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/udp6_usrreq.c

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    1 /*-
    2  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    3  * Copyright (c) 2010-2011 Juniper Networks, Inc.
    4  * All rights reserved.
    5  *
    6  * Portions of this software were developed by Robert N. M. Watson under
    7  * contract to Juniper Networks, Inc.
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  * 3. Neither the name of the project nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      $KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 jinmei Exp $
   34  *      $KAME: udp6_output.c,v 1.31 2001/05/21 16:39:15 jinmei Exp $
   35  */
   36 
   37 /*-
   38  * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
   39  *      The Regents of the University of California.
   40  * All rights reserved.
   41  *
   42  * Redistribution and use in source and binary forms, with or without
   43  * modification, are permitted provided that the following conditions
   44  * are met:
   45  * 1. Redistributions of source code must retain the above copyright
   46  *    notice, this list of conditions and the following disclaimer.
   47  * 2. Redistributions in binary form must reproduce the above copyright
   48  *    notice, this list of conditions and the following disclaimer in the
   49  *    documentation and/or other materials provided with the distribution.
   50  * 4. Neither the name of the University nor the names of its contributors
   51  *    may be used to endorse or promote products derived from this software
   52  *    without specific prior written permission.
   53  *
   54  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   55  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   56  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   57  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   58  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   59  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   60  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   61  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   62  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   63  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   64  * SUCH DAMAGE.
   65  *
   66  *      @(#)udp_usrreq.c        8.6 (Berkeley) 5/23/95
   67  */
   68 
   69 #include <sys/cdefs.h>
   70 __FBSDID("$FreeBSD: releng/10.0/sys/netinet6/udp6_usrreq.c 254889 2013-08-25 21:54:41Z markj $");
   71 
   72 #include "opt_inet.h"
   73 #include "opt_inet6.h"
   74 #include "opt_ipfw.h"
   75 #include "opt_ipsec.h"
   76 #include "opt_kdtrace.h"
   77 
   78 #include <sys/param.h>
   79 #include <sys/jail.h>
   80 #include <sys/kernel.h>
   81 #include <sys/lock.h>
   82 #include <sys/mbuf.h>
   83 #include <sys/priv.h>
   84 #include <sys/proc.h>
   85 #include <sys/protosw.h>
   86 #include <sys/sdt.h>
   87 #include <sys/signalvar.h>
   88 #include <sys/socket.h>
   89 #include <sys/socketvar.h>
   90 #include <sys/sx.h>
   91 #include <sys/sysctl.h>
   92 #include <sys/syslog.h>
   93 #include <sys/systm.h>
   94 
   95 #include <net/if.h>
   96 #include <net/if_types.h>
   97 #include <net/route.h>
   98 
   99 #include <netinet/in.h>
  100 #include <netinet/in_kdtrace.h>
  101 #include <netinet/in_pcb.h>
  102 #include <netinet/in_systm.h>
  103 #include <netinet/in_var.h>
  104 #include <netinet/ip.h>
  105 #include <netinet/ip_icmp.h>
  106 #include <netinet/ip6.h>
  107 #include <netinet/icmp_var.h>
  108 #include <netinet/icmp6.h>
  109 #include <netinet/ip_var.h>
  110 #include <netinet/udp.h>
  111 #include <netinet/udp_var.h>
  112 
  113 #include <netinet6/ip6protosw.h>
  114 #include <netinet6/ip6_var.h>
  115 #include <netinet6/in6_pcb.h>
  116 #include <netinet6/udp6_var.h>
  117 #include <netinet6/scope6_var.h>
  118 
  119 #ifdef IPSEC
  120 #include <netipsec/ipsec.h>
  121 #include <netipsec/ipsec6.h>
  122 #endif /* IPSEC */
  123 
  124 #include <security/mac/mac_framework.h>
  125 
  126 /*
  127  * UDP protocol implementation.
  128  * Per RFC 768, August, 1980.
