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 /*      $FreeBSD: releng/5.0/sys/netinet6/udp6_usrreq.c 105199 2002-10-16 02:25:05Z sam $       */
    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/errno.h>
   74 #include <sys/kernel.h>
   75 #include <sys/lock.h>
   76 #include <sys/mbuf.h>
   77 #include <sys/proc.h>
   78 #include <sys/protosw.h>
   79 #include <sys/signalvar.h>
   80 #include <sys/socket.h>
   81 #include <sys/socketvar.h>
   82 #include <sys/stat.h>
   83 #include <sys/sx.h>
   84 #include <sys/sysctl.h>
   85 #include <sys/syslog.h>
   86 #include <sys/systm.h>
   87 
   88 #include <net/if.h>
   89 #include <net/if_types.h>
   90 #include <net/route.h>
   91 
   92 #include <netinet/in.h>
   93 #include <netinet/in_pcb.h>
   94 #include <netinet/in_systm.h>
   95 #include <netinet/in_var.h>
   96 #include <netinet/ip.h>
   97 #include <netinet/ip6.h>
   98 #include <netinet/icmp6.h>
   99 #include <netinet/ip_var.h>
  100 #include <netinet/udp.h>
  101 #include <netinet/udp_var.h>
  102 #include <netinet6/ip6protosw.h>
  103 #include <netinet6/ip6_var.h>
  104 #include <netinet6/in6_pcb.h>
  105 #include <netinet6/udp6_var.h>
  106 
  107 #ifdef IPSEC
  108 #include <netinet6/ipsec.h>
  109 #include <netinet6/ipsec6.h>
  110 #endif /* IPSEC */
  111 
  112 #ifdef FAST_IPSEC
  113 #include <netipsec/ipsec.h>
  114 #include <netipsec/ipsec6.h>
  115 #endif /* FAST_IPSEC */
  116 
  117 /*
  118  * UDP protocol inplementation.
  119  * Per RFC 768, August, 1980.
  120  */
  121 
  122 extern  struct protosw inetsw[];
  123 static  int in6_mcmatch __P((struct inpcb *, struct in6_addr *, struct ifnet *));
  124 static  int udp6_detach __P((struct socket *so));
  125 
  126 static int
  127 in6_mcmatch(in6p, ia6, ifp)
  128         struct inpcb *in6p;
  129         register struct in6_addr *ia6;
  130         struct ifnet *ifp;
  131 {
  132         struct ip6_moptions *im6o = in6p->in6p_moptions;
  133         struct in6_multi_mship *imm;
  134 
  135         if (im6o == NULL)
  136                 return 0;
  137 
  138         for (imm = im6o->im6o_memberships.lh_first; imm != NULL;
  139              imm = imm->i6mm_chain.le_next) {
  140                 if ((ifp == NULL ||
  141                      imm->i6mm_maddr->in6m_ifp == ifp) &&
  142                     IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr,
  143                                        ia6))
  144                         return 1;
  145         }
  146         return 0;
  147 }
  148 
  149 int
  150 udp6_input(mp, offp, proto)
  151         struct mbuf **mp;
  152         int *offp, proto;
  153 {
  154         struct mbuf *m = *mp;
  155         register struct ip6_hdr *ip6;
  156         register struct udphdr *uh;
  157         register struct inpcb *in6p;
  158         struct  mbuf *opts = NULL;
  159         int off = *offp;
  160         int plen, ulen;
  161         struct sockaddr_in6 udp_in6;
  162 
  163         IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
  164 
  165         ip6 = mtod(m, struct ip6_hdr *);
  166 
  167         if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
  168                 /* XXX send icmp6 host/port unreach? */
  169                 m_freem(m);
  170                 return IPPROTO_DONE;
  171         }
  172 
  173         udpstat.udps_ipackets++;
  174 
  175         plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
  176         uh = (struct udphdr *)((caddr_t)ip6 + off);
  177         ulen = ntohs((u_short)uh->uh_ulen);
  178 
  179         if (plen != ulen) {
  180                 udpstat.udps_badlen++;
  181                 goto bad;
  182         }
  183 
  184         /*
  185          * Checksum extended UDP header and data.
