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/8.1/sys/netinet6/raw_ip6.c 207695 2010-05-06 06:44:19Z bz $");
   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 <netinet6/ip6protosw.h>
   96 #include <netinet6/ip6_mroute.h>
   97 #include <netinet6/in6_pcb.h>
   98 #include <netinet6/ip6_var.h>
   99 #include <netinet6/nd6.h>
  100 #include <netinet6/raw_ip6.h>
  101 #include <netinet6/scope6_var.h>
  102 
  103 #ifdef IPSEC
  104 #include <netipsec/ipsec.h>
  105 #include <netipsec/ipsec6.h>
  106 #endif /* IPSEC */
  107 
  108 #include <machine/stdarg.h>
  109 
  110 #define satosin6(sa)    ((struct sockaddr_in6 *)(sa))
  111 #define ifatoia6(ifa)   ((struct in6_ifaddr *)(ifa))
  112 
  113 /*
  114  * Raw interface to IP6 protocol.
  115  */
  116 
  117 VNET_DECLARE(struct inpcbhead, ripcb);
  118 VNET_DECLARE(struct inpcbinfo, ripcbinfo);
  119 #define V_ripcb                         VNET(ripcb)
  120 #define V_ripcbinfo                     VNET(ripcbinfo)
  121 
  122 extern u_long   rip_sendspace;
  123 extern u_long   rip_recvspace;
  124 
  125 VNET_DEFINE(struct rip6stat, rip6stat);
  126 
  127 /*
  128  * Hooks for multicast routing. They all default to NULL, so leave them not
  129  * initialized and rely on BSS being set to 0.
  130  */
  131 
  132 /*
  133  * The socket used to communicate with the multicast routing daemon.
  134  */
  135 VNET_DEFINE(struct socket *, ip6_mrouter);
  136 
  137 /*
  138  * The various mrouter functions.
  139  */
  140 int (*ip6_mrouter_set)(struct socket *, struct sockopt *);
  141 int (*ip6_mrouter_get)(struct socket *, struct sockopt *);
  142 int (*ip6_mrouter_done)(void);
  143 int (*ip6_mforward)(struct ip6_hdr *, struct ifnet *, struct mbuf *);
  144 int (*mrt6_ioctl)(u_long, caddr_t);
  145 
  146 /*
  147  * Setup generic address and protocol structures for raw_input routine, then
  148  * pass them along with mbuf chain.
  149  */
  150 int
  151 rip6_input(struct mbuf **mp, int *offp, int proto)
  152 {
  153         struct ifnet *ifp;
  154         struct mbuf *m = *mp;
  155         register struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
  156         register struct inpcb *in6p;
  157         struct inpcb *last = 0;
  158         struct mbuf *opts = NULL;
  159         struct sockaddr_in6 fromsa;
  160 
  161         V_rip6stat.rip6s_ipackets++;
  162 
  163         if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
  164                 /* XXX Send icmp6 host/port unreach? */
  165                 m_freem(m);
  166                 return (IPPROTO_DONE);
  167         }
  168 
  169         init_sin6(&fromsa, m); /* general init */
  170 
  171         ifp = m->m_pkthdr.rcvif;
  172 
  173         INP_INFO_RLOCK(&V_ripcbinfo);
  174         LIST_FOREACH(in6p, &V_ripcb, inp_list) {
  175                 /* XXX inp locking */
  176                 if ((in6p->inp_vflag & INP_IPV6) == 0)
  177                         continue;
  178                 if (in6p->inp_ip_p &&
  179                     in6p->inp_ip_p != proto)
  180                         continue;
  181                 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
  182                     !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
  183                         continue;
  184                 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
  185                     !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
  186                         continue;
  187                 if (jailed_without_vnet(in6p->inp_cred)) {
  188                         /*
  189                          * Allow raw socket in jail to receive multicast;
  190                          * assume process had PRIV_NETINET_RAW at attach,
  191                          * and fall through into normal filter path if so.