  129  */
  130 
  131 extern struct protosw   inetsw[];
  132 static void             udp6_detach(struct socket *so);
  133 
  134 static void
  135 udp6_append(struct inpcb *inp, struct mbuf *n, int off,
  136     struct sockaddr_in6 *fromsa)
  137 {
  138         struct socket *so;
  139         struct mbuf *opts;
  140 
  141         INP_LOCK_ASSERT(inp);
  142 
  143 #ifdef IPSEC
  144         /* Check AH/ESP integrity. */
  145         if (ipsec6_in_reject(n, inp)) {
  146                 m_freem(n);
  147                 IPSEC6STAT_INC(ips_in_polvio);
  148                 return;
  149         }
  150 #endif /* IPSEC */
  151 #ifdef MAC
  152         if (mac_inpcb_check_deliver(inp, n) != 0) {
  153                 m_freem(n);
  154                 return;
  155         }
  156 #endif
  157         opts = NULL;
  158         if (inp->inp_flags & INP_CONTROLOPTS ||
  159             inp->inp_socket->so_options & SO_TIMESTAMP)
  160                 ip6_savecontrol(inp, n, &opts);
  161         m_adj(n, off + sizeof(struct udphdr));
  162 
  163         so = inp->inp_socket;
  164         SOCKBUF_LOCK(&so->so_rcv);
  165         if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)fromsa, n,
  166             opts) == 0) {
  167                 SOCKBUF_UNLOCK(&so->so_rcv);
  168                 m_freem(n);
  169                 if (opts)
  170                         m_freem(opts);
  171                 UDPSTAT_INC(udps_fullsock);
  172         } else
  173                 sorwakeup_locked(so);
  174 }
  175 
  176 int
  177 udp6_input(struct mbuf **mp, int *offp, int proto)
  178 {
  179         struct mbuf *m = *mp;
  180         struct ifnet *ifp;
  181         struct ip6_hdr *ip6;
  182         struct udphdr *uh;
  183         struct inpcb *inp;
  184         struct udpcb *up;
  185         int off = *offp;
  186         int plen, ulen;
  187         struct sockaddr_in6 fromsa;
  188         struct m_tag *fwd_tag;
  189         uint16_t uh_sum;
  190 
  191         ifp = m->m_pkthdr.rcvif;
  192         ip6 = mtod(m, struct ip6_hdr *);
  193 
  194         if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
  195                 /* XXX send icmp6 host/port unreach? */
  196                 m_freem(m);
  197                 return (IPPROTO_DONE);
  198         }
  199 
  200 #ifndef PULLDOWN_TEST
  201         IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
  202         ip6 = mtod(m, struct ip6_hdr *);
  203         uh = (struct udphdr *)((caddr_t)ip6 + off);
  204 #else
  205         IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh));
  206         if (!uh)
  207                 return (IPPROTO_DONE);
  208 #endif
  209 
  210         UDPSTAT_INC(udps_ipackets);
  211 
  212         /*
  213          * Destination port of 0 is illegal, based on RFC768.
  214          */
  215         if (uh->uh_dport == 0)
  216                 goto badunlocked;
  217 
  218         plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
  219         ulen = ntohs((u_short)uh->uh_ulen);
  220 
  221         if (plen != ulen) {
  222                 UDPSTAT_INC(udps_badlen);
  223                 goto badunlocked;
  224         }
  225 
  226         /*
  227          * Checksum extended UDP header and data.
  228          */
  229         if (uh->uh_sum == 0) {
  230                 UDPSTAT_INC(udps_nosum);
  231                 goto badunlocked;
  232         }
  233 
  234         if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID_IPV6) {
  235                 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
  236                         uh_sum = m->m_pkthdr.csum_data;
  237                 else
  238                         uh_sum = in6_cksum_pseudo(ip6, ulen,
  239                             IPPROTO_UDP, m->m_pkthdr.csum_data);
  240                 uh_sum ^= 0xffff;
  241         } else
  242                 uh_sum = in6_cksum(m, IPPROTO_UDP, off, ulen);
  243 
  244         if (uh_sum != 0) {
  245                 UDPSTAT_INC(udps_badsum);
  246                 goto badunlocked;
  247         }
  248 
  249         /*
  250          * Construct sockaddr format source address.
  251          */
  252         init_sin6(&fromsa, m);
  253         fromsa.sin6_port = uh->uh_sport;
  254 
  255         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
  256                 struct inpcb *last;
  257                 struct ip6_moptions *imo;
  258 
  259                 INP_INFO_RLOCK(&V_udbinfo);
  260                 /*
  261                  * In the event that laddr should be set to the link-local
  262                  * address (this happens in RIPng), the multicast address
  263                  * specified in the received packet will not match laddr.  To
  264                  * handle this situation, matching is relaxed if the
  265                  * receiving interface is the same as one specified in the
  266                  * socket and if the destination multicast address matches
  267                  * one of the multicast groups specified in the socket.
  268                  */
  269 
  270                 /*
  271                  * KAME note: traditionally we dropped udpiphdr from mbuf
  272                  * here.  We need udphdr for IPsec processing so we do that
  273                  * later.
  274                  */
  275                 last = NULL;
  276                 LIST_FOREACH(inp, &V_udb, inp_list) {
  277                         if ((inp->inp_vflag & INP_IPV6) == 0)
  278                                 continue;
  279                         if (inp->inp_lport != uh->uh_dport)
  280                                 continue;
  281                         if (inp->inp_fport != 0 &&
  282                             inp->inp_fport != uh->uh_sport)
  283                                 continue;
  284                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
  285                                 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
  286                                                         &ip6->ip6_dst))
  287                                         continue;
  288                         }
  289                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
  290                                 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
  291                                                         &ip6->ip6_src) ||
  292                                     inp->inp_fport != uh->uh_sport)
  293                                         continue;
  294                         }
  295 
  296                         /*
  297                          * XXXRW: Because we weren't holding either the inpcb
  298                          * or the hash lock when we checked for a match 
  299                          * before, we should probably recheck now that the 
  300                          * inpcb lock is (supposed to be) held.
