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 /*      $FreeBSD: stable/4/sys/netinet6/udp6_usrreq.c 155465 2006-02-09 03:41:51Z ume $ */
    2 /*      $KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 jinmei Exp $    */
    3 
    4 /*
    5  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the project nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  */
   32 
   33 /*
   34  * Copyright (c) 1982, 1986, 1989, 1993
   35  *      The Regents of the University of California.  All rights reserved.
   36  *
   37  * Redistribution and use in source and binary forms, with or without
   38  * modification, are permitted provided that the following conditions
   39  * are met:
   40  * 1. Redistributions of source code must retain the above copyright
   41  *    notice, this list of conditions and the following disclaimer.
   42  * 2. Redistributions in binary form must reproduce the above copyright
   43  *    notice, this list of conditions and the following disclaimer in the
   44  *    documentation and/or other materials provided with the distribution.
   45  * 3. All advertising materials mentioning features or use of this software
   46  *    must display the following acknowledgement:
   47  *      This product includes software developed by the University of
   48  *      California, Berkeley and its contributors.
   49  * 4. Neither the name of the University nor the names of its contributors
   50  *    may be used to endorse or promote products derived from this software
   51  *    without specific prior written permission.
   52  *
   53  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   54  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   55  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   56  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   57  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   58  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   59  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   60  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   61  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   62  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   63  * SUCH DAMAGE.
   64  *
   65  *      @(#)udp_var.h   8.1 (Berkeley) 6/10/93
   66  */
   67 
   68 #include "opt_inet.h"
   69 #include "opt_inet6.h"
   70 #include "opt_ipsec.h"
   71 
   72 #include <sys/param.h>
   73 #include <sys/kernel.h>
   74 #include <sys/mbuf.h>
   75 #include <sys/protosw.h>
   76 #include <sys/socket.h>
   77 #include <sys/socketvar.h>
   78 #include <sys/sysctl.h>
   79 #include <sys/errno.h>
   80 #include <sys/stat.h>
   81 #include <sys/systm.h>
   82 #include <sys/syslog.h>
   83 #include <sys/proc.h>
   84 
   85 #include <net/if.h>
   86 #include <net/route.h>
   87 #include <net/if_types.h>
   88 
   89 #include <netinet/in.h>
   90 #include <netinet/in_systm.h>
   91 #include <netinet/ip.h>
   92 #include <netinet/in_pcb.h>
   93 #include <netinet/in_var.h>
   94 #include <netinet/ip_var.h>
   95 #include <netinet/udp.h>
   96 #include <netinet/udp_var.h>
   97 #include <netinet/ip6.h>
   98 #include <netinet6/ip6_var.h>
   99 #include <netinet6/in6_pcb.h>
  100 #include <netinet/icmp6.h>
  101 #include <netinet6/udp6_var.h>
  102 #include <netinet6/ip6protosw.h>
  103 
  104 #ifdef IPSEC
  105 #include <netinet6/ipsec.h>
  106 #include <netinet6/ipsec6.h>
  107 #endif /* IPSEC */
  108 
  109 #ifdef FAST_IPSEC
  110 #include <netipsec/ipsec.h>
  111 #include <netipsec/ipsec6.h>
  112 #endif /* FAST_IPSEC */
  113 
  114 /*
  115  * UDP protocol inplementation.
  116  * Per RFC 768, August, 1980.
  117  */
  118 
  119 extern  struct protosw inetsw[];
  120 static  int in6_mcmatch __P((struct inpcb *, struct in6_addr *, struct ifnet *));
  121 static  int udp6_detach __P((struct socket *so));
  122 
  123 static int
  124 in6_mcmatch(in6p, ia6, ifp)
  125         struct inpcb *in6p;
  126         register struct in6_addr *ia6;
  127         struct ifnet *ifp;
  128 {
  129         struct ip6_moptions *im6o = in6p->in6p_moptions;
  130         struct in6_multi_mship *imm;
  131 
  132         if (im6o == NULL)
  133                 return 0;
  134 
  135         for (imm = im6o->im6o_memberships.lh_first; imm != NULL;
  136              imm = imm->i6mm_chain.le_next) {
  137                 if ((ifp == NULL ||
  138                      imm->i6mm_maddr->in6m_ifp == ifp) &&
  139                     IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr,
  140                                        ia6))
  141                         return 1;
  142         }
  143         return 0;
  144 }
  145 
  146 int
  147 udp6_input(mp, offp, proto)
  148         struct mbuf **mp;
  149         int *offp, proto;
  150 {
  151         struct mbuf *m = *mp;
  152         register struct ip6_hdr *ip6;
  153         register struct udphdr *uh;
  154         register struct inpcb *in6p;
  155         struct  mbuf *opts = NULL;
  156         int off = *offp;
  157         int plen, ulen;
  158         struct sockaddr_in6 udp_in6;
  159 
  160         IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
  161 
  162         ip6 = mtod(m, struct ip6_hdr *);
  163 
  164         if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
  165                 /* XXX send icmp6 host/port unreach? */
  166                 m_freem(m);
  167                 return IPPROTO_DONE;
  168         }
  169 
  170         udpstat.udps_ipackets++;
  171 
  172         plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
  173         uh = (struct udphdr *)((caddr_t)ip6 + off);
  174         ulen = ntohs((u_short)uh->uh_ulen);
  175 
  176         if (plen != ulen) {
  177                 udpstat.udps_badlen++;
  178                 goto bad;
  179         }
  180 
  181         /*
  182          * Checksum extended UDP header and data.
