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/9.0/sys/netinet6/udp6_usrreq.c 225044 2011-08-20 17:05:11Z bz $");
   71 
   72 #include "opt_inet.h"
   73 #include "opt_inet6.h"
   74 #include "opt_ipfw.h"
   75 #include "opt_ipsec.h"
   76 
   77 #include <sys/param.h>
   78 #include <sys/jail.h>
   79 #include <sys/kernel.h>
   80 #include <sys/lock.h>
   81 #include <sys/mbuf.h>
   82 #include <sys/priv.h>
   83 #include <sys/proc.h>
   84 #include <sys/protosw.h>
   85 #include <sys/signalvar.h>
   86 #include <sys/socket.h>
   87 #include <sys/socketvar.h>
   88 #include <sys/sx.h>
   89 #include <sys/sysctl.h>
   90 #include <sys/syslog.h>
   91 #include <sys/systm.h>
   92 
   93 #include <net/if.h>
   94 #include <net/if_types.h>
   95 #include <net/route.h>
   96 
   97 #include <netinet/in.h>
   98 #include <netinet/in_pcb.h>
   99 #include <netinet/in_systm.h>
  100 #include <netinet/in_var.h>
  101 #include <netinet/ip.h>
  102 #include <netinet/ip_icmp.h>
  103 #include <netinet/ip6.h>
  104 #include <netinet/icmp_var.h>
  105 #include <netinet/icmp6.h>
  106 #include <netinet/ip_var.h>
  107 #include <netinet/udp.h>
  108 #include <netinet/udp_var.h>
  109 
  110 #include <netinet6/ip6protosw.h>
  111 #include <netinet6/ip6_var.h>
  112 #include <netinet6/in6_pcb.h>
  113 #include <netinet6/udp6_var.h>
  114 #include <netinet6/scope6_var.h>
  115 
  116 #ifdef IPSEC
  117 #include <netipsec/ipsec.h>
  118 #include <netipsec/ipsec6.h>
  119 #endif /* IPSEC */
  120 
  121 #include <security/mac/mac_framework.h>
  122 
  123 /*
  124  * UDP protocol implementation.
  125  * Per RFC 768, August, 1980.
  126  */
  127 
  128 extern struct protosw   inetsw[];
  129 static void             udp6_detach(struct socket *so);
  130 
  131 static void
  132 udp6_append(struct inpcb *inp, struct mbuf *n, int off,
  133     struct sockaddr_in6 *fromsa)
  134 {
  135         struct socket *so;
  136         struct mbuf *opts;
  137 
  138         INP_LOCK_ASSERT(inp);
  139 
  140 #ifdef IPSEC
  141         /* Check AH/ESP integrity. */
  142         if (ipsec6_in_reject(n, inp)) {
  143                 m_freem(n);
  144                 V_ipsec6stat.in_polvio++;
  145                 return;
  146         }
  147 #endif /* IPSEC */
  148 #ifdef MAC
  149         if (mac_inpcb_check_deliver(inp, n) != 0) {
  150                 m_freem(n);
  151                 return;
  152         }
  153 #endif
  154         opts = NULL;
  155         if (inp->inp_flags & INP_CONTROLOPTS ||
  156             inp->inp_socket->so_options & SO_TIMESTAMP)
  157                 ip6_savecontrol(inp, n, &opts);
  158         m_adj(n, off + sizeof(struct udphdr));
  159 
  160         so = inp->inp_socket;
  161         SOCKBUF_LOCK(&so->so_rcv);
  162         if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)fromsa, n,
  163             opts) == 0) {
  164                 SOCKBUF_UNLOCK(&so->so_rcv);
  165                 m_freem(n);
  166                 if (opts)
  167                         m_freem(opts);
  168                 UDPSTAT_INC(udps_fullsock);
  169         } else
  170                 sorwakeup_locked(so);
  171 }
  172 
  173 int
  174 udp6_input(struct mbuf **mp, int *offp, int proto)
  175 {
  176         struct mbuf *m = *mp;
  177         struct ifnet *ifp;
  178         struct ip6_hdr *ip6;
  179         struct udphdr *uh;
  180         struct inpcb *inp;
  181         struct udpcb *up;
  182         int off = *offp;
  183         int plen, ulen;
  184         struct sockaddr_in6 fromsa;
  185 #ifdef IPFIREWALL_FORWARD
  186         struct m_tag *fwd_tag;
  187 #endif
  188 
  189         ifp = m->m_pkthdr.rcvif;
  190         ip6 = mtod(m, struct ip6_hdr *);
  191 
  192         if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
  193                 /* XXX send icmp6 host/port unreach? */
  194                 m_freem(m);
  195                 return (IPPROTO_DONE);
  196         }
  197 
  198 #ifndef PULLDOWN_TEST
  199         IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
  200         ip6 = mtod(m, struct ip6_hdr *);
  201         uh = (struct udphdr *)((caddr_t)ip6 + off);
  202 #else
  203         IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh));
  204         if (!uh)
  205                 return (IPPROTO_DONE);
  206 #endif
  207 
  208         UDPSTAT_INC(udps_ipackets);
  209 
  210         /*
  211          * Destination port of 0 is illegal, based on RFC768.