  192                          */
  193                         if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
  194                             prison_check_ip6(in6p->inp_cred,
  195                             &ip6->ip6_dst) != 0)
  196                                 continue;
  197                 }
  198                 if (in6p->in6p_cksum != -1) {
  199                         V_rip6stat.rip6s_isum++;
  200                         if (in6_cksum(m, proto, *offp,
  201                             m->m_pkthdr.len - *offp)) {
  202                                 INP_RUNLOCK(in6p);
  203                                 V_rip6stat.rip6s_badsum++;
  204                                 continue;
  205                         }
  206                 }
  207                 INP_RLOCK(in6p);
  208                 /*
  209                  * If this raw socket has multicast state, and we
  210                  * have received a multicast, check if this socket
  211                  * should receive it, as multicast filtering is now
  212                  * the responsibility of the transport layer.
  213                  */
  214                 if (in6p->in6p_moptions &&
  215                     IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
  216                         /*
  217                          * If the incoming datagram is for MLD, allow it
  218                          * through unconditionally to the raw socket.
  219                          *
  220                          * Use the M_RTALERT_MLD flag to check for MLD
  221                          * traffic without having to inspect the mbuf chain
  222                          * more deeply, as all MLDv1/v2 host messages MUST
  223                          * contain the Router Alert option.
  224                          *
  225                          * In the case of MLDv1, we may not have explicitly
  226                          * joined the group, and may have set IFF_ALLMULTI
  227                          * on the interface. im6o_mc_filter() may discard
  228                          * control traffic we actually need to see.
  229                          *
  230                          * Userland multicast routing daemons should continue
  231                          * filter the control traffic appropriately.
  232                          */
  233                         int blocked;
  234 
  235                         blocked = MCAST_PASS;
  236                         if ((m->m_flags & M_RTALERT_MLD) == 0) {
  237                                 struct sockaddr_in6 mcaddr;
  238 
  239                                 bzero(&mcaddr, sizeof(struct sockaddr_in6));
  240                                 mcaddr.sin6_len = sizeof(struct sockaddr_in6);
  241                                 mcaddr.sin6_family = AF_INET6;
  242                                 mcaddr.sin6_addr = ip6->ip6_dst;
  243 
  244                                 blocked = im6o_mc_filter(in6p->in6p_moptions,
  245                                     ifp,
  246                                     (struct sockaddr *)&mcaddr,
  247                                     (struct sockaddr *)&fromsa);
  248                         }
  249                         if (blocked != MCAST_PASS) {
  250                                 IP6STAT_INC(ip6s_notmember);
  251                                 continue;
  252                         }
  253                 }
  254                 if (last != NULL) {
  255                         struct mbuf *n = m_copy(m, 0, (int)M_COPYALL);
  256 
  257 #ifdef IPSEC
  258                         /*
  259                          * Check AH/ESP integrity.
  260                          */
  261                         if (n && ipsec6_in_reject(n, last)) {
  262                                 m_freem(n);
  263                                 V_ipsec6stat.in_polvio++;
  264                                 /* Do not inject data into pcb. */
  265                         } else
  266 #endif /* IPSEC */
  267                         if (n) {
  268                                 if (last->inp_flags & INP_CONTROLOPTS ||
  269                                     last->inp_socket->so_options & SO_TIMESTAMP)
  270                                         ip6_savecontrol(last, n, &opts);
  271                                 /* strip intermediate headers */
  272                                 m_adj(n, *offp);
  273                                 if (sbappendaddr(&last->inp_socket->so_rcv,
  274                                                 (struct sockaddr *)&fromsa,
  275                                                  n, opts) == 0) {
  276                                         m_freem(n);
  277                                         if (opts)
  278                                                 m_freem(opts);
  279                                         V_rip6stat.rip6s_fullsock++;
  280                                 } else
  281                                         sorwakeup(last->inp_socket);
  282                                 opts = NULL;
  283                         }
  284                         INP_RUNLOCK(last);
  285                 }
  286                 last = in6p;
  287         }
  288         INP_INFO_RUNLOCK(&V_ripcbinfo);
  289 #ifdef IPSEC
  290         /*
  291          * Check AH/ESP integrity.
