in_gif.c

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    1 /*      $FreeBSD$       */
    2 /*      $KAME: in_gif.c,v 1.54 2001/05/14 14:02:16 itojun Exp $ */
    3 
    4 /*-
    5  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the project nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  */
   32 
   33 #include "opt_mrouting.h"
   34 #include "opt_inet.h"
   35 #include "opt_inet6.h"
   36 
   37 #include <sys/param.h>
   38 #include <sys/systm.h>
   39 #include <sys/socket.h>
   40 #include <sys/sockio.h>
   41 #include <sys/mbuf.h>
   42 #include <sys/errno.h>
   43 #include <sys/kernel.h>
   44 #include <sys/sysctl.h>
   45 #include <sys/protosw.h>
   46 
   47 #include <sys/malloc.h>
   48 
   49 #include <net/if.h>
   50 #include <net/route.h>
   51 
   52 #include <netinet/in.h>
   53 #include <netinet/in_systm.h>
   54 #include <netinet/ip.h>
   55 #include <netinet/ip_var.h>
   56 #include <netinet/in_gif.h>
   57 #include <netinet/in_var.h>
   58 #include <netinet/ip_encap.h>
   59 #include <netinet/ip_ecn.h>
   60 
   61 #ifdef INET6
   62 #include <netinet/ip6.h>
   63 #endif
   64 
   65 #ifdef MROUTING
   66 #include <netinet/ip_mroute.h>
   67 #endif /* MROUTING */
   68 
   69 #include <net/if_gif.h> 
   70 
   71 #include <net/net_osdep.h>
   72 
   73 static int gif_validate4(const struct ip *, struct gif_softc *,
   74         struct ifnet *);
   75 
   76 extern  struct domain inetdomain;
   77 struct protosw in_gif_protosw =
   78 { SOCK_RAW,     &inetdomain,    0/* IPPROTO_IPV[46] */, PR_ATOMIC|PR_ADDR,
   79   in_gif_input, (pr_output_t*)rip_output, 0,    rip_ctloutput,
   80   0,
   81   0,            0,              0,              0,
   82   &rip_usrreqs
   83 };
   84 
   85 static int ip_gif_ttl = GIF_TTL;
   86 SYSCTL_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl, CTLFLAG_RW,
   87         &ip_gif_ttl,    0, "");
   88 
   89 int
   90 in_gif_output(ifp, family, m)
   91         struct ifnet    *ifp;
   92         int             family;
   93         struct mbuf     *m;
   94 {
   95         struct gif_softc *sc = (struct gif_softc*)ifp;
   96         struct sockaddr_in *dst = (struct sockaddr_in *)&sc->gif_ro.ro_dst;
   97         struct sockaddr_in *sin_src = (struct sockaddr_in *)sc->gif_psrc;
   98         struct sockaddr_in *sin_dst = (struct sockaddr_in *)sc->gif_pdst;
   99         struct ip iphdr;        /* capsule IP header, host byte ordered */
  100         int proto, error;
  101         u_int8_t tos;
  102 
  103         if (sin_src == NULL || sin_dst == NULL ||
  104             sin_src->sin_family != AF_INET ||
  105             sin_dst->sin_family != AF_INET) {
  106                 m_freem(m);
  107                 return EAFNOSUPPORT;
  108         }
  109 
  110         switch (family) {
  111 #ifdef INET
  112         case AF_INET:
  113             {
  114                 struct ip *ip;
  115 
  116                 proto = IPPROTO_IPV4;
  117                 if (m->m_len < sizeof(*ip)) {
  118                         m = m_pullup(m, sizeof(*ip));
  119                         if (!m)
  120                                 return ENOBUFS;
  121                 }
  122                 ip = mtod(m, struct ip *);
  123                 tos = ip->ip_tos;
  124                 break;
  125             }
  126 #endif /* INET */
  127 #ifdef INET6
  128         case AF_INET6:
  129             {
  130                 struct ip6_hdr *ip6;
  131                 proto = IPPROTO_IPV6;
  132                 if (m->m_len < sizeof(*ip6)) {
  133                         m = m_pullup(m, sizeof(*ip6));
  134                         if (!m)
  135                                 return ENOBUFS;
  136                 }
  137                 ip6 = mtod(m, struct ip6_hdr *);
  138                 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
  139                 break;
  140             }
  141 #endif /* INET6 */
  142         default:
  143 #ifdef DEBUG
  144                 printf("in_gif_output: warning: unknown family %d passed\n",
  145                         family);
  146 #endif
  147                 m_freem(m);
  148                 return EAFNOSUPPORT;
  149         }
  150 
  151         bzero(&iphdr, sizeof(iphdr));
  152         iphdr.ip_src = sin_src->sin_addr;
  153         /* bidirectional configured tunnel mode */
  154         if (sin_dst->sin_addr.s_addr != INADDR_ANY)
  155                 iphdr.ip_dst = sin_dst->sin_addr;
  156         else {
  157                 m_freem(m);
  158                 return ENETUNREACH;
  159         }
  160         iphdr.ip_p = proto;
