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_inet.h"
   34 #include "opt_inet6.h"
   35 
   36 #include <sys/param.h>
   37 #include <sys/systm.h>
   38 #include <sys/socket.h>
   39 #include <sys/sockio.h>
   40 #include <sys/mbuf.h>
   41 #include <sys/errno.h>
   42 #include <sys/kernel.h>
   43 #include <sys/sysctl.h>
   44 #include <sys/protosw.h>
   45 
   46 #include <sys/malloc.h>
   47 
   48 #include <net/if.h>
   49 #include <net/route.h>
   50 
   51 #include <netinet/in.h>
   52 #include <netinet/in_systm.h>
   53 #include <netinet/ip.h>
   54 #include <netinet/ip_var.h>
   55 #include <netinet/in_gif.h>
   56 #include <netinet/in_var.h>
   57 #include <netinet/ip_encap.h>
   58 #include <netinet/ip_ecn.h>
   59 
   60 #ifdef INET6
   61 #include <netinet/ip6.h>
   62 #endif
   63 
   64 #include <net/if_gif.h> 
   65 
   66 #include <net/net_osdep.h>
   67 
   68 static int gif_validate4 __P((const struct ip *, struct gif_softc *,
   69         struct ifnet *));
   70 
   71 extern  struct domain inetdomain;
   72 struct protosw in_gif_protosw =
   73 { SOCK_RAW,     &inetdomain,    0/*IPPROTO_IPV[46]*/,   PR_ATOMIC|PR_ADDR,
   74   in_gif_input, rip_output,     0,              rip_ctloutput,
   75   0,
   76   0,            0,              0,              0,
   77   &rip_usrreqs
   78 };
   79 
   80 int ip_gif_ttl = GIF_TTL;
   81 SYSCTL_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl, CTLFLAG_RW,
   82         &ip_gif_ttl,    0, "");
   83 
   84 int
   85 in_gif_output(ifp, family, m)
   86         struct ifnet    *ifp;
   87         int             family;
   88         struct mbuf     *m;
   89 {
   90         struct gif_softc *sc = (struct gif_softc*)ifp;
   91         struct sockaddr_in *dst = (struct sockaddr_in *)&sc->gif_ro.ro_dst;
   92         struct sockaddr_in *sin_src = (struct sockaddr_in *)sc->gif_psrc;
   93         struct sockaddr_in *sin_dst = (struct sockaddr_in *)sc->gif_pdst;
   94         struct ip iphdr;        /* capsule IP header, host byte ordered */
   95         int proto, error;
   96         u_int8_t tos;
   97 
   98         if (sin_src == NULL || sin_dst == NULL ||
   99             sin_src->sin_family != AF_INET ||
  100             sin_dst->sin_family != AF_INET) {
  101                 m_freem(m);
  102                 return EAFNOSUPPORT;
  103         }
  104 
  105         switch (family) {
  106 #ifdef INET
  107         case AF_INET:
  108             {
  109                 struct ip *ip;
  110 
  111                 proto = IPPROTO_IPV4;
  112                 if (m->m_len < sizeof(*ip)) {
  113                         m = m_pullup(m, sizeof(*ip));
  114                         if (!m)
  115                                 return ENOBUFS;
  116                 }
  117                 ip = mtod(m, struct ip *);
  118                 tos = ip->ip_tos;
  119                 break;
  120             }
  121 #endif /* INET */
  122 #ifdef INET6
  123         case AF_INET6:
  124             {
  125                 struct ip6_hdr *ip6;
  126                 proto = IPPROTO_IPV6;
  127                 if (m->m_len < sizeof(*ip6)) {
  128                         m = m_pullup(m, sizeof(*ip6));
  129                         if (!m)
  130                                 return ENOBUFS;
  131                 }
  132                 ip6 = mtod(m, struct ip6_hdr *);
  133                 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
  134                 break;
  135             }
  136 #endif /* INET6 */
  137         default:
  138 #ifdef DEBUG
  139                 printf("in_gif_output: warning: unknown family %d passed\n",
  140                         family);
  141 #endif
  142                 m_freem(m);
  143                 return EAFNOSUPPORT;
  144         }
  145 
  146         bzero(&iphdr, sizeof(iphdr));
  147         iphdr.ip_src = sin_src->sin_addr;
  148         /* bidirectional configured tunnel mode */
  149         if (sin_dst->sin_addr.s_addr != INADDR_ANY)
  150                 iphdr.ip_dst = sin_dst->sin_addr;
  151         else {
  152                 m_freem(m);
  153                 return ENETUNREACH;
  154         }
  155         iphdr.ip_p = proto;
  156         /* version will be set in ip_output() */
  157         iphdr.ip_ttl = ip_gif_ttl;
  158         iphdr.ip_len = m->m_pkthdr.len + sizeof(struct ip);
  159         if (ifp->if_flags & IFF_LINK1)
  160                 ip_ecn_ingress(ECN_ALLOWED, &iphdr.ip_tos, &tos);
  161         else
  162                 ip_ecn_ingress(ECN_NOCARE, &iphdr.ip_tos, &tos);
  163 
  164         /* prepend new IP header */
  165         M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