  186          */
  187         if (uh->uh_sum == 0)
  188                 udpstat.udps_nosum++;
  189         else if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
  190                 udpstat.udps_badsum++;
  191                 goto bad;
  192         }
  193 
  194         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
  195                 struct  inpcb *last;
  196 
  197                 /*
  198                  * Deliver a multicast datagram to all sockets
  199                  * for which the local and remote addresses and ports match
  200                  * those of the incoming datagram.  This allows more than
  201                  * one process to receive multicasts on the same port.
  202                  * (This really ought to be done for unicast datagrams as
  203                  * well, but that would cause problems with existing
  204                  * applications that open both address-specific sockets and
  205                  * a wildcard socket listening to the same port -- they would
  206                  * end up receiving duplicates of every unicast datagram.
  207                  * Those applications open the multiple sockets to overcome an
  208                  * inadequacy of the UDP socket interface, but for backwards
  209                  * compatibility we avoid the problem here rather than
  210                  * fixing the interface.  Maybe 4.5BSD will remedy this?)
  211                  */
  212 
  213                 /*
  214                  * In a case that laddr should be set to the link-local
  215                  * address (this happens in RIPng), the multicast address
  216                  * specified in the received packet does not match with
  217                  * laddr. To cure this situation, the matching is relaxed
  218                  * if the receiving interface is the same as one specified
  219                  * in the socket and if the destination multicast address
  220                  * matches one of the multicast groups specified in the socket.
  221                  */
  222 
  223                 /*
  224                  * Construct sockaddr format source address.
  225                  */
  226                 init_sin6(&udp_in6, m); /* general init */
  227                 udp_in6.sin6_port = uh->uh_sport;
  228                 /*
  229                  * KAME note: traditionally we dropped udpiphdr from mbuf here.
  230                  * We need udphdr for IPsec processing so we do that later.
  231                  */
  232 
  233                 /*
  234                  * Locate pcb(s) for datagram.
  235                  * (Algorithm copied from raw_intr().)
  236                  */
  237                 last = NULL;
  238                 LIST_FOREACH(in6p, &udb, inp_list) {
  239                         if ((in6p->inp_vflag & INP_IPV6) == 0)
  240                                 continue;
  241                         if (in6p->in6p_lport != uh->uh_dport)
  242                                 continue;
  243                         if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
  244                                 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
  245                                                         &ip6->ip6_dst) &&
  246                                     !in6_mcmatch(in6p, &ip6->ip6_dst,
  247                                                  m->m_pkthdr.rcvif))
  248                                         continue;
  249                         }
  250                         if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
  251                                 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
  252                                                         &ip6->ip6_src) ||
  253                                    in6p->in6p_fport != uh->uh_sport)
  254                                         continue;
  255                         }
  256 
  257                         if (last != NULL) {
  258                                 struct  mbuf *n;
  259 
  260 #ifdef IPSEC
  261                                 /*
  262                                  * Check AH/ESP integrity.
  263                                  */
  264                                 if (ipsec6_in_reject_so(m, last->inp_socket))
  265                                         ipsec6stat.in_polvio++;
  266                                         /* do not inject data into pcb */
  267                                 else
  268 #endif /* IPSEC */
  269 #ifdef FAST_IPSEC
  270                                 /*
  271                                  * Check AH/ESP integrity.
  272                                  */
  273                                 if (ipsec6_in_reject(m, last))
  274                                         ;
  275                                 else
  276 #endif /* FAST_IPSEC */
  277                                 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
  278                                         /*
  279                                          * KAME NOTE: do not
  280                                          * m_copy(m, offset, ...) above.
  281                                          * sbappendaddr() expects M_PKTHDR,
  282                                          * and m_copy() will copy M_PKTHDR
  283                                          * only if offset is 0.