  301                          */
  302 
  303                         /*
  304                          * Handle socket delivery policy for any-source
  305                          * and source-specific multicast. [RFC3678]
  306                          */
  307                         imo = inp->in6p_moptions;
  308                         if (imo && IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
  309                                 struct sockaddr_in6      mcaddr;
  310                                 int                      blocked;
  311 
  312                                 INP_RLOCK(inp);
  313 
  314                                 bzero(&mcaddr, sizeof(struct sockaddr_in6));
  315                                 mcaddr.sin6_len = sizeof(struct sockaddr_in6);
  316                                 mcaddr.sin6_family = AF_INET6;
  317                                 mcaddr.sin6_addr = ip6->ip6_dst;
  318 
  319                                 blocked = im6o_mc_filter(imo, ifp,
  320                                         (struct sockaddr *)&mcaddr,
  321                                         (struct sockaddr *)&fromsa);
  322                                 if (blocked != MCAST_PASS) {
  323                                         if (blocked == MCAST_NOTGMEMBER)
  324                                                 IP6STAT_INC(ip6s_notmember);
  325                                         if (blocked == MCAST_NOTSMEMBER ||
  326                                             blocked == MCAST_MUTED)
  327                                                 UDPSTAT_INC(udps_filtermcast);
  328                                         INP_RUNLOCK(inp); /* XXX */
  329                                         continue;
  330                                 }
  331 
  332                                 INP_RUNLOCK(inp);
  333                         }
  334                         if (last != NULL) {
  335                                 struct mbuf *n;
  336 
  337                                 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
  338                                         INP_RLOCK(last);
  339                                         up = intoudpcb(last);
  340                                         if (up->u_tun_func == NULL) {
  341                                                 udp6_append(last, n, off, &fromsa);
  342                                         } else {
  343                                                 /*
  344                                                  * Engage the tunneling
  345                                                  * protocol we will have to
  346                                                  * leave the info_lock up,
  347                                                  * since we are hunting
  348                                                  * through multiple UDP's.
  349                                                  * 
  350                                                  */
  351                                                 (*up->u_tun_func)(n, off, last);
  352                                         }
  353                                         INP_RUNLOCK(last);
  354                                 }
  355                         }
  356                         last = inp;
  357                         /*
  358                          * Don't look for additional matches if this one does
  359                          * not have either the SO_REUSEPORT or SO_REUSEADDR
  360                          * socket options set.  This heuristic avoids
  361                          * searching through all pcbs in the common case of a
  362                          * non-shared port.  It assumes that an application
  363                          * will never clear these options after setting them.
  364                          */
  365                         if ((last->inp_socket->so_options &
  366                              (SO_REUSEPORT|SO_REUSEADDR)) == 0)
  367                                 break;
  368                 }
  369 
  370                 if (last == NULL) {
  371                         /*
  372                          * No matching pcb found; discard datagram.  (No need
  373                          * to send an ICMP Port Unreachable for a broadcast
  374                          * or multicast datgram.)
  375                          */
  376                         UDPSTAT_INC(udps_noport);
  377                         UDPSTAT_INC(udps_noportmcast);
  378                         goto badheadlocked;
  379                 }
  380                 INP_RLOCK(last);
  381                 INP_INFO_RUNLOCK(&V_udbinfo);
  382                 up = intoudpcb(last);
  383                 UDP_PROBE(receive, NULL, last, ip6, last, uh);
  384                 if (up->u_tun_func == NULL) {
  385                         udp6_append(last, m, off, &fromsa);
  386                 } else {
  387                         /*
  388                          * Engage the tunneling protocol.
  389                          */
  390                         (*up->u_tun_func)(m, off, last);
  391                 }
  392                 INP_RUNLOCK(last);
  393                 return (IPPROTO_DONE);
  394         }
  395         /*
  396          * Locate pcb for datagram.
  397          */
  398 
  399         /*
  400          * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain.
  401          */
  402         if ((m->m_flags & M_IP6_NEXTHOP) &&
  403             (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
  404                 struct sockaddr_in6 *next_hop6;
  405 
  406                 next_hop6 = (struct sockaddr_in6 *)(fwd_tag + 1);
  407 
  408                 /*
  409                  * Transparently forwarded. Pretend to be the destination.
  410                  * Already got one like this?
  411                  */
  412                 inp = in6_pcblookup_mbuf(&V_udbinfo,
  413                     &ip6->ip6_src, uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
  414                     INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif, m);
  415                 if (!inp) {
  416                         /*
  417                          * It's new.  Try to find the ambushing socket.
  418                          * Because we've rewritten the destination address,
  419                          * any hardware-generated hash is ignored.
  420                          */
  421                         inp = in6_pcblookup(&V_udbinfo, &ip6->ip6_src,
  422                             uh->uh_sport, &next_hop6->sin6_addr,
  423                             next_hop6->sin6_port ? htons(next_hop6->sin6_port) :
  424                             uh->uh_dport, INPLOOKUP_WILDCARD |
  425                             INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif);
  426                 }
  427                 /* Remove the tag from the packet. We don't need it anymore. */
  428                 m_tag_delete(m, fwd_tag);
  429                 m->m_flags &= ~M_IP6_NEXTHOP;
  430         } else
  431                 inp = in6_pcblookup_mbuf(&V_udbinfo, &ip6->ip6_src,
  432                     uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
  433                     INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB,
  434                     m->m_pkthdr.rcvif, m);
  435         if (inp == NULL) {
  436                 if (udp_log_in_vain) {
  437                         char ip6bufs[INET6_ADDRSTRLEN];
  438                         char ip6bufd[INET6_ADDRSTRLEN];
  439 
  440                         log(LOG_INFO,
  441                             "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
  442                             ip6_sprintf(ip6bufd, &ip6->ip6_dst),
  443                             ntohs(uh->uh_dport),
  444                             ip6_sprintf(ip6bufs, &ip6->ip6_src),
  445                             ntohs(uh->uh_sport));
  446                 }
  447                 UDPSTAT_INC(udps_noport);
  448                 if (m->m_flags & M_MCAST) {
  449                         printf("UDP6: M_MCAST is set in a unicast packet.\n");
  450                         UDPSTAT_INC(udps_noportmcast);
  451                         goto badunlocked;
  452                 }
  453                 if (V_udp_blackhole)
  454                         goto badunlocked;
  455                 if (badport_bandlim(BANDLIM_ICMP6_UNREACH) < 0)
  456                         goto badunlocked;
  457                 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
  458                 return (IPPROTO_DONE);
  459         }
  460         INP_RLOCK_ASSERT(inp);
  461         up = intoudpcb(inp);
  462         UDP_PROBE(receive, NULL, inp, ip6, inp, uh);
  463         if (up->u_tun_func == NULL) {
  464                 udp6_append(inp, m, off, &fromsa);
  465         } else {
  466                 /*
  467                  * Engage the tunneling protocol.
