
 232                 stcb->asoc.smallest_mtu = nxtsz;
 233                 /* now off to subtract IP_DF flag if needed */
 234
 235                 TAILQ_FOREACH(chk, &stcb->asoc.send_queue, sctp_next) {
 236                         if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
 237                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 238                         }
 239                 }
 240                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
 241                         if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
 242                                 /*
 243                                  * For this guy we also mark for immediate
 244                                  * resend since we sent to big of chunk
 245                                  */
 246                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 247                                 if (chk->sent != SCTP_DATAGRAM_RESEND)
 248                                         stcb->asoc.sent_queue_retran_cnt++;
 249                                 chk->sent = SCTP_DATAGRAM_RESEND;
 250                                 chk->rec.data.doing_fast_retransmit = 0;
 251
 252                                 chk->sent = SCTP_DATAGRAM_RESEND;
 253                                 /* Clear any time so NO RTT is being done */
 254                                 chk->sent_rcv_time.tv_sec = 0;
 255                                 chk->sent_rcv_time.tv_usec = 0;
 256                                 stcb->asoc.total_flight -= chk->send_size;
 257                                 net->flight_size -= chk->send_size;
 258                         }
 259                 }
 260         }
 261         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL);
 262 out:
 263         if (stcb) {
 264                 SCTP_TCB_UNLOCK(stcb);
 265         }
 266 }
 267
 268
 269 void
 270 sctp6_notify(struct sctp_inpcb *inp,
 271     struct icmp6_hdr *icmph,
 272     struct sctphdr *sh,
 273     struct sockaddr *to,
 274     struct sctp_tcb *stcb,
 275     struct sctp_nets *net)
 276 {
 277 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 278         struct socket *so;
 279
 280 #endif
 281
 282         /* protection */
 283         if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
 284             (sh == NULL) || (to == NULL)) {
 285                 if (stcb)
 286                         SCTP_TCB_UNLOCK(stcb);
 287                 return;
 288         }
 289         /* First job is to verify the vtag matches what I would send */
 290         if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag)) {
 291                 SCTP_TCB_UNLOCK(stcb);
 292                 return;
 293         }
 294         if (icmph->icmp6_type != ICMP_UNREACH) {
 295                 /* We only care about unreachable */
 296                 SCTP_TCB_UNLOCK(stcb);
 297                 return;
 298         }
 299         if ((icmph->icmp6_code == ICMP_UNREACH_NET) ||
 300             (icmph->icmp6_code == ICMP_UNREACH_HOST) ||
 301             (icmph->icmp6_code == ICMP_UNREACH_NET_UNKNOWN) ||
 302             (icmph->icmp6_code == ICMP_UNREACH_HOST_UNKNOWN) ||
 303             (icmph->icmp6_code == ICMP_UNREACH_ISOLATED) ||
 304             (icmph->icmp6_code == ICMP_UNREACH_NET_PROHIB) ||
 305             (icmph->icmp6_code == ICMP_UNREACH_HOST_PROHIB) ||
 306             (icmph->icmp6_code == ICMP_UNREACH_FILTER_PROHIB)) {
 307
 308                 /*
 309                  * Hmm reachablity problems we must examine closely. If its
 310                  * not reachable, we may have lost a network. Or if there is
 311                  * NO protocol at the other end named SCTP. well we consider
 312                  * it a OOTB abort.
