The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netinet6/sctp6_usrreq.c

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    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: releng/8.4/sys/netinet6/sctp6_usrreq.c 248005 2013-03-08 00:54:48Z tuexen $");
   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_with_port(struct mbuf **i_pak, int *offp, uint16_t port)
   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 
   88         iphlen = *offp;
   89         if (SCTP_GET_PKT_VRFID(*i_pak, vrf_id)) {
   90                 SCTP_RELEASE_PKT(*i_pak);
   91                 return (IPPROTO_DONE);
   92         }
   93         m = SCTP_HEADER_TO_CHAIN(*i_pak);
   94 #ifdef SCTP_MBUF_LOGGING
   95         /* Log in any input mbufs */
   96         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
   97                 struct mbuf *mat;
   98 
   99                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
  100                         if (SCTP_BUF_IS_EXTENDED(mat)) {
  101                                 sctp_log_mb(mat, SCTP_MBUF_INPUT);
  102                         }
  103                 }
  104         }
  105 #endif
  106 #ifdef SCTP_PACKET_LOGGING
  107         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
  108                 sctp_packet_log(m);
  109         }
  110 #endif
  111         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
  112             "sctp6_input(): Packet of length %d received on %s with csum_flags 0x%x.\n",
  113             m->m_pkthdr.len,
  114             if_name(m->m_pkthdr.rcvif),
  115             m->m_pkthdr.csum_flags);
  116         if (m->m_flags & M_FLOWID) {
  117                 mflowid = m->m_pkthdr.flowid;
  118                 use_mflowid = 1;
  119         } else {
  120                 mflowid = 0;
  121                 use_mflowid = 0;
  122         }
  123         SCTP_STAT_INCR(sctps_recvpackets);
  124         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
  125         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
  126         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
  127         ip6 = mtod(m, struct ip6_hdr *);
  128         IP6_EXTHDR_GET(sh, struct sctphdr *, m, iphlen,
  129             (int)(sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr)));
  130         if (sh == NULL) {
  131                 SCTP_STAT_INCR(sctps_hdrops);
  132                 return (IPPROTO_DONE);
  133         }
  134         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
  135         offset -= sizeof(struct sctp_chunkhdr);
  136         memset(&src, 0, sizeof(struct sockaddr_in6));
  137         src.sin6_family = AF_INET6;
  138         src.sin6_len = sizeof(struct sockaddr_in6);
  139         src.sin6_port = sh->src_port;
  140         src.sin6_addr = ip6->ip6_src;
  141         if (in6_setscope(&src.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
  142                 goto out;
  143         }
  144         memset(&dst, 0, sizeof(struct sockaddr_in6));
  145         dst.sin6_family = AF_INET6;
  146         dst.sin6_len = sizeof(struct sockaddr_in6);
  147         dst.sin6_port = sh->dest_port;
  148         dst.sin6_addr = ip6->ip6_dst;
  149         if (in6_setscope(&dst.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
  150                 goto out;
  151         }
  152         if (faithprefix_p != NULL && (*faithprefix_p) (&dst.sin6_addr)) {
  153                 /* XXX send icmp6 host/port unreach? */
  154                 goto out;
  155         }
  156         length = ntohs(ip6->ip6_plen) + iphlen;
  157         /* Validate mbuf chain length with IP payload length. */
  158         if (SCTP_HEADER_LEN(m) != length) {
  159                 SCTPDBG(SCTP_DEBUG_INPUT1,
  160                     "sctp6_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
  161                 SCTP_STAT_INCR(sctps_hdrops);
  162                 goto out;
  163         }
  164         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
  165                 goto out;
  166         }
  167         ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff);
  168 #if defined(SCTP_WITH_NO_CSUM)
  169         SCTP_STAT_INCR(sctps_recvnocrc);
  170 #else
  171         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
  172                 SCTP_STAT_INCR(sctps_recvhwcrc);
  173                 compute_crc = 0;
  174         } else {
  175                 SCTP_STAT_INCR(sctps_recvswcrc);
  176                 compute_crc = 1;
  177         }
  178 #endif
  179         sctp_common_input_processing(&m, iphlen, offset, length,
  180             (struct sockaddr *)&src,
  181             (struct sockaddr *)&dst,
  182             sh, ch,
  183 #if !defined(SCTP_WITH_NO_CSUM)
  184             compute_crc,
  185 #endif
  186             ecn_bits,
  187             use_mflowid, mflowid,
  188             vrf_id, port);
  189 out:
  190         if (m) {
  191                 sctp_m_freem(m);
  192         }
  193         return (IPPROTO_DONE);
  194 }
  195 
  196 
  197 int
  198 sctp6_input(struct mbuf **i_pak, int *offp, int proto SCTP_UNUSED)
  199 {
  200         return (sctp6_input_with_port(i_pak, offp, 0));
  201 }
  202 
  203 static void
  204 sctp6_notify_mbuf(struct sctp_inpcb *inp, struct icmp6_hdr *icmp6,
  205     struct sctphdr *sh, struct sctp_tcb *stcb, struct sctp_nets *net)
  206 {
  207         uint32_t nxtsz;
  208 
  209         if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
  210             (icmp6 == NULL) || (sh == NULL)) {
  211                 goto out;
  212         }
  213         /* First do we even look at it? */
  214         if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag))
  215                 goto out;
  216 
  217         if (icmp6->icmp6_type != ICMP6_PACKET_TOO_BIG) {
  218                 /* not PACKET TO BIG */
  219                 goto out;
  220         }
  221         /*
  222          * ok we need to look closely. We could even get smarter and look at
  223          * anyone that we sent to in case we get a different ICMP that tells
  224          * us there is no way to reach a host, but for this impl, all we
  225          * care about is MTU discovery.
