in6_gif.c

Version: - FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
    1 /*      $FreeBSD$       */
    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 domain6 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 = (struct gif_softc*)ifp;
   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         int proto, error;
   97         u_int8_t itos, otos;
   98 
   99         if (sin6_src == NULL || sin6_dst == NULL ||
  100             sin6_src->sin6_family != AF_INET6 ||
  101             sin6_dst->sin6_family != AF_INET6) {
  102                 m_freem(m);
  103                 return EAFNOSUPPORT;
  104         }
  105 
  106         switch (family) {
  107 #ifdef INET
  108         case AF_INET:
  109             {
  110                 struct ip *ip;
  111 
  112                 proto = IPPROTO_IPV4;
  113                 if (m->m_len < sizeof(*ip)) {
  114                         m = m_pullup(m, sizeof(*ip));
  115                         if (!m)
  116                                 return ENOBUFS;
  117                 }
  118                 ip = mtod(m, struct ip *);
  119                 itos = ip->ip_tos;
  120                 break;
  121             }
  122 #endif
  123 #ifdef INET6
  124         case AF_INET6:
  125             {
  126                 struct ip6_hdr *ip6;
  127                 proto = IPPROTO_IPV6;
  128                 if (m->m_len < sizeof(*ip6)) {
  129                         m = m_pullup(m, sizeof(*ip6));
  130                         if (!m)
  131                                 return ENOBUFS;
  132                 }
  133                 ip6 = mtod(m, struct ip6_hdr *);
  134                 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
  135                 break;
  136             }
  137 #endif
  138         default:
  139 #ifdef DEBUG
  140                 printf("in6_gif_output: warning: unknown family %d passed\n",
  141                         family);
  142 #endif
  143                 m_freem(m);
  144                 return EAFNOSUPPORT;
  145         }
  146         
  147         /* prepend new IP header */
  148         M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT);
  149         if (m && m->m_len < sizeof(struct ip6_hdr))
  150                 m = m_pullup(m, sizeof(struct ip6_hdr));
  151         if (m == NULL) {
  152                 printf("ENOBUFS in in6_gif_output %d\n", __LINE__);
  153                 return ENOBUFS;
  154         }
  155 
  156         ip6 = mtod(m, struct ip6_hdr *);
  157         ip6->ip6_flow   = 0;
  158         ip6->ip6_vfc    &= ~IPV6_VERSION_MASK;
  159         ip6->ip6_vfc    |= IPV6_VERSION;
  160         ip6->ip6_plen   = htons((u_short)m->m_pkthdr.len);
  161         ip6->ip6_nxt    = proto;
  162         ip6->ip6_hlim   = ip6_gif_hlim;
  163         ip6->ip6_src    = sin6_src->sin6_addr;
  164         /* bidirectional configured tunnel mode */
  165         if (!IN6_IS_ADDR_UNSPECIFIED(&sin6_dst->sin6_addr))
  166                 ip6->ip6_dst = sin6_dst->sin6_addr;
  167         else  {
  168                 m_freem(m);
  169                 return ENETUNREACH;
  170         }
  171         if (ifp->if_flags & IFF_LINK1)
  172                 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos);
  173         else
  174                 ip_ecn_ingress(ECN_NOCARE, &otos, &itos);
  175         ip6->ip6_flow &= ~ntohl(0xff00000);
  176         ip6->ip6_flow |= htonl((u_int32_t)otos << 20);
  177 
  178         if (dst->sin6_family != sin6_dst->sin6_family ||
  179              !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &sin6_dst->sin6_addr)) {
  180                 /* cache route doesn't match */
  181                 bzero(dst, sizeof(*dst));
  182                 dst->sin6_family = sin6_dst->sin6_family;
  183                 dst->sin6_len = sizeof(struct sockaddr_in6);
  184                 dst->sin6_addr = sin6_dst->sin6_addr;
  185                 if (sc->gif_ro6.ro_rt) {
  186                         RTFREE(sc->gif_ro6.ro_rt);
  187                         sc->gif_ro6.ro_rt = NULL;
  188                 }
  189 #if 0
  190                 sc->gif_if.if_mtu = GIF_MTU;
  191 #endif
  192         }
  193 
  194         if (sc->gif_ro6.ro_rt == NULL) {
  195                 rtalloc((struct route *)&sc->gif_ro6);
  196                 if (sc->gif_ro6.ro_rt == NULL) {
  197                         m_freem(m);
  198                         return ENETUNREACH;
  199                 }
  200 
  201                 /* if it constitutes infinite encapsulation, punt. */
  202                 if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
  203                         m_freem(m);
  204                         return ENETUNREACH;     /*XXX*/
  205                 }
  206 #if 0
  207                 ifp->if_mtu = sc->gif_ro6.ro_rt->rt_ifp->if_mtu
  208                         - sizeof(struct ip6_hdr);
  209 #endif
  210         }
  211         
  212 #ifdef IPV6_MINMTU
  213         /*
  214          * force fragmentation to minimum MTU, to avoid path MTU discovery.