  166         if (m && m->m_len < sizeof(struct ip))
  167                 m = m_pullup(m, sizeof(struct ip));
  168         if (m == NULL) {
  169                 printf("ENOBUFS in in_gif_output %d\n", __LINE__);
  170                 return ENOBUFS;
  171         }
  172         bcopy(&iphdr, mtod(m, struct ip *), sizeof(struct ip));
  173 
  174         if (dst->sin_family != sin_dst->sin_family ||
  175             dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr) {
  176                 /* cache route doesn't match */
  177                 dst->sin_family = sin_dst->sin_family;
  178                 dst->sin_len = sizeof(struct sockaddr_in);
  179                 dst->sin_addr = sin_dst->sin_addr;
  180                 if (sc->gif_ro.ro_rt) {
  181                         RTFREE(sc->gif_ro.ro_rt);
  182                         sc->gif_ro.ro_rt = NULL;
  183                 }
  184 #if 0
  185                 sc->gif_if.if_mtu = GIF_MTU;
  186 #endif
  187         }
  188 
  189         if (sc->gif_ro.ro_rt == NULL) {
  190                 rtalloc(&sc->gif_ro);
  191                 if (sc->gif_ro.ro_rt == NULL) {
  192                         m_freem(m);
  193                         return ENETUNREACH;
  194                 }
  195 
  196                 /* if it constitutes infinite encapsulation, punt. */
  197                 if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
  198                         m_freem(m);
  199                         return ENETUNREACH;     /* XXX */
  200                 }
  201 #if 0
  202                 ifp->if_mtu = sc->gif_ro.ro_rt->rt_ifp->if_mtu
  203                         - sizeof(struct ip);
  204 #endif
  205         }
  206 
  207         error = ip_output(m, NULL, &sc->gif_ro, 0, NULL, NULL);
  208 
  209         if (!(sc->gif_if.if_flags & IFF_LINK0) &&
  210             sc->gif_ro.ro_rt != NULL) {
  211                 RTFREE(sc->gif_ro.ro_rt);
  212                 sc->gif_ro.ro_rt = NULL;
  213         }
  214 
  215         return (error);
  216 }
  217 
  218 void
  219 in_gif_input(m, off, proto)
  220         struct mbuf *m;
  221         int off;
  222         int proto;
  223 {
  224         struct ifnet *gifp = NULL;
  225         struct ip *ip;
  226         int af;
  227         u_int8_t otos;
  228 
  229         ip = mtod(m, struct ip *);
  230 
  231         gifp = (struct ifnet *)encap_getarg(m);
  232 
  233         if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
  234                 m_freem(m);
  235                 ipstat.ips_nogif++;
  236                 return;
  237         }
  238 
  239         otos = ip->ip_tos;
  240         m_adj(m, off);
  241 
  242         switch (proto) {
  243 #ifdef INET
  244         case IPPROTO_IPV4:
  245             {
  246                 struct ip *ip;
  247                 af = AF_INET;
  248                 if (m->m_len < sizeof(*ip)) {
  249                         m = m_pullup(m, sizeof(*ip));
  250                         if (!m)
  251                                 return;
  252                 }
  253                 ip = mtod(m, struct ip *);
  254                 if (gifp->if_flags & IFF_LINK1)
  255                         ip_ecn_egress(ECN_ALLOWED, &otos, &ip->ip_tos);
  256                 else
  257                         ip_ecn_egress(ECN_NOCARE, &otos, &ip->ip_tos);
  258                 break;
  259             }
  260 #endif
  261 #ifdef INET6
  262         case IPPROTO_IPV6:
  263             {
  264                 struct ip6_hdr *ip6;
  265                 u_int8_t itos;
  266                 af = AF_INET6;
  267                 if (m->m_len < sizeof(*ip6)) {
  268                         m = m_pullup(m, sizeof(*ip6));
  269                         if (!m)
  270                                 return;
  271                 }
  272                 ip6 = mtod(m, struct ip6_hdr *);
  273                 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
  274                 if (gifp->if_flags & IFF_LINK1)
  275                         ip_ecn_egress(ECN_ALLOWED, &otos, &itos);
  276                 else
  277                         ip_ecn_egress(ECN_NOCARE, &otos, &itos);
  278                 ip6->ip6_flow &= ~htonl(0xff << 20);
  279                 ip6->ip6_flow |= htonl((u_int32_t)itos << 20);
  280                 break;
  281             }
  282 #endif /* INET6 */
  283         default:
  284                 ipstat.ips_nogif++;
  285                 m_freem(m);
  286                 return;
  287         }
  288         gif_input(m, af, gifp);
  289         return;
  290 }
  291 
  292 /*
  293  * validate outer address.