 313                  */
 314                 if (net->dest_state & SCTP_ADDR_REACHABLE) {
 315                         /* Ok that destination is NOT reachable */
 316                         net->dest_state &= ~SCTP_ADDR_REACHABLE;
 317                         net->dest_state &= ~SCTP_ADDR_PF;
 318                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
 319                             stcb, 0, (void *)net, SCTP_SO_NOT_LOCKED);
 320                 }
 321                 SCTP_TCB_UNLOCK(stcb);
 322         } else if ((icmph->icmp6_code == ICMP_UNREACH_PROTOCOL) ||
 323             (icmph->icmp6_code == ICMP_UNREACH_PORT)) {
 324                 /*
 325                  * Here the peer is either playing tricks on us, including
 326                  * an address that belongs to someone who does not support
 327                  * SCTP OR was a userland implementation that shutdown and
 328                  * now is dead. In either case treat it like a OOTB abort
 329                  * with no TCB
 330                  */
 331                 sctp_abort_notification(stcb, 1, 0, NULL, SCTP_SO_NOT_LOCKED);
 332 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 333                 so = SCTP_INP_SO(inp);
 334                 atomic_add_int(&stcb->asoc.refcnt, 1);
 335                 SCTP_TCB_UNLOCK(stcb);
 336                 SCTP_SOCKET_LOCK(so, 1);
 337                 SCTP_TCB_LOCK(stcb);
 338                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 339 #endif
 340                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
 341                     SCTP_FROM_SCTP6_USRREQ + SCTP_LOC_2);
 342 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 343                 SCTP_SOCKET_UNLOCK(so, 1);
 344                 /* SCTP_TCB_UNLOCK(stcb); MT: I think this is not needed. */
 345 #endif
 346                 /* no need to unlock here, since the TCB is gone */
 347         } else {
 348                 SCTP_TCB_UNLOCK(stcb);
 349         }
 350 }
 351
 352
 353
 354 void
 355 sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d)
 356 {
 357         struct sctphdr sh;
 358         struct ip6ctlparam *ip6cp = NULL;
 359         uint32_t vrf_id;
 360
 361         vrf_id = SCTP_DEFAULT_VRFID;
 362
 363         if (pktdst->sa_family != AF_INET6 ||
 364             pktdst->sa_len != sizeof(struct sockaddr_in6))
 365                 return;
 366
 367         if ((unsigned)cmd >= PRC_NCMDS)
 368                 return;
 369         if (PRC_IS_REDIRECT(cmd)) {
 370                 d = NULL;
 371         } else if (inet6ctlerrmap[cmd] == 0) {
 372                 return;
 373         }
 374         /* if the parameter is from icmp6, decode it. */
 375         if (d != NULL) {
 376                 ip6cp = (struct ip6ctlparam *)d;
 377         } else {
 378                 ip6cp = (struct ip6ctlparam *)NULL;
 379         }
 380
 381         if (ip6cp) {
 382                 /*
 383                  * XXX: We assume that when IPV6 is non NULL, M and OFF are
 384                  * valid.
 385                  */
 386                 struct sctp_inpcb *inp = NULL;
 387                 struct sctp_tcb *stcb = NULL;
 388                 struct sctp_nets *net = NULL;
 389                 struct sockaddr_in6 final;
 390
 391                 if (ip6cp->ip6c_m == NULL)
 392                         return;
 393
 394                 /* Check if we can safely examine the SCTP header. */
 395                 if (ip6cp->ip6c_m->m_pkthdr.len < ip6cp->ip6c_off + sizeof(sh))
 396                         return;
 397
 398                 bzero(&sh, sizeof(sh));
 399                 bzero(&final, sizeof(final));
 400                 inp = NULL;
 401                 net = NULL;
 402                 m_copydata(ip6cp->ip6c_m, ip6cp->ip6c_off, sizeof(sh),
 403                     (caddr_t)&sh);
 404                 ip6cp->ip6c_src->sin6_port = sh.src_port;
 405                 final.sin6_len = sizeof(final);
 406                 final.sin6_family = AF_INET6;
 407                 final.sin6_addr = ((struct sockaddr_in6 *)pktdst)->sin6_addr;
 408                 final.sin6_port = sh.dest_port;
 409                 stcb = sctp_findassociation_addr_sa((struct sockaddr *)&final,
 410                     (struct sockaddr *)ip6cp->ip6c_src,
 411                     &inp, &net, 1, vrf_id);
 412                 /* inp's ref-count increased && stcb locked */
 413                 if (stcb != NULL && inp && (inp->sctp_socket != NULL)) {
 414                         if (cmd == PRC_MSGSIZE) {
 415                                 sctp6_notify_mbuf(inp,
 416                                     ip6cp->ip6c_icmp6,
 417                                     &sh,
 418                                     stcb,
 419                                     net);
 420                                 /* inp's ref-count reduced && stcb unlocked */
 421                         } else {