  292          */
  293         if ((last != NULL) && ipsec6_in_reject(m, last)) {
  294                 m_freem(m);
  295                 V_ipsec6stat.in_polvio++;
  296                 V_ip6stat.ip6s_delivered--;
  297                 /* Do not inject data into pcb. */
  298                 INP_RUNLOCK(last);
  299         } else
  300 #endif /* IPSEC */
  301         if (last != NULL) {
  302                 if (last->inp_flags & INP_CONTROLOPTS ||
  303                     last->inp_socket->so_options & SO_TIMESTAMP)
  304                         ip6_savecontrol(last, m, &opts);
  305                 /* Strip intermediate headers. */
  306                 m_adj(m, *offp);
  307                 if (sbappendaddr(&last->inp_socket->so_rcv,
  308                     (struct sockaddr *)&fromsa, m, opts) == 0) {
  309                         m_freem(m);
  310                         if (opts)
  311                                 m_freem(opts);
  312                         V_rip6stat.rip6s_fullsock++;
  313                 } else
  314                         sorwakeup(last->inp_socket);
  315                 INP_RUNLOCK(last);
  316         } else {
  317                 V_rip6stat.rip6s_nosock++;
  318                 if (m->m_flags & M_MCAST)
  319                         V_rip6stat.rip6s_nosockmcast++;
  320                 if (proto == IPPROTO_NONE)
  321                         m_freem(m);
  322                 else {
  323                         char *prvnxtp = ip6_get_prevhdr(m, *offp); /* XXX */
  324                         icmp6_error(m, ICMP6_PARAM_PROB,
  325                             ICMP6_PARAMPROB_NEXTHEADER,
  326                             prvnxtp - mtod(m, char *));
  327                 }
  328                 V_ip6stat.ip6s_delivered--;
  329         }
  330         return (IPPROTO_DONE);
  331 }
  332 
  333 void
  334 rip6_ctlinput(int cmd, struct sockaddr *sa, void *d)
  335 {
  336         struct ip6_hdr *ip6;
  337         struct mbuf *m;
  338         int off = 0;
  339         struct ip6ctlparam *ip6cp = NULL;
  340         const struct sockaddr_in6 *sa6_src = NULL;
  341         void *cmdarg;
  342         struct inpcb *(*notify)(struct inpcb *, int) = in6_rtchange;
  343 
  344         if (sa->sa_family != AF_INET6 ||
  345             sa->sa_len != sizeof(struct sockaddr_in6))
  346                 return;
  347 
  348         if ((unsigned)cmd >= PRC_NCMDS)
  349                 return;
  350         if (PRC_IS_REDIRECT(cmd))
  351                 notify = in6_rtchange, d = NULL;
  352         else if (cmd == PRC_HOSTDEAD)
  353                 d = NULL;
  354         else if (inet6ctlerrmap[cmd] == 0)
  355                 return;
  356 
  357         /*
  358          * If the parameter is from icmp6, decode it.
  359          */
  360         if (d != NULL) {
  361                 ip6cp = (struct ip6ctlparam *)d;
  362                 m = ip6cp->ip6c_m;
  363                 ip6 = ip6cp->ip6c_ip6;
  364                 off = ip6cp->ip6c_off;
  365                 cmdarg = ip6cp->ip6c_cmdarg;
  366                 sa6_src = ip6cp->ip6c_src;
  367         } else {
  368                 m = NULL;
  369                 ip6 = NULL;
  370                 cmdarg = NULL;
  371                 sa6_src = &sa6_any;
  372         }
  373 
  374         (void) in6_pcbnotify(&V_ripcbinfo, sa, 0,
  375             (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
  376 }
  377 
  378 /*
  379  * Generate IPv6 header and pass packet to ip6_output.  Tack on options user
  380  * may have setup with control call.