  284                                          */
  285                                         if (last->in6p_flags & IN6P_CONTROLOPTS
  286                                             || last->in6p_socket->so_options & SO_TIMESTAMP)
  287                                                 ip6_savecontrol(last, &opts,
  288                                                                 ip6, n);
  289                                                                 
  290                                         m_adj(n, off + sizeof(struct udphdr));
  291                                         if (sbappendaddr(&last->in6p_socket->so_rcv,
  292                                                         (struct sockaddr *)&udp_in6,
  293                                                         n, opts) == 0) {
  294                                                 m_freem(n);
  295                                                 if (opts)
  296                                                         m_freem(opts);
  297                                                 udpstat.udps_fullsock++;
  298                                         } else
  299                                                 sorwakeup(last->in6p_socket);
  300                                         opts = NULL;
  301                                 }
  302                         }
  303                         last = in6p;
  304                         /*
  305                          * Don't look for additional matches if this one does
  306                          * not have either the SO_REUSEPORT or SO_REUSEADDR
  307                          * socket options set.  This heuristic avoids searching
  308                          * through all pcbs in the common case of a non-shared
  309                          * port.  It assumes that an application will never
  310                          * clear these options after setting them.
  311                          */
  312                         if ((last->in6p_socket->so_options &
  313                              (SO_REUSEPORT|SO_REUSEADDR)) == 0)
  314                                 break;
  315                 }
  316 
  317                 if (last == NULL) {
  318                         /*
  319                          * No matching pcb found; discard datagram.
  320                          * (No need to send an ICMP Port Unreachable
  321                          * for a broadcast or multicast datgram.)
  322                          */
  323                         udpstat.udps_noport++;
  324                         udpstat.udps_noportmcast++;
  325                         goto bad;
  326                 }
  327 #ifdef IPSEC
  328                 /*
  329                  * Check AH/ESP integrity.
  330                  */
  331                 if (ipsec6_in_reject_so(m, last->inp_socket)) {
  332                         ipsec6stat.in_polvio++;
  333                         goto bad;
  334                 }
  335 #endif /* IPSEC */
  336 #ifdef FAST_IPSEC
  337                 /*
  338                  * Check AH/ESP integrity.
  339                  */
  340                 if (ipsec6_in_reject(m, last)) {
  341                         goto bad;
  342                 }
  343 #endif /* FAST_IPSEC */
  344                 if (last->in6p_flags & IN6P_CONTROLOPTS
  345                     || last->in6p_socket->so_options & SO_TIMESTAMP)
  346                         ip6_savecontrol(last, &opts, ip6, m);
  347 
  348                 m_adj(m, off + sizeof(struct udphdr));
  349                 if (sbappendaddr(&last->in6p_socket->so_rcv,
  350                                 (struct sockaddr *)&udp_in6,
  351                                 m, opts) == 0) {
  352                         udpstat.udps_fullsock++;
  353                         goto bad;
  354                 }
  355                 sorwakeup(last->in6p_socket);
  356                 return IPPROTO_DONE;
  357         }
  358         /*
  359          * Locate pcb for datagram.
  360          */
  361         in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport,
  362                                   &ip6->ip6_dst, uh->uh_dport, 1,
  363                                   m->m_pkthdr.rcvif);
  364         if (in6p == 0) {
  365                 if (log_in_vain) {
  366                         char buf[INET6_ADDRSTRLEN];
  367 
  368                         strcpy(buf, ip6_sprintf(&ip6->ip6_dst));
  369                         log(LOG_INFO,
  370                             "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
  371                             buf, ntohs(uh->uh_dport),
  372                             ip6_sprintf(&ip6->ip6_src), ntohs(uh->uh_sport));
  373                 }
  374                 udpstat.udps_noport++;
  375                 if (m->m_flags & M_MCAST) {
  376                         printf("UDP6: M_MCAST is set in a unicast packet.\n");
  377                         udpstat.udps_noportmcast++;
  378                         goto bad;
  379                 }
  380                 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
  381                 return IPPROTO_DONE;
  382         }
  383 #ifdef IPSEC
  384         /*
  385          * Check AH/ESP integrity.
  386          */
  387         if (ipsec6_in_reject_so(m, in6p->in6p_socket)) {
  388                 ipsec6stat.in_polvio++;
  389                 goto bad;
  390         }
  391 #endif /* IPSEC */
  392 #ifdef FAST_IPSEC
  393         /*
  394          * Check AH/ESP integrity.
  395          */
  396         if (ipsec6_in_reject(m, in6p)) {
  397                 goto bad;
  398         }
  399 #endif /* FAST_IPSEC */
  400 
  401         /*
  402          * Construct sockaddr format source address.
  403          * Stuff source address and datagram in user buffer.