  183          */
  184         if (uh->uh_sum == 0)
  185                 udpstat.udps_nosum++;
  186         else if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
  187                 udpstat.udps_badsum++;
  188                 goto bad;
  189         }
  190 
  191         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
  192                 struct  inpcb *last;
  193 
  194                 /*
  195                  * Deliver a multicast datagram to all sockets
  196                  * for which the local and remote addresses and ports match
  197                  * those of the incoming datagram.  This allows more than
  198                  * one process to receive multicasts on the same port.
  199                  * (This really ought to be done for unicast datagrams as
  200                  * well, but that would cause problems with existing
  201                  * applications that open both address-specific sockets and
  202                  * a wildcard socket listening to the same port -- they would
  203                  * end up receiving duplicates of every unicast datagram.
  204                  * Those applications open the multiple sockets to overcome an
  205                  * inadequacy of the UDP socket interface, but for backwards
  206                  * compatibility we avoid the problem here rather than
  207                  * fixing the interface.  Maybe 4.5BSD will remedy this?)
  208                  */
  209 
  210                 /*
  211                  * In a case that laddr should be set to the link-local
  212                  * address (this happens in RIPng), the multicast address
  213                  * specified in the received packet does not match with
  214                  * laddr. To cure this situation, the matching is relaxed
  215                  * if the receiving interface is the same as one specified
  216                  * in the socket and if the destination multicast address
  217                  * matches one of the multicast groups specified in the socket.
  218                  */
  219 
  220                 /*
  221                  * Construct sockaddr format source address.
  222                  */
  223                 init_sin6(&udp_in6, m); /* general init */
  224                 udp_in6.sin6_port = uh->uh_sport;
  225                 /*
  226                  * KAME note: traditionally we dropped udpiphdr from mbuf here.
  227                  * We need udphdr for IPsec processing so we do that later.
  228                  */
  229 
  230                 /*
  231                  * Locate pcb(s) for datagram.
  232                  * (Algorithm copied from raw_intr().)
  233                  */
  234                 last = NULL;
  235                 LIST_FOREACH(in6p, &udb, inp_list) {
  236                         if ((in6p->inp_vflag & INP_IPV6) == 0)
  237                                 continue;
  238                         if (in6p->in6p_lport != uh->uh_dport)
  239                                 continue;
  240                         if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
  241                                 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
  242                                                         &ip6->ip6_dst) &&
  243                                     !in6_mcmatch(in6p, &ip6->ip6_dst,
  244                                                  m->m_pkthdr.rcvif))
  245                                         continue;
  246                         }
  247                         if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
  248                                 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
  249                                                         &ip6->ip6_src) ||
  250                                    in6p->in6p_fport != uh->uh_sport)
  251                                         continue;
  252                         }
  253 
  254                         if (last != NULL) {
  255                                 struct  mbuf *n;
  256 
  257 #ifdef IPSEC
  258                                 /*
  259                                  * Check AH/ESP integrity.
  260                                  */
  261                                 if (ipsec6_in_reject_so(m, last->inp_socket))
  262                                         ipsec6stat.in_polvio++;
  263                                         /* do not inject data into pcb */
  264                                 else
  265 #endif /* IPSEC */
  266 #ifdef FAST_IPSEC
  267                                 /*
  268                                  * Check AH/ESP integrity.