  381  */
  382 int
  383 #if __STDC__
  384 rip6_output(struct mbuf *m, ...)
  385 #else
  386 rip6_output(m, va_alist)
  387         struct mbuf *m;
  388         va_dcl
  389 #endif
  390 {
  391         struct mbuf *control;
  392         struct socket *so;
  393         struct sockaddr_in6 *dstsock;
  394         struct in6_addr *dst;
  395         struct ip6_hdr *ip6;
  396         struct inpcb *in6p;
  397         u_int   plen = m->m_pkthdr.len;
  398         int error = 0;
  399         struct ip6_pktopts opt, *optp;
  400         struct ifnet *oifp = NULL;
  401         int type = 0, code = 0;         /* for ICMPv6 output statistics only */
  402         int scope_ambiguous = 0;
  403         struct in6_addr in6a;
  404         va_list ap;
  405 
  406         va_start(ap, m);
  407         so = va_arg(ap, struct socket *);
  408         dstsock = va_arg(ap, struct sockaddr_in6 *);
  409         control = va_arg(ap, struct mbuf *);
  410         va_end(ap);
  411 
  412         in6p = sotoinpcb(so);
  413         INP_WLOCK(in6p);
  414 
  415         dst = &dstsock->sin6_addr;
  416         if (control != NULL) {
  417                 if ((error = ip6_setpktopts(control, &opt,
  418                     in6p->in6p_outputopts, so->so_cred,
  419                     so->so_proto->pr_protocol)) != 0) {
  420                         goto bad;
  421                 }
  422                 optp = &opt;
  423         } else
  424                 optp = in6p->in6p_outputopts;
  425 
  426         /*
  427          * Check and convert scope zone ID into internal form.
  428          *
  429          * XXX: we may still need to determine the zone later.
  430          */
  431         if (!(so->so_state & SS_ISCONNECTED)) {
  432                 if (dstsock->sin6_scope_id == 0 && !V_ip6_use_defzone)
  433                         scope_ambiguous = 1;
  434                 if ((error = sa6_embedscope(dstsock, V_ip6_use_defzone)) != 0)
  435                         goto bad;
  436         }
  437 
  438         /*
  439          * For an ICMPv6 packet, we should know its type and code to update
  440          * statistics.
  441          */
  442         if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
  443                 struct icmp6_hdr *icmp6;
  444                 if (m->m_len < sizeof(struct icmp6_hdr) &&
  445                     (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) {
  446                         error = ENOBUFS;
  447                         goto bad;
  448                 }
  449                 icmp6 = mtod(m, struct icmp6_hdr *);
  450                 type = icmp6->icmp6_type;
  451                 code = icmp6->icmp6_code;
  452         }
  453 
  454         M_PREPEND(m, sizeof(*ip6), M_DONTWAIT);
  455         if (m == NULL) {
  456                 error = ENOBUFS;
  457                 goto bad;
  458         }
  459         ip6 = mtod(m, struct ip6_hdr *);
  460 
  461         /*
  462          * Source address selection.
  463          */
  464         error = in6_selectsrc(dstsock, optp, in6p, NULL, so->so_cred,
  465             &oifp, &in6a);
  466         if (error)
  467                 goto bad;
  468         error = prison_check_ip6(in6p->inp_cred, &in6a);
  469         if (error != 0)
  470                 goto bad;
  471         ip6->ip6_src = in6a;
  472 
  473         if (oifp && scope_ambiguous) {
  474                 /*
  475                  * Application should provide a proper zone ID or the use of
  476                  * default zone IDs should be enabled.  Unfortunately, some
  477                  * applications do not behave as it should, so we need a
  478                  * workaround.  Even if an appropriate ID is not determined
  479                  * (when it's required), if we can determine the outgoing
  480                  * interface. determine the zone ID based on the interface.
  481                  */
  482                 error = in6_setscope(&dstsock->sin6_addr, oifp, NULL);
  483                 if (error != 0)
  484                         goto bad;
  485         }
  486         ip6->ip6_dst = dstsock->sin6_addr;
  487 
  488         /*
  489          * Fill in the rest of the IPv6 header fields.