  226          */
  227         nxtsz = ntohl(icmp6->icmp6_mtu);
  228         /* Stop any PMTU timer */
  229         sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL, SCTP_FROM_SCTP6_USRREQ + SCTP_LOC_1);
  230 
  231         /* Adjust destination size limit */
  232         if (net->mtu > nxtsz) {
  233                 net->mtu = nxtsz;
  234                 if (net->port) {
  235                         net->mtu -= sizeof(struct udphdr);
  236                 }
  237         }
  238         /* now what about the ep? */
  239         if (stcb->asoc.smallest_mtu > nxtsz) {
  240                 struct sctp_tmit_chunk *chk;
  241 
  242                 /* Adjust that too */
  243                 stcb->asoc.smallest_mtu = nxtsz;
  244                 /* now off to subtract IP_DF flag if needed */
  245 
  246                 TAILQ_FOREACH(chk, &stcb->asoc.send_queue, sctp_next) {
  247                         if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
  248                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
  249                         }
  250                 }
  251                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
  252                         if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
  253                                 /*
  254                                  * For this guy we also mark for immediate
  255                                  * resend since we sent to big of chunk
  256                                  */
  257                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
  258                                 if (chk->sent != SCTP_DATAGRAM_RESEND)
  259                                         stcb->asoc.sent_queue_retran_cnt++;
  260                                 chk->sent = SCTP_DATAGRAM_RESEND;
  261                                 chk->rec.data.doing_fast_retransmit = 0;
  262 
  263                                 chk->sent = SCTP_DATAGRAM_RESEND;
  264                                 /* Clear any time so NO RTT is being done */
  265                                 chk->sent_rcv_time.tv_sec = 0;
  266                                 chk->sent_rcv_time.tv_usec = 0;
  267                                 stcb->asoc.total_flight -= chk->send_size;
  268                                 net->flight_size -= chk->send_size;
  269                         }
  270                 }
  271         }
  272         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL);
  273 out:
  274         if (stcb) {
  275                 SCTP_TCB_UNLOCK(stcb);
  276         }
  277 }
  278 
  279 
  280 void
  281 sctp6_notify(struct sctp_inpcb *inp,
  282     struct icmp6_hdr *icmph,
  283     struct sctphdr *sh,
  284     struct sockaddr *to,
  285     struct sctp_tcb *stcb,
  286     struct sctp_nets *net)
  287 {
  288 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  289         struct socket *so;
  290 
  291 #endif
  292 
  293         /* protection */
  294         if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
  295             (sh == NULL) || (to == NULL)) {
  296                 if (stcb)
  297                         SCTP_TCB_UNLOCK(stcb);
  298                 return;
  299         }
  300         /* First job is to verify the vtag matches what I would send */
  301         if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag)) {
  302                 SCTP_TCB_UNLOCK(stcb);
  303                 return;
  304         }
  305         if (icmph->icmp6_type != ICMP_UNREACH) {
  306                 /* We only care about unreachable */
  307                 SCTP_TCB_UNLOCK(stcb);
  308                 return;
  309         }
  310         if ((icmph->icmp6_code == ICMP_UNREACH_NET) ||
  311             (icmph->icmp6_code == ICMP_UNREACH_HOST) ||
  312             (icmph->icmp6_code == ICMP_UNREACH_NET_UNKNOWN) ||
  313             (icmph->icmp6_code == ICMP_UNREACH_HOST_UNKNOWN) ||
  314             (icmph->icmp6_code == ICMP_UNREACH_ISOLATED) ||
  315             (icmph->icmp6_code == ICMP_UNREACH_NET_PROHIB) ||
  316             (icmph->icmp6_code == ICMP_UNREACH_HOST_PROHIB) ||
  317             (icmph->icmp6_code == ICMP_UNREACH_FILTER_PROHIB)) {
  318 
  319                 /*
  320                  * Hmm reachablity problems we must examine closely. If its
  321                  * not reachable, we may have lost a network. Or if there is
  322                  * NO protocol at the other end named SCTP. well we consider
  323                  * it a OOTB abort.