  468                  */
  469 
  470                 (*up->u_tun_func)(m, off, inp);
  471         }
  472         INP_RUNLOCK(inp);
  473         return (IPPROTO_DONE);
  474 
  475 badheadlocked:
  476         INP_INFO_RUNLOCK(&V_udbinfo);
  477 badunlocked:
  478         if (m)
  479                 m_freem(m);
  480         return (IPPROTO_DONE);
  481 }
  482 
  483 void
  484 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d)
  485 {
  486         struct udphdr uh;
  487         struct ip6_hdr *ip6;
  488         struct mbuf *m;
  489         int off = 0;
  490         struct ip6ctlparam *ip6cp = NULL;
  491         const struct sockaddr_in6 *sa6_src = NULL;
  492         void *cmdarg;
  493         struct inpcb *(*notify)(struct inpcb *, int) = udp_notify;
  494         struct udp_portonly {
  495                 u_int16_t uh_sport;
  496                 u_int16_t uh_dport;
  497         } *uhp;
  498 
  499         if (sa->sa_family != AF_INET6 ||
  500             sa->sa_len != sizeof(struct sockaddr_in6))
  501                 return;
  502 
  503         if ((unsigned)cmd >= PRC_NCMDS)
  504                 return;
  505         if (PRC_IS_REDIRECT(cmd))
  506                 notify = in6_rtchange, d = NULL;
  507         else if (cmd == PRC_HOSTDEAD)
  508                 d = NULL;
  509         else if (inet6ctlerrmap[cmd] == 0)
  510                 return;
  511 
  512         /* if the parameter is from icmp6, decode it. */
  513         if (d != NULL) {
  514                 ip6cp = (struct ip6ctlparam *)d;
  515                 m = ip6cp->ip6c_m;
  516                 ip6 = ip6cp->ip6c_ip6;
  517                 off = ip6cp->ip6c_off;
  518                 cmdarg = ip6cp->ip6c_cmdarg;
  519                 sa6_src = ip6cp->ip6c_src;
  520         } else {
  521                 m = NULL;
  522                 ip6 = NULL;
  523                 cmdarg = NULL;
  524                 sa6_src = &sa6_any;
  525         }
  526 
  527         if (ip6) {
  528                 /*
  529                  * XXX: We assume that when IPV6 is non NULL,
  530                  * M and OFF are valid.
  531                  */
  532 
  533                 /* Check if we can safely examine src and dst ports. */
  534                 if (m->m_pkthdr.len < off + sizeof(*uhp))
  535                         return;
  536 
  537                 bzero(&uh, sizeof(uh));
  538                 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
  539 
  540                 (void) in6_pcbnotify(&V_udbinfo, sa, uh.uh_dport,
  541                     (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd,
  542                     cmdarg, notify);
  543         } else
  544                 (void) in6_pcbnotify(&V_udbinfo, sa, 0,
  545                     (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
  546 }
  547 
  548 static int
  549 udp6_getcred(SYSCTL_HANDLER_ARGS)
  550 {
  551         struct xucred xuc;
  552         struct sockaddr_in6 addrs[2];
  553         struct inpcb *inp;
  554         int error;
  555 
  556         error = priv_check(req->td, PRIV_NETINET_GETCRED);
  557         if (error)
  558                 return (error);
  559 
  560         if (req->newlen != sizeof(addrs))
  561                 return (EINVAL);
  562         if (req->oldlen != sizeof(struct xucred))
  563                 return (EINVAL);
  564         error = SYSCTL_IN(req, addrs, sizeof(addrs));
  565         if (error)
  566                 return (error);
  567         if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 ||
  568             (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) {
  569                 return (error);
  570         }
  571         inp = in6_pcblookup(&V_udbinfo, &addrs[1].sin6_addr,
  572             addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port,
  573             INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
  574         if (inp != NULL) {
  575                 INP_RLOCK_ASSERT(inp);
  576                 if (inp->inp_socket == NULL)
  577                         error = ENOENT;
  578                 if (error == 0)
  579                         error = cr_canseesocket(req->td->td_ucred,
  580                             inp->inp_socket);
  581                 if (error == 0)
  582                         cru2x(inp->inp_cred, &xuc);
  583                 INP_RUNLOCK(inp);
  584         } else
  585                 error = ENOENT;
  586         if (error == 0)
  587                 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
  588         return (error);
  589 }
  590 
  591 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0,
  592     0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection");
  593 
  594 static int
  595 udp6_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr6,
  596     struct mbuf *control, struct thread *td)
  597 {
  598         u_int32_t ulen = m->m_pkthdr.len;
  599         u_int32_t plen = sizeof(struct udphdr) + ulen;
  600         struct ip6_hdr *ip6;
  601         struct udphdr *udp6;
  602         struct in6_addr *laddr, *faddr, in6a;
  603         struct sockaddr_in6 *sin6 = NULL;
  604         struct ifnet *oifp = NULL;
  605         int scope_ambiguous = 0;
  606         u_short fport;
  607         int error = 0;
  608         struct ip6_pktopts *optp, opt;
  609         int af = AF_INET6, hlen = sizeof(struct ip6_hdr);
  610         int flags;
  611         struct sockaddr_in6 tmp;
  612 
  613         INP_WLOCK_ASSERT(inp);
  614         INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
  615 
  616         if (addr6) {
  617                 /* addr6 has been validated in udp6_send(). */
  618                 sin6 = (struct sockaddr_in6 *)addr6;
  619 
  620                 /* protect *sin6 from overwrites */
  621                 tmp = *sin6;