  215          * it is too painful to ask for resend of inner packet, to achieve
  216          * path MTU discovery for encapsulated packets.
  217          */
  218         error = ip6_output(m, 0, &sc->gif_ro6, IPV6_MINMTU, 0, NULL, NULL);
  219 #else
  220         error = ip6_output(m, 0, &sc->gif_ro6, 0, 0, NULL, NULL);
  221 #endif
  222 
  223         if (!(sc->gif_if.if_flags & IFF_LINK0) &&
  224             sc->gif_ro6.ro_rt != NULL) {
  225                 RTFREE(sc->gif_ro6.ro_rt);
  226                 sc->gif_ro6.ro_rt = NULL;
  227         }
  228 
  229         return (error);
  230 }
  231 
  232 int in6_gif_input(mp, offp, proto)
  233         struct mbuf **mp;
  234         int *offp, proto;
  235 {
  236         struct mbuf *m = *mp;
  237         struct ifnet *gifp = NULL;
  238         struct ip6_hdr *ip6;
  239         int af = 0;
  240         u_int32_t otos;
  241 
  242         ip6 = mtod(m, struct ip6_hdr *);
  243 
  244         gifp = (struct ifnet *)encap_getarg(m);
  245 
  246         if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
  247                 m_freem(m);
  248                 ip6stat.ip6s_nogif++;
  249                 return IPPROTO_DONE;
  250         }
  251 
  252         otos = ip6->ip6_flow;
  253         m_adj(m, *offp);
  254 
  255         switch (proto) {
  256 #ifdef INET
  257         case IPPROTO_IPV4:
  258             {
  259                 struct ip *ip;
  260                 u_int8_t otos8;
  261                 af = AF_INET;
  262                 otos8 = (ntohl(otos) >> 20) & 0xff;
  263                 if (m->m_len < sizeof(*ip)) {
  264                         m = m_pullup(m, sizeof(*ip));
  265                         if (!m)
  266                                 return IPPROTO_DONE;
  267                 }
  268                 ip = mtod(m, struct ip *);
  269                 if (gifp->if_flags & IFF_LINK1)
  270                         ip_ecn_egress(ECN_ALLOWED, &otos8, &ip->ip_tos);
  271                 else
  272                         ip_ecn_egress(ECN_NOCARE, &otos8, &ip->ip_tos);
  273                 break;
  274             }
  275 #endif /* INET */
  276 #ifdef INET6
  277         case IPPROTO_IPV6:
  278             {
  279                 struct ip6_hdr *ip6;
  280                 af = AF_INET6;
  281                 if (m->m_len < sizeof(*ip6)) {
  282                         m = m_pullup(m, sizeof(*ip6));
  283                         if (!m)
  284                                 return IPPROTO_DONE;
  285                 }
  286                 ip6 = mtod(m, struct ip6_hdr *);
  287                 if (gifp->if_flags & IFF_LINK1)
  288                         ip6_ecn_egress(ECN_ALLOWED, &otos, &ip6->ip6_flow);
  289                 else
  290                         ip6_ecn_egress(ECN_NOCARE, &otos, &ip6->ip6_flow);
  291                 break;
  292             }
  293 #endif
  294         default:
  295                 ip6stat.ip6s_nogif++;
  296                 m_freem(m);
  297                 return IPPROTO_DONE;
  298         }
  299                 
  300         gif_input(m, af, gifp);
  301         return IPPROTO_DONE;
  302 }
  303 
  304 /*
  305  * validate outer address.