  212          */
  213         if (uh->uh_dport == 0)
  214                 goto badunlocked;
  215 
  216         plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
  217         ulen = ntohs((u_short)uh->uh_ulen);
  218 
  219         if (plen != ulen) {
  220                 UDPSTAT_INC(udps_badlen);
  221                 goto badunlocked;
  222         }
  223 
  224         /*
  225          * Checksum extended UDP header and data.
  226          */
  227         if (uh->uh_sum == 0) {
  228                 UDPSTAT_INC(udps_nosum);
  229                 goto badunlocked;
  230         }
  231         if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
  232                 UDPSTAT_INC(udps_badsum);
  233                 goto badunlocked;
  234         }
  235 
  236         /*
  237          * Construct sockaddr format source address.
  238          */
  239         init_sin6(&fromsa, m);
  240         fromsa.sin6_port = uh->uh_sport;
  241 
  242         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
  243                 struct inpcb *last;
  244                 struct ip6_moptions *imo;
  245 
  246                 INP_INFO_RLOCK(&V_udbinfo);
  247                 /*
  248                  * In the event that laddr should be set to the link-local
  249                  * address (this happens in RIPng), the multicast address
  250                  * specified in the received packet will not match laddr.  To
  251                  * handle this situation, matching is relaxed if the
  252                  * receiving interface is the same as one specified in the
  253                  * socket and if the destination multicast address matches
  254                  * one of the multicast groups specified in the socket.
  255                  */
  256 
  257                 /*
  258                  * KAME note: traditionally we dropped udpiphdr from mbuf
  259                  * here.  We need udphdr for IPsec processing so we do that
  260                  * later.
  261                  */
  262                 last = NULL;
  263                 LIST_FOREACH(inp, &V_udb, inp_list) {
  264                         if ((inp->inp_vflag & INP_IPV6) == 0)
  265                                 continue;
  266                         if (inp->inp_lport != uh->uh_dport)
  267                                 continue;
  268                         if (inp->inp_fport != 0 &&
  269                             inp->inp_fport != uh->uh_sport)
  270                                 continue;
  271                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
  272                                 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
  273                                                         &ip6->ip6_dst))
  274                                         continue;
  275                         }
  276                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
  277                                 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
  278                                                         &ip6->ip6_src) ||
  279                                     inp->inp_fport != uh->uh_sport)
  280                                         continue;
  281                         }
  282 
  283                         /*
  284                          * XXXRW: Because we weren't holding either the inpcb
  285                          * or the hash lock when we checked for a match 
  286                          * before, we should probably recheck now that the 
  287                          * inpcb lock is (supposed to be) held.
  288                          */
  289 
  290                         /*
  291                          * Handle socket delivery policy for any-source
  292                          * and source-specific multicast. [RFC3678]
  293                          */
  294                         imo = inp->in6p_moptions;
  295                         if (imo && IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
  296                                 struct sockaddr_in6      mcaddr;
  297                                 int                      blocked;
  298 
  299                                 INP_RLOCK(inp);
  300 
  301                                 bzero(&mcaddr, sizeof(struct sockaddr_in6));
  302                                 mcaddr.sin6_len = sizeof(struct sockaddr_in6);
  303                                 mcaddr.sin6_family = AF_INET6;
  304                                 mcaddr.sin6_addr = ip6->ip6_dst;
  305 
  306                                 blocked = im6o_mc_filter(imo, ifp,
  307                                         (struct sockaddr *)&mcaddr,
  308                                         (struct sockaddr *)&fromsa);
  309                                 if (blocked != MCAST_PASS) {
  310                                         if (blocked == MCAST_NOTGMEMBER)
  311                                                 IP6STAT_INC(ip6s_notmember);
  312                                         if (blocked == MCAST_NOTSMEMBER ||
  313                                             blocked == MCAST_MUTED)
  314                                                 UDPSTAT_INC(udps_filtermcast);
  315                                         INP_RUNLOCK(inp); /* XXX */
  316                                         continue;
  317                                 }
  318 
  319                                 INP_RUNLOCK(inp);
  320                         }
  321                         if (last != NULL) {
  322                                 struct mbuf *n;
  323 
  324                                 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
  325                                         INP_RLOCK(last);
  326                                         up = intoudpcb(last);
  327                                         if (up->u_tun_func == NULL) {
  328                                                 udp6_append(last, n, off, &fromsa);
  329                                         } else {
  330                                                 /*
  331                                                  * Engage the tunneling
  332                                                  * protocol we will have to
  333                                                  * leave the info_lock up,
  334                                                  * since we are hunting
  335                                                  * through multiple UDP's.