  269                                  */
  270                                 if (ipsec6_in_reject(m, last))
  271                                         ;
  272                                 else
  273 #endif /* FAST_IPSEC */
  274                                 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
  275                                         /*
  276                                          * KAME NOTE: do not
  277                                          * m_copy(m, offset, ...) above.
  278                                          * sbappendaddr() expects M_PKTHDR,
  279                                          * and m_copy() will copy M_PKTHDR
  280                                          * only if offset is 0.
  281                                          */
  282                                         if (last->in6p_flags & IN6P_CONTROLOPTS
  283                                             || last->in6p_socket->so_options & SO_TIMESTAMP)
  284                                                 ip6_savecontrol(last, &opts,
  285                                                                 ip6, n);
  286                                                                 
  287                                         m_adj(n, off + sizeof(struct udphdr));
  288                                         if (sbappendaddr(&last->in6p_socket->so_rcv,
  289                                                         (struct sockaddr *)&udp_in6,
  290                                                         n, opts) == 0) {
  291                                                 m_freem(n);
  292                                                 if (opts)
  293                                                         m_freem(opts);
  294                                                 udpstat.udps_fullsock++;
  295                                         } else
  296                                                 sorwakeup(last->in6p_socket);
  297                                         opts = NULL;
  298                                 }
  299                         }
  300                         last = in6p;
  301                         /*
  302                          * Don't look for additional matches if this one does
  303                          * not have either the SO_REUSEPORT or SO_REUSEADDR
  304                          * socket options set.  This heuristic avoids searching
  305                          * through all pcbs in the common case of a non-shared
  306                          * port.  It assumes that an application will never
  307                          * clear these options after setting them.
  308                          */
  309                         if ((last->in6p_socket->so_options &
  310                              (SO_REUSEPORT|SO_REUSEADDR)) == 0)
  311                                 break;
  312                 }
  313 
  314                 if (last == NULL) {
  315                         /*
  316                          * No matching pcb found; discard datagram.
  317                          * (No need to send an ICMP Port Unreachable
  318                          * for a broadcast or multicast datgram.)
  319                          */
  320                         udpstat.udps_noport++;
  321                         udpstat.udps_noportmcast++;
  322                         goto bad;
  323                 }
  324 #ifdef IPSEC
  325                 /*
  326                  * Check AH/ESP integrity.
  327                  */
  328                 if (ipsec6_in_reject_so(m, last->inp_socket)) {
  329                         ipsec6stat.in_polvio++;
  330                         goto bad;
  331                 }
  332 #endif /* IPSEC */
  333 #ifdef FAST_IPSEC
  334                 /*
  335                  * Check AH/ESP integrity.
  336                  */
  337                 if (ipsec6_in_reject(m, last)) {
  338                         goto bad;
  339                 }
  340 #endif /* FAST_IPSEC */
  341                 if (last->in6p_flags & IN6P_CONTROLOPTS
  342                     || last->in6p_socket->so_options & SO_TIMESTAMP)
  343                         ip6_savecontrol(last, &opts, ip6, m);
  344 
  345                 m_adj(m, off + sizeof(struct udphdr));
  346                 if (sbappendaddr(&last->in6p_socket->so_rcv,
  347                                 (struct sockaddr *)&udp_in6,
  348                                 m, opts) == 0) {
  349                         udpstat.udps_fullsock++;
  350                         goto bad;
  351                 }
  352                 sorwakeup(last->in6p_socket);
  353                 return IPPROTO_DONE;
  354         }
  355         /*
  356          * Locate pcb for datagram.
  357          */
  358         in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport,
  359                                   &ip6->ip6_dst, uh->uh_dport, 1,
  360                                   m->m_pkthdr.rcvif);
  361         if (in6p == 0) {
  362                 if (log_in_vain) {
  363                         char buf[INET6_ADDRSTRLEN];
  364 
  365                         strcpy(buf, ip6_sprintf(&ip6->ip6_dst));
  366                         log(LOG_INFO,
  367                             "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
  368                             buf, ntohs(uh->uh_dport),
  369                             ip6_sprintf(&ip6->ip6_src), ntohs(uh->uh_sport));
  370                 }
  371                 udpstat.udps_noport++;
  372                 if (m->m_flags & M_MCAST) {
  373                         printf("UDP6: M_MCAST is set in a unicast packet.\n");
  374                         udpstat.udps_noportmcast++;
  375                         goto bad;
  376                 }
  377                 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
  378                 return IPPROTO_DONE;
  379         }
  380 #ifdef IPSEC
  381         /*
  382          * Check AH/ESP integrity.
