The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netinet6/udp6_usrreq.c

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    1 /*-
    2  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    3  * Copyright (c) 2010-2011 Juniper Networks, Inc.
    4  * Copyright (c) 2014 Kevin Lo
    5  * All rights reserved.
    6  *
    7  * Portions of this software were developed by Robert N. M. Watson under
    8  * contract to Juniper Networks, Inc.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. Neither the name of the project nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      $KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 jinmei Exp $
   35  *      $KAME: udp6_output.c,v 1.31 2001/05/21 16:39:15 jinmei Exp $
   36  */
   37 
   38 /*-
   39  * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
   40  *      The Regents of the University of California.
   41  * All rights reserved.
   42  *
   43  * Redistribution and use in source and binary forms, with or without
   44  * modification, are permitted provided that the following conditions
   45  * are met:
   46  * 1. Redistributions of source code must retain the above copyright
   47  *    notice, this list of conditions and the following disclaimer.
   48  * 2. Redistributions in binary form must reproduce the above copyright
   49  *    notice, this list of conditions and the following disclaimer in the
   50  *    documentation and/or other materials provided with the distribution.
   51  * 4. Neither the name of the University nor the names of its contributors
   52  *    may be used to endorse or promote products derived from this software
   53  *    without specific prior written permission.
   54  *
   55  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   56  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   57  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   58  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   59  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   60  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   61  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   62  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   63  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   64  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   65  * SUCH DAMAGE.
   66  *
   67  *      @(#)udp_usrreq.c        8.6 (Berkeley) 5/23/95
   68  */
   69 
   70 #include <sys/cdefs.h>
   71 __FBSDID("$FreeBSD: releng/10.1/sys/netinet6/udp6_usrreq.c 272991 2014-10-12 17:07:15Z tuexen $");
   72 
   73 #include "opt_inet.h"
   74 #include "opt_inet6.h"
   75 #include "opt_ipfw.h"
   76 #include "opt_ipsec.h"
   77 #include "opt_kdtrace.h"
   78 
   79 #include <sys/param.h>
   80 #include <sys/jail.h>
   81 #include <sys/kernel.h>
   82 #include <sys/lock.h>
   83 #include <sys/mbuf.h>
   84 #include <sys/priv.h>
   85 #include <sys/proc.h>
   86 #include <sys/protosw.h>
   87 #include <sys/sdt.h>
   88 #include <sys/signalvar.h>
   89 #include <sys/socket.h>
   90 #include <sys/socketvar.h>
   91 #include <sys/sx.h>
   92 #include <sys/sysctl.h>
   93 #include <sys/syslog.h>
   94 #include <sys/systm.h>
   95 
   96 #include <net/if.h>
   97 #include <net/if_types.h>
   98 #include <net/route.h>
   99 
  100 #include <netinet/in.h>
  101 #include <netinet/in_kdtrace.h>
  102 #include <netinet/in_pcb.h>
  103 #include <netinet/in_systm.h>
  104 #include <netinet/in_var.h>
  105 #include <netinet/ip.h>
  106 #include <netinet/ip_icmp.h>
  107 #include <netinet/ip6.h>
  108 #include <netinet/icmp_var.h>
  109 #include <netinet/icmp6.h>
  110 #include <netinet/ip_var.h>
  111 #include <netinet/udp.h>
  112 #include <netinet/udp_var.h>
  113 #include <netinet/udplite.h>
  114 
  115 #include <netinet6/ip6protosw.h>
  116 #include <netinet6/ip6_var.h>
  117 #include <netinet6/in6_pcb.h>
  118 #include <netinet6/udp6_var.h>
  119 #include <netinet6/scope6_var.h>
  120 
  121 #ifdef IPSEC
  122 #include <netipsec/ipsec.h>
  123 #include <netipsec/ipsec6.h>
  124 #endif /* IPSEC */
  125 
  126 #include <security/mac/mac_framework.h>
  127 
  128 /*
  129  * UDP protocol implementation.
  130  * Per RFC 768, August, 1980.
  131  */
  132 
  133 extern struct protosw   inetsw[];
  134 static void             udp6_detach(struct socket *so);
  135 
  136 static void
  137 udp6_append(struct inpcb *inp, struct mbuf *n, int off,
  138     struct sockaddr_in6 *fromsa)
  139 {
  140         struct socket *so;
  141         struct mbuf *opts;
  142 
  143         INP_LOCK_ASSERT(inp);
  144 
  145 #ifdef IPSEC
  146         /* Check AH/ESP integrity. */
  147         if (ipsec6_in_reject(n, inp)) {
  148                 m_freem(n);
  149                 IPSEC6STAT_INC(ips_in_polvio);
  150                 return;
  151         }
  152 #endif /* IPSEC */
  153 #ifdef MAC
  154         if (mac_inpcb_check_deliver(inp, n) != 0) {
  155                 m_freem(n);
  156                 return;
  157         }
  158 #endif
  159         opts = NULL;
  160         if (inp->inp_flags & INP_CONTROLOPTS ||
  161             inp->inp_socket->so_options & SO_TIMESTAMP)
  162                 ip6_savecontrol(inp, n, &opts);
  163         m_adj(n, off + sizeof(struct udphdr));
  164 
  165         so = inp->inp_socket;
  166         SOCKBUF_LOCK(&so->so_rcv);
  167         if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)fromsa, n,
  168             opts) == 0) {
  169                 SOCKBUF_UNLOCK(&so->so_rcv);
  170                 m_freem(n);
  171                 if (opts)
  172                         m_freem(opts);
  173                 UDPSTAT_INC(udps_fullsock);
  174         } else
  175                 sorwakeup_locked(so);
  176 }
  177 
  178 int
  179 udp6_input(struct mbuf **mp, int *offp, int proto)
  180 {
  181         struct mbuf *m = *mp;
  182         struct ifnet *ifp;
  183         struct ip6_hdr *ip6;
  184         struct udphdr *uh;
  185         struct inpcb *inp;
  186         struct inpcbinfo *pcbinfo;
  187         struct udpcb *up;
  188         int off = *offp;
  189         int cscov_partial;
  190         int plen, ulen;
  191         struct sockaddr_in6 fromsa;
  192         struct m_tag *fwd_tag;
  193         uint16_t uh_sum;
  194         uint8_t nxt;
  195 
  196         ifp = m->m_pkthdr.rcvif;
  197         ip6 = mtod(m, struct ip6_hdr *);
  198 
  199         if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
  200                 /* XXX send icmp6 host/port unreach? */
  201                 m_freem(m);
  202                 return (IPPROTO_DONE);
  203         }
  204 
  205 #ifndef PULLDOWN_TEST
  206         IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
  207         ip6 = mtod(m, struct ip6_hdr *);
  208         uh = (struct udphdr *)((caddr_t)ip6 + off);
  209 #else
  210         IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh));
  211         if (!uh)
  212                 return (IPPROTO_DONE);
  213 #endif
  214 
  215         UDPSTAT_INC(udps_ipackets);
  216 
  217         /*
  218          * Destination port of 0 is illegal, based on RFC768.
