The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netinet6/udp6_usrreq.c

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    1 /*-
    2  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. Neither the name of the project nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      $KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 jinmei Exp $
   30  *      $KAME: udp6_output.c,v 1.31 2001/05/21 16:39:15 jinmei Exp $
   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  * 4. Neither the name of the University nor the names of its contributors
   46  *    may be used to endorse or promote products derived from this software
   47  *    without specific prior written permission.
   48  *
   49  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   50  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   51  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   52  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   53  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   54  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   55  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   56  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   57  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   58  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   59  * SUCH DAMAGE.
   60  *
   61  *      @(#)udp_usrreq.c        8.6 (Berkeley) 5/23/95
   62  */
   63 
   64 #include <sys/cdefs.h>
   65 __FBSDID("$FreeBSD$");
   66 
   67 #include "opt_inet.h"
   68 #include "opt_inet6.h"
   69 #include "opt_ipsec.h"
   70 
   71 #include <sys/param.h>
   72 #include <sys/errno.h>
   73 #include <sys/kernel.h>
   74 #include <sys/lock.h>
   75 #include <sys/mbuf.h>
   76 #include <sys/proc.h>
   77 #include <sys/protosw.h>
   78 #include <sys/signalvar.h>
   79 #include <sys/socket.h>
   80 #include <sys/socketvar.h>
   81 #include <sys/stat.h>
   82 #include <sys/sx.h>
   83 #include <sys/sysctl.h>
   84 #include <sys/syslog.h>
   85 #include <sys/systm.h>
   86 
   87 #include <net/if.h>
   88 #include <net/if_types.h>
   89 #include <net/route.h>
   90 
   91 #include <netinet/in.h>
   92 #include <netinet/in_pcb.h>
   93 #include <netinet/in_systm.h>
   94 #include <netinet/in_var.h>
   95 #include <netinet/ip.h>
   96 #include <netinet/ip6.h>
   97 #include <netinet/icmp6.h>
   98 #include <netinet/ip_var.h>
   99 #include <netinet/udp.h>
  100 #include <netinet/udp_var.h>
  101 #include <netinet6/ip6protosw.h>
  102 #include <netinet6/ip6_var.h>
  103 #include <netinet6/in6_pcb.h>
  104 #include <netinet6/udp6_var.h>
  105 #include <netinet6/scope6_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 udp6_detach __P((struct socket *so));
  124 
  125 int
  126 udp6_input(mp, offp, proto)
  127         struct mbuf **mp;
  128         int *offp, proto;
  129 {
  130         struct mbuf *m = *mp, *opts;
  131         register struct ip6_hdr *ip6;
  132         register struct udphdr *uh;
  133         register struct inpcb *in6p;
  134         int off = *offp;
  135         int plen, ulen;
  136         struct sockaddr_in6 fromsa;
  137 
  138         opts = NULL;
  139 
  140         ip6 = mtod(m, struct ip6_hdr *);
  141 
  142         if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
  143                 /* XXX send icmp6 host/port unreach? */
  144                 m_freem(m);
  145                 return IPPROTO_DONE;
  146         }
  147 
  148 #ifndef PULLDOWN_TEST
  149         IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
  150         ip6 = mtod(m, struct ip6_hdr *);
  151         uh = (struct udphdr *)((caddr_t)ip6 + off);
  152 #else
  153         IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh));
  154         if (!uh)
  155                 return IPPROTO_DONE;
  156 #endif
  157 
  158         udpstat.udps_ipackets++;
  159 
  160         plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
  161         ulen = ntohs((u_short)uh->uh_ulen);
  162 
  163         if (plen != ulen) {
  164                 udpstat.udps_badlen++;
  165                 goto bad;
  166         }
  167 
  168         /*
  169          * Checksum extended UDP header and data.
