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/raw_ip6.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 
   30 /*-
   31  * Copyright (c) 1982, 1986, 1988, 1993
   32  *      The Regents of the University of California.
   33  * All rights reserved.
   34  *
   35  * Redistribution and use in source and binary forms, with or without
   36  * modification, are permitted provided that the following conditions
   37  * are met:
   38  * 1. Redistributions of source code must retain the above copyright
   39  *    notice, this list of conditions and the following disclaimer.
   40  * 2. Redistributions in binary form must reproduce the above copyright
   41  *    notice, this list of conditions and the following disclaimer in the
   42  *    documentation and/or other materials provided with the distribution.
   43  * 4. Neither the name of the University nor the names of its contributors
   44  *    may be used to endorse or promote products derived from this software
   45  *    without specific prior written permission.
   46  *
   47  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   48  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   49  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   50  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   51  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   52  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   53  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   54  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   55  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   56  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   57  * SUCH DAMAGE.
   58  *
   59  *      @(#)raw_ip.c    8.2 (Berkeley) 1/4/94
   60  */
   61 
   62 #include <sys/cdefs.h>
   63 __FBSDID("$FreeBSD: releng/9.2/sys/netinet6/raw_ip6.c 252692 2013-07-04 08:57:13Z ae $");
   64 
   65 #include "opt_ipsec.h"
   66 #include "opt_inet6.h"
   67 
   68 #include <sys/param.h>
   69 #include <sys/errno.h>
   70 #include <sys/jail.h>
   71 #include <sys/lock.h>
   72 #include <sys/malloc.h>
   73 #include <sys/mbuf.h>
   74 #include <sys/priv.h>
   75 #include <sys/proc.h>
   76 #include <sys/protosw.h>
   77 #include <sys/signalvar.h>
   78 #include <sys/socket.h>
   79 #include <sys/socketvar.h>
   80 #include <sys/sx.h>
   81 #include <sys/syslog.h>
   82 
   83 #include <net/if.h>
   84 #include <net/if_types.h>
   85 #include <net/route.h>
   86 #include <net/vnet.h>
   87 
   88 #include <netinet/in.h>
   89 #include <netinet/in_var.h>
   90 #include <netinet/in_systm.h>
   91 #include <netinet/in_pcb.h>
   92 
   93 #include <netinet/icmp6.h>
   94 #include <netinet/ip6.h>
   95 #include <netinet/ip_var.h>
   96 #include <netinet6/ip6protosw.h>
   97 #include <netinet6/ip6_mroute.h>
   98 #include <netinet6/in6_pcb.h>
   99 #include <netinet6/ip6_var.h>
  100 #include <netinet6/nd6.h>
  101 #include <netinet6/raw_ip6.h>
  102 #include <netinet6/scope6_var.h>
  103 #include <netinet6/send.h>
  104 
  105 #ifdef IPSEC
  106 #include <netipsec/ipsec.h>
  107 #include <netipsec/ipsec6.h>
  108 #endif /* IPSEC */
  109 
  110 #include <machine/stdarg.h>
  111 
  112 #define satosin6(sa)    ((struct sockaddr_in6 *)(sa))
  113 #define ifatoia6(ifa)   ((struct in6_ifaddr *)(ifa))
  114 
  115 /*
  116  * Raw interface to IP6 protocol.
  117  */
  118 
  119 VNET_DECLARE(struct inpcbhead, ripcb);
  120 VNET_DECLARE(struct inpcbinfo, ripcbinfo);
  121 #define V_ripcb                         VNET(ripcb)
  122 #define V_ripcbinfo                     VNET(ripcbinfo)
  123 
  124 extern u_long   rip_sendspace;
  125 extern u_long   rip_recvspace;
  126 
  127 VNET_DEFINE(struct rip6stat, rip6stat);
  128 
  129 /*
  130  * Hooks for multicast routing. They all default to NULL, so leave them not
  131  * initialized and rely on BSS being set to 0.
  132  */
  133 
  134 /*
  135  * The socket used to communicate with the multicast routing daemon.
  136  */
  137 VNET_DEFINE(struct socket *, ip6_mrouter);
  138 
  139 /*
  140  * The various mrouter functions.