  404          */
  405         init_sin6(&udp_in6, m); /* general init */
  406         udp_in6.sin6_port = uh->uh_sport;
  407         if (in6p->in6p_flags & IN6P_CONTROLOPTS
  408             || in6p->in6p_socket->so_options & SO_TIMESTAMP)
  409                 ip6_savecontrol(in6p, &opts, ip6, m);
  410         m_adj(m, off + sizeof(struct udphdr));
  411         if (sbappendaddr(&in6p->in6p_socket->so_rcv,
  412                         (struct sockaddr *)&udp_in6,
  413                         m, opts) == 0) {
  414                 udpstat.udps_fullsock++;
  415                 goto bad;
  416         }
  417         sorwakeup(in6p->in6p_socket);
  418         return IPPROTO_DONE;
  419 bad:
  420         if (m)
  421                 m_freem(m);
  422         if (opts)
  423                 m_freem(opts);
  424         return IPPROTO_DONE;
  425 }
  426 
  427 void
  428 udp6_ctlinput(cmd, sa, d)
  429         int cmd;
  430         struct sockaddr *sa;
  431         void *d;
  432 {
  433         struct udphdr uh;
  434         struct ip6_hdr *ip6;
  435         struct mbuf *m;
  436         int off = 0;
  437         struct ip6ctlparam *ip6cp = NULL;
  438         const struct sockaddr_in6 *sa6_src = NULL;
  439         struct inpcb *(*notify) __P((struct inpcb *, int)) = udp_notify;
  440         struct udp_portonly {
  441                 u_int16_t uh_sport;
  442                 u_int16_t uh_dport;
  443         } *uhp;
  444 
  445         if (sa->sa_family != AF_INET6 ||
  446             sa->sa_len != sizeof(struct sockaddr_in6))
  447                 return;
  448 
  449         if ((unsigned)cmd >= PRC_NCMDS)
  450                 return;
  451         if (PRC_IS_REDIRECT(cmd))
  452                 notify = in6_rtchange, d = NULL;
  453         else if (cmd == PRC_HOSTDEAD)
  454                 d = NULL;
  455         else if (inet6ctlerrmap[cmd] == 0)
  456                 return;
  457 
  458         /* if the parameter is from icmp6, decode it. */
  459         if (d != NULL) {
  460                 ip6cp = (struct ip6ctlparam *)d;
  461                 m = ip6cp->ip6c_m;
  462                 ip6 = ip6cp->ip6c_ip6;
  463                 off = ip6cp->ip6c_off;
  464                 sa6_src = ip6cp->ip6c_src;
  465         } else {
  466                 m = NULL;
  467                 ip6 = NULL;
  468                 sa6_src = &sa6_any;
  469         }
  470 
  471         if (ip6) {
  472                 /*
  473                  * XXX: We assume that when IPV6 is non NULL,
  474                  * M and OFF are valid.
  475                  */
  476 
  477                 /* check if we can safely examine src and dst ports */
  478                 if (m->m_pkthdr.len < off + sizeof(*uhp))
  479                         return;
  480 
  481                 bzero(&uh, sizeof(uh));
  482                 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
  483 
  484                 (void) in6_pcbnotify(&udb, sa, uh.uh_dport,
  485                                      (struct sockaddr *)ip6cp->ip6c_src, 
  486                                      uh.uh_sport, cmd, notify);
  487         } else
  488                 (void) in6_pcbnotify(&udb, sa, 0,
  489                                      (const struct sockaddr *)sa6_src,
  490                                      0, cmd, notify);
  491 }
  492 
  493 static int
  494 udp6_getcred(SYSCTL_HANDLER_ARGS)
  495 {
  496         struct xucred xuc;
  497         struct sockaddr_in6 addrs[2];
  498         struct inpcb *inp;
  499         int error, s;
  500 
  501         error = suser(req->td);
  502         if (error)
  503                 return (error);
  504 
  505         if (req->newlen != sizeof(addrs))
  506                 return (EINVAL);
  507         if (req->oldlen != sizeof(struct xucred))
  508                 return (EINVAL);
  509         error = SYSCTL_IN(req, addrs, sizeof(addrs));
  510         if (error)
  511                 return (error);
  512         s = splnet();
  513         inp = in6_pcblookup_hash(&udbinfo, &addrs[1].sin6_addr,
  514                                  addrs[1].sin6_port,
  515                                  &addrs[0].sin6_addr, addrs[0].sin6_port,
  516                                  1, NULL);
  517         if (!inp || !inp->inp_socket) {
  518                 error = ENOENT;
  519                 goto out;
  520         }
  521         cru2x(inp->inp_socket->so_cred, &xuc);
