The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: 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: stable/10/sys/netinet6/sctp6_usrreq.c 338985 2018-09-27 18:48:50Z gordon $");
   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

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