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


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

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

Version: -  FREEBSD  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-2  -  FREEBSD-11-1  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-4  -  FREEBSD-10-3  -  FREEBSD-10-2  -  FREEBSD-10-1  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-3  -  FREEBSD-9-2  -  FREEBSD-9-1  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-4  -  FREEBSD-8-3  -  FREEBSD-8-2  -  FREEBSD-8-1  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-4  -  FREEBSD-7-3  -  FREEBSD-7-2  -  FREEBSD-7-1  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-4  -  FREEBSD-6-3  -  FREEBSD-6-2  -  FREEBSD-6-1  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-5  -  FREEBSD-5-4  -  FREEBSD-5-3  -  FREEBSD-5-2  -  FREEBSD-5-1  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  linux-2.6  -  linux-2.4.22  -  MK83  -  MK84  -  PLAN9  -  DFBSD  -  NETBSD  -  NETBSD5  -  NETBSD4  -  NETBSD3  -  NETBSD20  -  OPENBSD  -  xnu-517  -  xnu-792  -  xnu-792.6.70  -  xnu-1228  -  xnu-1456.1.26  -  xnu-1699.24.8  -  xnu-2050.18.24  -  OPENSOLARIS  -  minix-3-1-1 
SearchContext: -  none  -  3  -  10 

    1 /*-
    2  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    3  * Copyright (c) 2010-2011 Juniper Networks, Inc.
    4  * All rights reserved.
    5  *
    6  * Portions of this software were developed by Robert N. M. Watson under
    7  * contract to Juniper Networks, Inc.
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  * 3. Neither the name of the project nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      $KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 jinmei Exp $
   34  *      $KAME: udp6_output.c,v 1.31 2001/05/21 16:39:15 jinmei Exp $
   35  */
   36 
   37 /*-
   38  * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
   39  *      The Regents of the University of California.
   40  * All rights reserved.
   41  *
   42  * Redistribution and use in source and binary forms, with or without
   43  * modification, are permitted provided that the following conditions
   44  * are met:
   45  * 1. Redistributions of source code must retain the above copyright
   46  *    notice, this list of conditions and the following disclaimer.
   47  * 2. Redistributions in binary form must reproduce the above copyright
   48  *    notice, this list of conditions and the following disclaimer in the
   49  *    documentation and/or other materials provided with the distribution.
   50  * 4. Neither the name of the University nor the names of its contributors
   51  *    may be used to endorse or promote products derived from this software
   52  *    without specific prior written permission.
   53  *
   54  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   55  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   56  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   57  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   58  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   59  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   60  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   61  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   62  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   63  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   64  * SUCH DAMAGE.
   65  *
   66  *      @(#)udp_usrreq.c        8.6 (Berkeley) 5/23/95
   67  */
   68 
   69 #include <sys/cdefs.h>
   70 __FBSDID("$FreeBSD: releng/9.1/sys/netinet6/udp6_usrreq.c 238247 2012-07-08 14:21:36Z bz $");
   71 
   72 #include "opt_inet.h"
   73 #include "opt_inet6.h"
   74 #include "opt_ipfw.h"
   75 #include "opt_ipsec.h"
   76 
   77 #include <sys/param.h>
   78 #include <sys/jail.h>
   79 #include <sys/kernel.h>
   80 #include <sys/lock.h>
   81 #include <sys/mbuf.h>
   82 #include <sys/priv.h>
   83 #include <sys/proc.h>
   84 #include <sys/protosw.h>
   85 #include <sys/signalvar.h>
   86 #include <sys/socket.h>
   87 #include <sys/socketvar.h>
   88 #include <sys/sx.h>
   89 #include <sys/sysctl.h>
   90 #include <sys/syslog.h>
   91 #include <sys/systm.h>
   92 
   93 #include <net/if.h>
   94 #include <net/if_types.h>
   95 #include <net/route.h>
   96 
   97 #include <netinet/in.h>
   98 #include <netinet/in_pcb.h>
   99 #include <netinet/in_systm.h>
  100 #include <netinet/in_var.h>
  101 #include <netinet/ip.h>
  102 #include <netinet/ip_icmp.h>
  103 #include <netinet/ip6.h>
  104 #include <netinet/icmp_var.h>
  105 #include <netinet/icmp6.h>
  106 #include <netinet/ip_var.h>
  107 #include <netinet/udp.h>
  108 #include <netinet/udp_var.h>
  109 
  110 #include <netinet6/ip6protosw.h>
  111 #include <netinet6/ip6_var.h>
  112 #include <netinet6/in6_pcb.h>
  113 #include <netinet6/udp6_var.h>
  114 #include <netinet6/scope6_var.h>
  115 
  116 #ifdef IPSEC
  117 #include <netipsec/ipsec.h>
  118 #include <netipsec/ipsec6.h>
  119 #endif /* IPSEC */
  120 
  121 #include <security/mac/mac_framework.h>
  122 
  123 /*
  124  * UDP protocol implementation.
  125  * Per RFC 768, August, 1980.