  141  */
  142 int (*ip6_mrouter_set)(struct socket *, struct sockopt *);
  143 int (*ip6_mrouter_get)(struct socket *, struct sockopt *);
  144 int (*ip6_mrouter_done)(void);
  145 int (*ip6_mforward)(struct ip6_hdr *, struct ifnet *, struct mbuf *);
  146 int (*mrt6_ioctl)(u_long, caddr_t);
  147 
  148 /*
  149  * Setup generic address and protocol structures for raw_input routine, then
  150  * pass them along with mbuf chain.
  151  */
  152 int
  153 rip6_input(struct mbuf **mp, int *offp, int proto)
  154 {
  155         struct ifnet *ifp;
  156         struct mbuf *m = *mp;
  157         register struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
  158         register struct inpcb *in6p;
  159         struct inpcb *last = 0;
  160         struct mbuf *opts = NULL;
  161         struct sockaddr_in6 fromsa;
  162 
  163         RIP6STAT_INC(rip6s_ipackets);
  164 
  165         if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
  166                 /* XXX Send icmp6 host/port unreach? */
  167                 m_freem(m);
  168                 return (IPPROTO_DONE);
  169         }
  170 
  171         init_sin6(&fromsa, m); /* general init */
  172 
  173         ifp = m->m_pkthdr.rcvif;
  174 
  175         INP_INFO_RLOCK(&V_ripcbinfo);
  176         LIST_FOREACH(in6p, &V_ripcb, inp_list) {
  177                 /* XXX inp locking */
  178                 if ((in6p->inp_vflag & INP_IPV6) == 0)
  179                         continue;
  180                 if (in6p->inp_ip_p &&
  181                     in6p->inp_ip_p != proto)
  182                         continue;
  183                 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
  184                     !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
  185                         continue;
  186                 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
  187                     !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
  188                         continue;
  189                 if (jailed_without_vnet(in6p->inp_cred)) {
  190                         /*
  191                          * Allow raw socket in jail to receive multicast;
  192                          * assume process had PRIV_NETINET_RAW at attach,
  193                          * and fall through into normal filter path if so.
  194                          */
  195                         if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
  196                             prison_check_ip6(in6p->inp_cred,
  197                             &ip6->ip6_dst) != 0)
  198                                 continue;
  199                 }
  200                 INP_RLOCK(in6p);
  201                 if (in6p->in6p_cksum != -1) {
  202                         RIP6STAT_INC(rip6s_isum);
  203                         if (in6_cksum(m, proto, *offp,
  204                             m->m_pkthdr.len - *offp)) {
  205                                 INP_RUNLOCK(in6p);
  206                                 RIP6STAT_INC(rip6s_badsum);
  207                                 continue;
  208                         }
  209                 }
  210                 /*
  211                  * If this raw socket has multicast state, and we
  212                  * have received a multicast, check if this socket
  213                  * should receive it, as multicast filtering is now
  214                  * the responsibility of the transport layer.
  215                  */
  216                 if (in6p->in6p_moptions &&
  217                     IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
  218                         /*
  219                          * If the incoming datagram is for MLD, allow it
  220                          * through unconditionally to the raw socket.
  221                          *
  222                          * Use the M_RTALERT_MLD flag to check for MLD
  223                          * traffic without having to inspect the mbuf chain
  224                          * more deeply, as all MLDv1/v2 host messages MUST
  225                          * contain the Router Alert option.
  226                          *
  227                          * In the case of MLDv1, we may not have explicitly
  228                          * joined the group, and may have set IFF_ALLMULTI
  229                          * on the interface. im6o_mc_filter() may discard
  230                          * control traffic we actually need to see.
  231                          *
  232                          * Userland multicast routing daemons should continue
  233                          * filter the control traffic appropriately.
  234                          */
  235                         int blocked;
  236 
  237                         blocked = MCAST_PASS;
  238                         if ((m->m_flags & M_RTALERT_MLD) == 0) {
  239                                 struct sockaddr_in6 mcaddr;
  240 
  241                                 bzero(&mcaddr, sizeof(struct sockaddr_in6));
  242                                 mcaddr.sin6_len = sizeof(struct sockaddr_in6);
  243                                 mcaddr.sin6_family = AF_INET6;
  244                                 mcaddr.sin6_addr = ip6->ip6_dst;
  245 
  246                                 blocked = im6o_mc_filter(in6p->in6p_moptions,
  247                                     ifp,
  248                                     (struct sockaddr *)&mcaddr,
  249                                     (struct sockaddr *)&fromsa);
  250                         }
  251                         if (blocked != MCAST_PASS) {
  252                                 IP6STAT_INC(ip6s_notmember);
  253                                 INP_RUNLOCK(in6p);
  254                                 continue;
  255                         }
  256                 }
  257                 if (last != NULL) {
  258                         struct mbuf *n = m_copy(m, 0, (int)M_COPYALL);
  259 
  260 #ifdef IPSEC
  261                         /*
  262                          * Check AH/ESP integrity.
