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


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

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    1 /*-
    2  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. Neither the name of the project nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      $KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 jinmei Exp $
   30  *      $KAME: udp6_output.c,v 1.31 2001/05/21 16:39:15 jinmei Exp $
   31  */
   32 
   33 /*-
   34  * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
   35  *      The Regents of the University of California.
   36  * All rights reserved.
   37  *
   38  * Redistribution and use in source and binary forms, with or without
   39  * modification, are permitted provided that the following conditions
   40  * are met:
   41  * 1. Redistributions of source code must retain the above copyright
   42  *    notice, this list of conditions and the following disclaimer.
   43  * 2. Redistributions in binary form must reproduce the above copyright
   44  *    notice, this list of conditions and the following disclaimer in the
   45  *    documentation and/or other materials provided with the distribution.
   46  * 4. Neither the name of the University nor the names of its contributors
   47  *    may be used to endorse or promote products derived from this software
   48  *    without specific prior written permission.
   49  *
   50  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   51  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   52  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   53  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   54  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   55  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   56  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   57  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   58  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   59  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   60  * SUCH DAMAGE.
   61  *
   62  *      @(#)udp_usrreq.c        8.6 (Berkeley) 5/23/95
   63  */
   64 
   65 #include <sys/cdefs.h>
   66 __FBSDID("$FreeBSD: releng/8.1/sys/netinet6/udp6_usrreq.c 196019 2009-08-01 19:26:27Z rwatson $");
   67 
   68 #include "opt_inet.h"
   69 #include "opt_inet6.h"
   70 #include "opt_ipsec.h"
   71 
   72 #include <sys/param.h>
   73 #include <sys/jail.h>
   74 #include <sys/kernel.h>
   75 #include <sys/lock.h>
   76 #include <sys/mbuf.h>
   77 #include <sys/priv.h>
   78 #include <sys/proc.h>
   79 #include <sys/protosw.h>
   80 #include <sys/signalvar.h>
   81 #include <sys/socket.h>
   82 #include <sys/socketvar.h>
   83 #include <sys/sx.h>
   84 #include <sys/sysctl.h>
   85 #include <sys/syslog.h>
   86 #include <sys/systm.h>
   87 
   88 #include <net/if.h>
   89 #include <net/if_types.h>
   90 #include <net/route.h>
   91 
   92 #include <netinet/in.h>
   93 #include <netinet/in_pcb.h>
   94 #include <netinet/in_systm.h>
   95 #include <netinet/in_var.h>
   96 #include <netinet/ip.h>
   97 #include <netinet/ip_icmp.h>
   98 #include <netinet/ip6.h>
   99 #include <netinet/icmp_var.h>
  100 #include <netinet/icmp6.h>
  101 #include <netinet/ip_var.h>
  102 #include <netinet/udp.h>
  103 #include <netinet/udp_var.h>
  104 
  105 #include <netinet6/ip6protosw.h>
  106 #include <netinet6/ip6_var.h>
  107 #include <netinet6/in6_pcb.h>
  108 #include <netinet6/udp6_var.h>
  109 #include <netinet6/scope6_var.h>
  110 
  111 #ifdef IPSEC
  112 #include <netipsec/ipsec.h>
  113 #include <netipsec/ipsec6.h>
  114 #endif /* IPSEC */
  115 
  116 #include <security/mac/mac_framework.h>
  117 
  118 /*
  119  * UDP protocol implementation.
  120  * Per RFC 768, August, 1980.
  121  */
  122 
  123 extern struct protosw   inetsw[];
  124 static void             udp6_detach(struct socket *so);
  125 
  126 static void
  127 udp6_append(struct inpcb *inp, struct mbuf *n, int off,
  128     struct sockaddr_in6 *fromsa)
  129 {
  130         struct socket *so;
  131         struct mbuf *opts;
  132 
  133         INP_LOCK_ASSERT(inp);
  134 
  135 #ifdef IPSEC
  136         /* Check AH/ESP integrity. */
  137         if (ipsec6_in_reject(n, inp)) {
  138                 m_freem(n);
  139                 V_ipsec6stat.in_polvio++;
  140                 return;
  141         }
  142 #endif /* IPSEC */
  143 #ifdef MAC
  144         if (mac_inpcb_check_deliver(inp, n) != 0) {
  145                 m_freem(n);
  146                 return;
  147         }
  148 #endif
  149         opts = NULL;
  150         if (inp->inp_flags & INP_CONTROLOPTS ||
  151             inp->inp_socket->so_options & SO_TIMESTAMP)
  152                 ip6_savecontrol(inp, n, &opts);
  153         m_adj(n, off + sizeof(struct udphdr));
  154 
  155         so = inp->inp_socket;
  156         SOCKBUF_LOCK(&so->so_rcv);
  157         if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)fromsa, n,
  158             opts) == 0) {
  159                 SOCKBUF_UNLOCK(&so->so_rcv);
  160                 m_freem(n);
  161                 if (opts)
  162                         m_freem(opts);
  163                 UDPSTAT_INC(udps_fullsock);
  164         } else
  165                 sorwakeup_locked(so);
  166 }
  167 
  168 int
  169 udp6_input(struct mbuf **mp, int *offp, int proto)
  170 {
  171         struct mbuf *m = *mp;
  172         struct ifnet *ifp;
  173         struct ip6_hdr *ip6;
  174         struct udphdr *uh;
  175         struct inpcb *inp;
  176         struct udpcb *up;
  177         int off = *offp;
  178         int plen, ulen;
  179         struct sockaddr_in6 fromsa;
  180 
  181         ifp = m->m_pkthdr.rcvif;
  182         ip6 = mtod(m, struct ip6_hdr *);
  183 
  184         if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
  185                 /* XXX send icmp6 host/port unreach? */
  186                 m_freem(m);
  187                 return (IPPROTO_DONE);
  188         }
  189 
  190 #ifndef PULLDOWN_TEST
  191         IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
  192         ip6 = mtod(m, struct ip6_hdr *);
  193         uh = (struct udphdr *)((caddr_t)ip6 + off);
  194 #else
  195         IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh));
  196         if (!uh)
  197                 return (IPPROTO_DONE);
  198 #endif
  199 
  200         UDPSTAT_INC(udps_ipackets);
  201 
  202         /*
  203          * Destination port of 0 is illegal, based on RFC768.