  126  */
  127 
  128 extern struct protosw   inetsw[];
  129 static void             udp6_detach(struct socket *so);
  130 
  131 static void
  132 udp6_append(struct inpcb *inp, struct mbuf *n, int off,
  133     struct sockaddr_in6 *fromsa)
  134 {
  135         struct socket *so;
  136         struct mbuf *opts;
  137 
  138         INP_LOCK_ASSERT(inp);
  139 
  140 #ifdef IPSEC
  141         /* Check AH/ESP integrity. */
  142         if (ipsec6_in_reject(n, inp)) {
  143                 m_freem(n);
  144                 V_ipsec6stat.in_polvio++;
  145                 return;
  146         }
  147 #endif /* IPSEC */
  148 #ifdef MAC
  149         if (mac_inpcb_check_deliver(inp, n) != 0) {
  150                 m_freem(n);
  151                 return;
  152         }
  153 #endif
  154         opts = NULL;
  155         if (inp->inp_flags & INP_CONTROLOPTS ||
  156             inp->inp_socket->so_options & SO_TIMESTAMP)
  157                 ip6_savecontrol(inp, n, &opts);
  158         m_adj(n, off + sizeof(struct udphdr));
  159 
  160         so = inp->inp_socket;
  161         SOCKBUF_LOCK(&so->so_rcv);
  162         if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)fromsa, n,
  163             opts) == 0) {
  164                 SOCKBUF_UNLOCK(&so->so_rcv);
  165                 m_freem(n);
  166                 if (opts)
  167                         m_freem(opts);
  168                 UDPSTAT_INC(udps_fullsock);
  169         } else
  170                 sorwakeup_locked(so);
  171 }
  172 
  173 int
  174 udp6_input(struct mbuf **mp, int *offp, int proto)
  175 {
  176         struct mbuf *m = *mp;
  177         struct ifnet *ifp;
  178         struct ip6_hdr *ip6;
  179         struct udphdr *uh;
  180         struct inpcb *inp;
  181         struct udpcb *up;
  182         int off = *offp;
  183         int plen, ulen;
  184         struct sockaddr_in6 fromsa;
  185 #ifdef IPFIREWALL_FORWARD
  186         struct m_tag *fwd_tag;
  187 #endif
  188         uint16_t uh_sum;
  189 
  190         ifp = m->m_pkthdr.rcvif;
  191         ip6 = mtod(m, struct ip6_hdr *);
  192 
  193         if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
  194                 /* XXX send icmp6 host/port unreach? */
  195                 m_freem(m);
  196                 return (IPPROTO_DONE);
  197         }
  198 
  199 #ifndef PULLDOWN_TEST
  200         IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
  201         ip6 = mtod(m, struct ip6_hdr *);
  202         uh = (struct udphdr *)((caddr_t)ip6 + off);
  203 #else
  204         IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh));
  205         if (!uh)
  206                 return (IPPROTO_DONE);
  207 #endif
  208 
  209         UDPSTAT_INC(udps_ipackets);
  210 
  211         /*
  212          * Destination port of 0 is illegal, based on RFC768.
  213          */
  214         if (uh->uh_dport == 0)
  215                 goto badunlocked;
  216 
  217         plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
  218         ulen = ntohs((u_short)uh->uh_ulen);
  219 
  220         if (plen != ulen) {
  221                 UDPSTAT_INC(udps_badlen);
  222                 goto badunlocked;
  223         }
  224 
  225         /*
  226          * Checksum extended UDP header and data.
  227          */
  228         if (uh->uh_sum == 0) {
  229                 UDPSTAT_INC(udps_nosum);
  230                 goto badunlocked;
  231         }
  232 
  233         if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID_IPV6) {
  234                 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
  235                         uh_sum = m->m_pkthdr.csum_data;
  236                 else
  237                         uh_sum = in6_cksum_pseudo(ip6, ulen,
  238                             IPPROTO_UDP, m->m_pkthdr.csum_data);
  239                 uh_sum ^= 0xffff;
  240         } else
  241                 uh_sum = in6_cksum(m, IPPROTO_UDP, off, ulen);
  242 
  243         if (uh_sum != 0) {
  244                 UDPSTAT_INC(udps_badsum);
  245                 goto badunlocked;
  246         }
  247 
  248         /*
  249          * Construct sockaddr format source address.
  250          */
  251         init_sin6(&fromsa, m);
  252         fromsa.sin6_port = uh->uh_sport;
  253 
  254         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
  255                 struct inpcb *last;
  256                 struct ip6_moptions *imo;
  257 
  258                 INP_INFO_RLOCK(&V_udbinfo);
  259                 /*
  260                  * In the event that laddr should be set to the link-local
  261                  * address (this happens in RIPng), the multicast address
  262                  * specified in the received packet will not match laddr.  To
  263                  * handle this situation, matching is relaxed if the
  264                  * receiving interface is the same as one specified in the
  265                  * socket and if the destination multicast address matches
  266                  * one of the multicast groups specified in the socket.
  267                  */
  268 
  269                 /*
  270                  * KAME note: traditionally we dropped udpiphdr from mbuf
  271                  * here.  We need udphdr for IPsec processing so we do that
  272                  * later.
  273                  */
  274                 last = NULL;
  275                 LIST_FOREACH(inp, &V_udb, inp_list) {
  276                         if ((inp->inp_vflag & INP_IPV6) == 0)
  277                                 continue;
  278                         if (inp->inp_lport != uh->uh_dport)
  279                                 continue;
  280                         if (inp->inp_fport != 0 &&
  281                             inp->inp_fport != uh->uh_sport)
  282                                 continue;
  283                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
  284                                 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
  285                                                         &ip6->ip6_dst))
  286                                         continue;
  287                         }
  288                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
  289                                 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
  290                                                         &ip6->ip6_src) ||
  291                                     inp->inp_fport != uh->uh_sport)
  292                                         continue;
  293                         }
  294 
  295                         /*
  296                          * XXXRW: Because we weren't holding either the inpcb
  297                          * or the hash lock when we checked for a match 
  298                          * before, we should probably recheck now that the 
  299                          * inpcb lock is (supposed to be) held.