  219          */
  220         if (uh->uh_dport == 0)
  221                 goto badunlocked;
  222 
  223         plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
  224         ulen = ntohs((u_short)uh->uh_ulen);
  225 
  226         nxt = ip6->ip6_nxt;
  227         cscov_partial = (nxt == IPPROTO_UDPLITE) ? 1 : 0;
  228         if (nxt == IPPROTO_UDPLITE) {
  229                 /* Zero means checksum over the complete packet. */
  230                 if (ulen == 0)
  231                         ulen = plen;
  232                 if (ulen == plen)
  233                         cscov_partial = 0;
  234                 if ((ulen < sizeof(struct udphdr)) || (ulen > plen)) {
  235                         /* XXX: What is the right UDPLite MIB counter? */
  236                         goto badunlocked;
  237                 }
  238                 if (uh->uh_sum == 0) {
  239                         /* XXX: What is the right UDPLite MIB counter? */
  240                         goto badunlocked;
  241                 }
  242         } else {
  243                 if ((ulen < sizeof(struct udphdr)) || (plen != ulen)) {
  244                         UDPSTAT_INC(udps_badlen);
  245                         goto badunlocked;
  246                 }
  247                 if (uh->uh_sum == 0) {
  248                         UDPSTAT_INC(udps_nosum);
  249                         goto badunlocked;
  250                 }
  251         }
  252 
  253         if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID_IPV6) &&
  254             !cscov_partial) {
  255                 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
  256                         uh_sum = m->m_pkthdr.csum_data;
  257                 else
  258                         uh_sum = in6_cksum_pseudo(ip6, ulen, nxt,
  259                             m->m_pkthdr.csum_data);
  260                 uh_sum ^= 0xffff;
  261         } else
  262                 uh_sum = in6_cksum_partial(m, nxt, off, plen, ulen);
  263 
  264         if (uh_sum != 0) {
  265                 UDPSTAT_INC(udps_badsum);
  266                 goto badunlocked;
  267         }
  268 
  269         /*
  270          * Construct sockaddr format source address.
  271          */
  272         init_sin6(&fromsa, m);
  273         fromsa.sin6_port = uh->uh_sport;
  274 
  275         pcbinfo = get_inpcbinfo(nxt);
  276         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
  277                 struct inpcb *last;
  278                 struct inpcbhead *pcblist;
  279                 struct ip6_moptions *imo;
  280 
  281                 INP_INFO_RLOCK(pcbinfo);
  282                 /*
  283                  * In the event that laddr should be set to the link-local
  284                  * address (this happens in RIPng), the multicast address
  285                  * specified in the received packet will not match laddr.  To
  286                  * handle this situation, matching is relaxed if the
  287                  * receiving interface is the same as one specified in the
  288                  * socket and if the destination multicast address matches
  289                  * one of the multicast groups specified in the socket.
  290                  */
  291 
  292                 /*
  293                  * KAME note: traditionally we dropped udpiphdr from mbuf
  294                  * here.  We need udphdr for IPsec processing so we do that
  295                  * later.
  296                  */
  297                 pcblist = get_pcblist(nxt);
  298                 last = NULL;
  299                 LIST_FOREACH(inp, pcblist, inp_list) {
  300                         if ((inp->inp_vflag & INP_IPV6) == 0)
  301                                 continue;
  302                         if (inp->inp_lport != uh->uh_dport)
  303                                 continue;
  304                         if (inp->inp_fport != 0 &&
  305                             inp->inp_fport != uh->uh_sport)
  306                                 continue;
  307                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
  308                                 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
  309                                                         &ip6->ip6_dst))
  310                                         continue;
  311                         }
  312                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
  313                                 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
  314                                                         &ip6->ip6_src) ||
  315                                     inp->inp_fport != uh->uh_sport)
  316                                         continue;
  317                         }
  318 
  319                         /*
  320                          * XXXRW: Because we weren't holding either the inpcb
  321                          * or the hash lock when we checked for a match 
  322                          * before, we should probably recheck now that the 
  323                          * inpcb lock is (supposed to be) held.