  324                  */
  325                 if (net->dest_state & SCTP_ADDR_REACHABLE) {
  326                         /* Ok that destination is NOT reachable */
  327                         net->dest_state &= ~SCTP_ADDR_REACHABLE;
  328                         net->dest_state &= ~SCTP_ADDR_PF;
  329                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
  330                             stcb, 0, (void *)net, SCTP_SO_NOT_LOCKED);
  331                 }
  332                 SCTP_TCB_UNLOCK(stcb);
  333         } else if ((icmph->icmp6_code == ICMP_UNREACH_PROTOCOL) ||
  334             (icmph->icmp6_code == ICMP_UNREACH_PORT)) {
  335                 /*
  336                  * Here the peer is either playing tricks on us, including
  337                  * an address that belongs to someone who does not support
  338                  * SCTP OR was a userland implementation that shutdown and
  339                  * now is dead. In either case treat it like a OOTB abort
  340                  * with no TCB
  341                  */
  342                 sctp_abort_notification(stcb, 1, 0, NULL, SCTP_SO_NOT_LOCKED);
  343 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  344                 so = SCTP_INP_SO(inp);
  345                 atomic_add_int(&stcb->asoc.refcnt, 1);
  346                 SCTP_TCB_UNLOCK(stcb);
  347                 SCTP_SOCKET_LOCK(so, 1);
  348                 SCTP_TCB_LOCK(stcb);
  349                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
  350 #endif
  351                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2);
  352 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  353                 SCTP_SOCKET_UNLOCK(so, 1);
  354                 /* SCTP_TCB_UNLOCK(stcb); MT: I think this is not needed. */
  355 #endif
  356                 /* no need to unlock here, since the TCB is gone */
  357         } else {
  358                 SCTP_TCB_UNLOCK(stcb);
  359         }
  360 }
  361 
  362 
  363 
  364 void
  365 sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d)
  366 {
  367         struct sctphdr sh;
  368         struct ip6ctlparam *ip6cp = NULL;
  369         uint32_t vrf_id;
  370 
  371         vrf_id = SCTP_DEFAULT_VRFID;
  372 
  373         if (pktdst->sa_family != AF_INET6 ||
  374             pktdst->sa_len != sizeof(struct sockaddr_in6))
  375                 return;
  376 
  377         if ((unsigned)cmd >= PRC_NCMDS)
  378                 return;
  379         if (PRC_IS_REDIRECT(cmd)) {
  380                 d = NULL;
  381         } else if (inet6ctlerrmap[cmd] == 0) {
  382                 return;
  383         }
  384         /* if the parameter is from icmp6, decode it. */
  385         if (d != NULL) {
  386                 ip6cp = (struct ip6ctlparam *)d;
  387         } else {
  388                 ip6cp = (struct ip6ctlparam *)NULL;
  389         }
  390 
  391         if (ip6cp) {
  392                 /*
  393                  * XXX: We assume that when IPV6 is non NULL, M and OFF are
  394                  * valid.
  395                  */
  396                 /* check if we can safely examine src and dst ports */
  397                 struct sctp_inpcb *inp = NULL;
  398                 struct sctp_tcb *stcb = NULL;
  399                 struct sctp_nets *net = NULL;
  400                 struct sockaddr_in6 final;
  401 
  402                 if (ip6cp->ip6c_m == NULL)
  403                         return;
  404 
  405                 bzero(&sh, sizeof(sh));
  406                 bzero(&final, sizeof(final));
  407                 inp = NULL;
  408                 net = NULL;
  409                 m_copydata(ip6cp->ip6c_m, ip6cp->ip6c_off, sizeof(sh),
  410                     (caddr_t)&sh);
  411                 ip6cp->ip6c_src->sin6_port = sh.src_port;
  412                 final.sin6_len = sizeof(final);
  413                 final.sin6_family = AF_INET6;
  414                 final.sin6_addr = ((struct sockaddr_in6 *)pktdst)->sin6_addr;
  415                 final.sin6_port = sh.dest_port;
  416                 stcb = sctp_findassociation_addr_sa((struct sockaddr *)&final,
  417                     (struct sockaddr *)ip6cp->ip6c_src,
  418                     &inp, &net, 1, vrf_id);
  419                 /* inp's ref-count increased && stcb locked */
  420                 if (stcb != NULL && inp && (inp->sctp_socket != NULL)) {
  421                         if (cmd == PRC_MSGSIZE) {
  422                                 sctp6_notify_mbuf(inp,
  423                                     ip6cp->ip6c_icmp6,
  424                                     &sh,
  425                                     stcb,
  426                                     net);
  427                                 /* inp's ref-count reduced && stcb unlocked */
  428                         } else {
  429                                 sctp6_notify(inp, ip6cp->ip6c_icmp6, &sh,
  430                                     (struct sockaddr *)&final,
  431                                     stcb, net);
  432                                 /* inp's ref-count reduced && stcb unlocked */
  433                         }
  434                 } else {
  435                         if (PRC_IS_REDIRECT(cmd) && inp) {
  436                                 in6_rtchange((struct in6pcb *)inp,
  437                                     inet6ctlerrmap[cmd]);
  438                         }
  439                         if (inp) {
  440                                 /* reduce inp's ref-count */
  441                                 SCTP_INP_WLOCK(inp);
  442                                 SCTP_INP_DECR_REF(inp);
  443                                 SCTP_INP_WUNLOCK(inp);
  444                         }
  445                         if (stcb)
  446                                 SCTP_TCB_UNLOCK(stcb);
  447                 }
  448         }
  449 }
  450 
  451 /*
  452  * this routine can probably be collasped into the one in sctp_userreq.c