  300                          */
  301 
  302                         /*
  303                          * Handle socket delivery policy for any-source
  304                          * and source-specific multicast. [RFC3678]
  305                          */
  306                         imo = inp->in6p_moptions;
  307                         if (imo && IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
  308                                 struct sockaddr_in6      mcaddr;
  309                                 int                      blocked;
  310 
  311                                 INP_RLOCK(inp);
  312 
  313                                 bzero(&mcaddr, sizeof(struct sockaddr_in6));
  314                                 mcaddr.sin6_len = sizeof(struct sockaddr_in6);
  315                                 mcaddr.sin6_family = AF_INET6;
  316                                 mcaddr.sin6_addr = ip6->ip6_dst;
  317 
  318                                 blocked = im6o_mc_filter(imo, ifp,
  319                                         (struct sockaddr *)&mcaddr,
  320                                         (struct sockaddr *)&fromsa);
  321                                 if (blocked != MCAST_PASS) {
  322                                         if (blocked == MCAST_NOTGMEMBER)
  323                                                 IP6STAT_INC(ip6s_notmember);
  324                                         if (blocked == MCAST_NOTSMEMBER ||
  325                                             blocked == MCAST_MUTED)
  326                                                 UDPSTAT_INC(udps_filtermcast);
  327                                         INP_RUNLOCK(inp); /* XXX */
  328                                         continue;
  329                                 }
  330 
  331                                 INP_RUNLOCK(inp);
  332                         }
  333                         if (last != NULL) {
  334                                 struct mbuf *n;
  335 
  336                                 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
  337                                         INP_RLOCK(last);
  338                                         up = intoudpcb(last);
  339                                         if (up->u_tun_func == NULL) {
  340                                                 udp6_append(last, n, off, &fromsa);
  341                                         } else {
  342                                                 /*
  343                                                  * Engage the tunneling
  344                                                  * protocol we will have to
  345                                                  * leave the info_lock up,
  346                                                  * since we are hunting
  347                                                  * through multiple UDP's.
  348                                                  * 
  349                                                  */
  350                                                 (*up->u_tun_func)(n, off, last);
  351                                         }
  352                                         INP_RUNLOCK(last);
  353                                 }
  354                         }
  355                         last = inp;
  356                         /*
  357                          * Don't look for additional matches if this one does
  358                          * not have either the SO_REUSEPORT or SO_REUSEADDR
  359                          * socket options set.  This heuristic avoids
  360                          * searching through all pcbs in the common case of a
  361                          * non-shared port.  It assumes that an application
  362                          * will never clear these options after setting them.
  363                          */
  364                         if ((last->inp_socket->so_options &
  365                              (SO_REUSEPORT|SO_REUSEADDR)) == 0)
  366                                 break;
  367                 }
  368 
  369                 if (last == NULL) {
  370                         /*
  371                          * No matching pcb found; discard datagram.  (No need
  372                          * to send an ICMP Port Unreachable for a broadcast
  373                          * or multicast datgram.)
  374                          */
  375                         UDPSTAT_INC(udps_noport);
  376                         UDPSTAT_INC(udps_noportmcast);
  377                         goto badheadlocked;
  378                 }
  379                 INP_RLOCK(last);
  380                 INP_INFO_RUNLOCK(&V_udbinfo);
  381                 up = intoudpcb(last);
  382                 if (up->u_tun_func == NULL) {
  383                         udp6_append(last, m, off, &fromsa);
  384                 } else {
  385                         /*
  386                          * Engage the tunneling protocol.
  387                          */
  388                         (*up->u_tun_func)(m, off, last);
  389                 }
  390                 INP_RUNLOCK(last);
  391                 return (IPPROTO_DONE);
  392         }
  393         /*
  394          * Locate pcb for datagram.
  395          */
  396 #ifdef IPFIREWALL_FORWARD
  397         /*
  398          * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain.
  399          */
  400         fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL);
  401         if (fwd_tag != NULL) {
  402                 struct sockaddr_in6 *next_hop6;
  403 
  404                 next_hop6 = (struct sockaddr_in6 *)(fwd_tag + 1);
  405 
  406                 /*
  407                  * Transparently forwarded. Pretend to be the destination.
  408                  * Already got one like this?
  409                  */
  410                 inp = in6_pcblookup_mbuf(&V_udbinfo,
  411                     &ip6->ip6_src, uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
  412                     INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif, m);
  413                 if (!inp) {
  414                         /*
  415                          * It's new.  Try to find the ambushing socket.
  416                          * Because we've rewritten the destination address,
  417                          * any hardware-generated hash is ignored.