  161         /* version will be set in ip_output() */
  162         iphdr.ip_ttl = ip_gif_ttl;
  163         iphdr.ip_len = m->m_pkthdr.len + sizeof(struct ip);
  164         ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED : ECN_NOCARE,
  165                        &iphdr.ip_tos, &tos);
  166 
  167         /* prepend new IP header */
  168         M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
  169         if (m && m->m_len < sizeof(struct ip))
  170                 m = m_pullup(m, sizeof(struct ip));
  171         if (m == NULL) {
  172                 printf("ENOBUFS in in_gif_output %d\n", __LINE__);
  173                 return ENOBUFS;
  174         }
  175         bcopy(&iphdr, mtod(m, struct ip *), sizeof(struct ip));
  176 
  177         if (dst->sin_family != sin_dst->sin_family ||
  178             dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr) {
  179                 /* cache route doesn't match */
  180                 bzero(dst, sizeof(*dst));
  181                 dst->sin_family = sin_dst->sin_family;
  182                 dst->sin_len = sizeof(struct sockaddr_in);
  183                 dst->sin_addr = sin_dst->sin_addr;
  184                 if (sc->gif_ro.ro_rt) {
  185                         RTFREE(sc->gif_ro.ro_rt);
  186                         sc->gif_ro.ro_rt = NULL;
  187                 }
  188 #if 0
  189                 sc->gif_if.if_mtu = GIF_MTU;
  190 #endif
  191         }
  192 
  193         if (sc->gif_ro.ro_rt == NULL) {
  194                 rtalloc_ign(&sc->gif_ro, 0);
  195                 if (sc->gif_ro.ro_rt == NULL) {
  196                         m_freem(m);
  197                         return ENETUNREACH;
  198                 }
  199 
  200                 /* if it constitutes infinite encapsulation, punt. */
  201                 if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
  202                         m_freem(m);
  203                         return ENETUNREACH;     /* XXX */
  204                 }
  205 #if 0
  206                 ifp->if_mtu = sc->gif_ro.ro_rt->rt_ifp->if_mtu
  207                         - sizeof(struct ip);
  208 #endif
  209         }
  210 
  211         error = ip_output(m, NULL, &sc->gif_ro, 0, NULL, NULL);
  212 
  213         if (!(sc->gif_if.if_flags & IFF_LINK0) &&
  214             sc->gif_ro.ro_rt != NULL) {
  215                 RTFREE(sc->gif_ro.ro_rt);
  216                 sc->gif_ro.ro_rt = NULL;
  217         }
  218 
  219         return (error);
  220 }
  221 
  222 void
  223 in_gif_input(m, off)
  224         struct mbuf *m;
  225         int off;
  226 {
  227         struct ifnet *gifp = NULL;
  228         struct ip *ip;
  229         int af;
  230         u_int8_t otos;
  231         int proto;
  232 
  233         ip = mtod(m, struct ip *);
  234         proto = ip->ip_p;
  235 
  236         gifp = (struct ifnet *)encap_getarg(m);
  237 
  238         if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
  239                 m_freem(m);
  240                 ipstat.ips_nogif++;
  241                 return;
  242         }
  243 
  244         otos = ip->ip_tos;
  245         m_adj(m, off);
  246 
  247         switch (proto) {
  248 #ifdef INET
  249         case IPPROTO_IPV4:
  250             {
  251                 struct ip *ip;
  252                 af = AF_INET;
  253                 if (m->m_len < sizeof(*ip)) {
  254                         m = m_pullup(m, sizeof(*ip));
  255                         if (!m)
  256                                 return;
  257                 }
  258                 ip = mtod(m, struct ip *);
  259                 if (ip_ecn_egress((gifp->if_flags & IFF_LINK1) ?
  260                                   ECN_ALLOWED : ECN_NOCARE,
  261                                   &otos, &ip->ip_tos) == 0) {
  262                         m_freem(m);
  263                         return;
  264                 }
  265                 break;
  266             }
  267 #endif
  268 #ifdef INET6
  269         case IPPROTO_IPV6:
  270             {
  271                 struct ip6_hdr *ip6;
  272                 u_int8_t itos, oitos;
  273 
  274                 af = AF_INET6;
  275                 if (m->m_len < sizeof(*ip6)) {
  276                         m = m_pullup(m, sizeof(*ip6));
  277                         if (!m)
  278                                 return;
  279                 }
  280                 ip6 = mtod(m, struct ip6_hdr *);
  281                 itos = oitos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
  282                 if (ip_ecn_egress((gifp->if_flags & IFF_LINK1) ?