 422                                 sctp6_notify(inp, ip6cp->ip6c_icmp6, &sh,
 423                                     (struct sockaddr *)&final,
 424                                     stcb, net);
 425                                 /* inp's ref-count reduced && stcb unlocked */
 426                         }
 427                 } else {
 428                         if (PRC_IS_REDIRECT(cmd) && inp) {
 429                                 in6_rtchange((struct in6pcb *)inp,
 430                                     inet6ctlerrmap[cmd]);
 431                         }
 432                         if (inp) {
 433                                 /* reduce inp's ref-count */
 434                                 SCTP_INP_WLOCK(inp);
 435                                 SCTP_INP_DECR_REF(inp);
 436                                 SCTP_INP_WUNLOCK(inp);
 437                         }
 438                         if (stcb)
 439                                 SCTP_TCB_UNLOCK(stcb);
 440                 }
 441         }
 442 }
 443
 444 /*
 445  * this routine can probably be collasped into the one in sctp_userreq.c
 446  * since they do the same thing and now we lookup with a sockaddr
 447  */
 448 static int
 449 sctp6_getcred(SYSCTL_HANDLER_ARGS)
 450 {
 451         struct xucred xuc;
 452         struct sockaddr_in6 addrs[2];
 453         struct sctp_inpcb *inp;
 454         struct sctp_nets *net;
 455         struct sctp_tcb *stcb;
 456         int error;
 457         uint32_t vrf_id;
 458
 459         vrf_id = SCTP_DEFAULT_VRFID;
 460
 461         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 462         if (error)
 463                 return (error);
 464
 465         if (req->newlen != sizeof(addrs)) {
 466                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 467                 return (EINVAL);
 468         }
 469         if (req->oldlen != sizeof(struct ucred)) {
 470                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 471                 return (EINVAL);
 472         }
 473         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 474         if (error)
 475                 return (error);
 476
 477         stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[1]),
 478             sin6tosa(&addrs[0]),
 479             &inp, &net, 1, vrf_id);
 480         if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) {
 481                 if ((inp != NULL) && (stcb == NULL)) {
 482                         /* reduce ref-count */
 483                         SCTP_INP_WLOCK(inp);
 484                         SCTP_INP_DECR_REF(inp);
 485                         goto cred_can_cont;
 486                 }
 487                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 488                 error = ENOENT;
 489                 goto out;
 490         }
 491         SCTP_TCB_UNLOCK(stcb);
 492         /*
 493          * We use the write lock here, only since in the error leg we need
 494          * it. If we used RLOCK, then we would have to
 495          * wlock/decr/unlock/rlock. Which in theory could create a hole.
 496          * Better to use higher wlock.
 497          */
 498         SCTP_INP_WLOCK(inp);
 499 cred_can_cont:
 500         error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket);
 501         if (error) {
 502                 SCTP_INP_WUNLOCK(inp);
 503                 goto out;
 504         }
 505         cru2x(inp->sctp_socket->so_cred, &xuc);
 506         SCTP_INP_WUNLOCK(inp);
 507         error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 508 out:
 509         return (error);
 510 }
 511
 512 SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW,
 513     0, 0,
 514     sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection");
 515
 516
 517 /* This is the same as the sctp_abort() could be made common */
 518 static void
 519 sctp6_abort(struct socket *so)
 520 {
 521         struct sctp_inpcb *inp;
 522         uint32_t flags;
 523
 524         inp = (struct sctp_inpcb *)so->so_pcb;
 525         if (inp == NULL) {
 526                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 527                 return;
 528         }
 529 sctp_must_try_again:
 530         flags = inp->sctp_flags;
 531 #ifdef SCTP_LOG_CLOSING
 532         sctp_log_closing(inp, NULL, 17);
 533 #endif
 534         if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) &&
 535             (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) {
 536 #ifdef SCTP_LOG_CLOSING
 537                 sctp_log_closing(inp, NULL, 16);
 538 #endif
 539                 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT,
 540                     SCTP_CALLED_AFTER_CMPSET_OFCLOSE);
 541                 SOCK_LOCK(so);
 542                 SCTP_SB_CLEAR(so->so_snd);
 543                 /*
 544                  * same for the rcv ones, they are only here for the
 545                  * accounting/select.