  170          */
  171         if (uh->uh_sum == 0) {
  172                 udpstat.udps_nosum++;
  173                 goto bad;
  174         }
  175         if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
  176                 udpstat.udps_badsum++;
  177                 goto bad;
  178         }
  179 
  180         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
  181                 struct  inpcb *last;
  182 
  183                 /*
  184                  * Deliver a multicast datagram to all sockets
  185                  * for which the local and remote addresses and ports match
  186                  * those of the incoming datagram.  This allows more than
  187                  * one process to receive multicasts on the same port.
  188                  * (This really ought to be done for unicast datagrams as
  189                  * well, but that would cause problems with existing
  190                  * applications that open both address-specific sockets and
  191                  * a wildcard socket listening to the same port -- they would
  192                  * end up receiving duplicates of every unicast datagram.
  193                  * Those applications open the multiple sockets to overcome an
  194                  * inadequacy of the UDP socket interface, but for backwards
  195                  * compatibility we avoid the problem here rather than
  196                  * fixing the interface.  Maybe 4.5BSD will remedy this?)
  197                  */
  198 
  199                 /*
  200                  * In a case that laddr should be set to the link-local
  201                  * address (this happens in RIPng), the multicast address
  202                  * specified in the received packet does not match with
  203                  * laddr. To cure this situation, the matching is relaxed
  204                  * if the receiving interface is the same as one specified
  205                  * in the socket and if the destination multicast address
  206                  * matches one of the multicast groups specified in the socket.
  207                  */
  208 
  209                 /*
  210                  * Construct sockaddr format source address.
  211                  */
  212                 init_sin6(&fromsa, m);
  213                 fromsa.sin6_port = uh->uh_sport;
  214                 /*
  215                  * KAME note: traditionally we dropped udpiphdr from mbuf here.
  216                  * We need udphdr for IPsec processing so we do that later.
  217                  */
  218 
  219                 /*
  220                  * Locate pcb(s) for datagram.
  221                  * (Algorithm copied from raw_intr().)
  222                  */
  223                 last = NULL;
  224                 LIST_FOREACH(in6p, &udb, inp_list) {
  225                         if ((in6p->inp_vflag & INP_IPV6) == 0)
  226                                 continue;
  227                         if (in6p->in6p_lport != uh->uh_dport)
  228                                 continue;
  229                         if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
  230                                 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
  231                                                         &ip6->ip6_dst))
  232                                         continue;
  233                         }
  234                         if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
  235                                 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
  236                                                         &ip6->ip6_src) ||
  237                                     in6p->in6p_fport != uh->uh_sport)
  238                                         continue;
  239                         }
  240 
  241                         if (last != NULL) {
  242                                 struct mbuf *n;
  243 
  244 #if defined(IPSEC) || defined(FAST_IPSEC)
  245                                 /*
  246                                  * Check AH/ESP integrity.
  247                                  */
  248                                 if (ipsec6_in_reject(m, last)) {
  249 #ifdef IPSEC
  250                                         ipsec6stat.in_polvio++;
  251 #endif /* IPSEC */
  252                                         /* do not inject data into pcb */
  253                                 } else
  254 #endif /*IPSEC || FAST_IPSEC*/
  255                                 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
  256                                         /*
  257                                          * KAME NOTE: do not
  258                                          * m_copy(m, offset, ...) above.
  259                                          * sbappendaddr() expects M_PKTHDR,
  260                                          * and m_copy() will copy M_PKTHDR
  261                                          * only if offset is 0.