  490          */
  491         ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) |
  492             (in6p->inp_flow & IPV6_FLOWINFO_MASK);
  493         ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) |
  494             (IPV6_VERSION & IPV6_VERSION_MASK);
  495 
  496         /*
  497          * ip6_plen will be filled in ip6_output, so not fill it here.
  498          */
  499         ip6->ip6_nxt = in6p->inp_ip_p;
  500         ip6->ip6_hlim = in6_selecthlim(in6p, oifp);
  501 
  502         if (so->so_proto->pr_protocol == IPPROTO_ICMPV6 ||
  503             in6p->in6p_cksum != -1) {
  504                 struct mbuf *n;
  505                 int off;
  506                 u_int16_t *p;
  507 
  508                 /* Compute checksum. */
  509                 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
  510                         off = offsetof(struct icmp6_hdr, icmp6_cksum);
  511                 else
  512                         off = in6p->in6p_cksum;
  513                 if (plen < off + 1) {
  514                         error = EINVAL;
  515                         goto bad;
  516                 }
  517                 off += sizeof(struct ip6_hdr);
  518 
  519                 n = m;
  520                 while (n && n->m_len <= off) {
  521                         off -= n->m_len;
  522                         n = n->m_next;
  523                 }
  524                 if (!n)
  525                         goto bad;
  526                 p = (u_int16_t *)(mtod(n, caddr_t) + off);
  527                 *p = 0;
  528                 *p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen);
  529         }
  530 
  531         error = ip6_output(m, optp, NULL, 0, in6p->in6p_moptions, &oifp, in6p);
  532         if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
  533                 if (oifp)
  534                         icmp6_ifoutstat_inc(oifp, type, code);
  535                 ICMP6STAT_INC(icp6s_outhist[type]);
  536         } else
  537                 V_rip6stat.rip6s_opackets++;
  538 
  539         goto freectl;
  540 
  541  bad:
  542         if (m)
  543                 m_freem(m);
  544 
  545  freectl:
  546         if (control != NULL) {
  547                 ip6_clearpktopts(&opt, -1);
  548                 m_freem(control);
  549         }
  550         INP_WUNLOCK(in6p);
  551         return (error);
  552 }
  553 
  554 /*
  555  * Raw IPv6 socket option processing.
  556  */
  557 int
  558 rip6_ctloutput(struct socket *so, struct sockopt *sopt)
  559 {
  560         int error;
  561 
  562         if (sopt->sopt_level == IPPROTO_ICMPV6)
  563                 /*
  564                  * XXX: is it better to call icmp6_ctloutput() directly
  565                  * from protosw?
  566                  */
  567                 return (icmp6_ctloutput(so, sopt));
  568         else if (sopt->sopt_level != IPPROTO_IPV6)
  569                 return (EINVAL);
  570 
  571         error = 0;
  572 
  573         switch (sopt->sopt_dir) {
  574         case SOPT_GET:
  575                 switch (sopt->sopt_name) {
  576                 case MRT6_INIT:
  577                 case MRT6_DONE:
  578                 case MRT6_ADD_MIF:
  579                 case MRT6_DEL_MIF:
  580                 case MRT6_ADD_MFC:
  581                 case MRT6_DEL_MFC:
  582                 case MRT6_PIM:
  583                         error = ip6_mrouter_get ?  ip6_mrouter_get(so, sopt) :
  584                             EOPNOTSUPP;
  585                         break;
