in6_gif.c

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    1 /*      $FreeBSD: releng/6.3/sys/netinet6/in6_gif.c 155104 2006-01-31 15:56:47Z glebius $       */
    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 #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/queue.h>
   43 #include <sys/syslog.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 #ifdef INET
   54 #include <netinet/ip.h>
   55 #endif
   56 #include <netinet/ip_encap.h>
   57 #ifdef INET6
   58 #include <netinet/ip6.h>
   59 #include <netinet6/ip6_var.h>
   60 #include <netinet6/in6_gif.h>
   61 #include <netinet6/in6_var.h>
   62 #endif
   63 #include <netinet6/ip6protosw.h>
   64 #include <netinet/ip_ecn.h>
   65 #ifdef INET6
   66 #include <netinet6/ip6_ecn.h>
   67 #endif
   68 
   69 #include <net/if_gif.h>
   70 
   71 #include <net/net_osdep.h>
   72 
   73 static int gif_validate6(const struct ip6_hdr *, struct gif_softc *,
   74                          struct ifnet *);
   75 
   76 extern  struct domain inet6domain;
   77 struct ip6protosw in6_gif_protosw =
   78 { SOCK_RAW,     &inet6domain,   0/* IPPROTO_IPV[46] */, PR_ATOMIC|PR_ADDR,
   79   in6_gif_input, rip6_output,   0,              rip6_ctloutput,
   80   0,
   81   0,            0,              0,              0,
   82   &rip6_usrreqs
   83 };
   84 
   85 int
   86 in6_gif_output(ifp, family, m)
   87         struct ifnet *ifp;
   88         int family; /* family of the packet to be encapsulate. */
   89         struct mbuf *m;
   90 {
   91         struct gif_softc *sc = ifp->if_softc;
   92         struct sockaddr_in6 *dst = (struct sockaddr_in6 *)&sc->gif_ro6.ro_dst;
   93         struct sockaddr_in6 *sin6_src = (struct sockaddr_in6 *)sc->gif_psrc;
   94         struct sockaddr_in6 *sin6_dst = (struct sockaddr_in6 *)sc->gif_pdst;
   95         struct ip6_hdr *ip6;
   96         struct etherip_header eiphdr;
   97         int proto, error;
   98         u_int8_t itos, otos;
   99 
  100         GIF_LOCK_ASSERT(sc);
  101 
  102         if (sin6_src == NULL || sin6_dst == NULL ||
  103             sin6_src->sin6_family != AF_INET6 ||
  104             sin6_dst->sin6_family != AF_INET6) {
  105                 m_freem(m);
  106                 return EAFNOSUPPORT;
  107         }
  108 
  109         switch (family) {
  110 #ifdef INET
  111         case AF_INET:
  112             {
  113                 struct ip *ip;
  114 
  115                 proto = IPPROTO_IPV4;
  116                 if (m->m_len < sizeof(*ip)) {
  117                         m = m_pullup(m, sizeof(*ip));
  118                         if (!m)
  119                                 return ENOBUFS;
  120                 }
  121                 ip = mtod(m, struct ip *);
  122                 itos = ip->ip_tos;
  123                 break;
  124             }
  125 #endif
  126 #ifdef INET6
  127         case AF_INET6:
  128             {
  129                 struct ip6_hdr *ip6;
  130                 proto = IPPROTO_IPV6;
  131                 if (m->m_len < sizeof(*ip6)) {
  132                         m = m_pullup(m, sizeof(*ip6));
  133                         if (!m)
  134                                 return ENOBUFS;
  135                 }
  136                 ip6 = mtod(m, struct ip6_hdr *);
  137                 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
  138                 break;
  139             }
  140 #endif
  141         case AF_LINK:
  142                 proto = IPPROTO_ETHERIP;
  143                 eiphdr.eip_ver = ETHERIP_VERSION & ETHERIP_VER_VERS_MASK;
  144                 eiphdr.eip_pad = 0;
  145                 /* prepend Ethernet-in-IP header */
  146                 M_PREPEND(m, sizeof(struct etherip_header), M_DONTWAIT);
  147                 if (m && m->m_len < sizeof(struct etherip_header))
  148                         m = m_pullup(m, sizeof(struct etherip_header));
  149                 if (m == NULL)
  150                         return ENOBUFS;
  151                 bcopy(&eiphdr, mtod(m, struct etherip_header *),
  152                     sizeof(struct etherip_header));
  153                 break;
  154 
  155         default:
  156 #ifdef DEBUG
  157                 printf("in6_gif_output: warning: unknown family %d passed\n",
  158                         family);
  159 #endif
  160                 m_freem(m);
  161                 return EAFNOSUPPORT;
  162         }
  163 
  164         /* prepend new IP header */
  165         M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT);
  166         if (m && m->m_len < sizeof(struct ip6_hdr))
  167                 m = m_pullup(m, sizeof(struct ip6_hdr));
  168         if (m == NULL) {
  169                 printf("ENOBUFS in in6_gif_output %d\n", __LINE__);