  324                          */
  325 
  326                         /*
  327                          * Handle socket delivery policy for any-source
  328                          * and source-specific multicast. [RFC3678]
  329                          */
  330                         imo = inp->in6p_moptions;
  331                         if (imo && IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
  332                                 struct sockaddr_in6      mcaddr;
  333                                 int                      blocked;
  334 
  335                                 INP_RLOCK(inp);
  336 
  337                                 bzero(&mcaddr, sizeof(struct sockaddr_in6));
  338                                 mcaddr.sin6_len = sizeof(struct sockaddr_in6);
  339                                 mcaddr.sin6_family = AF_INET6;
  340                                 mcaddr.sin6_addr = ip6->ip6_dst;
  341 
  342                                 blocked = im6o_mc_filter(imo, ifp,
  343                                         (struct sockaddr *)&mcaddr,
  344                                         (struct sockaddr *)&fromsa);
  345                                 if (blocked != MCAST_PASS) {
  346                                         if (blocked == MCAST_NOTGMEMBER)
  347                                                 IP6STAT_INC(ip6s_notmember);
  348                                         if (blocked == MCAST_NOTSMEMBER ||
  349                                             blocked == MCAST_MUTED)
  350                                                 UDPSTAT_INC(udps_filtermcast);
  351                                         INP_RUNLOCK(inp); /* XXX */
  352                                         continue;
  353                                 }
  354 
  355                                 INP_RUNLOCK(inp);
  356                         }
  357                         if (last != NULL) {
  358                                 struct mbuf *n;
  359 
  360                                 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
  361                                         INP_RLOCK(last);
  362                                         up = intoudpcb(last);
  363                                         if (up->u_tun_func == NULL) {
  364                                                 udp6_append(last, n, off, &fromsa);
  365                                         } else {
  366                                                 /*
  367                                                  * Engage the tunneling
  368                                                  * protocol we will have to
  369                                                  * leave the info_lock up,
  370                                                  * since we are hunting
  371                                                  * through multiple UDP's.
  372                                                  * 
  373                                                  */
  374                                                 (*up->u_tun_func)(n, off, last);
  375                                         }
  376                                         INP_RUNLOCK(last);
  377                                 }
  378                         }
  379                         last = inp;
  380                         /*
  381                          * Don't look for additional matches if this one does
  382                          * not have either the SO_REUSEPORT or SO_REUSEADDR
  383                          * socket options set.  This heuristic avoids
  384                          * searching through all pcbs in the common case of a
  385                          * non-shared port.  It assumes that an application
  386                          * will never clear these options after setting them.
  387                          */
  388                         if ((last->inp_socket->so_options &
  389                              (SO_REUSEPORT|SO_REUSEADDR)) == 0)
  390                                 break;
  391                 }
  392 
  393                 if (last == NULL) {
  394                         /*
  395                          * No matching pcb found; discard datagram.  (No need
  396                          * to send an ICMP Port Unreachable for a broadcast
  397                          * or multicast datgram.)
  398                          */
  399                         UDPSTAT_INC(udps_noport);
  400                         UDPSTAT_INC(udps_noportmcast);
  401                         goto badheadlocked;
  402                 }
  403                 INP_RLOCK(last);
  404                 INP_INFO_RUNLOCK(pcbinfo);
  405                 up = intoudpcb(last);
  406                 UDP_PROBE(receive, NULL, last, ip6, last, uh);
  407                 if (up->u_tun_func == NULL) {
  408                         udp6_append(last, m, off, &fromsa);
  409                 } else {
  410                         /*
  411                          * Engage the tunneling protocol.
  412                          */
  413                         (*up->u_tun_func)(m, off, last);
  414                 }
  415                 INP_RUNLOCK(last);
  416                 return (IPPROTO_DONE);
  417         }
  418         /*
  419          * Locate pcb for datagram.
  420          */
  421 
  422         /*
  423          * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain.
  424          */
  425         if ((m->m_flags & M_IP6_NEXTHOP) &&
  426             (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
  427                 struct sockaddr_in6 *next_hop6;
  428 
  429                 next_hop6 = (struct sockaddr_in6 *)(fwd_tag + 1);
  430 
  431                 /*
  432                  * Transparently forwarded. Pretend to be the destination.
  433                  * Already got one like this?
  434                  */
  435                 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src,
  436                     uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
  437                     INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif, m);
  438                 if (!inp) {
  439                         /*
  440                          * It's new.  Try to find the ambushing socket.
  441                          * Because we've rewritten the destination address,
  442                          * any hardware-generated hash is ignored.
  443                          */
  444                         inp = in6_pcblookup(pcbinfo, &ip6->ip6_src,
  445                             uh->uh_sport, &next_hop6->sin6_addr,
  446                             next_hop6->sin6_port ? htons(next_hop6->sin6_port) :
  447                             uh->uh_dport, INPLOOKUP_WILDCARD |
  448                             INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif);
  449                 }
  450                 /* Remove the tag from the packet. We don't need it anymore. */
  451                 m_tag_delete(m, fwd_tag);
  452                 m->m_flags &= ~M_IP6_NEXTHOP;
  453         } else
  454                 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src,
  455                     uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
  456                     INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB,
  457                     m->m_pkthdr.rcvif, m);
  458         if (inp == NULL) {
  459                 if (udp_log_in_vain) {
  460                         char ip6bufs[INET6_ADDRSTRLEN];
  461                         char ip6bufd[INET6_ADDRSTRLEN];
  462 
  463                         log(LOG_INFO,
  464                             "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
  465                             ip6_sprintf(ip6bufd, &ip6->ip6_dst),
  466                             ntohs(uh->uh_dport),
  467                             ip6_sprintf(ip6bufs, &ip6->ip6_src),
  468                             ntohs(uh->uh_sport));
  469                 }
  470                 UDPSTAT_INC(udps_noport);
  471                 if (m->m_flags & M_MCAST) {
  472                         printf("UDP6: M_MCAST is set in a unicast packet.\n");
  473                         UDPSTAT_INC(udps_noportmcast);
  474                         goto badunlocked;
  475                 }
  476                 if (V_udp_blackhole)
  477                         goto badunlocked;
  478                 if (badport_bandlim(BANDLIM_ICMP6_UNREACH) < 0)
  479                         goto badunlocked;
  480                 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
  481                 return (IPPROTO_DONE);
  482         }
  483         INP_RLOCK_ASSERT(inp);
  484         up = intoudpcb(inp);
  485         if (cscov_partial) {
  486                 if (up->u_rxcslen == 0 || up->u_rxcslen > ulen) {
  487                         INP_RUNLOCK(inp);
  488                         m_freem(m);
  489                         return (IPPROTO_DONE);
  490                 }
  491         }
  492         UDP_PROBE(receive, NULL, inp, ip6, inp, uh);
  493         if (up->u_tun_func == NULL) {
  494                 udp6_append(inp, m, off, &fromsa);
  495         } else {
  496                 /*
  497                  * Engage the tunneling protocol.