  418                          */
  419                         inp = in6_pcblookup(&V_udbinfo, &ip6->ip6_src,
  420                             uh->uh_sport, &next_hop6->sin6_addr,
  421                             next_hop6->sin6_port ? htons(next_hop6->sin6_port) :
  422                             uh->uh_dport, INPLOOKUP_WILDCARD |
  423                             INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif);
  424                 }
  425                 /* Remove the tag from the packet. We don't need it anymore. */
  426                 m_tag_delete(m, fwd_tag);
  427         } else
  428 #endif /* IPFIREWALL_FORWARD */
  429                 inp = in6_pcblookup_mbuf(&V_udbinfo, &ip6->ip6_src,
  430                     uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
  431                     INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB,
  432                     m->m_pkthdr.rcvif, m);
  433         if (inp == NULL) {
  434                 if (udp_log_in_vain) {
  435                         char ip6bufs[INET6_ADDRSTRLEN];
  436                         char ip6bufd[INET6_ADDRSTRLEN];
  437 
  438                         log(LOG_INFO,
  439                             "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
  440                             ip6_sprintf(ip6bufd, &ip6->ip6_dst),
  441                             ntohs(uh->uh_dport),
  442                             ip6_sprintf(ip6bufs, &ip6->ip6_src),
  443                             ntohs(uh->uh_sport));
  444                 }
  445                 UDPSTAT_INC(udps_noport);
  446                 if (m->m_flags & M_MCAST) {
  447                         printf("UDP6: M_MCAST is set in a unicast packet.\n");
  448                         UDPSTAT_INC(udps_noportmcast);
  449                         goto badunlocked;
  450                 }
  451                 if (V_udp_blackhole)
  452                         goto badunlocked;
  453                 if (badport_bandlim(BANDLIM_ICMP6_UNREACH) < 0)
  454                         goto badunlocked;
  455                 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
  456                 return (IPPROTO_DONE);
  457         }
  458         INP_RLOCK_ASSERT(inp);
  459         up = intoudpcb(inp);
  460         if (up->u_tun_func == NULL) {
  461                 udp6_append(inp, m, off, &fromsa);
  462         } else {
  463                 /*
  464                  * Engage the tunneling protocol.
  465                  */
  466 
  467                 (*up->u_tun_func)(m, off, inp);
  468         }
  469         INP_RUNLOCK(inp);
  470         return (IPPROTO_DONE);
  471 
  472 badheadlocked:
  473         INP_INFO_RUNLOCK(&V_udbinfo);
  474 badunlocked:
  475         if (m)
  476                 m_freem(m);
  477         return (IPPROTO_DONE);
  478 }
  479 
  480 void
  481 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d)
  482 {
  483         struct udphdr uh;
  484         struct ip6_hdr *ip6;
  485         struct mbuf *m;
  486         int off = 0;
  487         struct ip6ctlparam *ip6cp = NULL;
  488         const struct sockaddr_in6 *sa6_src = NULL;
  489         void *cmdarg;
  490         struct inpcb *(*notify)(struct inpcb *, int) = udp_notify;
  491         struct udp_portonly {
  492                 u_int16_t uh_sport;
  493                 u_int16_t uh_dport;
  494         } *uhp;
  495 
  496         if (sa->sa_family != AF_INET6 ||
  497             sa->sa_len != sizeof(struct sockaddr_in6))
  498                 return;
  499 
  500         if ((unsigned)cmd >= PRC_NCMDS)
  501                 return;
  502         if (PRC_IS_REDIRECT(cmd))
  503                 notify = in6_rtchange, d = NULL;
  504         else if (cmd == PRC_HOSTDEAD)
  505                 d = NULL;
  506         else if (inet6ctlerrmap[cmd] == 0)
  507                 return;
  508 
  509         /* if the parameter is from icmp6, decode it. */
  510         if (d != NULL) {
  511                 ip6cp = (struct ip6ctlparam *)d;
  512                 m = ip6cp->ip6c_m;
  513                 ip6 = ip6cp->ip6c_ip6;
  514                 off = ip6cp->ip6c_off;
  515                 cmdarg = ip6cp->ip6c_cmdarg;
  516                 sa6_src = ip6cp->ip6c_src;
  517         } else {
  518                 m = NULL;
  519                 ip6 = NULL;
  520                 cmdarg = NULL;
  521                 sa6_src = &sa6_any;
  522         }
  523 
  524         if (ip6) {
  525                 /*
  526                  * XXX: We assume that when IPV6 is non NULL,
  527                  * M and OFF are valid.