 546                  */
 547                 SCTP_SB_CLEAR(so->so_rcv);
 548                 /* Now null out the reference, we are completely detached. */
 549                 so->so_pcb = NULL;
 550                 SOCK_UNLOCK(so);
 551         } else {
 552                 flags = inp->sctp_flags;
 553                 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) {
 554                         goto sctp_must_try_again;
 555                 }
 556         }
 557         return;
 558 }
 559
 560 static int
 561 sctp6_attach(struct socket *so, int proto SCTP_UNUSED, struct thread *p SCTP_UNUSED)
 562 {
 563         struct in6pcb *inp6;
 564         int error;
 565         struct sctp_inpcb *inp;
 566         uint32_t vrf_id = SCTP_DEFAULT_VRFID;
 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         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 574                 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace));
 575                 if (error)
 576                         return (error);
 577         }
 578         error = sctp_inpcb_alloc(so, vrf_id);
 579         if (error)
 580                 return (error);
 581         inp = (struct sctp_inpcb *)so->so_pcb;
 582         SCTP_INP_WLOCK(inp);
 583         inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6;     /* I'm v6! */
 584         inp6 = (struct in6pcb *)inp;
 585
 586         inp6->inp_vflag |= INP_IPV6;
 587         inp6->in6p_hops = -1;   /* use kernel default */
 588         inp6->in6p_cksum = -1;  /* just to be sure */
 589 #ifdef INET
 590         /*
 591          * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6
 592          * socket as well, because the socket may be bound to an IPv6
 593          * wildcard address, which may match an IPv4-mapped IPv6 address.
 594          */
 595         inp6->inp_ip_ttl = MODULE_GLOBAL(ip_defttl);
 596 #endif
 597         /*
 598          * Hmm what about the IPSEC stuff that is missing here but in
 599          * sctp_attach()?
 600          */
 601         SCTP_INP_WUNLOCK(inp);
 602         return (0);
 603 }
 604
 605 static int
 606 sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p)
 607 {
 608         struct sctp_inpcb *inp;
 609         struct in6pcb *inp6;
 610         int error;
 611         u_char vflagsav;
 612
 613         inp = (struct sctp_inpcb *)so->so_pcb;
 614         if (inp == NULL) {
 615                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 616                 return (EINVAL);
 617         }
 618         if (addr) {
 619                 switch (addr->sa_family) {
 620 #ifdef INET
 621                 case AF_INET:
 622                         if (addr->sa_len != sizeof(struct sockaddr_in)) {
 623                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 624                                 return (EINVAL);
 625                         }
 626                         break;
 627 #endif
 628 #ifdef INET6
 629                 case AF_INET6:
 630                         if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 631                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 632                                 return (EINVAL);
 633                         }
 634                         break;
 635 #endif
 636                 default:
 637                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 638                         return (EINVAL);
 639                 }
 640         }
 641         inp6 = (struct in6pcb *)inp;
 642         vflagsav = inp6->inp_vflag;
 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                                         goto out;
 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                         error = EINVAL;
 690                         goto out;
 691                 }
 692 #endif
 693                 sin6_p = (struct sockaddr_in6 *)addr;
 694
 695                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 696                         /* can't bind v4-mapped addrs either! */
 697                         /* NOTE: we don't support SIIT */
 698                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 699                         error = EINVAL;
 700                         goto out;
 701                 }
 702         }
 703         error = sctp_inpcb_bind(so, addr, NULL, p);
 704 out:
 705         if (error != 0)
 706                 inp6->inp_vflag = vflagsav;
 707         return (error);
 708 }
 709
 710
 711 static void
 712 sctp6_close(struct socket *so)
 713 {
 714         sctp_close(so);
 715 }
 716
 717 /* This could be made common with sctp_detach() since they are identical */
 718
 719 static
 720 int
 721 sctp6_disconnect(struct socket *so)
 722 {
 723         return (sctp_disconnect(so));
 724 }
 725
 726
 727 int
 728 sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 729     struct mbuf *control, struct thread *p);
 730
 731
 732 static int
 733 sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 734     struct mbuf *control, struct thread *p)
 735 {
 736         struct sctp_inpcb *inp;
 737         struct in6pcb *inp6;
 738
 739 #ifdef INET
 740         struct sockaddr_in6 *sin6;
 741
 742 #endif                          /* INET */
 743         /* No SPL needed since sctp_output does this */
 744
 745         inp = (struct sctp_inpcb *)so->so_pcb;
 746         if (inp == NULL) {
 747                 if (control) {
 748                         SCTP_RELEASE_PKT(control);
 749                         control = NULL;
 750                 }
 751                 SCTP_RELEASE_PKT(m);
 752                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 753                 return (EINVAL);
 754         }
 755         inp6 = (struct in6pcb *)inp;
 756         /*
 757          * For the TCP model we may get a NULL addr, if we are a connected
 758          * socket thats ok.
 759          */
 760         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) &&
 761             (addr == NULL)) {
 762                 goto connected_type;
 763         }
 764         if (addr == NULL) {
 765                 SCTP_RELEASE_PKT(m);
 766                 if (control) {
 767                         SCTP_RELEASE_PKT(control);
 768                         control = NULL;
 769                 }
 770                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ);
 771                 return (EDESTADDRREQ);
 772         }
 773 #ifdef INET
 774         sin6 = (struct sockaddr_in6 *)addr;
 775         if (SCTP_IPV6_V6ONLY(inp6)) {
 776                 /*
 777                  * if IPV6_V6ONLY flag, we discard datagrams destined to a
 778                  * v4 addr or v4-mapped addr
 779                  */
 780                 if (addr->sa_family == AF_INET) {
 781                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 782                         return (EINVAL);
 783                 }
 784                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 785                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 786                         return (EINVAL);
 787                 }
 788         }
 789         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 790                 struct sockaddr_in sin;
 791
 792                 /* convert v4-mapped into v4 addr and send */
 793                 in6_sin6_2_sin(&sin, sin6);
 794                 return (sctp_sendm(so, flags, m, (struct sockaddr *)&sin, control, p));
 795         }
 796 #endif                          /* INET */
 797 connected_type:
 798         /* now what about control */
 799         if (control) {
 800                 if (inp->control) {
 801                         SCTP_PRINTF("huh? control set?\n");
 802                         SCTP_RELEASE_PKT(inp->control);
 803                         inp->control = NULL;
 804                 }
 805                 inp->control = control;
 806         }
 807         /* Place the data */
 808         if (inp->pkt) {
 809                 SCTP_BUF_NEXT(inp->pkt_last) = m;
 810                 inp->pkt_last = m;
 811         } else {
 812                 inp->pkt_last = inp->pkt = m;
 813         }
 814         if (
 815         /* FreeBSD and MacOSX uses a flag passed */
 816             ((flags & PRUS_MORETOCOME) == 0)
 817             ) {
 818                 /*
 819                  * note with the current version this code will only be used
 820                  * by OpenBSD, NetBSD and FreeBSD have methods for
 821                  * re-defining sosend() to use sctp_sosend().  One can
 822                  * optionaly switch back to this code (by changing back the
 823                  * defininitions but this is not advisable.