  453  * since they do the same thing and now we lookup with a sockaddr
  454  */
  455 static int
  456 sctp6_getcred(SYSCTL_HANDLER_ARGS)
  457 {
  458         struct xucred xuc;
  459         struct sockaddr_in6 addrs[2];
  460         struct sctp_inpcb *inp;
  461         struct sctp_nets *net;
  462         struct sctp_tcb *stcb;
  463         int error;
  464         uint32_t vrf_id;
  465 
  466         vrf_id = SCTP_DEFAULT_VRFID;
  467 
  468         error = priv_check(req->td, PRIV_NETINET_GETCRED);
  469         if (error)
  470                 return (error);
  471 
  472         if (req->newlen != sizeof(addrs)) {
  473                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  474                 return (EINVAL);
  475         }
  476         if (req->oldlen != sizeof(struct ucred)) {
  477                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  478                 return (EINVAL);
  479         }
  480         error = SYSCTL_IN(req, addrs, sizeof(addrs));
  481         if (error)
  482                 return (error);
  483 
  484         stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[1]),
  485             sin6tosa(&addrs[0]),
  486             &inp, &net, 1, vrf_id);
  487         if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) {
  488                 if ((inp != NULL) && (stcb == NULL)) {
  489                         /* reduce ref-count */
  490                         SCTP_INP_WLOCK(inp);
  491                         SCTP_INP_DECR_REF(inp);
  492                         goto cred_can_cont;
  493                 }
  494                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
  495                 error = ENOENT;
  496                 goto out;
  497         }
  498         SCTP_TCB_UNLOCK(stcb);
  499         /*
  500          * We use the write lock here, only since in the error leg we need
  501          * it. If we used RLOCK, then we would have to
  502          * wlock/decr/unlock/rlock. Which in theory could create a hole.
  503          * Better to use higher wlock.
  504          */
  505         SCTP_INP_WLOCK(inp);
  506 cred_can_cont:
  507         error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket);
  508         if (error) {
  509                 SCTP_INP_WUNLOCK(inp);
  510                 goto out;
  511         }
  512         cru2x(inp->sctp_socket->so_cred, &xuc);
  513         SCTP_INP_WUNLOCK(inp);
  514         error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
  515 out:
  516         return (error);
  517 }
  518 
  519 SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW,
  520     0, 0,
  521     sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection");
  522 
  523 
  524 /* This is the same as the sctp_abort() could be made common */
  525 static void
  526 sctp6_abort(struct socket *so)
  527 {
  528         struct sctp_inpcb *inp;
  529         uint32_t flags;
  530 
  531         inp = (struct sctp_inpcb *)so->so_pcb;
  532         if (inp == NULL) {
  533                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  534                 return;
  535         }
  536 sctp_must_try_again:
  537         flags = inp->sctp_flags;
  538 #ifdef SCTP_LOG_CLOSING
  539         sctp_log_closing(inp, NULL, 17);
  540 #endif
  541         if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) &&
  542             (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) {
  543 #ifdef SCTP_LOG_CLOSING
  544                 sctp_log_closing(inp, NULL, 16);
  545 #endif
  546                 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT,
  547                     SCTP_CALLED_AFTER_CMPSET_OFCLOSE);
  548                 SOCK_LOCK(so);
  549                 SCTP_SB_CLEAR(so->so_snd);
  550                 /*
  551                  * same for the rcv ones, they are only here for the
  552                  * accounting/select.
  553                  */
  554                 SCTP_SB_CLEAR(so->so_rcv);
  555                 /* Now null out the reference, we are completely detached. */
  556                 so->so_pcb = NULL;
  557                 SOCK_UNLOCK(so);
  558         } else {
  559                 flags = inp->sctp_flags;
  560                 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) {
  561                         goto sctp_must_try_again;
  562                 }
  563         }
  564         return;
  565 }
  566 
  567 static int
  568 sctp6_attach(struct socket *so, int proto SCTP_UNUSED, struct thread *p SCTP_UNUSED)
  569 {
  570         struct in6pcb *inp6;
  571         int error;
  572         struct sctp_inpcb *inp;
  573         uint32_t vrf_id = SCTP_DEFAULT_VRFID;
  574 
  575         inp = (struct sctp_inpcb *)so->so_pcb;
  576         if (inp != NULL) {
  577                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  578                 return (EINVAL);
  579         }
  580         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
  581                 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace));
  582                 if (error)
  583                         return (error);
  584         }
  585         error = sctp_inpcb_alloc(so, vrf_id);
  586         if (error)
  587                 return (error);
  588         inp = (struct sctp_inpcb *)so->so_pcb;
  589         SCTP_INP_WLOCK(inp);
  590         inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6;     /* I'm v6! */
  591         inp6 = (struct in6pcb *)inp;
  592 
  593         inp6->inp_vflag |= INP_IPV6;
  594         inp6->in6p_hops = -1;   /* use kernel default */
  595         inp6->in6p_cksum = -1;  /* just to be sure */
  596 #ifdef INET
  597         /*
  598          * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6
  599          * socket as well, because the socket may be bound to an IPv6
  600          * wildcard address, which may match an IPv4-mapped IPv6 address.