  528                  */
  529 
  530                 /* Check if we can safely examine src and dst ports. */
  531                 if (m->m_pkthdr.len < off + sizeof(*uhp))
  532                         return;
  533 
  534                 bzero(&uh, sizeof(uh));
  535                 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
  536 
  537                 (void) in6_pcbnotify(&V_udbinfo, sa, uh.uh_dport,
  538                     (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd,
  539                     cmdarg, notify);
  540         } else
  541                 (void) in6_pcbnotify(&V_udbinfo, sa, 0,
  542                     (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
  543 }
  544 
  545 static int
  546 udp6_getcred(SYSCTL_HANDLER_ARGS)
  547 {
  548         struct xucred xuc;
  549         struct sockaddr_in6 addrs[2];
  550         struct inpcb *inp;
  551         int error;
  552 
  553         error = priv_check(req->td, PRIV_NETINET_GETCRED);
  554         if (error)
  555                 return (error);
  556 
  557         if (req->newlen != sizeof(addrs))
  558                 return (EINVAL);
  559         if (req->oldlen != sizeof(struct xucred))
  560                 return (EINVAL);
  561         error = SYSCTL_IN(req, addrs, sizeof(addrs));
  562         if (error)
  563                 return (error);
  564         if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 ||
  565             (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) {
  566                 return (error);
  567         }
  568         inp = in6_pcblookup(&V_udbinfo, &addrs[1].sin6_addr,
  569             addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port,
  570             INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
  571         if (inp != NULL) {
  572                 INP_RLOCK_ASSERT(inp);
  573                 if (inp->inp_socket == NULL)
  574                         error = ENOENT;
  575                 if (error == 0)
  576                         error = cr_canseesocket(req->td->td_ucred,
  577                             inp->inp_socket);
  578                 if (error == 0)
  579                         cru2x(inp->inp_cred, &xuc);
  580                 INP_RUNLOCK(inp);
  581         } else
  582                 error = ENOENT;
  583         if (error == 0)
  584                 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
  585         return (error);
  586 }
  587 
  588 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0,
  589     0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection");
  590 
  591 static int
  592 udp6_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr6,
  593     struct mbuf *control, struct thread *td)
  594 {
  595         u_int32_t ulen = m->m_pkthdr.len;
  596         u_int32_t plen = sizeof(struct udphdr) + ulen;
  597         struct ip6_hdr *ip6;
  598         struct udphdr *udp6;
  599         struct in6_addr *laddr, *faddr, in6a;
  600         struct sockaddr_in6 *sin6 = NULL;
  601         struct ifnet *oifp = NULL;
  602         int scope_ambiguous = 0;
  603         u_short fport;
  604         int error = 0;
  605         struct ip6_pktopts *optp, opt;
  606         int af = AF_INET6, hlen = sizeof(struct ip6_hdr);
  607         int flags;
  608         struct sockaddr_in6 tmp;
  609 
  610         INP_WLOCK_ASSERT(inp);
  611         INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
  612 
  613         if (addr6) {
  614                 /* addr6 has been validated in udp6_send(). */
  615                 sin6 = (struct sockaddr_in6 *)addr6;
  616 
  617                 /* protect *sin6 from overwrites */
  618                 tmp = *sin6;
  619                 sin6 = &tmp;
  620 
  621                 /*
  622                  * Application should provide a proper zone ID or the use of
  623                  * default zone IDs should be enabled.  Unfortunately, some
  624                  * applications do not behave as it should, so we need a
  625                  * workaround.  Even if an appropriate ID is not determined,
  626                  * we'll see if we can determine the outgoing interface.  If we
  627                  * can, determine the zone ID based on the interface below.
  628                  */
  629                 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone)
  630                         scope_ambiguous = 1;
  631                 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
  632                         return (error);
  633         }
  634 
  635         if (control) {
  636                 if ((error = ip6_setpktopts(control, &opt,
  637                     inp->in6p_outputopts, td->td_ucred, IPPROTO_UDP)) != 0)
  638                         goto release;
  639                 optp = &opt;
  640         } else
  641                 optp = inp->in6p_outputopts;
  642 
  643         if (sin6) {
  644                 faddr = &sin6->sin6_addr;
  645 
  646                 /*
  647                  * IPv4 version of udp_output calls in_pcbconnect in this case,
  648                  * which needs splnet and affects performance.
  649                  * Since we saw no essential reason for calling in_pcbconnect,
  650                  * we get rid of such kind of logic, and call in6_selectsrc
  651                  * and in6_pcbsetport in order to fill in the local address
  652                  * and the local port.
  653                  */
  654                 if (sin6->sin6_port == 0) {
  655                         error = EADDRNOTAVAIL;
  656                         goto release;
  657                 }
  658 
  659                 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
  660                         /* how about ::ffff:0.0.0.0 case? */
  661                         error = EISCONN;
  662                         goto release;
  663                 }
  664 
  665                 fport = sin6->sin6_port; /* allow 0 port */
  666 
  667                 if (IN6_IS_ADDR_V4MAPPED(faddr)) {
  668                         if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) {
  669                                 /*
  670                                  * I believe we should explicitly discard the
  671                                  * packet when mapped addresses are disabled,
  672                                  * rather than send the packet as an IPv6 one.
  673                                  * If we chose the latter approach, the packet
  674                                  * might be sent out on the wire based on the
  675                                  * default route, the situation which we'd
  676                                  * probably want to avoid.
  677                                  * (20010421 jinmei@kame.net)
  678                                  */
  679                                 error = EINVAL;
  680                                 goto release;
  681                         }
  682                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
  683                             !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) {
  684                                 /*
  685                                  * when remote addr is an IPv4-mapped address,
  686                                  * local addr should not be an IPv6 address,
  687                                  * since you cannot determine how to map IPv6
  688                                  * source address to IPv4.
  689                                  */
  690                                 error = EINVAL;
  691                                 goto release;
  692                         }
  693 
  694                         af = AF_INET;
  695                 }
  696 
  697                 if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
  698                         error = in6_selectsrc(sin6, optp, inp, NULL,
  699                             td->td_ucred, &oifp, &in6a);
  700                         if (error)
  701                                 goto release;
  702                         if (oifp && scope_ambiguous &&
  703                             (error = in6_setscope(&sin6->sin6_addr,
  704                             oifp, NULL))) {
  705                                 goto release;
  706                         }
  707                         laddr = &in6a;
  708                 } else
  709                         laddr = &inp->in6p_laddr;       /* XXX */
  710                 if (laddr == NULL) {
  711                         if (error == 0)
  712                                 error = EADDRNOTAVAIL;
  713                         goto release;
  714                 }
  715                 if (inp->inp_lport == 0 &&
  716                     (error = in6_pcbsetport(laddr, inp, td->td_ucred)) != 0) {
  717                         /* Undo an address bind that may have occurred. */
  718                         inp->in6p_laddr = in6addr_any;
  719                         goto release;
  720                 }
  721         } else {
  722                 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
  723                         error = ENOTCONN;
  724                         goto release;
  725                 }
  726                 if (IN6_IS_ADDR_V4MAPPED(&inp->in6p_faddr)) {
  727                         if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) {
  728                                 /*
  729                                  * XXX: this case would happen when the
  730                                  * application sets the V6ONLY flag after
  731                                  * connecting the foreign address.