  336                                                  * 
  337                                                  */
  338                                                 (*up->u_tun_func)(n, off, last);
  339                                         }
  340                                         INP_RUNLOCK(last);
  341                                 }
  342                         }
  343                         last = inp;
  344                         /*
  345                          * Don't look for additional matches if this one does
  346                          * not have either the SO_REUSEPORT or SO_REUSEADDR
  347                          * socket options set.  This heuristic avoids
  348                          * searching through all pcbs in the common case of a
  349                          * non-shared port.  It assumes that an application
  350                          * will never clear these options after setting them.
  351                          */
  352                         if ((last->inp_socket->so_options &
  353                              (SO_REUSEPORT|SO_REUSEADDR)) == 0)
  354                                 break;
  355                 }
  356 
  357                 if (last == NULL) {
  358                         /*
  359                          * No matching pcb found; discard datagram.  (No need
  360                          * to send an ICMP Port Unreachable for a broadcast
  361                          * or multicast datgram.)
  362                          */
  363                         UDPSTAT_INC(udps_noport);
  364                         UDPSTAT_INC(udps_noportmcast);
  365                         goto badheadlocked;
  366                 }
  367                 INP_RLOCK(last);
  368                 INP_INFO_RUNLOCK(&V_udbinfo);
  369                 up = intoudpcb(last);
  370                 if (up->u_tun_func == NULL) {
  371                         udp6_append(last, m, off, &fromsa);
  372                 } else {
  373                         /*
  374                          * Engage the tunneling protocol.
  375                          */
  376                         (*up->u_tun_func)(m, off, last);
  377                 }
  378                 INP_RUNLOCK(last);
  379                 return (IPPROTO_DONE);
  380         }
  381         /*
  382          * Locate pcb for datagram.
  383          */
  384 #ifdef IPFIREWALL_FORWARD
  385         /*
  386          * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain.
  387          */
  388         fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL);
  389         if (fwd_tag != NULL) {
  390                 struct sockaddr_in6 *next_hop6;
  391 
  392                 next_hop6 = (struct sockaddr_in6 *)(fwd_tag + 1);
  393 
  394                 /*
  395                  * Transparently forwarded. Pretend to be the destination.
  396                  * Already got one like this?
  397                  */
  398                 inp = in6_pcblookup_mbuf(&V_udbinfo,
  399                     &ip6->ip6_src, uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
  400                     INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif, m);
  401                 if (!inp) {
  402                         /*
  403                          * It's new.  Try to find the ambushing socket.
  404                          * Because we've rewritten the destination address,
  405                          * any hardware-generated hash is ignored.
  406                          */
  407                         inp = in6_pcblookup(&V_udbinfo, &ip6->ip6_src,
  408                             uh->uh_sport, &next_hop6->sin6_addr,
  409                             next_hop6->sin6_port ? htons(next_hop6->sin6_port) :
  410                             uh->uh_dport, INPLOOKUP_WILDCARD |
  411                             INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif);
  412                 }
  413                 /* Remove the tag from the packet. We don't need it anymore. */
  414                 m_tag_delete(m, fwd_tag);
  415         } else
  416 #endif /* IPFIREWALL_FORWARD */
  417                 inp = in6_pcblookup_mbuf(&V_udbinfo, &ip6->ip6_src,
  418                     uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
  419                     INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB,
  420                     m->m_pkthdr.rcvif, m);
  421         if (inp == NULL) {
  422                 if (udp_log_in_vain) {
  423                         char ip6bufs[INET6_ADDRSTRLEN];
  424                         char ip6bufd[INET6_ADDRSTRLEN];
  425 
  426                         log(LOG_INFO,
  427                             "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
  428                             ip6_sprintf(ip6bufd, &ip6->ip6_dst),
  429                             ntohs(uh->uh_dport),
  430                             ip6_sprintf(ip6bufs, &ip6->ip6_src),
  431                             ntohs(uh->uh_sport));
  432                 }
  433                 UDPSTAT_INC(udps_noport);
  434                 if (m->m_flags & M_MCAST) {
  435                         printf("UDP6: M_MCAST is set in a unicast packet.\n");
  436                         UDPSTAT_INC(udps_noportmcast);
  437                         goto badunlocked;
  438                 }
  439                 if (V_udp_blackhole)
  440                         goto badunlocked;
  441                 if (badport_bandlim(BANDLIM_ICMP6_UNREACH) < 0)
  442                         goto badunlocked;
  443                 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
  444                 return (IPPROTO_DONE);
  445         }
  446         INP_RLOCK_ASSERT(inp);
  447         up = intoudpcb(inp);
  448         if (up->u_tun_func == NULL) {
  449                 udp6_append(inp, m, off, &fromsa);
  450         } else {
  451                 /*
  452                  * Engage the tunneling protocol.
