in6_gif.c

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    1 /*      $FreeBSD: src/sys/netinet6/in6_gif.c,v 1.2.2.3 2001/07/03 11:01:52 ume Exp $    */
    2 /*      $KAME: in6_gif.c,v 1.49 2001/05/14 14:02:17 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 
   34 #include <sys/param.h>
   35 #include <sys/systm.h>
   36 #include <sys/socket.h>
   37 #include <sys/sockio.h>
   38 #include <sys/mbuf.h>
   39 #include <sys/errno.h>
   40 #include <sys/queue.h>
   41 #include <sys/syslog.h>
   42 
   43 #include <sys/malloc.h>
   44 #include <sys/protosw.h>
   45 
   46 #include <net/if.h>
   47 #include <net/route.h>
   48 
   49 #include <netinet/in.h>
   50 #include <netinet/in_systm.h>
   51 #if INET
   52 #include <netinet/ip.h>
   53 #endif
   54 #include <netinet/ip_encap.h>
   55 #if INET6
   56 #include <netinet/ip6.h>
   57 #include <netinet6/ip6_var.h>
   58 #include <netinet6/in6_gif.h>
   59 #include <netinet6/in6_var.h>
   60 #endif
   61 #include <netinet/ip_ecn.h>
   62 #if INET6
   63 #include <netinet6/ip6_ecn.h>
   64 #endif
   65 
   66 #include <net/if_gif.h>
   67 
   68 #include <net/net_osdep.h>
   69 
   70 int
   71 in6_gif_output(ifp, family, m, rt)
   72         struct ifnet *ifp;
   73         int family; /* family of the packet to be encapsulate. */
   74         struct mbuf *m;
   75         struct rtentry *rt;
   76 {
   77         struct gif_softc *sc = (struct gif_softc*)ifp;
   78         struct sockaddr_in6 *dst = (struct sockaddr_in6 *)&sc->gif_ro6.ro_dst;
   79         struct sockaddr_in6 *sin6_src = (struct sockaddr_in6 *)sc->gif_psrc;
   80         struct sockaddr_in6 *sin6_dst = (struct sockaddr_in6 *)sc->gif_pdst;
   81         struct ip6_hdr *ip6;
   82         int proto;
   83         u_int8_t itos, otos;
   84 
   85         if (sin6_src == NULL || sin6_dst == NULL ||
   86             sin6_src->sin6_family != AF_INET6 ||
   87             sin6_dst->sin6_family != AF_INET6) {
   88                 m_freem(m);
   89                 return EAFNOSUPPORT;
   90         }
   91 
   92         switch (family) {
   93 #if INET
   94         case AF_INET:
   95             {
   96                 struct ip *ip;
   97 
   98                 proto = IPPROTO_IPV4;
   99                 if (m->m_len < sizeof(*ip)) {
  100                         m = m_pullup(m, sizeof(*ip));
  101                         if (!m)
  102                                 return ENOBUFS;
  103                 }
  104                 ip = mtod(m, struct ip *);
  105                 itos = ip->ip_tos;
  106                 break;
  107             }
  108 #endif
  109 #if INET6
  110         case AF_INET6:
  111             {
  112                 struct ip6_hdr *ip6;
  113                 proto = IPPROTO_IPV6;
  114                 if (m->m_len < sizeof(*ip6)) {
  115                         m = m_pullup(m, sizeof(*ip6));
  116                         if (!m)
  117                                 return ENOBUFS;
  118                 }
  119                 ip6 = mtod(m, struct ip6_hdr *);
  120                 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
  121                 break;
  122             }
  123 #endif
  124         default:
  125 #if DEBUG
  126                 printf("in6_gif_output: warning: unknown family %d passed\n",
  127                         family);
  128 #endif
  129                 m_freem(m);
  130                 return EAFNOSUPPORT;
  131         }
  132         
  133         /* prepend new IP header */
  134         M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT);
  135         if (m && m->m_len < sizeof(struct ip6_hdr))
  136                 m = m_pullup(m, sizeof(struct ip6_hdr));
  137         if (m == NULL) {
  138                 printf("ENOBUFS in in6_gif_output %d\n", __LINE__);
  139                 return ENOBUFS;
  140         }
  141 
  142         ip6 = mtod(m, struct ip6_hdr *);
  143         ip6->ip6_flow   = 0;
  144         ip6->ip6_vfc    &= ~IPV6_VERSION_MASK;
  145         ip6->ip6_vfc    |= IPV6_VERSION;
  146         ip6->ip6_plen   = htons((u_short)m->m_pkthdr.len);
  147         ip6->ip6_nxt    = proto;
  148         ip6->ip6_hlim   = ip6_gif_hlim;
  149         ip6->ip6_src    = sin6_src->sin6_addr;
  150         /* bidirectional configured tunnel mode */
  151         if (!IN6_IS_ADDR_UNSPECIFIED(&sin6_dst->sin6_addr))
  152                 ip6->ip6_dst = sin6_dst->sin6_addr;
  153         else  {
  154                 m_freem(m);
  155                 return ENETUNREACH;
  156         }
  157         if (ifp->if_flags & IFF_LINK1)
  158                 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos);
  159         else
  160                 ip_ecn_ingress(ECN_NOCARE, &otos, &itos);