  383          */
  384         if (ipsec6_in_reject_so(m, in6p->in6p_socket)) {
  385                 ipsec6stat.in_polvio++;
  386                 goto bad;
  387         }
  388 #endif /* IPSEC */
  389 #ifdef FAST_IPSEC
  390         /*
  391          * Check AH/ESP integrity.
  392          */
  393         if (ipsec6_in_reject(m, in6p)) {
  394                 goto bad;
  395         }
  396 #endif /* FAST_IPSEC */
  397 
  398         /*
  399          * Construct sockaddr format source address.
  400          * Stuff source address and datagram in user buffer.
  401          */
  402         init_sin6(&udp_in6, m); /* general init */
  403         udp_in6.sin6_port = uh->uh_sport;
  404         if (in6p->in6p_flags & IN6P_CONTROLOPTS
  405             || in6p->in6p_socket->so_options & SO_TIMESTAMP)
  406                 ip6_savecontrol(in6p, &opts, ip6, m);
  407         m_adj(m, off + sizeof(struct udphdr));
  408         if (sbappendaddr(&in6p->in6p_socket->so_rcv,
  409                         (struct sockaddr *)&udp_in6,
  410                         m, opts) == 0) {
  411                 udpstat.udps_fullsock++;
  412                 goto bad;
  413         }
  414         sorwakeup(in6p->in6p_socket);
  415         return IPPROTO_DONE;
  416 bad:
  417         if (m)
  418                 m_freem(m);
  419         if (opts)
  420                 m_freem(opts);
  421         return IPPROTO_DONE;
  422 }
  423 
  424 void
  425 udp6_ctlinput(cmd, sa, d)
  426         int cmd;
  427         struct sockaddr *sa;
  428         void *d;
  429 {
  430         struct udphdr uh;
  431         struct ip6_hdr *ip6;
  432         struct mbuf *m;
  433         int off = 0;
  434         struct ip6ctlparam *ip6cp = NULL;
  435         const struct sockaddr_in6 *sa6_src = NULL;
  436         void (*notify) __P((struct inpcb *, int)) = udp_notify;
  437         struct udp_portonly {
  438                 u_int16_t uh_sport;
  439                 u_int16_t uh_dport;
  440         } *uhp;
  441 
  442         if (sa->sa_family != AF_INET6 ||
  443             sa->sa_len != sizeof(struct sockaddr_in6))
  444                 return;
  445 
  446         if ((unsigned)cmd >= PRC_NCMDS)
  447                 return;
  448         if (PRC_IS_REDIRECT(cmd))
  449                 notify = in6_rtchange, d = NULL;
  450         else if (cmd == PRC_HOSTDEAD)
  451                 d = NULL;
  452         else if (inet6ctlerrmap[cmd] == 0)
  453                 return;
  454 
  455         /* if the parameter is from icmp6, decode it. */
  456         if (d != NULL) {
  457                 ip6cp = (struct ip6ctlparam *)d;
  458                 m = ip6cp->ip6c_m;
  459                 ip6 = ip6cp->ip6c_ip6;
  460                 off = ip6cp->ip6c_off;
  461                 sa6_src = ip6cp->ip6c_src;
  462         } else {
  463                 m = NULL;
  464                 ip6 = NULL;
  465                 sa6_src = &sa6_any;
  466         }
  467 
  468         if (ip6) {
  469                 /*
  470                  * XXX: We assume that when IPV6 is non NULL,
  471                  * M and OFF are valid.