  170                 return ENOBUFS;
  171         }
  172 
  173         ip6 = mtod(m, struct ip6_hdr *);
  174         ip6->ip6_flow   = 0;
  175         ip6->ip6_vfc    &= ~IPV6_VERSION_MASK;
  176         ip6->ip6_vfc    |= IPV6_VERSION;
  177         ip6->ip6_plen   = htons((u_short)m->m_pkthdr.len);
  178         ip6->ip6_nxt    = proto;
  179         ip6->ip6_hlim   = ip6_gif_hlim;
  180         ip6->ip6_src    = sin6_src->sin6_addr;
  181         /* bidirectional configured tunnel mode */
  182         if (!IN6_IS_ADDR_UNSPECIFIED(&sin6_dst->sin6_addr))
  183                 ip6->ip6_dst = sin6_dst->sin6_addr;
  184         else  {
  185                 m_freem(m);
  186                 return ENETUNREACH;
  187         }
  188         ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED : ECN_NOCARE,
  189                        &otos, &itos);
  190         ip6->ip6_flow &= ~htonl(0xff << 20);
  191         ip6->ip6_flow |= htonl((u_int32_t)otos << 20);
  192 
  193         if (dst->sin6_family != sin6_dst->sin6_family ||
  194              !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &sin6_dst->sin6_addr)) {
  195                 /* cache route doesn't match */
  196                 bzero(dst, sizeof(*dst));
  197                 dst->sin6_family = sin6_dst->sin6_family;
  198                 dst->sin6_len = sizeof(struct sockaddr_in6);
  199                 dst->sin6_addr = sin6_dst->sin6_addr;
  200                 if (sc->gif_ro6.ro_rt) {
  201                         RTFREE(sc->gif_ro6.ro_rt);
  202                         sc->gif_ro6.ro_rt = NULL;
  203                 }
  204 #if 0
  205                 GIF2IFP(sc)->if_mtu = GIF_MTU;
  206 #endif
  207         }
  208 
  209         if (sc->gif_ro6.ro_rt == NULL) {
  210                 rtalloc((struct route *)&sc->gif_ro6);
  211                 if (sc->gif_ro6.ro_rt == NULL) {
  212                         m_freem(m);
  213                         return ENETUNREACH;
  214                 }
  215 
  216                 /* if it constitutes infinite encapsulation, punt. */
  217                 if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
  218                         m_freem(m);
  219                         return ENETUNREACH;     /*XXX*/
  220                 }
  221 #if 0
  222                 ifp->if_mtu = sc->gif_ro6.ro_rt->rt_ifp->if_mtu
  223                         - sizeof(struct ip6_hdr);
  224 #endif
  225         }
  226 
  227 #ifdef IPV6_MINMTU
  228         /*
  229          * force fragmentation to minimum MTU, to avoid path MTU discovery.
  230          * it is too painful to ask for resend of inner packet, to achieve
  231          * path MTU discovery for encapsulated packets.
  232          */
  233         error = ip6_output(m, 0, &sc->gif_ro6, IPV6_MINMTU, 0, NULL, NULL);
  234 #else
  235         error = ip6_output(m, 0, &sc->gif_ro6, 0, 0, NULL, NULL);
  236 #endif
  237 
  238         if (!(GIF2IFP(sc)->if_flags & IFF_LINK0) &&
  239             sc->gif_ro6.ro_rt != NULL) {
  240                 RTFREE(sc->gif_ro6.ro_rt);
  241                 sc->gif_ro6.ro_rt = NULL;
  242         }
  243 
  244         return (error);
  245 }
  246 
  247 int
  248 in6_gif_input(mp, offp, proto)
  249         struct mbuf **mp;
  250         int *offp, proto;
  251 {
  252         struct mbuf *m = *mp;
  253         struct ifnet *gifp = NULL;
  254         struct gif_softc *sc;
  255         struct ip6_hdr *ip6;
  256         int af = 0;
  257         u_int32_t otos;
  258 
  259         ip6 = mtod(m, struct ip6_hdr *);
  260 
  261         sc = (struct gif_softc *)encap_getarg(m);
  262         if (sc == NULL) {
  263                 m_freem(m);
  264                 ip6stat.ip6s_nogif++;
  265                 return IPPROTO_DONE;
  266         }
  267 
  268         gifp = GIF2IFP(sc);
  269         if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
  270                 m_freem(m);
  271                 ip6stat.ip6s_nogif++;
  272                 return IPPROTO_DONE;
  273         }
  274 
  275         otos = ip6->ip6_flow;
  276         m_adj(m, *offp);
  277 
  278         switch (proto) {
  279 #ifdef INET
  280         case IPPROTO_IPV4:
  281             {
  282                 struct ip *ip;
  283                 u_int8_t otos8;
  284                 af = AF_INET;
  285                 otos8 = (ntohl(otos) >> 20) & 0xff;
  286                 if (m->m_len < sizeof(*ip)) {
  287                         m = m_pullup(m, sizeof(*ip));
  288                         if (!m)
  289                                 return IPPROTO_DONE;
  290                 }
  291                 ip = mtod(m, struct ip *);
  292                 if (ip_ecn_egress((gifp->if_flags & IFF_LINK1) ?