  622                 sin6 = &tmp;
  623 
  624                 /*
  625                  * Application should provide a proper zone ID or the use of
  626                  * default zone IDs should be enabled.  Unfortunately, some
  627                  * applications do not behave as it should, so we need a
  628                  * workaround.  Even if an appropriate ID is not determined,
  629                  * we'll see if we can determine the outgoing interface.  If we
  630                  * can, determine the zone ID based on the interface below.
  631                  */
  632                 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone)
  633                         scope_ambiguous = 1;
  634                 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
  635                         return (error);
  636         }
  637 
  638         if (control) {
  639                 if ((error = ip6_setpktopts(control, &opt,
  640                     inp->in6p_outputopts, td->td_ucred, IPPROTO_UDP)) != 0)
  641                         goto release;
  642                 optp = &opt;
  643         } else
  644                 optp = inp->in6p_outputopts;
  645 
  646         if (sin6) {
  647                 faddr = &sin6->sin6_addr;
  648 
  649                 /*
  650                  * Since we saw no essential reason for calling in_pcbconnect,
  651                  * we get rid of such kind of logic, and call in6_selectsrc
  652                  * and in6_pcbsetport in order to fill in the local address
  653                  * and the local port.
  654                  */
  655                 if (sin6->sin6_port == 0) {
  656                         error = EADDRNOTAVAIL;
  657                         goto release;
  658                 }
  659 
  660                 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
  661                         /* how about ::ffff:0.0.0.0 case? */
  662                         error = EISCONN;
  663                         goto release;
  664                 }
  665 
  666                 fport = sin6->sin6_port; /* allow 0 port */
  667 
  668                 if (IN6_IS_ADDR_V4MAPPED(faddr)) {
  669                         if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) {
  670                                 /*
  671                                  * I believe we should explicitly discard the
  672                                  * packet when mapped addresses are disabled,
  673                                  * rather than send the packet as an IPv6 one.
  674                                  * If we chose the latter approach, the packet
  675                                  * might be sent out on the wire based on the
  676                                  * default route, the situation which we'd
  677                                  * probably want to avoid.
  678                                  * (20010421 jinmei@kame.net)
  679                                  */
  680                                 error = EINVAL;
  681                                 goto release;
  682                         }
  683                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
  684                             !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) {
  685                                 /*
  686                                  * when remote addr is an IPv4-mapped address,
  687                                  * local addr should not be an IPv6 address,
  688                                  * since you cannot determine how to map IPv6
  689                                  * source address to IPv4.
  690                                  */
  691                                 error = EINVAL;
  692                                 goto release;
  693                         }
  694 
  695                         af = AF_INET;
  696                 }
  697 
  698                 if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
  699                         error = in6_selectsrc(sin6, optp, inp, NULL,
  700                             td->td_ucred, &oifp, &in6a);
  701                         if (error)
  702                                 goto release;
  703                         if (oifp && scope_ambiguous &&
  704                             (error = in6_setscope(&sin6->sin6_addr,
  705                             oifp, NULL))) {
  706                                 goto release;
  707                         }
  708                         laddr = &in6a;
  709                 } else
  710                         laddr = &inp->in6p_laddr;       /* XXX */
  711                 if (laddr == NULL) {
  712                         if (error == 0)
  713                                 error = EADDRNOTAVAIL;
  714                         goto release;
  715                 }
  716                 if (inp->inp_lport == 0 &&
  717                     (error = in6_pcbsetport(laddr, inp, td->td_ucred)) != 0) {
  718                         /* Undo an address bind that may have occurred. */
  719                         inp->in6p_laddr = in6addr_any;
  720                         goto release;
  721                 }
  722         } else {
  723                 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
  724                         error = ENOTCONN;
  725                         goto release;
  726                 }
  727                 if (IN6_IS_ADDR_V4MAPPED(&inp->in6p_faddr)) {
  728                         if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) {
  729                                 /*
  730                                  * XXX: this case would happen when the
  731                                  * application sets the V6ONLY flag after
  732                                  * connecting the foreign address.