  453                  */
  454 
  455                 (*up->u_tun_func)(m, off, inp);
  456         }
  457         INP_RUNLOCK(inp);
  458         return (IPPROTO_DONE);
  459 
  460 badheadlocked:
  461         INP_INFO_RUNLOCK(&V_udbinfo);
  462 badunlocked:
  463         if (m)
  464                 m_freem(m);
  465         return (IPPROTO_DONE);
  466 }
  467 
  468 void
  469 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d)
  470 {
  471         struct udphdr uh;
  472         struct ip6_hdr *ip6;
  473         struct mbuf *m;
  474         int off = 0;
  475         struct ip6ctlparam *ip6cp = NULL;
  476         const struct sockaddr_in6 *sa6_src = NULL;
  477         void *cmdarg;
  478         struct inpcb *(*notify)(struct inpcb *, int) = udp_notify;
  479         struct udp_portonly {
  480                 u_int16_t uh_sport;
  481                 u_int16_t uh_dport;
  482         } *uhp;
  483 
  484         if (sa->sa_family != AF_INET6 ||
  485             sa->sa_len != sizeof(struct sockaddr_in6))
  486                 return;
  487 
  488         if ((unsigned)cmd >= PRC_NCMDS)
  489                 return;
  490         if (PRC_IS_REDIRECT(cmd))
  491                 notify = in6_rtchange, d = NULL;
  492         else if (cmd == PRC_HOSTDEAD)
  493                 d = NULL;
  494         else if (inet6ctlerrmap[cmd] == 0)
  495                 return;
  496 
  497         /* if the parameter is from icmp6, decode it. */
  498         if (d != NULL) {
  499                 ip6cp = (struct ip6ctlparam *)d;
  500                 m = ip6cp->ip6c_m;
  501                 ip6 = ip6cp->ip6c_ip6;
  502                 off = ip6cp->ip6c_off;
  503                 cmdarg = ip6cp->ip6c_cmdarg;
  504                 sa6_src = ip6cp->ip6c_src;
  505         } else {
  506                 m = NULL;
  507                 ip6 = NULL;
  508                 cmdarg = NULL;
  509                 sa6_src = &sa6_any;
  510         }
  511 
  512         if (ip6) {
  513                 /*
  514                  * XXX: We assume that when IPV6 is non NULL,
  515                  * M and OFF are valid.
  516                  */
  517 
  518                 /* Check if we can safely examine src and dst ports. */
  519                 if (m->m_pkthdr.len < off + sizeof(*uhp))
  520                         return;
  521 
  522                 bzero(&uh, sizeof(uh));
  523                 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
  524 
  525                 (void) in6_pcbnotify(&V_udbinfo, sa, uh.uh_dport,
  526                     (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd,
  527                     cmdarg, notify);
  528         } else
  529                 (void) in6_pcbnotify(&V_udbinfo, sa, 0,
  530                     (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
  531 }
  532 
  533 static int
  534 udp6_getcred(SYSCTL_HANDLER_ARGS)
  535 {
  536         struct xucred xuc;
  537         struct sockaddr_in6 addrs[2];
  538         struct inpcb *inp;
  539         int error;
  540 
  541         error = priv_check(req->td, PRIV_NETINET_GETCRED);
  542         if (error)
  543                 return (error);
  544 
  545         if (req->newlen != sizeof(addrs))
  546                 return (EINVAL);
  547         if (req->oldlen != sizeof(struct xucred))
  548                 return (EINVAL);
  549         error = SYSCTL_IN(req, addrs, sizeof(addrs));
  550         if (error)
  551                 return (error);
  552         if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 ||
  553             (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) {
  554                 return (error);
  555         }
  556         inp = in6_pcblookup(&V_udbinfo, &addrs[1].sin6_addr,
  557             addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port,
  558             INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
  559         if (inp != NULL) {
  560                 INP_RLOCK_ASSERT(inp);
  561                 if (inp->inp_socket == NULL)
  562                         error = ENOENT;
  563                 if (error == 0)
  564                         error = cr_canseesocket(req->td->td_ucred,
  565                             inp->inp_socket);
  566                 if (error == 0)
  567                         cru2x(inp->inp_cred, &xuc);
  568                 INP_RUNLOCK(inp);
  569         } else
  570                 error = ENOENT;
  571         if (error == 0)
  572                 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
  573         return (error);
  574 }
  575 
  576 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0,
  577     0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection");
  578 
  579 static int
  580 udp6_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr6,
  581     struct mbuf *control, struct thread *td)
  582 {
  583         u_int32_t ulen = m->m_pkthdr.len;
  584         u_int32_t plen = sizeof(struct udphdr) + ulen;
  585         struct ip6_hdr *ip6;
  586         struct udphdr *udp6;
  587         struct in6_addr *laddr, *faddr, in6a;
  588         struct sockaddr_in6 *sin6 = NULL;
  589         struct ifnet *oifp = NULL;
  590         int scope_ambiguous = 0;
  591         u_short fport;
  592         int error = 0;
  593         struct ip6_pktopts *optp, opt;
  594         int af = AF_INET6, hlen = sizeof(struct ip6_hdr);
  595         int flags;
  596         struct sockaddr_in6 tmp;
  597 
  598         INP_WLOCK_ASSERT(inp);
  599         INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
  600 
  601         if (addr6) {
  602                 /* addr6 has been validated in udp6_send(). */
  603                 sin6 = (struct sockaddr_in6 *)addr6;
  604 
  605                 /* protect *sin6 from overwrites */
  606                 tmp = *sin6;
  607                 sin6 = &tmp;
  608 
  609                 /*
  610                  * Application should provide a proper zone ID or the use of
  611                  * default zone IDs should be enabled.  Unfortunately, some
  612                  * applications do not behave as it should, so we need a
  613                  * workaround.  Even if an appropriate ID is not determined,
  614                  * we'll see if we can determine the outgoing interface.  If we
  615                  * can, determine the zone ID based on the interface below.