  262                                          */
  263                                         if (last->in6p_flags & IN6P_CONTROLOPTS
  264                                             || last->in6p_socket->so_options & SO_TIMESTAMP)
  265                                                 ip6_savecontrol(last, n, &opts);
  266 
  267                                         m_adj(n, off + sizeof(struct udphdr));
  268                                         if (sbappendaddr(&last->in6p_socket->so_rcv,
  269                                                         (struct sockaddr *)&fromsa,
  270                                                         n, opts) == 0) {
  271                                                 m_freem(n);
  272                                                 if (opts)
  273                                                         m_freem(opts);
  274                                                 udpstat.udps_fullsock++;
  275                                         } else
  276                                                 sorwakeup(last->in6p_socket);
  277                                         opts = NULL;
  278                                 }
  279                         }
  280                         last = in6p;
  281                         /*
  282                          * Don't look for additional matches if this one does
  283                          * not have either the SO_REUSEPORT or SO_REUSEADDR
  284                          * socket options set.  This heuristic avoids searching
  285                          * through all pcbs in the common case of a non-shared
  286                          * port.  It assumes that an application will never
  287                          * clear these options after setting them.
  288                          */
  289                         if ((last->in6p_socket->so_options &
  290                              (SO_REUSEPORT|SO_REUSEADDR)) == 0)
  291                                 break;
  292                 }
  293 
  294                 if (last == NULL) {
  295                         /*
  296                          * No matching pcb found; discard datagram.
  297                          * (No need to send an ICMP Port Unreachable
  298                          * for a broadcast or multicast datgram.)
  299                          */
  300                         udpstat.udps_noport++;
  301                         udpstat.udps_noportmcast++;
  302                         goto bad;
  303                 }
  304 #if defined(IPSEC) || defined(FAST_IPSEC)
  305                 /*
  306                  * Check AH/ESP integrity.
  307                  */
  308                 if (ipsec6_in_reject(m, last)) {
  309 #ifdef IPSEC
  310                         ipsec6stat.in_polvio++;
  311 #endif /* IPSEC */
  312                         goto bad;
  313                 }
  314 #endif /*IPSEC || FAST_IPSEC*/
  315                 if (last->in6p_flags & IN6P_CONTROLOPTS
  316                     || last->in6p_socket->so_options & SO_TIMESTAMP)
  317                         ip6_savecontrol(last, m, &opts);
  318 
  319                 m_adj(m, off + sizeof(struct udphdr));
  320                 if (sbappendaddr(&last->in6p_socket->so_rcv,
  321                                 (struct sockaddr *)&fromsa,
  322                                 m, opts) == 0) {
  323                         udpstat.udps_fullsock++;
  324                         goto bad;
  325                 }
  326                 sorwakeup(last->in6p_socket);
  327                 return IPPROTO_DONE;
  328         }
  329         /*
  330          * Locate pcb for datagram.
  331          */
  332         in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport,
  333                                   &ip6->ip6_dst, uh->uh_dport, 1,
  334                                   m->m_pkthdr.rcvif);
  335         if (in6p == 0) {
  336                 if (log_in_vain) {
  337                         char buf[INET6_ADDRSTRLEN];
  338 
  339                         strcpy(buf, ip6_sprintf(&ip6->ip6_dst));
  340                         log(LOG_INFO,
  341                             "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
  342                             buf, ntohs(uh->uh_dport),
  343                             ip6_sprintf(&ip6->ip6_src), ntohs(uh->uh_sport));
  344                 }
  345                 udpstat.udps_noport++;
  346                 if (m->m_flags & M_MCAST) {
  347                         printf("UDP6: M_MCAST is set in a unicast packet.\n");
  348                         udpstat.udps_noportmcast++;
  349                         goto bad;
  350                 }
  351                 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
  352                 return IPPROTO_DONE;
  353         }
  354 #if defined(IPSEC) || defined(FAST_IPSEC)
  355         /*
  356          * Check AH/ESP integrity.
  357          */
  358         if (ipsec6_in_reject(m, in6p)) {
  359 #ifdef IPSEC
  360                 ipsec6stat.in_polvio++;
  361 #endif /* IPSEC */
  362                 goto bad;
  363         }
  364 #endif /*IPSEC || FAST_IPSEC*/
  365 
  366         /*
  367          * Construct sockaddr format source address.
  368          * Stuff source address and datagram in user buffer.