  263                          */
  264                         if (n && ipsec6_in_reject(n, last)) {
  265                                 m_freem(n);
  266                                 IPSEC6STAT_INC(in_polvio);
  267                                 /* Do not inject data into pcb. */
  268                         } else
  269 #endif /* IPSEC */
  270                         if (n) {
  271                                 if (last->inp_flags & INP_CONTROLOPTS ||
  272                                     last->inp_socket->so_options & SO_TIMESTAMP)
  273                                         ip6_savecontrol(last, n, &opts);
  274                                 /* strip intermediate headers */
  275                                 m_adj(n, *offp);
  276                                 if (sbappendaddr(&last->inp_socket->so_rcv,
  277                                                 (struct sockaddr *)&fromsa,
  278                                                  n, opts) == 0) {
  279                                         m_freem(n);
  280                                         if (opts)
  281                                                 m_freem(opts);
  282                                         RIP6STAT_INC(rip6s_fullsock);
  283                                 } else
  284                                         sorwakeup(last->inp_socket);
  285                                 opts = NULL;
  286                         }
  287                         INP_RUNLOCK(last);
  288                 }
  289                 last = in6p;
  290         }
  291         INP_INFO_RUNLOCK(&V_ripcbinfo);
  292 #ifdef IPSEC
  293         /*
  294          * Check AH/ESP integrity.
  295          */
  296         if ((last != NULL) && ipsec6_in_reject(m, last)) {
  297                 m_freem(m);
  298                 IPSEC6STAT_INC(in_polvio);
  299                 IP6STAT_DEC(ip6s_delivered);
  300                 /* Do not inject data into pcb. */
  301                 INP_RUNLOCK(last);
  302         } else
  303 #endif /* IPSEC */
  304         if (last != NULL) {
  305                 if (last->inp_flags & INP_CONTROLOPTS ||
  306                     last->inp_socket->so_options & SO_TIMESTAMP)
  307                         ip6_savecontrol(last, m, &opts);
  308                 /* Strip intermediate headers. */
  309                 m_adj(m, *offp);
  310                 if (sbappendaddr(&last->inp_socket->so_rcv,
  311                     (struct sockaddr *)&fromsa, m, opts) == 0) {
  312                         m_freem(m);
  313                         if (opts)
  314                                 m_freem(opts);
  315                         RIP6STAT_INC(rip6s_fullsock);
  316                 } else
  317                         sorwakeup(last->inp_socket);
  318                 INP_RUNLOCK(last);
  319         } else {
  320                 RIP6STAT_INC(rip6s_nosock);
  321                 if (m->m_flags & M_MCAST)
  322                         RIP6STAT_INC(rip6s_nosockmcast);
  323                 if (proto == IPPROTO_NONE)
  324                         m_freem(m);
  325                 else {
  326                         char *prvnxtp = ip6_get_prevhdr(m, *offp); /* XXX */
  327                         icmp6_error(m, ICMP6_PARAM_PROB,
  328                             ICMP6_PARAMPROB_NEXTHEADER,
  329                             prvnxtp - mtod(m, char *));
  330                 }
  331                 IP6STAT_DEC(ip6s_delivered);
  332         }
  333         return (IPPROTO_DONE);
  334 }
  335 
  336 void
  337 rip6_ctlinput(int cmd, struct sockaddr *sa, void *d)
  338 {
  339         struct ip6_hdr *ip6;
  340         struct mbuf *m;
  341         int off = 0;
  342         struct ip6ctlparam *ip6cp = NULL;
  343         const struct sockaddr_in6 *sa6_src = NULL;
  344         void *cmdarg;
  345         struct inpcb *(*notify)(struct inpcb *, int) = in6_rtchange;
  346 
  347         if (sa->sa_family != AF_INET6 ||
  348             sa->sa_len != sizeof(struct sockaddr_in6))
  349                 return;
  350 
  351         if ((unsigned)cmd >= PRC_NCMDS)
  352                 return;
  353         if (PRC_IS_REDIRECT(cmd))
  354                 notify = in6_rtchange, d = NULL;
  355         else if (cmd == PRC_HOSTDEAD)
  356                 d = NULL;
  357         else if (inet6ctlerrmap[cmd] == 0)
  358                 return;
  359 
  360         /*
  361          * If the parameter is from icmp6, decode it.