  204          */
  205         if (uh->uh_dport == 0)
  206                 goto badunlocked;
  207 
  208         plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
  209         ulen = ntohs((u_short)uh->uh_ulen);
  210 
  211         if (plen != ulen) {
  212                 UDPSTAT_INC(udps_badlen);
  213                 goto badunlocked;
  214         }
  215 
  216         /*
  217          * Checksum extended UDP header and data.
  218          */
  219         if (uh->uh_sum == 0) {
  220                 UDPSTAT_INC(udps_nosum);
  221                 goto badunlocked;
  222         }
  223         if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
  224                 UDPSTAT_INC(udps_badsum);
  225                 goto badunlocked;
  226         }
  227 
  228         /*
  229          * Construct sockaddr format source address.
  230          */
  231         init_sin6(&fromsa, m);
  232         fromsa.sin6_port = uh->uh_sport;
  233 
  234         INP_INFO_RLOCK(&V_udbinfo);
  235         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
  236                 struct inpcb *last;
  237                 struct ip6_moptions *imo;
  238 
  239                 /*
  240                  * In the event that laddr should be set to the link-local
  241                  * address (this happens in RIPng), the multicast address
  242                  * specified in the received packet will not match laddr.  To
  243                  * handle this situation, matching is relaxed if the
  244                  * receiving interface is the same as one specified in the
  245                  * socket and if the destination multicast address matches
  246                  * one of the multicast groups specified in the socket.
  247                  */
  248 
  249                 /*
  250                  * KAME note: traditionally we dropped udpiphdr from mbuf
  251                  * here.  We need udphdr for IPsec processing so we do that
  252                  * later.
  253                  */
  254                 last = NULL;
  255                 LIST_FOREACH(inp, &V_udb, inp_list) {
  256                         if ((inp->inp_vflag & INP_IPV6) == 0)
  257                                 continue;
  258                         if (inp->inp_lport != uh->uh_dport)
  259                                 continue;
  260                         if (inp->inp_fport != 0 &&
  261                             inp->inp_fport != uh->uh_sport)
  262                                 continue;
  263                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
  264                                 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
  265                                                         &ip6->ip6_dst))
  266                                         continue;
  267                         }
  268                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
  269                                 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
  270                                                         &ip6->ip6_src) ||
  271                                     inp->inp_fport != uh->uh_sport)
  272                                         continue;
  273                         }
  274 
  275                         /*
  276                          * Handle socket delivery policy for any-source
  277                          * and source-specific multicast. [RFC3678]
  278                          */
  279                         imo = inp->in6p_moptions;
  280                         if (imo && IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
  281                                 struct sockaddr_in6      mcaddr;
  282                                 int                      blocked;
  283 
  284                                 INP_RLOCK(inp);
  285 
  286                                 bzero(&mcaddr, sizeof(struct sockaddr_in6));
  287                                 mcaddr.sin6_len = sizeof(struct sockaddr_in6);
  288                                 mcaddr.sin6_family = AF_INET6;
  289                                 mcaddr.sin6_addr = ip6->ip6_dst;
  290 
  291                                 blocked = im6o_mc_filter(imo, ifp,
  292                                         (struct sockaddr *)&mcaddr,
  293                                         (struct sockaddr *)&fromsa);
  294                                 if (blocked != MCAST_PASS) {
  295                                         if (blocked == MCAST_NOTGMEMBER)
  296                                                 IP6STAT_INC(ip6s_notmember);
  297                                         if (blocked == MCAST_NOTSMEMBER ||
  298                                             blocked == MCAST_MUTED)
  299                                                 UDPSTAT_INC(udps_filtermcast);
  300                                         INP_RUNLOCK(inp); /* XXX */
  301                                         continue;
  302                                 }
  303 
  304                                 INP_RUNLOCK(inp);
  305                         }
  306                         if (last != NULL) {
  307                                 struct mbuf *n;
  308 
  309                                 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
  310                                         INP_RLOCK(last);
  311                                         up = intoudpcb(last);
  312                                         if (up->u_tun_func == NULL) {
  313                                                 udp6_append(last, n, off, &fromsa);
  314                                         } else {
  315                                                 /*
  316                                                  * Engage the tunneling
  317                                                  * protocol we will have to
  318                                                  * leave the info_lock up,
  319                                                  * since we are hunting
  320                                                  * through multiple UDP's.