  586                 case IPV6_CHECKSUM:
  587                         error = ip6_raw_ctloutput(so, sopt);
  588                         break;
  589                 default:
  590                         error = ip6_ctloutput(so, sopt);
  591                         break;
  592                 }
  593                 break;
  594 
  595         case SOPT_SET:
  596                 switch (sopt->sopt_name) {
  597                 case MRT6_INIT:
  598                 case MRT6_DONE:
  599                 case MRT6_ADD_MIF:
  600                 case MRT6_DEL_MIF:
  601                 case MRT6_ADD_MFC:
  602                 case MRT6_DEL_MFC:
  603                 case MRT6_PIM:
  604                         error = ip6_mrouter_set ?  ip6_mrouter_set(so, sopt) :
  605                             EOPNOTSUPP;
  606                         break;
  607                 case IPV6_CHECKSUM:
  608                         error = ip6_raw_ctloutput(so, sopt);
  609                         break;
  610                 default:
  611                         error = ip6_ctloutput(so, sopt);
  612                         break;
  613                 }
  614                 break;
  615         }
  616 
  617         return (error);
  618 }
  619 
  620 static int
  621 rip6_attach(struct socket *so, int proto, struct thread *td)
  622 {
  623         struct inpcb *inp;
  624         struct icmp6_filter *filter;
  625         int error;
  626 
  627         inp = sotoinpcb(so);
  628         KASSERT(inp == NULL, ("rip6_attach: inp != NULL"));
  629 
  630         error = priv_check(td, PRIV_NETINET_RAW);
  631         if (error)
  632                 return (error);
  633         error = soreserve(so, rip_sendspace, rip_recvspace);
  634         if (error)
  635                 return (error);
  636         filter = malloc(sizeof(struct icmp6_filter), M_PCB, M_NOWAIT);
  637         if (filter == NULL)
  638                 return (ENOMEM);
  639         INP_INFO_WLOCK(&V_ripcbinfo);
  640         error = in_pcballoc(so, &V_ripcbinfo);
  641         if (error) {
  642                 INP_INFO_WUNLOCK(&V_ripcbinfo);
  643                 free(filter, M_PCB);
  644                 return (error);
  645         }
  646         inp = (struct inpcb *)so->so_pcb;
  647         INP_INFO_WUNLOCK(&V_ripcbinfo);
  648         inp->inp_vflag |= INP_IPV6;
  649         inp->inp_ip_p = (long)proto;
  650         inp->in6p_hops = -1;    /* use kernel default */
  651         inp->in6p_cksum = -1;
  652         inp->in6p_icmp6filt = filter;
  653         ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt);
  654         INP_WUNLOCK(inp);
  655         return (0);
  656 }
  657 
  658 static void
  659 rip6_detach(struct socket *so)
  660 {
  661         struct inpcb *inp;
  662 
  663         inp = sotoinpcb(so);
  664         KASSERT(inp != NULL, ("rip6_detach: inp == NULL"));
  665 
  666         if (so == V_ip6_mrouter && ip6_mrouter_done)
  667                 ip6_mrouter_done();
  668         /* xxx: RSVP */
  669         INP_INFO_WLOCK(&V_ripcbinfo);
  670         INP_WLOCK(inp);
  671         free(inp->in6p_icmp6filt, M_PCB);
  672         in_pcbdetach(inp);
  673         in_pcbfree(inp);
  674         INP_INFO_WUNLOCK(&V_ripcbinfo);
  675 }
  676 
  677 /* XXXRW: This can't ever be called. */
  678 static void
  679 rip6_abort(struct socket *so)
  680 {
  681         struct inpcb *inp;
  682 
  683         inp = sotoinpcb(so);
  684         KASSERT(inp != NULL, ("rip6_abort: inp == NULL"));
  685 