  498                  */
  499 
  500                 (*up->u_tun_func)(m, off, inp);
  501         }
  502         INP_RUNLOCK(inp);
  503         return (IPPROTO_DONE);
  504 
  505 badheadlocked:
  506         INP_INFO_RUNLOCK(pcbinfo);
  507 badunlocked:
  508         if (m)
  509                 m_freem(m);
  510         return (IPPROTO_DONE);
  511 }
  512 
  513 static void
  514 udp6_common_ctlinput(int cmd, struct sockaddr *sa, void *d,
  515     struct inpcbinfo *pcbinfo)
  516 {
  517         struct udphdr uh;
  518         struct ip6_hdr *ip6;
  519         struct mbuf *m;
  520         int off = 0;
  521         struct ip6ctlparam *ip6cp = NULL;
  522         const struct sockaddr_in6 *sa6_src = NULL;
  523         void *cmdarg;
  524         struct inpcb *(*notify)(struct inpcb *, int) = udp_notify;
  525         struct udp_portonly {
  526                 u_int16_t uh_sport;
  527                 u_int16_t uh_dport;
  528         } *uhp;
  529 
  530         if (sa->sa_family != AF_INET6 ||
  531             sa->sa_len != sizeof(struct sockaddr_in6))
  532                 return;
  533 
  534         if ((unsigned)cmd >= PRC_NCMDS)
  535                 return;
  536         if (PRC_IS_REDIRECT(cmd))
  537                 notify = in6_rtchange, d = NULL;
  538         else if (cmd == PRC_HOSTDEAD)
  539                 d = NULL;
  540         else if (inet6ctlerrmap[cmd] == 0)
  541                 return;
  542 
  543         /* if the parameter is from icmp6, decode it. */
  544         if (d != NULL) {
  545                 ip6cp = (struct ip6ctlparam *)d;
  546                 m = ip6cp->ip6c_m;
  547                 ip6 = ip6cp->ip6c_ip6;
  548                 off = ip6cp->ip6c_off;
  549                 cmdarg = ip6cp->ip6c_cmdarg;
  550                 sa6_src = ip6cp->ip6c_src;
  551         } else {
  552                 m = NULL;
  553                 ip6 = NULL;
  554                 cmdarg = NULL;
  555                 sa6_src = &sa6_any;
  556         }
  557 
  558         if (ip6) {
  559                 /*
  560                  * XXX: We assume that when IPV6 is non NULL,
  561                  * M and OFF are valid.
  562                  */
  563 
  564                 /* Check if we can safely examine src and dst ports. */
  565                 if (m->m_pkthdr.len < off + sizeof(*uhp))
  566                         return;
  567 
  568                 bzero(&uh, sizeof(uh));
  569                 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
  570 
  571                 (void)in6_pcbnotify(pcbinfo, sa, uh.uh_dport,
  572                     (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd,
  573                     cmdarg, notify);
  574         } else
  575                 (void)in6_pcbnotify(pcbinfo, sa, 0,
  576                     (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
  577 }
  578 
  579 void
  580 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d)
  581 {
  582 
  583         return (udp6_common_ctlinput(cmd, sa, d, &V_udbinfo));
  584 }
  585 
  586 void
  587 udplite6_ctlinput(int cmd, struct sockaddr *sa, void *d)
  588 {
  589 
  590         return (udp6_common_ctlinput(cmd, sa, d, &V_ulitecbinfo));
  591 }
  592 
  593 static int
  594 udp6_getcred(SYSCTL_HANDLER_ARGS)
  595 {
  596         struct xucred xuc;
  597         struct sockaddr_in6 addrs[2];
  598         struct inpcb *inp;
  599         int error;
  600 
  601         error = priv_check(req->td, PRIV_NETINET_GETCRED);
  602         if (error)
  603                 return (error);
  604 
  605         if (req->newlen != sizeof(addrs))
  606                 return (EINVAL);
  607         if (req->oldlen != sizeof(struct xucred))
  608                 return (EINVAL);
  609         error = SYSCTL_IN(req, addrs, sizeof(addrs));
  610         if (error)
  611                 return (error);
  612         if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 ||
  613             (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) {
  614                 return (error);
  615         }
  616         inp = in6_pcblookup(&V_udbinfo, &addrs[1].sin6_addr,
  617             addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port,
  618             INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
  619         if (inp != NULL) {
  620                 INP_RLOCK_ASSERT(inp);
  621                 if (inp->inp_socket == NULL)
  622                         error = ENOENT;
  623                 if (error == 0)
  624                         error = cr_canseesocket(req->td->td_ucred,
  625                             inp->inp_socket);
  626                 if (error == 0)
  627                         cru2x(inp->inp_cred, &xuc);
  628                 INP_RUNLOCK(inp);
  629         } else
  630                 error = ENOENT;
  631         if (error == 0)
  632                 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
  633         return (error);
  634 }
  635 
  636 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0,
  637     0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection");
  638 
  639 static int
  640 udp6_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr6,
  641     struct mbuf *control, struct thread *td)
  642 {
  643         u_int32_t ulen = m->m_pkthdr.len;
  644         u_int32_t plen = sizeof(struct udphdr) + ulen;
  645         struct ip6_hdr *ip6;
  646         struct udphdr *udp6;
  647         struct in6_addr *laddr, *faddr, in6a;
  648         struct sockaddr_in6 *sin6 = NULL;
  649         struct ifnet *oifp = NULL;
  650         int cscov_partial = 0;
  651         int scope_ambiguous = 0;
  652         u_short fport;
  653         int error = 0;
  654         uint8_t nxt;
  655         uint16_t cscov = 0;
  656         struct ip6_pktopts *optp, opt;
  657         int af = AF_INET6, hlen = sizeof(struct ip6_hdr);
  658         int flags;
  659         struct sockaddr_in6 tmp;
  660 
  661         INP_WLOCK_ASSERT(inp);
  662         INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
  663 
  664         if (addr6) {
  665                 /* addr6 has been validated in udp6_send(). */