  362          */
  363         if (d != NULL) {
  364                 ip6cp = (struct ip6ctlparam *)d;
  365                 m = ip6cp->ip6c_m;
  366                 ip6 = ip6cp->ip6c_ip6;
  367                 off = ip6cp->ip6c_off;
  368                 cmdarg = ip6cp->ip6c_cmdarg;
  369                 sa6_src = ip6cp->ip6c_src;
  370         } else {
  371                 m = NULL;
  372                 ip6 = NULL;
  373                 cmdarg = NULL;
  374                 sa6_src = &sa6_any;
  375         }
  376 
  377         (void) in6_pcbnotify(&V_ripcbinfo, sa, 0,
  378             (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
  379 }
  380 
  381 /*
  382  * Generate IPv6 header and pass packet to ip6_output.  Tack on options user
  383  * may have setup with control call.
  384  */
  385 int
  386 #if __STDC__
  387 rip6_output(struct mbuf *m, ...)
  388 #else
  389 rip6_output(m, va_alist)
  390         struct mbuf *m;
  391         va_dcl
  392 #endif
  393 {
  394         struct mbuf *control;
  395         struct m_tag *mtag;
  396         struct socket *so;
  397         struct sockaddr_in6 *dstsock;
  398         struct in6_addr *dst;
  399         struct ip6_hdr *ip6;
  400         struct inpcb *in6p;
  401         u_int   plen = m->m_pkthdr.len;
  402         int error = 0;
  403         struct ip6_pktopts opt, *optp;
  404         struct ifnet *oifp = NULL;
  405         int type = 0, code = 0;         /* for ICMPv6 output statistics only */
  406         int scope_ambiguous = 0;
  407         int use_defzone = 0;
  408         struct in6_addr in6a;
  409         va_list ap;
  410 
  411         va_start(ap, m);
  412         so = va_arg(ap, struct socket *);
  413         dstsock = va_arg(ap, struct sockaddr_in6 *);
  414         control = va_arg(ap, struct mbuf *);
  415         va_end(ap);
  416 
  417         in6p = sotoinpcb(so);
  418         INP_WLOCK(in6p);
  419 
  420         dst = &dstsock->sin6_addr;
  421         if (control != NULL) {
  422                 if ((error = ip6_setpktopts(control, &opt,
  423                     in6p->in6p_outputopts, so->so_cred,
  424                     so->so_proto->pr_protocol)) != 0) {
  425                         goto bad;
  426                 }
  427                 optp = &opt;
  428         } else
  429                 optp = in6p->in6p_outputopts;
  430 
  431         /*
  432          * Check and convert scope zone ID into internal form.
  433          *
  434          * XXX: we may still need to determine the zone later.
  435          */
  436         if (!(so->so_state & SS_ISCONNECTED)) {
  437                 if (!optp || !optp->ip6po_pktinfo ||
  438                     !optp->ip6po_pktinfo->ipi6_ifindex)
  439                         use_defzone = V_ip6_use_defzone;
  440                 if (dstsock->sin6_scope_id == 0 && !use_defzone)
  441                         scope_ambiguous = 1;
  442                 if ((error = sa6_embedscope(dstsock, use_defzone)) != 0)
  443                         goto bad;
  444         }
  445 
  446         /*
  447          * For an ICMPv6 packet, we should know its type and code to update
  448          * statistics.
  449          */
  450         if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
  451                 struct icmp6_hdr *icmp6;
  452                 if (m->m_len < sizeof(struct icmp6_hdr) &&
  453                     (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) {
  454                         error = ENOBUFS;
  455                         goto bad;
  456                 }
  457                 icmp6 = mtod(m, struct icmp6_hdr *);
  458                 type = icmp6->icmp6_type;
  459                 code = icmp6->icmp6_code;
  460         }
  461 
  462         M_PREPEND(m, sizeof(*ip6), M_DONTWAIT);
  463         if (m == NULL) {
  464                 error = ENOBUFS;
  465                 goto bad;
  466         }
  467         ip6 = mtod(m, struct ip6_hdr *);
  468 
  469         /*
  470          * Source address selection.