 824                  */
 825                 int ret;
 826
 827                 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
 828                 inp->pkt = NULL;
 829                 inp->control = NULL;
 830                 return (ret);
 831         } else {
 832                 return (0);
 833         }
 834 }
 835
 836 static int
 837 sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
 838 {
 839         uint32_t vrf_id;
 840         int error = 0;
 841         struct sctp_inpcb *inp;
 842         struct sctp_tcb *stcb;
 843
 844 #ifdef INET
 845         struct in6pcb *inp6;
 846         struct sockaddr_in6 *sin6;
 847         union sctp_sockstore store;
 848
 849 #endif
 850
 851 #ifdef INET
 852         inp6 = (struct in6pcb *)so->so_pcb;
 853 #endif
 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                 /* convert v4-mapped into v4 addr */
 931                 in6_sin6_2_sin(&store.sin, sin6);
 932                 addr = &store.sa;
 933         }
 934 #endif                          /* INET */
 935         /* Now do we connect? */
 936         if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
 937                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
 938                 if (stcb) {
 939                         SCTP_TCB_UNLOCK(stcb);
 940                 }
 941                 SCTP_INP_RUNLOCK(inp);
 942         } else {
 943                 SCTP_INP_RUNLOCK(inp);
 944                 SCTP_INP_WLOCK(inp);
 945                 SCTP_INP_INCR_REF(inp);
 946                 SCTP_INP_WUNLOCK(inp);
 947                 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL);
 948                 if (stcb == NULL) {
 949                         SCTP_INP_WLOCK(inp);
 950                         SCTP_INP_DECR_REF(inp);
 951                         SCTP_INP_WUNLOCK(inp);
 952                 }
 953         }
 954
 955         if (stcb != NULL) {
 956                 /* Already have or am bring up an association */
 957                 SCTP_ASOC_CREATE_UNLOCK(inp);
 958                 SCTP_TCB_UNLOCK(stcb);
 959                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY);
 960                 return (EALREADY);
 961         }
 962         /* We are GOOD to go */
 963         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id, inp->sctp_ep.pre_open_stream_count, p);
 964         SCTP_ASOC_CREATE_UNLOCK(inp);
 965         if (stcb == NULL) {
 966                 /* Gak! no memory */
 967                 return (error);
 968         }
 969         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
 970                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
 971                 /* Set the connected flag so we can queue data */
 972                 soisconnecting(so);
 973         }
 974         stcb->asoc.state = SCTP_STATE_COOKIE_WAIT;
 975         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
 976
 977         /* initialize authentication parameters for the assoc */
 978         sctp_initialize_auth_params(inp, stcb);
 979
 980         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
 981         SCTP_TCB_UNLOCK(stcb);
 982         return (error);
 983 }
 984
 985 static int
 986 sctp6_getaddr(struct socket *so, struct sockaddr **addr)
 987 {
 988         struct sockaddr_in6 *sin6;
 989         struct sctp_inpcb *inp;
 990         uint32_t vrf_id;
 991         struct sctp_ifa *sctp_ifa;
 992
 993         int error;
 994
 995         /*
 996          * Do the malloc first in case it blocks.