  666                 sin6 = (struct sockaddr_in6 *)addr6;
  667 
  668                 /* protect *sin6 from overwrites */
  669                 tmp = *sin6;
  670                 sin6 = &tmp;
  671 
  672                 /*
  673                  * Application should provide a proper zone ID or the use of
  674                  * default zone IDs should be enabled.  Unfortunately, some
  675                  * applications do not behave as it should, so we need a
  676                  * workaround.  Even if an appropriate ID is not determined,
  677                  * we'll see if we can determine the outgoing interface.  If we
  678                  * can, determine the zone ID based on the interface below.
  679                  */
  680                 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone)
  681                         scope_ambiguous = 1;
  682                 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
  683                         return (error);
  684         }
  685 
  686         if (control) {
  687                 if ((error = ip6_setpktopts(control, &opt,
  688                     inp->in6p_outputopts, td->td_ucred, IPPROTO_UDP)) != 0)
  689                         goto release;
  690                 optp = &opt;
  691         } else
  692                 optp = inp->in6p_outputopts;
  693 
  694         if (sin6) {
  695                 faddr = &sin6->sin6_addr;
  696 
  697                 /*
  698                  * Since we saw no essential reason for calling in_pcbconnect,
  699                  * we get rid of such kind of logic, and call in6_selectsrc
  700                  * and in6_pcbsetport in order to fill in the local address
  701                  * and the local port.
  702                  */
  703                 if (sin6->sin6_port == 0) {
  704                         error = EADDRNOTAVAIL;
  705                         goto release;
  706                 }
  707 
  708                 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
  709                         /* how about ::ffff:0.0.0.0 case? */
  710                         error = EISCONN;
  711                         goto release;
  712                 }
  713 
  714                 fport = sin6->sin6_port; /* allow 0 port */
  715 
  716                 if (IN6_IS_ADDR_V4MAPPED(faddr)) {
  717                         if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) {
  718                                 /*
  719                                  * I believe we should explicitly discard the
  720                                  * packet when mapped addresses are disabled,
  721                                  * rather than send the packet as an IPv6 one.
  722                                  * If we chose the latter approach, the packet
  723                                  * might be sent out on the wire based on the
  724                                  * default route, the situation which we'd
  725                                  * probably want to avoid.
  726                                  * (20010421 jinmei@kame.net)
  727                                  */
  728                                 error = EINVAL;
  729                                 goto release;
  730                         }
  731                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
  732                             !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) {
  733                                 /*
  734                                  * when remote addr is an IPv4-mapped address,
  735                                  * local addr should not be an IPv6 address,
  736                                  * since you cannot determine how to map IPv6
  737                                  * source address to IPv4.
  738                                  */
  739                                 error = EINVAL;
  740                                 goto release;
  741                         }
  742 
  743                         af = AF_INET;
  744                 }
  745 
  746                 if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
  747                         error = in6_selectsrc(sin6, optp, inp, NULL,
  748                             td->td_ucred, &oifp, &in6a);
  749                         if (error)
  750                                 goto release;
  751                         if (oifp && scope_ambiguous &&
  752                             (error = in6_setscope(&sin6->sin6_addr,
  753                             oifp, NULL))) {
  754                                 goto release;
  755                         }
  756                         laddr = &in6a;
  757                 } else
  758                         laddr = &inp->in6p_laddr;       /* XXX */
  759                 if (laddr == NULL) {
  760                         if (error == 0)
  761                                 error = EADDRNOTAVAIL;
  762                         goto release;
  763                 }
  764                 if (inp->inp_lport == 0 &&
  765                     (error = in6_pcbsetport(laddr, inp, td->td_ucred)) != 0) {
  766                         /* Undo an address bind that may have occurred. */
  767                         inp->in6p_laddr = in6addr_any;
  768                         goto release;
  769                 }
  770         } else {
  771                 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
  772                         error = ENOTCONN;
  773                         goto release;
  774                 }
  775                 if (IN6_IS_ADDR_V4MAPPED(&inp->in6p_faddr)) {
  776                         if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) {
  777                                 /*
  778                                  * XXX: this case would happen when the
  779                                  * application sets the V6ONLY flag after
  780                                  * connecting the foreign address.
  781                                  * Such applications should be fixed,
  782                                  * so we bark here.