  369          */
  370         init_sin6(&fromsa, m);
  371         fromsa.sin6_port = uh->uh_sport;
  372         if (in6p->in6p_flags & IN6P_CONTROLOPTS
  373             || in6p->in6p_socket->so_options & SO_TIMESTAMP)
  374                 ip6_savecontrol(in6p, m, &opts);
  375         m_adj(m, off + sizeof(struct udphdr));
  376         if (sbappendaddr(&in6p->in6p_socket->so_rcv,
  377                         (struct sockaddr *)&fromsa, m, opts) == 0) {
  378                 udpstat.udps_fullsock++;
  379                 goto bad;
  380         }
  381         sorwakeup(in6p->in6p_socket);
  382         return IPPROTO_DONE;
  383 bad:
  384         if (m)
  385                 m_freem(m);
  386         if (opts)
  387                 m_freem(opts);
  388         return IPPROTO_DONE;
  389 }
  390 
  391 void
  392 udp6_ctlinput(cmd, sa, d)
  393         int cmd;
  394         struct sockaddr *sa;
  395         void *d;
  396 {
  397         struct udphdr uh;
  398         struct ip6_hdr *ip6;
  399         struct mbuf *m;
  400         int off = 0;
  401         struct ip6ctlparam *ip6cp = NULL;
  402         const struct sockaddr_in6 *sa6_src = NULL;
  403         void *cmdarg;
  404         struct inpcb *(*notify)(struct inpcb *, int) = udp_notify;
  405         struct udp_portonly {
  406                 u_int16_t uh_sport;
  407                 u_int16_t uh_dport;
  408         } *uhp;
  409 
  410         if (sa->sa_family != AF_INET6 ||
  411             sa->sa_len != sizeof(struct sockaddr_in6))
  412                 return;
  413 
  414         if ((unsigned)cmd >= PRC_NCMDS)
  415                 return;
  416         if (PRC_IS_REDIRECT(cmd))
  417                 notify = in6_rtchange, d = NULL;
  418         else if (cmd == PRC_HOSTDEAD)
  419                 d = NULL;
  420         else if (inet6ctlerrmap[cmd] == 0)
  421                 return;
  422 
  423         /* if the parameter is from icmp6, decode it. */
  424         if (d != NULL) {
  425                 ip6cp = (struct ip6ctlparam *)d;
  426                 m = ip6cp->ip6c_m;
  427                 ip6 = ip6cp->ip6c_ip6;
  428                 off = ip6cp->ip6c_off;
  429                 cmdarg = ip6cp->ip6c_cmdarg;
  430                 sa6_src = ip6cp->ip6c_src;
  431         } else {
  432                 m = NULL;
  433                 ip6 = NULL;
  434                 cmdarg = NULL;
  435                 sa6_src = &sa6_any;
  436         }
  437 
  438         if (ip6) {
  439                 /*
  440                  * XXX: We assume that when IPV6 is non NULL,
  441                  * M and OFF are valid.