  733                                  * Such applications should be fixed,
  734                                  * so we bark here.
  735                                  */
  736                                 log(LOG_INFO, "udp6_output: IPV6_V6ONLY "
  737                                     "option was set for a connected socket\n");
  738                                 error = EINVAL;
  739                                 goto release;
  740                         } else
  741                                 af = AF_INET;
  742                 }
  743                 laddr = &inp->in6p_laddr;
  744                 faddr = &inp->in6p_faddr;
  745                 fport = inp->inp_fport;
  746         }
  747 
  748         if (af == AF_INET)
  749                 hlen = sizeof(struct ip);
  750 
  751         /*
  752          * Calculate data length and get a mbuf
  753          * for UDP and IP6 headers.
  754          */
  755         M_PREPEND(m, hlen + sizeof(struct udphdr), M_NOWAIT);
  756         if (m == 0) {
  757                 error = ENOBUFS;
  758                 goto release;
  759         }
  760 
  761         /*
  762          * Stuff checksum and output datagram.
  763          */
  764         udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
  765         udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */
  766         udp6->uh_dport = fport;
  767         if (plen <= 0xffff)
  768                 udp6->uh_ulen = htons((u_short)plen);
  769         else
  770                 udp6->uh_ulen = 0;
  771         udp6->uh_sum = 0;
  772 
  773         switch (af) {
  774         case AF_INET6:
  775                 ip6 = mtod(m, struct ip6_hdr *);
  776                 ip6->ip6_flow   = inp->inp_flow & IPV6_FLOWINFO_MASK;
  777                 ip6->ip6_vfc    &= ~IPV6_VERSION_MASK;
  778                 ip6->ip6_vfc    |= IPV6_VERSION;
  779                 ip6->ip6_plen   = htons((u_short)plen);
  780                 ip6->ip6_nxt    = IPPROTO_UDP;
  781                 ip6->ip6_hlim   = in6_selecthlim(inp, NULL);
  782                 ip6->ip6_src    = *laddr;
  783                 ip6->ip6_dst    = *faddr;
  784 
  785                 udp6->uh_sum = in6_cksum_pseudo(ip6, plen, IPPROTO_UDP, 0);
  786                 m->m_pkthdr.csum_flags = CSUM_UDP_IPV6;
  787                 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
  788 
  789                 flags = 0;
  790 
  791                 UDP_PROBE(send, NULL, inp, ip6, inp, udp6);
  792                 UDPSTAT_INC(udps_opackets);
  793                 error = ip6_output(m, optp, NULL, flags, inp->in6p_moptions,
  794                     NULL, inp);
  795                 break;
  796         case AF_INET:
  797                 error = EAFNOSUPPORT;
  798                 goto release;
  799         }
  800         goto releaseopt;
  801 
  802 release:
  803         m_freem(m);
  804 
  805 releaseopt:
  806         if (control) {
  807                 ip6_clearpktopts(&opt, -1);
  808                 m_freem(control);
  809         }
  810         return (error);
  811 }
  812 
  813 static void
  814 udp6_abort(struct socket *so)
  815 {
  816         struct inpcb *inp;
  817 
  818         inp = sotoinpcb(so);
  819         KASSERT(inp != NULL, ("udp6_abort: inp == NULL"));
  820 
  821 #ifdef INET
  822         if (inp->inp_vflag & INP_IPV4) {
  823                 struct pr_usrreqs *pru;
  824 
  825                 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
  826                 (*pru->pru_abort)(so);
  827                 return;
  828         }
  829 #endif
  830 
  831         INP_WLOCK(inp);
  832         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
  833                 INP_HASH_WLOCK(&V_udbinfo);
  834                 in6_pcbdisconnect(inp);
  835                 inp->in6p_laddr = in6addr_any;
  836                 INP_HASH_WUNLOCK(&V_udbinfo);
  837                 soisdisconnected(so);
  838         }
  839         INP_WUNLOCK(inp);
  840 }
  841 
  842 static int
  843 udp6_attach(struct socket *so, int proto, struct thread *td)
  844 {
  845         struct inpcb *inp;
  846         int error;
  847 
  848         inp = sotoinpcb(so);
  849         KASSERT(inp == NULL, ("udp6_attach: inp != NULL"));
  850 
  851         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
  852                 error = soreserve(so, udp_sendspace, udp_recvspace);
  853                 if (error)
  854                         return (error);
  855         }
  856         INP_INFO_WLOCK(&V_udbinfo);
  857         error = in_pcballoc(so, &V_udbinfo);
  858         if (error) {
  859                 INP_INFO_WUNLOCK(&V_udbinfo);
  860                 return (error);
  861         }
  862         inp = (struct inpcb *)so->so_pcb;
  863         inp->inp_vflag |= INP_IPV6;
  864         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
  865                 inp->inp_vflag |= INP_IPV4;
  866         inp->in6p_hops = -1;    /* use kernel default */
  867         inp->in6p_cksum = -1;   /* just to be sure */
  868         /*
  869          * XXX: ugly!!
  870          * IPv4 TTL initialization is necessary for an IPv6 socket as well,
  871          * because the socket may be bound to an IPv6 wildcard address,
  872          * which may match an IPv4-mapped IPv6 address.