  321                                                  * 
  322                                                  */
  323                                                 (*up->u_tun_func)(n, off, last);
  324                                         }
  325                                         INP_RUNLOCK(last);
  326                                 }
  327                         }
  328                         last = inp;
  329                         /*
  330                          * Don't look for additional matches if this one does
  331                          * not have either the SO_REUSEPORT or SO_REUSEADDR
  332                          * socket options set.  This heuristic avoids
  333                          * searching through all pcbs in the common case of a
  334                          * non-shared port.  It assumes that an application
  335                          * will never clear these options after setting them.
  336                          */
  337                         if ((last->inp_socket->so_options &
  338                              (SO_REUSEPORT|SO_REUSEADDR)) == 0)
  339                                 break;
  340                 }
  341 
  342                 if (last == NULL) {
  343                         /*
  344                          * No matching pcb found; discard datagram.  (No need
  345                          * to send an ICMP Port Unreachable for a broadcast
  346                          * or multicast datgram.)
  347                          */
  348                         UDPSTAT_INC(udps_noport);
  349                         UDPSTAT_INC(udps_noportmcast);
  350                         goto badheadlocked;
  351                 }
  352                 INP_RLOCK(last);
  353                 INP_INFO_RUNLOCK(&V_udbinfo);
  354                 up = intoudpcb(last);
  355                 if (up->u_tun_func == NULL) {
  356                         udp6_append(last, m, off, &fromsa);
  357                 } else {
  358                         /*
  359                          * Engage the tunneling protocol.
  360                          */
  361                         (*up->u_tun_func)(m, off, last);
  362                 }
  363                 INP_RUNLOCK(last);
  364                 return (IPPROTO_DONE);
  365         }
  366         /*
  367          * Locate pcb for datagram.
  368          */
  369         inp = in6_pcblookup_hash(&V_udbinfo, &ip6->ip6_src, uh->uh_sport,
  370             &ip6->ip6_dst, uh->uh_dport, 1, m->m_pkthdr.rcvif);
  371         if (inp == NULL) {
  372                 if (udp_log_in_vain) {
  373                         char ip6bufs[INET6_ADDRSTRLEN];
  374                         char ip6bufd[INET6_ADDRSTRLEN];
  375 
  376                         log(LOG_INFO,
  377                             "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
  378                             ip6_sprintf(ip6bufd, &ip6->ip6_dst),
  379                             ntohs(uh->uh_dport),
  380                             ip6_sprintf(ip6bufs, &ip6->ip6_src),
  381                             ntohs(uh->uh_sport));
  382                 }
  383                 UDPSTAT_INC(udps_noport);
  384                 if (m->m_flags & M_MCAST) {
  385                         printf("UDP6: M_MCAST is set in a unicast packet.\n");
  386                         UDPSTAT_INC(udps_noportmcast);
  387                         goto badheadlocked;
  388                 }
  389                 INP_INFO_RUNLOCK(&V_udbinfo);
  390                 if (V_udp_blackhole)
  391                         goto badunlocked;
  392                 if (badport_bandlim(BANDLIM_ICMP6_UNREACH) < 0)
  393                         goto badunlocked;
  394                 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
  395                 return (IPPROTO_DONE);
  396         }
  397         INP_RLOCK(inp);
  398         INP_INFO_RUNLOCK(&V_udbinfo);
  399         up = intoudpcb(inp);
  400         if (up->u_tun_func == NULL) {
  401                 udp6_append(inp, m, off, &fromsa);
  402         } else {
  403                 /*
  404                  * Engage the tunneling protocol.