  601          */
  602         inp6->inp_ip_ttl = MODULE_GLOBAL(ip_defttl);
  603 #endif
  604         /*
  605          * Hmm what about the IPSEC stuff that is missing here but in
  606          * sctp_attach()?
  607          */
  608         SCTP_INP_WUNLOCK(inp);
  609         return (0);
  610 }
  611 
  612 static int
  613 sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p)
  614 {
  615         struct sctp_inpcb *inp;
  616         struct in6pcb *inp6;
  617         int error;
  618 
  619         inp = (struct sctp_inpcb *)so->so_pcb;
  620         if (inp == NULL) {
  621                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  622                 return (EINVAL);
  623         }
  624         if (addr) {
  625                 switch (addr->sa_family) {
  626 #ifdef INET
  627                 case AF_INET:
  628                         if (addr->sa_len != sizeof(struct sockaddr_in)) {
  629                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  630                                 return (EINVAL);
  631                         }
  632                         break;
  633 #endif
  634 #ifdef INET6
  635                 case AF_INET6:
  636                         if (addr->sa_len != sizeof(struct sockaddr_in6)) {
  637                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  638                                 return (EINVAL);
  639                         }
  640                         break;
  641 #endif
  642                 default:
  643                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  644                         return (EINVAL);
  645                 }
  646         }
  647         inp6 = (struct in6pcb *)inp;
  648         inp6->inp_vflag &= ~INP_IPV4;
  649         inp6->inp_vflag |= INP_IPV6;
  650         if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp6) == 0)) {
  651                 switch (addr->sa_family) {
  652 #ifdef INET
  653                 case AF_INET:
  654                         /* binding v4 addr to v6 socket, so reset flags */
  655                         inp6->inp_vflag |= INP_IPV4;
  656                         inp6->inp_vflag &= ~INP_IPV6;
  657                         break;
  658 #endif
  659 #ifdef INET6
  660                 case AF_INET6:
  661                         {
  662                                 struct sockaddr_in6 *sin6_p;
  663 
  664                                 sin6_p = (struct sockaddr_in6 *)addr;
  665 
  666                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
  667                                         inp6->inp_vflag |= INP_IPV4;
  668                                 }
  669 #ifdef INET
  670                                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
  671                                         struct sockaddr_in sin;
  672 
  673                                         in6_sin6_2_sin(&sin, sin6_p);
  674                                         inp6->inp_vflag |= INP_IPV4;
  675                                         inp6->inp_vflag &= ~INP_IPV6;
  676                                         error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p);
  677                                         return (error);
  678                                 }
  679 #endif
  680                                 break;
  681                         }
  682 #endif
  683                 default:
  684                         break;
  685                 }
  686         } else if (addr != NULL) {
  687                 struct sockaddr_in6 *sin6_p;
  688 
  689                 /* IPV6_V6ONLY socket */
  690 #ifdef INET
  691                 if (addr->sa_family == AF_INET) {
  692                         /* can't bind v4 addr to v6 only socket! */
  693                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  694                         return (EINVAL);
  695                 }
  696 #endif
  697                 sin6_p = (struct sockaddr_in6 *)addr;
  698 
  699                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
  700                         /* can't bind v4-mapped addrs either! */
  701                         /* NOTE: we don't support SIIT */
  702                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  703                         return (EINVAL);
  704                 }
  705         }
  706         error = sctp_inpcb_bind(so, addr, NULL, p);
  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                 if (!MODULE_GLOBAL(ip6_v6only)) {
  791                         struct sockaddr_in sin;
  792 
  793                         /* convert v4-mapped into v4 addr and send */
  794                         in6_sin6_2_sin(&sin, sin6);
  795                         return (sctp_sendm(so, flags, m, (struct sockaddr *)&sin,
  796                             control, p));
  797                 } else {
  798                         /* mapped addresses aren't enabled */
  799                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  800                         return (EINVAL);
  801                 }
  802         }
  803 #endif                          /* INET */
  804 connected_type:
  805         /* now what about control */
  806         if (control) {
  807                 if (inp->control) {
  808                         SCTP_PRINTF("huh? control set?\n");
  809                         SCTP_RELEASE_PKT(inp->control);
  810                         inp->control = NULL;
  811                 }
  812                 inp->control = control;
  813         }
  814         /* Place the data */
  815         if (inp->pkt) {
  816                 SCTP_BUF_NEXT(inp->pkt_last) = m;
  817                 inp->pkt_last = m;
  818         } else {
  819                 inp->pkt_last = inp->pkt = m;
  820         }
  821         if (
  822         /* FreeBSD and MacOSX uses a flag passed */
  823             ((flags & PRUS_MORETOCOME) == 0)
  824             ) {
  825                 /*
  826                  * note with the current version this code will only be used
  827                  * by OpenBSD, NetBSD and FreeBSD have methods for
  828                  * re-defining sosend() to use sctp_sosend().  One can
  829                  * optionaly switch back to this code (by changing back the
  830                  * defininitions but this is not advisable.