  873          */
  874         inp->inp_ip_ttl = V_ip_defttl;
  875 
  876         error = udp_newudpcb(inp);
  877         if (error) {
  878                 in_pcbdetach(inp);
  879                 in_pcbfree(inp);
  880                 INP_INFO_WUNLOCK(&V_udbinfo);
  881                 return (error);
  882         }
  883         INP_WUNLOCK(inp);
  884         INP_INFO_WUNLOCK(&V_udbinfo);
  885         return (0);
  886 }
  887 
  888 static int
  889 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
  890 {
  891         struct inpcb *inp;
  892         int error;
  893 
  894         inp = sotoinpcb(so);
  895         KASSERT(inp != NULL, ("udp6_bind: inp == NULL"));
  896 
  897         INP_WLOCK(inp);
  898         INP_HASH_WLOCK(&V_udbinfo);
  899         inp->inp_vflag &= ~INP_IPV4;
  900         inp->inp_vflag |= INP_IPV6;
  901         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
  902                 struct sockaddr_in6 *sin6_p;
  903 
  904                 sin6_p = (struct sockaddr_in6 *)nam;
  905 
  906                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
  907                         inp->inp_vflag |= INP_IPV4;
  908 #ifdef INET
  909                 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
  910                         struct sockaddr_in sin;
  911 
  912                         in6_sin6_2_sin(&sin, sin6_p);
  913                         inp->inp_vflag |= INP_IPV4;
  914                         inp->inp_vflag &= ~INP_IPV6;
  915                         error = in_pcbbind(inp, (struct sockaddr *)&sin,
  916                             td->td_ucred);
  917                         goto out;
  918                 }
  919 #endif
  920         }
  921 
  922         error = in6_pcbbind(inp, nam, td->td_ucred);
  923 #ifdef INET
  924 out:
  925 #endif
  926         INP_HASH_WUNLOCK(&V_udbinfo);
  927         INP_WUNLOCK(inp);
  928         return (error);
  929 }
  930 
  931 static void
  932 udp6_close(struct socket *so)
  933 {
  934         struct inpcb *inp;
  935 
  936         inp = sotoinpcb(so);
  937         KASSERT(inp != NULL, ("udp6_close: inp == NULL"));
  938 
  939 #ifdef INET
  940         if (inp->inp_vflag & INP_IPV4) {
  941                 struct pr_usrreqs *pru;
  942 
  943                 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
  944                 (*pru->pru_disconnect)(so);
  945                 return;
  946         }
  947 #endif
  948         INP_WLOCK(inp);
  949         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
  950                 INP_HASH_WLOCK(&V_udbinfo);
  951                 in6_pcbdisconnect(inp);
  952                 inp->in6p_laddr = in6addr_any;
  953                 INP_HASH_WUNLOCK(&V_udbinfo);
  954                 soisdisconnected(so);
  955         }
  956         INP_WUNLOCK(inp);
  957 }
  958 
  959 static int
  960 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
  961 {
  962         struct inpcb *inp;
  963         struct sockaddr_in6 *sin6;
  964         int error;
  965 
  966         inp = sotoinpcb(so);
  967         sin6 = (struct sockaddr_in6 *)nam;
  968         KASSERT(inp != NULL, ("udp6_connect: inp == NULL"));
  969 
  970         /*
  971          * XXXRW: Need to clarify locking of v4/v6 flags.
  972          */
  973         INP_WLOCK(inp);
  974 #ifdef INET
  975         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
  976                 struct sockaddr_in sin;
  977 
  978                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
  979                         error = EINVAL;
  980                         goto out;
  981                 }
  982                 if (inp->inp_faddr.s_addr != INADDR_ANY) {
  983                         error = EISCONN;
  984                         goto out;
  985                 }
  986                 in6_sin6_2_sin(&sin, sin6);
  987                 inp->inp_vflag |= INP_IPV4;
  988                 inp->inp_vflag &= ~INP_IPV6;
  989                 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr);
  990                 if (error != 0)
  991                         goto out;
  992                 INP_HASH_WLOCK(&V_udbinfo);
  993                 error = in_pcbconnect(inp, (struct sockaddr *)&sin,
  994                     td->td_ucred);
  995                 INP_HASH_WUNLOCK(&V_udbinfo);
  996                 if (error == 0)
  997                         soisconnected(so);
  998                 goto out;
  999         }
 1000 #endif
 1001         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 1002                 error = EISCONN;
 1003                 goto out;
 1004         }
 1005         inp->inp_vflag &= ~INP_IPV4;
 1006         inp->inp_vflag |= INP_IPV6;
 1007         error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr);
 1008         if (error != 0)
 1009                 goto out;
 1010         INP_HASH_WLOCK(&V_udbinfo);
 1011         error = in6_pcbconnect(inp, nam, td->td_ucred);
 1012         INP_HASH_WUNLOCK(&V_udbinfo);
 1013         if (error == 0)
 1014                 soisconnected(so);
 1015 out:
 1016         INP_WUNLOCK(inp);
 1017         return (error);
 1018 }
 1019 
 1020 static void
 1021 udp6_detach(struct socket *so)
 1022 {
 1023         struct inpcb *inp;
 1024         struct udpcb *up;
 1025 