  405                  */
  406 
  407                 (*up->u_tun_func)(m, off, inp);
  408         }
  409         INP_RUNLOCK(inp);
  410         return (IPPROTO_DONE);
  411 
  412 badheadlocked:
  413         INP_INFO_RUNLOCK(&V_udbinfo);
  414 badunlocked:
  415         if (m)
  416                 m_freem(m);
  417         return (IPPROTO_DONE);
  418 }
  419 
  420 void
  421 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d)
  422 {
  423         struct udphdr uh;
  424         struct ip6_hdr *ip6;
  425         struct mbuf *m;
  426         int off = 0;
  427         struct ip6ctlparam *ip6cp = NULL;
  428         const struct sockaddr_in6 *sa6_src = NULL;
  429         void *cmdarg;
  430         struct inpcb *(*notify)(struct inpcb *, int) = udp_notify;
  431         struct udp_portonly {
  432                 u_int16_t uh_sport;
  433                 u_int16_t uh_dport;
  434         } *uhp;
  435 
  436         if (sa->sa_family != AF_INET6 ||
  437             sa->sa_len != sizeof(struct sockaddr_in6))
  438                 return;
  439 
  440         if ((unsigned)cmd >= PRC_NCMDS)
  441                 return;
  442         if (PRC_IS_REDIRECT(cmd))
  443                 notify = in6_rtchange, d = NULL;
  444         else if (cmd == PRC_HOSTDEAD)
  445                 d = NULL;
  446         else if (inet6ctlerrmap[cmd] == 0)
  447                 return;
  448 
  449         /* if the parameter is from icmp6, decode it. */
  450         if (d != NULL) {
  451                 ip6cp = (struct ip6ctlparam *)d;
  452                 m = ip6cp->ip6c_m;
  453                 ip6 = ip6cp->ip6c_ip6;
  454                 off = ip6cp->ip6c_off;
  455                 cmdarg = ip6cp->ip6c_cmdarg;
  456                 sa6_src = ip6cp->ip6c_src;
  457         } else {
  458                 m = NULL;
  459                 ip6 = NULL;
  460                 cmdarg = NULL;
  461                 sa6_src = &sa6_any;
  462         }
  463 
  464         if (ip6) {
  465                 /*
  466                  * XXX: We assume that when IPV6 is non NULL,
  467                  * M and OFF are valid.
  468                  */
  469 
  470                 /* Check if we can safely examine src and dst ports. */
  471                 if (m->m_pkthdr.len < off + sizeof(*uhp))
  472                         return;
  473 
  474                 bzero(&uh, sizeof(uh));
  475                 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
  476 
  477                 (void) in6_pcbnotify(&V_udbinfo, sa, uh.uh_dport,
  478                     (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd,
  479                     cmdarg, notify);
  480         } else
  481                 (void) in6_pcbnotify(&V_udbinfo, sa, 0,
  482                     (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
  483 }
  484 
  485 static int
  486 udp6_getcred(SYSCTL_HANDLER_ARGS)
  487 {
  488         struct xucred xuc;
  489         struct sockaddr_in6 addrs[2];
  490         struct inpcb *inp;
  491         int error;
  492 
  493         error = priv_check(req->td, PRIV_NETINET_GETCRED);
  494         if (error)
  495                 return (error);
  496 
  497         if (req->newlen != sizeof(addrs))
  498                 return (EINVAL);
  499         if (req->oldlen != sizeof(struct xucred))
  500                 return (EINVAL);
  501         error = SYSCTL_IN(req, addrs, sizeof(addrs));
  502         if (error)
  503                 return (error);
  504         if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 ||
  505             (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) {
  506                 return (error);
  507         }
  508         INP_INFO_RLOCK(&V_udbinfo);
  509         inp = in6_pcblookup_hash(&V_udbinfo, &addrs[1].sin6_addr,
  510             addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port, 1,
  511             NULL);
  512         if (inp != NULL) {
  513                 INP_RLOCK(inp);
  514                 INP_INFO_RUNLOCK(&V_udbinfo);
  515                 if (inp->inp_socket == NULL)
  516                         error = ENOENT;
  517                 if (error == 0)
  518                         error = cr_canseesocket(req->td->td_ucred,
  519                             inp->inp_socket);
  520                 if (error == 0)
  521                         cru2x(inp->inp_cred, &xuc);
  522                 INP_RUNLOCK(inp);
  523         } else {
  524                 INP_INFO_RUNLOCK(&V_udbinfo);
  525                 error = ENOENT;
  526         }
  527         if (error == 0)
  528                 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
  529         return (error);
  530 }
  531 
  532 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0,
  533     0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection");
  534 
  535 static int
  536 udp6_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr6,
  537     struct mbuf *control, struct thread *td)
  538 {
  539         u_int32_t ulen = m->m_pkthdr.len;
  540         u_int32_t plen = sizeof(struct udphdr) + ulen;
  541         struct ip6_hdr *ip6;
  542         struct udphdr *udp6;
  543         struct in6_addr *laddr, *faddr, in6a;
  544         struct sockaddr_in6 *sin6 = NULL;
  545         struct ifnet *oifp = NULL;
  546         int scope_ambiguous = 0;
  547         u_short fport;
  548         int error = 0;
  549         struct ip6_pktopts *optp, opt;
  550         int af = AF_INET6, hlen = sizeof(struct ip6_hdr);
  551         int flags;
  552         struct sockaddr_in6 tmp;
  553 
  554         INP_WLOCK_ASSERT(inp);
  555 
  556         if (addr6) {
  557                 /* addr6 has been validated in udp6_send(). */
  558                 sin6 = (struct sockaddr_in6 *)addr6;
  559 
  560                 /* protect *sin6 from overwrites */
  561                 tmp = *sin6;
  562                 sin6 = &tmp;
  563 
  564                 /*
  565                  * Application should provide a proper zone ID or the use of
  566                  * default zone IDs should be enabled.  Unfortunately, some
  567                  * applications do not behave as it should, so we need a
  568                  * workaround.  Even if an appropriate ID is not determined,
  569                  * we'll see if we can determine the outgoing interface.  If we
  570                  * can, determine the zone ID based on the interface below.