  686         soisdisconnected(so);
  687 }
  688 
  689 static void
  690 rip6_close(struct socket *so)
  691 {
  692         struct inpcb *inp;
  693 
  694         inp = sotoinpcb(so);
  695         KASSERT(inp != NULL, ("rip6_close: inp == NULL"));
  696 
  697         soisdisconnected(so);
  698 }
  699 
  700 static int
  701 rip6_disconnect(struct socket *so)
  702 {
  703         struct inpcb *inp;
  704 
  705         inp = sotoinpcb(so);
  706         KASSERT(inp != NULL, ("rip6_disconnect: inp == NULL"));
  707 
  708         if ((so->so_state & SS_ISCONNECTED) == 0)
  709                 return (ENOTCONN);
  710         inp->in6p_faddr = in6addr_any;
  711         rip6_abort(so);
  712         return (0);
  713 }
  714 
  715 static int
  716 rip6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
  717 {
  718         struct inpcb *inp;
  719         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
  720         struct ifaddr *ifa = NULL;
  721         int error = 0;
  722 
  723         inp = sotoinpcb(so);
  724         KASSERT(inp != NULL, ("rip6_bind: inp == NULL"));
  725 
  726         if (nam->sa_len != sizeof(*addr))
  727                 return (EINVAL);
  728         if ((error = prison_check_ip6(td->td_ucred, &addr->sin6_addr)) != 0)
  729                 return (error);
  730         if (TAILQ_EMPTY(&V_ifnet) || addr->sin6_family != AF_INET6)
  731                 return (EADDRNOTAVAIL);
  732         if ((error = sa6_embedscope(addr, V_ip6_use_defzone)) != 0)
  733                 return (error);
  734 
  735         if (!IN6_IS_ADDR_UNSPECIFIED(&addr->sin6_addr) &&
  736             (ifa = ifa_ifwithaddr((struct sockaddr *)addr)) == NULL)
  737                 return (EADDRNOTAVAIL);
  738         if (ifa != NULL &&
  739             ((struct in6_ifaddr *)ifa)->ia6_flags &
  740             (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|
  741              IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) {
  742                 ifa_free(ifa);
  743                 return (EADDRNOTAVAIL);
  744         }
  745         if (ifa != NULL)
  746                 ifa_free(ifa);
  747         INP_INFO_WLOCK(&V_ripcbinfo);
  748         INP_WLOCK(inp);
  749         inp->in6p_laddr = addr->sin6_addr;
  750         INP_WUNLOCK(inp);
  751         INP_INFO_WUNLOCK(&V_ripcbinfo);
  752         return (0);
  753 }
  754 
  755 static int
  756 rip6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
  757 {
  758         struct inpcb *inp;
  759         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
  760         struct in6_addr in6a;
  761         struct ifnet *ifp = NULL;
  762         int error = 0, scope_ambiguous = 0;
  763 
  764         inp = sotoinpcb(so);
  765         KASSERT(inp != NULL, ("rip6_connect: inp == NULL"));
  766 
  767         if (nam->sa_len != sizeof(*addr))
  768                 return (EINVAL);
  769         if (TAILQ_EMPTY(&V_ifnet))
  770                 return (EADDRNOTAVAIL);
  771         if (addr->sin6_family != AF_INET6)
  772                 return (EAFNOSUPPORT);
  773 
  774         /*
  775          * Application should provide a proper zone ID or the use of default
  776          * zone IDs should be enabled.  Unfortunately, some applications do
  777          * not behave as it should, so we need a workaround.  Even if an
  778          * appropriate ID is not determined, we'll see if we can determine
  779          * the outgoing interface.  If we can, determine the zone ID based on
  780          * the interface below.