  522         error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
  523 out:
  524         splx(s);
  525         return (error);
  526 }
  527 
  528 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
  529             0, 0,
  530             udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection");
  531 
  532 static int
  533 udp6_abort(struct socket *so)
  534 {
  535         struct inpcb *inp;
  536         int s;
  537 
  538         inp = sotoinpcb(so);
  539         if (inp == 0)
  540                 return EINVAL;  /* ??? possible? panic instead? */
  541         soisdisconnected(so);
  542         s = splnet();
  543         in6_pcbdetach(inp);
  544         splx(s);
  545         return 0;
  546 }
  547 
  548 static int
  549 udp6_attach(struct socket *so, int proto, struct thread *td)
  550 {
  551         struct inpcb *inp;
  552         int s, error;
  553 
  554         inp = sotoinpcb(so);
  555         if (inp != 0)
  556                 return EINVAL;
  557 
  558         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
  559                 error = soreserve(so, udp_sendspace, udp_recvspace);
  560                 if (error)
  561                         return error;
  562         }
  563         s = splnet();
  564         error = in_pcballoc(so, &udbinfo, td);
  565         splx(s);
  566         if (error)
  567                 return error;
  568         inp = (struct inpcb *)so->so_pcb;
  569         inp->inp_vflag |= INP_IPV6;
  570         if (!ip6_v6only)
  571                 inp->inp_vflag |= INP_IPV4;
  572         inp->in6p_hops = -1;    /* use kernel default */
  573         inp->in6p_cksum = -1;   /* just to be sure */
  574         /*
  575          * XXX: ugly!!
  576          * IPv4 TTL initialization is necessary for an IPv6 socket as well,
  577          * because the socket may be bound to an IPv6 wildcard address,
  578          * which may match an IPv4-mapped IPv6 address.
  579          */
  580         inp->inp_ip_ttl = ip_defttl;
  581         return 0;
  582 }
  583 
  584 static int
  585 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
  586 {
  587         struct inpcb *inp;
  588         int s, error;
  589 
  590         inp = sotoinpcb(so);
  591         if (inp == 0)
  592                 return EINVAL;
  593 
  594         inp->inp_vflag &= ~INP_IPV4;
  595         inp->inp_vflag |= INP_IPV6;
  596         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
  597                 struct sockaddr_in6 *sin6_p;
  598 
  599                 sin6_p = (struct sockaddr_in6 *)nam;
  600 
  601                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
  602                         inp->inp_vflag |= INP_IPV4;
  603                 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
  604                         struct sockaddr_in sin;
  605 
  606                         in6_sin6_2_sin(&sin, sin6_p);
  607                         inp->inp_vflag |= INP_IPV4;
  608                         inp->inp_vflag &= ~INP_IPV6;
  609                         s = splnet();
  610                         error = in_pcbbind(inp, (struct sockaddr *)&sin, td);
  611                         splx(s);
  612                         return error;
  613                 }
  614         }
  615 
  616         s = splnet();
  617         error = in6_pcbbind(inp, nam, td);
  618         splx(s);
  619         return error;
  620 }
  621 
  622 static int
  623 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
  624 {
  625         struct inpcb *inp;
  626         int s, error;
  627 
  628         inp = sotoinpcb(so);
  629         if (inp == 0)
  630                 return EINVAL;
  631 
  632         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
  633                 struct sockaddr_in6 *sin6_p;
  634 
  635                 sin6_p = (struct sockaddr_in6 *)nam;
  636                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
  637                         struct sockaddr_in sin;
  638 
  639                         if (inp->inp_faddr.s_addr != INADDR_ANY)
  640                                 return EISCONN;
  641                         in6_sin6_2_sin(&sin, sin6_p);
  642                         s = splnet();
  643                         error = in_pcbconnect(inp, (struct sockaddr *)&sin, td);
  644                         splx(s);
  645                         if (error == 0) {
  646                                 inp->inp_vflag |= INP_IPV4;
  647                                 inp->inp_vflag &= ~INP_IPV6;