  783                                  */
  784                                 log(LOG_INFO, "udp6_output: IPV6_V6ONLY "
  785                                     "option was set for a connected socket\n");
  786                                 error = EINVAL;
  787                                 goto release;
  788                         } else
  789                                 af = AF_INET;
  790                 }
  791                 laddr = &inp->in6p_laddr;
  792                 faddr = &inp->in6p_faddr;
  793                 fport = inp->inp_fport;
  794         }
  795 
  796         if (af == AF_INET)
  797                 hlen = sizeof(struct ip);
  798 
  799         /*
  800          * Calculate data length and get a mbuf
  801          * for UDP and IP6 headers.
  802          */
  803         M_PREPEND(m, hlen + sizeof(struct udphdr), M_NOWAIT);
  804         if (m == 0) {
  805                 error = ENOBUFS;
  806                 goto release;
  807         }
  808 
  809         /*
  810          * Stuff checksum and output datagram.
  811          */
  812         nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
  813             IPPROTO_UDP : IPPROTO_UDPLITE;
  814         udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
  815         udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */
  816         udp6->uh_dport = fport;
  817         if (nxt == IPPROTO_UDPLITE) {
  818                 struct udpcb *up;
  819 
  820                 up = intoudpcb(inp);
  821                 cscov = up->u_txcslen;
  822                 if (cscov >= plen)
  823                         cscov = 0;
  824                 udp6->uh_ulen = htons(cscov);
  825                 /*
  826                  * For UDP-Lite, checksum coverage length of zero means
  827                  * the entire UDPLite packet is covered by the checksum.
  828                  */
  829                 cscov_partial = (cscov == 0) ? 0 : 1;
  830         } else if (plen <= 0xffff)
  831                 udp6->uh_ulen = htons((u_short)plen);
  832         else
  833                 udp6->uh_ulen = 0;
  834         udp6->uh_sum = 0;
  835 
  836         switch (af) {
  837         case AF_INET6:
  838                 ip6 = mtod(m, struct ip6_hdr *);
  839                 ip6->ip6_flow   = inp->inp_flow & IPV6_FLOWINFO_MASK;
  840                 ip6->ip6_vfc    &= ~IPV6_VERSION_MASK;
  841                 ip6->ip6_vfc    |= IPV6_VERSION;
  842                 ip6->ip6_plen   = htons((u_short)plen);
  843                 ip6->ip6_nxt    = nxt;
  844                 ip6->ip6_hlim   = in6_selecthlim(inp, NULL);
  845                 ip6->ip6_src    = *laddr;
  846                 ip6->ip6_dst    = *faddr;
  847 
  848                 if (cscov_partial) {
  849                         if ((udp6->uh_sum = in6_cksum_partial(m, nxt,
  850                             sizeof(struct ip6_hdr), plen, cscov)) == 0)
  851                                 udp6->uh_sum = 0xffff;
  852                 } else {
  853                         udp6->uh_sum = in6_cksum_pseudo(ip6, plen, nxt, 0);
  854                         m->m_pkthdr.csum_flags = CSUM_UDP_IPV6;
  855                         m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
  856                 }
  857 
  858                 flags = 0;
  859 
  860                 UDP_PROBE(send, NULL, inp, ip6, inp, udp6);
  861                 UDPSTAT_INC(udps_opackets);
  862                 error = ip6_output(m, optp, NULL, flags, inp->in6p_moptions,
  863                     NULL, inp);
  864                 break;
  865         case AF_INET:
  866                 error = EAFNOSUPPORT;
  867                 goto release;
  868         }
  869         goto releaseopt;
  870 
  871 release:
  872         m_freem(m);
  873 
  874 releaseopt:
  875         if (control) {
  876                 ip6_clearpktopts(&opt, -1);
  877                 m_freem(control);
  878         }
  879         return (error);
  880 }
  881 
  882 static void
  883 udp6_abort(struct socket *so)
  884 {
  885         struct inpcb *inp;
  886         struct inpcbinfo *pcbinfo;
  887 
  888         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
  889         inp = sotoinpcb(so);
  890         KASSERT(inp != NULL, ("udp6_abort: inp == NULL"));
  891 
  892 #ifdef INET
  893         if (inp->inp_vflag & INP_IPV4) {
  894                 struct pr_usrreqs *pru;
  895 
  896                 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
  897                 (*pru->pru_abort)(so);
  898                 return;
  899         }
  900 #endif
  901 
  902         INP_WLOCK(inp);
  903         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
  904                 INP_HASH_WLOCK(pcbinfo);
  905                 in6_pcbdisconnect(inp);
  906                 inp->in6p_laddr = in6addr_any;
  907                 INP_HASH_WUNLOCK(pcbinfo);
  908                 soisdisconnected(so);
  909         }
  910         INP_WUNLOCK(inp);
  911 }
  912 
  913 static int
  914 udp6_attach(struct socket *so, int proto, struct thread *td)
  915 {
  916         struct inpcb *inp;
  917         struct inpcbinfo *pcbinfo;
  918         int error;
  919 
  920         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
  921         inp = sotoinpcb(so);
  922         KASSERT(inp == NULL, ("udp6_attach: inp != NULL"));
  923 
  924         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
  925                 error = soreserve(so, udp_sendspace, udp_recvspace);
  926                 if (error)
  927                         return (error);
  928         }
  929         INP_INFO_WLOCK(pcbinfo);
  930         error = in_pcballoc(so, pcbinfo);
  931         if (error) {
  932                 INP_INFO_WUNLOCK(pcbinfo);
  933                 return (error);
  934         }
  935         inp = (struct inpcb *)so->so_pcb;
  936         inp->inp_vflag |= INP_IPV6;
  937         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
  938                 inp->inp_vflag |= INP_IPV4;
  939         inp->in6p_hops = -1;    /* use kernel default */
  940         inp->in6p_cksum = -1;   /* just to be sure */
  941         /*
  942          * XXX: ugly!!