  616                  */
  617                 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone)
  618                         scope_ambiguous = 1;
  619                 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
  620                         return (error);
  621         }
  622 
  623         if (control) {
  624                 if ((error = ip6_setpktopts(control, &opt,
  625                     inp->in6p_outputopts, td->td_ucred, IPPROTO_UDP)) != 0)
  626                         goto release;
  627                 optp = &opt;
  628         } else
  629                 optp = inp->in6p_outputopts;
  630 
  631         if (sin6) {
  632                 faddr = &sin6->sin6_addr;
  633 
  634                 /*
  635                  * IPv4 version of udp_output calls in_pcbconnect in this case,
  636                  * which needs splnet and affects performance.
  637                  * Since we saw no essential reason for calling in_pcbconnect,
  638                  * we get rid of such kind of logic, and call in6_selectsrc
  639                  * and in6_pcbsetport in order to fill in the local address
  640                  * and the local port.
  641                  */
  642                 if (sin6->sin6_port == 0) {
  643                         error = EADDRNOTAVAIL;
  644                         goto release;
  645                 }
  646 
  647                 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
  648                         /* how about ::ffff:0.0.0.0 case? */
  649                         error = EISCONN;
  650                         goto release;
  651                 }
  652 
  653                 fport = sin6->sin6_port; /* allow 0 port */
  654 
  655                 if (IN6_IS_ADDR_V4MAPPED(faddr)) {
  656                         if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) {
  657                                 /*
  658                                  * I believe we should explicitly discard the
  659                                  * packet when mapped addresses are disabled,
  660                                  * rather than send the packet as an IPv6 one.
  661                                  * If we chose the latter approach, the packet
  662                                  * might be sent out on the wire based on the
  663                                  * default route, the situation which we'd
  664                                  * probably want to avoid.
  665                                  * (20010421 jinmei@kame.net)
  666                                  */
  667                                 error = EINVAL;
  668                                 goto release;
  669                         }
  670                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
  671                             !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) {
  672                                 /*
  673                                  * when remote addr is an IPv4-mapped address,
  674                                  * local addr should not be an IPv6 address,
  675                                  * since you cannot determine how to map IPv6
  676                                  * source address to IPv4.
  677                                  */
  678                                 error = EINVAL;
  679                                 goto release;
  680                         }
  681 
  682                         af = AF_INET;
  683                 }
  684 
  685                 if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
  686                         error = in6_selectsrc(sin6, optp, inp, NULL,
  687                             td->td_ucred, &oifp, &in6a);
  688                         if (error)
  689                                 goto release;
  690                         if (oifp && scope_ambiguous &&
  691                             (error = in6_setscope(&sin6->sin6_addr,
  692                             oifp, NULL))) {
  693                                 goto release;
  694                         }
  695                         laddr = &in6a;
  696                 } else
  697                         laddr = &inp->in6p_laddr;       /* XXX */
  698                 if (laddr == NULL) {
  699                         if (error == 0)
  700                                 error = EADDRNOTAVAIL;
  701                         goto release;
  702                 }
  703                 if (inp->inp_lport == 0 &&
  704                     (error = in6_pcbsetport(laddr, inp, td->td_ucred)) != 0) {
  705                         /* Undo an address bind that may have occurred. */
  706                         inp->in6p_laddr = in6addr_any;
  707                         goto release;
  708                 }
  709         } else {
  710                 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
  711                         error = ENOTCONN;
  712                         goto release;
  713                 }
  714                 if (IN6_IS_ADDR_V4MAPPED(&inp->in6p_faddr)) {
  715                         if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) {
  716                                 /*
  717                                  * XXX: this case would happen when the
  718                                  * application sets the V6ONLY flag after
  719                                  * connecting the foreign address.
  720                                  * Such applications should be fixed,
  721                                  * so we bark here.
  722                                  */
  723                                 log(LOG_INFO, "udp6_output: IPV6_V6ONLY "
  724                                     "option was set for a connected socket\n");
  725                                 error = EINVAL;
  726                                 goto release;
  727                         } else
  728                                 af = AF_INET;
  729                 }
  730                 laddr = &inp->in6p_laddr;
  731                 faddr = &inp->in6p_faddr;
  732                 fport = inp->inp_fport;
  733         }
  734 
  735         if (af == AF_INET)
  736                 hlen = sizeof(struct ip);
  737 
  738         /*
  739          * Calculate data length and get a mbuf
  740          * for UDP and IP6 headers.