  442                  */
  443 
  444                 /* check if we can safely examine src and dst ports */
  445                 if (m->m_pkthdr.len < off + sizeof(*uhp))
  446                         return;
  447 
  448                 bzero(&uh, sizeof(uh));
  449                 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
  450 
  451                 (void) in6_pcbnotify(&udbinfo, sa, uh.uh_dport,
  452                                      (struct sockaddr *)ip6cp->ip6c_src,
  453                                      uh.uh_sport, cmd, cmdarg, notify);
  454         } else
  455                 (void) in6_pcbnotify(&udbinfo, sa, 0,
  456                                      (const struct sockaddr *)sa6_src,
  457                                      0, cmd, cmdarg, notify);
  458 }
  459 
  460 static int
  461 udp6_getcred(SYSCTL_HANDLER_ARGS)
  462 {
  463         struct xucred xuc;
  464         struct sockaddr_in6 addrs[2];
  465         struct inpcb *inp;
  466         int error, s;
  467 
  468         error = suser(req->td);
  469         if (error)
  470                 return (error);
  471 
  472         if (req->newlen != sizeof(addrs))
  473                 return (EINVAL);
  474         if (req->oldlen != sizeof(struct xucred))
  475                 return (EINVAL);
  476         error = SYSCTL_IN(req, addrs, sizeof(addrs));
  477         if (error)
  478                 return (error);
  479         if ((error = sa6_embedscope(&addrs[0], ip6_use_defzone)) != 0 ||
  480             (error = sa6_embedscope(&addrs[1], ip6_use_defzone)) != 0) {
  481                 return (error);
  482         }
  483         s = splnet();
  484         inp = in6_pcblookup_hash(&udbinfo, &addrs[1].sin6_addr,
  485                                  addrs[1].sin6_port,
  486                                  &addrs[0].sin6_addr, addrs[0].sin6_port,
  487                                  1, NULL);
  488         if (!inp || !inp->inp_socket) {
  489                 error = ENOENT;
  490                 goto out;
  491         }
  492         cru2x(inp->inp_socket->so_cred, &xuc);
  493         error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
  494 out:
  495         splx(s);
  496         return (error);
  497 }
  498 
  499 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
  500             0, 0,
  501             udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection");
  502 
  503 static int
  504 udp6_abort(struct socket *so)
  505 {
  506         struct inpcb *inp;
  507         int s;
  508 
  509         INP_INFO_WLOCK(&udbinfo);
  510         inp = sotoinpcb(so);
  511         if (inp == 0) {
  512                 INP_INFO_WUNLOCK(&udbinfo);
  513                 return EINVAL;  /* ??? possible? panic instead? */
  514         }
  515         soisdisconnected(so);
  516         s = splnet();
  517         INP_LOCK(inp);
  518         in6_pcbdetach(inp);
  519         INP_INFO_WUNLOCK(&udbinfo);
  520         splx(s);
  521         return 0;
  522 }
  523 
  524 static int
  525 udp6_attach(struct socket *so, int proto, struct thread *td)
  526 {
  527         struct inpcb *inp;
  528         int s, error;
  529 
  530         INP_INFO_WLOCK(&udbinfo);
  531         inp = sotoinpcb(so);
  532         if (inp != 0) {
  533                 INP_INFO_WUNLOCK(&udbinfo);
  534                 return EINVAL;
  535         }
  536 
  537         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
  538                 error = soreserve(so, udp_sendspace, udp_recvspace);
  539                 if (error) {
  540                         INP_INFO_WUNLOCK(&udbinfo);
  541                         return error;
  542                 }
  543         }
  544         s = splnet();
  545         error = in_pcballoc(so, &udbinfo);
  546         splx(s);
  547         if (error) {
  548                 INP_INFO_WUNLOCK(&udbinfo);
  549                 return error;
  550         }
  551         inp = (struct inpcb *)so->so_pcb;
  552         INP_INFO_WUNLOCK(&udbinfo);
  553         inp->inp_vflag |= INP_IPV6;
  554         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
  555                 inp->inp_vflag |= INP_IPV4;
  556         inp->in6p_hops = -1;    /* use kernel default */
  557         inp->in6p_cksum = -1;   /* just to be sure */
  558         /*
  559          * XXX: ugly!!
  560          * IPv4 TTL initialization is necessary for an IPv6 socket as well,
  561          * because the socket may be bound to an IPv6 wildcard address,
  562          * which may match an IPv4-mapped IPv6 address.