  471          */
  472         error = in6_selectsrc(dstsock, optp, in6p, NULL, so->so_cred,
  473             &oifp, &in6a);
  474         if (error)
  475                 goto bad;
  476         error = prison_check_ip6(in6p->inp_cred, &in6a);
  477         if (error != 0)
  478                 goto bad;
  479         ip6->ip6_src = in6a;
  480 
  481         if (oifp && scope_ambiguous) {
  482                 /*
  483                  * Application should provide a proper zone ID or the use of
  484                  * default zone IDs should be enabled.  Unfortunately, some
  485                  * applications do not behave as it should, so we need a
  486                  * workaround.  Even if an appropriate ID is not determined
  487                  * (when it's required), if we can determine the outgoing
  488                  * interface. determine the zone ID based on the interface.
  489                  */
  490                 error = in6_setscope(&dstsock->sin6_addr, oifp, NULL);
  491                 if (error != 0)
  492                         goto bad;
  493         }
  494         ip6->ip6_dst = dstsock->sin6_addr;
  495 
  496         /*
  497          * Fill in the rest of the IPv6 header fields.
  498          */
  499         ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) |
  500             (in6p->inp_flow & IPV6_FLOWINFO_MASK);
  501         ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) |
  502             (IPV6_VERSION & IPV6_VERSION_MASK);
  503 
  504         /*
  505          * ip6_plen will be filled in ip6_output, so not fill it here.
  506          */
  507         ip6->ip6_nxt = in6p->inp_ip_p;
  508         ip6->ip6_hlim = in6_selecthlim(in6p, oifp);
  509 
  510         if (so->so_proto->pr_protocol == IPPROTO_ICMPV6 ||
  511             in6p->in6p_cksum != -1) {
  512                 struct mbuf *n;
  513                 int off;
  514                 u_int16_t *p;
  515 
  516                 /* Compute checksum. */
  517                 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
  518                         off = offsetof(struct icmp6_hdr, icmp6_cksum);
  519                 else
  520                         off = in6p->in6p_cksum;
  521                 if (plen < off + 1) {
  522                         error = EINVAL;
  523                         goto bad;
  524                 }
  525                 off += sizeof(struct ip6_hdr);
  526 
  527                 n = m;
  528                 while (n && n->m_len <= off) {
  529                         off -= n->m_len;
  530                         n = n->m_next;
  531                 }
  532                 if (!n)
  533                         goto bad;
  534                 p = (u_int16_t *)(mtod(n, caddr_t) + off);
  535                 *p = 0;
  536                 *p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen);
  537         }
  538 
  539         /*
  540          * Send RA/RS messages to user land for protection, before sending
  541          * them to rtadvd/rtsol.
  542          */
  543         if ((send_sendso_input_hook != NULL) &&
  544             so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
  545                 switch (type) {
  546                 case ND_ROUTER_ADVERT:
  547                 case ND_ROUTER_SOLICIT:
  548                         mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
  549                                 sizeof(unsigned short), M_NOWAIT);
  550                         if (mtag == NULL)
  551                                 goto bad;
  552                         m_tag_prepend(m, mtag);
  553                 }
  554         }
  555 
  556         error = ip6_output(m, optp, NULL, 0, in6p->in6p_moptions, &oifp, in6p);
  557         if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
  558                 if (oifp)
  559                         icmp6_ifoutstat_inc(oifp, type, code);
  560                 ICMP6STAT_INC(icp6s_outhist[type]);
  561         } else
  562                 RIP6STAT_INC(rip6s_opackets);
  563 
  564         goto freectl;
  565 
  566  bad:
  567         if (m)
  568                 m_freem(m);
  569 
  570  freectl:
  571         if (control != NULL) {
  572                 ip6_clearpktopts(&opt, -1);
  573                 m_freem(control);
  574         }
  575         INP_WUNLOCK(in6p);
  576         return (error);
  577 }
  578 
  579 /*
  580  * Raw IPv6 socket option processing.
  581  */
  582 int
  583 rip6_ctloutput(struct socket *so, struct sockopt *sopt)
  584 {
  585         struct inpcb *inp;
  586         int error;
  587 
  588         if (sopt->sopt_level == IPPROTO_ICMPV6)
  589                 /*
  590                  * XXX: is it better to call icmp6_ctloutput() directly
  591                  * from protosw?