  571                  */
  572                 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone)
  573                         scope_ambiguous = 1;
  574                 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
  575                         return (error);
  576         }
  577 
  578         if (control) {
  579                 if ((error = ip6_setpktopts(control, &opt,
  580                     inp->in6p_outputopts, td->td_ucred, IPPROTO_UDP)) != 0)
  581                         goto release;
  582                 optp = &opt;
  583         } else
  584                 optp = inp->in6p_outputopts;
  585 
  586         if (sin6) {
  587                 faddr = &sin6->sin6_addr;
  588 
  589                 /*
  590                  * IPv4 version of udp_output calls in_pcbconnect in this case,
  591                  * which needs splnet and affects performance.
  592                  * Since we saw no essential reason for calling in_pcbconnect,
  593                  * we get rid of such kind of logic, and call in6_selectsrc
  594                  * and in6_pcbsetport in order to fill in the local address
  595                  * and the local port.
  596                  */
  597                 if (sin6->sin6_port == 0) {
  598                         error = EADDRNOTAVAIL;
  599                         goto release;
  600                 }
  601 
  602                 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
  603                         /* how about ::ffff:0.0.0.0 case? */
  604                         error = EISCONN;
  605                         goto release;
  606                 }
  607 
  608                 fport = sin6->sin6_port; /* allow 0 port */
  609 
  610                 if (IN6_IS_ADDR_V4MAPPED(faddr)) {
  611                         if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) {
  612                                 /*
  613                                  * I believe we should explicitly discard the
  614                                  * packet when mapped addresses are disabled,
  615                                  * rather than send the packet as an IPv6 one.
  616                                  * If we chose the latter approach, the packet
  617                                  * might be sent out on the wire based on the
  618                                  * default route, the situation which we'd
  619                                  * probably want to avoid.
  620                                  * (20010421 jinmei@kame.net)
  621                                  */
  622                                 error = EINVAL;
  623                                 goto release;
  624                         }
  625                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
  626                             !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) {
  627                                 /*
  628                                  * when remote addr is an IPv4-mapped address,
  629                                  * local addr should not be an IPv6 address,
  630                                  * since you cannot determine how to map IPv6
  631                                  * source address to IPv4.
  632                                  */
  633                                 error = EINVAL;
  634                                 goto release;
  635                         }
  636 
  637                         af = AF_INET;
  638                 }
  639 
  640                 if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
  641                         error = in6_selectsrc(sin6, optp, inp, NULL,
  642                             td->td_ucred, &oifp, &in6a);
  643                         if (error)
  644                                 goto release;
  645                         if (oifp && scope_ambiguous &&
  646                             (error = in6_setscope(&sin6->sin6_addr,
  647                             oifp, NULL))) {
  648                                 goto release;
  649                         }
  650                         laddr = &in6a;
  651                 } else
  652                         laddr = &inp->in6p_laddr;       /* XXX */
  653                 if (laddr == NULL) {
  654                         if (error == 0)
  655                                 error = EADDRNOTAVAIL;
  656                         goto release;
  657                 }
  658                 if (inp->inp_lport == 0 &&
  659                     (error = in6_pcbsetport(laddr, inp, td->td_ucred)) != 0)
  660                         goto release;
  661         } else {
  662                 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
  663                         error = ENOTCONN;
  664                         goto release;
  665                 }
  666                 if (IN6_IS_ADDR_V4MAPPED(&inp->in6p_faddr)) {
  667                         if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) {
  668                                 /*
  669                                  * XXX: this case would happen when the
  670                                  * application sets the V6ONLY flag after
  671                                  * connecting the foreign address.
  672                                  * Such applications should be fixed,
  673                                  * so we bark here.
  674                                  */
  675                                 log(LOG_INFO, "udp6_output: IPV6_V6ONLY "
  676                                     "option was set for a connected socket\n");
  677                                 error = EINVAL;
  678                                 goto release;
  679                         } else
  680                                 af = AF_INET;
  681                 }
  682                 laddr = &inp->in6p_laddr;
  683                 faddr = &inp->in6p_faddr;
  684                 fport = inp->inp_fport;
  685         }
  686 
  687         if (af == AF_INET)
  688                 hlen = sizeof(struct ip);
  689 
  690         /*
  691          * Calculate data length and get a mbuf
  692          * for UDP and IP6 headers.
  693          */
  694         M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT);
  695         if (m == 0) {
  696                 error = ENOBUFS;
  697                 goto release;
  698         }
  699 
  700         /*
  701          * Stuff checksum and output datagram.