 997          */
 998         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof(*sin6));
 999         if (sin6 == NULL)
1000                 return (ENOMEM);
1001         sin6->sin6_family = AF_INET6;
1002         sin6->sin6_len = sizeof(*sin6);
1003
1004         inp = (struct sctp_inpcb *)so->so_pcb;
1005         if (inp == NULL) {
1006                 SCTP_FREE_SONAME(sin6);
1007                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1008                 return (ECONNRESET);
1009         }
1010         SCTP_INP_RLOCK(inp);
1011         sin6->sin6_port = inp->sctp_lport;
1012         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
1013                 /* For the bound all case you get back 0 */
1014                 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
1015                         struct sctp_tcb *stcb;
1016                         struct sockaddr_in6 *sin_a6;
1017                         struct sctp_nets *net;
1018                         int fnd;
1019
1020                         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1021                         if (stcb == NULL) {
1022                                 SCTP_INP_RUNLOCK(inp);
1023                                 SCTP_FREE_SONAME(sin6);
1024                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1025                                 return (ENOENT);
1026                         }
1027                         fnd = 0;
1028                         sin_a6 = NULL;
1029                         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1030                                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1031                                 if (sin_a6 == NULL)
1032                                         /* this will make coverity happy */
1033                                         continue;
1034
1035                                 if (sin_a6->sin6_family == AF_INET6) {
1036                                         fnd = 1;
1037                                         break;
1038                                 }
1039                         }
1040                         if ((!fnd) || (sin_a6 == NULL)) {
1041                                 /* punt */
1042                                 SCTP_INP_RUNLOCK(inp);
1043                                 SCTP_FREE_SONAME(sin6);
1044                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1045                                 return (ENOENT);
1046                         }
1047                         vrf_id = inp->def_vrf_id;
1048                         sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *) & net->ro, net, 0, vrf_id);
1049                         if (sctp_ifa) {
1050                                 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr;
1051                         }
1052                 } else {
1053                         /* For the bound all case you get back 0 */
1054                         memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr));
1055                 }
1056         } else {
1057                 /* Take the first IPv6 address in the list */
1058                 struct sctp_laddr *laddr;
1059                 int fnd = 0;
1060
1061                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
1062                         if (laddr->ifa->address.sa.sa_family == AF_INET6) {
1063                                 struct sockaddr_in6 *sin_a;
1064
1065                                 sin_a = &laddr->ifa->address.sin6;
1066                                 sin6->sin6_addr = sin_a->sin6_addr;
1067                                 fnd = 1;
1068                                 break;
1069                         }
1070                 }
1071                 if (!fnd) {
1072                         SCTP_FREE_SONAME(sin6);
1073                         SCTP_INP_RUNLOCK(inp);
1074                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1075                         return (ENOENT);
1076                 }
1077         }
1078         SCTP_INP_RUNLOCK(inp);
1079         /* Scoping things for v6 */
1080         if ((error = sa6_recoverscope(sin6)) != 0) {
1081                 SCTP_FREE_SONAME(sin6);
1082                 return (error);
1083         }
1084         (*addr) = (struct sockaddr *)sin6;
1085         return (0);
1086 }
1087
1088 static int
1089 sctp6_peeraddr(struct socket *so, struct sockaddr **addr)
1090 {
1091         struct sockaddr_in6 *sin6;
1092         int fnd;
1093         struct sockaddr_in6 *sin_a6;
1094         struct sctp_inpcb *inp;
1095         struct sctp_tcb *stcb;
1096         struct sctp_nets *net;
1097         int error;
1098
1099         /* Do the malloc first in case it blocks. */
1100         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1101         if (sin6 == NULL)
1102                 return (ENOMEM);
1103         sin6->sin6_family = AF_INET6;
1104         sin6->sin6_len = sizeof(*sin6);
1105
1106         inp = (struct sctp_inpcb *)so->so_pcb;