  831                  */
  832                 int ret;
  833 
  834                 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
  835                 inp->pkt = NULL;
  836                 inp->control = NULL;
  837                 return (ret);
  838         } else {
  839                 return (0);
  840         }
  841 }
  842 
  843 static int
  844 sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
  845 {
  846         uint32_t vrf_id;
  847         int error = 0;
  848         struct sctp_inpcb *inp;
  849         struct in6pcb *inp6;
  850         struct sctp_tcb *stcb;
  851 
  852 #ifdef INET
  853         struct sockaddr_in6 *sin6;
  854         struct sockaddr_storage ss;
  855 
  856 #endif
  857 
  858         inp6 = (struct in6pcb *)so->so_pcb;
  859         inp = (struct sctp_inpcb *)so->so_pcb;
  860         if (inp == NULL) {
  861                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
  862                 return (ECONNRESET);    /* I made the same as TCP since we are
  863                                          * not setup? */
  864         }
  865         if (addr == NULL) {
  866                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  867                 return (EINVAL);
  868         }
  869         switch (addr->sa_family) {
  870 #ifdef INET
  871         case AF_INET:
  872                 if (addr->sa_len != sizeof(struct sockaddr_in)) {
  873                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  874                         return (EINVAL);
  875                 }
  876                 break;
  877 #endif
  878 #ifdef INET6
  879         case AF_INET6:
  880                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
  881                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  882                         return (EINVAL);
  883                 }
  884                 break;
  885 #endif
  886         default:
  887                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  888                 return (EINVAL);
  889         }
  890 
  891         vrf_id = inp->def_vrf_id;
  892         SCTP_ASOC_CREATE_LOCK(inp);
  893         SCTP_INP_RLOCK(inp);
  894         if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) ==
  895             SCTP_PCB_FLAGS_UNBOUND) {
  896                 /* Bind a ephemeral port */
  897                 SCTP_INP_RUNLOCK(inp);
  898                 error = sctp6_bind(so, NULL, p);
  899                 if (error) {
  900                         SCTP_ASOC_CREATE_UNLOCK(inp);
  901 
  902                         return (error);
  903                 }
  904                 SCTP_INP_RLOCK(inp);
  905         }
  906         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
  907             (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) {
  908                 /* We are already connected AND the TCP model */
  909                 SCTP_INP_RUNLOCK(inp);
  910                 SCTP_ASOC_CREATE_UNLOCK(inp);
  911                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE);
  912                 return (EADDRINUSE);
  913         }
  914 #ifdef INET
  915         sin6 = (struct sockaddr_in6 *)addr;
  916         if (SCTP_IPV6_V6ONLY(inp6)) {
  917                 /*
  918                  * if IPV6_V6ONLY flag, ignore connections destined to a v4
  919                  * addr or v4-mapped addr
  920                  */
  921                 if (addr->sa_family == AF_INET) {
  922                         SCTP_INP_RUNLOCK(inp);
  923                         SCTP_ASOC_CREATE_UNLOCK(inp);
  924                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  925                         return (EINVAL);
  926                 }
  927                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
  928                         SCTP_INP_RUNLOCK(inp);
  929                         SCTP_ASOC_CREATE_UNLOCK(inp);
  930                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  931                         return (EINVAL);
  932                 }
  933         }
  934         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
  935                 if (!MODULE_GLOBAL(ip6_v6only)) {
  936                         /* convert v4-mapped into v4 addr */
  937                         in6_sin6_2_sin((struct sockaddr_in *)&ss, sin6);
  938                         addr = (struct sockaddr *)&ss;
  939                 } else {
  940                         /* mapped addresses aren't enabled */
  941                         SCTP_INP_RUNLOCK(inp);
  942                         SCTP_ASOC_CREATE_UNLOCK(inp);
  943                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  944                         return (EINVAL);
  945                 }
  946         }
  947 #endif                          /* INET */
  948         /* Now do we connect? */
  949         if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
  950                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
  951                 if (stcb) {
  952                         SCTP_TCB_UNLOCK(stcb);
  953                 }
  954                 SCTP_INP_RUNLOCK(inp);
  955         } else {
  956                 SCTP_INP_RUNLOCK(inp);
  957                 SCTP_INP_WLOCK(inp);
  958                 SCTP_INP_INCR_REF(inp);
  959                 SCTP_INP_WUNLOCK(inp);
  960                 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL);
  961                 if (stcb == NULL) {
  962                         SCTP_INP_WLOCK(inp);
  963                         SCTP_INP_DECR_REF(inp);
  964                         SCTP_INP_WUNLOCK(inp);
  965                 }
  966         }
  967 
  968         if (stcb != NULL) {
  969                 /* Already have or am bring up an association */
  970                 SCTP_ASOC_CREATE_UNLOCK(inp);
  971                 SCTP_TCB_UNLOCK(stcb);
  972                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY);
  973                 return (EALREADY);
  974         }
  975         /* We are GOOD to go */
  976         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id, p);
  977         SCTP_ASOC_CREATE_UNLOCK(inp);
  978         if (stcb == NULL) {
  979                 /* Gak! no memory */
  980                 return (error);
  981         }
  982         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
  983                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
  984                 /* Set the connected flag so we can queue data */
  985                 soisconnecting(so);
  986         }
  987         stcb->asoc.state = SCTP_STATE_COOKIE_WAIT;
  988         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
  989 
  990         /* initialize authentication parameters for the assoc */
  991         sctp_initialize_auth_params(inp, stcb);
  992 
  993         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
  994         SCTP_TCB_UNLOCK(stcb);
  995         return (error);
  996 }
  997 
  998 static int
  999 sctp6_getaddr(struct socket *so, struct sockaddr **addr)
 1000 {
 1001         struct sockaddr_in6 *sin6;
 1002         struct sctp_inpcb *inp;
 1003         uint32_t vrf_id;
 1004         struct sctp_ifa *sctp_ifa;
 1005 
 1006         int error;
 1007 
 1008         /*
 1009          * Do the malloc first in case it blocks.