  741          */
  742         M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT);
  743         if (m == 0) {
  744                 error = ENOBUFS;
  745                 goto release;
  746         }
  747 
  748         /*
  749          * Stuff checksum and output datagram.
  750          */
  751         udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
  752         udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */
  753         udp6->uh_dport = fport;
  754         if (plen <= 0xffff)
  755                 udp6->uh_ulen = htons((u_short)plen);
  756         else
  757                 udp6->uh_ulen = 0;
  758         udp6->uh_sum = 0;
  759 
  760         switch (af) {
  761         case AF_INET6:
  762                 ip6 = mtod(m, struct ip6_hdr *);
  763                 ip6->ip6_flow   = inp->inp_flow & IPV6_FLOWINFO_MASK;
  764                 ip6->ip6_vfc    &= ~IPV6_VERSION_MASK;
  765                 ip6->ip6_vfc    |= IPV6_VERSION;
  766 #if 0                           /* ip6_plen will be filled in ip6_output. */
  767                 ip6->ip6_plen   = htons((u_short)plen);
  768 #endif
  769                 ip6->ip6_nxt    = IPPROTO_UDP;
  770                 ip6->ip6_hlim   = in6_selecthlim(inp, NULL);
  771                 ip6->ip6_src    = *laddr;
  772                 ip6->ip6_dst    = *faddr;
  773 
  774                 if ((udp6->uh_sum = in6_cksum(m, IPPROTO_UDP,
  775                                 sizeof(struct ip6_hdr), plen)) == 0) {
  776                         udp6->uh_sum = 0xffff;
  777                 }
  778 
  779                 flags = 0;
  780 
  781                 UDPSTAT_INC(udps_opackets);
  782                 error = ip6_output(m, optp, NULL, flags, inp->in6p_moptions,
  783                     NULL, inp);
  784                 break;
  785         case AF_INET:
  786                 error = EAFNOSUPPORT;
  787                 goto release;
  788         }
  789         goto releaseopt;
  790 
  791 release:
  792         m_freem(m);
  793 
  794 releaseopt:
  795         if (control) {
  796                 ip6_clearpktopts(&opt, -1);
  797                 m_freem(control);
  798         }
  799         return (error);
  800 }
  801 
  802 static void
  803 udp6_abort(struct socket *so)
  804 {
  805         struct inpcb *inp;
  806 
  807         inp = sotoinpcb(so);
  808         KASSERT(inp != NULL, ("udp6_abort: inp == NULL"));
  809 
  810 #ifdef INET
  811         if (inp->inp_vflag & INP_IPV4) {
  812                 struct pr_usrreqs *pru;
  813 
  814                 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
  815                 (*pru->pru_abort)(so);
  816                 return;
  817         }
  818 #endif
  819 
  820         INP_WLOCK(inp);
  821         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
  822                 INP_HASH_WLOCK(&V_udbinfo);
  823                 in6_pcbdisconnect(inp);
  824                 inp->in6p_laddr = in6addr_any;
  825                 INP_HASH_WUNLOCK(&V_udbinfo);
  826                 soisdisconnected(so);
  827         }
  828         INP_WUNLOCK(inp);
  829 }
  830 
  831 static int
  832 udp6_attach(struct socket *so, int proto, struct thread *td)
  833 {
  834         struct inpcb *inp;
  835         int error;
  836 
  837         inp = sotoinpcb(so);
  838         KASSERT(inp == NULL, ("udp6_attach: inp != NULL"));
  839 
  840         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
  841                 error = soreserve(so, udp_sendspace, udp_recvspace);
  842                 if (error)
  843                         return (error);
  844         }
  845         INP_INFO_WLOCK(&V_udbinfo);
  846         error = in_pcballoc(so, &V_udbinfo);
  847         if (error) {
  848                 INP_INFO_WUNLOCK(&V_udbinfo);
  849                 return (error);
  850         }
  851         inp = (struct inpcb *)so->so_pcb;
  852         inp->inp_vflag |= INP_IPV6;
  853         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
  854                 inp->inp_vflag |= INP_IPV4;
  855         inp->in6p_hops = -1;    /* use kernel default */
  856         inp->in6p_cksum = -1;   /* just to be sure */
  857         /*
  858          * XXX: ugly!!
  859          * IPv4 TTL initialization is necessary for an IPv6 socket as well,
  860          * because the socket may be bound to an IPv6 wildcard address,
  861          * which may match an IPv4-mapped IPv6 address.