  648                                 soisconnected(so);
  649                         }
  650                         return error;
  651                 }
  652         }
  653         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
  654                 return EISCONN;
  655         s = splnet();
  656         error = in6_pcbconnect(inp, nam, td);
  657         splx(s);
  658         if (error == 0) {
  659                 if (!ip6_v6only) { /* should be non mapped addr */
  660                         inp->inp_vflag &= ~INP_IPV4;
  661                         inp->inp_vflag |= INP_IPV6;
  662                 }
  663                 soisconnected(so);
  664         }
  665         return error;
  666 }
  667 
  668 static int
  669 udp6_detach(struct socket *so)
  670 {
  671         struct inpcb *inp;
  672         int s;
  673 
  674         inp = sotoinpcb(so);
  675         if (inp == 0)
  676                 return EINVAL;
  677         s = splnet();
  678         in6_pcbdetach(inp);
  679         splx(s);
  680         return 0;
  681 }
  682 
  683 static int
  684 udp6_disconnect(struct socket *so)
  685 {
  686         struct inpcb *inp;
  687         int s;
  688 
  689         inp = sotoinpcb(so);
  690         if (inp == 0)
  691                 return EINVAL;
  692 
  693         if (inp->inp_vflag & INP_IPV4) {
  694                 struct pr_usrreqs *pru;
  695 
  696                 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
  697                 return ((*pru->pru_disconnect)(so));
  698         }
  699 
  700         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
  701                 return ENOTCONN;
  702 
  703         s = splnet();
  704         in6_pcbdisconnect(inp);
  705         inp->in6p_laddr = in6addr_any;
  706         splx(s);
  707         so->so_state &= ~SS_ISCONNECTED;                /* XXX */
  708         return 0;
  709 }
  710 
  711 static int
  712 udp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
  713           struct mbuf *control, struct thread *td)
  714 {
  715         struct inpcb *inp;
  716         int error = 0;
  717 
  718         inp = sotoinpcb(so);
  719         if (inp == 0) {
  720                 error = EINVAL;
  721                 goto bad;
  722         }
  723 
  724         if (addr) {
  725                 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 
  726                         error = EINVAL;
  727                         goto bad;
  728                 }
  729                 if (addr->sa_family != AF_INET6) {
  730                         error = EAFNOSUPPORT;
  731                         goto bad;
  732                 }
  733         }
  734 
  735         if (!ip6_v6only) {
  736                 int hasv4addr;
  737                 struct sockaddr_in6 *sin6 = 0;
  738 
  739                 if (addr == 0)
  740                         hasv4addr = (inp->inp_vflag & INP_IPV4);
  741                 else {
  742                         sin6 = (struct sockaddr_in6 *)addr;
  743                         hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
  744                                 ? 1 : 0;
  745                 }
  746                 if (hasv4addr) {
  747                         struct pr_usrreqs *pru;
  748 
  749                         if (sin6)
  750                                 in6_sin6_2_sin_in_sock(addr);
  751                         pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
  752                         error = ((*pru->pru_send)(so, flags, m, addr, control,
  753                                                   td));
  754                         /* addr will just be freed in sendit(). */
  755                         return error;
  756                 }
  757         }
  758 
  759         return udp6_output(inp, m, addr, control, td);
  760 
  761   bad:
  762         m_freem(m);
  763         return(error);
  764 }
  765 
  766 struct pr_usrreqs udp6_usrreqs = {
  767         udp6_abort, pru_accept_notsupp, udp6_attach, udp6_bind, udp6_connect,
  768         pru_connect2_notsupp, in6_control, udp6_detach, udp6_disconnect,
  769         pru_listen_notsupp, in6_mapped_peeraddr, pru_rcvd_notsupp,
  770         pru_rcvoob_notsupp, udp6_send, pru_sense_null, udp_shutdown,
  771         in6_mapped_sockaddr, sosend, soreceive, sopoll
  772 };

Cache object: 865963da084c621706ed865b15d5e404


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