 1010          */
 1011         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof(*sin6));
 1012         if (sin6 == NULL)
 1013                 return (ENOMEM);
 1014         sin6->sin6_family = AF_INET6;
 1015         sin6->sin6_len = sizeof(*sin6);
 1016 
 1017         inp = (struct sctp_inpcb *)so->so_pcb;
 1018         if (inp == NULL) {
 1019                 SCTP_FREE_SONAME(sin6);
 1020                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 1021                 return (ECONNRESET);
 1022         }
 1023         SCTP_INP_RLOCK(inp);
 1024         sin6->sin6_port = inp->sctp_lport;
 1025         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
 1026                 /* For the bound all case you get back 0 */
 1027                 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
 1028                         struct sctp_tcb *stcb;
 1029                         struct sockaddr_in6 *sin_a6;
 1030                         struct sctp_nets *net;
 1031                         int fnd;
 1032 
 1033                         stcb = LIST_FIRST(&inp->sctp_asoc_list);
 1034                         if (stcb == NULL) {
 1035                                 goto notConn6;
 1036                         }
 1037                         fnd = 0;
 1038                         sin_a6 = NULL;
 1039                         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 1040                                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 1041                                 if (sin_a6 == NULL)
 1042                                         /* this will make coverity happy */
 1043                                         continue;
 1044 
 1045                                 if (sin_a6->sin6_family == AF_INET6) {
 1046                                         fnd = 1;
 1047                                         break;
 1048                                 }
 1049                         }
 1050                         if ((!fnd) || (sin_a6 == NULL)) {
 1051                                 /* punt */
 1052                                 goto notConn6;
 1053                         }
 1054                         vrf_id = inp->def_vrf_id;
 1055                         sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *) & net->ro, net, 0, vrf_id);
 1056                         if (sctp_ifa) {
 1057                                 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr;
 1058                         }
 1059                 } else {
 1060                         /* For the bound all case you get back 0 */
 1061         notConn6:
 1062                         memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr));
 1063                 }
 1064         } else {
 1065                 /* Take the first IPv6 address in the list */
 1066                 struct sctp_laddr *laddr;
 1067                 int fnd = 0;
 1068 
 1069                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
 1070                         if (laddr->ifa->address.sa.sa_family == AF_INET6) {
 1071                                 struct sockaddr_in6 *sin_a;
 1072 
 1073                                 sin_a = (struct sockaddr_in6 *)&laddr->ifa->address.sin6;
 1074                                 sin6->sin6_addr = sin_a->sin6_addr;
 1075                                 fnd = 1;
 1076                                 break;
 1077                         }
 1078                 }
 1079                 if (!fnd) {
 1080                         SCTP_FREE_SONAME(sin6);
 1081                         SCTP_INP_RUNLOCK(inp);
 1082                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 1083                         return (ENOENT);
 1084                 }
 1085         }
 1086         SCTP_INP_RUNLOCK(inp);
 1087         /* Scoping things for v6 */
 1088         if ((error = sa6_recoverscope(sin6)) != 0) {
 1089                 SCTP_FREE_SONAME(sin6);
 1090                 return (error);
 1091         }
 1092         (*addr) = (struct sockaddr *)sin6;
 1093         return (0);
 1094 }
 1095 
 1096 static int
 1097 sctp6_peeraddr(struct socket *so, struct sockaddr **addr)
 1098 {
 1099         struct sockaddr_in6 *sin6;
 1100         int fnd;
 1101         struct sockaddr_in6 *sin_a6;
 1102         struct sctp_inpcb *inp;
 1103         struct sctp_tcb *stcb;
 1104         struct sctp_nets *net;
 1105         int error;
 1106 
 1107         /* Do the malloc first in case it blocks. */
 1108         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
 1109         if (sin6 == NULL)
 1110                 return (ENOMEM);
 1111         sin6->sin6_family = AF_INET6;
 1112         sin6->sin6_len = sizeof(*sin6);
 1113 
 1114         inp = (struct sctp_inpcb *)so->so_pcb;
 1115         if ((inp == NULL) ||
 1116             ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
 1117                 /* UDP type and listeners will drop out here */