  592                  */
  593                 return (icmp6_ctloutput(so, sopt));
  594         else if (sopt->sopt_level != IPPROTO_IPV6) {
  595                 if (sopt->sopt_level == SOL_SOCKET &&
  596                     sopt->sopt_name == SO_SETFIB) {
  597                         inp = sotoinpcb(so);
  598                         INP_WLOCK(inp);
  599                         inp->inp_inc.inc_fibnum = so->so_fibnum;
  600                         INP_WUNLOCK(inp);
  601                         return (0);
  602                 }
  603                 return (EINVAL);
  604         }
  605 
  606         error = 0;
  607 
  608         switch (sopt->sopt_dir) {
  609         case SOPT_GET:
  610                 switch (sopt->sopt_name) {
  611                 case MRT6_INIT:
  612                 case MRT6_DONE:
  613                 case MRT6_ADD_MIF:
  614                 case MRT6_DEL_MIF:
  615                 case MRT6_ADD_MFC:
  616                 case MRT6_DEL_MFC:
  617                 case MRT6_PIM:
  618                         error = ip6_mrouter_get ?  ip6_mrouter_get(so, sopt) :
  619                             EOPNOTSUPP;
  620                         break;
  621                 case IPV6_CHECKSUM:
  622                         error = ip6_raw_ctloutput(so, sopt);
  623                         break;
  624                 default:
  625                         error = ip6_ctloutput(so, sopt);
  626                         break;
  627                 }
  628                 break;
  629 
  630         case SOPT_SET:
  631                 switch (sopt->sopt_name) {
  632                 case MRT6_INIT:
  633                 case MRT6_DONE:
  634                 case MRT6_ADD_MIF:
  635                 case MRT6_DEL_MIF:
  636                 case MRT6_ADD_MFC:
  637                 case MRT6_DEL_MFC:
  638                 case MRT6_PIM:
  639                         error = ip6_mrouter_set ?  ip6_mrouter_set(so, sopt) :
  640                             EOPNOTSUPP;
  641                         break;
  642                 case IPV6_CHECKSUM:
  643                         error = ip6_raw_ctloutput(so, sopt);
  644                         break;
  645                 default:
  646                         error = ip6_ctloutput(so, sopt);
  647                         break;
  648                 }
  649                 break;
  650         }
  651 
  652         return (error);
  653 }
  654 
  655 static int
  656 rip6_attach(struct socket *so, int proto, struct thread *td)
  657 {
  658         struct inpcb *inp;
  659         struct icmp6_filter *filter;
  660         int error;
  661 
  662         inp = sotoinpcb(so);
  663         KASSERT(inp == NULL, ("rip6_attach: inp != NULL"));
  664 
  665         error = priv_check(td, PRIV_NETINET_RAW);
  666         if (error)
  667                 return (error);
  668         error = soreserve(so, rip_sendspace, rip_recvspace);
  669         if (error)
  670                 return (error);
  671         filter = malloc(sizeof(struct icmp6_filter), M_PCB, M_NOWAIT);
  672         if (filter == NULL)
  673                 return (ENOMEM);
  674         INP_INFO_WLOCK(&V_ripcbinfo);
  675         error = in_pcballoc(so, &V_ripcbinfo);
  676         if (error) {
  677                 INP_INFO_WUNLOCK(&V_ripcbinfo);
  678                 free(filter, M_PCB);
  679                 return (error);
  680         }
  681         inp = (struct inpcb *)so->so_pcb;
  682         INP_INFO_WUNLOCK(&V_ripcbinfo);
  683         inp->inp_vflag |= INP_IPV6;
  684         inp->inp_ip_p = (long)proto;
  685         inp->in6p_hops = -1;    /* use kernel default */
  686         inp->in6p_cksum = -1;
  687         inp->in6p_icmp6filt = filter;
  688         ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt);
  689         INP_WUNLOCK(inp);
  690         return (0);
  691 }
  692 
  693 static void
  694 rip6_detach(struct socket *so)
  695 {
  696         struct inpcb *inp;
  697 
  698         inp = sotoinpcb(so);
  699         KASSERT(inp != NULL, ("rip6_detach: inp == NULL"));
  700 
  701         if (so == V_ip6_mrouter && ip6_mrouter_done)