  472                  */
  473 
  474                 /* check if we can safely examine src and dst ports */
  475                 if (m->m_pkthdr.len < off + sizeof(*uhp))
  476                         return;
  477 
  478                 bzero(&uh, sizeof(uh));
  479                 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
  480 
  481                 (void) in6_pcbnotify(&udb, sa, uh.uh_dport,
  482                                      (struct sockaddr *)ip6cp->ip6c_src, 
  483                                      uh.uh_sport, cmd, notify);
  484         } else
  485                 (void) in6_pcbnotify(&udb, sa, 0, (struct sockaddr *)sa6_src,
  486                                      0, cmd, notify);
  487 }
  488 
  489 static int
  490 udp6_getcred(SYSCTL_HANDLER_ARGS)
  491 {
  492         struct sockaddr_in6 addrs[2];
  493         struct inpcb *inp;
  494         int error, s;
  495 
  496         error = suser(req->p);
  497         if (error)
  498                 return (error);
  499 
  500         if (req->newlen != sizeof(addrs))
  501                 return (EINVAL);
  502         if (req->oldlen != sizeof(struct ucred))
  503                 return (EINVAL);
  504         error = SYSCTL_IN(req, addrs, sizeof(addrs));
  505         if (error)
  506                 return (error);
  507         s = splnet();
  508         inp = in6_pcblookup_hash(&udbinfo, &addrs[1].sin6_addr,
  509                                  addrs[1].sin6_port,
  510                                  &addrs[0].sin6_addr, addrs[0].sin6_port,
  511                                  1, NULL);
  512         if (!inp || !inp->inp_socket) {
  513                 error = ENOENT;
  514                 goto out;
  515         }
  516         error = SYSCTL_OUT(req, inp->inp_socket->so_cred,
  517                            sizeof(struct ucred));
  518 
  519 out:
  520         splx(s);
  521         return (error);
  522 }
  523 
  524 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
  525             0, 0,
  526             udp6_getcred, "S,ucred", "Get the ucred of a UDP6 connection");
  527 
  528 static int
  529 udp6_abort(struct socket *so)
  530 {
  531         struct inpcb *inp;
  532         int s;
  533 
  534         inp = sotoinpcb(so);
  535         if (inp == 0)
  536                 return EINVAL;  /* ??? possible? panic instead? */
  537         soisdisconnected(so);
  538         s = splnet();
  539         in6_pcbdetach(inp);
  540         splx(s);
  541         return 0;
  542 }
  543 
  544 static int
  545 udp6_attach(struct socket *so, int proto, struct proc *p)
  546 {
  547         struct inpcb *inp;
  548         int s, error;
  549 
  550         inp = sotoinpcb(so);
  551         if (inp != 0)
  552                 return EINVAL;
  553 
  554         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
  555                 error = soreserve(so, udp_sendspace, udp_recvspace);
  556                 if (error)
  557                         return error;
  558         }
  559         s = splnet();
  560         error = in_pcballoc(so, &udbinfo, p);
  561         splx(s);
  562         if (error)
  563                 return error;
  564         inp = (struct inpcb *)so->so_pcb;
  565         inp->inp_vflag |= INP_IPV6;
  566         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
  567                 inp->inp_vflag |= INP_IPV4;
  568         inp->in6p_hops = -1;    /* use kernel default */
  569         inp->in6p_cksum = -1;   /* just to be sure */
  570         /*
  571          * XXX: ugly!!
  572          * IPv4 TTL initialization is necessary for an IPv6 socket as well,
  573          * because the socket may be bound to an IPv6 wildcard address,
  574          * which may match an IPv4-mapped IPv6 address.
  575          */
  576         inp->inp_ip_ttl = ip_defttl;
  577         return 0;
  578 }
  579 
  580 static int
  581 udp6_bind(struct socket *so, struct sockaddr *nam, struct proc *p)
  582 {
  583         struct inpcb *inp;
  584         int s, error;
  585 
  586         inp = sotoinpcb(so);
  587         if (inp == 0)
  588                 return EINVAL;
  589 
  590         inp->inp_vflag &= ~INP_IPV4;
  591         inp->inp_vflag |= INP_IPV6;
  592         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
  593                 struct sockaddr_in6 *sin6_p;
  594 
  595                 sin6_p = (struct sockaddr_in6 *)nam;
  596 
  597                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
  598                         inp->inp_vflag |= INP_IPV4;
  599                 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
  600                         struct sockaddr_in sin;
  601 
  602                         in6_sin6_2_sin(&sin, sin6_p);
  603                         inp->inp_vflag |= INP_IPV4;
  604                         inp->inp_vflag &= ~INP_IPV6;
  605                         s = splnet();
  606                         error = in_pcbbind(inp, (struct sockaddr *)&sin, p);
  607                         splx(s);
  608                         return error;
  609                 }
  610         }
  611 
  612         s = splnet();
  613         error = in6_pcbbind(inp, nam, p);
  614         splx(s);
  615         return error;
  616 }
  617 
  618 static int
  619 udp6_connect(struct socket *so, struct sockaddr *nam, struct proc *p)
  620 {
  621         struct inpcb *inp;
  622         int s, error;
  623 