  293                                   ECN_ALLOWED : ECN_NOCARE,
  294                                   &otos8, &ip->ip_tos) == 0) {
  295                         m_freem(m);
  296                         return IPPROTO_DONE;
  297                 }
  298                 break;
  299             }
  300 #endif /* INET */
  301 #ifdef INET6
  302         case IPPROTO_IPV6:
  303             {
  304                 struct ip6_hdr *ip6;
  305                 af = AF_INET6;
  306                 if (m->m_len < sizeof(*ip6)) {
  307                         m = m_pullup(m, sizeof(*ip6));
  308                         if (!m)
  309                                 return IPPROTO_DONE;
  310                 }
  311                 ip6 = mtod(m, struct ip6_hdr *);
  312                 if (ip6_ecn_egress((gifp->if_flags & IFF_LINK1) ?
  313                                    ECN_ALLOWED : ECN_NOCARE,
  314                                    &otos, &ip6->ip6_flow) == 0) {
  315                         m_freem(m);
  316                         return IPPROTO_DONE;
  317                 }
  318                 break;
  319             }
  320 #endif
  321         case IPPROTO_ETHERIP:
  322                 af = AF_LINK;
  323                 break;  
  324 
  325         default:
  326                 ip6stat.ip6s_nogif++;
  327                 m_freem(m);
  328                 return IPPROTO_DONE;
  329         }
  330 
  331         gif_input(m, af, gifp);
  332         return IPPROTO_DONE;
  333 }
  334 
  335 /*
  336  * validate outer address.
  337  */
  338 static int
  339 gif_validate6(ip6, sc, ifp)
  340         const struct ip6_hdr *ip6;
  341         struct gif_softc *sc;
  342         struct ifnet *ifp;
  343 {
  344         struct sockaddr_in6 *src, *dst;
  345 
  346         src = (struct sockaddr_in6 *)sc->gif_psrc;
  347         dst = (struct sockaddr_in6 *)sc->gif_pdst;
  348 
  349         /*
  350          * Check for address match.  Note that the check is for an incoming
  351          * packet.  We should compare the *source* address in our configuration
  352          * and the *destination* address of the packet, and vice versa.
  353          */
  354         if (!IN6_ARE_ADDR_EQUAL(&src->sin6_addr, &ip6->ip6_dst) ||
  355             !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_src))
  356                 return 0;
  357 
  358         /* martian filters on outer source - done in ip6_input */
  359 
  360         /* ingress filters on outer source */
  361         if ((GIF2IFP(sc)->if_flags & IFF_LINK2) == 0 && ifp) {
  362                 struct sockaddr_in6 sin6;
  363                 struct rtentry *rt;
  364 
  365                 bzero(&sin6, sizeof(sin6));
  366                 sin6.sin6_family = AF_INET6;
  367                 sin6.sin6_len = sizeof(struct sockaddr_in6);
  368                 sin6.sin6_addr = ip6->ip6_src;
  369                 sin6.sin6_scope_id = 0; /* XXX */
  370 
  371                 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
  372                 if (!rt || rt->rt_ifp != ifp) {
  373 #if 0
  374                         log(LOG_WARNING, "%s: packet from %s dropped "
  375                             "due to ingress filter\n", if_name(GIF2IFP(sc)),
  376                             ip6_sprintf(&sin6.sin6_addr));
  377 #endif
  378                         if (rt)
  379                                 rtfree(rt);
  380                         return 0;
  381                 }
  382                 rtfree(rt);
  383         }
  384 
  385         return 128 * 2;
  386 }
  387 
  388 /*
  389  * we know that we are in IFF_UP, outer address available, and outer family
  390  * matched the physical addr family.  see gif_encapcheck().
  391  * sanity check for arg should have been done in the caller.
  392  */
  393 int
  394 gif_encapcheck6(m, off, proto, arg)
  395         const struct mbuf *m;
  396         int off;
  397         int proto;
  398         void *arg;
  399 {
  400         struct ip6_hdr ip6;
  401         struct gif_softc *sc;
  402         struct ifnet *ifp;
  403 
  404         /* sanity check done in caller */
  405         sc = (struct gif_softc *)arg;
  406 
  407         /* LINTED const cast */
  408         m_copydata(m, 0, sizeof(ip6), (caddr_t)&ip6);
  409         ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
  410 
  411         return gif_validate6(&ip6, sc, ifp);
  412 }
  413 
  414 int
  415 in6_gif_attach(sc)
  416         struct gif_softc *sc;
  417 {
  418         sc->encap_cookie6 = encap_attach_func(AF_INET6, -1, gif_encapcheck,
  419             (struct protosw *)&in6_gif_protosw, sc);
  420         if (sc->encap_cookie6 == NULL)
  421                 return EEXIST;
  422         return 0;
  423 }
  424 
  425 int
  426 in6_gif_detach(sc)
  427         struct gif_softc *sc;
  428 {
  429         int error;
  430 
  431         error = encap_detach(sc->encap_cookie6);
  432         if (error == 0)
  433                 sc->encap_cookie6 = NULL;
  434         return error;
  435 }
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FreeBSD/Linux Kernel Cross Reference sys/netinet6/in6_gif.c

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