  732                                  * Such applications should be fixed,
  733                                  * so we bark here.
  734                                  */
  735                                 log(LOG_INFO, "udp6_output: IPV6_V6ONLY "
  736                                     "option was set for a connected socket\n");
  737                                 error = EINVAL;
  738                                 goto release;
  739                         } else
  740                                 af = AF_INET;
  741                 }
  742                 laddr = &inp->in6p_laddr;
  743                 faddr = &inp->in6p_faddr;
  744                 fport = inp->inp_fport;
  745         }
  746 
  747         if (af == AF_INET)
  748                 hlen = sizeof(struct ip);
  749 
  750         /*
  751          * Calculate data length and get a mbuf
  752          * for UDP and IP6 headers.
  753          */
  754         M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT);
  755         if (m == 0) {
  756                 error = ENOBUFS;
  757                 goto release;
  758         }
  759 
  760         /*
  761          * Stuff checksum and output datagram.
  762          */
  763         udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
  764         udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */
  765         udp6->uh_dport = fport;
  766         if (plen <= 0xffff)
  767                 udp6->uh_ulen = htons((u_short)plen);
  768         else
  769                 udp6->uh_ulen = 0;
  770         udp6->uh_sum = 0;
  771 
  772         switch (af) {
  773         case AF_INET6:
  774                 ip6 = mtod(m, struct ip6_hdr *);
  775                 ip6->ip6_flow   = inp->inp_flow & IPV6_FLOWINFO_MASK;
  776                 ip6->ip6_vfc    &= ~IPV6_VERSION_MASK;
  777                 ip6->ip6_vfc    |= IPV6_VERSION;
  778 #if 0                           /* ip6_plen will be filled in ip6_output. */
  779                 ip6->ip6_plen   = htons((u_short)plen);
  780 #endif
  781                 ip6->ip6_nxt    = IPPROTO_UDP;
  782                 ip6->ip6_hlim   = in6_selecthlim(inp, NULL);
  783                 ip6->ip6_src    = *laddr;
  784                 ip6->ip6_dst    = *faddr;
  785 
  786                 udp6->uh_sum = in6_cksum_pseudo(ip6, plen, IPPROTO_UDP, 0);
  787                 m->m_pkthdr.csum_flags = CSUM_UDP_IPV6;
  788                 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
  789 
  790                 flags = 0;
  791 
  792                 UDPSTAT_INC(udps_opackets);
  793                 error = ip6_output(m, optp, NULL, flags, inp->in6p_moptions,
  794                     NULL, inp);
  795                 break;
  796         case AF_INET:
  797                 error = EAFNOSUPPORT;
  798                 goto release;
  799         }
  800         goto releaseopt;
  801 
  802 release:
  803         m_freem(m);
  804 
  805 releaseopt:
  806         if (control) {
  807                 ip6_clearpktopts(&opt, -1);
  808                 m_freem(control);
  809         }
  810         return (error);
  811 }
  812 
  813 static void
  814 udp6_abort(struct socket *so)
  815 {
  816         struct inpcb *inp;
  817 
  818         inp = sotoinpcb(so);
  819         KASSERT(inp != NULL, ("udp6_abort: inp == NULL"));
  820 
  821 #ifdef INET
  822         if (inp->inp_vflag & INP_IPV4) {
  823                 struct pr_usrreqs *pru;
  824 
  825                 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
  826                 (*pru->pru_abort)(so);
  827                 return;
  828         }
  829 #endif
  830 
  831         INP_WLOCK(inp);
  832         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
  833                 INP_HASH_WLOCK(&V_udbinfo);
  834                 in6_pcbdisconnect(inp);
  835                 inp->in6p_laddr = in6addr_any;
  836                 INP_HASH_WUNLOCK(&V_udbinfo);
  837                 soisdisconnected(so);
  838         }
  839         INP_WUNLOCK(inp);
  840 }
  841 
  842 static int
  843 udp6_attach(struct socket *so, int proto, struct thread *td)
  844 {
  845         struct inpcb *inp;
  846         int error;
  847 
  848         inp = sotoinpcb(so);
  849         KASSERT(inp == NULL, ("udp6_attach: inp != NULL"));
  850 
  851         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
  852                 error = soreserve(so, udp_sendspace, udp_recvspace);
  853                 if (error)
  854                         return (error);
  855         }
  856         INP_INFO_WLOCK(&V_udbinfo);
  857         error = in_pcballoc(so, &V_udbinfo);
  858         if (error) {
  859                 INP_INFO_WUNLOCK(&V_udbinfo);
  860                 return (error);
  861         }
  862         inp = (struct inpcb *)so->so_pcb;
  863         inp->inp_vflag |= INP_IPV6;
  864         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
  865                 inp->inp_vflag |= INP_IPV4;
  866         inp->in6p_hops = -1;    /* use kernel default */
  867         inp->in6p_cksum = -1;   /* just to be sure */
  868         /*
  869          * XXX: ugly!!