  862          */
  863         inp->inp_ip_ttl = V_ip_defttl;
  864 
  865         error = udp_newudpcb(inp);
  866         if (error) {
  867                 in_pcbdetach(inp);
  868                 in_pcbfree(inp);
  869                 INP_INFO_WUNLOCK(&V_udbinfo);
  870                 return (error);
  871         }
  872         INP_WUNLOCK(inp);
  873         INP_INFO_WUNLOCK(&V_udbinfo);
  874         return (0);
  875 }
  876 
  877 static int
  878 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
  879 {
  880         struct inpcb *inp;
  881         int error;
  882 
  883         inp = sotoinpcb(so);
  884         KASSERT(inp != NULL, ("udp6_bind: inp == NULL"));
  885 
  886         INP_WLOCK(inp);
  887         INP_HASH_WLOCK(&V_udbinfo);
  888         inp->inp_vflag &= ~INP_IPV4;
  889         inp->inp_vflag |= INP_IPV6;
  890         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
  891                 struct sockaddr_in6 *sin6_p;
  892 
  893                 sin6_p = (struct sockaddr_in6 *)nam;
  894 
  895                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
  896                         inp->inp_vflag |= INP_IPV4;
  897 #ifdef INET
  898                 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
  899                         struct sockaddr_in sin;
  900 
  901                         in6_sin6_2_sin(&sin, sin6_p);
  902                         inp->inp_vflag |= INP_IPV4;
  903                         inp->inp_vflag &= ~INP_IPV6;
  904                         error = in_pcbbind(inp, (struct sockaddr *)&sin,
  905                             td->td_ucred);
  906                         goto out;
  907                 }
  908 #endif
  909         }
  910 
  911         error = in6_pcbbind(inp, nam, td->td_ucred);
  912 #ifdef INET
  913 out:
  914 #endif
  915         INP_HASH_WUNLOCK(&V_udbinfo);
  916         INP_WUNLOCK(inp);
  917         return (error);
  918 }
  919 
  920 static void
  921 udp6_close(struct socket *so)
  922 {
  923         struct inpcb *inp;
  924 
  925         inp = sotoinpcb(so);
  926         KASSERT(inp != NULL, ("udp6_close: inp == NULL"));
  927 
  928 #ifdef INET
  929         if (inp->inp_vflag & INP_IPV4) {
  930                 struct pr_usrreqs *pru;
  931 
  932                 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
  933                 (*pru->pru_disconnect)(so);
  934                 return;
  935         }
  936 #endif
  937         INP_WLOCK(inp);
  938         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
  939                 INP_HASH_WLOCK(&V_udbinfo);
  940                 in6_pcbdisconnect(inp);
  941                 inp->in6p_laddr = in6addr_any;
  942                 INP_HASH_WUNLOCK(&V_udbinfo);
  943                 soisdisconnected(so);
  944         }
  945         INP_WUNLOCK(inp);
  946 }
  947 
  948 static int
  949 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
  950 {
  951         struct inpcb *inp;
  952         struct sockaddr_in6 *sin6;
  953         int error;
  954 
  955         inp = sotoinpcb(so);
  956         sin6 = (struct sockaddr_in6 *)nam;
  957         KASSERT(inp != NULL, ("udp6_connect: inp == NULL"));
  958 
  959         /*
  960          * XXXRW: Need to clarify locking of v4/v6 flags.
  961          */
  962         INP_WLOCK(inp);
  963 #ifdef INET
  964         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
  965                 struct sockaddr_in sin;
  966 
  967                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
  968                         error = EINVAL;
  969                         goto out;
  970                 }
  971                 if (inp->inp_faddr.s_addr != INADDR_ANY) {
  972                         error = EISCONN;
  973                         goto out;
  974                 }
  975                 in6_sin6_2_sin(&sin, sin6);
  976                 inp->inp_vflag |= INP_IPV4;
  977                 inp->inp_vflag &= ~INP_IPV6;
  978                 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr);
  979                 if (error != 0)
  980                         goto out;
  981                 INP_HASH_WLOCK(&V_udbinfo);
  982                 error = in_pcbconnect(inp, (struct sockaddr *)&sin,
  983                     td->td_ucred);
  984                 INP_HASH_WUNLOCK(&V_udbinfo);
  985                 if (error == 0)
  986                         soisconnected(so);
  987                 goto out;
  988         }
  989 #endif
  990         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
  991                 error = EISCONN;
  992                 goto out;
  993         }
  994         inp->inp_vflag &= ~INP_IPV4;
  995         inp->inp_vflag |= INP_IPV6;
  996         error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr);
  997         if (error != 0)
  998                 goto out;
  999         INP_HASH_WLOCK(&V_udbinfo);
 1000         error = in6_pcbconnect(inp, nam, td->td_ucred);
 1001         INP_HASH_WUNLOCK(&V_udbinfo);
 1002         if (error == 0)
 1003                 soisconnected(so);
 1004 out:
 1005         INP_WUNLOCK(inp);
 1006         return (error);
 1007 }
 1008 
 1009 static void
 1010 udp6_detach(struct socket *so)
 1011 {
 1012         struct inpcb *inp;
 1013         struct udpcb *up;
 1014 