  563          */
  564         inp->inp_ip_ttl = ip_defttl;
  565         INP_UNLOCK(inp);
  566         return 0;
  567 }
  568 
  569 static int
  570 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
  571 {
  572         struct inpcb *inp;
  573         int s, error;
  574 
  575         INP_INFO_WLOCK(&udbinfo);
  576         inp = sotoinpcb(so);
  577         if (inp == 0) {
  578                 INP_INFO_WUNLOCK(&udbinfo);
  579                 return EINVAL;
  580         }
  581         INP_LOCK(inp);
  582 
  583         inp->inp_vflag &= ~INP_IPV4;
  584         inp->inp_vflag |= INP_IPV6;
  585         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
  586                 struct sockaddr_in6 *sin6_p;
  587 
  588                 sin6_p = (struct sockaddr_in6 *)nam;
  589 
  590                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
  591                         inp->inp_vflag |= INP_IPV4;
  592                 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
  593                         struct sockaddr_in sin;
  594 
  595                         in6_sin6_2_sin(&sin, sin6_p);
  596                         inp->inp_vflag |= INP_IPV4;
  597                         inp->inp_vflag &= ~INP_IPV6;
  598                         s = splnet();
  599                         error = in_pcbbind(inp, (struct sockaddr *)&sin,
  600                             td->td_ucred);
  601                         goto out;
  602                 }
  603         }
  604 
  605         s = splnet();
  606         error = in6_pcbbind(inp, nam, td->td_ucred);
  607 out:
  608         INP_UNLOCK(inp);
  609         INP_INFO_WUNLOCK(&udbinfo);
  610         splx(s);
  611         return error;
  612 }
  613 
  614 static int
  615 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
  616 {
  617         struct inpcb *inp;
  618         int s, error;
  619 
  620         INP_INFO_WLOCK(&udbinfo);
  621         inp = sotoinpcb(so);
  622         if (inp == 0) {
  623                 INP_INFO_WUNLOCK(&udbinfo);
  624                 return EINVAL;
  625         }
  626         INP_LOCK(inp);
  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,
  640                             td->td_ucred);
  641                         splx(s);
  642                         if (error == 0) {
  643                                 inp->inp_vflag |= INP_IPV4;
  644                                 inp->inp_vflag &= ~INP_IPV6;
  645                                 soisconnected(so);
  646                         }
  647                         goto out;
  648                 }
  649         }
  650         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
  651                 error = EISCONN;
  652                 goto out;
  653         }
  654         s = splnet();
  655         error = in6_pcbconnect(inp, nam, td->td_ucred);
  656         splx(s);
  657         if (error == 0) {
  658                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
  659                         /* should be non mapped addr */
  660                         inp->inp_vflag &= ~INP_IPV4;
  661                         inp->inp_vflag |= INP_IPV6;
  662                 }
  663                 soisconnected(so);
  664         }
  665 out:
  666         INP_UNLOCK(inp);
  667         INP_INFO_WUNLOCK(&udbinfo);
  668         return error;
  669 }
  670 
  671 static int
  672 udp6_detach(struct socket *so)
  673 {
  674         struct inpcb *inp;
  675         int s;
  676 
  677         INP_INFO_WLOCK(&udbinfo);
  678         inp = sotoinpcb(so);
  679         if (inp == 0) {
  680                 INP_INFO_WUNLOCK(&udbinfo);
  681                 return EINVAL;
  682         }
  683         INP_LOCK(inp);
  684         s = splnet();
  685         in6_pcbdetach(inp);
  686         splx(s);
  687         INP_INFO_WUNLOCK(&udbinfo);
  688         return 0;
  689 }
  690 
  691 static int
  692 udp6_disconnect(struct socket *so)
  693 {
  694         struct inpcb *inp;
  695         int error, s;
  696 
  697         INP_INFO_WLOCK(&udbinfo);
  698         inp = sotoinpcb(so);
  699         if (inp == 0) {
  700                 INP_INFO_WUNLOCK(&udbinfo);
  701                 return EINVAL;
  702         }
  703         INP_LOCK(inp);
  704 
  705 #ifdef INET
  706         if (inp->inp_vflag & INP_IPV4) {
  707                 struct pr_usrreqs *pru;
  708 
  709                 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
  710                 error = (*pru->pru_disconnect)(so);