  702          */
  703         udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
  704         udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */
  705         udp6->uh_dport = fport;
  706         if (plen <= 0xffff)
  707                 udp6->uh_ulen = htons((u_short)plen);
  708         else
  709                 udp6->uh_ulen = 0;
  710         udp6->uh_sum = 0;
  711 
  712         switch (af) {
  713         case AF_INET6:
  714                 ip6 = mtod(m, struct ip6_hdr *);
  715                 ip6->ip6_flow   = inp->inp_flow & IPV6_FLOWINFO_MASK;
  716                 ip6->ip6_vfc    &= ~IPV6_VERSION_MASK;
  717                 ip6->ip6_vfc    |= IPV6_VERSION;
  718 #if 0                           /* ip6_plen will be filled in ip6_output. */
  719                 ip6->ip6_plen   = htons((u_short)plen);
  720 #endif
  721                 ip6->ip6_nxt    = IPPROTO_UDP;
  722                 ip6->ip6_hlim   = in6_selecthlim(inp, NULL);
  723                 ip6->ip6_src    = *laddr;
  724                 ip6->ip6_dst    = *faddr;
  725 
  726                 if ((udp6->uh_sum = in6_cksum(m, IPPROTO_UDP,
  727                                 sizeof(struct ip6_hdr), plen)) == 0) {
  728                         udp6->uh_sum = 0xffff;
  729                 }
  730 
  731                 flags = 0;
  732 
  733                 UDPSTAT_INC(udps_opackets);
  734                 error = ip6_output(m, optp, NULL, flags, inp->in6p_moptions,
  735                     NULL, inp);
  736                 break;
  737         case AF_INET:
  738                 error = EAFNOSUPPORT;
  739                 goto release;
  740         }
  741         goto releaseopt;
  742 
  743 release:
  744         m_freem(m);
  745 
  746 releaseopt:
  747         if (control) {
  748                 ip6_clearpktopts(&opt, -1);
  749                 m_freem(control);
  750         }
  751         return (error);
  752 }
  753 
  754 static void
  755 udp6_abort(struct socket *so)
  756 {
  757         struct inpcb *inp;
  758 
  759         inp = sotoinpcb(so);
  760         KASSERT(inp != NULL, ("udp6_abort: inp == NULL"));
  761 
  762 #ifdef INET
  763         if (inp->inp_vflag & INP_IPV4) {
  764                 struct pr_usrreqs *pru;
  765 
  766                 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
  767                 (*pru->pru_abort)(so);
  768                 return;
  769         }
  770 #endif
  771 
  772         INP_INFO_WLOCK(&V_udbinfo);
  773         INP_WLOCK(inp);
  774         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
  775                 in6_pcbdisconnect(inp);
  776                 inp->in6p_laddr = in6addr_any;
  777                 soisdisconnected(so);
  778         }
  779         INP_WUNLOCK(inp);
  780         INP_INFO_WUNLOCK(&V_udbinfo);
  781 }
  782 
  783 static int
  784 udp6_attach(struct socket *so, int proto, struct thread *td)
  785 {
  786         struct inpcb *inp;
  787         int error;
  788 
  789         inp = sotoinpcb(so);
  790         KASSERT(inp == NULL, ("udp6_attach: inp != NULL"));
  791 
  792         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
  793                 error = soreserve(so, udp_sendspace, udp_recvspace);
  794                 if (error)
  795                         return (error);
  796         }
  797         INP_INFO_WLOCK(&V_udbinfo);
  798         error = in_pcballoc(so, &V_udbinfo);
  799         if (error) {
  800                 INP_INFO_WUNLOCK(&V_udbinfo);
  801                 return (error);
  802         }
  803         inp = (struct inpcb *)so->so_pcb;
  804         inp->inp_vflag |= INP_IPV6;
  805         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
  806                 inp->inp_vflag |= INP_IPV4;
  807         inp->in6p_hops = -1;    /* use kernel default */
  808         inp->in6p_cksum = -1;   /* just to be sure */
  809         /*
  810          * XXX: ugly!!
  811          * IPv4 TTL initialization is necessary for an IPv6 socket as well,
  812          * because the socket may be bound to an IPv6 wildcard address,
  813          * which may match an IPv4-mapped IPv6 address.