  870          * IPv4 TTL initialization is necessary for an IPv6 socket as well,
  871          * because the socket may be bound to an IPv6 wildcard address,
  872          * which may match an IPv4-mapped IPv6 address.
  873          */
  874         inp->inp_ip_ttl = V_ip_defttl;
  875 
  876         error = udp_newudpcb(inp);
  877         if (error) {
  878                 in_pcbdetach(inp);
  879                 in_pcbfree(inp);
  880                 INP_INFO_WUNLOCK(&V_udbinfo);
  881                 return (error);
  882         }
  883         INP_WUNLOCK(inp);
  884         INP_INFO_WUNLOCK(&V_udbinfo);
  885         return (0);
  886 }
  887 
  888 static int
  889 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
  890 {
  891         struct inpcb *inp;
  892         int error;
  893 
  894         inp = sotoinpcb(so);
  895         KASSERT(inp != NULL, ("udp6_bind: inp == NULL"));
  896 
  897         INP_WLOCK(inp);
  898         INP_HASH_WLOCK(&V_udbinfo);
  899         inp->inp_vflag &= ~INP_IPV4;
  900         inp->inp_vflag |= INP_IPV6;
  901         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
  902                 struct sockaddr_in6 *sin6_p;
  903 
  904                 sin6_p = (struct sockaddr_in6 *)nam;
  905 
  906                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
  907                         inp->inp_vflag |= INP_IPV4;
  908 #ifdef INET
  909                 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
  910                         struct sockaddr_in sin;
  911 
  912                         in6_sin6_2_sin(&sin, sin6_p);
  913                         inp->inp_vflag |= INP_IPV4;
  914                         inp->inp_vflag &= ~INP_IPV6;
  915                         error = in_pcbbind(inp, (struct sockaddr *)&sin,
  916                             td->td_ucred);
  917                         goto out;
  918                 }
  919 #endif
  920         }
  921 
  922         error = in6_pcbbind(inp, nam, td->td_ucred);
  923 #ifdef INET
  924 out:
  925 #endif
  926         INP_HASH_WUNLOCK(&V_udbinfo);
  927         INP_WUNLOCK(inp);
  928         return (error);
  929 }
  930 
  931 static void
  932 udp6_close(struct socket *so)
  933 {
  934         struct inpcb *inp;
  935 
  936         inp = sotoinpcb(so);
  937         KASSERT(inp != NULL, ("udp6_close: inp == NULL"));
  938 
  939 #ifdef INET
  940         if (inp->inp_vflag & INP_IPV4) {
  941                 struct pr_usrreqs *pru;
  942 
  943                 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
  944                 (*pru->pru_disconnect)(so);
  945                 return;
  946         }
  947 #endif
  948         INP_WLOCK(inp);
  949         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
  950                 INP_HASH_WLOCK(&V_udbinfo);
  951                 in6_pcbdisconnect(inp);
  952                 inp->in6p_laddr = in6addr_any;
  953                 INP_HASH_WUNLOCK(&V_udbinfo);
  954                 soisdisconnected(so);
  955         }
  956         INP_WUNLOCK(inp);
  957 }
  958 
  959 static int
  960 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
  961 {
  962         struct inpcb *inp;
  963         struct sockaddr_in6 *sin6;
  964         int error;
  965 
  966         inp = sotoinpcb(so);
  967         sin6 = (struct sockaddr_in6 *)nam;
  968         KASSERT(inp != NULL, ("udp6_connect: inp == NULL"));
  969 
  970         /*
  971          * XXXRW: Need to clarify locking of v4/v6 flags.
  972          */
  973         INP_WLOCK(inp);
  974 #ifdef INET
  975         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
  976                 struct sockaddr_in sin;
  977 
  978                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
  979                         error = EINVAL;
  980                         goto out;
  981                 }
  982                 if (inp->inp_faddr.s_addr != INADDR_ANY) {
  983                         error = EISCONN;
  984                         goto out;
  985                 }
  986                 in6_sin6_2_sin(&sin, sin6);
  987                 inp->inp_vflag |= INP_IPV4;
  988                 inp->inp_vflag &= ~INP_IPV6;
  989                 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr);
  990                 if (error != 0)
  991                         goto out;
  992                 INP_HASH_WLOCK(&V_udbinfo);
  993                 error = in_pcbconnect(inp, (struct sockaddr *)&sin,
  994                     td->td_ucred);
  995                 INP_HASH_WUNLOCK(&V_udbinfo);
  996                 if (error == 0)
  997                         soisconnected(so);
  998                 goto out;
  999         }
 1000 #endif
 1001         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 1002                 error = EISCONN;
 1003                 goto out;
 1004         }
 1005         inp->inp_vflag &= ~INP_IPV4;
 1006         inp->inp_vflag |= INP_IPV6;
 1007         error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr);
 1008         if (error != 0)
 1009                 goto out;
 1010         INP_HASH_WLOCK(&V_udbinfo);
 1011         error = in6_pcbconnect(inp, nam, td->td_ucred);
 1012         INP_HASH_WUNLOCK(&V_udbinfo);
 1013         if (error == 0)
 1014                 soisconnected(so);
 1015 out:
 1016         INP_WUNLOCK(inp);
 1017         return (error);
 1018 }
 1019 
 1020 static void
 1021 udp6_detach(struct socket *so)
 1022 {