1107         if ((inp == NULL) ||
1108             ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
1109                 /* UDP type and listeners will drop out here */
1110                 SCTP_FREE_SONAME(sin6);
1111                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN);
1112                 return (ENOTCONN);
1113         }
1114         SCTP_INP_RLOCK(inp);
1115         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1116         if (stcb) {
1117                 SCTP_TCB_LOCK(stcb);
1118         }
1119         SCTP_INP_RUNLOCK(inp);
1120         if (stcb == NULL) {
1121                 SCTP_FREE_SONAME(sin6);
1122                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1123                 return (ECONNRESET);
1124         }
1125         fnd = 0;
1126         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1127                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1128                 if (sin_a6->sin6_family == AF_INET6) {
1129                         fnd = 1;
1130                         sin6->sin6_port = stcb->rport;
1131                         sin6->sin6_addr = sin_a6->sin6_addr;
1132                         break;
1133                 }
1134         }
1135         SCTP_TCB_UNLOCK(stcb);
1136         if (!fnd) {
1137                 /* No IPv4 address */
1138                 SCTP_FREE_SONAME(sin6);
1139                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1140                 return (ENOENT);
1141         }
1142         if ((error = sa6_recoverscope(sin6)) != 0) {
1143                 SCTP_FREE_SONAME(sin6);
1144                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, error);
1145                 return (error);
1146         }
1147         *addr = (struct sockaddr *)sin6;
1148         return (0);
1149 }
1150
1151 static int
1152 sctp6_in6getaddr(struct socket *so, struct sockaddr **nam)
1153 {
1154         struct in6pcb *inp6 = sotoin6pcb(so);
1155         int error;
1156
1157         if (inp6 == NULL) {
1158                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1159                 return (EINVAL);
1160         }
1161         /* allow v6 addresses precedence */
1162         error = sctp6_getaddr(so, nam);
1163 #ifdef INET
1164         if (error) {
1165                 struct sockaddr_in6 *sin6;
1166
1167                 /* try v4 next if v6 failed */
1168                 error = sctp_ingetaddr(so, nam);
1169                 if (error) {
1170                         return (error);
1171                 }
1172                 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1173                 if (sin6 == NULL) {
1174                         SCTP_FREE_SONAME(*nam);
1175                         return (ENOMEM);
1176                 }
1177                 in6_sin_2_v4mapsin6((struct sockaddr_in *)*nam, sin6);
1178                 SCTP_FREE_SONAME(*nam);
1179                 *nam = (struct sockaddr *)sin6;
1180         }
1181 #endif
1182         return (error);
1183 }
1184
1185
1186 static int
1187 sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
1188 {
1189         struct in6pcb *inp6 = sotoin6pcb(so);
1190         int error;
1191
1192         if (inp6 == NULL) {
1193                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1194                 return (EINVAL);
1195         }
1196         /* allow v6 addresses precedence */
1197         error = sctp6_peeraddr(so, nam);
1198 #ifdef INET
1199         if (error) {
1200                 struct sockaddr_in6 *sin6;
1201
1202                 /* try v4 next if v6 failed */
1203                 error = sctp_peeraddr(so, nam);
1204                 if (error) {
1205                         return (error);
1206                 }
1207                 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1208                 if (sin6 == NULL) {
1209                         SCTP_FREE_SONAME(*nam);
1210                         return (ENOMEM);
1211                 }
1212                 in6_sin_2_v4mapsin6((struct sockaddr_in *)*nam, sin6);
1213                 SCTP_FREE_SONAME(*nam);
1214                 *nam = (struct sockaddr *)sin6;
1215         }
1216 #endif
1217         return (error);
1218 }
1219
1220 struct pr_usrreqs sctp6_usrreqs = {
1221         .pru_abort = sctp6_abort,
1222         .pru_accept = sctp_accept,
1223         .pru_attach = sctp6_attach,
1224         .pru_bind = sctp6_bind,
1225         .pru_connect = sctp6_connect,
1226         .pru_control = in6_control,
1227         .pru_close = sctp6_close,
1228         .pru_detach = sctp6_close,
1229         .pru_sopoll = sopoll_generic,
1230         .pru_flush = sctp_flush,
1231         .pru_disconnect = sctp6_disconnect,
1232         .pru_listen = sctp_listen,
1233         .pru_peeraddr = sctp6_getpeeraddr,
1234         .pru_send = sctp6_send,
1235         .pru_shutdown = sctp_shutdown,
1236         .pru_sockaddr = sctp6_in6getaddr,
1237         .pru_sosend = sctp_sosend,
1238         .pru_soreceive = sctp_soreceive
1239 };
1240
1241 #endif