  943          * IPv4 TTL initialization is necessary for an IPv6 socket as well,
  944          * because the socket may be bound to an IPv6 wildcard address,
  945          * which may match an IPv4-mapped IPv6 address.
  946          */
  947         inp->inp_ip_ttl = V_ip_defttl;
  948 
  949         error = udp_newudpcb(inp);
  950         if (error) {
  951                 in_pcbdetach(inp);
  952                 in_pcbfree(inp);
  953                 INP_INFO_WUNLOCK(pcbinfo);
  954                 return (error);
  955         }
  956         INP_WUNLOCK(inp);
  957         INP_INFO_WUNLOCK(pcbinfo);
  958         return (0);
  959 }
  960 
  961 static int
  962 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
  963 {
  964         struct inpcb *inp;
  965         struct inpcbinfo *pcbinfo;
  966         int error;
  967 
  968         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
  969         inp = sotoinpcb(so);
  970         KASSERT(inp != NULL, ("udp6_bind: inp == NULL"));
  971 
  972         INP_WLOCK(inp);
  973         INP_HASH_WLOCK(pcbinfo);
  974         inp->inp_vflag &= ~INP_IPV4;
  975         inp->inp_vflag |= INP_IPV6;
  976         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
  977                 struct sockaddr_in6 *sin6_p;
  978 
  979                 sin6_p = (struct sockaddr_in6 *)nam;
  980 
  981                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
  982                         inp->inp_vflag |= INP_IPV4;
  983 #ifdef INET
  984                 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
  985                         struct sockaddr_in sin;
  986 
  987                         in6_sin6_2_sin(&sin, sin6_p);
  988                         inp->inp_vflag |= INP_IPV4;
  989                         inp->inp_vflag &= ~INP_IPV6;
  990                         error = in_pcbbind(inp, (struct sockaddr *)&sin,
  991                             td->td_ucred);
  992                         goto out;
  993                 }
  994 #endif
  995         }
  996 
  997         error = in6_pcbbind(inp, nam, td->td_ucred);
  998 #ifdef INET
  999 out:
 1000 #endif
 1001         INP_HASH_WUNLOCK(pcbinfo);
 1002         INP_WUNLOCK(inp);
 1003         return (error);
 1004 }
 1005 
 1006 static void
 1007 udp6_close(struct socket *so)
 1008 {
 1009         struct inpcb *inp;
 1010         struct inpcbinfo *pcbinfo;
 1011 
 1012         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
 1013         inp = sotoinpcb(so);
 1014         KASSERT(inp != NULL, ("udp6_close: inp == NULL"));
 1015 
 1016 #ifdef INET
 1017         if (inp->inp_vflag & INP_IPV4) {
 1018                 struct pr_usrreqs *pru;
 1019 
 1020                 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
 1021                 (*pru->pru_disconnect)(so);
 1022                 return;
 1023         }
 1024 #endif
 1025         INP_WLOCK(inp);
 1026         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 1027                 INP_HASH_WLOCK(pcbinfo);
 1028                 in6_pcbdisconnect(inp);
 1029                 inp->in6p_laddr = in6addr_any;
 1030                 INP_HASH_WUNLOCK(pcbinfo);
 1031                 soisdisconnected(so);
 1032         }
 1033         INP_WUNLOCK(inp);
 1034 }
 1035 
 1036 static int
 1037 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 1038 {
 1039         struct inpcb *inp;
 1040         struct inpcbinfo *pcbinfo;
 1041         struct sockaddr_in6 *sin6;
 1042         int error;
 1043 
 1044         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
 1045         inp = sotoinpcb(so);
 1046         sin6 = (struct sockaddr_in6 *)nam;
 1047         KASSERT(inp != NULL, ("udp6_connect: inp == NULL"));
 1048 
 1049         /*
 1050          * XXXRW: Need to clarify locking of v4/v6 flags.
 1051          */
 1052         INP_WLOCK(inp);
 1053 #ifdef INET
 1054         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 1055                 struct sockaddr_in sin;
 1056 
 1057                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
 1058                         error = EINVAL;
 1059                         goto out;
 1060                 }
 1061                 if (inp->inp_faddr.s_addr != INADDR_ANY) {
 1062                         error = EISCONN;
 1063                         goto out;
 1064                 }
 1065                 in6_sin6_2_sin(&sin, sin6);
 1066                 inp->inp_vflag |= INP_IPV4;
 1067                 inp->inp_vflag &= ~INP_IPV6;
 1068                 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr);
 1069                 if (error != 0)
 1070                         goto out;
 1071                 INP_HASH_WLOCK(pcbinfo);
 1072                 error = in_pcbconnect(inp, (struct sockaddr *)&sin,
 1073                     td->td_ucred);
 1074                 INP_HASH_WUNLOCK(pcbinfo);
 1075                 if (error == 0)
 1076                         soisconnected(so);
 1077                 goto out;
 1078         }
 1079 #endif
 1080         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 1081                 error = EISCONN;
 1082                 goto out;
 1083         }
 1084         inp->inp_vflag &= ~INP_IPV4;
 1085         inp->inp_vflag |= INP_IPV6;
 1086         error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr);
 1087         if (error != 0)
 1088                 goto out;
 1089         INP_HASH_WLOCK(pcbinfo);
 1090         error = in6_pcbconnect(inp, nam, td->td_ucred);
 1091         INP_HASH_WUNLOCK(pcbinfo);
 1092         if (error == 0)
 1093                 soisconnected(so);
 1094 out:
 1095         INP_WUNLOCK(inp);
 1096         return (error);
 1097 }
 1098 
 1099 static void
 1100 udp6_detach(struct socket *so)
 1101 {