  294  */
  295 static int
  296 gif_validate4(ip, sc, ifp)
  297         const struct ip *ip;
  298         struct gif_softc *sc;
  299         struct ifnet *ifp;
  300 {
  301         struct sockaddr_in *src, *dst;
  302         struct in_ifaddr *ia4;
  303 
  304         src = (struct sockaddr_in *)sc->gif_psrc;
  305         dst = (struct sockaddr_in *)sc->gif_pdst;
  306 
  307         /* check for address match */
  308         if (src->sin_addr.s_addr != ip->ip_dst.s_addr ||
  309             dst->sin_addr.s_addr != ip->ip_src.s_addr)
  310                 return 0;
  311 
  312         /* martian filters on outer source - NOT done in ip_input! */
  313         if (IN_MULTICAST(ntohl(ip->ip_src.s_addr)))
  314                 return 0;
  315         switch ((ntohl(ip->ip_src.s_addr) & 0xff000000) >> 24) {
  316         case 0: case 127: case 255:
  317                 return 0;
  318         }
  319         /* reject packets with broadcast on source */
  320         for (ia4 = TAILQ_FIRST(&in_ifaddrhead); ia4;
  321              ia4 = TAILQ_NEXT(ia4, ia_link))
  322         {
  323                 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0)
  324                         continue;
  325                 if (ip->ip_src.s_addr == ia4->ia_broadaddr.sin_addr.s_addr)
  326                         return 0;
  327         }
  328 
  329         /* ingress filters on outer source */
  330         if ((sc->gif_if.if_flags & IFF_LINK2) == 0 && ifp) {
  331                 struct sockaddr_in sin;
  332                 struct rtentry *rt;
  333 
  334                 bzero(&sin, sizeof(sin));
  335                 sin.sin_family = AF_INET;
  336                 sin.sin_len = sizeof(struct sockaddr_in);
  337                 sin.sin_addr = ip->ip_src;
  338                 rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL);
  339                 if (!rt || rt->rt_ifp != ifp) {
  340 #if 0
  341                         log(LOG_WARNING, "%s: packet from 0x%x dropped "
  342                             "due to ingress filter\n", if_name(&sc->gif_if),
  343                             (u_int32_t)ntohl(sin.sin_addr.s_addr));
  344 #endif
  345                         if (rt)
  346                                 rtfree(rt);
  347                         return 0;
  348                 }
  349                 rtfree(rt);
  350         }
  351 
  352         return 32 * 2;
  353 }
  354 
  355 /*
  356  * we know that we are in IFF_UP, outer address available, and outer family
  357  * matched the physical addr family.  see gif_encapcheck().
  358  */
  359 int
  360 gif_encapcheck4(m, off, proto, arg)
  361         const struct mbuf *m;
  362         int off;
  363         int proto;
  364         void *arg;
  365 {
  366         struct ip ip;
  367         struct gif_softc *sc;
  368         struct ifnet *ifp;
  369 
  370         /* sanity check done in caller */
  371         sc = (struct gif_softc *)arg;
  372 
  373         /* LINTED const cast */
  374         m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip);
  375         ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
  376 
  377         return gif_validate4(&ip, sc, ifp);
  378 }
  379 
  380 int
  381 in_gif_attach(sc)
  382         struct gif_softc *sc;
  383 {
  384         sc->encap_cookie4 = encap_attach_func(AF_INET, -1, gif_encapcheck,
  385             &in_gif_protosw, sc);
  386         if (sc->encap_cookie4 == NULL)
  387                 return EEXIST;
  388         return 0;
  389 }
  390 
  391 int
  392 in_gif_detach(sc)
  393         struct gif_softc *sc;
  394 {
  395         int error;
  396 
  397         error = encap_detach(sc->encap_cookie4);
  398         if (error == 0)
  399                 sc->encap_cookie4 = NULL;
  400         return error;
  401 }
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FreeBSD/Linux Kernel Cross Reference sys/netinet/in_gif.c

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