  781          */
  782         if (addr->sin6_scope_id == 0 && !V_ip6_use_defzone)
  783                 scope_ambiguous = 1;
  784         if ((error = sa6_embedscope(addr, V_ip6_use_defzone)) != 0)
  785                 return (error);
  786 
  787         INP_INFO_WLOCK(&V_ripcbinfo);
  788         INP_WLOCK(inp);
  789         /* Source address selection. XXX: need pcblookup? */
  790         error = in6_selectsrc(addr, inp->in6p_outputopts,
  791             inp, NULL, so->so_cred, &ifp, &in6a);
  792         if (error) {
  793                 INP_WUNLOCK(inp);
  794                 INP_INFO_WUNLOCK(&V_ripcbinfo);
  795                 return (error);
  796         }
  797 
  798         /* XXX: see above */
  799         if (ifp && scope_ambiguous &&
  800             (error = in6_setscope(&addr->sin6_addr, ifp, NULL)) != 0) {
  801                 INP_WUNLOCK(inp);
  802                 INP_INFO_WUNLOCK(&V_ripcbinfo);
  803                 return (error);
  804         }
  805         inp->in6p_faddr = addr->sin6_addr;
  806         inp->in6p_laddr = in6a;
  807         soisconnected(so);
  808         INP_WUNLOCK(inp);
  809         INP_INFO_WUNLOCK(&V_ripcbinfo);
  810         return (0);
  811 }
  812 
  813 static int
  814 rip6_shutdown(struct socket *so)
  815 {
  816         struct inpcb *inp;
  817 
  818         inp = sotoinpcb(so);
  819         KASSERT(inp != NULL, ("rip6_shutdown: inp == NULL"));
  820 
  821         INP_WLOCK(inp);
  822         socantsendmore(so);
  823         INP_WUNLOCK(inp);
  824         return (0);
  825 }
  826 
  827 static int
  828 rip6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
  829     struct mbuf *control, struct thread *td)
  830 {
  831         struct inpcb *inp;
  832         struct sockaddr_in6 tmp;
  833         struct sockaddr_in6 *dst;
  834         int ret;
  835 
  836         inp = sotoinpcb(so);
  837         KASSERT(inp != NULL, ("rip6_send: inp == NULL"));
  838 
  839         /* Always copy sockaddr to avoid overwrites. */
  840         /* Unlocked read. */
  841         if (so->so_state & SS_ISCONNECTED) {
  842                 if (nam) {
  843                         m_freem(m);
  844                         return (EISCONN);
  845                 }
  846                 /* XXX */
  847                 bzero(&tmp, sizeof(tmp));
  848                 tmp.sin6_family = AF_INET6;
  849                 tmp.sin6_len = sizeof(struct sockaddr_in6);
  850                 INP_RLOCK(inp);
  851                 bcopy(&inp->in6p_faddr, &tmp.sin6_addr,
  852                     sizeof(struct in6_addr));
  853                 INP_RUNLOCK(inp);
  854                 dst = &tmp;
  855         } else {
  856                 if (nam == NULL) {
  857                         m_freem(m);
  858                         return (ENOTCONN);
  859                 }
  860                 if (nam->sa_len != sizeof(struct sockaddr_in6)) {
  861                         m_freem(m);
  862                         return (EINVAL);
  863                 }
  864                 tmp = *(struct sockaddr_in6 *)nam;
  865                 dst = &tmp;
  866 
  867                 if (dst->sin6_family == AF_UNSPEC) {
  868                         /*
  869                          * XXX: we allow this case for backward
  870                          * compatibility to buggy applications that
  871                          * rely on old (and wrong) kernel behavior.
  872                          */
  873                         log(LOG_INFO, "rip6 SEND: address family is "
  874                             "unspec. Assume AF_INET6\n");
  875                         dst->sin6_family = AF_INET6;
  876                 } else if (dst->sin6_family != AF_INET6) {
  877                         m_freem(m);
  878                         return(EAFNOSUPPORT);
  879                 }
  880         }
  881         ret = rip6_output(m, so, dst, control);
  882         return (ret);
  883 }
  884 
  885 struct pr_usrreqs rip6_usrreqs = {
  886         .pru_abort =            rip6_abort,
  887         .pru_attach =           rip6_attach,
  888         .pru_bind =             rip6_bind,
  889         .pru_connect =          rip6_connect,
  890         .pru_control =          in6_control,
  891         .pru_detach =           rip6_detach,
  892         .pru_disconnect =       rip6_disconnect,
  893         .pru_peeraddr =         in6_getpeeraddr,
  894         .pru_send =             rip6_send,
  895         .pru_shutdown =         rip6_shutdown,
  896         .pru_sockaddr =         in6_getsockaddr,
  897         .pru_close =            rip6_close,
  898 };

Cache object: af27364436fe746f4954b271aa80291e


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