 1118                 SCTP_FREE_SONAME(sin6);
 1119                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN);
 1120                 return (ENOTCONN);
 1121         }
 1122         SCTP_INP_RLOCK(inp);
 1123         stcb = LIST_FIRST(&inp->sctp_asoc_list);
 1124         if (stcb) {
 1125                 SCTP_TCB_LOCK(stcb);
 1126         }
 1127         SCTP_INP_RUNLOCK(inp);
 1128         if (stcb == NULL) {
 1129                 SCTP_FREE_SONAME(sin6);
 1130                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 1131                 return (ECONNRESET);
 1132         }
 1133         fnd = 0;
 1134         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 1135                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 1136                 if (sin_a6->sin6_family == AF_INET6) {
 1137                         fnd = 1;
 1138                         sin6->sin6_port = stcb->rport;
 1139                         sin6->sin6_addr = sin_a6->sin6_addr;
 1140                         break;
 1141                 }
 1142         }
 1143         SCTP_TCB_UNLOCK(stcb);
 1144         if (!fnd) {
 1145                 /* No IPv4 address */
 1146                 SCTP_FREE_SONAME(sin6);
 1147                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 1148                 return (ENOENT);
 1149         }
 1150         if ((error = sa6_recoverscope(sin6)) != 0)
 1151                 return (error);
 1152         *addr = (struct sockaddr *)sin6;
 1153         return (0);
 1154 }
 1155 
 1156 static int
 1157 sctp6_in6getaddr(struct socket *so, struct sockaddr **nam)
 1158 {
 1159 #ifdef INET
 1160         struct sockaddr *addr;
 1161 
 1162 #endif
 1163         struct in6pcb *inp6 = sotoin6pcb(so);
 1164         int error;
 1165 
 1166         if (inp6 == NULL) {
 1167                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 1168                 return (EINVAL);
 1169         }
 1170         /* allow v6 addresses precedence */
 1171         error = sctp6_getaddr(so, nam);
 1172 #ifdef INET
 1173         if (error) {
 1174                 /* try v4 next if v6 failed */
 1175                 error = sctp_ingetaddr(so, nam);
 1176                 if (error) {
 1177                         return (error);
 1178                 }
 1179                 addr = *nam;
 1180                 /* if I'm V6ONLY, convert it to v4-mapped */
 1181                 if (SCTP_IPV6_V6ONLY(inp6)) {
 1182                         struct sockaddr_in6 sin6;
 1183 
 1184                         in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
 1185                         memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
 1186                 }
 1187         }
 1188 #endif
 1189         return (error);
 1190 }
 1191 
 1192 
 1193 static int
 1194 sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
 1195 {
 1196 #ifdef INET
 1197         struct sockaddr *addr;
 1198 
 1199 #endif
 1200         struct in6pcb *inp6 = sotoin6pcb(so);
 1201         int error;
 1202 
 1203         if (inp6 == NULL) {
 1204                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 1205                 return (EINVAL);
 1206         }
 1207         /* allow v6 addresses precedence */
 1208         error = sctp6_peeraddr(so, nam);
 1209 #ifdef INET
 1210         if (error) {
 1211                 /* try v4 next if v6 failed */
 1212                 error = sctp_peeraddr(so, nam);
 1213                 if (error) {
 1214                         return (error);
 1215                 }
 1216                 addr = *nam;
 1217                 /* if I'm V6ONLY, convert it to v4-mapped */
 1218                 if (SCTP_IPV6_V6ONLY(inp6)) {
 1219                         struct sockaddr_in6 sin6;
 1220 
 1221                         in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
 1222                         memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
 1223                 }
 1224         }
 1225 #endif
 1226         return (error);
 1227 }
 1228 
 1229 struct pr_usrreqs sctp6_usrreqs = {
 1230         .pru_abort = sctp6_abort,
 1231         .pru_accept = sctp_accept,
 1232         .pru_attach = sctp6_attach,
 1233         .pru_bind = sctp6_bind,
 1234         .pru_connect = sctp6_connect,
 1235         .pru_control = in6_control,
 1236         .pru_close = sctp6_close,
 1237         .pru_detach = sctp6_close,
 1238         .pru_sopoll = sopoll_generic,
 1239         .pru_flush = sctp_flush,
 1240         .pru_disconnect = sctp6_disconnect,
 1241         .pru_listen = sctp_listen,
 1242         .pru_peeraddr = sctp6_getpeeraddr,
 1243         .pru_send = sctp6_send,
 1244         .pru_shutdown = sctp_shutdown,
 1245         .pru_sockaddr = sctp6_in6getaddr,
 1246         .pru_sosend = sctp_sosend,
 1247         .pru_soreceive = sctp_soreceive
 1248 };
 1249 
 1250 #endif

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