  306  */
  307 static int
  308 gif_validate6(ip6, sc, ifp)
  309         const struct ip6_hdr *ip6;
  310         struct gif_softc *sc;
  311         struct ifnet *ifp;
  312 {
  313         struct sockaddr_in6 *src, *dst;
  314 
  315         src = (struct sockaddr_in6 *)sc->gif_psrc;
  316         dst = (struct sockaddr_in6 *)sc->gif_pdst;
  317 
  318         /*
  319          * Check for address match.  Note that the check is for an incoming
  320          * packet.  We should compare the *source* address in our configuration
  321          * and the *destination* address of the packet, and vice versa.
  322          */
  323         if (!IN6_ARE_ADDR_EQUAL(&src->sin6_addr, &ip6->ip6_dst) ||
  324             !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_src))
  325                 return 0;
  326 
  327         /* martian filters on outer source - done in ip6_input */
  328 
  329         /* ingress filters on outer source */
  330         if ((sc->gif_if.if_flags & IFF_LINK2) == 0 && ifp) {
  331                 struct sockaddr_in6 sin6;
  332                 struct rtentry *rt;
  333 
  334                 bzero(&sin6, sizeof(sin6));
  335                 sin6.sin6_family = AF_INET6;
  336                 sin6.sin6_len = sizeof(struct sockaddr_in6);
  337                 sin6.sin6_addr = ip6->ip6_src;
  338 #ifndef SCOPEDROUTING
  339                 sin6.sin6_scope_id = 0; /* XXX */
  340 #endif
  341 
  342                 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
  343                 if (!rt || rt->rt_ifp != ifp) {
  344 #if 0
  345                         log(LOG_WARNING, "%s: packet from %s dropped "
  346                             "due to ingress filter\n", if_name(&sc->gif_if),
  347                             ip6_sprintf(&sin6.sin6_addr));
  348 #endif
  349                         if (rt)
  350                                 rtfree(rt);
  351                         return 0;
  352                 }
  353                 rtfree(rt);
  354         }
  355 
  356         return 128 * 2;
  357 }
  358 
  359 /*
  360  * we know that we are in IFF_UP, outer address available, and outer family
  361  * matched the physical addr family.  see gif_encapcheck().
  362  * sanity check for arg should have been done in the caller.
  363  */
  364 int
  365 gif_encapcheck6(m, off, proto, arg)
  366         const struct mbuf *m;
  367         int off;
  368         int proto;
  369         void *arg;
  370 {
  371         struct ip6_hdr ip6;
  372         struct gif_softc *sc;
  373         struct ifnet *ifp;
  374 
  375         /* sanity check done in caller */
  376         sc = (struct gif_softc *)arg;
  377 
  378         /* LINTED const cast */
  379         m_copydata((struct mbuf *)m, 0, sizeof(ip6), (caddr_t)&ip6);
  380         ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
  381 
  382         return gif_validate6(&ip6, sc, ifp);
  383 }
  384 
  385 int
  386 in6_gif_attach(sc)
  387         struct gif_softc *sc;
  388 {
  389         sc->encap_cookie6 = encap_attach_func(AF_INET6, -1, gif_encapcheck,
  390             (struct protosw *)&in6_gif_protosw, sc);
  391         if (sc->encap_cookie6 == NULL)
  392                 return EEXIST;
  393         return 0;
  394 }
  395 
  396 int
  397 in6_gif_detach(sc)
  398         struct gif_softc *sc;
  399 {
  400         int error;
  401 
  402         error = encap_detach(sc->encap_cookie6);
  403         if (error == 0)
  404                 sc->encap_cookie6 = NULL;
  405         return error;
  406 }
Cache object: 083af2743522567af665b71f675df7dd
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.
FreeBSD/Linux Kernel Cross Reference sys/netinet6/in6_gif.c

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