 1026         inp = sotoinpcb(so);
 1027         KASSERT(inp != NULL, ("udp6_detach: inp == NULL"));
 1028 
 1029         INP_INFO_WLOCK(&V_udbinfo);
 1030         INP_WLOCK(inp);
 1031         up = intoudpcb(inp);
 1032         KASSERT(up != NULL, ("%s: up == NULL", __func__));
 1033         in_pcbdetach(inp);
 1034         in_pcbfree(inp);
 1035         INP_INFO_WUNLOCK(&V_udbinfo);
 1036         udp_discardcb(up);
 1037 }
 1038 
 1039 static int
 1040 udp6_disconnect(struct socket *so)
 1041 {
 1042         struct inpcb *inp;
 1043         int error;
 1044 
 1045         inp = sotoinpcb(so);
 1046         KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL"));
 1047 
 1048 #ifdef INET
 1049         if (inp->inp_vflag & INP_IPV4) {
 1050                 struct pr_usrreqs *pru;
 1051 
 1052                 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
 1053                 (void)(*pru->pru_disconnect)(so);
 1054                 return (0);
 1055         }
 1056 #endif
 1057 
 1058         INP_WLOCK(inp);
 1059 
 1060         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 1061                 error = ENOTCONN;
 1062                 goto out;
 1063         }
 1064 
 1065         INP_HASH_WLOCK(&V_udbinfo);
 1066         in6_pcbdisconnect(inp);
 1067         inp->in6p_laddr = in6addr_any;
 1068         INP_HASH_WUNLOCK(&V_udbinfo);
 1069         SOCK_LOCK(so);
 1070         so->so_state &= ~SS_ISCONNECTED;                /* XXX */
 1071         SOCK_UNLOCK(so);
 1072 out:
 1073         INP_WUNLOCK(inp);
 1074         return (0);
 1075 }
 1076 
 1077 static int
 1078 udp6_send(struct socket *so, int flags, struct mbuf *m,
 1079     struct sockaddr *addr, struct mbuf *control, struct thread *td)
 1080 {
 1081         struct inpcb *inp;
 1082         int error = 0;
 1083 
 1084         inp = sotoinpcb(so);
 1085         KASSERT(inp != NULL, ("udp6_send: inp == NULL"));
 1086 
 1087         INP_WLOCK(inp);
 1088         if (addr) {
 1089                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 1090                         error = EINVAL;
 1091                         goto bad;
 1092                 }
 1093                 if (addr->sa_family != AF_INET6) {
 1094                         error = EAFNOSUPPORT;
 1095                         goto bad;
 1096                 }
 1097         }
 1098 
 1099 #ifdef INET
 1100         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
 1101                 int hasv4addr;
 1102                 struct sockaddr_in6 *sin6 = 0;
 1103 
 1104                 if (addr == 0)
 1105                         hasv4addr = (inp->inp_vflag & INP_IPV4);
 1106                 else {
 1107                         sin6 = (struct sockaddr_in6 *)addr;
 1108                         hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
 1109                             ? 1 : 0;
 1110                 }
 1111                 if (hasv4addr) {
 1112                         struct pr_usrreqs *pru;
 1113 
 1114                         /*
 1115                          * XXXRW: We release UDP-layer locks before calling
 1116                          * udp_send() in order to avoid recursion.  However,
 1117                          * this does mean there is a short window where inp's
 1118                          * fields are unstable.  Could this lead to a
 1119                          * potential race in which the factors causing us to
 1120                          * select the UDPv4 output routine are invalidated?
 1121                          */
 1122                         INP_WUNLOCK(inp);
 1123                         if (sin6)
 1124                                 in6_sin6_2_sin_in_sock(addr);
 1125                         pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
 1126                         /* addr will just be freed in sendit(). */
 1127                         return ((*pru->pru_send)(so, flags, m, addr, control,
 1128                             td));
 1129                 }
 1130         }
 1131 #endif
 1132 #ifdef MAC
 1133         mac_inpcb_create_mbuf(inp, m);
 1134 #endif
 1135         INP_HASH_WLOCK(&V_udbinfo);
 1136         error = udp6_output(inp, m, addr, control, td);
 1137         INP_HASH_WUNLOCK(&V_udbinfo);
 1138 #ifdef INET
 1139 #endif  
 1140         INP_WUNLOCK(inp);
 1141         return (error);
 1142 
 1143 bad:
 1144         INP_WUNLOCK(inp);
 1145         m_freem(m);
 1146         return (error);
 1147 }
 1148 
 1149 struct pr_usrreqs udp6_usrreqs = {
 1150         .pru_abort =            udp6_abort,
 1151         .pru_attach =           udp6_attach,
 1152         .pru_bind =             udp6_bind,
 1153         .pru_connect =          udp6_connect,
 1154         .pru_control =          in6_control,
 1155         .pru_detach =           udp6_detach,
 1156         .pru_disconnect =       udp6_disconnect,
 1157         .pru_peeraddr =         in6_mapped_peeraddr,
 1158         .pru_send =             udp6_send,
 1159         .pru_shutdown =         udp_shutdown,
 1160         .pru_sockaddr =         in6_mapped_sockaddr,
 1161         .pru_soreceive =        soreceive_dgram,
 1162         .pru_sosend =           sosend_dgram,
 1163         .pru_sosetlabel =       in_pcbsosetlabel,
 1164         .pru_close =            udp6_close
 1165 };

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