 1102         struct inpcb *inp;
 1103         struct inpcbinfo *pcbinfo;
 1104         struct udpcb *up;
 1105 
 1106         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
 1107         inp = sotoinpcb(so);
 1108         KASSERT(inp != NULL, ("udp6_detach: inp == NULL"));
 1109 
 1110         INP_INFO_WLOCK(pcbinfo);
 1111         INP_WLOCK(inp);
 1112         up = intoudpcb(inp);
 1113         KASSERT(up != NULL, ("%s: up == NULL", __func__));
 1114         in_pcbdetach(inp);
 1115         in_pcbfree(inp);
 1116         INP_INFO_WUNLOCK(pcbinfo);
 1117         udp_discardcb(up);
 1118 }
 1119 
 1120 static int
 1121 udp6_disconnect(struct socket *so)
 1122 {
 1123         struct inpcb *inp;
 1124         struct inpcbinfo *pcbinfo;
 1125         int error;
 1126 
 1127         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
 1128         inp = sotoinpcb(so);
 1129         KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL"));
 1130 
 1131 #ifdef INET
 1132         if (inp->inp_vflag & INP_IPV4) {
 1133                 struct pr_usrreqs *pru;
 1134 
 1135                 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
 1136                 (void)(*pru->pru_disconnect)(so);
 1137                 return (0);
 1138         }
 1139 #endif
 1140 
 1141         INP_WLOCK(inp);
 1142 
 1143         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 1144                 error = ENOTCONN;
 1145                 goto out;
 1146         }
 1147 
 1148         INP_HASH_WLOCK(pcbinfo);
 1149         in6_pcbdisconnect(inp);
 1150         inp->in6p_laddr = in6addr_any;
 1151         INP_HASH_WUNLOCK(pcbinfo);
 1152         SOCK_LOCK(so);
 1153         so->so_state &= ~SS_ISCONNECTED;                /* XXX */
 1154         SOCK_UNLOCK(so);
 1155 out:
 1156         INP_WUNLOCK(inp);
 1157         return (0);
 1158 }
 1159 
 1160 static int
 1161 udp6_send(struct socket *so, int flags, struct mbuf *m,
 1162     struct sockaddr *addr, struct mbuf *control, struct thread *td)
 1163 {
 1164         struct inpcb *inp;
 1165         struct inpcbinfo *pcbinfo;
 1166         int error = 0;
 1167 
 1168         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
 1169         inp = sotoinpcb(so);
 1170         KASSERT(inp != NULL, ("udp6_send: inp == NULL"));
 1171 
 1172         INP_WLOCK(inp);
 1173         if (addr) {
 1174                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 1175                         error = EINVAL;
 1176                         goto bad;
 1177                 }
 1178                 if (addr->sa_family != AF_INET6) {
 1179                         error = EAFNOSUPPORT;
 1180                         goto bad;
 1181                 }
 1182         }
 1183 
 1184 #ifdef INET
 1185         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
 1186                 int hasv4addr;
 1187                 struct sockaddr_in6 *sin6 = 0;
 1188 
 1189                 if (addr == 0)
 1190                         hasv4addr = (inp->inp_vflag & INP_IPV4);
 1191                 else {
 1192                         sin6 = (struct sockaddr_in6 *)addr;
 1193                         hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
 1194                             ? 1 : 0;
 1195                 }
 1196                 if (hasv4addr) {
 1197                         struct pr_usrreqs *pru;
 1198 
 1199                         /*
 1200                          * XXXRW: We release UDP-layer locks before calling
 1201                          * udp_send() in order to avoid recursion.  However,
 1202                          * this does mean there is a short window where inp's
 1203                          * fields are unstable.  Could this lead to a
 1204                          * potential race in which the factors causing us to
 1205                          * select the UDPv4 output routine are invalidated?
 1206                          */
 1207                         INP_WUNLOCK(inp);
 1208                         if (sin6)
 1209                                 in6_sin6_2_sin_in_sock(addr);
 1210                         pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
 1211                         /* addr will just be freed in sendit(). */
 1212                         return ((*pru->pru_send)(so, flags, m, addr, control,
 1213                             td));
 1214                 }
 1215         }
 1216 #endif
 1217 #ifdef MAC
 1218         mac_inpcb_create_mbuf(inp, m);
 1219 #endif
 1220         INP_HASH_WLOCK(pcbinfo);
 1221         error = udp6_output(inp, m, addr, control, td);
 1222         INP_HASH_WUNLOCK(pcbinfo);
 1223 #ifdef INET
 1224 #endif  
 1225         INP_WUNLOCK(inp);
 1226         return (error);
 1227 
 1228 bad:
 1229         INP_WUNLOCK(inp);
 1230         m_freem(m);
 1231         return (error);
 1232 }
 1233 
 1234 struct pr_usrreqs udp6_usrreqs = {
 1235         .pru_abort =            udp6_abort,
 1236         .pru_attach =           udp6_attach,
 1237         .pru_bind =             udp6_bind,
 1238         .pru_connect =          udp6_connect,
 1239         .pru_control =          in6_control,
 1240         .pru_detach =           udp6_detach,
 1241         .pru_disconnect =       udp6_disconnect,
 1242         .pru_peeraddr =         in6_mapped_peeraddr,
 1243         .pru_send =             udp6_send,
 1244         .pru_shutdown =         udp_shutdown,
 1245         .pru_sockaddr =         in6_mapped_sockaddr,
 1246         .pru_soreceive =        soreceive_dgram,
 1247         .pru_sosend =           sosend_dgram,
 1248         .pru_sosetlabel =       in_pcbsosetlabel,
 1249         .pru_close =            udp6_close
 1250 };

Cache object: 353f3fc6b81699961ddeca189fc0a7e9


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