  161         ip6->ip6_flow &= ~ntohl(0xff00000);
  162         ip6->ip6_flow |= htonl((u_int32_t)otos << 20);
  163 
  164         if (dst->sin6_family != sin6_dst->sin6_family ||
  165              !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &sin6_dst->sin6_addr)) {
  166                 /* cache route doesn't match */
  167                 bzero(dst, sizeof(*dst));
  168                 dst->sin6_family = sin6_dst->sin6_family;
  169                 dst->sin6_len = sizeof(struct sockaddr_in6);
  170                 dst->sin6_addr = sin6_dst->sin6_addr;
  171                 if (sc->gif_ro6.ro_rt) {
  172                         rtfree(sc->gif_ro6.ro_rt);
  173                         sc->gif_ro6.ro_rt = NULL;
  174                 }
  175 #if 0
  176                 sc->gif_if.if_mtu = GIF_MTU;
  177 #endif
  178         }
  179 
  180         if (sc->gif_ro6.ro_rt == NULL) {
  181                 rtalloc((struct route *)&sc->gif_ro6);
  182                 if (sc->gif_ro6.ro_rt == NULL) {
  183                         m_freem(m);
  184                         return ENETUNREACH;
  185                 }
  186 
  187                 /* if it constitutes infinite encapsulation, punt. */
  188                 if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
  189                         m_freem(m);
  190                         return ENETUNREACH;     /*XXX*/
  191                 }
  192 #if 0
  193                 ifp->if_mtu = sc->gif_ro6.ro_rt->rt_ifp->if_mtu
  194                         - sizeof(struct ip6_hdr);
  195 #endif
  196         }
  197         
  198 #if IPV6_MINMTU
  199         /*
  200          * force fragmentation to minimum MTU, to avoid path MTU discovery.
  201          * it is too painful to ask for resend of inner packet, to achieve
  202          * path MTU discovery for encapsulated packets.
  203          */
  204         return(ip6_output(m, 0, &sc->gif_ro6, IPV6_MINMTU, 0, NULL));
  205 #else
  206         return(ip6_output(m, 0, &sc->gif_ro6, 0, 0, NULL));
  207 #endif
  208 }
  209 
  210 int in6_gif_input(mp, offp)
  211         struct mbuf **mp;
  212         int *offp;
  213 {
  214         struct mbuf *m = *mp;
  215         struct ifnet *gifp = NULL;
  216         struct ip6_hdr *ip6;
  217         int af = 0;
  218         u_int32_t otos;
  219         u_int8_t proto;
  220 
  221         ip6 = mtod(m, struct ip6_hdr *);
  222 
  223         gifp = (struct ifnet *)encap_getarg(m);
  224 
  225         if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
  226                 m_freem(m);
  227                 ip6stat.ip6s_nogif++;
  228                 return IPPROTO_DONE;
  229         }
  230 
  231         proto = ip6->ip6_nxt;
  232         otos = ip6->ip6_flow;
  233         m_adj(m, *offp);
  234 
  235         switch (proto) {
  236 #if INET
  237         case IPPROTO_IPV4:
  238             {
  239                 struct ip *ip;
  240                 u_int8_t otos8;
  241                 af = AF_INET;
  242                 otos8 = (ntohl(otos) >> 20) & 0xff;
  243                 if (m->m_len < sizeof(*ip)) {
  244                         m = m_pullup(m, sizeof(*ip));
  245                         if (!m)
  246                                 return IPPROTO_DONE;
  247                 }
  248                 ip = mtod(m, struct ip *);
  249                 if (gifp->if_flags & IFF_LINK1)
  250                         ip_ecn_egress(ECN_ALLOWED, &otos8, &ip->ip_tos);
  251                 else
  252                         ip_ecn_egress(ECN_NOCARE, &otos8, &ip->ip_tos);
  253                 break;
  254             }
  255 #endif /* INET */
  256 #if INET6
  257         case IPPROTO_IPV6:
  258             {
  259                 struct ip6_hdr *ip6;
  260                 af = AF_INET6;
  261                 if (m->m_len < sizeof(*ip6)) {
  262                         m = m_pullup(m, sizeof(*ip6));
  263                         if (!m)
  264                                 return IPPROTO_DONE;
  265                 }
  266                 ip6 = mtod(m, struct ip6_hdr *);
  267                 if (gifp->if_flags & IFF_LINK1)
  268                         ip6_ecn_egress(ECN_ALLOWED, &otos, &ip6->ip6_flow);
  269                 else
  270                         ip6_ecn_egress(ECN_NOCARE, &otos, &ip6->ip6_flow);
  271                 break;
  272             }
  273 #endif
  274         default:
  275                 ip6stat.ip6s_nogif++;
  276                 m_freem(m);
  277                 return IPPROTO_DONE;
  278         }
  279                 
  280         dlil_input(gifp, m, m);
  281         return IPPROTO_DONE;
  282 }
  283 
  284 /*
  285  * validate outer address.