  283                                   ECN_ALLOWED : ECN_NOCARE,
  284                                   &otos, &itos) == 0) {
  285                         m_freem(m);
  286                         return;
  287                 }
  288                 if (itos != oitos) {
  289                         ip6->ip6_flow &= ~htonl(0xff << 20);
  290                         ip6->ip6_flow |= htonl((u_int32_t)itos << 20);
  291                 }
  292                 break;
  293             }
  294 #endif /* INET6 */
  295         default:
  296                 ipstat.ips_nogif++;
  297                 m_freem(m);
  298                 return;
  299         }
  300         gif_input(m, af, gifp);
  301         return;
  302 }
  303 
  304 /*
  305  * validate outer address.
  306  */
  307 static int
  308 gif_validate4(ip, sc, ifp)
  309         const struct ip *ip;
  310         struct gif_softc *sc;
  311         struct ifnet *ifp;
  312 {
  313         struct sockaddr_in *src, *dst;
  314         struct in_ifaddr *ia4;
  315 
  316         src = (struct sockaddr_in *)sc->gif_psrc;
  317         dst = (struct sockaddr_in *)sc->gif_pdst;
  318 
  319         /* check for address match */
  320         if (src->sin_addr.s_addr != ip->ip_dst.s_addr ||
  321             dst->sin_addr.s_addr != ip->ip_src.s_addr)
  322                 return 0;
  323 
  324         /* martian filters on outer source - NOT done in ip_input! */
  325         if (IN_MULTICAST(ntohl(ip->ip_src.s_addr)))
  326                 return 0;
  327         switch ((ntohl(ip->ip_src.s_addr) & 0xff000000) >> 24) {
  328         case 0: case 127: case 255:
  329                 return 0;
  330         }
  331         /* reject packets with broadcast on source */
  332         TAILQ_FOREACH(ia4, &in_ifaddrhead, ia_link) {
  333                 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0)
  334                         continue;
  335                 if (ip->ip_src.s_addr == ia4->ia_broadaddr.sin_addr.s_addr)
  336                         return 0;
  337         }
  338 
  339         /* ingress filters on outer source */
  340         if ((sc->gif_if.if_flags & IFF_LINK2) == 0 && ifp) {
  341                 struct sockaddr_in sin;
  342                 struct rtentry *rt;
  343 
  344                 bzero(&sin, sizeof(sin));
  345                 sin.sin_family = AF_INET;
  346                 sin.sin_len = sizeof(struct sockaddr_in);
  347                 sin.sin_addr = ip->ip_src;
  348                 rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL);
  349                 if (!rt || rt->rt_ifp != ifp) {
  350 #if 0
  351                         log(LOG_WARNING, "%s: packet from 0x%x dropped "
  352                             "due to ingress filter\n", if_name(&sc->gif_if),
  353                             (u_int32_t)ntohl(sin.sin_addr.s_addr));
  354 #endif
  355                         if (rt)
  356                                 rtfree(rt);
  357                         return 0;
  358                 }
  359                 rtfree(rt);
  360         }
  361 
  362         return 32 * 2;
  363 }
  364 
  365 /*
  366  * we know that we are in IFF_UP, outer address available, and outer family
  367  * matched the physical addr family.  see gif_encapcheck().
  368  */
  369 int
  370 gif_encapcheck4(m, off, proto, arg)
  371         const struct mbuf *m;
  372         int off;
  373         int proto;
  374         void *arg;
  375 {
  376         struct ip ip;
  377         struct gif_softc *sc;
  378         struct ifnet *ifp;
  379 
  380         /* sanity check done in caller */
  381         sc = (struct gif_softc *)arg;
  382 
  383         /* LINTED const cast */
  384         m_copydata(m, 0, sizeof(ip), (caddr_t)&ip);
  385         ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
  386 
  387         return gif_validate4(&ip, sc, ifp);
  388 }
  389 
  390 int
  391 in_gif_attach(sc)
  392         struct gif_softc *sc;
  393 {
  394         sc->encap_cookie4 = encap_attach_func(AF_INET, -1, gif_encapcheck,
  395             &in_gif_protosw, sc);
  396         if (sc->encap_cookie4 == NULL)
  397                 return EEXIST;
  398         return 0;
  399 }
  400 
  401 int
  402 in_gif_detach(sc)
  403         struct gif_softc *sc;
  404 {
  405         int error;
  406 
  407         error = encap_detach(sc->encap_cookie4);
  408         if (error == 0)
  409                 sc->encap_cookie4 = NULL;
  410         return error;
  411 }
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FreeBSD/Linux Kernel Cross Reference sys/netinet/in_gif.c

FreeBSD/Linux Kernel Cross Reference
sys/netinet/in_gif.c