 1023         struct inpcb *inp;
 1024         struct udpcb *up;
 1025 
 1026         inp = sotoinpcb(so);
 1027         KASSERT(inp != NULL, ("udp6_detach: inp == NULL"));
 1028 
 1029         INP_INFO_WLOCK(&V_udbinfo);
 1030         INP_WLOCK(inp);
 1031         up = intoudpcb(inp);
 1032         KASSERT(up != NULL, ("%s: up == NULL", __func__));
 1033         in_pcbdetach(inp);
 1034         in_pcbfree(inp);
 1035         INP_INFO_WUNLOCK(&V_udbinfo);
 1036         udp_discardcb(up);
 1037 }
 1038 
 1039 static int
 1040 udp6_disconnect(struct socket *so)
 1041 {
 1042         struct inpcb *inp;
 1043         int error;
 1044 
 1045         inp = sotoinpcb(so);
 1046         KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL"));
 1047 
 1048 #ifdef INET
 1049         if (inp->inp_vflag & INP_IPV4) {
 1050                 struct pr_usrreqs *pru;
 1051 
 1052                 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
 1053                 (void)(*pru->pru_disconnect)(so);
 1054                 return (0);
 1055         }
 1056 #endif
 1057 
 1058         INP_WLOCK(inp);
 1059 
 1060         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 1061                 error = ENOTCONN;
 1062                 goto out;
 1063         }
 1064 
 1065         INP_HASH_WLOCK(&V_udbinfo);
 1066         in6_pcbdisconnect(inp);
 1067         inp->in6p_laddr = in6addr_any;
 1068         INP_HASH_WUNLOCK(&V_udbinfo);
 1069         SOCK_LOCK(so);
 1070         so->so_state &= ~SS_ISCONNECTED;                /* XXX */
 1071         SOCK_UNLOCK(so);
 1072 out:
 1073         INP_WUNLOCK(inp);
 1074         return (0);
 1075 }
 1076 
 1077 static int
 1078 udp6_send(struct socket *so, int flags, struct mbuf *m,
 1079     struct sockaddr *addr, struct mbuf *control, struct thread *td)
 1080 {
 1081         struct inpcb *inp;
 1082         int error = 0;
 1083 
 1084         inp = sotoinpcb(so);
 1085         KASSERT(inp != NULL, ("udp6_send: inp == NULL"));
 1086 
 1087         INP_WLOCK(inp);
 1088         if (addr) {
 1089                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 1090                         error = EINVAL;
 1091                         goto bad;
 1092                 }
 1093                 if (addr->sa_family != AF_INET6) {
 1094                         error = EAFNOSUPPORT;
 1095                         goto bad;
 1096                 }
 1097         }
 1098 
 1099 #ifdef INET
 1100         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
 1101                 int hasv4addr;
 1102                 struct sockaddr_in6 *sin6 = 0;
 1103 
 1104                 if (addr == 0)
 1105                         hasv4addr = (inp->inp_vflag & INP_IPV4);
 1106                 else {
 1107                         sin6 = (struct sockaddr_in6 *)addr;
 1108                         hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
 1109                             ? 1 : 0;
 1110                 }
 1111                 if (hasv4addr) {
 1112                         struct pr_usrreqs *pru;
 1113 
 1114                         /*
 1115                          * XXXRW: We release UDP-layer locks before calling
 1116                          * udp_send() in order to avoid recursion.  However,
 1117                          * this does mean there is a short window where inp's
 1118                          * fields are unstable.  Could this lead to a
 1119                          * potential race in which the factors causing us to
 1120                          * select the UDPv4 output routine are invalidated?
 1121                          */
 1122                         INP_WUNLOCK(inp);
 1123                         if (sin6)
 1124                                 in6_sin6_2_sin_in_sock(addr);
 1125                         pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
 1126                         /* addr will just be freed in sendit(). */
 1127                         return ((*pru->pru_send)(so, flags, m, addr, control,
 1128                             td));
 1129                 }
 1130         }
 1131 #endif
 1132 #ifdef MAC
 1133         mac_inpcb_create_mbuf(inp, m);
 1134 #endif
 1135         INP_HASH_WLOCK(&V_udbinfo);
 1136         error = udp6_output(inp, m, addr, control, td);
 1137         INP_HASH_WUNLOCK(&V_udbinfo);
 1138 #ifdef INET
 1139 #endif  
 1140         INP_WUNLOCK(inp);
 1141         return (error);
 1142 
 1143 bad:
 1144         INP_WUNLOCK(inp);
 1145         m_freem(m);
 1146         return (error);
 1147 }
 1148 
 1149 struct pr_usrreqs udp6_usrreqs = {
 1150         .pru_abort =            udp6_abort,
 1151         .pru_attach =           udp6_attach,
 1152         .pru_bind =             udp6_bind,
 1153         .pru_connect =          udp6_connect,
 1154         .pru_control =          in6_control,
 1155         .pru_detach =           udp6_detach,
 1156         .pru_disconnect =       udp6_disconnect,
 1157         .pru_peeraddr =         in6_mapped_peeraddr,
 1158         .pru_send =             udp6_send,
 1159         .pru_shutdown =         udp_shutdown,
 1160         .pru_sockaddr =         in6_mapped_sockaddr,
 1161         .pru_soreceive =        soreceive_dgram,
 1162         .pru_sosend =           sosend_dgram,
 1163         .pru_sosetlabel =       in_pcbsosetlabel,
 1164         .pru_close =            udp6_close
 1165 };

Cache object: 23e8d74f0777cdcfe81118ded44a2921


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.