  702                 ip6_mrouter_done();
  703         /* xxx: RSVP */
  704         INP_INFO_WLOCK(&V_ripcbinfo);
  705         INP_WLOCK(inp);
  706         free(inp->in6p_icmp6filt, M_PCB);
  707         in_pcbdetach(inp);
  708         in_pcbfree(inp);
  709         INP_INFO_WUNLOCK(&V_ripcbinfo);
  710 }
  711 
  712 /* XXXRW: This can't ever be called. */
  713 static void
  714 rip6_abort(struct socket *so)
  715 {
  716         struct inpcb *inp;
  717 
  718         inp = sotoinpcb(so);
  719         KASSERT(inp != NULL, ("rip6_abort: inp == NULL"));
  720 
  721         soisdisconnected(so);
  722 }
  723 
  724 static void
  725 rip6_close(struct socket *so)
  726 {
  727         struct inpcb *inp;
  728 
  729         inp = sotoinpcb(so);
  730         KASSERT(inp != NULL, ("rip6_close: inp == NULL"));
  731 
  732         soisdisconnected(so);
  733 }
  734 
  735 static int
  736 rip6_disconnect(struct socket *so)
  737 {
  738         struct inpcb *inp;
  739 
  740         inp = sotoinpcb(so);
  741         KASSERT(inp != NULL, ("rip6_disconnect: inp == NULL"));
  742 
  743         if ((so->so_state & SS_ISCONNECTED) == 0)
  744                 return (ENOTCONN);
  745         inp->in6p_faddr = in6addr_any;
  746         rip6_abort(so);
  747         return (0);
  748 }
  749 
  750 static int
  751 rip6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
  752 {
  753         struct inpcb *inp;
  754         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
  755         struct ifaddr *ifa = NULL;
  756         int error = 0;
  757 
  758         inp = sotoinpcb(so);
  759         KASSERT(inp != NULL, ("rip6_bind: inp == NULL"));
  760 
  761         if (nam->sa_len != sizeof(*addr))
  762                 return (EINVAL);
  763         if ((error = prison_check_ip6(td->td_ucred, &addr->sin6_addr)) != 0)
  764                 return (error);
  765         if (TAILQ_EMPTY(&V_ifnet) || addr->sin6_family != AF_INET6)
  766                 return (EADDRNOTAVAIL);
  767         if ((error = sa6_embedscope(addr, V_ip6_use_defzone)) != 0)
  768                 return (error);
  769 
  770         if (!IN6_IS_ADDR_UNSPECIFIED(&addr->sin6_addr) &&
  771             (ifa = ifa_ifwithaddr((struct sockaddr *)addr)) == NULL)
  772                 return (EADDRNOTAVAIL);
  773         if (ifa != NULL &&
  774             ((struct in6_ifaddr *)ifa)->ia6_flags &
  775             (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|
  776              IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) {
  777                 ifa_free(ifa);
  778                 return (EADDRNOTAVAIL);
  779         }
  780         if (ifa != NULL)
  781                 ifa_free(ifa);
  782         INP_INFO_WLOCK(&V_ripcbinfo);
  783         INP_WLOCK(inp);
  784         inp->in6p_laddr = addr->sin6_addr;
  785         INP_WUNLOCK(inp);
  786         INP_INFO_WUNLOCK(&V_ripcbinfo);
  787         return (0);
  788 }
  789 
  790 static int
  791 rip6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
  792 {
  793         struct inpcb *inp;
  794         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
  795         struct in6_addr in6a;
  796         struct ifnet *ifp = NULL;
  797         int error = 0, scope_ambiguous = 0;
  798 
  799         inp = sotoinpcb(so);
  800         KASSERT(inp != NULL, ("rip6_connect: inp == NULL"));
  801 
  802         if (nam->sa_len != sizeof(*addr))
  803                 return (EINVAL);
  804         if (TAILQ_EMPTY(&V_ifnet))
  805                 return (EADDRNOTAVAIL);
  806         if (addr->sin6_family != AF_INET6)
  807                 return (EAFNOSUPPORT);
  808 
  809         /*
  810          * Application should provide a proper zone ID or the use of default
  811          * zone IDs should be enabled.  Unfortunately, some applications do
  812          * not behave as it should, so we need a workaround.  Even if an
  813          * appropriate ID is not determined, we'll see if we can determine
  814          * the outgoing interface.  If we can, determine the zone ID based on
  815          * the interface below.