 1015         inp = sotoinpcb(so);
 1016         KASSERT(inp != NULL, ("udp6_detach: inp == NULL"));
 1017 
 1018         INP_INFO_WLOCK(&V_udbinfo);
 1019         INP_WLOCK(inp);
 1020         up = intoudpcb(inp);
 1021         KASSERT(up != NULL, ("%s: up == NULL", __func__));
 1022         in_pcbdetach(inp);
 1023         in_pcbfree(inp);
 1024         INP_INFO_WUNLOCK(&V_udbinfo);
 1025         udp_discardcb(up);
 1026 }
 1027 
 1028 static int
 1029 udp6_disconnect(struct socket *so)
 1030 {
 1031         struct inpcb *inp;
 1032         int error;
 1033 
 1034         inp = sotoinpcb(so);
 1035         KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL"));
 1036 
 1037 #ifdef INET
 1038         if (inp->inp_vflag & INP_IPV4) {
 1039                 struct pr_usrreqs *pru;
 1040 
 1041                 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
 1042                 (void)(*pru->pru_disconnect)(so);
 1043                 return (0);
 1044         }
 1045 #endif
 1046 
 1047         INP_WLOCK(inp);
 1048 
 1049         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 1050                 error = ENOTCONN;
 1051                 goto out;
 1052         }
 1053 
 1054         INP_HASH_WLOCK(&V_udbinfo);
 1055         in6_pcbdisconnect(inp);
 1056         inp->in6p_laddr = in6addr_any;
 1057         INP_HASH_WUNLOCK(&V_udbinfo);
 1058         SOCK_LOCK(so);
 1059         so->so_state &= ~SS_ISCONNECTED;                /* XXX */
 1060         SOCK_UNLOCK(so);
 1061 out:
 1062         INP_WUNLOCK(inp);
 1063         return (0);
 1064 }
 1065 
 1066 static int
 1067 udp6_send(struct socket *so, int flags, struct mbuf *m,
 1068     struct sockaddr *addr, struct mbuf *control, struct thread *td)
 1069 {
 1070         struct inpcb *inp;
 1071         int error = 0;
 1072 
 1073         inp = sotoinpcb(so);
 1074         KASSERT(inp != NULL, ("udp6_send: inp == NULL"));
 1075 
 1076         INP_WLOCK(inp);
 1077         if (addr) {
 1078                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 1079                         error = EINVAL;
 1080                         goto bad;
 1081                 }
 1082                 if (addr->sa_family != AF_INET6) {
 1083                         error = EAFNOSUPPORT;
 1084                         goto bad;
 1085                 }
 1086         }
 1087 
 1088 #ifdef INET
 1089         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
 1090                 int hasv4addr;
 1091                 struct sockaddr_in6 *sin6 = 0;
 1092 
 1093                 if (addr == 0)
 1094                         hasv4addr = (inp->inp_vflag & INP_IPV4);
 1095                 else {
 1096                         sin6 = (struct sockaddr_in6 *)addr;
 1097                         hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
 1098                             ? 1 : 0;
 1099                 }
 1100                 if (hasv4addr) {
 1101                         struct pr_usrreqs *pru;
 1102 
 1103                         /*
 1104                          * XXXRW: We release UDP-layer locks before calling
 1105                          * udp_send() in order to avoid recursion.  However,
 1106                          * this does mean there is a short window where inp's
 1107                          * fields are unstable.  Could this lead to a
 1108                          * potential race in which the factors causing us to
 1109                          * select the UDPv4 output routine are invalidated?
 1110                          */
 1111                         INP_WUNLOCK(inp);
 1112                         if (sin6)
 1113                                 in6_sin6_2_sin_in_sock(addr);
 1114                         pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
 1115                         /* addr will just be freed in sendit(). */
 1116                         return ((*pru->pru_send)(so, flags, m, addr, control,
 1117                             td));
 1118                 }
 1119         }
 1120 #endif
 1121 #ifdef MAC
 1122         mac_inpcb_create_mbuf(inp, m);
 1123 #endif
 1124         INP_HASH_WLOCK(&V_udbinfo);
 1125         error = udp6_output(inp, m, addr, control, td);
 1126         INP_HASH_WUNLOCK(&V_udbinfo);
 1127 #ifdef INET
 1128 #endif  
 1129         INP_WUNLOCK(inp);
 1130         return (error);
 1131 
 1132 bad:
 1133         INP_WUNLOCK(inp);
 1134         m_freem(m);
 1135         return (error);
 1136 }
 1137 
 1138 struct pr_usrreqs udp6_usrreqs = {
 1139         .pru_abort =            udp6_abort,
 1140         .pru_attach =           udp6_attach,
 1141         .pru_bind =             udp6_bind,
 1142         .pru_connect =          udp6_connect,
 1143         .pru_control =          in6_control,
 1144         .pru_detach =           udp6_detach,
 1145         .pru_disconnect =       udp6_disconnect,
 1146         .pru_peeraddr =         in6_mapped_peeraddr,
 1147         .pru_send =             udp6_send,
 1148         .pru_shutdown =         udp_shutdown,
 1149         .pru_sockaddr =         in6_mapped_sockaddr,
 1150         .pru_soreceive =        soreceive_dgram,
 1151         .pru_sosend =           sosend_dgram,
 1152         .pru_sosetlabel =       in_pcbsosetlabel,
 1153         .pru_close =            udp6_close
 1154 };

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