  814          */
  815         inp->inp_ip_ttl = V_ip_defttl;
  816 
  817         error = udp_newudpcb(inp);
  818         if (error) {
  819                 in_pcbdetach(inp);
  820                 in_pcbfree(inp);
  821                 INP_INFO_WUNLOCK(&V_udbinfo);
  822                 return (error);
  823         }
  824         INP_WUNLOCK(inp);
  825         INP_INFO_WUNLOCK(&V_udbinfo);
  826         return (0);
  827 }
  828 
  829 static int
  830 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
  831 {
  832         struct inpcb *inp;
  833         int error;
  834 
  835         inp = sotoinpcb(so);
  836         KASSERT(inp != NULL, ("udp6_bind: inp == NULL"));
  837 
  838         INP_INFO_WLOCK(&V_udbinfo);
  839         INP_WLOCK(inp);
  840         inp->inp_vflag &= ~INP_IPV4;
  841         inp->inp_vflag |= INP_IPV6;
  842         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
  843                 struct sockaddr_in6 *sin6_p;
  844 
  845                 sin6_p = (struct sockaddr_in6 *)nam;
  846 
  847                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
  848                         inp->inp_vflag |= INP_IPV4;
  849                 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
  850                         struct sockaddr_in sin;
  851 
  852                         in6_sin6_2_sin(&sin, sin6_p);
  853                         inp->inp_vflag |= INP_IPV4;
  854                         inp->inp_vflag &= ~INP_IPV6;
  855                         error = in_pcbbind(inp, (struct sockaddr *)&sin,
  856                             td->td_ucred);
  857                         goto out;
  858                 }
  859         }
  860 
  861         error = in6_pcbbind(inp, nam, td->td_ucred);
  862 out:
  863         INP_WUNLOCK(inp);
  864         INP_INFO_WUNLOCK(&V_udbinfo);
  865         return (error);
  866 }
  867 
  868 static void
  869 udp6_close(struct socket *so)
  870 {
  871         struct inpcb *inp;
  872 
  873         inp = sotoinpcb(so);
  874         KASSERT(inp != NULL, ("udp6_close: inp == NULL"));
  875 
  876 #ifdef INET
  877         if (inp->inp_vflag & INP_IPV4) {
  878                 struct pr_usrreqs *pru;
  879 
  880                 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
  881                 (*pru->pru_disconnect)(so);
  882                 return;
  883         }
  884 #endif
  885         INP_INFO_WLOCK(&V_udbinfo);
  886         INP_WLOCK(inp);
  887         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
  888                 in6_pcbdisconnect(inp);
  889                 inp->in6p_laddr = in6addr_any;
  890                 soisdisconnected(so);
  891         }
  892         INP_WUNLOCK(inp);
  893         INP_INFO_WUNLOCK(&V_udbinfo);
  894 }
  895 
  896 static int
  897 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
  898 {
  899         struct inpcb *inp;
  900         struct sockaddr_in6 *sin6;
  901         int error;
  902 
  903         inp = sotoinpcb(so);
  904         sin6 = (struct sockaddr_in6 *)nam;
  905         KASSERT(inp != NULL, ("udp6_connect: inp == NULL"));
  906 
  907         INP_INFO_WLOCK(&V_udbinfo);
  908         INP_WLOCK(inp);
  909         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
  910             IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
  911                 struct sockaddr_in sin;
  912 
  913                 if (inp->inp_faddr.s_addr != INADDR_ANY) {
  914                         error = EISCONN;
  915                         goto out;
  916                 }
  917                 in6_sin6_2_sin(&sin, sin6);
  918                 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr);
  919                 if (error != 0)
  920                         goto out;
  921                 error = in_pcbconnect(inp, (struct sockaddr *)&sin,
  922                     td->td_ucred);
  923                 if (error == 0) {
  924                         inp->inp_vflag |= INP_IPV4;
  925                         inp->inp_vflag &= ~INP_IPV6;
  926                         soisconnected(so);
  927                 }
  928                 goto out;
  929         }
  930         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
  931                 error = EISCONN;
  932                 goto out;
  933         }
  934         error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr);
  935         if (error != 0)
  936                 goto out;
  937         error = in6_pcbconnect(inp, nam, td->td_ucred);
  938         if (error == 0) {
  939                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
  940                         /* should be non mapped addr */
  941                         inp->inp_vflag &= ~INP_IPV4;
  942                         inp->inp_vflag |= INP_IPV6;
  943                 }
  944                 soisconnected(so);
  945         }
  946 out:
  947         INP_WUNLOCK(inp);
  948         INP_INFO_WUNLOCK(&V_udbinfo);
  949         return (error);
  950 }
  951 
  952 static void
  953 udp6_detach(struct socket *so)
  954 {
  955         struct inpcb *inp;
  956         struct udpcb *up;
  957 
  958         inp = sotoinpcb(so);
  959         KASSERT(inp != NULL, ("udp6_detach: inp == NULL"));
  960 
  961         INP_INFO_WLOCK(&V_udbinfo);
  962         INP_WLOCK(inp);
  963         up = intoudpcb(inp);
  964         KASSERT(up != NULL, ("%s: up == NULL", __func__));
  965         in_pcbdetach(inp);
  966         in_pcbfree(inp);
  967         INP_INFO_WUNLOCK(&V_udbinfo);
  968         udp_discardcb(up);
  969 }
  970 
  971 static int
  972 udp6_disconnect(struct socket *so)
  973 {