  816          */
  817         if (addr->sin6_scope_id == 0 && !V_ip6_use_defzone)
  818                 scope_ambiguous = 1;
  819         if ((error = sa6_embedscope(addr, V_ip6_use_defzone)) != 0)
  820                 return (error);
  821 
  822         INP_INFO_WLOCK(&V_ripcbinfo);
  823         INP_WLOCK(inp);
  824         /* Source address selection. XXX: need pcblookup? */
  825         error = in6_selectsrc(addr, inp->in6p_outputopts,
  826             inp, NULL, so->so_cred, &ifp, &in6a);
  827         if (error) {
  828                 INP_WUNLOCK(inp);
  829                 INP_INFO_WUNLOCK(&V_ripcbinfo);
  830                 return (error);
  831         }
  832 
  833         /* XXX: see above */
  834         if (ifp && scope_ambiguous &&
  835             (error = in6_setscope(&addr->sin6_addr, ifp, NULL)) != 0) {
  836                 INP_WUNLOCK(inp);
  837                 INP_INFO_WUNLOCK(&V_ripcbinfo);
  838                 return (error);
  839         }
  840         inp->in6p_faddr = addr->sin6_addr;
  841         inp->in6p_laddr = in6a;
  842         soisconnected(so);
  843         INP_WUNLOCK(inp);
  844         INP_INFO_WUNLOCK(&V_ripcbinfo);
  845         return (0);
  846 }
  847 
  848 static int
  849 rip6_shutdown(struct socket *so)
  850 {
  851         struct inpcb *inp;
  852 
  853         inp = sotoinpcb(so);
  854         KASSERT(inp != NULL, ("rip6_shutdown: inp == NULL"));
  855 
  856         INP_WLOCK(inp);
  857         socantsendmore(so);
  858         INP_WUNLOCK(inp);
  859         return (0);
  860 }
  861 
  862 static int
  863 rip6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
  864     struct mbuf *control, struct thread *td)
  865 {
  866         struct inpcb *inp;
  867         struct sockaddr_in6 tmp;
  868         struct sockaddr_in6 *dst;
  869         int ret;
  870 
  871         inp = sotoinpcb(so);
  872         KASSERT(inp != NULL, ("rip6_send: inp == NULL"));
  873 
  874         /* Always copy sockaddr to avoid overwrites. */
  875         /* Unlocked read. */
  876         if (so->so_state & SS_ISCONNECTED) {
  877                 if (nam) {
  878                         m_freem(m);
  879                         return (EISCONN);
  880                 }
  881                 /* XXX */
  882                 bzero(&tmp, sizeof(tmp));
  883                 tmp.sin6_family = AF_INET6;
  884                 tmp.sin6_len = sizeof(struct sockaddr_in6);
  885                 INP_RLOCK(inp);
  886                 bcopy(&inp->in6p_faddr, &tmp.sin6_addr,
  887                     sizeof(struct in6_addr));
  888                 INP_RUNLOCK(inp);
  889                 dst = &tmp;
  890         } else {
  891                 if (nam == NULL) {
  892                         m_freem(m);
  893                         return (ENOTCONN);
  894                 }
  895                 if (nam->sa_len != sizeof(struct sockaddr_in6)) {
  896                         m_freem(m);
  897                         return (EINVAL);
  898                 }
  899                 tmp = *(struct sockaddr_in6 *)nam;
  900                 dst = &tmp;
  901 
  902                 if (dst->sin6_family == AF_UNSPEC) {
  903                         /*
  904                          * XXX: we allow this case for backward
  905                          * compatibility to buggy applications that
  906                          * rely on old (and wrong) kernel behavior.
  907                          */
  908                         log(LOG_INFO, "rip6 SEND: address family is "
  909                             "unspec. Assume AF_INET6\n");
  910                         dst->sin6_family = AF_INET6;
  911                 } else if (dst->sin6_family != AF_INET6) {
  912                         m_freem(m);
  913                         return(EAFNOSUPPORT);
  914                 }
  915         }
  916         ret = rip6_output(m, so, dst, control);
  917         return (ret);
  918 }
  919 
  920 struct pr_usrreqs rip6_usrreqs = {
  921         .pru_abort =            rip6_abort,
  922         .pru_attach =           rip6_attach,
  923         .pru_bind =             rip6_bind,
  924         .pru_connect =          rip6_connect,
  925         .pru_control =          in6_control,
  926         .pru_detach =           rip6_detach,
  927         .pru_disconnect =       rip6_disconnect,
  928         .pru_peeraddr =         in6_getpeeraddr,
  929         .pru_send =             rip6_send,
  930         .pru_shutdown =         rip6_shutdown,
  931         .pru_sockaddr =         in6_getsockaddr,
  932         .pru_close =            rip6_close,
  933 };

Cache object: 5a4226246e17ff9dd36dfe011db78f55


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