  286  */
  287 static int
  288 gif_validate6(ip6, sc, ifp)
  289         const struct ip6_hdr *ip6;
  290         struct gif_softc *sc;
  291         struct ifnet *ifp;
  292 {
  293         struct sockaddr_in6 *src, *dst;
  294 
  295         src = (struct sockaddr_in6 *)sc->gif_psrc;
  296         dst = (struct sockaddr_in6 *)sc->gif_pdst;
  297 
  298         /*
  299          * Check for address match.  Note that the check is for an incoming
  300          * packet.  We should compare the *source* address in our configuration
  301          * and the *destination* address of the packet, and vice versa.
  302          */
  303         if (!IN6_ARE_ADDR_EQUAL(&src->sin6_addr, &ip6->ip6_dst) ||
  304             !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_src))
  305                 return 0;
  306 
  307         /* martian filters on outer source - done in ip6_input */
  308 
  309         /* ingress filters on outer source */
  310         if ((sc->gif_if.if_flags & IFF_LINK2) == 0 && ifp) {
  311                 struct sockaddr_in6 sin6;
  312                 struct rtentry *rt;
  313 
  314                 bzero(&sin6, sizeof(sin6));
  315                 sin6.sin6_family = AF_INET6;
  316                 sin6.sin6_len = sizeof(struct sockaddr_in6);
  317                 sin6.sin6_addr = ip6->ip6_src;
  318 #ifndef SCOPEDROUTING
  319                 sin6.sin6_scope_id = 0; /* XXX */
  320 #endif
  321 
  322                 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
  323                 if (!rt || rt->rt_ifp != ifp) {
  324 #if 0
  325                         log(LOG_WARNING, "%s: packet from %s dropped "
  326                             "due to ingress filter\n", if_name(&sc->gif_if),
  327                             ip6_sprintf(&sin6.sin6_addr));
  328 #endif
  329                         if (rt)
  330                                 rtfree(rt);
  331                         return 0;
  332                 }
  333                 rtfree(rt);
  334         }
  335 
  336         return 128 * 2;
  337 }
  338 
  339 /*
  340  * we know that we are in IFF_UP, outer address available, and outer family
  341  * matched the physical addr family.  see gif_encapcheck().
  342  * sanity check for arg should have been done in the caller.
  343  */
  344 int
  345 gif_encapcheck6(m, off, proto, arg)
  346         const struct mbuf *m;
  347         int off;
  348         int proto;
  349         void *arg;
  350 {
  351         struct ip6_hdr ip6;
  352         struct gif_softc *sc;
  353         struct ifnet *ifp;
  354 
  355         /* sanity check done in caller */
  356         sc = (struct gif_softc *)arg;
  357 
  358         /* LINTED const cast */
  359         m_copydata(m, 0, sizeof(ip6), (caddr_t)&ip6);
  360         ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
  361 
  362         return gif_validate6(&ip6, sc, ifp);
  363 }
Cache object: 0593c30f288005eb5a48eb68e5443f41
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FreeBSD/Linux Kernel Cross Reference sys/bsd/netinet6/in6_gif.c

FreeBSD/Linux Kernel Cross Reference
sys/bsd/netinet6/in6_gif.c