  974         struct inpcb *inp;
  975         int error;
  976 
  977         inp = sotoinpcb(so);
  978         KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL"));
  979 
  980         INP_INFO_WLOCK(&V_udbinfo);
  981         INP_WLOCK(inp);
  982 
  983 #ifdef INET
  984         if (inp->inp_vflag & INP_IPV4) {
  985                 struct pr_usrreqs *pru;
  986 
  987                 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
  988                 error = (*pru->pru_disconnect)(so);
  989                 goto out;
  990         }
  991 #endif
  992 
  993         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
  994                 error = ENOTCONN;
  995                 goto out;
  996         }
  997 
  998         in6_pcbdisconnect(inp);
  999         inp->in6p_laddr = in6addr_any;
 1000         SOCK_LOCK(so);
 1001         so->so_state &= ~SS_ISCONNECTED;                /* XXX */
 1002         SOCK_UNLOCK(so);
 1003 out:
 1004         INP_WUNLOCK(inp);
 1005         INP_INFO_WUNLOCK(&V_udbinfo);
 1006         return (0);
 1007 }
 1008 
 1009 static int
 1010 udp6_send(struct socket *so, int flags, struct mbuf *m,
 1011     struct sockaddr *addr, struct mbuf *control, struct thread *td)
 1012 {
 1013         struct inpcb *inp;
 1014         int error = 0;
 1015 
 1016         inp = sotoinpcb(so);
 1017         KASSERT(inp != NULL, ("udp6_send: inp == NULL"));
 1018 
 1019         INP_INFO_WLOCK(&V_udbinfo);
 1020         INP_WLOCK(inp);
 1021         if (addr) {
 1022                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 1023                         error = EINVAL;
 1024                         goto bad;
 1025                 }
 1026                 if (addr->sa_family != AF_INET6) {
 1027                         error = EAFNOSUPPORT;
 1028                         goto bad;
 1029                 }
 1030         }
 1031 
 1032 #ifdef INET
 1033         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
 1034                 int hasv4addr;
 1035                 struct sockaddr_in6 *sin6 = 0;
 1036 
 1037                 if (addr == 0)
 1038                         hasv4addr = (inp->inp_vflag & INP_IPV4);
 1039                 else {
 1040                         sin6 = (struct sockaddr_in6 *)addr;
 1041                         hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
 1042                             ? 1 : 0;
 1043                 }
 1044                 if (hasv4addr) {
 1045                         struct pr_usrreqs *pru;
 1046 
 1047                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
 1048                             !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) {
 1049                                 /*
 1050                                  * When remote addr is IPv4-mapped address,
 1051                                  * local addr should not be an IPv6 address;
 1052                                  * since you cannot determine how to map IPv6
 1053                                  * source address to IPv4.
 1054                                  */
 1055                                 error = EINVAL;
 1056                                 goto out;
 1057                         }
 1058 
 1059                         /*
 1060                          * XXXRW: We release UDP-layer locks before calling
 1061                          * udp_send() in order to avoid recursion.  However,
 1062                          * this does mean there is a short window where inp's
 1063                          * fields are unstable.  Could this lead to a
 1064                          * potential race in which the factors causing us to
 1065                          * select the UDPv4 output routine are invalidated?
 1066                          */
 1067                         INP_WUNLOCK(inp);
 1068                         INP_INFO_WUNLOCK(&V_udbinfo);
 1069                         if (sin6)
 1070                                 in6_sin6_2_sin_in_sock(addr);
 1071                         pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
 1072                         /* addr will just be freed in sendit(). */
 1073                         return ((*pru->pru_send)(so, flags, m, addr, control,
 1074                             td));
 1075                 }
 1076         }
 1077 #endif
 1078 #ifdef MAC
 1079         mac_inpcb_create_mbuf(inp, m);
 1080 #endif
 1081         error = udp6_output(inp, m, addr, control, td);
 1082 out:
 1083         INP_WUNLOCK(inp);
 1084         INP_INFO_WUNLOCK(&V_udbinfo);
 1085         return (error);
 1086 
 1087 bad:
 1088         INP_WUNLOCK(inp);
 1089         INP_INFO_WUNLOCK(&V_udbinfo);
 1090         m_freem(m);
 1091         return (error);
 1092 }
 1093 
 1094 struct pr_usrreqs udp6_usrreqs = {
 1095         .pru_abort =            udp6_abort,
 1096         .pru_attach =           udp6_attach,
 1097         .pru_bind =             udp6_bind,
 1098         .pru_connect =          udp6_connect,
 1099         .pru_control =          in6_control,
 1100         .pru_detach =           udp6_detach,
 1101         .pru_disconnect =       udp6_disconnect,
 1102         .pru_peeraddr =         in6_mapped_peeraddr,
 1103         .pru_send =             udp6_send,
 1104         .pru_shutdown =         udp_shutdown,
 1105         .pru_sockaddr =         in6_mapped_sockaddr,
 1106         .pru_soreceive =        soreceive_dgram,
 1107         .pru_sosend =           sosend_dgram,
 1108         .pru_sosetlabel =       in_pcbsosetlabel,
 1109         .pru_close =            udp6_close
 1110 };

Cache object: c978dc9d3436eefcbec1ba8c802e5d28


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