  711                 goto out;
  712         }
  713 #endif
  714 
  715         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
  716                 error = ENOTCONN;
  717                 goto out;
  718         }
  719 
  720         s = splnet();
  721         in6_pcbdisconnect(inp);
  722         inp->in6p_laddr = in6addr_any;
  723         splx(s);
  724         /* XXXRW: so_state locking? */
  725         so->so_state &= ~SS_ISCONNECTED;                /* XXX */
  726 out:
  727         INP_UNLOCK(inp);
  728         INP_INFO_WUNLOCK(&udbinfo);
  729         return 0;
  730 }
  731 
  732 static int
  733 udp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
  734           struct mbuf *control, struct thread *td)
  735 {
  736         struct inpcb *inp;
  737         int error = 0;
  738 
  739         INP_INFO_WLOCK(&udbinfo);
  740         inp = sotoinpcb(so);
  741         if (inp == 0) {
  742                 INP_INFO_WUNLOCK(&udbinfo);
  743                 m_freem(m);
  744                 return EINVAL;
  745         }
  746         INP_LOCK(inp);
  747 
  748         if (addr) {
  749                 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 
  750                         error = EINVAL;
  751                         goto bad;
  752                 }
  753                 if (addr->sa_family != AF_INET6) {
  754                         error = EAFNOSUPPORT;
  755                         goto bad;
  756                 }
  757         }
  758 
  759 #ifdef INET
  760         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
  761                 int hasv4addr;
  762                 struct sockaddr_in6 *sin6 = 0;
  763 
  764                 if (addr == 0)
  765                         hasv4addr = (inp->inp_vflag & INP_IPV4);
  766                 else {
  767                         sin6 = (struct sockaddr_in6 *)addr;
  768                         hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
  769                                 ? 1 : 0;
  770                 }
  771                 if (hasv4addr) {
  772                         struct pr_usrreqs *pru;
  773 
  774                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
  775                             !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) {
  776                                 /*
  777                                  * when remote addr is IPv4-mapped
  778                                  * address, local addr should not be
  779                                  * an IPv6 address; since you cannot
  780                                  * determine how to map IPv6 source
  781                                  * address to IPv4.
  782                                  */
  783                                 error = EINVAL;
  784                                 goto out;
  785                         }
  786                         if (sin6)
  787                                 in6_sin6_2_sin_in_sock(addr);
  788                         pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
  789                         error = ((*pru->pru_send)(so, flags, m, addr, control,
  790                                                   td));
  791                         /* addr will just be freed in sendit(). */
  792                         goto out;
  793                 }
  794         }
  795 #endif
  796 
  797         error = udp6_output(inp, m, addr, control, td);
  798 out:
  799         INP_UNLOCK(inp);
  800         INP_INFO_WUNLOCK(&udbinfo);
  801         return error;
  802 
  803   bad:
  804         INP_UNLOCK(inp);
  805         INP_INFO_WUNLOCK(&udbinfo);
  806         m_freem(m);
  807         return (error);
  808 }
  809 
  810 struct pr_usrreqs udp6_usrreqs = {
  811         .pru_abort =            udp6_abort,
  812         .pru_attach =           udp6_attach,
  813         .pru_bind =             udp6_bind,
  814         .pru_connect =          udp6_connect,
  815         .pru_control =          in6_control,
  816         .pru_detach =           udp6_detach,
  817         .pru_disconnect =       udp6_disconnect,
  818         .pru_peeraddr =         in6_mapped_peeraddr,
  819         .pru_send =             udp6_send,
  820         .pru_shutdown =         udp_shutdown,
  821         .pru_sockaddr =         in6_mapped_sockaddr,
  822         .pru_sosetlabel =       in_pcbsosetlabel
  823 };

Cache object: 516d6ca6758ad4e5bc835f4dbdaf4cfb


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