  624         inp = sotoinpcb(so);
  625         if (inp == 0)
  626                 return EINVAL;
  627 
  628         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
  629                 struct sockaddr_in6 *sin6_p;
  630 
  631                 sin6_p = (struct sockaddr_in6 *)nam;
  632                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
  633                         struct sockaddr_in sin;
  634 
  635                         if (inp->inp_faddr.s_addr != INADDR_ANY)
  636                                 return EISCONN;
  637                         in6_sin6_2_sin(&sin, sin6_p);
  638                         s = splnet();
  639                         error = in_pcbconnect(inp, (struct sockaddr *)&sin, p);
  640                         splx(s);
  641                         if (error == 0) {
  642                                 inp->inp_vflag |= INP_IPV4;
  643                                 inp->inp_vflag &= ~INP_IPV6;
  644                                 soisconnected(so);
  645                         }
  646                         return error;
  647                 }
  648         }
  649         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
  650                 return EISCONN;
  651         s = splnet();
  652         error = in6_pcbconnect(inp, nam, p);
  653         splx(s);
  654         if (error == 0) {
  655                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
  656                         /* should be non mapped addr */
  657                         inp->inp_vflag &= ~INP_IPV4;
  658                         inp->inp_vflag |= INP_IPV6;
  659                 }
  660                 soisconnected(so);
  661         }
  662         return error;
  663 }
  664 
  665 static int
  666 udp6_detach(struct socket *so)
  667 {
  668         struct inpcb *inp;
  669         int s;
  670 
  671         inp = sotoinpcb(so);
  672         if (inp == 0)
  673                 return EINVAL;
  674         s = splnet();
  675         in6_pcbdetach(inp);
  676         splx(s);
  677         return 0;
  678 }
  679 
  680 static int
  681 udp6_disconnect(struct socket *so)
  682 {
  683         struct inpcb *inp;
  684         int s;
  685 
  686         inp = sotoinpcb(so);
  687         if (inp == 0)
  688                 return EINVAL;
  689 
  690         if (inp->inp_vflag & INP_IPV4) {
  691                 struct pr_usrreqs *pru;
  692 
  693                 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
  694                 return ((*pru->pru_disconnect)(so));
  695         }
  696 
  697         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
  698                 return ENOTCONN;
  699 
  700         s = splnet();
  701         in6_pcbdisconnect(inp);
  702         inp->in6p_laddr = in6addr_any;
  703         splx(s);
  704         so->so_state &= ~SS_ISCONNECTED;                /* XXX */
  705         return 0;
  706 }
  707 
  708 static int
  709 udp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
  710           struct mbuf *control, struct proc *p)
  711 {
  712         struct inpcb *inp;
  713         int error = 0;
  714 
  715         inp = sotoinpcb(so);
  716         if (inp == 0) {
  717                 error = EINVAL;
  718                 goto bad;
  719         }
  720 
  721         if (addr) {
  722                 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 
  723                         error = EINVAL;
  724                         goto bad;
  725                 }
  726                 if (addr->sa_family != AF_INET6) {
  727                         error = EAFNOSUPPORT;
  728                         goto bad;
  729                 }
  730         }
  731 
  732         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
  733                 int hasv4addr;
  734                 struct sockaddr_in6 *sin6 = 0;
  735 
  736                 if (addr == 0)
  737                         hasv4addr = (inp->inp_vflag & INP_IPV4);
  738                 else {
  739                         sin6 = (struct sockaddr_in6 *)addr;
  740                         hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
  741                                 ? 1 : 0;
  742                 }
  743                 if (hasv4addr) {
  744                         struct pr_usrreqs *pru;
  745 
  746                         if (sin6)
  747                                 in6_sin6_2_sin_in_sock(addr);
  748                         pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
  749                         error = ((*pru->pru_send)(so, flags, m, addr, control,
  750                                                   p));
  751                         /* addr will just be freed in sendit(). */
  752                         return error;
  753                 }
  754         }
  755 
  756         return udp6_output(inp, m, addr, control, p);
  757 
  758   bad:
  759         m_freem(m);
  760         return(error);
  761 }
  762 
  763 struct pr_usrreqs udp6_usrreqs = {
  764         udp6_abort, pru_accept_notsupp, udp6_attach, udp6_bind, udp6_connect,
  765         pru_connect2_notsupp, in6_control, udp6_detach, udp6_disconnect,
  766         pru_listen_notsupp, in6_mapped_peeraddr, pru_rcvd_notsupp,
  767         pru_rcvoob_notsupp, udp6_send, pru_sense_null, udp_shutdown,
  768         in6_mapped_sockaddr, sosend, soreceive, sopoll
  769 };

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